CN113047811A

CN113047811A - Liquid flow control sliding sleeve

Info

Publication number: CN113047811A
Application number: CN202110291581.9A
Authority: CN
Inventors: 张强; 郭志勋; 穆春峰; 邱前进
Original assignee: Chengdu Sanneng Ruida Energy Technology Co ltd
Current assignee: Chengdu Sanneng Ruida Energy Technology Co ltd
Priority date: 2021-03-18
Filing date: 2021-03-18
Publication date: 2021-06-29
Anticipated expiration: 2041-03-18
Also published as: CN113047811B

Abstract

The invention discloses a flow control sliding sleeve, which belongs to the field of underground petroleum exploitation and comprises a central pipe, wherein the upper part of the central pipe is in sliding connection with an external pipeline through a sliding sleeve body, and a sealing element is arranged at the joint of an opening of an annular pipeline and the central pipe; an oil outlet pipeline is sleeved in the central pipe; the central pipe is reset through a second reset spring, the bottom of the central pipe is fixedly connected with a central check valve, and a valve seat matched with the central check valve is arranged below the central check valve; the central check valve is reset through a first reset spring; one side of the lower part of the central tube is provided with an anchoring device, one end of the anchoring device is fixedly connected to the inner wall of the external pipeline, and the anchoring device is positioned above the first return spring; the invention can realize the advantages of low valve opening pressure, large fluid channel, small fluid resistance, small sliding resistance, strong sand prevention capability, sand resistance, more excellent wear resistance, small risk of liquid leakage and erosion, high integral reliability and the like.

Description

Liquid flow control sliding sleeve

Technical Field

The invention belongs to the field of underground petroleum exploitation, and particularly relates to a liquid flow control sliding sleeve.

Background

The reversing valve is a direction control valve with more than two flow forms and more than two oil ports; the valve realizes communication, cutting off and reversing of hydraulic oil flow, pressure unloading and sequential action control; a direction control valve which depends on the relative movement of the valve core and the valve body; there are two types, namely a rotary valve type and a slide valve type; the valve core is divided into two positions, three positions and the like according to the number of the working positions of the valve core staying in the valve body; the oil way connected with the valve body is divided into a two-way, a three-way, a four-way, a six-way and the like; the movement modes of the operation valve core are manual, motor, electric, hydraulic, electrohydraulic and the like.

At present, in the field of underground petroleum exploitation, the oil production of an electric submersible pump well is widely applied to the production practice of oil fields, but when an electric pump unit stops running due to complex well conditions or other objective factors, impurities or sand particles in a pipe column can be deposited on a check valve under the action of gravity; when the deposited sand amount is accumulated to a certain degree, the check valve is completely buried, so that the pump is difficult to start again and cannot be started, the production of the oil well is stopped, the well repairing operation is caused, and the operation cost is increased.

Much research is done domestically aiming at the problem, but the existing automatic reversing valve still has the following problems: 1. the valve directly controls the separation and the closing of two working states, and although the operation principle is very simple, the phenomena of erosion and liquid leakage are serious; 2. for fluid resistance, the existing reversing valve is greatly influenced by spring force and flow; 3. from the sealing angle, the metal seal of the existing reversing valve is easy to scratch, a rectangular seal is often used, and the sliding resistance of the rectangular seal is very large; the surface of the sealing element is polished, so that the sealing element is not hard enough and is easy to scratch, thereby causing sealing failure; 4. in the self-spraying electric pump well, fluid can directly pass through the electric pump, so that the production flow resistance is increased, and the electric pump is eroded and abraded, so that the service life of the electric pump is greatly shortened; 5. the existing reversing valve often causes the phenomenon that sediment enters an electric pump, so that the pump is blocked.

Disclosure of Invention

In view of the problems in the background art, the present invention is directed to: a flow control sleeve is provided to solve the problems mentioned in the background art.

The purpose of the invention is realized by the following technical scheme: a flow control sliding sleeve comprises a central pipe, wherein the upper part of the central pipe is in sliding connection with an external pipeline through a sliding sleeve body, and the sliding sleeve body is fixedly connected with the external pipeline; an annular pipeline opening is formed in the upper portion of the central pipe, and a sealing element is arranged at the joint of the annular pipeline opening and the central pipe; an oil outlet pipeline is sleeved in the central pipe; a second return spring is wound on the outer side of the middle part of the central tube, the bottom of the second return spring is fixedly connected with the central tube, and the top of the second return spring is fixedly connected with the sliding sleeve body; the bottom of the central pipe is fixedly connected with a central check valve, and a valve seat matched with the central check valve is arranged below the central check valve; a first return spring is wound on the outer side below the central pipe, the bottom of the first return spring is fixedly connected with the top of the central check valve, and the top of the first return spring is fixedly connected with the inner wall of the external pipeline; and one side of the lower part of the central pipe is provided with an anchoring device, one end of the anchoring device is fixedly connected to the inner wall of the external pipeline, and the anchoring device is positioned above the first return spring.

Further, the anchoring device is one of a control fluke or a control ball.

Furthermore, when the anchoring device is a control anchor fluke, a clamping ring is arranged at the corresponding position in the middle of the central tube, the control anchor fluke is a clamping piece, the control anchor is fixedly connected with an external pipeline, and a groove matched with the control anchor fluke is formed in the bottom of the sliding sleeve body.

Further, when the anchoring device is a control ball, a central pipe corresponding position is provided with a central check valve 4 control groove, and an outer shell control groove is arranged at a corresponding position of the inner wall of the external pipeline.

Preferably, the seal is one or more of a Y-shaped or O-shaped seal.

Preferably, the anchoring device is made of cemented carbide.

In summary, due to the adoption of the technical scheme, the invention has the following positive technical effects:

1. by the control logic of the present invention: the central check valve, the control anchoring device, the central pipe and the valve seat have low opening pressure, so that the central check valve can be easily opened, fluid can be smoothly transported in a pipeline, and energy consumption loss is reduced; the production efficiency is improved to a certain extent.

2. Tests prove that compared with the existing automatic reversing valve, the fluid flow control sliding sleeve has the advantages that the fluid channel is larger, the fluid resistance is smaller, the path energy loss of fluid in the fluid flow control sliding sleeve is smaller, and the production efficiency is obviously improved.

3. The sealing mode of the liquid flow control sliding sleeve adopts Y/O sealing, the sliding resistance is small, the sand prevention capability is strong, and the sealing surface process of the liquid flow control sliding sleeve adopts surface polishing and hardening process, the sliding resistance is small, and the hardness is higher; the invention has more excellent sand resistance and wear resistance, can realize longer service life and reduce the working cost in the operation process.

4. Compared with the existing automatic reversing valve, the liquid flow control sliding sleeve has smaller risk of liquid leakage and erosion, can ensure the communication and the closing of the automatic switching oil outlet pipeline and the external pipeline, can reduce the maintenance times, reduce the workload of an operation site and reduce the operation cost of an enterprise.

5. Compared with the existing automatic reversing valve, the liquid flow control sliding sleeve has higher reliability, is very favorable for prolonging the service life and the working efficiency of the electric submersible pump, and provides an excellent solution for the automatic reversing valve for enterprises.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and that for those skilled in the art, other relevant drawings can be obtained according to the drawings without inventive effort, wherein:

FIG. 1 is a schematic front view of the whole liquid flow control sliding sleeve;

FIG. 2 is a schematic perspective view of the flow control sleeve when the pump is stopped;

FIG. 3 is a schematic diagram of a flow control sleeve center check valve;

FIG. 4 is a schematic view of the construction of the flow control sleeve with a portion of the outer conduit shell removed;

FIG. 5 is a schematic view of section A-A of FIG. 4;

FIG. 6 is an enlarged view of a portion of the structure of the open state of the annular pipe joint when the pump is stopped;

FIG. 7 is an enlarged view of a portion of the structure of the annular pipe joint in a closed state when the pump is started;

the labels in the figure are: 1-a sliding sleeve body; 2-a central tube; 3-a first return spring; 4-a central check valve; 5-a seal; 6-a second return spring; 7-an anchoring device; 8-valve seat; 9-opening of the annular pipeline; 10-an oil outlet pipeline; 11-external pipe.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.

Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of "first," "second," and similar terms in the description and claims of the present application do not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. Also, the use of the terms "a," "an," or "the" and similar referents do not denote a limitation of quantity, but rather denote the presence of at least one. The word "comprise" or "comprises", and the like, means that the element or item listed before "comprises" or "comprising" covers the element or item listed after "comprising" or "comprises" and its equivalents, and does not exclude other elements or items. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.

The features and properties of the present invention are described in further detail below with reference to examples.

Example one

As shown in fig. 1 to 7, a flow control sliding sleeve according to a preferred embodiment of the present invention includes a central tube 2, an upper portion of the central tube 2 is slidably connected to an external pipe through a sliding sleeve body 1, and the sliding sleeve body 1 is fixedly connected to the external pipe; an annular pipeline opening 9 is formed in the upper portion of the central pipe 2, and a sealing element 5 is arranged at the joint of the annular pipeline opening 9 and the central pipe 2; an oil outlet pipeline 10 is sleeved in the central pipe 2; a second return spring 6 is wound on the outer side of the middle part of the central tube 2, the bottom of the second return spring 6 is fixedly connected with the central tube 2, and the top of the second return spring 6 is fixedly connected with the sliding sleeve body 1; the bottom of the central tube 2 is fixedly connected with a central check valve 4, and a valve seat 8 matched with the central check valve 4 is arranged below the central check valve 4; a first return spring 3 is wound on the outer side below the central pipe 2, the bottom of the first return spring 3 is fixedly connected with the top of the central check valve 4, and the top of the first return spring 3 is fixedly connected with the inner wall of the external pipeline 11; an anchoring device 7 is arranged on one side of the lower portion of the central tube 2, one end of the anchoring device 7 is fixedly connected to the inner wall of the outer pipeline 11, and the anchoring device 7 is located above the first return spring 3.

The sealing element 5 is one or more of Y-shaped sealing elements or O-shaped sealing elements; the anchoring device 7 is made of hard alloy.

Further, when the anchoring device 7 is a control anchor fluke, a clamping ring is arranged at a position corresponding to the middle of the central pipe 2, the control anchor fluke is a clamping piece and is fixedly connected with the external pipeline 11, and a groove matched with the control anchor fluke is formed in the bottom of the sliding sleeve body 1.

The core mechanical logic of the invention is that the middle production channel is closed by fully utilizing the pressure of the liquid column, the annular pipeline is opened, the middle production channel is opened by utilizing the pressure of the electric pump, and the annular pipeline is closed;

when the pump is stopped, the central check valve 4 is reset on the valve seat 8 under the dual actions of the first reset spring 3 and the liquid column, the middle production channel is closed and is locked with the anchoring device 7, the central pipe 2 and the valve seat 8, and the central pipe 2 is opened downwards under the action of the second reset spring 6 and the liquid column pressure; when the pump is started, the central check valve 4 moves upwards under the condition of pump outlet pressure, the central check valve 4, the valve seat 8, the anchoring device 7 and the central pipe 2 are locked together to drive the central pipe 2 to move upwards together until the central pipe 2 closes the annular pipeline, the anchoring device 7 is abducted into a groove reserved in the sliding sleeve body 1, the central check valve 4 is separated from the valve seat 8, fluid enters the oil outlet pipeline 10 through the intermediate production channel, and before the intermediate production channel is opened, the fluid enters the annular pipeline to erode the sealing surface.

A flow Control sliding sleeve FCD (flow Control door) which can automatically switch the production channel and the annular channel when the pump is started or closed; when the electric pump is started, the intermediate production channel of the liquid flow control sliding sleeve FCD is opened, and the annular channel is automatically closed; when the electric pump stops, the middle production channel is automatically closed, the annulus is opened, and the sand-containing fluid in the oil pipe column can be discharged into the annulus; the intermediate production passage connected to the electric pump is automatically closed to prevent the sand from entering the electric pump.

FCD is using at the self-blowing electric pump well, and the charge pump does not operate, and the annular space is opened, and middle production passageway is closed, and the fluid can get into production oil pipe from annular space passageway, avoids the fluid to pass through the charge pump, when increasing the production flow resistance, erosion, wearing and tearing charge pump influence the charge pump life-span. When the pump needs to be started for production, the intermediate production channel is opened, the annular space is closed, and fluid enters the intermediate production channel after being pressurized by the electric pump. The application of the invention not only meets the requirements of reducing the production flow resistance and protecting the electric pump during the self-blowing process, but also meets the requirements of later-stage production of the sand-blocking prevention pump.

Example two

In this embodiment, based on the first embodiment, the anchoring device 7 is replaced by a control ball, a central check valve control groove is arranged at a position corresponding to the central pipe 2, and an outer casing control groove is arranged at a position corresponding to the inner wall of the outer pipeline 11.

At this time, the working principle of the invention is as follows: before starting the pump, the central check valve 4, the control ball and the central pipe 2 are locked together; when the pump is started, fluid at the outlet of the electric submersible pump is used for pushing the central check valve 4, the control ball and the central pipe 2 to integrally move upwards, after the annular hollow pipeline is closed, the control ball rolls into the outer shell control groove, the central check valve 4 is released, and the fluid enters the oil pipe through the central check valve 4; when the pump is stopped, the central check valve 4 resets under the dual action of the first reset spring 3 and the fluid pressure, the middle production channel is closed, the control ball resets into the central check valve control groove, the central pipe 2 moves downwards under the dual action of the reset spring and the liquid column, and the side surface is opened.

EXAMPLE III

In the embodiment, on the basis of the first embodiment, the liquid flow Control sliding sleeve fcd (flow Control door) is applied to an electric Submersible screw pump espcp (electrical Submersible progressive Cavity pump), wherein the electric Submersible screw pump is a combination of a screw pump (PCP) and an Electric Submersible Pump (ESP), and the electric Submersible screw pump combines the advantages of an electric Submersible centrifugal pump and the screw pump, so that the ground drive of the screw pump is changed into that the motor directly drives through a speed reducer, a sucker rod is removed, and the problems of tripping, rod breaking, eccentric wear and the like of the sucker rod are solved; the working principle of the embodiment is similar to that of the embodiment, but due to the working characteristics of the electric submersible screw pump, when the electric pump needs to be subjected to reverse rotation such as sand cleaning and the like, the difference is that when the electric submersible pump is subjected to reverse rotation, the liquid flow direction is from bottom to top (from an inlet to an outlet), and a check valve is additionally arranged in the scheme, so that the problem that when the electric submersible screw pump is subjected to reverse rotation, the liquid flow channel is from top to bottom (from the outlet to the inlet) is solved, and the normal operation of the electric submersible screw.

Example four

The functional test of the invention is as follows (taking the control ball as an example):

the working principle is as follows: before starting the pump, the central check valve 4, the control ball and the central pipe 2 are locked together; when the pump is started, fluid at the outlet of the electric submersible pump is used for pushing the central check valve 4, the control ball and the central pipe 2 to integrally move upwards, after the annular hollow pipeline is closed, the control ball rolls into the outer shell control groove, the central check valve 4 is released, and the fluid enters the oil pipe through the central check valve 4; when the pump is stopped, the central check valve 4 resets under the dual action of the first reset spring 3 and the fluid pressure, the middle production channel is closed, the control ball resets into the central check valve control groove, the central pipe 2 moves downwards under the dual action of the reset spring and the liquid column, and the side surface is opened.

And (3) verifying the opening pressure:

and (3) calculating the opening pressure: when the valve is opened upwards, the compression limit force of the spring is 480N, and the sealing area of the central pipe is 6575mm²The calculation formula is as follows: the spring compression limiting force/center tube sealing area is 480/6575-0.073 MPA, that is, the opening pressure is 0.073 MPA.

And (3) testing the flow resistance under different discharge capacities: (the area of the intermediate production channel is 2500mm²)

Experimental equipment:

1. centrifugal pump, discharge capacity scope 10 ~ 1000 square/day, pump pressure: 0.01 to 0.5 MPA;

2. the invention relates to a set of liquid flow control sliding sleeves;

3. 2 m 5.5X 17PPF, 124.26mm internal diameter, 121mm drift diameter, change the sleeve into the test tool tube of end flange, middle zone coupling.

4. One flow meter is electronically displayed, and the measuring range is 100-1000 square/day;

5. one pressure gauge is mechanically displayed, the measuring range is 1.6MPA, and the minimum scale is 0.05 MPA;

6. a transition joint;

7. a pressure hose with a rated pressure of 1 MPA;

8. flow control valves (ball valves);

9. a measuring water tank;

10. and a stopwatch.

The experimental scheme is as follows:

1. a pressure gauge and a flow meter are connected in front of the invention, the pump is started to discharge small displacement, the condition of multiple opening pressures is observed, and the opening pressure is counted.

2. After opening, the displacement was gradually increased, and the flow resistance at different displacements was recorded.

The experimental steps are as follows:

1. the assembly tool is used for detecting the machined tool accessories, assembling and manually testing functions, putting the tool accessories into a testing sleeve after the tool accessories are normally operated, connecting an input hose, starting a power supply, and observing and recording the change conditions of starting pressure and flow resistance.

The opening pressure and flow resistance changes are shown in the following table:

opening pressure (MPA)	Pressure loss (MPA)	Flow (m3/h)	Reset condition	Test results
					0.06	0.12	21.8	Timely and timely	By passing
0.08	0.14	26.4	Timely and timely	By passing
					0.06	0.19	30.7	Timely and timely	By passing
0.08	0.18	32.6	Timely and timely	By passing
					0.06	0.19	32.7	Timely and timely	By passing
0.08	0.19	33.8	Timely and timely	By passing
					0.06	0.2	36.5	Timely and timely	By passing

By combining the above data, it can be seen that: the opening pressure meets the design requirement, and the opening pressure is as follows: 0.06-0.08 MPA, the pressure reduction range is within an acceptable range, and the overall design requirement is met.

EXAMPLE five

The sand control test of the present invention is as follows (taking the control ball as an example):

the test purpose is as follows: the reliability and the durability of the invention in the sand-containing fluid environment are verified.

Experimental equipment:

1. an indoor experimental well;

2. one electric submersible pump: 562 a motor, 513 a protection area, 513GC6100 pumps, the discharge capacity range is 300-900 square/day, and the head is 1.2-3.5 MPA;

3. a ground control cabinet: a 165KVA VSD +170KVA transformer;

4. the invention relates to a set of liquid flow control sliding sleeves;

5. oil pipe, simple wellhead device;

6. one flow meter is electronically displayed, and the measuring range is 100-1000 square/day;

7. one pressure gauge is mechanically displayed, the measuring range is 4.5MPA, and the minimum scale is 0.1 MPA;

8. a table, a jig, etc.

The experimental scheme is as follows:

1. the outlet of the experimental well is connected with a pressure gauge, a set of liquid flow control sliding sleeves, a flow meter, an elbow water return pipe and the like;

2. and slowly adding fine sand at a backwater wellhead to enable the circulating liquid to become a sand-containing fluid, starting and stopping the pump for 20 times, taking apart for detection, and checking the sealing abrasion condition.

The experimental steps are as follows:

1. the assembly tool is used for assembling and manually testing after the machined tool accessories are detected, and is connected to a simple wellhead after the tool accessories are normally operated, and a flowmeter, an elbow hose and the like are connected to the wellhead; and then starting a pump to observe that the liquid flow control sliding sleeve disclosed by the invention is normally opened and circulated, slowly adding fine sand when a return water hose enters a wellhead, circulating for 10 minutes, stopping the pump, observing whether the liquid flow control sliding sleeve disclosed by the invention can be normally reset, and starting the pump again after 5 minutes to observe whether the liquid flow control sliding sleeve disclosed by the invention can be normally opened.

2. And repeating the steps of switching on and switching off the pump for 20 times, stopping the pump, disassembling and checking, and observing whether the sealing element and the sealing surface are worn or not.

The experimental results are as follows: and the sealing element and the metal sealing surface have no abrasion phenomenon.

In the foregoing, various embodiments of the present invention have been described with reference to specific examples. However, it should be understood that: the description of the various embodiments of the present invention is not intended to be limiting. The above description is intended to be exemplary of the invention and not to limit the scope of the invention, which is defined by the claims.

Claims

1. A flow control sliding sleeve comprises a central tube (2) and is characterized in that,

the upper part of the central pipe (2) is in sliding connection with an external pipeline through a sliding sleeve body (1), and the sliding sleeve body (1) is fixedly connected with the external pipeline; an annular pipeline opening (9) is formed in the upper portion of the central pipe (2), and a sealing element (5) is arranged at the joint of the annular pipeline opening (9) and the central pipe (2); an oil outlet pipeline (10) is sleeved in the central pipe (2);

a second reset spring (6) is wound on the outer side of the middle part of the central tube (2), the bottom of the second reset spring (6) is fixedly connected with the central tube (2), and the top of the second reset spring (6) is fixedly connected with the sliding sleeve body (1);

the bottom of the central pipe (2) is fixedly connected with a central check valve (4), and a valve seat (8) matched with the central check valve (4) is arranged below the central check valve (4);

a first return spring (3) is wound on the outer side below the central pipe (2), the bottom of the first return spring (3) is fixedly connected with the top of the central check valve (4), and the top of the first return spring (3) is fixedly connected with the inner wall of the external pipeline (11);

an anchoring device (7) is arranged on one side of the lower portion of the central tube (2), one end of the anchoring device (7) is fixedly connected to the inner wall of the external pipeline (11), and the anchoring device (7) is located above the first return spring (3).

2. A flow control sleeve according to claim 1, wherein said anchoring means (7) is one of a control fluke or a control ball.

3. The flow control sliding sleeve according to claim 2, wherein when the anchoring device (7) is a control fluke, a clamping ring is arranged at a position corresponding to the middle of the central pipe (2), the control fluke is a clamping piece, the control fluke is fixedly connected with the external pipeline (11), and a groove matched with the control fluke is arranged at the bottom of the sliding sleeve body (1).

4. A flow control sleeve according to claim 2, wherein when the anchoring means (7) is a control ball, the central tube (2) is provided with a central check valve 4 control groove at a corresponding position, and the inner wall of the outer pipe (11) is provided with an outer shell control groove at a corresponding position.

5. A flow control sleeve according to claim 1, wherein the seal (5) is one or more of a Y-or O-seal.

6. A flow control sleeve according to claim 1, characterised in that the anchoring means (7) is made of cemented carbide.