Method of intensification of operation of well

FIELD: mining.

SUBSTANCE: method comprises a test injection of fracturing fluid and a pack of fracturing fluid with proppant, correction of the fracturing project and carrying out the main fracturing process. At that in the high-permeability reservoirs having an absolute permeability of not less than 100 mD, the main process of hydraulic fracturing is carried out using standard working fluid flow rate of 2.2 m3/min to 4.0 m3/min. When pressing the proppant-gel mixture the stepwise reduction of flow rate is carried out with the reduction step in the range of 0.1 m3/min to 0.5 m3/min, but to the value of not less than 2.0 m3/min. The final concentration of proppant is set of not less than 800 kg/m3.

EFFECT: increase in efficiency of intensification of operation of the well by creating a wider and conducting crack in the bottom-hole area of the layer.

1 tbl

 

The invention relates to oil industry and may find application with the intensification of the work of wells that have penetrated the aquifer with high permeability collector.

The known method of hydraulic fracturing, which produce pre-technical analysis of water, test the gelling agent on the solubility and gelation, with the satisfactory result of dissolving the gelling agent in water and re-tested for gelation, with satisfactory results in the solution of gelling agent in the water add a clay stabilizer, the demulsifier and the regulator of destruction, is pumped into the borehole and the resulting solution during injection, solution is injected in the destructor, and the stapler, thereby forming a fluid gap, fix replace the volume of oil well fracturing fluids, stop the injection and record the pressure decay, resume the pumping of fracturing fluid displacement flow on hydraulic fracturing, is pumped "cushion" of fracturing fluid in an amount of from 3 to 6 m3, and then perform the fix trial packs of fracturing fluid with proppant weighing up to 1 ton with a concentration of from 30 to 200 kg/m3, bring it to the perforated interval, note the initial wellhead pressure and then record the nature of its changes in the process of passing the bundles through the perforated interval and movement e� on the crack, the pack forced a tear fluid without proppant in the amount of 1.5-1.8 m3produce prodavcu of fracturing fluid in the volume equal to the volume of the column tubing, the zone below the packer to the top of the perforated interval and another 2-4 m3, stop prodavcu and record the pressure decay, produce recording and processing the intensity reduction of the wellhead pressure, the obtained data is processed, receive data about the effectiveness of fracturing fluid, the pressure value of the voltage gradient in the reservoir, time and clamping pressure cracks, the pore pressure in the reservoir, the hydraulic pressure losses in the perforated interval and bottom part of the reservoir, based on the data produced adaptation of design data process of hydraulic fracturing to the received data processing of the test injection, the corrected data is used to re-calculate the three-dimensional model of hydraulic fracturing and the conduct of an updated version of hydraulic fracturing, change the original plan of holding the main process of hydraulic fracturing by replacing the original data mining-geological factors are received by the program after the process of injection test, conduct modified the basic process of hydraulic fracturing, in the conduct of the amended basic process of hydraulic fracturing on the basis of the generated RA�of cetov produce a set of required amount of process water and cooking gel testing, upon satisfactory test results, the process of hydraulic fracturing is carried out in accordance with the amended plan, where the final produce defined as the sum of the volume of the column tubing and the zone below the packer to the top of the perforated interval, in identifying growth wellhead pressure during injection trial packs of fracturing fluid with proppant in an amount of from 1 to 2.5 MPa increase the amount of 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 effectiveness of this event is evaluated by the reduction of the wellhead pressure as you progress through the pack of proppant through the perforations and by reducing the pressure to 1 MPa and more 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 the concentration of proppant in the following stages reduced, limited to maximum values of up to 350-400 kg/m3, fix proppant-gel mixture is performed by two portions, the first portion of the dosage destructor carried out according to the concentration, which provides a complete decomposition of the gel, and time of closing of the crack is not less than 12 hours, the second portion of the dosage of destruc�ora performed according to the concentration, providing process complete decomposition of the gel, and time of closing of the crack is not more than 4 h after injection proppant-gel mixture stop pumping units and record the pressure decay for information about the quality of the process of hydraulic fracturing, the intensity of pressure decay, the presence of residual communication with the reservoir, the absence of effect of preproduce, after which the wellhead is closed, the hole left waiting for pressure decay, after the necessary time for the destruction of the gel to produce the corresponding residual wellhead pressure to atmospheric, the beginning of the bleed excess pressure is produced after 4 h, at pressures above 4 MPa wellhead pressure gauge venting is produced with a flow rate of 30 l/min to atmospheric and at a pressure less than 4 MPa wellhead pressure gauge venting produce full opening wellhead gate valves, wellhead lasermedizin produce failure of the packer and the rise of underground equipment (Patent RF №2453694, publ. 20.06.2012).

Closest to the invention to the technical essence is a method of hydraulic fracturing, according to which produce pre-technical analysis of water, test the gelling agent on the solubility and gelation, with the satisfactory result dissolve Helio�Converter in water and re-tested for gelation, if satisfactory results in the solution of gelling agent in the water add a clay stabilizer, the demulsifier and the regulator of destruction, is pumped into the borehole and the resulting solution during injection, solution is injected in the destructor, and the stapler, thereby forming a fluid gap, fix replace the volume of oil well fracturing fluids, stop pumping and produce a record of the pressure decline, resume the pumping of fracturing fluid displacement flow on hydraulic fracturing, is pumped "cushion" of fracturing fluid in an amount of from 3 to 6 m3, and then perform the fix trial packs of fracturing fluid with proppant weighing up to 1 ton with a concentration of from 30 to 200 kg/m3, bring it to the perforated interval, note the initial wellhead pressure and then record the nature of its changes in the process of passing the bundles through the perforated interval and the motion of the crack, the pack forced a tear fluid without proppant in the amount of 1.5-1.8 m3produce prodavcu of fracturing fluid in the volume equal to the volume of the column tubing, the zone below the packer to the top of the perforated interval and another 2-4 m3, stop prodavcu and record the pressure decay, produce recording and processing the intensity reduction of the wellhead pressure, the obtained data is processed, receive data about the effectiveness of roboticist gap, the pressure value of the voltage gradient in the reservoir, time and clamping pressure cracks, the pore pressure in the reservoir, the hydraulic pressure losses in the perforated interval and bottom part of the reservoir, based on the data produced adaptation of design data process of hydraulic fracturing to the received data processing of the test injection, the corrected data is used to re-calculate the three-dimensional model of hydraulic fracturing and the conduct of an updated version of hydraulic fracturing, change the original plan of holding the main process of hydraulic fracturing by replacing the original data mining-geological factors are received by the program after the process of injection test, conduct modified the basic process of hydraulic fracturing, when performing the modified basic process of hydraulic fracturing on the basis of calculations produce a set of required amount of process water and the preparation of the gel with the testing, if the results of the test, the process of hydraulic fracturing is carried out in accordance with the amended plan, where the final produce defined as the sum of the volume of the column tubing and the zone below the packer to the top of the perforated interval, the fix proppant-gel mixture is performed by two portions, the first portion of the set the end�concentration of proppant to 300 kg/m 3, dosage destructor carried out according to the concentration, which provides a complete decomposition of the gel and time of closing of the crack is not less than 12 hours, the second portions establish the concentration of proppant in excess of 300 kg/m3, dosage destructor carried out according to the concentration, which provides a complete decomposition of the gel and time of closing of the crack is not more than 4 hours, at the end of produce proppant-gel mixture stop pumping units and record the pressure decay for information about the quality of the process of hydraulic fracturing, the intensity of pressure decay, the presence of residual communication with the reservoir, the absence of effect of preproduce, after which the wellhead is closed, the equipment is removed and the hole left waiting for pressure decay, after the necessary time for the destruction of the gel to produce the corresponding residual wellhead pressure up to atmospheric, start bleed excess pressure is produced after 4 h, at pressures above 4 MPa wellhead pressure gauge venting is produced with a flow rate of 30 l/min to atmospheric and at a pressure less than 4 MPa wellhead pressure gauge venting is opening wellhead gate valves, wellhead lasermedizin produce failure of the packer and the rise of underground equipment (Patent RF№2453695, publ. 20.06.2012 - prototype).

A disadvantage of known methods is that the methods successfully and effectively applicable in low permeability and rupture sredneprotsentnyh layers, while in high-permeability formations the result of hydraulic fracturing to ensure sufficient conductivity of the crack. This may be a limiting factor in increasing the productivity of wells, whereby the efficiency of hydraulic fracturing becomes low.

The invention solves the problem of intensification of wells that have penetrated the high-permeability layer.

The task is solved in that in the method of intensification of the well, including test pumping of fracturing fluid and bundles of fracturing fluid with proppant, the adjustment of the gap project and carrying out the main process of the gap, according to the invention in high-permeability reservoirs, having the absolute permeability not less than 100 MD, performed the basic process of hydraulic fracturing with the working fluid flow from 2.2 m3/min to 4 m3/min, in the final stage of the process when produce sand-liquid mixture is produced step-by-step reduction in the rate of injection of displacement fluid with a step decrease from 0.1 m3/min to 0.5 m3/min to a value of not less than 2 m3/min, with a final concentration of proppant at least 800 kg/m3.

Summary of the invention

According to the proposed method candidates for hydraulic fracturing are highly permeable reservoirs, represented by sandstones, clogged sandstones and siltstones. The effective power of such layers is not less than 2 m, the absolute permeability is not less than 100 MD. During the standard fracturing in the reservoir, the increment in the fracture gap happens all the time, the result is a long and narrow channel of low conductance. The contrast in permeability between the formation and the propped fracture is the determining factor. In weakly and sredneprotsentnyh reservoirs, the development of cracks in length without creating a high final concentration proppants packs can increase well productivity. However, in highly permeable formations lack the final concentration of proppant conductivity and cracks is a limiting factor in increasing the productivity of wells, thereby not produced the full potential of high-permeability layer. The invention solves the problem of intensification of wells that have penetrated the high-permeability layer. The problem is solved as follows.

Typically, the fracturing perform the maintenance of the working fluid flow in continuous mode. In some cases, for example, at critical growth wellhead pressure�tions and avoid technological "Stop" reduce the liquid flow rate and concentration of proppant in the mixture.

For more effective fracturing with permeability more than 100 MD are encouraged to apply the standard mode of fluid flow from 2.2 m3/min to 4 m3/min, and in the final stage in produce sand-liquid mixture to reduce the speed of the liquid flow rate in increments of 0.1 m3/min to 0.5 m3/min, but to a value of not less than 2 m3/min. Conducting hydraulic fracturing with a reduction in fluid consumption can increase fixed width and concentration of proppant in the wellbore portion of the formation by limiting the movement of the mixture in the depth of the crack. Also reduces the height of the crack development, eliminated inefficient distribution of proppant in clay bridges, thereby increasing the amount of propping agent in the productive layer.

The proposed method allows to increase the width and conductivity of the fixed cracks in the bottom of the stratum. Created and fixed the crack by the proposed method can significantly increase the productivity of high-permeability layers, to create high-conductivity channels, is fixed throughout the thickness of the reservoir to maximize the potential of the well.

Examples of specific performance

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

Objects of intensification: layer Up in the interval 179-1742,4 m, distance to water-saturated formation is more than 20 m.

Lithology sites: Sandstone (absolute permeability 227 MD, porosity of 18.3%, clay content of 5.5%).

The design of the well and lowered equipment: operating the column with a diameter of 168 mm sealed.

Pull tubing, carry out the dumping of slaughter sandy bridge to a depth of 1745 m.

Pull the packer on the column tubing with a diameter of 89 mm to a depth of 1720 m and produce planting packer.

Conduct a test fix. The initial acceleration of the object fracturing Q-290 m3/day, the initial pressure of Rnac=9 MPa, ultimate pressure Rcon=9 MPa. Perform the determination of the quality of communication with the reservoir by injection of 5 m3the fluid density 1.1 g/cm3without pre-saturation of the bottomhole zone.

As a result, produce sampling industrial water and their analysis on the content of mechanical impurities, the content of free hydrogen ions and temperature, produce test preparation of fracturing fluid, performing the test on the blooming and stitching. The results are satisfactory.

Produce a test fix with a record of pressure decay and processing of data obtained from the decay of the pressure - volume 26 m3of fracturing fluid with addition of 1000 kg of proppant fraction 20/40. Trial pack passed the perforated interval with ro�the pressure - at 1.5 MPa. The data is treated, receive data about the effectiveness of fracturing fluid, the net value of the pressure gradient stress in the reservoir, time and clamping pressure cracks, the pore pressure in the reservoir, the hydraulic pressure losses in the perforated interval and bottom of the stratum. Based on the data produced adaptation of design data process of hydraulic fracturing to the received data processing test injection.

Carry out the basic process of hydraulic fracturing.

The corrected data is used to re-calculate the three-dimensional model of hydraulic fracturing and Refine the plan for the conduct of hydraulic fracturing. On the basis of calculations produce a set of required amount of process fluid and the preparation of fracturing fluid with the testing. The test results are satisfactory.

Carry out the basic process of hydraulic fracturing with the use of fractions of proppant comprising a primary fraction of the dimension of 20/40 mesh in a volume of 1 t and a main fraction dimension 16/20 mesh in the amount of 7 tons of proppant with a final concentration of proppant 850 kg/m3. The total volume of proppant is 9 T. working fluid flow when pumping sand-liquid mixture is 2.9 m3/min at a pressure at the wellhead 19 MPa, at produce sand-liquid mixture posh�said reduce the consumption (2.9 m 3/min, 2.6 m3/min, 2.3 m3/min, 2.0 m3/min).

The final produci defined as the sum of the volume of the column tubing and the zone below the packer to the top of the perforated interval minus the volume of the computational nedopodacha. At the end of produce proppant-gel mixture stop pumping units and produce a record of the pressure drop, after which the wellhead is closed, the equipment is removed and the hole left waiting for pressure decay. After the necessary time for the destruction of the gel to produce the corresponding residual wellhead pressure to atmospheric. Start bleed excess pressure is produced after 12 h. the wellhead lasermedizin produce breakdown and the rise of the packer equipment.

Example 2. Perform as example 1. Used working fluid flow 4 m3/min In the process of produci reduce the flow of fluid through step by step with 4.0 m3/min to 2.5 m3/min (4 m3/min, 3.5 m3/min, 3.0 m3rpm, 2.5 m3/min). The final concentration of proppant is 800 kg/m3.

Example 3. Perform as example 1. Used working fluid flow 2.2 m3/min In the process of produci reduce the flow of fluid through step by step with 2.2 m3/min to 2.0 m3/min (2.2 m3/min, 2.1 m3/min, 2.0 m3/min). A final concentration of Propp�NTA is 900 kg/m 3.

By results of processing of results record wellhead pressures done process the following data were obtained: length of the crack created (one wing) - 70,3 m; fixed - 69,9 m; height of the crack created - 7.5 m; fixed - 4,8 m. the Width of the crack after removing the pressure on the seam of 2.25 mm, the maximum width of the crack at intervals of perforation 15.3 mm; conductivity cracks 645 MD/m. the Mass of proppant pumped 9000 kg (20/40 - 2000 kg 16/20 - 7000 kg).

The well is put into operation after 16 days after completion of hydraulic fracturing to increase productivity factor of more than 6 times without increasing water cut.

Comparative analysis of the proposed method and the prototype presented in table 1.

From the above values in the table No. 1 shows that the wells have comparable porosity and permeability of formations. However, the distinguishing features of the proposed method is the use of stepwise reduction of the flow when produce propane-liquid mixture. The process of hydraulic fracturing was carried out with the restriction of development of cracks in length and height in the final stage the purpose of the prevailing development in the width of the bottom part, with a final concentration of proppant 850 kg/m3. The process was carried out with the working fluid flow 2.9 m3/min with a step decrease� flow rate with produce up to 2 m 3/min (2.9 m3/min; 2.6 m3/min; 2.3 m3/min; 2.0 m3/min). Thus obtained, the crack has a shorter length unlike standard hydraulic fracturing, however, has a greater width in the bottom part, fixed in height throughout the effective thickness of the layer has high conductivity for maximum performance well. Thus, the proposed method can effectively carry out hydraulic fracturing wells in high-permeability reservoirs.

Application of the proposed method will allow to solve the problem of intensification of wells that have penetrated the high-permeability layer.

The method of intensification of the well, including test pumping of fracturing fluid and bundles of fracturing fluid with proppant, the adjustment of the gap project and carrying out the main process of the gap, characterized in that in high-permeability reservoirs, having the absolute permeability not less than 100 MD, performed the basic process of hydraulic fracturing with the use of a working fluid flow in the range from 2.2 m3/min to 4.0 m3/min, with step by step reduction of the flow when produce proppant-gel mixture, with a step reduction in the range 0.1 m3/min to 0.5 m3/min to a value of not less than 2.0 m3/min, with a final concentration of proppant at least 800 kg/m .



 

Same patents:

FIELD: oil and gas industry.

SUBSTANCE: method involves landing of tubing string with packer to a well, packer seating, hydraulic fracture liquid injection by the tubing string with packer to a low-permeable formation, hydraulic fracturing of the low-permeability formation with further fracture fixation by injection of liquid carrier with propping agent via the tubing string, pressure relief in the well. Before tubing string landing to the well, water-bearing interlayer interval of the low-permeable formation is perforated to form perforation holes. Then at the wellhead the tubing string is filled upwards from the bottom with a plug, lower hole rows, packer, upper hole rows and additional packer. Inside the tubing string, a mobile bushing with radial channels is inserted to seal lower hole rows of the tubing string tightly in initial position and connecting the tubing string via upper hole rows and perforation holes to the ware-bearing interlayer. A seat is installed inside the mobile bushing, the mobile bushing and the seat are fixated in initial position against the tubing string by a differential shear element. The tubing string is landed to the well, packer and additional packer are seated in the well so as to shot water-bearing interlayer off tightly at two sides, upper water0bearing interlayer is isolated by injection and flushing of water isolation composition via the tubing string through upper hole rows to the water-bearing interlayer through perforation holes under pressure twice lower than hydraulic fracture pressure of the formation, process break is made for solidification of the water isolation composition, then a ball is dropped to the tubing string from wellhead, and overpressure is formed in the tubing string. First the shear element is destroyed, and under impact of overpressure above the ball, mobile bushing is shifted down along the tubing string to a stop against the tubing string plug, overpressure increase in the tubing string is continued, and the shear element is destroyed again. The seat is brought down to a stop against the plug under impact of overpressure above the ball. Upper hole rows of the tubing string are shut off tightly by the mobile bushing, and lower hole rows are connected to the tubing string by radial channels of the mobile bushing.

EFFECT: improved efficiency of hydraulic fracturing.

2 dwg

FIELD: oil-and-gas industry.

SUBSTANCE: proposed method comprises drilling the well horizontal shaft in oil-saturate section of production bed, cementing of annulus between casing and bed rock. Casing pipe is perforated in said well shaft oriented in azimuth by intervals with the help of slot perforator lowered in the well on string in a single trip. String with packer is lowered in the well to fit the packer in place. Fracturing fluid is injected via said string for hydrofracturing in said horizontal well shaft. Well shaft us drilled in the bed parallel with direction of minimum main strain. Plug is fitted at string lower end and two packers are arranged at flexing pipe string. Note here that through holes are made at the latter. Said flexing pipe string with packers is lowered into well shaft for hydraulic fracturing via perforated intervals by cutting of every interval of perforation on both sides. Bed fracturing is started from horizontal well interval nearby the bottom and fluid is forced via flexible pipe string via through holes at flow rate of 2 m3/min to produce transverse fractures from perforation interval relative to well shaft. Note here that fracturing fluid is composed of hydrocarbon-based cross-linked gel. Made fractures are secured by injection of proppant of 12/18 mesh fraction with cross-linked gel, a carrier fluid. Packers are removed to displace flexible pipe string for hydraulic fracturing of the bed in the next perforation interval. Then, above jobs are reiterated. Then, flexible piper string with packers is withdrawn from the well to lower pipe string therein. Packer is fixed at well vertical part for hydraulic fracturing by injection of fluid via horizontal well shaft to produce lengthwise fractures at flow rate of 8 m3/min. Linear gel is used as fracturing fluid. Said lengthwise fractures are secured by injection of ground quartz with linear gel as carrier fluid.

EFFECT: higher efficiency of fracturing.

2 dwg

FIELD: oil and gas industry.

SUBSTANCE: group of inventions is referred to intensification of hydrocarbons production from formation by hydraulic fracturing. The method of proppant induced aggregation in hydraulic fracture crack includes makeup of the proppant carrier fluid, which viscosity is increased by usage of polymer gel capable of syneresis; injection of the proppant suspension and the above fluid to the well; initiation of gel syneresis with formation of proppant aggregations. According to the second version the method includes initiation of polyelectrolyte complex formation with proppant aggregations. According to the third version the method includes makeup of the proppant carrier fluid containing polymer at temperature less than its critical solution temperature; injection of the proppant suspension and the above fluid to the underground formation at temperature more than the lowest limit of polymer critical solution temperature with formation of proppant aggregations.

EFFECT: inhomogeneous distribution of proppant in hydraulic fracture cracks, which increases conductivity and productivity of the well.

31 cl, 2 tbl, 12 ex, 5 dwg

FIELD: oil and gas industry.

SUBSTANCE: treatment method of underground hydrocarbon-containing formations involves the following: a) provision of a composition including a thickening initiator measuring pH, and a polymer capable of hydration in a certain pH range; b) pumping of a composition with pH value beyond the limits of the above pH range; c) activation of an action of pH thickening initiator for displacement of pH composition to the above range of its values, and d) provision of a possibility of increasing viscosity of the composition and shaping of a plug. According to another version, a processing method of underground hydrocarbon-containing formations involves the following: a) provision of a composition containing a polymer capable of hydration in a certain pH range; b) pumping of the composition with pH value beyond the limits of the above pH range; c) provision of a pH changing thickening initiator; d) activation of the action of the thickening initiator for displacement of pH composition to the above range of its values, and e) provision of a possibility of increasing viscosity of a composition and shaping of a plug. The invention has been developed in dependent claims.

EFFECT: improving efficiency of initiation and control of plug formation.

15 cl, 5 ex, 3 dwg

FIELD: oil and gas industry.

SUBSTANCE: in a carbonaceous oil deposit development method that includes drilling of horizontal wells with a core sampling from the productive formation, performance of core laboratory tests, acid treatment and multiple hydraulic fracturing of the formation in these wells, according to the invention the core is sampled at different sections along the whole length of the horizontal shaft. The sampled core is subjected to the laboratory tests to determine the fracturing pressure, at that the sections are identified along the shaft where the minimum fracturing pressure Pmin, MPa, and the maximum fracturing pressure Pmax, MPa is required. Each section is treated by acid; at that the acid concentration for each section is set as identical. During the acid treatment each treated section of the formation is isolated temporarily by packers from the remaining part of the well. Then multiple proppant hydraulic fracturing of the formation is made under pressure that does not exceed Pmax. At that at the sections, where Pmax is required the acid treatment is performed in a volume of Qmax, m3/m, at the sections where Pmin is required the acid treatment is performed in a volume not exceeding 10% of the maximum value. At the remaining sections the volume of the injected acid is defined proportionally to the obtained fracturing pressure in compliance with the following ratio: Qn=QminQmaxPminPmax(PnPmin)+Qmin, where Qn is the specific volume per meter of the thickness, which is required for the injection to the nth section of the formation along the horizontal shaft, m3/m, Pn is the required fracturing pressure at the nth section of the formation along the horizontal shaft, MPa.

EFFECT: improved sweep efficiency and increased oil recovery of the oil deposit.

1 dwg

FIELD: oil and gas industry.

SUBSTANCE: method includes running of production string with packer in to the well, setting of the packer, hydraulic fracturing by injecting fracturing fluid through production string with packer to the producing reservoir with further proppant injecting through perforated interval in the low-permeable bed, pressure releasing from the well. Additionally perforated interval in the low-permeable bed is isolated temporary, the interval of clay layer is perforated using alternating charges of large diameter and deep invasion; then the production string with packer is lowered so that the lower end of the production string is at the level of clay layer roof, the packer is set in the well, the low-permeable bed is fractured with formation of cracks by injection of fracturing fluid along the production string through perforated intervals in clay layer. Then bank of oil-based cross-linked gel is injected to cracks in volume of 3-5 m3 with flow rate of 10 m3/min. Proppant moisture is used as proppant. Then cracks are reinforced by dosed injection of fracturing fluid and proppant mixture starting with concentration of 400 kg/m3 for proppant mixture with stepped increase of its concentration in fracturing fluid per 200 kg/m3 for each dose and flow rate of 5 m3/min. The proppant mixture is made at the wellhead with the following ratio of components, wt %: proppant 12/40 mesh - 30%; proppant 18/20 mesh - 30%; quartz flour - 40%. Upon completion of hydraulic fracturing of low-permeable bed temporary isolation is removed from the perforated interval of the low-permeable bed with formation of hydraulic connection between the borehole and created fracture.

EFFECT: improved reliability of hydraulic fracturing for low-permeable bed with clay layers and bottom water.

1 dwg

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

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: 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!