RU2445450C2 - Oil production method, and valve device for its implementation - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: method involves lowering to the well on tubing string of the layout containing bottom-hole pump, valve device, shank with filter or without it, killing liquid pumping by means of bottom-hole pump through the shank, valve device to tubing string with further displacement to well head. Valve device has the possibility of cutting-off the shank when working fluid containing inhibitors is supplied to it from ground pump station, with simultaneous opening in it of hydraulic valves for oil supply from annular space and working fluid with inhibitors to bottom-hole pump inlet. Valve device includes housing with central and side channels made in it, at least two holes connecting the channels, and at least one hole connecting the side channel to annular space, as well as gate valve in the form of on/off plunger and limit stop of on/off plunger. Plunger has the possibility of connecting the annular space to central channel.

EFFECT: possibility of cutting-off the shank and supply of inhibitors immediately to bottom-hole pump inlet.

7 cl, 4 dwg

Description

The group of inventions relates to the oil industry and can be used for the development of oil wells and oil production in fields with a high gas factor and paraffin content.

A known method of oil production using a deep pump / RU 2065026 C1, EV 43/00, 1996.08.10 /. To prevent corrosion of the casing pipes by eliminating the contact of the surface of the casing pipes with the formation fluid, the downhole pump is installed above the reservoir, connected to the tail pipes. The tail pipes are lowered to the bottom of the well, and a check valve is placed at their lower end.

The disadvantage of this method of oil production is that in fields with an increased gas factor in the process of well development during the selection of killing fluid, the liner plays a positive role in helping to quickly select the killing fluid, but during oil production, the presence of a liner negatively affects the growth of the gas cap at the deep pump, which significantly reduces the performance of the installation of a sucker rod pump (USGGN).

Also known is a downhole sucker rod pumping unit for pumping emulsion oils and gas-liquid mixtures / RU 2196249 C1, IPC F04B 47/00, 2003.01.10 /, comprising a tubing string with a shank, a sucker rod pump with main and additional suction valves, moreover, the pump sits on the supporting cone seat.

The disadvantage of this pump installation is that the design does not allow to pump out the water or liquid there from the bottom of the well. In addition, the problem of discharging free gas accumulating under the pump plunger has not been solved.

There is also a known method and device for production, including a tubing string with a liner and a packer. / RU 2088749 C1, IPC Е21В 43/00, 1997.08.27 /. A tubing pump is installed inside the tubing. A metering unit is placed in the tubing, which connects the tubing cavity to the annulus. The disadvantage of this method is that the supply of inhibitors is made directly into the annulus, which leads to their increased consumption. The presence of a packer leads to an increase in operating costs.

A known method of oil production / RU 2336412, IPC ЕВВ 43/018, ЕВВ 43/08, 2008.10.20 / (selected as a prototype), including the descent into the interval of perforation of the well on the string of tubing assembly containing a sucker rod pump with a housing, having openings in the middle, a liner, the impact on the bottom-hole zone of the well by elastic vibrations, pumping of reaction products with simultaneous washing of the processed products through the liner, valve device, sucker rod pump into the tubing string with further supply to the well mouth ins and creating alternating motion of the liquid at the perforations, the arrangement of the perforations in the bottom-equipped cylindrical slotted plugged filter with slits. Oil production is carried out by a deep-well sucker rod pump through a tubing string with subsequent supply to the wellhead.

The disadvantage of this method is that it does not provide reliable protection of downhole equipment if the produced formation fluid contains paraffins, salts, corrosive substances, the neutralization of which requires the simultaneous supply of various inhibitors, in addition, oil production through the liner contributes to the release of associated gas in a deep sucker rod pump, which reduces its performance.

Known downhole valve device / RU 2023865, IPC ЕВВ 34/06, 1994.11.30 /, including a pipe with a passage channel and a radial hole, a hollow body connected to the pipe with holes for fluid passage and hydraulically connected to the pipe passage channel, and a spring-loaded shutter with the shank and the locking protrusion, while the housing and the shutter with the shank are installed parallel to the axis of the nozzle, the housing is made with an additional cavity hydraulically connected to the passage channel of the nozzle, and the device is equipped with additional ADDITIONAL body cavity gate in the shank perpendicular to the latter with a spring-loaded piston ring groove and the rod and mounted concentrically relative to one another by cylindrical inner and outer sleeves, the inner sleeve being provided with a shank having a through hole for receiving the rod.

Also known is a downhole valve device / RU 2121053, IPC ЕВВ 34/06, 1998.10.27 / (selected as a prototype), comprising a hollow body mounted eccentrically to the tubing string and made with two holes for communicating its cavity with the tubing cavity -compressor pipes and one hole for communicating their cavity with the annulus, a shutter in the form of a two-position plunger with lip seals that fix the latter in the upper position due to the elasticity of the material and provide covering with a plunger an opening communicating the body cavity with the annular space by creating a vacuum in the body cavity under the plunger, and a stroke limiter of the on / off plunger.

The disadvantage of the above devices is that to open the valve it is necessary that the fluid level in the annulus is at least equal to the fluid level in the tubing string, which, as a rule, does not happen with mechanized oil production. In addition, under conditions of highly permeable reservoirs and low reservoir pressures, it is almost impossible to create a pressure in the annulus greater than the hydrostatic pressure in the tubing string, and thus, opening the valve device becomes impossible.

The problem solved by the group of inventions is:

- improving the efficiency of work in oil production;

- elimination of the negative impact of the presence of a liner in the process of oil production in fields with a high gas factor;

- elimination of paraffin formation, scaling, corrosion reduction of downhole equipment by simultaneously supplying the appropriate inhibitors directly to receive a deep well pump, and thereby increasing the overhaul period and reducing the cost of operating oil fields.

The problem is solved due to the fact that in the method of oil production, including the descent into the well on the string of tubing assembly containing a sucker rod pump, a liner with or without a filter; pumping out the killing fluid with a deep-well sucker rod pump through the liner into the tubing string with subsequent removal to the wellhead, oil production with the deep-well sucker rod pumping in the tubing string with subsequent removal at the wellhead, according to the invention, oil production is carried out at the end of the killing fluid pumping; As part of the layout for oil production, a valve device is used that is installed between the liner and the deep-well sucker-rod pump and is configured to supply killing fluid through it to the inlet of the deep-well sucker-rod pump or oil from the dynamic level of the annulus and inhibitors from the wellhead to the inlet of the deep-well sucker-rod pump with providing shut-off of the shank.

In addition, the supply of inhibitors to the valve device can be carried out as part of the working fluid supplied under pressure through the pipeline from the ground pump station and providing a shut-off of the liner, opening of hydraulic channels in the valve device for supplying oil and working fluid with inhibitors to the inlet of the deep-well rod pump.

The problem is also solved due to the fact that in the valve device comprising a housing with central and lateral channels made therein, at least two openings for communicating the channels and at least one opening for communicating the side channel with the annular space, a shutter in the form of a two-position plunger installed with a seal in the side channel with the possibility of blocking the hole for communication of the channel with the annulus and with the possibility of fixation in the upper position, two-way travel limiter insulating plug according to the invention the central channel housing is connectable with the top of the sucker rod pump and at the bottom - with a shank; the limiter of the stroke of the on-off plunger is made with the possibility of ensuring the installation of the plunger in the lower position; in the upper part of the lateral canal, a sealed inlet equipped with a check valve is arranged to connect a pipeline connected to a ground pump station, which supplies pressurized working fluid containing inhibitors to the plunger cavity of the canal; in the lower part of the lateral channel, a landing unit is arranged for installing a detachable locking element that secures the plunger in the upper position, in which the plunger covers the openings for communicating the channels and the opening for communicating with the annulus; the plunger is configured to provide annulus communication through it, one of the openings for communicating the channels with the central channel and the supra-plunger cavity through another opening for communicating the channels with the central channel when it is installed on the travel stop.

In the particular case of the execution of the valve device, the plunger stroke limiter can be made in the form of a stage located in the lower part of the side channel.

In addition, the design of the valve device may include a plunger with either an annular recess, or with an axial cavity and radial channels to ensure communication of the Central channel with the annulus.

In addition, in the supraplunger cavity or in the subplunger cavity of the lateral channel of the valve device, a compression spring or a tension spring can be located, respectively, providing a fixed lower position of the plunger.

The method of oil production and valve device for its implementation are illustrated by the following drawings.

Figure 1 shows a diagram of an installation for implementing a method of oil production using the inventive valve device during the pumping period of the kill fluid; figure 2 shows a diagram of the installation during oil production; figure 3 is a section of a valve device with the placement of the plunger in the lower position; figure 4 is a section of the valve device with the placement of the plunger in the upper position.

The oil production installation includes a ground-based pumping station 1 with control systems, in which containers 2, 3, 4 with various inhibitors that are part of the working fluid are located, metering pumps 5, 6, 7, which are connected to a flexible armored pipeline 8 and through it to the valve device 9, installed between the deep-well sucker rod pump (GSHN) 10 and the shank 11 on the tubing string 12. The shank 11 is equipped with a suction valve 13. A flexible armored pipe 8 is mounted on the tubing string 12 with clamps 14. Suction The valve 15 mounted in the receiving chamber 16 GSHN 10 fluidly connected to one channel of the valve device 9.

The valve device 9 (Figs. 3, 4) consists of a housing 17 in which a central channel 18, a lateral channel 19, openings 20, 21 for communicating the channels 18, 19 and an opening 22 for communicating the side channel 19 with the annulus of the well are formed. On channel 18, threads 23 and 24 are made for connecting the device to the main shaft 10 and the shank 11, respectively. A two-position plunger 25 is installed inside the channel 19 with the possibility of movement, the sealing of which inside the channel 19 is ensured by sealing elements 26. In the upper part of the channel 19 there is a sealed inlet in the form of a hollow fitting 27 with a compression spring 28 installed in its cavity. The cavity of the fitting 27 and part of the channel above the plunger 25 form a supra-plunger cavity 29. On the nozzle 27, a check valve 30 is arranged with an internal channel 31, the diameter of which is less than or equal to the internal diameter of the flexible armored pipeline 8, connected with the ground pump station 1, which supplies the working fluid under pressure to the supraplunger cavity 29. The location of the plunger 25 in the upper position (figure 3), in which the openings 20, 21 and 22 are closed, is provided by a detachable locking element, for example, a pin 32, located in the installation node 33, made in the lower part of the channel 19. To install the plunger 25 in the lower position (figure 4) in the design of the side channel 19, there is a stroke limiter made in the form of a stage 34 of the channel, and in the design of the plunger 25 is larger stage 35, which he "sits" on the stage 34 of the side channel. In addition, a radial recess 36 is made in the plunger 25, which provides a hydraulic connection between the annulus of the well through the openings 22 and 21 with the cavity of the central channel 18 when the plunger 25 is installed in the lower position. In addition, in this position of the plunger, a message opens between the supraplunger cavity 29 through the opening 20 and the cavity of the Central channel 2.

The method of oil production using the inventive valve device is implemented as follows (figure 1).

In the initial period of well development, SHGN 10 selects the killing fluid through the liner 11 and the suction valve 13, the central channel 18 of the valve device 9, the suction valve 15 into the receiving chamber 16 of the main compressor 10 and then through the tubing string 12 at the wellhead. At the same time, formation fluid enters the well from the reservoir 37 through the perforations 38, which, due to the fact that its density is much lower than the density of the kill fluid, rises up to the dynamic level 39. During the operation of GSN 10, the kill fluid is gradually replaced by formation fluid. The liquid is taken all this time through the shank 11. During the selection of the jamming fluid, the flexible armored pipe 8 is filled with a working fluid under hydrostatic pressure, which is held by a custom non-return valve 30, thereby preventing unauthorized operation of the valve device 9. The upper position of the plunger 25 in channel 3 (Fig. .1, 3), in which there is no hydraulic connection between the annulus 40 and the central channel 18 and the supra-plunger cavity 29 also with the central channel 18 due to cover with a plunger of 25 holes 22 and 20, fixed with a stall pin 32.

Upon completion of the selection of killing fluids, the well is transferred to oil production (Fig.2, 4). Located in the pumping station 1, metering pumps 5, 6, 7 together with the working fluid supply inhibitors from tanks 2, 3, 4 through a flexible armored pipeline 8 to the valve device 9, increasing the pressure in it, while opening the check valve 30 and pressure transferred to the plunger 25, which, moving down, cuts the pin 32 and "sits" step 35 on the stroke limiter 34. The plunger 25 occupies a position inside the channel 19, in which the hole 22 coincides with the recess 36 of the plunger, which, in turn, coincides with hole 21 for messages of channels 18 and 19. The “released" spring 28 fixes this position. A hydraulic connection appears between the annular space 40 and the channel 18 along the following path: hole 22, recess 36 of the plunger 25, hole 21, channel 18 and further to the receiving chamber of the main compressor 10. In addition, the plunger has such a vertical size that when installed in the lower In this position, the hydraulic channel was opened between the supraplunger cavity 29 and the channel 18 through the opening 20. The pressure inside the liner 11 and in the annulus 40 is equalized, as a result of which the valve 13 closes, thus, the tail turns off vetk 11. Formation fluid enters the receiving chamber 16 of the main hydraulic train 10 from the dynamic level 39 of the annular space 40, which naturally rises from the dissolved associated gas in the process of rising to a dynamic level.

At the same time, through flexible armored pipeline 8, metering pumps 5, 6, 7 from tanks 2, 3, 4, respectively, through the open hydraulic channel of the valve device 9 (supraplunger cavity 29 - hole 20 - cavity of the central channel 18) together with the working fluid into the receiving chamber 16 GSHN 10 serves inhibitors that destroy asphalt-resin-paraffin deposits (AFS), which prevent scaling and inhibit corrosion, etc.

Mixing with the produced formation fluid, they enter the wellhead through the tubing string 12.

Thus, the proposed technical solution can significantly increase the efficiency of work in oil production, eliminate the negative impact of the liner during oil production in fields with a high gas factor, significantly ease the destruction of paraffin deposits by supplying the appropriate inhibitors directly to the intake of a sucker rod pump, reduce corrosion of downhole equipment and thereby increasing the overhaul period and reducing the cost of operating oil fields.

Claims (7)

1. The method of oil production, including the descent into the well on a string of tubing assembly containing a sucker rod pump, a liner with or without a filter; pumping out the killing fluid by a deep-well sucker rod pump through the liner, into the tubing string with subsequent removal to the wellhead, oil production by the deep-well sucker rod pump through the tubing string with subsequent removal to the wellhead, characterized in that the oil is produced at the end of pumping kill fluids; As part of the layout for oil production, a valve device is used that is installed between the liner and the deep-well sucker rod pump and is configured to supply killing fluid through it to the inlet of the deep-well sucker rod pump or oil from the dynamic level of the annulus and inhibitors from the wellhead to the inlet of the deep-well sucker rod pump providing shut-off of the shank. 2. The method according to claim 1, characterized in that the supply of inhibitors to the valve device is carried out as part of the working fluid supplied under pressure through the pipeline from the ground pump station and providing a shut-off of the liner, opening of hydraulic channels in the valve device for supplying oil and working fluid with inhibitors at the inlet of a deep-well pump. 3. Valve device comprising a housing with central and lateral channels made therein, at least two openings for communicating channels and at least one opening for communicating the lateral channel with the annulus, a shutter in the form of a two-position plunger mounted with a seal in the lateral channel with the possibility of overlapping the hole for communication of the channel with the annulus, and with the possibility of fixing in the upper position, the stroke limiter of the on-off plunger, characterized in that the central the th channel of the housing is made with the possibility of connection in the upper part with a sucker rod pump and in the lower part with a shank; the limiter of the stroke of the on-off plunger is made with the possibility of ensuring the installation of the plunger in the lower position; in the upper part of the lateral canal, a sealed inlet equipped with a check valve is arranged to connect a pipeline connected to a ground pump station, which supplies pressurized working fluid containing inhibitors to the plunger cavity of the canal; in the lower part of the lateral channel, a landing unit is arranged for installing a detachable locking element that secures the plunger in the upper position, in which the plunger covers the openings for communicating the channels and the opening for communicating with the annulus; the plunger is configured to provide annulus communication through it, one of the openings for communicating the channels with the central channel and the supra-plunger cavity through another opening for communicating the channels with the central channel when it is installed on the travel stop. 4. The valve device according to claim 3, characterized in that the plunger stroke limiter is made in the form of a step located in the lower part of the side channel. 5. The valve device according to claim 3, characterized in that an annular recess is made in the plunger to ensure communication of the central channel with the annulus. 6. The valve device according to claim 3, characterized in that the plunger has an axial cavity and radial channels to ensure communication of the central channel with the annulus. 7. The valve device according to claim 3, characterized in that in the supraplunger cavity or in the subplunger cavity of the lateral canal there is a compression spring or a tension spring, respectively, providing a fixed lower position of the plunger.

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