Use of ionized fluid during hydraulic fracturing of formation

FIELD: oil and gas industry.

SUBSTANCE: method includes: introducing a fluid containing positively charged ions into at least some of the fractures; provision of said ions to convert shales along cracks into aragonite crystals so that some of the aragonite crystals become suspended in the fluid; removing some of the fluid with the weighted aragonite crystals from said formation. Removal of the aragonite crystals opens or expands the fractures and increases the permeability of the formation by increasing the amount and production rate of hydrocarbons from said formation. The fluid remaining in the mass continues to convert the following calcite crystals along cracks into aragonite crystals, so that aragonite becomes more weighted in the fluid, a certain amount of the weighted aragonite fluid is removed from said formation, thereby further increasing or maintaining the permeability of said formation.

EFFECT: increased hydrocarbon production efficiency.

11 cl, 39 dwg



Same patents:

FIELD: oil and gas industry.

SUBSTANCE: invention is referred to the oil industry and may be used for the stimulation of hydrocarbon production, in particular, of an oil or gas condensate, in wells, increase in their recovery factor due to the treatment of the bottomhole zone of this production formation penetrated by wells included into the formation development. According to the technique, wellhead sealing is performed. Then the well is shut down by the injection of a fluid blocking inflow from the productive formation. At the initial phase an excess pressure is generated in the well so that it exceeds the hydrostatic pressure of the fluid column affecting the productive formation per a preset value. The pressure in the well is increased further with the generation of pulse series of pressure increase in the mode of resonant oscillations with the preset frequency. Then the blocking fluid in the well is replaced by an operating fluid with the simultaneous generation of the pulse series of pressure increase in the well. The operating fluid is flushed to the productive formation at maintaining the pulse impact mode for the productive formation at another frequency differing from the earlier preset frequency until the pressure increases further in the productive formation at the final phase up to a preset value. Thereupon the pressure is decreased sharply in the well by pulse series with the provision of a break in integrity of a hydraulic medium in the productive formation zone. At that time intervals between the pulses in operations with the pressure increase are accepted as different from the time intervals between the pulses in operations with the pressure decrease.

EFFECT: increasing the production rate and reaching an initial value of the bottomhole zone permeability due to opening of a fracture network in the productive formation with prevailing vertical fractures, increasing mass exchange in the filtration zone and reliability of the filtration zone cleanup from products of man-made colmatation.

9 cl, 1 dwg, 1 ex

FIELD: oil and gas industry.

SUBSTANCE: group of inventions relates to oil producing industry and intended for improvement of oil recovery of productive formations. The method of excitement of wave field on the injection well face consists in that the flat constrained flow of liquid is supplied continuously from the slot-hole nozzle to the wedge nose. Meanwhile the area of primary generation of vortex structures in the zone behind the nozzle cut edge is formed. Periodic breakdown of ring vortex structures from the nozzle cut edge, their movement with flow and impact with the wedge nose are provided. Pressure disturbances are generated at deformation and destruction of vortex structures on the wedge nose. Propagation of periodic pressure disturbances from the wedge nose extensively in the form of elastic waves and their chaotic reflection from surrounding walls is performed. The excitation by energy of multiple vortex structures due to energy of elastic oscillations achieving primary generation area is conducted. The liquid flow on the wedge nose is deflected to one of two diverging outlet channels. The flow is divided at the inlet upstream the output channel and sent partially to the lateral chamber interfaced with the nozzle edge and the output channel. In the chamber the pressure is increased due to piston effect of the supplied flow and the flow is pushed away to the opposite output channel, formed from two of its sides by the pressure difference. Periodic switching of the liquid flow direction between output channels is provided. The liquid is displaced alternately from the diverging channels into the common punched output collector. The field of elastic oscillations is excite on the injection well face. Thus the elastic waves reflected from walls of each chamber are focused on the nozzle cut edge interfaced to it.

EFFECT: improvement of efficiency of conversion of kinetic energy of the flow to oscillatory energy of the wave field.

2 cl, 1 dwg

FIELD: oil and gas industry.

SUBSTANCE: group of inventions relates to the field of oil industry and can be used for enhanced oil recovery of the reservoir in the development of water-flooded reservoirs with viscous oil and bitumen at a late stage of development. The method comprises opening the reservoir with the ability to transfer the production well into the injection one, the reservoir processing, keeping the hole without any influence, intake of oil from the reservoir. At that a system of microwave electromagnetic generators with radiation frequency of 2.5 GHz is lowered into the injection well, connected to the slot antenna using the feeder. The length of the slot antenna is selected equal to the thickness of the aquifer of the reservoir. In the mode of injection, the water injection into the reservoir is carried out with simultaneous influence on the reservoir with microwave electromagnetic field, the radiation power is determined by the time of heating of the water injected in the downhole to the desired temperature. When filling 5-10% of the volume of the pore space of the formation, the well is maintained, the well is transferred into the production well, and the liquid intake from the production well is carried out.

EFFECT: increase of the effectiveness and economical efficiency of development of water-flooded reservoirs of high-viscosity oil, intensification of oil production in water-flooded reservoirs of high-viscosity oil by increasing the coverage with influence to the reservoir with heating in the bottomhole area of the reservoir of the production wells.

2 cl, 3 dwg

FIELD: oil and gas industry.

SUBSTANCE: method includes creation of compressive pressure drop between bottomhole zone of stratum and cavity of tubing string by fluid injection, pressure release at motion of fluid from bottomhole zone to day surface, generation of periodic pressure pulses in bottomhole zone of stratum, repetition of pressure release stages and pressure pulse generation stages; control over these stages. Pressure drop is generated by fluid injection into the well at the preset pressure created in the first receiver during injection subperiod, while pressure release up to the preset value is made at opening of control valve during pressure release subperiod through the first receiver. Pressure is controlled against wellhead pressure sensor and bottomhole zone pressure sensor. When maximum flow rate is attained for permanent fluid flow in annular space during injection subperiod, a submersible flow shutoff device is actuated. When maximum pressure is obtained during injection period at bottomhole zone of stratum, the second receiver is switched on.

EFFECT: higher efficiency and stability of the well operation.

2 cl, 3 dwg

FIELD: mining.

SUBSTANCE: according to the method acoustic, electric, mechanical and hydrodynamic compressing and pulling stresses are formed by acting by periodic short impulses by means of explosion of a calibrated conductor placed in a working interval of a well. This energy of explosion is brought to the coal seam. In the well the slot-hole perforation is created which is oriented in the directions of main stresses in the coal seam. An additional slot-hole perforation is formed in permeable rocks containing the coal seam. The direction of additional slot-hole perforation is oriented in the directions of the main stresses of the rocks containing the coal seam. It strengthens acoustic and hydrodynamic cavitation of gas bubbles emitted from coal, fractures, microfractures, pores, micropores, capillaries, microcapillaries of the coal seam. Fractures and microfractures are also formed in the permeable rocks containing the coal seam. It favors to development of mesh of abnormal microfracturing in the coal seam and additional fractures and microfractures in the permeable rocks containing the coal seam. In general all factors provide the maximum desorption and diffusion of methane.

EFFECT: increase of production of coal methane, reduction of energy consumption, improvement of safety and environmental friendliness of the process.

5 dwg

FIELD: oil and gas industry.

SUBSTANCE: well formation development device includes tubing string with a packer installed above the formation and filter blinded from bellow for the purpose of communication with the formation, a bit with a row of holes. The filter is equipped with nozzle on top, with inner cylindrical cavity. The bit is inserted from top to the nozzle from which it is supported by the spring upwards. From bellow the tip is equipped with a saddle and a ball mounted on the saddle. The packer is made as an inflated rubber element with hydraulic chamber connected by axial channel made in the nozzle with its inner cylindrical cavity. At that in initial position the row of bit holes is placed opposite inner cylindrical cavity of the nozzle and communicated to inner surface of the tubing string. At that a hollow body rigidly fixed to the tubing string from the top is installed telescopically at the bit top. The hollow body is fixed in regards to the bit in initial position by a shear tie and in operating position the bit may be moved axially in limited way in regard to the hollow body and nozzle, compression of the spring, fixation of the hollow bit in regard to the nozzle, sealed cut-off of the row of bit holes at the inner head of the nozzle. At that the tubing string above the hollow body is equipped with sucker rod pump.

EFFECT: improved quality of the operation device, improved reliability of sealing.

2 dwg

FIELD: oil and gas industry.

SUBSTANCE: device for pulse injection of liquid into a reservoir includes case, sleeve with central duct, positioned concentrically in the case, and process constriction in the form of removable bushing in the central sleeve duct. The case is installed on the sleeve on ball bearings. The sleeve features top and bottom rows of radial orifices with check valve placed between the orifices inside the sleeve and allowing for a flow upwards from below. Top and bottom rows of radial orifices are interconnected by a bypass duct between the case and the sleeve. The bypass duct features tangential vanes on the inner case surface, ensuring case rotation against the sleeve and partially overlapping and changing flow area of the bottom row of radial sleeve orifices by a ring featuring a row of through orifices. The ring is mounted outside of the sleeve opposite to the bottom row of radial sleeve orifices and is attached rigidly to the case. Removable bushing is installed in the central duct at the lower sleeve end.

EFFECT: higher reliability of operation.

3 dwg

FIELD: oil and gas industry.

SUBSTANCE: method comprises adding of dispersed flow of gas into the liquid flow and mixing of gas with liquid at the joint movement in the pipeline. Gas and liquid are supplied portionally. The obtained gas and liquid system is additionally pumped through the damping section of the pipeline with subsequent dispergating. For this purpose the dampener with the length 2-12 m is used. The flow rate of gas and liquid is set from the condition of their volume ratio 1.25-1.07. The surface-active substance is also used. The gas and liquid system is provided with the size of bubbles 7-12 microns as a cellular system with water between the neighbouring bubbles in membrane state.

EFFECT: improvement of efficiency of generation of steady structured fine gas and liquid mix in conditions of portion supply of liquid and gas.

1 ex

FIELD: mining.

SUBSTANCE: in the process of construction of horizontal well, the deviated hole is drilled through the rocks, descending of the upper casing pipe, cementing the borehole annulus behind the upper casing pipe, drilling the horizontal shaft from the upper casing pipe to the lower oil reservoir, descending of the lower casing pipe with a partial placement of the latter in the lower part of the upper casing pipe, cementing the borehole annulus behind the lower casing pipe, perforation of the horizontal shaft, descending to the upper casing pipe of flow string with a packer with mounting of the packer and the shoe of the flow string in the upper casing pipe over the lower casing pipe, and performing the hydraulic fracturing in the horizontal shaft. As a part of the upper casing pipe in the interval of the upper producing layer the well casing of increased thickness are used, where the packer is placed. During the hydraulic fracturing of the lower oil reservoir the pressure is created over the packer, which is allowed on the upper casing pipe. Then the simultaneous release of pressure above and below the packer is carried out, perforating of the upper casing pipe is carried out in the interval of the upper oil reservoir, and development of the well. The height of the cement sheath between the packer top and the lower oil reservoir is determined from the ratio: LPHFLPOP2, where PHFL is pressure of hydraulic fracturing of the layer, MPa; POP is pressure in the over-packer space in the process of hydraulic fracturing of the layer, MPa; L is the height of the cement sheath between the packer top and the lower oil reservoir, m; 2 is the reliability coefficient of the cement sheath, MPa/m.

EFFECT: elimination of flows in the hydraulic fracturing crack, crushing the production casing above the place of the packer mounting, and reduction of water cut of the excavated product.

1 dwg, 1 ex

FIELD: oil and gas industry.

SUBSTANCE: regulated hydrodynamic wave generator in the producer includes a sucker-rod pump unit and a two-piece piston with centrators placed in the production casing under dynamic level of the oil well fluid at the shank end or at the lower part of the production tubing made as the tubing string. The two-piece piston is made as a bank of elements chocking jets of the oil well fluid in the production casing. The bank is formed of choking elements so that they may be flown around their bodies and their flow passages are narrowed for the oil well fluid. The choking elements are made with sharpened outer edges and flow-around surfaces at least from the side faced towards dynamic level of the oil well fluid with potential narrowing in width of flow passages and speeding-up of the oil well fluid jets in the area of jets breaking from the outer edges of the choking elements.

EFFECT: improved oil recovery due to intensification of filtering processes in the productive stratum and involvement into operation of non-operated or low-operated interlayers in the development element.

5 cl, 4 dwg, 2 tbl, 1 ex

FIELD: oil and gas industry.

SUBSTANCE: dry mixture for makeup of well-killing fluid containing industrial powdered lignin sulphonate, biopolymer of xanthane gum and bone glue with the following ratio of ingredients, wt %: the above lignin sulphonate 86.7-90.0, biopolymer of xanthane gum 9.5-12.5, bone glue 0.5-0.8.

EFFECT: improving impermeable properties of the well-killing fluid made of dry mixture having high stability during storage due to excluded caking and lumping, ensuring potential regulation of density of the well-killing fluid, reducing time and simplifying technology of well-killing fluid makeup of non-critical reagents, reducing time for well development, potential usage of the well-killing fluid at low climatic temperatures, expanding range of reagents, saving transportation costs.

2 cl, 1 tbl

FIELD: agriculture.

SUBSTANCE: method comprises deep loosening of soil, application of fertilizers and ferrous sulphate solution, and watering with increased irrigation rate. At that as the fertilizer the urea formaldehyde fertilizer is applied in the topsoil, which is saturated with ferrous sulphate solution and encrusted with phosphogypsum. After completion of washing the fertilizer is moved to the lower part of the ploughed horizon.

EFFECT: efficient desalination of irrigated saline soils with improvement of soil structure, increase in soil fertility and erosion resistance without damaging the surrounding area and plants.

FIELD: oil and gas industry.

SUBSTANCE: cement slurry contains 46.0-75.0 wt % of binding material and as such portlandcement of packing class G or cement mix Micro TSS BTRUO or a mix of aluminous cement GTS-40 and microcement Micro TSS BTRUO in mass ratio of 3:7, or a mix of aluminous cement GTS-40 and portlandcement PTST 50 in mass ratio of 1:4 is used; 1.0-4.0 wt % of surfactant and as such a mix of emulsifying agent MR-150 is used with calcium alkyl benzosulphonate and emulsifying agent OP-4 in mass ratio of 1:4:9; or a mix of emulsifying agent MR-150 is used with calcium alkyl benzosulphonate, water-repellent agent ABR and Neftenol VKS-N in mass ratio of 4:4:3:3; 9.0-27.0 wt % of diesel fuel; 0.0-0.5 wt % of calcium chloride; 0.0-2.0 wt % of condensed microsilica MK-85 and fresh water - the remaining share.

EFFECT: improved fluidity, reduced water loss, improved strength and durability of cement stone.

2 tbl

FIELD: chemistry.

SUBSTANCE: invention relates to compositions and methods of wellbore processing. A composition for wellbore cleaning contains, wt %: solvent 10-45; cosolvent 10-40; hydrophilisating surface-active substance 5-10; purifying surface-active substance 5-20; non-ionogenic surface-active substance 1-10; non-ionogenic auxiliary surface-active substance 1-5; emulsifying surface-active substance 1-5; water liquid 1-5.

EFFECT: improvement of cement binding in the annulus space between the case pipe and the rock surface.

14 cl, 4 ex, 4 tbl, 2 dwg

FIELD: oil and gas industry.

SUBSTANCE: invention relates to compositions for wells treatment for use in oil industry. Composition for well treatment containing chemical for well treatment adsorbed using water-insoluble adsorbent, where composition is produced by the well treatment chemical deposition from liquid, at that the well treatment chemical is adsorbed on the water-insoluble adsorbent, and where the well treatment chemical is deposited upon metal salt presence. Well treatment liquid containing the above mentioned composition and carrying liquid. Method of the underground reservoir or wellbore treatment including the above mentioned well treatment liquid injection in the reservoir or wellbore. Method to monitor the well treatment chemical release in the wellbore including the above composition injection in the wellbore. Invention is developed in subclaims.

EFFECT: improved efficiency of treatment in environments with high pH.

38 cl, 3 dwg, 4 ex

FIELD: oil and gas industry.

SUBSTANCE: lightweight plugging material contains cement PTsT-I-100, lightweight - expanded vermiculite, technical salt, chemical agent Crep, at the following ratio in wt %: cement PTsT-I-100 - 84.75; vermiculite - 9.42; Crep - 1.13; NaCl - 4.7. During the cement slurry preparation - expanded vermiculite, technical salt.

EFFECT: exclusion of the hydraulic fracture during wells cementation due to improved parameters of the packing cement, increased strength of cement stone at low and moderate temperatures at early stage of solidification upon simultaneous density reduction of the cement slurry.

1 tbl

FIELD: chemistry.

SUBSTANCE: reagent for treating drilling mud contains 94-96 wt % ferrochrome lignosulphonate and 4-6 wt % ammonium polyphosphate.

EFFECT: improved dilution properties of the reagent in salt mud, high thermal stability and environmental safety of the reagent.

3 tbl

FIELD: oil and gas industry.

SUBSTANCE: invention mainly relates to methods of hydrocarbons production from hydrocarbons containing reservoirs. Method of treatment of the reservoir containing crude oil including stages when: (a) composition is supplied to extract the hydrocarbons to at least part of the reservoir, at that the composition contains at least two internal olefin sulphonates selected from group comprising internal C15-18-olefin sulphonates, internal C19-23-olefin sulphonates, internal C20-24-olefin sulphonates and internal C24-28-olefin sulphonates, and at least one viscosity decreasing compound, that is isobutyl alcohol, ethoxylated C2-C12-alhohol, 2-butoxyethyl, butyl ether of diethylene glycol or their mixture, and (b) composition is provided with possibility to react with the reservoir hydrocarbons. Invention also relates to method of viscosity decreasing of composition of highly active surface-active substance and composition for hydrocarbons extraction.

EFFECT: result is creation of more effective method of hydrocarbons extraction from crude oil containing reservoir.

14 cl, 2 dwg, 2 tbl, 2 ex

FIELD: oil and gas industry.

SUBSTANCE: method of acid treatment of bottom-hole zone of carbonate reservoir includes injection of the acid composition containing in wt %: inorganic or organic acid, or their mixture 9.0-24.0; zwitterion surface-active substance - oleinamidopropylbetaine 1.0-10.0; hydrophobically-modified polyurethane polymer 0.05-3.0; water - rest, at that the acid composition is injected by single stage or by portions with holding between injections. The acid composition can additionally contain anionic surface-active substance in amount of 0.1-3.0 wt %. The above specified acid composition is injected alternating with injection of hydrochloric acid at 12-24% concentration.

EFFECT: alignment of profile of inflow of the production wells in carbonate reservoirs with non-uniform permeability, creation of new fluid conducting channels through entire perforated thickness of the reservoir, restoration of reservoir characteristics of bottom-hole zone due to its cleaning of mud solid particles.

3 cl, 1 tbl, 16 ex, 4 dwg

FIELD: oil and gas industry.

SUBSTANCE: method of water production zone isolation in a well involves sequential injection of coagulation agent (25% solution of calcium chloride), buffer layer of fresh water, and Givpan acrylic reagent. Additionally, polyethylene terephthalate production waste product, PET with low polymerisation degree, is added to Givpan as a filler in amount of 18-24 wt %.

EFFECT: reduced core permeability.

1 dwg, 7 tbl, 3 ex

FIELD: production and exploratory well drilling, particularly foaming drilling fluids used during penetration through incompetent rock intervals and during primary productive oil and gas deposit opening in the case of abnormally low formation pressure.

SUBSTANCE: foam composition comprises surfactant, foam stabilizer, water, water hardness control additive and lubricant. The water hardness control additive is sodium silicate. The lubricant is VNIINP-117 emulsion. The foam stabilizer is polyacrylamide, the surfactant is sulphonole. All above components are taken in the following amounts (% by weight): sulphonole - 0.8-1.5, sodium silicate - 0.2-0.5, polyacrylamide - 0.1-0.5, VNIINP-117 - 0.5-2, remainder is water.

EFFECT: reduced power inputs for well drilling, as well as reduced coefficient of friction between drilling tool and well wall.

1 tbl