Water and gas influx limiting method with well productivity recovery

FIELD: oil and gas industry.

SUBSTANCE: water and gas influx limiting method with well productivity recovery includes running in of a perforator at the flow string, perforation of the production casing, isolation of water and gas influx and elimination of leak-tightness failures in the production casing by injection of isolating compound through new openings thus forming a water-shutoff screen. At that perforation of the production casing and injection of the isolating compound are carried out during one trip of the perforator. A hydromechanical perforator designed to make openings in the production casing and further injection of the isolating compound is used as a perforator. At that perforation of the production casing is made within the interval of water and gas inflows.

EFFECT: providing reliable recovery of productivity and injection capacity of wells, improving efficiency of stratal water isolation, reducing quantity of round-trip operations.

3 cl

 

The invention relates to the oil and gas industry, namely, to restore the productivity and injectivity idle discharge, of oil and gas wells after repair work, including the elimination of leaks on production casing and annulus fluid circulation water, gas, recovery of the cement sheath, restrictions watagatapitusb on the sole and on the formation, liquidation annular manifestations.

Known way to restore productivity and commissioning of idle oil and gas wells, including production of repair and insulation works, the opening of a productive layer in the casing and putting the well into operation [Application 98116654/33 RF, E21B 47/00, publ. 2000].

The disadvantage of this method are the high cost of drilling the second wellbore, and the low probability of its falling into the productive zone, especially in reservoirs with lenses and layers of rocks, with enough good reservoir properties.

There is also known a method of restoring productivity and commissioning of idle oil and gas wells, including production of repair and insulation works, re-opening of a productive layer in the initial interval with depth extending radially beyond the contaminated borehole zone, the ri that produce mild perforation operational columns [RF Patent №2231630 C1, IPC 7 E21B 43/00, 43/32, publ. 2000].

The disadvantage of this method is that it provides restore well productivity, prevent the flow of formation waters, liquidation flows only in reservoirs with low permeability and porosity and are located close to oil-water contacts, fastening is made of cement composition of the cement.

A known method of restoring the integrity of the casing, including injection into the annular space of the well isolation structure, its aeration in the wellbore, the cyclic change of the gas flow through the insulating structure by periodically opening and closing the annular space and the injection of the insulating composition in place of leakage in the casing in the production well [Copyright certificate №1624127, CL E21B 33/13, publ.1991].

The disadvantage of this method is that oil well previously subjected to the drying gas, which complicates the process and, in addition, the low reliability of isolation.

There is a method of repair work in the production well, whereby through the string of tubing lowered into the interval of leakage in the casing, pump the estimated quantity of cement, raise a column of a pump and the compressor is different pipes on high, the corresponding upper bound of cement, and at the expense of reverse circulation and squeezing fluid "cut" the cement slurry in order to prevent sticking of the column tubing and reduce cement and glass, subject to drilling after the RFQ [Ametov, I. M., N. Sherstnev.M. The use of composite systems in process operations well operations. - M.: Nedra. - 1989. - S. 130].

The disadvantage of this method is the low reliability of the isolation leakage in the casing, as is the mixing of cement and squeezing the liquid.

There is a method of repair work in the production well, comprising pumping into the well a definite volume of the viscoelastic composition, the subsequent injection of cement through the column tubing with an open annular space of the well and the injection of the calculated amount of squeezing of the fluid in the closed annular space of the well, with the rise of the column tubing and abandonment of wells for the period RFQ [Copyright certificate №1620609, CL EV 33/13, publ.1991].

The disadvantage of this method is the high consumption of cement and low reliability of isolation.

There is a method of isolating the flow of formation waters in the oil and gas wells, on the expectation by the injection of the composition for selective water shutoff, characterized in that after injecting additionally upload gidrofobiziruyuschey liquid or gas to push the specified structure from the bottom of the borehole into the formation at a distance equal to the radius of the created screen, while the composition takes the form of a shell, the lower part of which in contact with water becomes impervious to the injected followed by hydrophobic liquid or gas, and the upper part is made in the well during its start-up in operation [EN 2247224, E21B 33/13, publ. 2005].

The disadvantage of this method is the use of only in wells with bottom water and can be used to isolate the supply reservoir to production wells.

There is a method of isolation of the inflow of formation water, which consists in injecting into the near-wellbore area of the formation of a mixture of lime for mining and drilling operations (ICOLD) as the composition for the selective water shutoff, while in contact with reservoir water SIGB hardens, forming a dense stone [RF Patent №2158356, CL E21B 33/138, publ.1999].

The disadvantage of this method is that to create a screen that requires a large amount of waterproofing compositions. To create a screen with a radius of 5 m and a thickness of 2 m, it takes about 30 m3of the composition. In addition to the disadvantages of this method include the difficulty in mastering the wells as a result of penetration of the LM is bone plugging in the bottomhole zone of injection waterproofing composition, as well as the reduction of oil (gas) thickness of the layer.

Known way to restore productivity and commissioning of idle oil and gas wells, including production of repair and insulation works, the opening of a productive layer in the casing and putting the well into operation [Kustyshev A. C. and others Recovery of productivity idle oil and gas wells Oil and gas: problems of natural resources management, production and transportation: proceedings of the scientific.-technology. Conf., dedicated to the 90th anniversary since the birth Century. And. Muravlenko. - Tyumen: TSOGU, 2002. - S. 112].

The disadvantage of this method when restoring the productivity of idle wells with complex built by collectors and low FES by perforating the production casing punches high power is a violation of the integrity of the cement sheath behind a column (full or partial destruction), which leads to the emergence of cross-flows of water and gas.

The known method of repair and insulation works in wells, comprising performing the priming holes in the production string, the descent filling columns with patrolsim element, the annular separation space and the injection under pressure of insulating material, filling the column impose additional pack the respective elements in the amounts, equal to the number of productive formations, and their allocation between productive layers, and separation annular space is carried out in the area of productive layers and the area of the pouring hole, and the injection under pressure of insulating material is carried out simultaneously with the separation of the annular space, the duration of which take at least equal to the duration of the injection of the insulation material [RU 2053357, publ. 1996].

There is also known a method of restoring productivity and commissioning of idle oil and gas wells, including production of repair and insulation works, the opening of a productive layer in the casing and putting the well into operation [Application 98116654/33 RF, E21B 47/00, declared 04.09.98, publ. 20.06.00. Bull. No. 17].

The disadvantage of this method when restoring the productivity of idle wells with complex built by collectors and low FES by drilling a second hole at the re-opening of the productive formation outside contamination wellbore zone (PPP) are the high cost of drilling a new hole and the low probability of its falling into the productive zone, especially in reservoirs with lenses and layers of rocks that have good enough THESS.

The closest technical solution selected is output as a prototype, is a way to restore productivity and commissioning of idle oil and gas wells, including re-opening of a productive layer in the initial interval with depth extending radially beyond the contaminated borehole zone. Subsequently produce a "gentle" perforated production string, for example, sverlyaschie punches or abrasive jet perforation, in the interval obwodnica productive part of the reservoir below the oil-water or gas-contact 1-2 meters. Pumped through the newly formed perforations of water composition, forming waterproofing screen, pushing back the water into the formation along the radius. Produce a "gentle" perforated production string below the initial perforation interval and above the oil-water or gas-contact 1-2 meters. Pumped into the annulus through the newly formed hole above the oil-water or gas-contact sealing composition, for example, a composition based on polyvinyl alcohol. To prevent cross-flows of water and gas are mounted inside a production casing cement bridge, newly formed overlying the perforations. Produce re-opening of the productive formation by "sparing the perforation of the production string in the original perforation interval with depth perforations, facing radially outside the contaminated zone. Produce stimulation, testing and commissioning of wells in operation [RF Patent №2231630 C1, IPC 7 E21B 43/00, 43/32, publ. 2004].

The disadvantage of this method is the complexity of the implementation, and that the insulating fluid can be drawn from a reservoir not only of oil but also of the saturated zone. Repair and insulation works are carried out for two chute-lift surgery, another surgery, perforation of the production string, the second insulation work.

The task, which directed the claimed technical solution is to develop effective way to restrict watagatapitusb to restore well productivity with minimal capital costs. The main objective of the invention is to create such a method for isolation and limitations of watagatapitusb using the perforation of wells with no high-explosive shells, which would be a relatively simple process provided an effective, selective isolation of watagatapitusb, eliminating leaks operational columns easily penetrating the insulating compositions, minimal contamination of the bottom zone with subsequent restoration of production wells, and to develop reliable is th way to restore productivity and commissioning of idle oil and gas wells with low FES of reservoir rocks and closely spaced KSS or GVK.

When carrying out the claimed technical solution the problem is solved at the expense of achieving a technical result, which is to ensure reliable recovery of productivity and injectivity of wells, to increase the efficiency of isolation of formation waters, the cheapening of the production process, minimum pollution of bottom-hole zone of the well and reducing the time it was the subsequent development of oil-saturated interval of the formation.

This technical result is achieved by the fact that in the known method of limiting watagatapitusb with the restoration of the productivity of the wells, including the descent on the column tubing perforator, perforated casing, insulation, water or watagatapitusb and elimination of leaks casing in any interval or multiple intervals in the wellbore by pumping through the newly formed hole insulating composition, forming a water screen, a feature is that the perforated production casing, the injection of the insulating composition is carried out during one descent-ascent of the punch, which is used as a mechanical-hydraulic hammer, designed to make holes in the production string and pumping through them isolated the respective compositions the perforated production string is carried out in the interval of water or getprotocol. In addition, you can use as an insulating composition for insulation of water or watagatapitusb and eliminate leaks casing karbomidoformaldegidnogo resin. After injection of the insulating composition in the aquifer may conduct additional perforation of oil-saturated interval.

The method is as follows.

Initially, geophysical research set the interval of water inflow to the reservoir or the behind-the-casing flows of water from the underlying water - or gas-bearing formations, the position of the oil-water contact (OWC) or gas-oil contact (GOC) in concrete production well. In the hole down at the pump-compressor plant pipes (tubing) hydro-mechanical perforator, for example a slit, piercing, milling, connectors, allowing the formation of channels in the production string. Geophysical method is to bind to the desired interval of the reservoir, which will connectors are opening well equipped with production/casing. Are at least two punctures due to the pressure of the liquid column up to 15 MPa, each hole is formed in the production string of size 16×50 mm is here indentation in the wall of the pipe connectors cutters with effort, exceeding the yield strength. The perforations create, if necessary, every 20-30 cm with the movement of the punch from the bottom up.

At the same time through a jet nozzle, which is equipped with hydro-mechanical perforator, and formed hole high-speed stream of fluid under high pressure is produced in the alluvium of the channels in the bottomhole formation zone of the well.

Determine the acceleration of the reservoir through the perforator, the pickup should be at least 100 m3/day at a pressure of 10 MPa. In the absence of injectivity produce, for example, acid effects right through the perforator with the injection of acid into the formation to create the pickup.

The next stage carry out the injection of the insulating composition, for example, on the basis of urea-formaldehyde resin (UFR). Original composition for pipe space is brought to the annular reservoir in fluid circulation, then the annulus is closed and the insulating composition is forced directly into the reservoir through the jetting nozzles punch with displacement with water. Chemical composition remains on solidification at a certain time, depending on the amount of hardener and reservoir temperature.

After the hammer raised to metanational interval of the reservoir and produce an additional puncture is with the silting of the channel layer for filtering the liquid.

Dropping the ball in the tubing, creating pressure on the mouth and open the circulation valve, which allows circulation of the annular pipe. Spend the injection of chemical compounds through the tube space, through the perforator into the reservoir. Then hold swabbing with removing the reaction products and the stimulation of the formation.

In the absence of the necessary inflow of metanational layer layout with a hammer up above. After solidification of the insulating composition and lift perforator produce descent, for example, wave giant with a packer and a jet pump, hold interval cleaning perforations in metanational interval with the creation of pulsating pressure fluctuations. After planting, the sealing packer and implement the development of the jet pump to create pressure on the borehole bottom.

The proposed method is selective sparing of perforation and vodohozyaistvennyh works with a subsequent call flow of oil from the reservoir swabbing, compression with chemical, acoustic, wave methods does not require the installation of a cement bridges and packer device to overlap the existing perforations, selective injection of the insulation composition for restrictions watagatapitusb, liquidas and leaks on the columns directly in the desired interval of the reservoir via gentle punctures/holes/slits in the production string and jetting nozzles in one descent-ascent of the punch.

Thus, isolation watagatapitusb and elimination of leaks casing carried out immediately after perforation without additional tripping. Applied chemicals do not come into contact with the production column and directly affect the aquifer, without pollution neftyanykh intervals.

1. Method of restricting watagatapitusb with the restoration of the productivity of the wells, including the descent on the column tubing perforator, perforated casing, insulation, water or watagatapitusb and elimination of leaks casing in any interval or multiple intervals in the wellbore by pumping through the newly formed hole insulating composition, forming a water screen, characterized in that the perforated production casing, the injection of the insulating composition is carried out during one descent-ascent of the punch, which is used as a mechanical-hydraulic hammer, designed to make holes in the production string and pumping through them, insulating compositions, the perforated production string is carried out in the interval of water or getprotocol.

2. The method according to p. 1, characterized in that as a isolated who tried compositions for isolation of water - or watagatapitusb and the elimination of leaks on the production string use karbomidoformaldegidnogo resin.

3. The method according to p. 1, characterized in that after the injection of the insulating composition in the aquifer produce additional perforation of oil-saturated interval.



 

Same patents:

FIELD: oil and gas industry.

SUBSTANCE: method includes the conducting of repair and insulating works, "moderate" perforation of the production casing by a power drill with the working member equipped with hydromonitor channels, injection of sealing composition into the punched holes, bridge installation inside the production casing and subsequent re-perforation and development of the productive formation. Meanwhile during a single tripping of the perforator "moderate" perforation of the production casing is made in the interval below the productive formation and above the water producing formation. A simultaneous sealing of the formed holes of the interval and the bridge installation inside the production casing by means of supply of cementing composition through the perforator are performed. The perforator is backwashed when it is lifted to the productive formation, which is re-perforated and developed by the same perforator.

EFFECT: saving of time and resources for the method implementation at the expense of execution of several actions in one tripping.

FIELD: oil and gas industry.

SUBSTANCE: method includes running in of a flexible coiled tubing, filling of the well with blocking fluid in the interval from the bottomhole up to the lower part of water influx closest to the bottomhole. Water-shutoff compound is injected and flushed to the producing formation with simultaneous running out of the flexible coiled tubing up to the upper part of water influx closest to the bottomhole. At that the rate of the well horizontal section should be several times more than the rate of the flexible coiled tubing movement in order to ensure even placement of water-shutoff compound in the producing formation. The well horizontal section is filled with blocking fluid up to the next water influx shutoff interval and isolation works are performed in sequence at each influx interval starting from the interval closest to the bottomhole. Upon isolation of the last water influx the well is closed under pressure for reaction of water shutoff elements and destruction of the blocking fluid. Thereafter the flexible tubing is run in up to the bottomhole and the well is washed in volume of at least 2 circulation cycles.

EFFECT: increased shutoff efficiency of brine water influx in horizontal wells both with cased bottomhole and open bottmhole with a slotted liner or without it.

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FIELD: oil and gas industry.

SUBSTANCE: invention is related to oil and gas industry, and namely to shutoff of stratal water influx in gas and gas condensate wells by means of coil tubing technique. The concept of the invention is as follows: the method lies in running in of a flexible pipe into inner cavity of gas-well production tubing up to the bottomhole and cleanout of the bottomhole from liquid and mechanical impurities, filling of the well with gas condensate, subsequent lifting of the flexible pipe up to tubing shoe, injection to the perforated interval through annular space between the flexible pipe and production tubing of the first package of hydrophobisated compound containing ethyl silicate ETC-40 with 10% concentration in gas condensate with volume of 1-2 m3 per each meter of gas net pay with its further flushing to the stratum and formation of water shutoff screen in the productive stratum thus pushing stratal water out from the bottomhole to the stratum depth radially. Then through annular space between the flexible pipe and production tubing injection of the second package of hydrophobisated compound is made containing ethyl silicate ETC-40 with 100% concentration in volume of 0.4-0.6 m3 per each meter of gas net pay with its further flushing to the stratum by gas condensate in the volume of production tubing and inner space of the well - production string below the tubing shoe. Then running in of a flexible pipe is repeated to the interval of gas-water contact, water-repellant organosilicon liquid GKZH-11N is injected through the flexible pipe in volume of 0.10-0.15 m3 per each meter of water-bearing thickness of the stratum, return washing of the well during 2 cycles with back pressure. The flexible pipe is removed from the well; the latter is withheld for reaction under pressure.

EFFECT: potential shutoff of stratal water influx without well killing operation and maintenance of gas net pay.

3 ex, 4 dwg

FIELD: oil and gas industry.

SUBSTANCE: according to the method the well is killed, the sand plug is washed and hydraulic fracturing of the formation is made with its simultaneous setting within the whole perforation interval. Volume of the well bottomhole zone within the perforation interval is divided into two production facilities by injecting and flushing of waterproofing compound to the formation depth radially thus forming water shutoff screen. Time is withheld for hardening of the waterproofing compound. The well volume at the water shutoff screen level is divided into two production zones by setting a packer run in with the tubing string. The tubing string is equipped with a gas lift valve in the upper part of the upper facility perforation interval. The string shoe is set at the level of 1.5-2m below the lower openings in the lower facility perforation interval and water extraction is made by intrawell gaslift from the lower production facility due to gas energy from the upper production facility.

EFFECT: improved productivity of wells due to recovery of wet gas or gas condensate wells, prevention of their further drowning and self-killing, increased life between overhauls.

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FIELD: oil and gas industry.

SUBSTANCE: group of inventions is related to downhole devices for instillation in the well bore in the underground area and methods of flow regulation in the well bore. Technical result lies in effective regulation of fluid flow. The downhole device for instillation in the well bore in the underground area contains the first fluid diode having the first inner surface limiting the first inner chamber and output of the first inner chamber, at that the first inner surface facilitates fluid swirling when it is directed to the output; and the second fluid diode having the second inner surface limiting the second inner chamber in fluid communication with the above output, moreover the second inner surface facilitates fluid swirling when the swirling fluid is received through the above output. In the method of flow regulation in the well bore in the underground area fluid is transferred through the first fluid diode and the second fluid diode through the channel between inner space of the downhole device and its outer space in the underground area.

EFFECT: while transferring fluid through the first and second fluid diodes fluid swirling is ensured in the first and second fluid diodes.

18 cl, 6 dwg

FIELD: oil and gas industry.

SUBSTANCE: group of inventions is related to mining engineering and may be used for regulation of fluid inflow to the well. The system contains a flowing chamber through which a multicomponent fluid passes, at that this chamber contains at least one input, one output and at least one structure spirally located in regard to the output and thus facilitating helical swirling of the multicomponent fluid flow around the output. According to another version the system contains a flowing chamber with the output, at least one structure facilitating helical swirling of the multicomponent fluid flow around the output and at least one structure preventing redirection of the multicomponent fluid flow to radial trajectory passing towards the output.

EFFECT: prevention of gas cone and/or water cone formation around the well.

24 cl, 5 dwg

FIELD: oil-and-gas industry.

SUBSTANCE: invention relates to control over flow resistance in the well. Proposed device has the surface making the chamber and including lateral and opposite end surfaces. Note here that maximum distance between opposite end surfaces is smaller than maximum length of opposite end surfaces. It has first opening in one of end surfaces and second opening in said surface, isolated from first opening. Note here that lateral surface serves to swirl the flow from second opening to circulate around first opening.

EFFECT: higher efficiency of in-well fluid resistance adjustment.

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FIELD: oil and gas industry.

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EFFECT: effective control of fluids flow.

10 cl, 6 dwg

FIELD: oil and gas industry.

SUBSTANCE: method includes pumping and flushing of the polymer solution and well shutdown for the period of polymer gelling. According to the invention geophysical survey is made in order to specify the interval of water influx. Computational experiments are made on the basis of water influx isolation and limitation mathematical model thus evaluating stability of polymer screens for different viscosity and volume of polymer solutions in oil- and water-bearing areas of the productive stratum at the limit depression and depression in service, residual water and oil resistance factors for injected polymer solutions considering type of the productive stratum as well as water cut of the produced oil and its flow rate after insulation and limitation of water influx. At that viscosity of polymer solutions are evaluated in time at temperature of the productive stratum. Then the polymer is selected with required viscosity and volume of injection ensuring stability of the screen based on the above polymer in oil-bearing area of the productive stratum. The selected polymer solution is injected in the calculated volume.

EFFECT: increased efficiency of the method.

2 cl, 4 dwg, 1 tbl

FIELD: oil and gas industry.

SUBSTANCE: operation method for a well placed in oil-water contact zone contains the stages at which the well is perforated in the oil-containing area of the stratum and water-containing area of the stratum; dual product extraction is arranged from the oil-containing area and water-containing area of the stratum through the above perforation with the controlled rate; at that well production rate is controlled and equipment is selected for production on the basis of the certain ratio and periodically changed physical and chemical and reservoir properties.

EFFECT: improvement of efficiency and reliability for operation of wells placed in the oil-water contact zone.

3 cl, 3 dwg

FIELD: mining.

SUBSTANCE: perforator comprises pusher-piston, cutting section including working piston with extending cutting disc with its drive to interact with deflecting wedge. Working piston is fitted in working cylinder, cylinder wall being provided with a through lengthwise cut-out opposite said cutting disc. Cutting sections are arranged one after the other. Their working pistons are driven by pusher-piston in one direction and by return spring in opposite direction. Return cylinder piston rod slides inside the spring, cylinder body being engaged with working cylinder. Return cylinder cover has central bore for rod to run there through and circular radial ledge. The latter serves to lock the cover against axial displacement between working cylinder end and inner circular groove made in return cylinder body.

EFFECT: ruled out emergencies, safe return of cutting tool to transportation position.

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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: method includes the conducting of repair and insulating works, "moderate" perforation of the production casing by a power drill with the working member equipped with hydromonitor channels, injection of sealing composition into the punched holes, bridge installation inside the production casing and subsequent re-perforation and development of the productive formation. Meanwhile during a single tripping of the perforator "moderate" perforation of the production casing is made in the interval below the productive formation and above the water producing formation. A simultaneous sealing of the formed holes of the interval and the bridge installation inside the production casing by means of supply of cementing composition through the perforator are performed. The perforator is backwashed when it is lifted to the productive formation, which is re-perforated and developed by the same perforator.

EFFECT: saving of time and resources for the method implementation at the expense of execution of several actions in one tripping.

FIELD: oil and gas industry.

SUBSTANCE: device for making perforation tunnels in a well which is installed at the casing string includes a body, a wedge with groove, a hydraulic cylinder and at least one operating device with jet tunnel placed at the support groove and the wedge with potential radial reciprocative movement. The wedge is installed above a piston of the hydraulic cylinder where the support of the operating device is fixed and the cavity below the piston is communicated by means of tubes with jet tunnel of the operating device and the cavity over the cavity of the operating fluid delivery.

EFFECT: manufacturing of small-size device that provides increase in reliability and efficiency of the productive formation processing with reduction of material costs.

4 dwg

FIELD: oil and gas industry.

SUBSTANCE: device contains a case, wedge with grooves, at least two hydraulic motors placed one by one which have spring-loaded pistons and at least two cutters with hydraulic monitors and cutter holders installed in grooves of its support and wedge and capable of radial reciprocating movement. The case is formed by the wedge and walls of hydraulic motors which piston rods have axial channel connected by overflow channels with cavities under pistons and by tubes and channels of cutter holders with hydraulic monitors of cutters. Support of cutter holders is connected to piston rod which is loaded by a spring downwards in regard to the hydraulic motor.

EFFECT: improvement in efficiency of productive stratum treatment at reduction of metal consumption and material costs.

1 dwg

FIELD: oil and gas industry.

SUBSTANCE: device includes hydraulic motor and carriage with axial movement drive all located in cylindrical housing, at the carriage there mounted are hydraulic monitor and mechanism of exit cutting in cased borehole with end mill tool that has rotating drive from hydraulic motor and axial movement via hydraulic cylinder, mechanism of housing fixing in cased borehole, operating fluid supply line and hydraulic control system. Hydraulic monitor is mounted in unit that has, at least, one hydraulic monitor, and at the carriage diametrically relatively hydraulic monitor unit and exit cutting mechanism there additionally mounted are hydraulic monitor unit and exit cutting mechanism. Both exit cutting mechanisms are mounted in carriage guides and hydraulic cylinder of axial movement of their end mill tools is mounted on exit cutting mechanisms and is made two-piston. Drive shaft of hydraulic motor is kinematically connected to worm-and-worm gear, on the leading screw of which there is a carriage mounted via nut fixed on it, and to driving sprocket engaged by chain gearing through following sprocket with driving sprocket that is mounted on end mill tools spindles.

EFFECT: increasing of production rate at reduction of operation costs.

2 dwg

FIELD: oil and gas production.

SUBSTANCE: perforator comprises a hollow body comprising separate sections with jet attachments. For connection of sections a perforator is equipped with spacers of a different length and couplings. The connection is made as a butt joint by means of couplings arranged from outside, and the connection ends of couplings, spacers and each section are arranged with the right and left threads.

EFFECT: higher reliability and durability of sand jet perforator operation, reduction of its dimensions, making it possible to use it in casing strings of a smaller diameter, in casing strings of a larger diameter with a complex profile.

1 dwg

FIELD: oil and gas production.

SUBSTANCE: centring skid for a sand jet perforator comprises a hollow body, a pusher and fixator levers installed in it on axes as capable of rotation. At the same time in the lower part of the body there is a piston spring-loaded at the bottom, the pusher contacts with the piston and the fixator lever, which represents a double-arm lever. The double arm lever is installed on the axis fixed in the body. One arm of the lever contacting with the pusher has a shaped curvilinear surface, and the second arm has an extended part capable of interaction with a casing string, and the opposite end of this arm - with the side cylindrical surface of the pusher. The pusher is installed in the body via a bushing by means of rubber rings with alternation of fitting along external and internal diameters. Section weakening is arranged in the area of transition between one arm of the lever into the second one.

EFFECT: device finds largest application during opening of beds in wells of complicated shape and horizontal, inclined wells.

1 cl, 2 dwg

FIELD: oil and gas industry.

SUBSTANCE: nozzle for hydraulic jet perforator includes housing with a lug and hard-alloy jet insert with variable cross section hole; at that, nozzle is equipped with protective nut, and connecting thread for connection to protective nut is made on external part of the housing lug.

EFFECT: increasing service life of hydraulic jet perforator, namely increasing service life of the housing.

1 dwg

FIELD: oil and gas industry.

SUBSTANCE: invention is related to oil producing industry, and namely to methods of water influx limitation in oil producers and alignment of injectivity profile in injectors. Procedure for selective shutoff of water-encroached sections of oil reservoir includes injection of gel-forming compound to the reservoir, flushing of the above compound to the reservoir and break in the process. At that 5-20 wt % of sodium metasilicate to the above compound and 3-9 wt % of chromic potassium alum as the initiator of gel-forming process and water up to the remaining volume. In 3-4 hours upon injection of water shutoff compound injection of alkali solution is performed in order to recover permeability of oil-saturated intervals. Then break in process is taken for 12-18 hours, thereafter operation of the well is started again.

EFFECT: reduction in associated water production due to shutoff of producers or increase in oil recovery efficiency due to growth of sweep efficiency and connection of oil-saturated and low-permeable interlayers due to redistribution of injected water flows during treatment of injectors.

1 ex, 1 tbl

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