Well operation stimulation

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

 

The invention relates to the oil industry and can be used with the intensification of the work of wells.

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 the movement of her crack, the stack pushes the fluid gap is ez proppant in the amount of 1.5-1.8 m 3produce 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 calculations produce a set of necessary volume of process water and prigotovleniya 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 fractions 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 the project (patent RF №2453695, publ. 20.06.2012 - prototype).

A disadvantage of known methods is that the methods are successfully and effectively applicable when the equipment of the well casing tubing with the packer and the well neiskushennoi casing equipped with an additional column of smaller diameter.

In the proposed invention solves the problem of intensification of the well worn with the production column.

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 the well will be equipped with additional operational casing annulus cement, while conducting hydraulic pump components for additional production string when reported perforation interval and the top of the well volume, at a pressure below the permissible additional production casing and while maintaining a small flow of fracturing fluid.

The invention

The fracturing in the well worn with the production column, equipped with an additional column, presents certain difficulties. When placing the packer from the casing of a pump to the pressure pipe (diameter from 60 to 73 mm) above the perforated interval and the injection of fracturing fluid with wedge material is increasing pressure because of the small bore in the tubing pipe. In most cases it is impossible to create a high concentration of proppant to create optimal parameters cracks, and in some cases have to abandon frac in this well. In the proposed invention solves the problem of providing hydraulic fracturing in the well worn with the production column.

The problem is solved as follows.

With the intensification of the work of the well will be equipped with additional operational casing annulus cement, and when conducting hydraulic pump components for additional production string when reported perforation interval and the top of the well volume, at a pressure below the permissible additional production casing and while maintaining a small flow of fracturing fluid. As fracturing wells in neiskushennoi the production column of hydraulic fracturing includes a test injection of fracturing fluid and a pack of fracturing fluid with proppant, the adjustment of the draft gap and carrying out the basic process of tearing.

Hydraulic fracturing is carried out in wells equipped with additional casing of small diameter, without the use of the column tubing and packer. In the case of fracturing in wells with additional performance to onami with the descent of the column tubing with an outer diameter from 60 to 73 mm in the process of hydraulic fracturing manifest complications in the form of increasing pressure because of the small bore in the tubing pipes of small diameter. As a result of significant losses due to friction can lead to unplanned technological "stop" - stop pumping. The standard action in order to avoid premature "stop" are the decrease of the viscosity of fracturing fluid, a low flow rate and concentration of the injected proppant and, as a consequence, the reduction of the total disjoining of the material, which leads to a short-term decrease in the efficiency of the process of hydraulic fracturing.

In the proposed method, the process of hydraulic fracturing is carried out on additional production string without limitation, the concentration and quantity of the injected proppant. The only limitation is allowable pressure on the additional column in the process of hydraulic fracturing, which can be adjusted by maintaining the flow of fracturing fluid at a low level (low flow of fracturing fluid is flow rate in the range from 1.8 to 2.5 m3/min).

Specific example

Spend intensification of work of the oil wells.

Objects intensification: layer Up in the interval 1673-1676 m

Lithology of interest: To seal off sandstones (absolute permeability 221 MD, porosity of 18.6%, clay content of 4.5%).

Well design and deflated equipment: main operational worn colon is and the diameter of 146 mm, additional production column with a diameter of 102 mm and a cement bridge between operational columns.

Down the tubing, hold the landfilling of bottom sandy bridge to a depth of 1680 m

Packer and the column tubing is not down.

Objects, perforated, not involved in the hydraulic fracturing missing.

Conduct a test injection. The initial acceleration of the object frac Q - 360 m3/day, initial pressure Rnac=15 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 1.0 g/cm3without pre-saturation of the bottomhole zone.

Fracturing produce sampling industrial water and its 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 in the production of "Himeko" loading 7.5 l/m3. 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 the Hilbert download and record pressure decline and processing of data obtained from the decay of pressure in the volume of 30 m 3frac fluid with the addition of 500 kg of fraction 20/40 proppant. Trial pack passed the perforation interval with increasing pressure to 1 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.

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 calculations produce a set of necessary amount of the process liquid and the cooking liquid bursting with testing. The test results are satisfactory. The process of hydraulic fracturing is carried out in accordance with a written revised plan with the concentration of proppant in stages: 120 kg/m3, 200 kg/m3, 300 kg/m3, 400 kg/m3, 600 kg/m3, 800 kg/m3and the pressure at the wellhead initial 18 MPa, ultimate 20 MPa, where the volume of the final produce determine how much additional production casing to the top of the perforated interval for you is this amount calculated not to produce 200 liters of the mixture. Work flow in the main process of 2.2-2.3 m3/min. 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 after 12 hours. The wellhead lasermedizin produce breakdown and the rise of packer equipment.

According to the results of processing the recording results of the estuarine pressures done process, the following data: the length of the crack created (one wing) was 89.2 m; fixed 48,9 m; the height of the crack created 14,27 m; fixed 3,19 m crack Width after removal of the pressure reservoir 3,47 mm - maximum, average is 1.16 mm; the concentration of proppant in the productive interval of the reservoir of 2.16 kg/m2. The mass of proppant pumped arranged in layers in the following way: 10000 kg

Well commissioned through 5 days after completion of the hydraulic fracturing with increasing liquid flow rate in more than 10 times without increasing the water content, factor productivity grew by more than 15 times.

Comparative analysis of PR is Loginova and control methods are presented in table 1.

Table 1
Comparative parametersThe proposed method 3180The control method 14929
The purpose wellsMiningMining
Perforation intervals1673-16761786,8-1790,4
Permeability (phase), MD90,674
Porosity, %18,618,5
Clay content, %4,55
The thickness of the perforated part of the layer, m33,6
Lithology collectorsSeal off the SandstoneSiltstone
The amount of proppant pumped by layers, t108
Spuskaemogo equipment:
The type of packernoABOUT
The length of the tubing, mno1796
The diameter of the tubing, mmno73
The maximum additional pressure on the production casing (tubing in the standard version), MPa23,370,0
Maximum discharge during pumping, m3/min2,42,8
Maximum proppant concentration, kg/m3800250
The maximum injection pressure, MPa20,050,0
The efficiency of liquid (% leaks with the influence of flow rate)42%66%
The length of the crack created/fixed (one wing), m89,2/48,963,857/27,04
The height of the crack created/documented the Naya, m14,27/3,1941,023/3,59
Crack width after clamping the maximum/average, mm3,47/1,160,85/0,543
Conductivity cracks (productive zone) - the average value of the closing659,07333,84
The flow rate of the fluid before and after hydraulic fracturing, m3/d3,25/162/4
Productivity index, before/after0,027/0,4510,062/0,110

Table 1 shows that the proposed method of intensification of wells does not apply packer system and the column tubing in contrast to the standard method. This allows the creation of high concentrations of pescarese mixture (500 kg/m3and more) that in most cases it is not possible when conducting hydraulic fracturing through the tubing diameter pipes 60-73 mm. at the same time excessive pressure for additional column of small diameter does not exceed the critical values by regulating the liquid flow rate is not more than 2.5 m3/min. In the end, the proposed method allows to create is the most optimal geometry and conductivity of the crack. Comparative parameters of the obtained performance well say more about effective hydraulic fracturing proposed method simultaneously reduces the costs of preparatory work and equipment depreciation (column tubing, packer).

Thus, the proposed method allows the fracturing wells without the risk of getting technological stop because of friction losses during the passage of sand-liquid mixture through the column tubing.

The main differences in comparison with carrying out fracturing in the standard column 89 mm tubing with the packer are allowable pressure on the additional column with 23.3 MPa):

- lack of packer and columns tubing;

the direction of pumping fluid through the casing of small diameter;

- limited flow of fluid to limit wellhead pressure (not more than 2.5 m3/min) for additional columns of small diameter;

- less friction losses when pumping liquid through the casing of small diameter than the injection through the string of tubing;

- more produce liquid.

The application of the proposed method will solve the problem of intensification of the well worn with the production column.

Way intensifies and work 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 the well will be equipped with additional operational casing annulus cement, while conducting hydraulic pump components for additional production string when reported perforation interval and the top of the well volume, at a pressure below the permissible additional production casing and while maintaining a small flow of fracturing fluid.



 

Same patents:

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: oil-and-gas industry.

SUBSTANCE: invention can be used for bed hydro frac. Proposed method comprises well wall perforation, lowering of string with packer, landing of packer, determination of total volume of gelated frac fluid, injection of said fluid in under-packer zone, creation in said zone of hydro frac pressure and development of fractures therein and fixation of said fractures by injection carrier fluid with proppant, holding of wells for pressure release, unpacking and removal of packer with string from the well. Note here that flexible string is lowered in pipe string so that bottom end of flexible string is located under pipe string end and at the bed centre. Space between pipe string and flexible string is sealed at wellhead to separate total volume of gelated frac fluid into two equal portions: frac fluid and proppant carrier, to inject in turns both in five cycle and in equal portions. For injection, proppant is used with density lower and higher than that of carrier fluid. In one cycle, fluid carrier and proppant are injected at a time in two equal portions: Carrier fluid with proppant of lower density is injected via pipe string with carrier fluid with proppant of higher density is injected via flexible string.

EFFECT: higher efficiency of hydro frac.

1 dwg

FIELD: oil-and-gas industry.

SUBSTANCE: invention can be used in well exposing the bed with interleaving and inhomogeneous reservoirs. 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. For said interleaving and inhomogeneous reservoirs that feature different filtration capacity of every stringers, main hydro frac is performed with the use of proppant fraction including initial fraction of 20/40 mesh and main coarse fraction of 12/18 mesh and larger at proppant concentration of not over 500 kg/m3. Concentration is increased smoothly in amount of not over 50 kg/m3 at every step starting from second step. At final step of proppant injection, fluid flow rate is decreased to constriction of wellhead pressure increase.

EFFECT: simulation of well exposing the inhomogeneous bed.

FIELD: oil-and-gas industry.

SUBSTANCE: composition comprises water, at least one water soluble foam make, i.e. silicon-containing ester contained in water and fluid other than water. Said water contains salt solution while fluid other than water contains liquid hydrocarbons. Stable foam is produced from waters by combining them with gas in the presence of hydrocarbon fluids with the help of above described foam maker. Fluid load is removed from gas well by injection therein of foam maker obtained as described above and removal therefrom of stable foam as it forms. Hydrofrac with the help of foam at drilling comprises injection of above described foam maker into well. Fluid formed are lifted to oil well surface by injection of said foam maker to be combined with well fluid. Invention is developed in dependent claims.

EFFECT: higher efficiency in the presence of great amounts of hydrocarbons.

23 cl, 7 tbl, 6 ex

FIELD: oil-and-gas industry.

SUBSTANCE: invention relates to stimulation of wells penetrating into underground beds, particularly, to well stimulation with the help of mica-type proppants at hydrofrac. Proposed method comprises the steps that follow. (a) Injection of thickened drill fluid. (b) Injection of thickened proppant suspension containing mineral plate-like particles. (c) Injection of deflecting material. (d) Reiteration of steps a-c at least three times. Note here that plate-like particles make 20-100 wt % of proppant while their depth makes 1-500 mcm.

EFFECT: efficient hydrofrac.

9 cl, 4 ex, 1 tbl, 7 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. At that the supported fly cutter is installed in the well so that it covers the worn out part of the production string, annular space between the fly cutter and the production string is cemented, the interval of productive stratum is perforated and the flow string with diameter of 89 mm with a packer is run in. The packer is set per 8-30 m above the fly cutter in the production string. During hydraulic fracturing components are pumped through the flow string and fly cutter, the volume of proppant is injected as sufficient for qualitative hydraulic fracturing at high concentrations of sandy-liquid slurry and flow rate of liquid.

EFFECT: performance of hydraulic fracturing in the well with worn out production string.

1 dwg

FIELD: chemistry.

SUBSTANCE: invention relates to a polymer proppant material which is a metathesis-radially cross-linked mixture of oligocyclopentadienes and methylcarboxy norbornene esters. Described is a method of producing said material, which includes preparing a mixture of oligocyclopentadienes and methylcarboxy norbornene esters by cross-linking dicyclopentadiene with methacrylic esters and polymer stabilisers given in claim 2 of the invention, heating said mixture to temperature of 150-220°C and holding at said temperature for 15-360 min, followed by cooling to 20-50°C. A radical initiator and a catalyst given in claim 2 of the invention are successively added to the obtained mixture of oligocyclopentadienes and methylcarboxy norbornene esters. Further, the obtained polymer matrix is heated to temperature of 50-340°C, held at said temperature for 1-360 minutes and then cooled to room temperature.

EFFECT: high heat resistance of the proppant material.

4 cl, 36 ex

FIELD: oil-and-gas industry.

SUBSTANCE: proposed method comprises well walls perforation in seam interval to depth of at least stress concentration zone length from well shaft. Pipe string with packer is lowered to seat it above the rood of perforated productive seam. Gelated fracturing fluid is injected to under-packer zone. Seam fracturing pressure is created in said zone to get seam fracture. Said fracture is, then, cemented by injection of gelated fluid, a carrier with dynamic viscosity of 30-50 cp with proppant with stepwise increase in concentration to 600-800 kg/m3 t every portion. Process fluid is injected into seam, well is held for pressure release, packer is released and withdrawn with pipe string from the well. Gelated fluid with calcium carbide is injected along with said fluid with proppant in three-five cycles and equal portions via pipe string. Fluid with calcium carbide is injected in amount one portion larger than fluid with proppant. Last fluid portion is fluid for water-based proppant while calcium-car-de-based fluid is used for crude oil. After aforesaid injection, 15%-water solution of hydrochloric acid is injected via pipe string in volume of crude oil injected into the well and forced through into seam in one and the half volume of pipe string. Well is held for chemical reaction for one hour. Pressure is, then, released via union fitted at wellhead into pipe string discharge line. Packer is released with withdrawn with pipe string from the well.

EFFECT: higher efficiency of fracturing, accelerated well development of hydraulic fracturing.

9 ex

FIELD: mining.

SUBSTANCE: proposed method comprises formation of fractures in different intervals of productive bed exposed by the well horizontal shaft by lowering the packer on pipe string. Packer is fitted in the well to feed hydraulic fracturing fluid in the filter mounted at every part of horizontal shaft corresponding to every said interval. Other parts are isolated to make fractures to be lined by forcing carrier fluid with proppant therein. Interval hydraulic fracturing is performed in direction from the face to head by pipe string lowering. Pipe string represents a string of flexible pipes with drillable packer at the end. Drillable packer seating is performed ahead of every section of the well horizontal shaft filter, fractures are produced and lined by forcing carrier fluid with proppant therein. To fix proppant in well zone, fixing solution is forced in pipe string at the rate of 0.5 m3 per 1 metre of filter length and into said zone in one and a half volume of pipe string. Thereafter, wellhead is sealed by wellhead gland. Well tubular space is lined out with hydraulic accumulator. Then, without decreasing hydraulic pressure in pipe string, it is lifted by 1 metre. Hydraulic accumulator takes up hydraulic pressure surge in well annulus while drillable packer tightly shuts off the filter section whereat hydraulic fracturing occurs. The, pipe string is withdrawn from the well to make interval hydraulic fracturing in other filter sections of the well horizontal shafts. At termination of hydraulic fracturing, pipe string at wellhead if equipped with drillable toll and jet head. Pipe string is lowered in the well to remove packers by drilling-out from wellhead to face. Then, drillable tool is cut out to force fluid in pipe string along with its rotation and displacement from face to head to jet processing of inner surface of filters via jet head.

EFFECT: higher efficiency and reliability, accelerated tripping processes.

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FIELD: oil-and-gas industry.

SUBSTANCE: invention relates to isolation of drilling problem zones. Proposed device comprises shaped shutter, shoe with check valve, expanding head of several sections, anchor assembly, hydraulic jack composed of piston with hollow rod and cylinder. After shutter is lowered in the well and expanding is by hydraulic pressure, shaped sections are expanded and gaged by lengthwise displacement of expanding head composed of punches under gravity of pipe string and by hydraulic jack, if required. Note here that force preventing the pipe string push-out at hydraulic jack operation is developed by hydraulic anchor. For efficient operation of hydraulic jack and anchor, this device exploits a pre-tunable hydraulic valve to activate hydraulic jack and anchor at expansion of cylindrical sections of shutter. Said valve comprises seat arranged outside the rod and pressed there against by spring at adjustable force. Hollow rod is equipped with extra valve that transmits from outside to inside.

EFFECT: higher reliability and efficiency.

2 cl, 8 dwg

FIELD: oil and gas industry.

SUBSTANCE: device comprises a shaped shutter, a shoe with return valve and fishing head, an expanding head formed of several sections and containing a locking mechanism from below, a hydraulic jack of coaxially connected hollow pistons with rods and cylinders. The anchor bend is made of sections placed outside of the respective cylinder of the hydraulic jack case, a cone rigidly fixed to the case and the hydraulic jack cylinder, slips with pushers interacting with a circular piston spring-actuated upwards from the case, which is located so that may overlap longitudinal coverage of the cylinder longitudinal channels and their opening at movement downwards. Upon running in of the shutter to the well and expansion of shaped areas by development of hydraulic pressure in it distribution of cylinder areas and calibration of shaped areas is performed by movement of the expanding head under action of the flow string weight and by hydraulic jack at sections, which require additional efforts. Rigid connection of hydraulic jack rods with the pipe string and punches of the expanding head and rigid connection of the anchor bend with the case and hydraulic jack cylinder allows summing up of the axial load from the hydraulic jack cylinder and weight of the drilling stem. Preliminary protrusion of the anchor slips promotes stronger fixation of the anchor gear in the casing string.

EFFECT: improving reliability of the anchor gear and efficiency of hydraulic jack.

4 dwg

FIELD: oil and gas industry.

SUBSTANCE: device includes bushings rigidly fixed to the upper and lower pipe ends, to end inner chamfers and though cuts placed evenly along the perimeter from butt ends, which can form the upper and lower bell mouths folded outside after expansion. The bushings have outer diameter, which is equal to inner diameter of the well after expansion. The end section is thickened and it may be connected rigidly to the well walls after expansion. The inner chamfer has length equal to the length of thickening; it consists of two chamfers, at that the upper most one is made under an angle four times bigger than the angle of slope of the expanding tool while the inner chamfer is made with the angle twice bigger. 7 or 8 cuts are made with length equal to the length of thickening and width equal to two thickness value of the bushing wall.

EFFECT: expanded functionality due to passage of any assemblies through expandable pipes, increased reliability.

3 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. At that the supported fly cutter is installed in the well so that it covers the worn out part of the production string, annular space between the fly cutter and the production string is cemented, the interval of productive stratum is perforated and the flow string with diameter of 89 mm with a packer is run in. The packer is set per 8-30 m above the fly cutter in the production string. During hydraulic fracturing components are pumped through the flow string and fly cutter, the volume of proppant is injected as sufficient for qualitative hydraulic fracturing at high concentrations of sandy-liquid slurry and flow rate of liquid.

EFFECT: performance of hydraulic fracturing in the well with worn out production string.

1 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. At that the well in the defect area of the production string is equipped with a fly cutter unsupported down the whole and the production string and cemented, the production string is perforated in the stratum interval by the cumulative system with density of 20-30 openings per a running metre at diameter of the perforated openings of at least 20 mm, the flow string with diameter of 89 mm is run in together with the packer and liner with diameter of 89 mm. The packer is set in the production string per 8-30 m above the fly cutter; the liner bottom is placed per 10-30 m above the stratum roof. When hydraulic fracturing is made components are pumped through the flow string and sandy-liquid slurry is pumped in concentration that does not exceed 500 kg/m3, with liquid flow rate from 1.8 up to 2.6 m3/min.

EFFECT: performance of hydraulic fracturing in the well with worn out production string.

2 cl, 1 dwg

FIELD: oil-and-gas industry.

SUBSTANCE: proposed method comprises detection of high corroded sections and filling the well with two-component mortar. The latter consists of iron chloride and sodium chloride. Assembly composed by iron pig with centraliser anode and heater is run on cable. Heater is located above anode while mortar is heated to 95-100°C. Voltage is fed in between operation string and node at current density of 10-20 A/dm2 Said assembly is smoothly lifted along operation string with stops at high chemical wear sections for their galvanic ironing.

EFFECT: higher efficiency of recovery.

7 cl

FIELD: oil and gas industry.

SUBSTANCE: device includes a body with the upper and lower subs, guiders at the external surface expanded bottom-up by mandrel inserts capable to limit a longitudinal movement by means of pushers along the guiders, and a cylinder with an annular piston placed below and interacting with the pushers and capable of an upward movement limitation at the calibrated load due to the adjuster. The cylinder actuator is connected rigidly to the lower sub; the body is equipped with a thrust from the outside. The adjuster is made as a spring installed between the body thrust and the annular piston before it is pressed downwards.

EFFECT: improved quality and maintainability of the profile packer installation, and reduced accident rate.

1 dwg

FIELD: oil and gas industry.

SUBSTANCE: device includes a profile packer with cylindrical sections and threaded connections, a shoe installed at its lower end with a back valve and a fishing head at the top, an expansion head made of several sections and consisting of a pipe string connection unit at the top and a lock unit from below, which is connected hermetically to the upper end of the profile packer with a fishing tool below for the shoe fishing head. The upper and lower ends of the profile packer are made as a longitudinal corrugated pipe with five and more branches. The lock unit above the profile packer is equipped with a special mandrel, which cone surface and the lower guide has protrusions for an inner surface of branches at the profile packer ends. The guide is made so that it can interact with an inner mandrel in the cylindrical section of the profile packer. The shoe is an assembled unit consisting of an inner insert with a fishing head and a valve placed hermetically in the cylindrical section of the packer lower end and a fixture interacting with the lower butt end of the profile packer and connected to the inner insert.

EFFECT: higher reliability, expanded technological capabilities.

5 dwg

FIELD: mining.

SUBSTANCE: proposed device comprises pipe string for running, hollow hydraulic cylinders, circular pistons with hollow rods aligned in appropriate hydraulic cylinders to displace axially therein and mandrelling head for fitting of shutter. Hydraulic cylinders are connected from above with pipe string. Hollow rod is connected from below with mandrelling head. Every circular piston is composed by a sleeve with ring bulge with self-packing glands locked at this sleeve from top and bottom. Bulge outer surface is composed by ring belt. Rods of pistons are interconnected for limited radial and angular displacement.

EFFECT: higher reliability, longer life.

3 dwg

FIELD: mining.

SUBSTANCE: proposed device comprises casing, extra production string and flow string. Extra production string is used which does not extend to well head. Flow string is equipped with fixed external coupling secured above extra production string and nearby the top of extra production string. Said coupling represents that with OD larger than ID of extra operation string and not larger than OD of standard string gage for casing and with OD-to-coupling height varying from 0.70 to 0.83.

EFFECT: simplified liquidation of failures, accelerated repair.

2 dwg, 2 tbl

FIELD: oil industry.

SUBSTANCE: device has serially connected assemblies, including bodies, central passing channels and dies. Rods are placed in central passing channels and interacts with dies by means of pushers. Dies are fixed in slanting grooves of body. Rods of upper assemblies are spring-loaded to hold dies in non-operating position, and of lower ones - to force dies to operating position.

EFFECT: higher reliability and efficiency.

2 cl, 5 dwg

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