(E21B43/267)

System of hydraulic fracturing of formation with hydraulic energy transmission system // 2642191
FIELD: mining.SUBSTANCE: system includes a hydraulic energy transmission system configured with the possibility of communicating pressure between a first fluid media and a second fluid media. The hydraulic energy transmission system is made so as to minimize or prevent mixing of the first and second fluid media.EFFECT: enhancement of efficiency of the formation hydraulic fracturing.18 cl, 11 dwg

Use of logging instruments by pulsed neutron capture method to detect proppant near wellbore // 2641047
FIELD: oil and gas industry.SUBSTANCE: methods for identifying the location and height of artificially created fractures of a subterranean formation as well as the presence of any material associated with the packing according to the "frac pack" or gravel packing technique, near the wellbore with the use of logging instruments by the method of pulsed neutron capture are described. The proppant/sand used in hydraulic fracturing and packing processes is marked thermal neutron absorbing material. With the presence of proppant, the increased values of component capture cross-section of formation and/or wellbore in combination with reductions of measured values of metering rate detected by means of logging by the pulsed neutron capture method are used to determine the location of formation fractures as well as the presence and percent filling of packing material in the wellbore region. The changes in measured values of formation capture cross-section relative to changes in other logging parameters of the pulsed neutron capture method provide relative indication of proppant in fractures as compared to proppant in the wellbore region.EFFECT: improved efficiency for determining the location and height of particle packing according to frac pack technology.53 cl, 13 dwg, 6 tbl

ethod for treatment of well with removal by means of material capable of decomposing // 2640618
FIELD: oil and gas industry.SUBSTANCE: method of fracturing and removal with degradable material comprising the steps: injection of wellbore treatment fluid into the well to enter the multi-layer formation and propagate the fracturing in the formation layer, injecting aqueous suspension containing fibers of insoluble material which is capable of decomposing in the solid phase for forming a plug from compacted fibres and isolating the hydraulic fracture from the well, where the decomposed material is present in the suspension at a concentration of at least 4.8 g/l (40 lbs/1000 gallons), and the liquid phase of suspension comprises a polymeric thickener, a viscoelastic surfactant, an auxiliary surfactant, a rheology modifier, a polymeric resistance reducing agent, a drag reducing surfactant, a polymeric resistance reduction enhancer, a monodimensional resistance reduction amplifier, an aqueous brine, or a combination thereof, or a mixture thereof, by means of the plug leading from the previous hydraulic fracturing, injecting the wellbore treatment fluid into the well to propagate the next hydraulic fracturing in another formation layer, and decomposition of decomposable material to remove the plug. The invention has been developed in the dependent claims.EFFECT: increased treatment efficiency.10 cl, 8 ex, 3 tbl, 13 dwg

Proppant with improved bubbles for hydraulic fracturing in wells // 2640614
FIELD: oil and gas industry.SUBSTANCE: method for forming gas-filled bubbles on the surface of proppant particle comprises the steps for placing proppant particles in water at operating pressure of 8000-12000 psi, creating excessive gas pressure in water equal to or greater than the operating pressure of 8000-12000 psi to create saturation around or in the immediate vicinity of proppant particle, in the result the bubbles are formed on surface of proppant particles, and excessive pressure relieves from water to operating pressure level. The invention has been developed in the dependent claims.EFFECT: improved efficiency of hydraulic fracturing.11 cl, 1 dwg

Particles containing one or multiple crosslinked active substances with controlled release // 2639232
FIELD: chemistry.SUBSTANCE: particle of cross-linked substance preventing the formation of deposits for oil production operations, for a cooling tower water source, comprising a substance preventing the formation of deposits and a crosslinking reagent. The substance preventing the formation of deposits is crosslinked with a crosslinking reagent. A method of producing particles according to the present invention. Methods for performing a mechanical fracturing operation to reduce formation of deposits in an oil well and in a cooling column using particles according to the present invention. The invention is developed in the dependent points of the formula.EFFECT: increasing the efficiency of processing by using these particles.41 cl, 35 ex, 13 tbl, 1 dwg

Direct channeling method and system for increasing fracture conductivity // 2638667
FIELD: mining engineering.SUBSTANCE: method for processing an underground formation with a well passed therethrough, and in which the stage composition is pumped for treatment with pressure higher the fracture pressure to generate the fracture in the formation, at that the fluid contains constant concentration of first solid particles and non-constant concentration of anchor material, the first solid particles distributed in the fracture are combined to form spaced-apart clusters in the fracture in order to slow the combination of at least some of the clusters, and the pressure in the fracture is reduced to keep the fracture open on the clusters in order to form hydraulically conducting channels interconnected between the clusters. The method for processing the underground formation with a well passed therethrough, the first solid particles are pumped into the formation at a constant concentration in the formation, at the same time maintaining constant rate and concentration of the first solid particles during the pumping stage of the composition for treatment, there is gradual alternation of the concentration of the anchor material in the composition stage for treatment between a plurality of levels relatively enriched with the anchor material and a plurality of levels depleted by the anchor material in the pumped stage of the composition for treatment. The method for processing the underground formation with a well passed therethrough the treatment composition is pumped into the formation at a constant rate, comprising a thickened carrier with constant concentration of the first solid particles to form a uniform area in the fracture with a constant uniform distribution of the first solid particles, successive alternation of concentration levels of the anchor material in the composition for treatment between the levels enriched with the anchor material, and the levels depleted by the anchor material, in the pumped stage of the composition for treatment in order to form non-uniform areas containing sections enriched with the anchor material and sections depleted by the anchor material in a homogeneous area with a constant uniform distribution of the first solid particles, lowering the viscosity of the carrier in a uniform area to initiate precipitation of the first solid particles prior to fracture closing, in order to form hydraulically conducting channels at least in sections depleted by the anchor material and columns in sections enriched in anchor material; and then provide closing of fracture on columns. Variants of systems for treatment the underground formation with a well passed therethrough according to said methods. The invention is developed in the dependent claims.EFFECT: increased treatment efficiency.29 cl, 1 ex, 13 dwg

Fluids and method including nanocellulose // 2636526
FIELD: oil and gas industry.SUBSTANCE: fluid for treating a subterranean formation containing an aqueous two-phase system comprising a first aqueous phase and a second aqueous phase, wherein the first phase comprises NCC containing nanocrystalline cellulose comprising NCC core particles having a crystal structure, the NCC particle concentration in the first phase is higher than their concentration in the second phase, and the fluid is capable to become more viscous than either the first phase or the second phase, when the aqueous two-phase system passes into a single-phase system. The method for treating the subterranean formation comprises injecting said fluid into the subterranean formation. The fluid for treating the subterranean formation contains a solvent, a composition comprising nanocrystalline cellulose containing rod-shaped NCC particles having a crystalline structure and gas. The fluid is a foamed cement suspension comprising gas in amount of approximately 10 to 80% by volume of the suspension. The invention is developed in subclaims.EFFECT: increase of processing efficiency.27 cl, 6 dwg, 7 tbl
ethod of interval multistage hydraulic fracturing of formation in oil and gas wells // 2634134
FIELD: oil and gas industry.SUBSTANCE: invention relates to methods of developing oil and gas fields by horizontal wells and can be applied to implement the interval multistage hydraulic fracturing of the formation. The method includes interval descent of cumulative perforator with the use of coiled tubing, performing perforation in horizontal sections of production string, cement annulus, rock (production formation), pumping fracturing fluid and proppant into production formation for forming and fixing fractures after hydraulic fracturing, interval installation in horizontal sections of production string of packers. The cumulative perforator with packer is lowered at the first stage of the hydraulic fracturing, and the cumulative perforator with packer is used for preparation of further stages of hydraulic fracturing. In this case, a composite explosive packer-plug is installed in front of the perforator with a seat chamber used as a packer withstanding pressure drop of not less than 700 atm. At that the packer-plug is connected to the perforator by means of a connecting device, and for initiation of the composite explosion packer-plug and the cumulative perforator, a cable-channel (geophysical cable) passed through coiled tubing is used to transmit various encoded electric pulses. At that one pulse initiates powder charge for installation and disconnection of the composite explosion packer-plug from the cumulative perforator, and the other pulse initiates the cumulative perforator. At that the installation of the packer-plug and perforation is performed in one descending-ascending operation.EFFECT: increased processability of the method.5 cl, 21 dwg

Recovery method of high-viscosity oil deposit by steam cyclic effect // 2633930
FIELD: oil and gas industry.SUBSTANCE: invention relates to development of high-viscosity oil deposits with steam cyclic effect containing impermeable interlayers using hydraulic fracturing cracks (HF). The method includes drilling a vertical well in high-viscosity oil deposit, supporting the vertical well with a casing string, casing perforating in the production formation interval, pumping steam and gas carrier through the well into the production formation, lowering the tubing string with a pump, and taking the heated product from the well. A vertical well opens the deposit of high-viscosity oil, represented by the upper and lower parts of the formation separated by an impermeable interlayer. In this case, the casing string is perforated in the well in front of the upper part of the production formation and in the cap of the impermeable interlayer. After that, hydraulic fracturing is performed by pumping 20% hydrochloric acid at a flow rate of 1.5 m3/min at the rate of 2 m3 per 1 m of the formation with the fracturing crack. Then, salt water with density of 1180 kg/m3 is pumped into the fracturing crack in the volume of the injected acid at a flow rate of 0.8 m3/min. Then, the fracturing crack is supported by pumping a crosslinked gel with a proppant mixture at a flow rate of 2.0 m3/min in the following ratio %: proppant fraction 16/20 mesh - 60%; cylindrical proppant of fraction 12/16 mesh - 20%; RCP proppant fraction 16/30 mesh - 20%. After the hydraulic fracturing, the bottom of the production formation is perforated. To reduce heat losses at the beginning of the steam cyclic effect, the well is warmed by steam circulating until the condensate outlet from the return line stops. A pipe string with a bottom-up non-return valve, a lock support of the plug-in rod pump, a lower relief valve, a lower packer, an upper relief valve, and an upper packer is lowered into the well. The pipes string is placed in the well so that the upper packer is opposite the cap of the upper part of the production formation, and the lower packer is opposite the cap of the lower part of the production formation. Then, an insert rod pump is lowered into the pipes string on the rod column, which is fixed in the lock support, then the steam is pumped in a volume of 40 tons per day for 14 days. After that, the well is closed and kept for 14 days for impregnation. Then, the heated high-viscosity oil is taken, after the production rate is reduced to a cost-effective level for this well, the steam injection cycles and the selection of the heated high-viscosity oil are repeated.EFFECT: increase deposit coverage; increase efficiency of steam-thermal effect on the formation; exclude overheating of the upper part of the formation; reduce heat losses along the well bore.2 dwg

Development method of high-viscosity oil or bitumen deposit with application of hydraulic fracturing // 2633887
FIELD: oil and gas industry.SUBSTANCE: invention relates to the development of high-viscosity oil or bitumen deposits containing impermeable interlayers with hydraulic fracturing cracks. The method includes drilling of vertical pressure well and horizontal production well in deposit represented by the upper and lower parts of the production formation, separated by an impermeable interlayer, support of the vertical pressure and horizontal production wells with casing strings, perforation of the casing strings, pumping of heat carrier through the vertical pressure well, and taking products through the horizontal production well. A vertical pressure well with an opening of the impenetrable interlayer is drilled, the casing in the upper and lower parts of the production formation and in the impermeable interlayer is perforated; hydraulic fracturing is performed in the vertical pressure well within the interval of the impermeable interlayer and crack is supported. Then direction of crack propagation in azimuth and height of fracture crack is determined. Then, at least one vertical pressure well is drilled at a distance of 150 m from the first vertical pressure well perpendicular to the direction of crack propagation. The horizontal production well is drilled at a distance of 5 m below the bottom of the vertical pressure wells and perpendicular to the direction of the hydraulic fracturing cracks, the heat carrier is pumped through vertical pressure wells and product is taken through horizontal production well. When the production rate is reduced by 50% from the initial value, interval hydraulic fracturing is performed from horizontal production well intervals between vertical pressure wells with opening of impermeable interlayer with formation of cracks, the fracture cracks are fixed using weighted proppant.EFFECT: increased efficiency and implementation of the method.3 dwg

Selective formation fracturing method // 2630022
FIELD: mining.SUBSTANCE: invention comprises the steps of: (i) providing a pipe including at least two sections, each section comprises annular space insulation means, a selective flow path between the inner tube region and the outer region and the through bore isolation means for selective clogging the pipe through bore; (ii) moving the pipe into the well; (iii) isolating the annular space between the outer region of the pipe and the well to create at least two isolated zones; (iv) selecting any zone for fracturing; (v) remote opening the flow path in the pipe portion corresponding to the selected zone so as to allow the fluid flow between the inner region and the outer region of the pipe; (vi) remote insulating the through bore of the pipe so as to seal the through bore by closing the through bore insulation means in the pipe portion corresponding to the selected zone so as to prevent fluid from flowing along the through bore; and (vii) fracturing at least a part of the formation surrounding the well.EFFECT: increasing the efficiency of fracturing.19 cl, 11 dwg

Trailer with manifold and multiple articulated arm assemblies // 2629182
FIELD: mining.SUBSTANCE: trailer with manifold contains at least one main line having a plurality of outlet connection nozzles and a plurality of articulated arm assemblies, each of which is connected to a corresponding outlet connection nozzle. Each arm assembly comprises a connecting element which includes an inlet port, an outlet port and a third port that is generally opposite to the outlet port and is closed by a removable cork element. Each arm assembly also includes articulated piping assembly which includes the first end that is connected to the inlet port and a stand swivel that connects to the inlet port. When setting up the assembly, the second end of the piping is connected to the pump unit to hydraulically connect the pump unit to the main line.EFFECT: increased reliability of connections of several pump units with the well mouth equipment.36 cl, 21 dwg

Development method of high-viscosity oil or bitumen deposit with application of hydraulic fracture // 2627345
FIELD: oil and gas industry.SUBSTANCE: development method of high viscosity oil or bitumen deposit, using hydraulic fracture (HF) involves drilling the vertical and horizontal wells in the reservoir, represented by the upper and lower parts of the productive reservoir, separated by the impermeable interlayer, cementation of the injection and production horizontal wells with the casing strings, the casing strings perforation, the coolant pumping through the injection well and the selection of products through the production horizontal well. One exploring vertical well is drilled in the deposit with the impermeable interlayer opening and the bottomhole at 3m below the impermeable interlayer. In the exploring vertical well the hydraulic fracturing is performed in the interval of the impermeable interlayer with the formation and cementation of the fracture. Then according to the geophysical methods determine the development direction along the azimuth and the fracture height. Further perpendicular to the fracture development direction at the distance 5 m above the impermeable interlayer one injection horizontal well is drilled without crossing the exploring vertical well, so that the exploring vertical well is in the middle of the horizontal injection well, after that perform the interval fracturing from the injection horizontal well in the direction from the bottomhole to the wellhead with the impermeable interlayer opening, with the formation and cementation of fracture, using the lightweight proppant. After performing the interval fracturing, determine the half-lengths of the fractures, made from the injection horizontal well by geophysical methods. Further below the bottomhole of the exploring vertical well and at the distance of 3 m from the fracture, having the maximum half-length, one production horizontal well is drilled parallel to the injection horizontal well, provide the coolant pumping through the horizontal injection well, and the high-viscosity oil or bitumen is selected through the production horizontal well. After reduction of the production horizontal well recovery rate by 50%, the exploring vertical well is transferred to the injection well and provide the coolant pumping into it.EFFECT: increase of the method implementation efficiency, provision of the uniform and complete development of high-viscosity oil or bitumen reserves from the deposit, increase of the deposit coverage by the thermal action of the coolant, reduction of the operating costs for the method implementation.3 dwg

High-viscosity oil or bitumen recovery method, using hydraulic fractures // 2626845
FIELD: oil and gas industry.SUBSTANCE: high viscosity oil or bitumen recovery method, using the hydraulic fractures involves the drilling of the injection horizontal well over the producing horizontal well towards it in the deposit, represented by the upper and lower parts of the productive reservoir, separated by the fluid-proof collector, fixing by the producing and injection wells casing strings, the casing strings perforation, the coolant injection through the horizontal injection well, the selection of heated products through the producing horizontal well. The injection horizontal well is drilled in the upper part of the productive reservoir in the direction of the main minimum stress σmin, perforate the casing string of the injection horizontal well at the bottom, provide the heating of the perforation interval and perform the hydraulic fracture from it with creation of the first crack, that opens the fluid-proof collector from the top to bottom. To create the first fracture, the fracture fluid is injected with the lightweight proppant at the concentration, providing the development of the first fracture down, the first crack is fixed by pumping the carrier fluid with the proppant, create the hydrodynamic connection between the upper and the lower parts of the productive formation, then the length of the first crack is determined by the geophysical methods. After that at the distance of 3-5 m below the first fracture parallel to the horizontal injection well in the lower part of the productive reservoir, the producing horizontal well is drilled, the casing string of the producing horizontal well is perforated at the bottom, the perforation interval is heated and the fracture is produced from it, creating the second fracture, that opens the fluid-proof collector from the bottom up. To create the second fracture, inject the hydraulic fracturing fluid with the weighted proppant at the concentration, that provides the development of the second fracture up, provide the second fracture fixation by pumping the carrier fluid with proppant and create the hydrodynamic connection between the lower and the upper parts of the productive reservoir, equip the wells with operating equipment. The coolant is injected through the injection horizontal well through the first fracture into the deposit, and the selection of high-viscosity oil or bitumen from the deposit is made through the second fracture along the producing horizontal well.EFFECT: increase of the recovery method efficiency and reliability, increase of the deposit coverage by the heat effect, the uniform and complete recovery of high-viscosity oil or bitumen stocks from the deposit, with simultaneous costs reduction.2 dwg

ethod for determining three-dimensional orientation of hydraulic fractures // 2626502
FIELD: mining engineering.SUBSTANCE: method for determining the three-dimensional orientation of a hydraulic fracture includes formation hydraulic fracturing - Frac with the formation of a hydraulic fracture and determining the three-dimensional orientation of the hydraulic fracture after the Frac. Prior to the Frac in the well in the interval of the formation to be fractured, a geophysical device is lowered on a pipe string, pulsed neutron logging is performed by rotating the pipe string with the geophysical device at an angle of 360°, measuring the neutron-absorbing capacity of the formation rocks. The pipe casing with the geophysical device is removed out of the well. Then, the Frac is done producing and maintaining a hydraulic fracture with a proppant. Moreover, maintaining the fracture, the proppant is pumped in two portions. The first portion to be pumped is the proppant of 4/5 of its total mass, and the second portion is a marked proppant containing 0.4% by weight of gadolinium (Gd64157.25) in 1/5 of the total proppant mass. At the same time the proppant fractions are the same in both portions. Upon completion of fixing fractures, the pressure is released from the well and the bottom hole is washed off the excess marked proppant. The pipe casing with a packer is recovered from the well. A geophysical device on a pipe casing is lowered into the well in the formation interval fixed with a fracture, fixed in the bottom hole area with a marked proppant. Pulsed neutron logging is performed by rotating the pipe string with the geophysical device at an angle of 360,° measuring the neutron-absorbing capacity of the formation rocks and the fracture and the three-dimensional orientation of the hydraulic fracture is determined.EFFECT: simplification of the process of determining the three-dimensional orientation of a hydraulic fracture, improved reliability and efficiency of determining the direction of the three-dimensional orientation of the fracture, reduced duration of the implementation process.6 dwg

ining method for multi-layered inhomogeneous oil reservoir // 2626492
FIELD: mining engineering.SUBSTANCE: method includes drilling of vertical injection wells and of a production well with a horizontal wellbore, identification of pay formations with different permeability separated by impermeable interlayers, fastening casing strings and their perforation, injection of displacement fluid and recovery of well products. One horizontal wellbore is drilled in the pay formation located in the middle of the oil reservoir perpendicular to the direction of the main stress σmax. Then two vertical wellbores are drilled in the horizontal wellbore on the right and left side, drilling in all pay formations. The permeability of each pay formation is determined. The horizontal wellbore of the production well and the vertical wellbores of the injection wells are lined with casing strings. The perforation is done in vertical injection wells opposite each pay formation, and the perforation in the horizontal wellbore of the production well is done depending on the number of pay formations, perforated by the injection wells. Next, in each interval of perforation of the horizontal wellbore of the production well, interval hydraulic fractures are produced with the formation of fractures and their subsequent fixation by a proppant of a fraction corresponding to the permeability of each pay formation. To make a hydraulic fracture, a fracturing fluid with light proppant is injected into the lower pay formation. In order to make a hydraulic fracture within the pay formation where the horizontal wellbore is drilled, a fracturing fluid is injected without proppant. And in order to make a hydraulic fracture in the upper pay formation, a fracturing fluid is injected with a heavy proppant. To maintain hydraulic fractures, a carrying fluid with a 12/18 mesh proppant is pumped into a pay formation with a permeability of 0.01 to 40 mD, and a carrying fluid with a 20/40 mesh proppant is pumped into a pay formation with a permeability of 40 to 100 mD. A carrying fluid with a 40/80 mesh proppant is pumped into a pay formation with a permeability of 100 to 500 mD. Then, a pump is lowered into the horizontal wellbore of the production well, a displacement fluid is pumped through vertical injection wells into pay formations, the pump is started and the products are taken from the horizontal wellbore of the production well.EFFECT: improved reliability of the method implementation.3 dwg

Way of hydraulic seam fracture by means of ultra low mass proppant suspended mixtures and gas streams // 2622573
FIELD: mining engineering.SUBSTANCE: way of hydraulic ground formation fracture is offered. It includes a proppant phase force into a ground formation. This phase comprises a fine-grained intimate foam which contains a higher viscosity aqueous fluid with an ultra-low mass proppant - ULMP which is suspended in the mentioned fluid, and a gaseous medium which makes at least about 85% of the volume concentration of the gaseous medium and aqueous fluid in the fine-grained intimate foam combination, where the bubble diameter is less than or equal to 0.18 mm in at least 70% of fine-grained intimate foam gas volume, and a proppant phase is forced into a ground formation under a pressure that is sufficient for formation and extension of a fracture. A way of hydraulic ground formation fracture comprises phases, where: one injects a proppant phase into a formation, where this phase comprises a fine-grained intimate foam in which at least 70% of bubble gas volume in a fine-grained intimate foam have the diameter that is less than or equal to 0.18 mm. The noted foam is obtained by ULMP suspending in the higher viscosity aqueous fluid and then by the mentioned fluid and gaseous medium combination where the gaseous medium makes at least about 85% of the volume concentration of the gaseous medium and aqueous fluid in the fine-grained intimate foam combination. Then one forms and extends a fracture in a ground formation. There is also a way of hydraulic ground formation fracture where one injects a proppant phase into a fracture and where a proppant phase corresponds to a fine-grained foam that comprises a gaseous medium and a ULMP which carries an apparent gravity that is less than or equal to 2.25 and is suspended in the aqueous-based system with the higher viscosity, where the proppant phase gaseous medium makes more than 90% of a fluid in the proppant phase volume concentration. The invention is developed in the dependent claims.EFFECT: hydraulic fracture efficiency upgrading.26 cl, 2 ex, 1 tbl, 2 dwg
Alkaline persulfate to liquefy process fluid gelled by branched polymer at low temperatures // 2621236
FIELD: chemistry.SUBSTANCE: method to liquefy a fluid having an apparent viscosity of more than 5 cP and used for oil or natural gas production, where the liquid contains a water-soluble branched polysaccharide dissolved in water, selected from the group consisting of xanthan, diutan, and any derivatives thereof, and the method comprises the step of fluid contacting with one or more water-soluble persulfates and one or more strong bases, which is carried out at one or more temperatures less than 100°F (37.8°C). The method of well treatment comprises the following steps: creation of process fluid containing water, one or more branched aforementioned polysaccharides present in the water at a concentration at least sufficient to ensure process fluid viscosity of at least 5 cP, one or more water-soluble persulfates and one or more strong bases, introduction of this fluid into the well and its direction to one part of the well having a design temperature less than 100°F (37.8°C), wherein the step of fluid introduction further comprises injection under a pressure exceeding the subterranean formation fracture pressure. The invention is developed in subclaims.EFFECT: increased processing efficiency at low and very low temperatures.17 cl, 5 tbl
Alkaline persulfate to liquefy process fluid gelled by branched polymer at low temperatures // 2621233
FIELD: chemistry.SUBSTANCE: method to liquefy a fluid having an apparent viscosity of more than 5 cP and used for oil or natural gas production, containing one or more water-soluble synthetic polymers selected from the above group, includesthe step of fluid contacting with one or more water-soluble persulfates and one or more strong bases, which is carried out at one or more temperatures less than 100°F (37.8°C). The method of well treatment comprises the following steps: creation of process fluid containing water, one or more water-soluble synthetic polymers selected from the above group, present in the water at a concentration at least sufficient to ensure process fluid viscosity of at least 5 cP, one or more water-soluble persulfates and one or more strong bases, fluid introduction into the well and its direction to one part of the well having a design temperature less than 100°F (37.8°C). The method of well treatment comprises the following steps: creation of the first process fluid containing water, one or more water-soluble synthetic polymers selected from the above group, present in the water at a concentration at least sufficient to ensure process fluid viscosity of at least 5 cP, creation of the second process fluid containing one or more water-soluble persulfates and one or more strong bases, first process fluid introduction into the well, second process fluid introduction into the well to provide their contact in one part of the well having a design temperature less than 100°F (37.8°C). The invention is developed in subclaims.EFFECT: improved method efficiency at low temperatures.17 cl, 5 tbl

ethod of simultaneous-separate operation of well with hydrofracturing // 2620818
FIELD: mining.SUBSTANCE: method of simultaneous-separate operation of a well with hydrofracturing with the use of a drillable bridge plug with a valve, in wells with two or more productive layers is realized in that the bridge plug is installed above the underlying layer from the treated one by means of a setting tool with a chopper valve with electric drive on a cable or hydraulic setting tool on tubing pipes. After removing the setting tool, the packer is sealed with a throw ball and the upper seams are hydrofractured according to the known technology without shutting down the lower ones and without removing the packer that ensures seam separation and their simultaneous-separate operation. When the well is put into operation, the upper layers are running. If the lower layer has more performance than the upper one, it works by raising the throwing ball. At low productivity of the lower layer, the drillable bridge plug prevents from oil well fluid forcing-through from the upper layers into the lower one.EFFECT: providing the ability to perform work on hydrofracturing of the upper seams without shutting down the lower ones and without removing the packer that ensures seam separation and their simultaneous-separate operation.4 dwg
ethod of use slow release indicators // 2618796
FIELD: mining.SUBSTANCE: group of inventions relates to mining and may be used to hydrofracture a variety of producing intervals of a subterranean formation and quantitatively monitor number of fluids produced in a variety of producing intervals of the subterranean formation. It is possible to monitor fluids produced from the hydrofractured formation by injecting fluid with an indicator into the well for hydrofracturing. The method may be used to monitor produced hydrocarbons and produced water. The indicator may be also used to protect the well against sand during hydrofracturing together with installation of a gravel pack or acid hydrofracturing of the formation. The indicator is a component of a composite where it may be immobilized in a matrix (such as an emulsion) or porous particles, on a carrier, or extruded with a binder into solid particles. The indicator may be slowly released from the composite.EFFECT: improved efficiency of quantitative monitoring of the amount of fluids produced in a variety of hydrofractured producing intervals.32 cl

ethod of hydraulic formation fracturing // 2618545
FIELD: oil and gas industry.SUBSTANCE: method involves carrying out the perforation in the formation interval of the well oriented in the direction of the main maximum stress, lowering the tubing string (TS) with the packer into the well, the packer seating, performing the hydraulic fracturing treatment (HFT) by pumping the hydraulic fracture liquid by means of the TS with the packer through the perforated interval to the production formation with obtaining the fracture and its further fixation in the formation by means of cyclic alternating pumping a carrier liquid with proppant via the tubing string, relieving the pressure in the well, releasing the packer, and extracting the tubing string with the packer from the well. To perform the perforation, a hydromechanical perforator on the tubing string is lowered into the well up to the formation sole interval, the pairs of perforation openings are drilled along the perimeter of the well from the sole to the roof of the formation with offset by an angle of 30° when performing each pair of perforation openings. After the perforation, the tubing string with the perforator is removed from the well, the hydraulic fracturing fluid is represented by gelled oil, the total volume of the gelled oil is determined, and the gelled oil is pumped via the tubing string into the formation interval to form a fracture. The volume of the gelled oil after the fracture formation is used as the carrier fluid during the fracture fixation process. Wherein before the fracture is fixed, the volume of residual gelled oil is divided into two equal parts, and both equal parts of the gelled oil are pumped in five cycles in alternating equal portions of ultralight proppant of a 40/80 mesh fraction, coated with the water-swelling rubber-polymer composition with the concentration of 600 kg/m3, with the glassfill filler in the amount of 1 to 1.8% by the proppant weight, with the stepwise increase by 0.2% in each batch, and equal batches of proppant with the size of 20/40 mesh fraction with the stepwise increase in concentration in each batch by 200 kg/m3, starting from 200 to 800 kg/m3. Wherein as the fifth batch, RSP-proppant fraction of 12/18 mesh concentration of 1000 kg/m3 is pumped.EFFECT: increasing the efficiency of the fracture insulation from associated and plantar water, increasing the fracture conductivity and the reliability of the method implementation, improving the fixation quality of the bottomhole formation zone, reducing the additional costs.5 dwg, 1 tbl

ethod for hydraulic fracturing of productive formation with clay layer and gas-bearing horizon // 2618544
FIELD: oil and gas industry.SUBSTANCE: invention can be applied for the hydraulic fracturing treatment (HFT) of a formation containing a clay layer with a gas-bearing horizon. Method involves carrying out the perforation in the productive formation interval of the well oriented in the direction of the main maximum stress, lowering the tubing string (TS) with the packer to the well, seating the packer, performing the hydraulic fracturing treatment (HFT) by means of pumping the hydraulic fracture liquid via the tubing string with the packer through the perforation interval into the production formation with obtaining the fracture and its further fixation by a propping agent, relieving the pressure in the well, releasing the packer and its extracting with the TS from the well. The oriented perforation is carried out using a hydromechanical perforator with an orienting sub, the HFT process starts with pumping the hydraulic fracturing fluid, which is represented by a crosslinked gel, to create a fracture in the productive formation, after which the fracture formed is developed by pumping linear gel with the density of 1,150 kg/m3 with an ultralight proppant with the density of 1,050 kg/m3 of the 40/80 mesh fraction with the weight of 3 tons with the concentration of 200 kg/m3, then the fracture is fixed by pumping crosslinked gel with the proppant of 20/40 mesh fraction or 12/18 mesh fraction, depending on the permeability of the production formation, in batches with the stepwise increasing of the proppant concentration by 100 kg/m3, starting from 200 kg/m3 up to 900 kg/m3. Wherein the crosslinked gel with the proppant of 20/40 mesh fraction is pumped into the productive formation with the permeability from 0.01 to 100 mD during the fracture fixation, while in the productive formation with the permeability from 100 to 500 mD the crosslinked gel with a proppant of 12/18 mesh fraction is pumped during the fracture fixation.EFFECT: improving the reliability of the fracture creation and development in the presence of a clay layer and a gas-bearing horizon above the production formation, increasing the method efficiency; reducing the hydraulic resistance in the perforation interval, reducing the length and complexity of the technological process of the method implementation.4 dwg

ethod for development of oil deposits by hydraulic fracturing fractures // 2618542
FIELD: oil and gas industry.SUBSTANCE: method involves drilling wells with a horizontal wellbore in an oil deposit, carrying out the hydraulic fracturing in the horizontal wellbore with the formation of hydraulic fracturing fractures that connect the oil and the gas deposits separated by an impenetrable interlayer, and extracting oil from the oil deposit. In the center of the oil deposit, with its opening, a vertical wellbore is drilled, then from the vertical wellbore in the direction parallel to the minimum main stress σmin of the rocks forming the oil deposit, the first horizontal wellbore is drilled, hydraulic fracturing at the bottom of the first horizontal wellbore is carried out to form a fracture, wherein a hydraulic fracturing fluid with a weighted proppant is pumped to form the hydraulic fracturing fracture. After the fracturing fracture from the oil deposit through the impermeable interlayer is formed, the fracture is sealed with the proppant, then the hydraulic fracturing interval in the first horizontal wellbore is isolated from the side of the vertical wellbore, after which the first horizontal wellbore is perforated, then the temporary horizontal insulation is installed at the entrance to the first horizontal wellbore, then the second horizontal wellbore is drilled from the vertical wellbore at an angle of 180° with respect to the first horizontal wellbore and in the direction parallel to the minimum main stress σmin of the rocks forming the oil deposit, and technological operations similar to those in the first horizontal wellbore are carried out, after which the temporary insulation installed at the entrance to the first horizontal wellbore is removed, the well pump is lowered into the vertical wellbore and put into operation; while reducing the pressure in the oil deposit twice, one vertical well is drilled at a distance of 50 m from each bottomhole of the first and the second horizontal wellbores, the oil deposit is opened and an artificial front of oil displacement along the first and the second horizontal wellbores is created by water injection, and the oil residues are collected from the oil deposit.EFFECT: increasing the method implementation effectiveness.4 dwg
Ceramic proppant and its production method // 2615563
FIELD: mining.SUBSTANCE: method for ceramic proppant production, consists of the following steps: a) preparation, including grinding of the raw materials, containing magniferous material and additional materials to obtain a charge, b) charge pelletization to form the grains of proppant precursor, c) calcination of the proppant precursor grains to produce the proppant grains and the step of prelimenary calcination of magniferous material in a reducing atmosphere, which is carried out prior to the step a). The ceramic proppant, prepared by the above method is characterized by containing enstatite from 50 to 80 wt % and magnesioferrite from 4 to 8 wt. %. Treating method of the subsurface includes providing of the above mentioned ceramic proppant, mixing it with the working fluid for the hydraulic fracturing and introducing the resulting mixture into the subsurface. Application of the above mentioned ceramic proppant - for subsurface fracturing. The invention is developed in the formula dependent claims.EFFECT: improved performance characteristics of the proppant.19 cl, 1 tbl, 6 ex

ethod of slickwater fracturing // 2614825
FIELD: mining.SUBSTANCE: present invention relates to a method of hydraulic fracturing a subterranean formation. Method for slickwater hydraulic fracturing, comprising introducing into a wellbore an aqueous fracturing fluid containing polyethylene oxide – PEO, as an agent for reducing friction and non-ionic polymer – NP, and reducing friction of aqueous fluid for hydraulic fracturing, when said fluid pumped into wellbore, where NP protects PEO from shear decomposition and where said fluid is introduced into wellbore at pressure sufficient to create or expand hydraulic fracturing in subterranean formation, and weight ratio of PEO and NP is 1:20 to 20:1, and prevention of shear decomposition PEO due to turbulent flow of said fluid. Method of reducing shear decomposition of PEO while introducing aqueous fluid containing PEO, into wellbore, involving introduction of said fluid additionally containing NP, and reducing friction of said fluid, where NP prevents shear decomposition, and PEO shear force, where NP protects PEO against decomposition, where weight ratio of PEO and NP in said fluid ranges from 20:1 to 1:20 and amount of PEO ranges from 20 ppm to 100 ppm. Method of hydraulic fracturing, including introduction into wellbore an aqueous fluid for hydraulic fracturing and reducing friction of said fluid, where said fluid consists of water, a mixture containing PEO and NP, proppant, an agent which prevents agent swelling, or both filler, and agent preventing swelling, where fluid is introduced at pressure sufficient to create or expand hydraulic fracturing in subterranean formation, and where weight ratio of PEO and NP ranges from approximately 1:5 to approximately 5:1, and prevention of shear decomposition of PEO using NP. Invention is developed in depending points of the formula.EFFECT: higher efficiency of reducing friction.21 cl, 3 dwg, 3 ex

ethod of hydraulic breakdown of formation // 2613682
FIELD: oil and gas industry.SUBSTANCE: invention can be applied for hydraulic fracturing treatment (HFT) in a producing well in the presence of associated and/or bottom water. The method involves performing the perforation in the range of well formation oriented in the direction of the main maximum voltage, landing of tubing string with packer to a well, packer seating, performing HFT by hydraulic fracture liquid injection by the tubing string with packer through perforated interval to the production string with obtaining and further fracture fixation by propping agent, pressure relief in the well. To perform perforation hydromechanical perforator is lowered on tubing string to the well before the footing interval, a pair of perforations are made along the perimeter of the well from the bottom to the top of formation at an angle of 30° off-centre when making each pair of the perforations, after the perforation is made NFT with a perforator is removed from the well and then NFT with parker is lowered into the well and packer is seated at the well, before HFT is performed, volumes of fracturing fluid for the formation of fracture, the elastomer added to the fracturing fluid, proppant for fixing the fracture are sequentially determined, and then HFT is performed. Gelled oil is used as the fracturing fluid, the amount of the gelled oil is divided into two equal portions, the first portion is pumped into the first half of the gelled oil volume and HGT is performed forming a fracture, the second portion is pumped into the second half of the gelled oil volume adding granular water-swellable elastomer to create a water shutoff screen over the entire surface of the fracture from the granular water-swellable elastomer, then the fracture is fixed by injecting liquid carrier of gel crosslinked with proppant at first of fine fraction of 20/40 mesh in an amount of 55-60% by weight of the proppant, then the coarse fraction of 16/20 mesh in an amout of 40-45% of the total proppant weight with stepwise increasing concentration of proppant to 100 kg/m3, from 200 kg/m3 to 1200 kg/m3.EFFECT: elimination ofwater break through the frqaction, increased conductivity of the fraction and reliability of the method, reducing costs by eliminating the participation of the geophysical party, reducing the duration of the HFT technological process.5 dwg

ethod for hydraulic fracturing of formation in horizontal shaft of well // 2613403
FIELD: oil and gas industry.SUBSTANCE: method involves drilling of a horizontal shaft of the well in an oil-saturated part of the productive formation, lowering of the casing column into the horizontal shaft of the well and cementing of the annulus space between the casing column and the rock, performing hydromechanical perforation in all intervals of productive formation, extraction of the pipe string with hydromechanical perforator from the well, lowering of the pipe string with packer and performing interval HFT in the direction from the bottom to the wellhead in each perforated interval of casing column with a consequential abandonment of each interval. After drilling a horizontal shaft of the well, geophysical surveys are carried out and thickness and length of the oil-saturated intervals of the productive formation are determined, a map of oil-saturated intervals of productive formation is built according to the horizontal shaft of the well with an indication of their thicknesses and lengths, then hydromechanical perforation of the casing column is performed in the oil-saturated intervals of the productive formation. Pairs of perforations are made along the perimeter of the casing column in the direction from the bottom to the wellhead, positioned an angle of 180° relative to each other and with offset at an angle of 30° when producing each pair of the perforations. When the thickness of the productive formation oil-saturated interval is under 10 m HFT is performed using an acid gel without crack fixing, when the thickness of the productive formation oil-saturated interval is from 10 to 20 m HFT is performed using the hydrocarbon-based gel with fixing of tension crack by pumping the carrier fluid with proppant of 20/40 mesh fraction and concentration of 800 kg/m3, when the thickness of the productive formation oil-saturated interval is over 20 m HFT is performed using a cross-linked aqueous gel with fixing of tension fracture by pumping the carrier fluid with proppant of 12/18 mesh fraction and concentration of 1200 kg/m3.EFFECT: increased efficiency of hydraulic fracturing, simplified implementation process of hydraulic fracturing, improved reliability of hydraulic fracturing, increased coverage of productive formation with tension cracks.1 tbl, 6 dwg

ethod for improving of hydrodynamic connection of well with productive formation // 2612420
FIELD: mining.SUBSTANCE: method involves conducting formation hydraulic fracturing (FHF) by lowering to the well of a pipe string, installation of a central bolt on the upper end of the pipe string, pumping along the pipe string of a fracture fluid under the open central bolt, enforcing formation fracture pressure to form fractures and fixing of the fracture with a proppant. The pipe string end is provided with a hydraulic jet nozzle, equipped with axially pairwise arranged nozzles with a check-valve at the bottom. The diameter of each nozzle is equal to six diameters of proppant grains, a hydrosandblast perforation is performed additionally in the productive formation interval. Thereafter FHF is performed with a pumping of fracture fluid for 2.0 m3, starting with flow of 0.6 m3 with a stepwise increase of 0.2 m3, a diagram is plotted that shows correlation of the fracture fluid flow from the pressure created on every pumping stage and the rock burst pressure of the productive formation is determined, then fractures are fixed via pumping of proppant with the fluid-carrier, after FHF the central bolt is closed waiting for the pressure to decline. The nozzle drift diameter depends on the burst pressure where the wellhead pressure should be 0.8 of the formation fracture pressure, a gutter capacity is tied with the central bolt with a bleed line, consisting from the well to gutter capacity of pipes, air gauge, tap and a nozzle, after the bleed line is installed the central bolt is periodically opened, the air gauge measures the pressure in the bleed line up to the tap and close the central bolt, when the wellhead pressure achieves 0.8 of the burst pressure, then the tap is opened, the pressure is released through the nozzle to the atmospheric pressure.EFFECT: reducing length and complexity of the FHF, guaranteed production of a fracture in a predetermined direction, improving efficiency of cleaning fractions from the pumped fluid during FHF, improving method reliability.4 dwg, 2 tbl

Formation hydraulicfracturing // 2612418
FIELD: mining.SUBSTANCE: method comprises lowering to the well of pipe strings with a packer, seating of the packer, pumping gelled fluid along the pipe string in the productive formation interval to form a fracture, fixing fracture with pumping of the fluid-carrier with proppant covered with a rubber sheet, carrying out FHF, pressure relief and extracting of the pipe string from the well. Lowering pipe strings with a packer into the well is performed so that the lower end of the pipe string is above the roof of the formation for 1.5 m, total gelled fluid is computed with the following formula: Vg=k⋅HP, where Vg - the total amount of gelled fluid, m3; k=11-12 - transfering coefficient, m3/m, for this case we assume k=11; HP - height of the formation perforation interval, m, the gelled fluid is pumped via the pipe string in the productive formation interval to form a fracture, the remaining amount of the gelled fluid is used as the fluid-carrier for fracture fixing. Thus fracture fixing is performed in two stages, where at the first stage fluid-carrier pumping is performed with proppant 12/18 covered with rubber-polymer composition in the amount of 30% of the total amount of proppant, and at the second stage the fluid-carrier pumping is performed with proppant 20/40 in the amount of 70% of the total amount of proppant filled with glass fiber in an amount of 1.5% of the proppant weight pumped at the second stage, the packer is released and the pipe string with the packer is removed from the well.EFFECT: improving method reliability.2 dwg

Formation hydraulicfracturing // 2612417
FIELD: mining.SUBSTANCE: method involves lowering to a well of a pipe string, pumping of a gelled fluid via the pipe string into the productive formation interval with the formation of fractures, fixing of fractures by pumping of gelled fluid with proppant covered with a rubber sheet. In addition a drill is lowered on the pipe string to the production well to the formation sole, pairs of perforations along the well perimeter are made upwards where each perforations pair is shifted at an angle. After drilling the pipe string with the drill is removed from the well. Then the pipe string with a packer is lowered to the well, the packer is seated in the well, formation hydraulicfracturing is made with pumping of gelled fluid with formation of fractures. Further, a crosslinked hydrocarbon-based gel rim is pumped into the fracture in the amount of 0.2 of the volume of the pumped gelled fluid. Fixing of fractures is performed in two stages. The volume of the remaining gelled fluid is divided into two equal parts, and fixing of the fracture is performed with proppant 20/40 and 12/18, covered with a rubber-polymer composition, in equal shares by weight at both stages. At the first stage the fracture is fixed by pumping the first part of the gelled fluid with proppant 20/40, covered with the rubber-polymer composition, and at the second stage the fracture is fixed with the second part of the gelled fluid with proppant 12/18, covered with the rubber-polymer composition.EFFECT: improvement of the formation hydraulicfracturing efficiency and reliability.1 tbl, 5 dwg

Propping agent particles formed from suspension drops, and method of application // 2609785
FIELD: mining.SUBSTANCE: invention relates to particles of propping agent for underground formation hydraulic fracturing. Propping agent manufacturing method involves making of ceramic raw material suspension, including reagent, containing polysaccharide, characterized by solid phase content of approximately from 25 to 75 wt%, formation of suspension drops by passing suspension via nozzle at its vibration exposure, with passing rate from approximately 0.2 to 3 kg/h, bringing suspension drops into contact with coagulant containing liquid surface, extraction of drops from liquid, drying drops with formation of molded granules and granules sintering in temperature range with formation of propping agent particles. In another version, in propping agent particles production method performing above mentioned production of alumina suspension. In third version in said method performing above mentioned production of kaolin suspension, wherein propping agent particles are characterized by long-term permeability, greater than 85 D, at strain of 10,000 psi and temperature of 250 °F, measured according to ISO 13503-5. Invention is developed in depending points of the formula.EFFECT: technical result is higher strength.37 cl, 12 dwg, 4 tbl

ethod of underground reservoir zone processing and media used therein // 2609040
FIELD: mining.SUBSTANCE: invention relates to drilling and well servicing fluids. Method of underground formation zone processing, opened by drilling well, involves use of oily cross-linking liquid composition containing oily liquid, suspending agent, which is clay or fill-silicate material, surfactant and boron-containing cross-linking agent, wherein oily liquid is hydrocarbon oil with flash point of 70–300 °C and contains 0.1 % of aromatic hydrocarbons maximum weight, selected from benzene, toluene, ethylbenzene and m-, o- and p-xylenes (BTEX) and alkyl substituted benzene components, production of formation treatment liquid consisting of water, gelling agent and oily cross-linking liquid composition, and introduction of said fluid for formation treatment in zone inside drilling well opening underground reservoir, oily cross-linking liquid composition contains from 0 to less than 5 ppb of benzene, from 0 to less than 1,000 ppb of toluene, from 0 to less than 700 ppb of ethylbenzene, and from 0 to less than 10,000 ppb of xylene, and from 0 to less than 1,000 ppb of alkyl substituted benzene components, including C2 and C3-benzenes, determined using EPA SW 8260 test method. Oily cross-linking liquid composition for underground wells servicing, containing: oily liquid representing hydrotreated hydrocarbon, boron-containing cross-linking agent with range of solubility in water from 0.1 kg/m3 to 10 kg/m3 at 22 °C and suspending agent, which is clay or fill-silicate material, where oily cross-linking liquid composition contains from 0 to less than 5 ppb of benzene, from 0 to less than 1,000 ppb of toluene, from 0 to less than 700 ppb of ethylbenzene and from 0 to less than 10,000 ppb of xylene, which are determined using EPA SW 8260 test method. Invention is developed in depending points of the formula.EFFECT: increasing safety at maintaining of used hydrocarbon compositions utility during operation of deposits.24 cl, 1 dwg, 2 tbl, 1 ex
ethod of hydraulic fracturing of underground formation // 2608380
FIELD: mining.SUBSTANCE: invention relates to mining and can be used for hydraulic fracturing an underground formation. To create in wedged cracks stabilized channels of high conductivity into the wellbore, first, pumped is the first hydraulic fracturing liquid not containing proppant particles and then the second hydraulic fracturing liquid, which is a suspension of proppant particles. Second liquid has a yield strength and the ability of solidification, and the ratio of the first liquid viscosity to the second liquid viscosity is not less than 0.1. After that the third hydraulic fracturing liquid is pumped not containing proppant particles, wherein the ratio of the first liquid viscosity to the second liquid viscosity is not less than 0.1, and the ratio of densities of the first and the third liquids varies from 0.8 to 1.2. Performed is repeated pumping into the wellbore the second hydraulic fracturing liquid, after which repeated pumping the third hydraulic fracturing liquid is performed.EFFECT: technical result is improvement of efficiency of an underground formation hydraulic fracturing.8 cl, 4 dwg, 2 tbl

Inhomogeneous distribution of proppant with removable extra-metric filler material in formation hydraulic fracturing // 2608372
FIELD: mining.SUBSTANCE: group of inventions relates to intensification of wells, drilling underground formations, and more specifically to fracturing intensification by means of introduction into hydraulic fracturing of proppant for formation of low resistance zones to hydrocarbon production. According to method performing introduction of well treatment liquid, containing proppant and extra-metric material, through borehole into underground formation fracture. Liquid is introduced with different and variable in pulsed mode proppant concentration in pumping curve. Optimized pumping schedule is based on liquid and formation properties and/or introduction is achieved by varying of pumping rates in pulses. Forming plurality of proppant clusters and degradable extra-metric material in fracture. Proppant is compacted into clusters by degradable extra-metric material. At that, pumping schedule is controlled in real time to ensure required fracture length, supports distribution along fracture and its conductivity. To do so, adjusting pumping duration and rate for proppant suspension pulses. At last stage proppant pumping is carried out without pulses.EFFECT: technical result is increased intensification efficiency.38 cl, 9 dwg

Synthetic proppants and monodisperse proppants and methods for production thereof // 2605977
FIELD: manufacturing technology.SUBSTANCE: invention relates to propping fillers and methods of their production. Described are multiple ceramic proppants, where the fillers are monodispersed with the distribution, which is a distribution of 3-sigma or lower with the total distribution width of 5 % or less of the average particle size, as well as other versions of the said fillers, methods of making those proppants and methods of using the said proppants in extraction of hydrocarbons. Invention is developed in depending points of the formula.EFFECT: higher degree of monodispersity of the propping agent, efficiency of its production, higher efficiency of hydraulic fracturing using the said fillers.165 cl, 38 dwg, 13 tbl, 7 ex

ethod of determining efficiency of formation hydraulic fracturing of well // 2604247
FIELD: oil industry.SUBSTANCE: invention relates to development of oil deposits and can be used for geotechnical activities to increase oil production. Method consists in fact that before FHF preliminary complex geophysical survey of well (GSW) is performed and fluid of different mineral content alternately is pumped into perforation intervals with execution of GSW after each pumping. Then FHF is made with proppant and fluid with different mineral content is pumped again with execution of GSW after each pumping. Then comparative analysis of GSW before and after FHF is made, based on readings of pulsed neutron logging. Geophysical survey of well include gamma-ray logging, thermometry method, location of couplings and pulsed neutron logging.EFFECT: technical result consists in determination of parameters of permeable areas of perforated intervals of well before and after formation hydraulic fracturing, analysis results of which show well productivity.1 cl

Heterogeneous proppant placement in fracture with removable extrametrical material fill // 2603990
FIELD: mining.SUBSTANCE: group of inventions relates to mining and can be used for heterogeneous arrangement of proppant in hydraulic fracturing. Method comprises injecting a first treatment fluid comprising a gas and substantially free of macroscopic particles through a wellbore at a pressure sufficient to initiate a fracture in a subterranean formation; injecting a second treatment fluid comprising proppant and an extrametrical material through wellbore and into fracture, wherein introducing is achieved with varied and pulsed proppant concentrations in a pumping schedule, and forming a plurality of proppant clusters comprising proppant and extrametrical material in fracture. Method includes optimising duration of pumping pulse and concentration of proppant in pumping schedule for increasing conductivity of hydraulic fracturing, wherein extrametrical material is subjected to degradation in subterranean formation. Duration between proppant pumping pulses is less than 60 seconds.EFFECT: high efficiency of heterogeneous placement of proppant.27 cl, 9 dwg
ethod for well intensification, exposing low-permeable formation // 2603986
FIELD: oil and gas industry.SUBSTANCE: invention relates to oil industry and can be used for intensification of well operation, exposing a formation with a low-permeable Domanic reservoir. During well operation intensification, exposing a low-permeable formation, method comprises test pumping of fracturing fluid and packs of fracturing fluid with proppant, correcting fracturing project and main hydraulic fracturing process using fractions of proppant, which include only a fine fraction of size not larger than 30/60 mesh, with final proppant concentration of not more than 250 kg/m3, with final under-flush of mixture in a volume of 0.1-0.5 m3. In low-permeability Domanic reservoirs with absolute permeability of not more than 1 mD, formations are perforated with a perforation system, which creates holes with diameter not less than 20 mm, equipment is used, calculated for surface pressure during treatment of up to 100 MPa, method includes preliminary acid treatment for initiation and etching of fractures in an amount of not less than 2 m3 thickened acid per 1 running m of formation, during main hydraulic fracturing process, proppant concentration is created in range from 100 to 250 kg/m3 with the initial value of concentration of not more than 100 kg/m3. When pumping proppant concentration is increased at a pitch of not more than 30 kg/m3, not exceeding value in final stage of 250 kg/m3 with correction of concentration values depending on growth of wellhead pressure by controlling fluid flow rate, but not exceeding wellhead pressure values of 100 MPa.EFFECT: technical result consists in intensification of well, exposing low-permeable formation with low-permeable Domanic reservoir.1 cl
ethod of hydraulic fracturing in injection well // 2603869
FIELD: oil and gas industry.SUBSTANCE: invention relates to oil industry and can be used for hydraulic fracturing in injection well. During formation hydraulic fracturing in injection well, method includes perforating walls of well in well formation interval, lowering of string with a packer, installation of packer above roof of perforated productive formation, pumping into under-packer zone a gelled fracturing fluid in form of cross-linked or linear gel, creation of hydraulic fracturing pressure in under-packer zone and flushing into formed fracture gelled fracturing fluid with proppant of medium and/or coarse fractions with final proppant concentration not less than 800 kg/m3. Preparation of fracturing fluid is performed with a load of gelling agent with concentration of not more than 3.0 kg/m3 during preparation of cross-linked gel or with a load of not more than 4 kg/m3 during preparation of linear gel, proppant used is acid-proof, and after hydraulic fracturing well is flushed with a solution of surfactant in formation water and solution of surfactant in formation water is pumped into fracture.EFFECT: longer efficiency of hydraulic fracturing.1 cl

ethod of tying geometry of hydraulic fracturing to microseismic events // 2602858
FIELD: mining.SUBSTANCE: group of inventions relates to mining and can be used in hydraulic fracturing of formations. Disclosed is a method of performing hydraulic fracturing at drill site in underground reservoir with a network of cracks and with natural fracturing. Inflow into well is intensified by pumping liquid into network of cracks. Method consists in processing data of drilling platform, including parameters of natural fracture and obtaining measurement results of microseismic events; simulation of hydraulic fractures of network of cracks based on data of drilling platform and determination of geometry of hydraulic fractures; creation of stress field of hydraulic fractures by means of a geomechanical model; determining parameters of shear destruction, including envelopes of destruction zone and state of stress around crack system; locating shear destruction in network of cracks from envelopes of zones of destruction and state of stress, as well as in determination of hydraulic fracture geometry by comparing simulated hydraulic fractures and location of shear destruction with measured microseismic events.EFFECT: technical result is improvement of efficiency of hydraulic fracturing of formations.20 cl, 4 tbl, 44 dwg

Self-suspending proppants for hydraulic fracturing // 2602250
FIELD: chemistry.SUBSTANCE: present invention discloses modified proppants and methods for production thereof. Modified proppant, which comprises a proppant particle substrate and hydrogel coating, wherein said coating includes a hydrogel-forming polymer, has thickness from 0.01 % to 20 % of average diameter of said substrate, hydrogel-forming polymer swells upon contact with water-based fluid to form a hydrogel coating around proppant particle substrate, after hydration and swelling, said coating has thickness from 10 % to 1,000 % of average particle diameter of proppant particle substrate, said hydrogel-forming polymer is cross-linked with provision of improved properties of polymer for water absorption and swelling. Water-based liquid containing water-based liquid carrier and said proppant. Method of fracturing a geological formation involves pumping into said formation said water-based liquid.EFFECT: technical result is improvement of propping systems.17 cl, 10 dwg, 24 tbl, 36 ex

ethod of layer multiple hydraulic fracturing in inclined borehole // 2601881
FIELD: hydraulic engineering.SUBSTANCE: invention relates to methods of hydraulic fracturing in tilting directional and horizontal boreholes of producing formations wells in incompetent rocks. Method involves drilling of tilting directional borehole through oil-saturated interlayers, lowering of the casing string in the well and cementing of annular space between casing string and rock, perforation of the casing string in the borehole in the range of oil-saturated interlayers, performing multiple hydraulic fracturing (MHF) in the borehole in direction from the bottom to the head by pumping the pipes of fracturing fluid via strings and formation of cracks in oil-saturated interlayers from the borehole and their further fixing by proppant. At that, on the borehole head underarm the pipes string is equipped with a hydraulic jet perforator with self-centering nozzles in the direction of the main maximum stress of the mine rock, and upper - it is equipped with the anchor-centralizer, the pipes string is let down in said inclined shaft to the oil-saturated interlayer nearest to the bottom. Casing string hydraulic jet perforation is performed opposite the oil-saturated interlayer in direction of the main maximum stress of the mine rock, without changing the position of the pipes string, MHF is performed through the hydraulic jet perforator with formation of fracture with its further reinforcement by proppant. If at fracture reinforcement by proppant pressure in the shell side is more than 80 % of pressure value of the processed formation interval closure, then in the shell side a fluid priming with flow rate of 0.2-0.4 m3/min is performed by the pump unit. If the pressure in the shell side is less than 80 % of closure pressure, a fluid priming in the shell side is not performed. Multiple MHFs are repeated depending on the number of oil-saturated interlayers, abdomen by inclined directed borehole. At the end of multiple MHF the pipes string is withdrawn with the hydraulic jet perforator and the anchor-centralizer from the well. Thereafter the proppant is washed out from the inclined borehole.EFFECT: technical result consists in production efficiency improvement of separate weakly operating oil-saturated interlayers; improvement of method implementation reliability; simplification and reduction of hydraulic fracturing performance duration.1 cl, 5 dwg

ethod and system for preparation of liquid for hydraulic fractures // 2601632
FIELD: mining.SUBSTANCE: present invention relates to production of propping agent used in production of hydrocarbons. Method of creating a propping agent with particles of required sizes, obtained from sludge extracted from the well for extraction of hydrocarbons subjected to hydraulic fracturing, which contains the following stages: separation of water from sludge to form a stream of moist solid particles and liquid flow, mixing of the wet flow of solid particles with solid particles with formation of loaded material, melting of loaded material to obtain the material of fused proppant, abrupt cooling of the melted material, crushing of cooled material of proppant sorting of particles of crushed material by size and mixing of crushed material particles, not corresponding to specified size, with the loaded material. System for creation of propping agent with particles of required size, obtained from sludge extracted from the well for extraction of hydrocarbons subjected to hydraulic fracturing, containing elements: means of water separation from sludge, means for mixing of flow of wet solid particles with solid particles, means for melting of loaded material, means for abrupt cooling of melted material, means for crushing of cooled material, means for sorting of crushed material to obtain particles of the required size, and means for mixing of crushed material, the size of particles of which does not correspond to the required one, with the loaded material. System for use when performing operations of hydraulic fracturing, containing: first separator, having a nozzle for intake of sludge and a nozzle for discharge of sludge with the first water content, second separator containing a nozzle for intake of sludge arranged so that it can receive the sludge from the sludge discharge nozzle of the first separator, and a nozzle for discharge of a flow of wet solid particles with the second, lower water content, furnace for production of melted proppant, which is located so that it can enter the receive sludge from the nozzle for discharge of a flow of wet solid particles from the second separator, and equipped with a discharge opening, cooler located so that it can receive a fused propping agent from the furnace, crusher arranged so that it can receive cooled propping agent from the cooler, mill located so that it can receive crushed propping agent from the crusher, first screen arranged so that it can receive crushed material from the mill, and the second screen arranged so that it can receive material which passed through the first screen. Invention is developed in subclaims.EFFECT: provision of public safety during hydraulic fracturing of formations.29 cl, 10 dwg

Composites for controlled release of well treatment agents // 2600116
FIELD: mining.SUBSTANCE: invention relates to treatment of wells using reagents. Well treatment composite comprising a well treatment agent and calcined porous metal, where porosity and permeability of calcined porous metal oxide is such that well treatment agent is adsorbed into interstitial spaces of porous metal oxide, and further: area of surface of calcined porous metal oxide ranges from about 1 m2/g to about 10 m2/g, particle diameter 0.13 mm and pore volume of said metal oxide from 0.01 to 0.10 cm3/g. In another version well treatment composite, introduced into an underground formation, contains a well treatment reagent and calcined porous metal oxide, where porosity and permeability of said oxide is such that said reagent is absorbed in interstitial spaces of porous aluminium oxide, and reagent is capable of being absorbed at constant rate for a long period of time in formation fluid medium contained in an underground formation. Proppant containing said last composite, where no more than 15 % of proppant is crushed at closure stress of 10,000 pounds per square inch (68.95 MPa), when composite contains 10 wt% of well treatment reagent. Method for treatment of underground formation, permeated with well shaft involves pumping to borehole well treatment fluid containing said composite. Method for stimulation of underground formation involves pumping into formation a well treatment fluid containing said composite. Method for treatment of underground formation involves introduction into underground formation or well bore, penetrating through underground formation, said composite. Method of inhibiting or controlling speed of release of well treatment agent in underground formation or in well bore by introducing into formation or well bore said composite, which after a single treatment has duration of at least six months. Method of limiting inflow of sand in well bore, penetrating through underground formation, involving: introduction into well bore suspension of said composite and fluid carrier, placing composite near underground formation to form a permeable fluid medium seal, which can reduce or almost prevent passage of formation particles from an underground formation into well bore with simultaneous free passage of formation fluids from underground formation into well bore. Invention is developed in depending points of the formula.EFFECT: high efficiency of processing.27 cl, 9 ex, 5 tbl, 6 dwg
Deformable proppant with interpenetrating polymer mesh // 2598956
FIELD: technological processes.SUBSTANCE: present invention relates to deformable proppants and methods of processing underground formation using them. Proposed method involves injection into underground reservoir fluid composition which contains fluid and deformable proppant with interpenetrating polymer mesh formed from first polymer component and second polymer component.EFFECT: high efficiency of processing.10 cl, 6 tbl, 3 ex

High-permeability propping agent for hydraulic fracturing // 2594029
FIELD: mining. SUBSTANCE: invention relates to production of high-permeability filling of proppant in hydraulic fracturing. Method of increasing permeability of filling of a proppant inside the rupture, which includes: feeding into at least part of the rupture in an underground formation of a mixture of a plurality of proppants and multiple particles to form a proppant filling, where at least a part of the particles are collapsible particles, wherein the part of the collapsible particles comprises collapsible metal in the form of a pressed product of relatively less collapsible powders, where the said pressed product is relatively more collapsible, and destruction of at least a part of the particles to create a proppant filling, having a relatively higher permeability as compared with permeability of the proppant filling before destruction. Mixture containing multiple proppants and a plurality of particles, where at least part of the particles is composed of collapsible metal in the form of pressed product of relatively less collapsible powders, where the said pressed product is relatively more breakable. Invention is developed in depending points of the formula. EFFECT: higher efficiency of processing. 26 cl, 8 dwg

ethod of hydraulic fracturing // 2592582
FIELD: mining. SUBSTANCE: invention relates to methods of hydraulic fracturing. Method involves drilling of formation of vertical well, in lowering string up to interval of formation and performance of hydraulic fracturing - HF by pumping fracturing fluid through pipe string. At wellhead lower end of pipe string is equipped with a slot perforator with check valve at bottom and is run in to interval of formation. Method includes reverse washing in one and a half times well volume. Then by means of the slot perforator with orientation on azimuth of maximum stress and flow column, are created in range of sole and bed roof at two opposite slots with diameter up to 1.5 m and height of slot 0.2-0.25 well diameter. After that, in formation between slots through slit perforator by pumping of fracturing fluid through pipe string is performed hydraulic fracturing with formation of fractures. After formation of fractures method includes reinforcing fractures with ultra-light proppant with density 1,200-1,250 kg/m3. Pumping of fracturing fluid through pipe string through slot perforator is continued and simultaneously in annular space of well, pumping of proppant ultra-light under pressure not exceeding permitted on well walls. After fixation of fractures of pipe string with a slot perforator and check valve is removed from well. EFFECT: higher quality of payout bed secondary exposure and broader technological capabilities of implementation of method. 1 cl, 3 dwg

Orientation method of hydraulic fracturing cracks in underground formation, developed by horizontal shafts // 2591999
FIELD: mining. SUBSTANCE: invention can be used in hydraulic fracturing of formation. To provide controlled initiation and propagation of cracks of hydraulic fracturing, the first hydraulic fracturing liquid is pumped into the first horizontal bore communicating with the formation at least in one selected segment, and first hydraulic fracturing fluid is pressurised in the bore to create in the first borehole a mechanical stress field around every selected segment of the first bore. Second hydraulic fracturing fluid under pressure, containing particles of proppant is simultaneously pumped into the second horizontal bore, located at some distance vertically from the first bore and communicating with the formation in at least one selected segment to allow propagation of cracks from the selected segments of the second bore in th direction to selected segments of the first bore. EFFECT: higher productivity of the mined formation and accuracy of cracks location. 7 cl, 2 dwg

System and method for performing operations for stimulation of resources // 2591857
FIELD: mining.SUBSTANCE: system and method for performing operations on hydraulic fracturing of formation in well shaft, boring underground formation. Method involves receiving integrated data of drilling platform, creation of a model of mechanical properties of geologic environment using integrated data of drilling platform, simulation of intersection of natural fracture artificially created hydraulic break, using model of mechanical properties of geologic environment, determining properties of intersections encountered natural fractures. Method may also generate a stimulation plan, using model of mechanical properties of geologic environment and properties of intersections. Stimulation plan may include viscosity or consumption of fracture medium.EFFECT: technical result is improved efficiency of subsurface stimulation.23 cl, 22 dwg
 
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