RU2459944C1 - Method for initiating inflow from formation and device for its implementation - Google Patents

Abstract

FIELD: mining.

SUBSTANCE: method includes descending the cylinder into the hole by string, the cylinder has radial holes covered by valve unit due to connection to string in transport position, packer and circulation valve mounted before the packer for connection to the tubular annulus, sealing of tubular annulus by packer above the formation, decreasing fluid level in tubing string and tubular annulus for creation of differential pressure drawdown, opening valve unit. Level reduction in tubing string and tubular annulus is done via pumping of gassy fluid through flexible pipe preliminary descended into string till the interaction with circulation valve that is opened in transport position for connection to tubing string and tubular annulus. Valve unit capable of fluid inflow from formation with string in transport position is opened after creating differential pressure drawdown and circulation valve is closed. After that the formation undergoes acid treatment with the following process holding. Then flexible pipe is descended into the string, gassy fluid is pumped into the string to decrease the fluid level in it and create differential pressure drawdown with carrying out the product of acid reaction with formation solid. The device includes packer connected to the string, wellhead fittings with branches hydraulically connected to the tubing string and tubular annulus of string, cylinder with radial holes mounted under the packer, the holes are covered in transport position, valve unit performed in a form of piston fixed in the cylinder in upper position and circulation valve located above the packer performed in a form of sleeve with lower end stop and side holes capable of closing by hollow bush fixed in upper position by shear elements. The device is equipped with flexible pipe descended into tubing and capable of interacting with hollow bush after creation of differential pressure drawdown for its movement till the end stop with closing the side holes open in transport position. Radial holes of the cylinder are closed in transport position by piston fixed in the upper position by decomposable elements and capable of opening the radial channels at movement downwards. The piston is additionally equipped with valve passing the fluid upwards.

EFFECT: simplification of inventions and adjustment of differential pressure drawdown value in the course of well development.

2 cl, 4 dwg

Description

The invention relates to the mining industry, in particular to the processes of well development.

There is a method of causing inflow from the reservoir (V. Amiyan and others. The opening and development of oil and gas reservoirs. 2nd ed. Revised and add. - M .: Nedra, 1980, p. 286.), Including a sequential descent into the well tubing (tubing) with start-up couplings installed at a distance from each other and at depths, providing the ability to push the gaseous agent at maximum compressor pressure, strapping wellhead fittings, injecting gaseous agent into the tubing and purging the annulus through the start-up clutch .

It is also known a device (Amiyan V.A. and others. The opening and development of oil and gas reservoirs. 2nd ed. Revised and add. - M .: Nedra, 1980, p.286.) For implementing this method, including a tubing string, starting couplings installed on the tubing and wellhead fittings with a fitting in the branch, hydraulically connected with the annulus of the well.

The disadvantages of this method and device for its implementation are:

- firstly, in the process of injecting a gaseous agent, the displaced well fluid enters not only the tubing, but also partially goes into the reservoir, which will worsen the filtration characteristics of the reservoir;

- secondly, the decrease in the level even in small portions still occurs rather sharply, which can cause a number of complications, for example, a breakthrough of the upper and lower waters, the destruction of a weakly cemented bottom-hole formation zone, etc.

Also known is a method of developing a well by creating a depression on the formation (patent RU No. 2272897, IPC 8 E21B 43/18; B 43/27, published in Bulletin No. 9 of 03/27/2006), which includes replacing the fluid filling the well with a solution a surfactant with its subsequent aeration by feeding a blowing agent in the form of ammonium carbonate into the well, while before feeding the blowing agents, the bottom-hole zone is subjected to acid treatment with the sale of acid into the formation, and aqueous solutions of nitrate are additionally used as blowing agents atria NaNO ₂ and hydrochloric acid HCl; aqueous solutions of blowing agent reagents are injected in doses of 0.5-2.0 m ³ in the following sequence: ammonium carbonate, hydrochloric acid, sodium nitrite, with each subsequent solution having a density higher than the previous one, the volume of injected reagents is 0.3- 1.0 volume of the well, but not less than 1.1 of the internal volume of the pressure column, and is determined by the useful volume of the well, and the surfactant solution additionally contains hollow glass microspheres.

The disadvantages of this method are:

- firstly, the surfactant solution is aerated directly in the well by supplying gas-forming substances to the bottomhole zone of the well, while the sequence of chemical reactions and the temperature regime can change, which can lead to a change in the physical and chemical properties of the replacement fluid, including decomposition carbonated liquid for gas and water, which generally reduces the success of well development;

- secondly, it is impossible to effectively develop formations with a contaminated bottomhole zone, especially if these contaminants penetrated deep into the formation, since for their successful development, in addition to acid treatment, it is necessary to significantly increase the amount of depression on the formation.

The closest in technical essence is the method of causing inflow from the reservoir (patent RU No. 2065948, IPC 8 E21B 43/25, published in Bulletin No. 24 of 08/27/1996), which includes sequential descent into the well on tubing ( without adding fluid) perforated liner, valve assembly and packer, wellhead fittings, seal the annulus of the well with the packer and at the wellhead, adding tubing to the process fluid and opening the valve assembly to create a depression on the formation, characterized in that in the process of lowering the tubing above the packer install a circulation valve, which is placed at a depth that allows the gaseous agent to be purged at the maximum pressure of the compressor, and in the process of tying the wellhead fittings, a bypass valve is installed hydraulically connected to the pipe space, while adding process fluid to the pump -compressor pipes are carried out to a level below the circulation valve, after which the working agent is pumped with the maximum possible pressure, and d by opening the valve assembly, the pipe space is closed, after which the pressure in the pipe space is periodically released through the bypass valve until the gaseous agent is completely discharged, the circulation valve is opened, the gaseous agent is pumped into the pipe space and the annulus is blown through the circulation valve, then the annulus at the mouth is closed and a gaseous agent is re-injected into the pipe space at the maximum possible pressure, after which it is periodically through the bypass valve The plates release pressure until the gaseous agent is completely discharged from the pipe space.

In addition, a device for implementing this method, including associated with the tubing, a mechanical packer, wellhead fittings with bends hydraulically connected respectively to the pipe and annular spaces of the tubing, a cylinder installed beneath the packer with a radial hole, a valve assembly made in the form of a locking element fixed in the cylinder, overlapping the radial hole of the cylinder, and made under the valve assembly landing cone in which the piston is installed the perforated shank connected to the cylinder, and it is equipped with an additional outlet of the wellhead fittings with a bypass assembly connected to the cavity of the tubing made in the form of a pipe segment with valves on its two sides, and a pressure gauge attached inside the wellhead fittings with a reset pin, and a circulation valve mounted on tubing above the packer, made in the form of a coupling with an end stop and side openings blocked by the cp fixed in the highest position with a bushing with a seat with a seat for a ball being thrown, the bushing being mounted with the possibility of axial movement to the end stop of the coupling, the locking element of the valve assembly is made in the form of a hollow shear bolt, the piston cylinder cavity is hydraulically connected to the cavity of the perforated shaft, the piston diameter is smaller than the inner diameter perforated shank, which has an annular stop at the bottom for landing the piston, and the mass of the pin exceeds the friction force holding the piston in the cylinder.

The disadvantages of this method and device for its implementation are:

- firstly, the complexity of the design of the device and the technological process of its implementation, in connection with which the material costs for the manufacture of the device and financial costs for its implementation increase;

- secondly, after unpacking the packer, the fluid that is in the well during the inflow from the reservoir in the overpacker space flows back into the reservoir, and therefore the quality of the inflow (development) of the reservoir deteriorates, i.e. reservoir properties of the bottom-hole formation zone (PZP) are reduced;

- thirdly, when developing the reservoir with a compressor, i.e. gas injection into the pipe string, additional back pressure is created on the formation, as a result of which the liquid is absorbed by the formation, its level in the well decreases;

- fourthly, the inability to perform acid treatment of the contaminated bottom-hole formation zone immediately after the inflow is called.

The objective of the invention is to simplify the design of the device and the process of implementing the method with the ability to call the inflow from the formation with carbonated liquid of the estimated density, which allows you to adjust the amount of depression on the formation during the development of the well, as well as reducing the hydraulic pressure that occurs in the process of replacing the fluid in the well with the possibility of effective development formations with acid-contaminated bottom-hole zone, and also improve the quality of development by eliminating I well fluid from nadpakernogo space.

A method for causing inflow from a formation, including a descent into a well on tubing of a cylinder with radial holes blocked from communicating with the tubing in the transport position by the valve assembly, the packer and the circulation valve packer installed above to communicate with the annulus, sealing the annulus space packer above the reservoir, reducing the level of fluid in the pipe and annular spaces to create depression on the reservoir, opening the valve assembly.

New is that the decrease in the level in the pipe and annular spaces is carried out by injection of carbonated liquid through a flexible pipe that is previously lowered into the tubing before interacting with the circulation valve, which is open in the transport position for communication of the pipe and annular spaces, a valve assembly configured to supply fluid from the formation with tubing in the transport position, open after creating depression on the formation, and the circulation valve is closed, after which the acid treatment of the formation with leduyuschey exposure process, then lowered in the tubing a flexible tube, carbonated liquid is pumped into the tubing to reduce the liquid level therein and create drawdown with the removal of acid production reaction with the rock formation.

As well as a device for implementing the method, including a packer connected to the tubing, wellhead fittings with bends hydraulically connected to the tubing and annular tubing spaces, a cylinder installed under the packer with radial openings blocked in the transport position, a valve assembly made in the form of a piston fixed in cylinder in the upper position, and the circulation valve located above the packer, made in the form of a coupling with a lower end stop and side openings made with the possibility of overlapping the polo th sleeve fixed in the upper position by shear elements.

New is that it is equipped with a flexible pipe, lowered into the tubing and made with the possibility of interaction after creating a depression on the formation with a hollow sleeve to move it to the end stop with overlapping side holes open in the transport position, and the radial holes of the cylinder are closed in the transport position a piston fixed in the upper position with destructible elements and configured to open radial channels when moving downward, and the piston is additionally equipped with a valve Let upwards.

Figure 1 shows the ground part of the device and method of causing inflow from the reservoir.

Figure 2, 3, 4 shows a sequential diagram of the underground part of the device and method for causing the influx from the reservoir.

The method of causing inflow from formation 1 (see Fig. 2) includes descent into well 2 on tubing 3 of cylinder 4 with radial holes 4 ', blocked from communication with tubing 3 in transport position by valve assembly 5, of packer 6 and the above-installed packer 6 of the circulation valve 7 for communicating the tube space 8 with the annular space 9.

Packer 6 seals the annulus 9 above the formation 1, with the lower end of the tubing string 3 being placed at the level of the bottom of the formation 1, and packer 6, for example, of mechanical action of the PRO-YAMO brand produced by the PAKER NPF (Oktyabrsky, Republic of Bashkortostan, Russia) is installed 5-10 meters above the top of the formation 1.

At the wellhead, a strapping is performed, as shown in FIG. 1, of a gas booster unit 10, for example, UNG-8/15 (operating manual 5859-0000010 RE), intended for the preparation of carbonated liquid with a calculated density with a tanker 11 filled with process liquid.

Technological liquid in the form of a 0.1% aqueous solution of ML-81B surfactant is delivered to well 1 in tank trucks 11 with a total volume depending on the time and volume of injection of carbonated liquid into well 1, for example, at least 20 m ³ .

The wellhead 12 of the well 2 is tied with a gutter system 13, as well as the Coiled Tubing 14, designed to lower the flexible pipe (GT) 15 into the tubing string 3 (see FIGS. 1 and 2).

Next (see FIG. 2), GT 15 (see FIGS. 2 and 4) is introduced into the pipe space 8 of the tubing string 3 through a central hole (not shown in FIG.) In the wellhead 12 of well 1 (see FIGS. 2 and 4) until the lower end 16 GT 15 does not reach interaction with the circulation valve 7, after which GT 15 is raised by 1-2 m.

Using a gas booster unit 10 at the wellhead 2, the process fluid is aerated until the required volume of carbonated liquid is obtained and the gas booster unit 10 is brought into the development mode, having obtained a carbonated liquid of calculated density at the outlet.

After that, carbonated liquid is injected from the gas booster unit 10 via the discharge line 17 into the GT 15, while the circulation valve 7 is open in the transport position, i.e. its side openings 18 communicate the tube 8 and the annular space 9.

Thus, by injection of carbonated liquid into GT 15 (see FIG. 2), the liquid level is reduced in the pipe 8 and annular 9 spaces, while the displaced liquid located in the pipe 8 and annular 9 spaces is displaced into the groove system 13 through lateral outlets wellhead valves 12 (see figure 1), while the valve assembly 5 (see figure 2) eliminates the ingress of both displaced well fluid and displacing aerated fluid into the reservoir 1.

The pressure on the discharge line 17 of the booster installation during the injection of carbonated liquid should not exceed 18 MPa, since this leads to the operation of the gas booster installation 10 at maximum speed and can lead to failure, while reducing pressure, if the above value is reached pressure, increase the volume of the supply of process fluid from the tanker 11 to the booster unit 10 and reduce the volume of gas supply by the compressor (not shown in Fig.), i.e. increase the density of the gas-liquid mixture, pump second in GT 15.

When the fluid level drops to a certain level, the valve assembly 5 (see FIG. 2), in the transport position, configured to supply fluid from the formation with tubing 3, starts to pass fluid through itself. As a result, depression is created on formation 1, inflow from formation 1 is caused, and bottomhole zone pollution is carried away mainly through the tubing space 8 of the tubing string 3 and partly along the annular space 9 into the groove system 13, while the contamination is visually observed in the groove system 13. The injection of carbonated liquid into GT 15 is continued for 2-3 hours.

Then stop the injection of carbonated liquid in the GT 15. Next, the circulation valve 7 by unloading the GT 15 is closed (see figure 3) and the GT 15 is removed from the well 2. Next, the acid treatment of the formation 1 is performed.

Moreover, the acid treatment is carried out depending on the type of reservoir of reservoir 1 as follows.

To treat carbonate reservoirs, a solution of inhibited hydrochloric acid (according to TU 2458-017-12966038-2002) is pumped into reservoir 1 at the rate of 0.8-1.5 m ³ per 1 m of the thickness of the reservoir.

To treat terrigenous reservoirs, clay solution (according to TU 02-1453-78) is pumped into formation 1 at the rate of 0.4 to 0.6 m ^{3 of} solution per 1 m of formation thickness.

An acid treatment of the formation 1 is performed, and initially, by injection of the acid solution in the tubing string 3, the pressure is raised, for example, to a value of 6 MPa, while the shear screws 19 of the valve assembly 5 are destroyed and it occupies an operating position, while the radial holes 4 'of the cylinder 4 open and formation 1 communicates with the pipe space 8 of the tubing string 3.

Next, an acid solution is injected through the tubing string 3 with its injection into the formation 1 with a process fluid through an acid aggregate (not shown in Fig. 1), after which a technological pause is maintained, for example, for 12 hours for the acid to react with the formation rock 1.

Then, the flexible pipe 15 (as described above) is again lowered into the tubing string 3 (see FIG. 4) until the lower end 16 of the GT 15 reaches interaction with the circulation valve 17, after which the GT 15 is raised by 1-2 meters .

Using a gas booster unit 10 at the wellhead 2, the process fluid is aerated until the required volume of carbonated liquid is obtained and the gas booster unit 10 is brought into the development mode, having obtained a carbonated liquid of calculated density at the outlet.

After that, carbonated liquid is pumped from the gas booster unit 10 via the discharge line 17 to the GT 15, while the circulation valve 7 is closed, i.e. its side openings 18 separate the pipe 8 and the annular space 9.

Thus, by injection of carbonated liquid into GT 15, a liquid level is reduced in the pipe 8 space, while the displaced liquid located in the pipe 8 space is displaced into the groove system 13 through the wellhead 12. When the liquid level drops to a certain level, the valve assembly 5 ( see Fig. 4), in the working position, configured to inflow fluid from the formation with tubing 3, begins to pass fluid through itself.

As a result, depression is created on reservoir 1, an inflow from reservoir 1 is called up with the removal of the reaction products of acid with the formation 1 rock, reaction products are carried along the pipe space 8 of the tubing string 3 into the groove system 13, while the reaction products are visually output in the groove system 1 The injection of sparkling liquid into GT 15 is continued for 2-3 hours. After that, the injection of sparkling liquid into GT 15 is stopped. Next, GT 15 is removed from the pipe space 8 of the tubing string, then the packer 6 is unpacked and removed from the well 2 together with the tubing string 3. Determine the supply and production capabilities of reservoir 1, equip the well 2 with operational equipment and put into operation.

The device for implementing the method includes a packer 6 connected to the tubing string 3 (see FIGS. 1, 2, 3, 4), wellhead fittings 12 with bends hydraulically connected to the pipe 8 and annular spaces 9 of the tubing 3, cylinder 4 installed under the packer 6 with radial holes 4 ', blocked in the transport position, and a valve assembly 5 made in the form of a piston 20, fixed in the cylinder 4 with shear screws 21 in the upper position, and a circulation valve 7 located above the packer 6, made in the form of a coupling with a lower end stop 22 and side holes iai 18, made with the possibility of overlapping the hollow sleeve 23, fixed in the upper position by shear elements 25.

The device is equipped with a flexible pipe 15, lowered into the tubing 3 and made with the possibility of interaction after creating a depression on the formation 1 with a hollow sleeve 23 to move it to the end stop 22 with the overlapping side holes 18 open in the transport position.

The radial holes 4 'of the cylinder 4 are blocked in the transport position by a piston 20, fixed in the upper position by destructible elements 24 and configured to open the radial holes 4' when moving downward, and the piston 20 is additionally equipped with a valve 25, passing from the bottom up.

The proposed device operates as follows.

A string of tubing (tubing) 3 (see FIGS. 2, 3, 4) with a packer 6 is lowered into the well, a packer 6 of any known construction is planted (for example, the mechanical action of the PRO-NMO axial fit manufactured by the scientific and production company " Packer »Oktyabrsky, Republic of Bashkortostan, Russian Federation) 5-10 m above the top of formation 1, ie seal the annulus 9 of the tubing string 3 above the packer 6, and the lower end of the tubing string 3, where the valve assembly 5 is located, should be located at the level of the bottom of the formation 1.

At the wellhead, a strapping is performed, as shown in Fig. 1 of a gas booster unit 10, for example, UNG-8/15 (operating manual 5859-0000010 RE), intended for the preparation of carbonated liquid with a calculated density with a tanker 11 filled with process liquid.

Technological liquid in the form of a 0.1% aqueous solution of ML-81B surfactant is delivered to well 1 in tank trucks 11 with a total volume depending on the time and volume of injection of carbonated liquid into well 1, for example, at least 20 m ³ .

The wellhead 12 of the well 2 is tied with a gutter system 13, as well as the Coiled Tubing 14, designed to lower the flexible pipe (GT) 15 into the tubing string 3 (see FIGS. 1 and 2).

Next (see figure 2) in the pipe space 8 of the tubing string 3 through the Central hole (figure 1, 2, 3, 4 is not shown) in the wellhead 12 of the well 1 enter GT 15 (see figure 2 and 4) until the lower end 16 of the GT 15 reaches interaction with the hollow sleeve 23 of the circulation valve 7, after which the GT 15 is raised by 1-2 m.

Using a gas booster unit 10 at the wellhead 2, the process fluid is aerated until the required volume of carbonated liquid is obtained and the gas booster unit 10 is brought into the development mode, having obtained a carbonated liquid of calculated density at the outlet.

After that, a carbonated liquid of the calculated density is pumped from the gas booster unit 10 via the discharge line 17 to the gas turbine 15, while the circulation valve 7 is open in the transport position, i.e. its side openings 18 communicate the tube 8 and the annular space 9.

Thus, by injection of carbonated liquid into GT 15, a liquid level is reduced in the pipe 8 and annular 9 spaces, while the displaced liquid located in the pipe 8 and annular 9 spaces is displaced into the groove system 13 through the lateral branches of the wellhead 12 (see Fig. .1), while the valve assembly 5, made in the form of a piston 20 (see figure 2), eliminates the ingress of both displaced well fluid and displaced carbonated fluid into the reservoir 1, so the radial holes 4 'of the cylinder 4 are closed in the transport position ii piston 20.

The injection of carbonated liquid into GT 15 by means of a gas booster unit 10 is continued, while due to the replacement of the well fluid with a gas-liquid mixture of the calculated density, the liquid level decreases to a certain level and at a certain point in time when the pressure in the pipe 8 and annular spaces 9 becomes lower than the reservoir pressure (see Fig. 2), the valve 25 of the piston 20 of the valve assembly 5, in the transport position, begins to pass fluid through itself into the pipe space 8 of the tubing string 3. As a result, on last 1, depression is created, inflow from formation 1 is caused, and bottomhole zone pollution is carried away mainly through the pipe space 8 of the tubing string 3 and partially through the lateral openings 18 of the circulation valve 17 through the annular space 9 into the groove system 13, while the contamination is visually observed in gutter system 13. The injection of carbonated liquid into GT 15 is continued for 2-3 hours.

Then stop the injection of carbonated liquid in the GT 15. Unload (at 20-30 kN) the lower end 16 of the GT 15 on the circulation valve 7, while the shear elements 25 are destroyed, the hollow sleeve 23 moves down to interact with the lower end stop 22, and the side holes 18 are hermetically closed by the hollow sleeve 23 and the circulation valve 7, closed by tightly disconnecting the pipe 8 and the annular space 9 of the tubing string 3. The piston 20 is fixedly fixed by means of a spring ring 26 shown conditionally in figure 2.

Then remove the GT 15 from the well 2. Next, produce an acid treatment of the formation 1 (see figure 3). During the acid treatment, the initial injection of the acid solution in the tubing string 3 raises the pressure, for example, to a value of 6 MPa, while the shear screws 24 of the valve assembly 5, made in the form of a piston 20, are destroyed, and it occupies a working position, while the radial holes 4 ' cylinder 4 open and reservoir 1 communicates with the tube space 8 of the tubing string 3.

Next, an acid solution 3 is injected through the tubing string 3 (for example, inhibited hydrochloric acid in accordance with TU 2122-205-00203312-2000, or clay acid - in accordance with TU 02-1453-78) with its injection into formation 1 with a process fluid by means of an acid aggregate (in FIG. .1 not shown), after which they maintain a technological pause, for example, within 12 hours for the reaction of acid with the formation rock 1.

Next, the flexible pipe 15 (as described above) is again lowered into the tubing string 3 (see FIG. 4) until the lower end 16 of the GT 15 reaches interaction with the hollow sleeve 23 of the circulation valve 7, after which the GT 15 is raised by 1 -2 meters.

Using a gas booster unit 10 at the wellhead 2, the process fluid is aerated until the required volume of carbonated liquid is obtained and the gas booster unit 10 is brought into the development mode, having obtained a carbonated liquid of calculated density at the outlet.

After that, carbonated liquid is pumped from the gas booster unit 10 via the discharge line 17 to the GT 15, while the circulation valve 7 is closed, i.e. its side openings 18 separate the pipe 8 and the annular space 9.

Thus, by injection of carbonated liquid into GT 15, a liquid level is reduced in the pipe 8 space, while the displaced liquid located in the pipe 8 space is forced into the groove system 13 through the wellhead 12.

The injection of carbonated liquid into GT 15 by means of a gas booster unit 10 is continued, while due to the replacement of the well fluid located in the pipe space 8 of the tubing string 3 with a gas-liquid mixture of the calculated density, the liquid level drops to a certain level in the pipe space 8 of the tubing string 3 (see Fig. .4) and at a certain point in time when the pressure in the pipe space 8 becomes lower than the reservoir pressure (see Fig. 4), the valve 25 of the piston 20, the valve assembly 5 in the transport position, starts to pass into the pipe space 8 of the tubing string 3, both through itself and through the radial holes 4 'of the cylinder 4, the reaction products of the formation 1 rock with acid.

As a result, depression is created on reservoir 1, an inflow from reservoir 1 is called up with the removal of the reaction products of acid with the formation 1 rock, reaction products are carried along the pipe space 8 of the tubing string 3 into the groove system 13, while the reaction products are visually output in the groove system 1 The injection of carbonated liquid into GT 15 is continued for 2-3 hours. After that, the injection of carbonated liquid into GT 15 is stopped. Next, GT 15 is removed from the pipe space 8 of the tubing string, then the packer 6 is unpacked and removed from the well 2 along with the tubing string 3. The supply and production capabilities of formation 1 are determined, the well 2 is equipped with operational equipment and put to work.

The proposed device has a simple design and a simple process of implementing the method by causing inflow from the formation with carbonated liquid with the possibility of effective development of formations with acid treatment contaminated with the bottom hole zone. Also, the proposed method allows to reduce the hydraulic pressure arising in the process of replacing the fluid in the well by adjusting the design density, the gas-liquid mixture, which allows you to adjust the amount of depression on the formation during the well development and improves the quality of development by eliminating the ingress of well fluid from the overpacker space.

Claims (2)

1. A method for causing inflow from the formation, including a descent into the well on tubing - tubing with radial holes blocked from communicating with tubing in the transport position by the valve assembly, a packer and a circulation valve packer installed above to communicate with the annulus annular space packer above the reservoir, reducing the level of fluid in the pipe and annular spaces to create depression on the reservoir, opening the valve assembly, characterized in that the decrease in the level in the pipes the open and annular spaces by pumping soda fluid through a flexible pipe, pre-lowered into the tubing before interacting with the circulation valve, which is open in the transport position for communication of the pipe and annular spaces, a valve assembly configured to inflow fluid from the reservoir with the tubing in the transport position, open after creating a depression on the formation, and the circulation valve is closed, after which the acid treatment of the formation is carried out, followed by technological exposure, then in The tubing is lowered into a flexible pipe, carbonated fluid is pumped into the tubing to lower the fluid level in it and create depression on the formation with the removal of the reaction of acid with the formation rock. 2. A device for inducing inflow from the formation, including a tubing packer connected to tubing — tubing, wellhead fittings with bends hydraulically connected to tubing and annular tubing spaces, a cylinder installed under the packer with radial openings blocked in the transport position by a valve assembly made in the form of a piston fixed in the cylinder in the upper position, and a circulation valve located above the packer, made in the form of a coupling with a lower end stop and side openings made with the ability to overlap the hollow sleeve fixed in the upper position by shear elements, characterized in that it is equipped with a flexible pipe deflated into the tubing and configured to interact after creating depression on the formation with the hollow sleeve to move it to the end stop with overlapping side openings open in transport position, and the radial holes of the cylinder are blocked in the transport position by a piston fixed in the upper position with destructible elements and made open radial channels when moving downward, and the piston is additionally equipped with a valve that passes from the bottom up.

Images