Well operation stimulation

FIELD: oil and gas industry.

SUBSTANCE: in the method of well operation stimulation including test injection of breakdown fluid and package of breakdown fluid with proppant, correction of the breakdown project and performance of fracturing in low-permeable reservoirs having absolute permeability less than 1mD, hydraulic fracturing is made with injection of flush fluid on the basis of 1.0-3.0 m3 per 1 t of proppant using proppant fractions, which include only fine fraction with size less than 30/60 mesh with final concentration of proppant less than 300 kg/m3; at injection of the fluid flow rate of 3.5 m3/min and more and concentration of gel formation is set less than 2 kg/m3, with final underflush of the mixture in volume of 0.1-0.5 m3.

EFFECT: simulation of the well opening the low-permeable formation.

3 ex

 

The invention relates to the oil industry and can be used with the intensification of the well operation, which revealed the formation with low-permeability reservoir.

There is a method of hydraulic fracturing, in which pre-produce technical analysis water testing gelling on the solubility and structure formation, when a satisfactory result is dissolved gelling in water and re-test structure, with satisfactory results in the solution of gelling in water add stabilizer clays, the demulsifier and the control of destruction, pumped into the well the resulting solution and in the process of injection solution is injected, the destructor and the stapler, thereby forming the liquid gap filling replace the volume of the well to the fluid gap, stop the injection and record the decrease of pressure, resume pumping of fracturing fluid with a work flow on hydraulic fracturing, download "cushion" of fracturing fluid in an amount of from 3 to 6 m3then perform the download trial pack of fracturing fluid with proppant weight up to 1 ton with a concentration of from 30 to 200 kg/m3, bring it to the perforated interval, mark the initial wellhead pressure and then register the nature of its changes in the process of passing the bundle through the perforation interval and its movement is on crack the stack push fluid gap without proppant in the amount of 1.5-1.8 m3produce a displacement of fracturing fluid in an amount equal to the volume of the column tubing, podvecerni zone up to the roof of the perforation interval and another 2-4 m3, stop the displacement and write recession pressure, write and treatment intensity reduction wellhead pressure, the obtained data is processed, receive data about the effectiveness of fracturing fluid, the pressure value, the voltage gradient in the reservoir, the time and pressure of clamping cracks, pore pressure in the reservoir, the hydraulic pressure losses in the perforated interval and the bottom of the reservoir, on the basis of the received data to produce the adaptation of the design data, process of hydraulic fracturing to the received data processing the test injection, the correction data is used to re-calculate the three-dimensional models of fracture and conduct an updated version of the frac change the original plan for the main process of hydraulic fracturing by replacing the original data mining and geological factors on the program after the process of the test injection, spend the amended basic process of hydraulic fracturing, when conducting the modified main process of hydraulic fracturing on the basis of the produced p the accounts produce a set of necessary volume of process water and cooking gel testing, upon satisfactory test results, the process of hydraulic fracturing is carried out in accordance with the modified plan, where the amount of the final produce defined as the sum of the volume of the column tubing and podvecerni zone to the top of the perforated interval, the detection of growth wellhead pressure during injection trial packs of fracturing fluid with proppant in size from 1 to 2.5 MPa increase the volume of the injected proppant small and medium fraction 20/40, 16/30 and 16/20 mesh at minimum concentrations of from 30 to 120 kg/m3up to 800-1000 kg on stage, the efficiency of this measure assess to reduce wellhead pressure by passing this pack of proppant through the perforations and by reducing the pressure to 1 MPa conclude that hydraulic communication with the reservoir and improved the process of hydraulic fracturing should be performed according to the planned parameters according to the revised plan, in the absence of signs of recovery in connection with the formation of the concentration of proppant in the following stages lower, limited to maximum values of up to 350-400 kg/m3injection propane-gel mixture execute two portions, the first portion of the dosage destructor carried out according to the concentration, which provides a complete decomposition of the gel, and the time of closing cracks of not less than 12 hours, the second portion of the dosage des is rector carried out according to the concentration ensuring the process is complete decomposition of the gel, and the time of closing cracks not more than 4 hours after injection propane-gel mixture pumps stop and record the decrease of pressure for more information about the quality of the process of hydraulic fracturing, the intensity of the decrease of pressure, the presence of residual communication with the reservoir, the absence of the effect of preproduce, after which the wellhead is closed, the hole is left for the expectations of decrease of pressure, after the necessary time for the destruction of the gel to produce the etching residual wellhead pressure to atmospheric, the beginning of the bleed excess pressure is produced after 4 hours, at pressures above 4 MPa wellhead gauge drain produced with a flow rate of 30 l/min to atmospheric, and at a pressure of less than 4 MPa wellhead gauge drain produce a full opening of the wellhead valves, wellhead lasermedizin produce failure of the packer and the rise of underground equipment (RF Patent No. 2453694, publ. 20.06.2012).

The closest to the proposed invention the technical essence is a method of hydraulic fracturing, according to which pre-produce technical analysis water testing gelling on the solubility and structure formation, when a satisfactory cut is ltate dissolve the gel in water and re-test structure, if satisfactory results in the solution of gelling in water add stabilizer clays, the demulsifier and the control of destruction, pumped into the well the resulting solution and in the process of injection solution is injected, the destructor and the stapler, thereby forming the liquid gap filling replace the volume of the well to the fluid gap, stop the injection and record the pressure decline, resume the injection of fracturing fluid with a work flow on hydraulic fracturing, download "cushion" of fracturing fluid in an amount of from 3 to 6 m3then perform the download trial pack of fracturing fluid with proppant weight up to 1 ton with a concentration of from 30 to 200 kg/m3, bring it to the perforated interval, mark the initial wellhead pressure and then register the nature of its changes in the process of passing the bundle through the perforation interval and the movement of her crack, the stack pushes the fluid gap without proppant in the amount of 1.5-1.8 m3produce a displacement of fracturing fluid in an amount equal to the volume of the column tubing, podvecerni zone up to the roof of the perforation interval and another 2-4 m3, stop the displacement and write recession pressure, write and treatment intensity reduction wellhead pressure, the obtained data is processed, receive data on the effectiveness of the work is s frac fluid, the pressure value, the voltage gradient in the reservoir, the time and pressure of clamping cracks, pore pressure in the reservoir, the hydraulic pressure losses in the perforated interval and the bottom of the reservoir, on the basis of the received data to produce the adaptation of the design data, process of hydraulic fracturing to the received data processing the test injection, the correction data is used to re-calculate the three-dimensional models of fracture and conduct an updated version of the fracturing change the original plan for the main process of hydraulic fracturing by replacing the original data mining and geological factors on the program after the process of the test injection, spend the amended basic process of hydraulic fracturing, when conducting the modified main process of hydraulic fracturing on the basis of calculations produce a set of necessary volume of process water and cooking gel testing, satisfactory test results, the process of hydraulic fracturing is carried out in accordance with the modified plan, where the amount of the final produce defined as the sum of the volume of the column tubing and podvecerni zone to the top of the perforated interval, the injection propane-gel mixture execute two portions, the first portion sets the end is the acidity of proppant to 300 kg/m 3the dosage destructor carried out according to the concentration, which provides a complete decomposition of the gel and the time of closing cracks of not less than 12 hours, a second portion set the proppant concentration in excess of 300 kg/m3the dosage destructor carried out according to the concentration, which provides a complete decomposition of the gel and the time of closing cracks not more than 4 hours, at the end of produce proppant-gel mixture pumps stop and record the decrease of pressure for more information about the quality of the process of hydraulic fracturing, the intensity of the decrease of pressure, the presence of residual communication with the reservoir, the absence of the effect of preproduce, after which the wellhead is closed, the equipment is removed and the well is left for expectations of decrease of pressure, after the necessary time for the destruction of the gel to produce the etching residual wellhead pressure to atmospheric, start bleed excess pressure is produced after 4 hours, at a pressure of more than 4 MPa wellhead gauge drain produced with a flow rate of 30 l/min to atmospheric, and at a pressure of less than 4 MPa wellhead gauge drain is a full opening of the wellhead valves, wellhead lasermedizin produce failure of the packer and the rise of underground equipment is based (RF Patent №2453695, publ. 20.06.2012 - prototype).

A disadvantage of known methods is that the methods are successfully and effectively applicable at break high permeability and sredneprotsentnyh layers, while in low-permeability reservoirs for the hydraulic fracturing was not provided with sufficient productivity after treatment. This may be a limiting factor for increasing the productivity of wells, so that the efficiency of hydraulic fracturing becomes low.

In the proposed invention solves the problem of intensification of wells that discover low-permeability layer.

The task is solved in that in the method of intensifying the work of wells, including test pumping of fracturing fluid and a pack of fracturing fluid with proppant, the adjustment of the draft gap and carrying out the basic process of the gap according to the invention in low-permeability reservoirs, with an absolute permeability of not more than 1 MD, conduct basic process of hydraulic fracturing injection buffer fluid based 1,0-3,0 m31 ton of proppant, using fractions of proppant, comprising only a small fraction of dimension larger than 30/60 mesh with the ultimate proppant concentration is not more than 300 kg/m3when pumping support a flow rate of 3.5 m3/min or more, and the concentration of the gelling set n is more than 2 kg/m 3with the end not toproduce mixture in an amount of 0.1-0.5 m3.

The invention

According to the proposed method candidates for hydraulic fracturing are permeable reservoir absolute permeability of not more than 1 MD. When conducting a standard fracturing in the reservoir is formed the channel of medium length and relatively high conductivity. The contrast in permeability between the reservoir and separated by a crack is the determining factor. In the medium - and high-permeability reservoirs, the development of crack width with the creation of high end concentration of proppant packs of 300 kg/m3and more can increase the productivity of the well. However, in low permeable formations lack the crack length is a limiting factor for increasing the productivity of wells, thereby not produced the full potential of low-permeability reservoir.

In the proposed invention solves the problem of intensification of wells that discover low-permeability layer. The problem is solved as follows. Typically, the fracturing is performed with the use of proppant three fractions: 20/40 mesh - 10-20%, 16/20 mesh 60-80%, 12/18 mesh - 10-20%. Fraction of proppant 16/20 mesh is primary in relation to the entire volume of proppant, larger (12/18 mesh and larger) and therefore more held at the end of the article the Hai takes up less space the result is a generated crack with a low length, typically no more than 100 m (one wing), with a high conductivity in the vicinity of the part. However, in low-permeability reservoirs do not require a high concentration of proppant packs, and the main condition for improving productivity is the predominant development of cracks in length (from 100 m and more). Finally, the use of modes and calculations in the design of hydraulic fracturing for standard collectors will not allow to increase the productivity of wells with low-permeability reservoirs.

For the more effective carrying out of hydraulic fracturing with a permeability of no more than 1 MD are encouraged to apply the proppant only a small fraction - 30/60 mesh or less. Conducting hydraulic fracturing should be carried out with injection buffer fluid ("cushions") of 1.0-3.0 m31 ton of proppant, using fractions of proppant, comprising only a small fraction of dimension larger than 30/60 mesh with the ultimate proppant concentration is not more than 300 kg/m3when pumping support a flow rate of 3.5 m3/min or more, and the concentration of the gelling establish not more than 2 kg/m3with a final nedoprodal mixture in an amount of 0.1-0.5 m3.

The use of low concentrations of proppant no more than 300 kg/m3due to the necessity of preemptive time the development of cracks to increase well productivity in contrast to the hydraulic fracturing standard headers.

To avoid precipitation of proppant due to the low viscosity of the liquid break flow rate is maintained at the level not less than 3.5 m3/min

The proposed method allows to limit the development of crack width at the same time maximizing the development of cracks in length, thereby allowing you to maximize well productivity. Created and fixed the crack of the proposed method can significantly increase the productivity of low-permeability layers, to create long channels to maximize the potential of the well.

Specific example

Example 1. Spend intensification of work of the oil wells.

Objects intensification: clay-carbonate reservoir at intervals 1663,5-1665,7 m, 1675,7-1676,9 m, the layers are separated between a clay jumper thickness of 10 m, distance to water-saturated formation is more than 20 M.

Lithology of interest: the top formation - argillaceous carbonates (absolute permeability of 0.014 MD, phase 0,07 MD, porosity of 7.4%, clay content of 2.5%); the lower stratum of argillaceous carbonates (absolute permeability of 0.014 MD, phase 0,12 MD, porosity of 14.7%, clay content of 3.8%).

Well design and deflated equipment: production column with a diameter of 168 mm sealed.

Down the tubing, hold the landfilling of bottom is askanim bridge to a depth of 1682 m

Lower packer on the tubing pipes with a diameter of 89 mm depth 1550,5 m and produce planting packer.

Conduct a test injection. The initial acceleration of the object frac Q-288 m3/day, initial pressure Rnac=11 MPa, ultimate pressure Rcon=11 MPa. Perform the determination of the quality of communication with the reservoir by injection of 5 m3the fluid density of 1.10 g/cm3without pre-saturation of the bottomhole zone.

Fracturing produce sampling industrial water and their analysis on the content of mechanical impurities, the content of free hydrogen ions and temperature, produce test preparation frac fluid, run the test on budbreak and the stitching. The results are satisfactory. Prepare the gel volume 27 m3on the basis of gel-WG 46 "Economic". Rheology - the temperature is 27°C, viscosity 21 JV, time knitting 4 sec. Produce adding to the gel demulsifier, activator destruction and clay stabilizer, the mixture is brought to a homogeneous state with stirring, to produce the starting and warming-up injection pumps.

Produce a test injection with a record recession, pressure and processing of data obtained from the decay of the pressure - volume 27 m3frac fluid with the addition of 1000 kg proppant faction 30/60 mesh. Trial pack passed the perforation interval with increasing pressure is of 37 MPa to 39.5 MPa. The obtained data is processed, receive data about the effectiveness of fracturing fluid, the net value of the pressure, the voltage gradient in the reservoir, the time and pressure of clamping cracks, pore pressure in the reservoir, the hydraulic pressure losses in the perforated interval and the bottom of the reservoir. Based on these results, adjust the design process data frac to the received data processing test injection.

Carry out the basic process of hydraulic fracturing.

The correction data is used to re-calculate the three-dimensional models of fracture and refinement of the plan to hydrofracturing. On the basis of 7 these calculations produce a set of necessary volume of process fluid and the preparation of fracturing fluid loading of the gel-2 kg/m3. The test results are satisfactory.

Carry out the basic process of hydraulic fracturing injection buffer fluid ("cushions") in the amount of 13 m3with subsequent injection of only a small fraction of proppant dimension 30/60 mesh with the final concentration of proppant 300 kg/m3. The total amount of proppant is 13 so the Flow of the buffer fluid is 1.0 m31 ton of proppant. The average worker flow rate is 3.5 m3/min when the pressure at the wellhead 47 MPa.

The amount of the final selling the Cai is defined as the sum of the volume of the column tubing and podvecerni zone to the top of the perforated interval minus the amount calculated nedopodacha. Volume nedopodacha was 0.1 m3. At the end of produce proppant-gel mixture pumps stop and write recession pressure, after which the wellhead is closed, the equipment is removed and the well is left for expectations of decrease of pressure. After the necessary time for the destruction of the gel to produce the etching residual wellhead pressure to atmospheric. Start bleed excess pressure is produced at the end of 12 hours. The wellhead lasermedizin produce breakdown and the rise of packer equipment.

Example 2. Perform as example 1.

Carry out the basic process of hydraulic fracturing injection buffer fluid "cushion" in volume 18 m3with the use of proppant dimension 40/70 mesh. Preparation of fracturing fluid is carried out by loading the gel-1.8 kg/m3with a final concentration of proppant 200 kg/m3. The total amount of proppant is 12 so the Flow of the buffer liquid is 1.5 m31 ton of proppant. The flow rate is 4.0 m3/min when the pressure at the wellhead 44 MPa, the volume of nedopodacha 0.3 m3.

Example 3. Perform as example 1.

Carry out the basic process of hydraulic fracturing injection buffer fluid cushion in the amount of 30 m3with the use of proppant dimension 30/60 mesh with the final concentration is the situation of proppant 100 kg/m 3when pumping support a flow rate of 5 m3/min and the concentration of the gelling establish not more than 1.7 kg/m3with a final nedoprodal mixture in a volume of 0.5 m3. The total amount of proppant is 10 so the Flow of the buffer fluid is 3.0 m31 ton of sand.

According to the results of processing results, record manifold pressure done process, the following data: the length of the crack created (one wing) - 117,25 m; fixed - 117,07 m; the height of the crack created 25.5 m; fixed - 18,5 m crack Width after removal of the pressure reservoir of 1.06 mm, maximum

crack width at the perforation interval of 11.1 mm; conductivity cracks 159,78 MJ/m

Producing wells put into operation within 10 days after completion of hydraulic fracturing. Factor productivity grew by more than 3 times. The flow rate of the well was increased from 0.2 m3/day to 6.3 m3/day without increasing watercut. The average increase of oil amounted to 5 tonnes.

Factor productivity at the production wells where hydraulic fracturing is performed according to the classic technology, grew by only 1.8 times. The flow rate of the fluid increased from 2 m3/day up to 4 m3/day, duration of effect was less than 1 year. The reason of low efficiency of fracturing according to the classic technology give the axis the creation of insufficient length cracks, not allowing a significant increase productivity of the well.

The application of the proposed method will solve the problem of intensification of wells that discover low-permeability layer.

Intensification method works well, including test pumping of fracturing fluid and a pack of fracturing fluid with proppant, the adjustment of the draft gap and carrying out the basic process gap, characterized in that in low-permeability reservoirs, with an absolute permeability of not more than 1 MD, conduct basic process of hydraulic fracturing injection buffer fluid based 1,0-3,0 m31 ton of proppant, using fractions of proppant, comprising only a small fraction of dimension larger than 30/60 mesh with the ultimate proppant concentration is not more than 300 kg/m3when pumping support a flow rate of 3.5 m3/min or more, and the concentration of the gelling establish not more than 2 kg/m3end nedoprodal mixture in an amount of 0.1-0.5 m3.



 

Same patents:

FIELD: mining.

SUBSTANCE: method involves drilling of a horizontal well, lowering to a vertical part of the well of a casing string and its cementing, lowering of a pipe string with a packer to a well, seating of the packer, formation of fractures of formation hydraulic fracturing (FHF) in the horizontal well shaft by pumping via the pipe string of fracturing fluid, and fixation of fractures by pumping of carrier fluid with proppant. The horizontal shaft is drilled perpendicular to direction of minimum main stress. FHF is performed by pumping of fracturing fluid with flow rate of 2-3 m3/min with formation of a longitudinal fracture in the formation relative to the open horizontal part of the well; crosslinked gel is used as fracturing fluid; then, fixation of a longitudinal fracture is performed by pumping via the pipe string of proppant of large fraction with carrier fluid - crosslinked gel. Then, FHF is performed by pumping of fracturing fluid with flow rate of 7-9 m3/min; line gel is used as fracturing fluid; after that, fixation of branched FHF fractures is performed by pumping of proppant of small fraction with carrier fluid - line gel.

EFFECT: improving FHF efficiency and reliability.

2 dwg

FIELD: oil and gas industry.

SUBSTANCE: method comprises test forcing of fracturing fluid and pile of fracturing fluid with proppant, correcting the fracturing project and performing of the main fracturing process. In highly permeable reservoirs with absolute permeability not less than 100 mD the main fracturing process is carried out with usage of proppant fractions, which include initial fraction with mesh size from 30/40 up to 20/40 and the main coarse fraction with mesh size of 12/18 and more in the volume not less than 70% of the total proppant quantity with final proppant concentration not less than 750 kg/m3. While injecting fraction with mesh size of 12/18 and more through perforated openings fluid consumption is set so that it does not exceed 3 m3/min and wellhead pressure is maintained at the level less than 35 MPa.

EFFECT: improving the efficiency of hydraulic fracturing for highly permeable strata.

1 tbl

FIELD: chemistry.

SUBSTANCE: invention relates to a propping agent and use thereof in hydraulic fracturing for oil and gas extraction. The ultralight propping agent is prepared from a mixture of raw materials comprising porcelain clay, pottery clay and kaolin and/or siliceous clay, in the following content, wt %: porcelain clay 5-85, kaolin and/or siliceous clay5-85, pottery clay 5-30. The ultralight propping agent with apparent specific gravity of 2.10 g/cm3 to 2.55 g/cm3 and volume density of 1.30 g/cm3 to 1.50 g/cm3 is prepared from a mixture of natural clays comprising porcelain clay, pottery clay and at least kaolin or siliceous clay, where alumina content is 5.5-35%. In the method of preparing said filler, high strength of the propping agent is achieved by controlling firing time in the range of 75-90 minutes and firing temperature of 1150°C to 1380°C. Sintered spherical granules prepared from a mixture of raw materials comprising porcelain clay, pottery clay and at least kaolin or siliceous clay, having a substantially circular or spherical shape, are characterised by a Krumbein coefficient of at least 0.8 with alumina content of 5.5-35%. The hydraulic fracturing method includes pumping into an underground formation a hydraulic fluid with flow rate and pressure sufficient for opening a fracture in the formation, and the fluid containing said filler is pumped into the fracture.

EFFECT: high strength of the propping agent and conductivity thereof.

29 cl, 13 tbl, 5 ex

FIELD: mining.

SUBSTANCE: method involves drilling of a horizontal well shaft, lowering and fixation of a shank with filters, lowering of a packer and its seating, formation of cracks in each of the zones, which correspond to intervals of parts of the horizontal shaft with insulation of the rest of its parts. With that, the lower end of a pipe string is located 1 m closer to the mouth from the distant formation interval; a string of flexible pipes is lowered into the above pipe string and it is equipped from below with an abrasive jet perforator; space between the pipe string and the string of flexible pipes is sealed at the well mouth. Groups of slit perforation holes are made with length of 20-30 cm and width of 15 mm with a phasing angle of 60° in every 1.5 m of the oil-saturated formation interval in the shank; reverse flushing is performed together with simultaneous movement of the string of flexible pipes from the mouth to the face throughout the length of the oil-saturated formation interval; the string of flexible pipes with a jet nozzle is removed, and hydraulic formation fracturing is performed with further fixation of a fracture by light-weight resin-coated propping agent with fraction size of 20/40 mesh in concentration of 1400 kg/m3 and its filling to the horizontal well shaft opposite the oil-saturated formation interval; the packer is removed; the pipe string is moved in the direction from the face to the mouth to the next oil-saturated formation interval; after that, the above operations are repeated starting from seating of the packer and ending with the packer removal in the rest oil-saturated formation intervals developed by the horizontal well shaft.

EFFECT: improving reliability of hydraulic formation fracturing and efficiency of fracture fixing.

4 dwg

FIELD: mining.

SUBSTANCE: method comprises the formation exposing by vertical well, tripping in the well on the pipe string of the water jet tool with even amount of injection nozzles and its placement in the preset interval of the formation, injection of driving fluid through injection nozzles of the water jet tool for caving in the formation, subsequent formation fracturing from caverns by the spray stagnation pressure in caverns. Meanwhile the water jet tool with a series of injection nozzles, located along the tool with the interval between nozzles in a line no more than two diameters of the casing is used. The water jet tool is rotated to the preset angle to change the direction of progressing of each subsequent fracture. The fractures are formed at driving fluid injection pressure in the casing below the side rock pressure. Before tripping of pipe string into the well in the bottom end of the water jet tool the rotating device and mechanical packer are installed. To compensate leakages and the wedging of fractures during the process of hydraulic formation fracturing an acid is added in volume equal to 20% of the volume of the driving fluid, the driving fluid is injected into the pipe string through the water jet tool into a cavern until fracturing, then into the annular space of the well an acid is injected to compensate the leakages and fracture wedging. The pressure of acid injection into annular space of the well amounts 85% from the pressure created in the pipe string during progressing of fracture, upon termination of progressing fracture and the wedging of fracture in the same direction raise a pipe string on 1 m, turn a pipe string on an angle applicable to a direction of forming of following fracture, and lowered, then the process operations are repeated.

EFFECT: improvement of accuracy of orientation of fractures, performance and reliability of fracturing of carbonate reservoirs.

3 dwg

FIELD: mining.

SUBSTANCE: method comprises the drilling of a horizontal well bore in oil saturated part of the productive formation of the well, tripping of the pipe string into the well, the forming of perforations and fractures using the a hydrofracturing of formation in the hole of horizontal well, successively, starting from the end of far from the vertical borehole axis. During the next hydrofracturing the section, through which hydrofracturing is performed, is insulated from another part of the string with a packer. During drilling of the horizontal well bore the permeability and porosity of rocks are determined and the intervals of the productive formation with low permeability and porosity of rocks are identified, and on completing of drilling the rock hydrofracturing pressure is determined in each interval of the horizontal borehole. Then the volumes of fracturing fluid and acid for each interval of the oil saturated part of the formation with low permeability and porosity are determined, then the pipe string is moved to the interval of the productive formation nearest to the borehole bottom, with low permeability and porosity, the mechanical packer is seated, from hole mouth using the pumping unit the gelled fracturing fluid is injected into the pipe string through nozzles of the water jet tool and reshape perforations, then, not stopping injection gelled of fracturing fluid on a pipe string, construct fracture pressure applicable to the given interval of the oil saturated part of the productive formation. After 30% drop of pressure of injection of gelled fracturing fluid in the pipe string the hydrofracturing fractures are formed, for this purpose into the annular space of the well an acid is injected at the variable flow rate ensuring maintaining of pressure of injection of gelled fracturing fluid in the pipe string 10% less than the fracture pressure for the given interval of the oil saturated part of the productive formation. The packer releasing is performed and the pipe string is removed from bottomhole to the mouth into the following interval of the oil saturated part of the formation with low permeability and porosity of rocks for forming perforations and conducting of a hydrofracturing of the formation with forming and progressing of fractures.

EFFECT: shortening time for formation hydrofracturing, improvement of performance and reliability of formation hydrofracturing.

3 dwg

FIELD: oil-and-gas industry.

SUBSTANCE: invention relates to subsurface formations processing in the production of hydrocarbons. Method of processing a subsurface formation crossed by a hole comprises: preparation of a processing fluid containing a viscoelastic surfactant with at least one degradable link, a hydrolysable material and a pH adjusting material. Note here that the latter has a pH value equal to or larger than 9 and contains a strongly alkaline substance and an oxidiser. The said processing fluid is injected in the subsurface formation. The invention is developed in dependent claims.

EFFECT: higher efficiency of the proppant transportation and decomposition at low temperatures.

21 cl, 1 tbl, 14 dwg

FIELD: oil-and-gas industry.

SUBSTANCE: proposed method comprises test injection of frac fluid and bundle of frac fluids with proppant, correction of frac project and execution of the main frac process. Well is equipped with extra string and tube space is cemented. At hydrofrac, components are injected via said extra string at communicated perforation interval and well top space at pressure lower than permissible for extra string and at low frac fluid flow rate.

EFFECT: intensified production at worn-out string.

1 tbl

FIELD: mining.

SUBSTANCE: as per method of hydraulic fracturing of underground medium, many sliding couplings are placed in a well passing into underground media; sliding couplings are placed in mutually spaced places along the well and provided with a possibility of control after arrangement in the well in any specified sequence; many signal devices are moved along a control line arranged in the well; each of the signal devices opens at least one of the multiple sliding couplings and performs hydraulic fracturing of underground media in any specified sequence in mutually spaced places along the well passing into underground media; sliding couplings are used at hydraulic fracturing and left in the well at performance of hydraulic fracturing.

EFFECT: optimisation of stresses created due to hydraulic fracturing from mutually spaced places along the well shaft.

16 cl, 5 dwg

FIELD: oil and gas industry.

SUBSTANCE: invention is related to oil industry and may be used for multiple hydraulic fracturing of the formation in horizontal shaft of a well. The method includes running in of a packer to the well on the flow string, performance of hydraulic fracturing in the first interval, formation of proppant plug, performance of hydraulic fracturing in the second interval. In order to obtain screening proppant plug concentration of the injected proppant is increased sharply up to 1100 kg/m3 and injection is stopped artificially due to increase of hydraulic resistance. The volume of injected mixture with increased concentration is calculated with consideration of filter part coverage in the first interval upon destruction of the cross-linked gel and complete settlement of proppant in the well bore. Upon completion of works on hydraulic fracturing in the first area withhold process is made for the period of destruction and complete settlement of unflushed proppant.

EFFECT: improving the hydraulic fracturing efficiency.

FIELD: ceramics.

SUBSTANCE: invention relates to manufacture of molded ceramic materials for use as propping agent in production of liquid and gaseous fluids from bored wells. Method comprises briquetting and heat treatment of aluminosilicates kaolin at 1150-1250оС. Resulting mix is ground to average grain size 3-5 μm and loaded into granulator. Before granulation, 1.2-3.0% mineralizer and 5-10% plasticizer are added. Mix is moistened with dozed amount of organic binder and stirred to form granules. At the end of granulation, fired ground material for powdering granules is added in amount 1.2-3.0%. Granules are dried and screened to isolate desired fraction, which is subjected to final firing at 1370-1450оС for 30-60 min and then re-screened into commercial fractions.

EFFECT: enabled manufacture of granules having low loose density and high strength allowing their use at depths up to 14000 feet (4200 m).

3 cl, 1 dwg, 1 tbl, 3 ex

FIELD: oil and gas production.

SUBSTANCE: proppant used in oil production involving hydraulic fracturing of formation contains ceramic granules coated with novolac resins supplemented by catalytic aqueous urotropin solution in organosilicon emulsion. Proppant preparation method comprises preparing granules and coating them. The latter operation is carried out as follows. Granules are heated to 150-160°C, dry novolac resin and catalytic urotropin solution are added at stirring in two equal portions with respect to the weight of resin and urotropin. When dropping temperature achieves 95-100°C, organosilicon emulsion is added provide following proportions of ingredients: 5.0-8.0% of novolac resin, 1.5-3.0% of 33% urotropin solution, 0.1-0.3% of organosilicon emulsion, and ceramic granules - the rest. Granules are finally cooled. Organosilicon emulsion is prepared at emulsion-to-water ratio 1:10.

EFFECT: increased strength of ceramic proppant and improved its quality due to resin coating applied with separating emulsion.

2 cl, 1 dwg, 1 tbl, 2 ex

FIELD: oil and gas production.

SUBSTANCE: fluid contains, wt %: industrial-grade powdered lignosulfonates 26.4-31.7, potassium chloride 4.9-5.9, aluminum sulfate 1.2-1.50, borax 0.4-0.5, formation water 40.3-44.7, and sweet water in proportion to formation water as 1:(1.98-1.99).

EFFECT: improved process parameters due to improved structurally mechanical properties of fluid, raised viscosity thereof, high sand-retention ability, and possibility of controlling lifetime without loss in high technological characteristics.

1 tbl, 2 ex

FIELD: oil and gas production.

SUBSTANCE: in a method of preparing propping agent including grinding, hydration, molding, drying, and calcinations of raw material, the latter is natural bentonite clay containing more than 90% montmorillonite, molding of spherical granules of propping agent 200 to 400 μm and 420 to 850 μm in size involves spray drying technique and molding of granules more than 850 μm in size is accomplished using beading process, and calcinations is carried out at 600-650°C. Method is applicable for use in intensification of oil and gas inflow from producing beds.

EFFECT: reduced expenses of hydraulic fracturing of formation.

2 tbl

FIELD: oil and gas production.

SUBSTANCE: invention relates to production of proppants, i.e. splitting granules, used in oil and gas production via breakdown way. Proppant of invention is obtained from caked two-component aluminosilicate fees in the form of granules with density 2.2-3.0 g/cm3 and 0.2-2.5 mm in size consisting of nucleus and shell, wherein one of components of aluminosilicate feed, which forms granule nucleus is a low-alumina substance containing less than 30% of alumina: coal combustion ashes, preliminarily fired kaolin, nepheline, nepheline syenite, feldspar, shale, or alumina production slime waste, and other component of aluminosilicate feed, which forms granule shell, is a high-alumina substance containing above 70% alumina: alumina dust of electrofilters of aluminum hydroxide calcination furnaces, industrial alumina, preliminarily fired bauxite, and exhausted catalysts based on active alumina form. Feed contains 50.0-95.0% low-alumina substance and 5.0-50.0% high-alumina component. In a method for production of proppant from two-component feed including (i) granulation upon addition of binding component in mixer-granulator provided with plate cup rotating at constant speed and rotor-type stirrer whose rotation speed is varied in dependence of granulation stage, (ii) drying, (iii) sizing of fried granules, (iv) firing of granules in rotary furnace, and (v) sizing of fired granules to form commercial fractions, when obtaining above-indicated proppant, low-alumina substance is used in the first granulation stage and, after granules 0.15-2.0 mm in size are formed, second granulation stage comprises addition of high-alumina substance into granulator followed by further granulation until granules 0.2-2.5 mm in size are obtained. Preliminary firing of low-alumina substance (as defined above) is carried out at 700-1200°C and the same of high-alumina substance (as defined above) at 700-1400°C. Firing of dried granules id effected at 1100-1600°C. Binding substance is used in the form of aqueous suspension of an organic binder (carboxymethylcellulose, methylcellulose, low-grade lignosulfates) of aqueous suspension of clay, wherein concentration of suspended binder is 1.0-10.0%. Aqueous suspension is added during granulation process in amounts 10.0 to 40.0% of the weight of initial feed.

EFFECT: enabled production of proppants from accessible raw materials (production wastes) without complication of existent technology.

9 cl, 1 tbl, 14 ex

FIELD: oil production from drill-holes, particularly to stimulate productive beds by bed drainage and formation fluid filtering channel forming.

SUBSTANCE: method involves forming at least one opened horizontal well bore or one opened horizontal well bore with at least one opened side branch bore extending along the strike in productive area thereof; filling the bore with hydrophobic granular material, wherein bore and branch bore filling is performed in portions along with compacting each portion of granular material up to material subsidence and existent natural bed cracks opening under the action of material compaction; installing and fixing filtering unit in well bore. Device comprises sectional or continuous pipe string, conical flared body fixedly secured to pipe string. Arranged in the body is system including pusher with central through channel and with cone. The pusher is hung inside the body and connected to cylindrical spring so that the pusher may be axially displaced and perform self-oscillations. Flared body and pusher cone are axially joined and form valve couple. Freely sliding impact bush is located over pusher anvil.

EFFECT: increased hydrocarbon material output and increased oil and gas recovery factors.

4 cl, 1 ex, 3 dwg

FIELD: mining, particularly to weaken coal bed and to increase recovery of desorbed methane.

SUBSTANCE: method involves drilling well from well surface; casing the well; exposing coal bed; injecting working liquid in the coal bed, wherein the working liquid has pressure enough to perform hydraulic fracturing of the bed and flow rate providing elongated crack forming. Salt solution, gel with propane or gel decomposition substance are used as the working liquid. Propane content in gel is gradually increased from 50-100 kg/m3 to 500-600 kg/m3 as cracks are formed and fixed. The salt is potassium chloride or propant having particle diameters of 20-40 meshes. Coal bed exposing is performed by cutting casing pipe and cement ring in central bed zone within interval of 100 mm so that the ready hole has height of 50-100 mm. The coal bed may be also opened by coal bed drilling below casing pipe for depth of 50-100 mm.

EFFECT: increased formation weakening and increased methane recovery.

3 cl, 2 ex

FIELD: technology for increasing recovery of hydrocarbons from foliate geological formations, which contain absorbed condensed gaseous hydrocarbons, by processing such geological formations with dehydrating compositions, containing surfactants, which cause dampening of geological formation with oil or leave aforementioned formations dampened with oil.

SUBSTANCE: methods may be used for excitation of influx of fluid substance from geological formation into well, or hydro-acid fracture, or hydraulic fracture, during maintenance or major repairs and when increasing influx from natural cracks or from geological formations never subjected to influx stimulation.

EFFECT: increased water removal efficiency, minimization of migration of low dispersion particles, increased extraction of hydrocarbons from underground formations, containing absorbed and compressed gaseous hydrocarbons.

3 cl, 4 ex, 6 tbl

FIELD: measuring technique.

SUBSTANCE: method comprises allowing the main liquid to flow through the Coriolis flow meter, measuring the density of the main liquid, and transmitting the signal containing measured value of the signal to the control system, adding the filler to the main liquid, allowing the mixture to flow through the Coriolis flow meter, and transmitting the measured value of density to the control system.

EFFECT: enhanced accuracy.

19 cl, 5 dwg

FIELD: manufacture of granulated materials used as wedging filler and gravel filter for control of sand flow.

SUBSTANCE: proposed granulated material has particles coated with two or more layers of hardenable coat; coated particles include granulated substrate and at least one layer of first curable resin practically embracing the substrate and at least one layer of second curable resin practically surrounding at least one layer of first curable resin; amount of curing agent in layer of first curable resin and in layer of second curable resin is lesser than that at which resin is practically cured.

EFFECT: increased compressive strength; increased elasticity; high strength at curing; forming strong blocks of wedging filler at pumping granulated material into well.

86 cl, 1 dwg, 12 tbl

Up!