CN218563641U

CN218563641U - Eccentric water distributor for oil field

Info

Publication number: CN218563641U
Application number: CN202223227922.5U
Authority: CN
Inventors: 贾广生; 李磊; 黄莉; 周春阳; 赵萍; 孔祥伟; 向庆峰; 贾寿天; 崔浥尘; 张贵庆; 李昭兵
Original assignee: Mudanjiang Tianqing Petroleum Machinery Equipment Co ltd
Current assignee: Mudanjiang Tianqing Petroleum Machinery Equipment Co ltd
Priority date: 2022-12-02
Filing date: 2022-12-02
Publication date: 2023-03-03
Anticipated expiration: 2032-12-02

Abstract

The utility model belongs to the oil field instrument field in the pit especially relates to an eccentric injection mandrel is used in oil field, including the water distribution main part, processing has axial blind hole and axial to cross the liquid passageway in the water distribution main part, installs the valve member that has the one-way function that switches on in the axial blind hole, and processing has the first liquid hole of crossing on the inner wall that the liquid passageway was crossed to the axial, and processing has the water injection well choke that communicates with the exit end of valve member on the outer wall of water distribution main part. The utility model discloses disk seat and ejector pin down have been add on the basis of the valve member in current water injection mandrel to the disk seat all can with the sealed cooperation of valve ball with lower disk seat in making. Through the cooperation of valve ball and last disk seat, when pressure is greater than the tubular column internal pressure in the pit, can prevent liquid reflux in the pit, through the cooperation of valve ball and lower disk seat, when stopping the water injection and formation pressure is less than the interior water pressure of tubular column, can prevent to take out because of the interior water natural outflow of tubular column causes in the pit air or crude oil to the mesh of avoiding flowing backwards has completely been reached.

Description

Eccentric water distributor for oil field

Technical Field

The utility model belongs to the oil field instrument field in the pit especially relates to an oil field is with eccentric injection mandrel.

Background

The water distributor is a well tool commonly used in oil field life production, and when in use, the water distributor is lowered to the well through a pipe column, and water is injected into an oil layer through the water distributor, so that the purpose of increasing the yield is achieved.

In order to prevent liquid in the stratum from entering the water distributor and polluting the water distributor, one-way valves are arranged in some water distributors, and the liquid in the stratum can be effectively prevented from flowing back into the water distributor through the one-way valves.

However, the above-described water distributor has another problem: during the entire period of formation waterflooding, the pressure of the formation varies widely as the waterflooding phase and waterflooding scheme change. When the formation pressure is lower than the pressure in the water distributor, water in the pipe column can continuously enter the stratum even if the water injection channel is closed, and air or crude oil with density lower than that of water in the stratum can enter the water distributor and the pipe column in a small amount to supplement the space in the pipe column. In this case, the non-return valve in the existing water distributors cannot perfectly prevent the backflow, and at the same time, the air entering the pipe column can adversely affect the injection process after the water injection is restarted.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing an eccentric injection mandrel is used in oil field optimizes the improvement through the injection mandrel to current, solves the problem that the check valve in the current injection mandrel can't prevent the refluence completely.

The utility model provides a technical problem adopt following technical scheme to realize:

an eccentric water distributor for an oil field comprises a water distribution main body, wherein an axial blind hole and an axial liquid passing channel are processed in the water distribution main body, a valve assembly with a one-way conduction function is installed in the axial blind hole, a first liquid passing hole is processed on the inner wall of the axial liquid passing channel, a water nozzle communicated with the outlet end of the valve assembly is processed on the outer wall of the water distribution main body, and when water is injected, water entering the axial liquid passing channel reaches the inlet end of the valve assembly through the first liquid passing hole, then flows out from the outlet end of the valve assembly, then flows out from the water nozzle and finally enters a stratum;

the valve component comprises an upper valve seat, a valve ball, a lower valve seat, a spring and an ejector rod; the upper valve seat, the valve ball, the lower valve seat and the spring are sequentially arranged in the axial blind hole from top to bottom, the upper valve seat is fixedly connected to the upper end of the axial blind hole, and the valve ball, the lower valve seat and the spring are packaged in the axial blind hole;

the lower end of the upper valve seat and the upper end of the lower valve seat are both provided with sealing conical surfaces matched with the valve ball;

the lower valve seat always keeps the movement trend of approaching the upper valve seat under the action of the elastic force of the spring;

the lower end of the ejector rod is fixedly connected to the bottom of the axial blind hole; and in the state of not going into the well and being installed, the distance which is not less than 5mm is reserved between the upper end of the ejector rod and the valve ball.

As a priority scheme, the lower valve seat is fixedly connected to the water distribution main body through a shear pin.

As a priority scheme, a blanking plug mounting hole is further processed on the water distribution main body and communicated with the inside of the axial blind hole, a blanking plug is mounted in the blanking plug mounting hole, the position of the first liquid passing hole corresponds to that of the blanking plug, and when water is injected, water enters the axial blind hole after passing through the blanking plug after entering the first liquid passing hole.

Preferably, the upper valve seat is in sealing fit with the inner wall of the axial blind hole, and the lower valve seat is in sliding sealing fit with the inner wall of the axial blind hole.

Preferably, a second liquid passing hole is formed in the upper valve seat and is directly or indirectly communicated with the first liquid passing hole, so that water entering the axial liquid passing channel is introduced above the valve ball.

The beneficial effects of the utility model are that: the utility model discloses disk seat and ejector pin have been add down on the basis of the valve member in the current water injection mandrel to the disk seat all can with the sealed cooperation of valve ball down with the disk seat in the messenger. Through the cooperation of valve ball and last disk seat, when pressure is greater than tubular column internal pressure in the pit, can prevent liquid reflux in the pit, through the cooperation of valve ball and disk seat down, when stopping the water injection and formation pressure is less than the interior water pressure of tubular column, can prevent to flow out the air in the pit or crude oil that cause because of the tubular column water nature and take out in reverse to the mesh of avoiding flowing back has been reached completely.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a partially enlarged view of a portion a in fig. 1.

Fig. 3 is a partially enlarged view of fig. 1 at B.

Fig. 4 is a schematic structural view of the upper end surface of the water distribution body when the water distribution body is additionally provided with a plug.

Fig. 5 is a schematic structural view of the water distribution body when the water distribution body is additionally provided with a plug.

In the figure: 1. a water distribution main body; 2. an upper valve seat; 3. a valve ball; 4. a lower valve seat; 5. a top rod; 6. a water nozzle; 7. a spring; 8. shearing a nail; 9. a second liquid passing hole; 10. a first liquid passing hole; 11. a plug; 12. axial through-flow passage.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

As shown in fig. 1, the present embodiment includes a water distribution body 1, and when water is injected, water in the injection string passes through the water distribution body 1 to reach the outside of the water distributor and then enters the ground. Specifically, the method comprises the following steps: processing has axial blind hole and axial to cross liquid passageway 12 in the water distribution main part 1, installs the valve member that has the one-way conduction function in the axial blind hole, processing has first liquid hole 10 on the inner wall that the liquid passageway 12 was crossed to the axial, processing has the water injection well choke 6 with the exit end intercommunication of valve member on the outer wall of water distribution main part 1, and during the water injection, the water that gets into axial and crosses liquid passageway 12 reaches the entry end of valve member through first liquid hole 10, then flows from the exit end of valve member, follows then water injection well choke 6 flows out, finally gets into the stratum. The above structures existing in the prior art are not described in detail herein.

As shown in fig. 1, the valve assembly comprises an upper valve seat 2, a valve ball 3, a lower valve seat 4, a spring 7 and a mandril 5; the upper valve seat 2, the valve ball 3, the lower valve seat 4 and the spring 7 are sequentially installed in the axial blind hole from top to bottom, the upper valve seat 2 is fixedly connected to the upper end of the axial blind hole, and the valve ball 3, the lower valve seat 4 and the spring 7 are packaged in the axial blind hole. And sealing conical surfaces matched with the valve ball 3 are processed at the lower end of the upper valve seat 2 and the upper end of the lower valve seat 4. The lower end of the ejector rod 5 is fixedly connected to the bottom of the axial blind hole; and in the state of not being installed in the well, the distance of not less than 5mm is reserved between the upper end of the mandril 5 and the valve ball 3. The lower valve seat 4 always keeps the moving trend of approaching the upper valve seat 2 under the elastic force of the spring 7. In the structure, the upper valve seat 2 and the lower valve seat 4 respectively form two valve structures with one-way conduction functions with the valve ball 3.

When the underground pressure is higher than the pressure in the pipe column, the valve ball 3 is pushed upwards and plugs the lower end of the upper valve seat 2, and the underground liquid can be prevented from flowing back through the matching of the valve ball 3 and the upper valve seat 2; when water injection is stopped and the formation pressure is less than the water pressure in the pipe column, the valve ball 3 falls down and plugs the upper end of the lower valve seat 4, and the valve ball 3 is matched with the lower valve seat 4, so that water in the pipe column can be prevented from flowing out, and reverse pumping of underground air or crude oil caused by natural outflow of water in the pipe column can be prevented, thereby achieving the purpose of completely avoiding backflow; when water injection is started, under the action of water injection pressure, the valve ball 3 and the lower valve seat 4 move downwards and overcome the elastic force of the spring 7, in the moving process, after the valve ball 3 is contacted with the ejector rod 5, the valve ball 3 stops moving downwards, and the lower valve seat 4 continues moving downwards, so that the valve ball 3 is separated from the lower valve seat 4, injected water is guaranteed to smoothly pass through the lower valve seat 4, and finally reaches the water nozzle 6.

As shown in fig. 1 and 3, the lower valve seat 4 is fixedly connected to the water distribution body 1 by means of a shear pin 8. Through the fixed action of the shear pin 8, before the water distributor goes into the well, the valve ball 3 is separated from the upper valve seat 2, the inside and outside communication in the process of going into the well is ensured, and extra resistance caused by the operation of going into the well is avoided.

In the prior art, sometimes it is necessary to install a plug 11 in the water distributor in order to adjust the drift diameter of the water injection channel by replacing the plug 11. The utility model discloses also can install blanking plug 11. As shown in fig. 4 and 5, in this embodiment, a mounting hole of a plug 11 is formed in the water distribution main body 1, the mounting hole of the plug 11 is communicated with the inside of the axial blind hole, the plug 11 is mounted in the mounting hole of the plug 11, the position of the first liquid passing hole 10 corresponds to the plug 11, and when water is injected, water enters the first liquid passing hole 10, passes through the plug 11, and then enters the axial blind hole. That is, when filling, the water first flows through the stopper 11 and then through the valve assembly, and in fig. 4, the arrows indicate the flow direction of the water when filling. In addition, fig. 5 is different from the water distribution body 1 in fig. 1 only in the presence or absence of the first liquid passing hole 10.

As shown in fig. 1, in practical application, the upper valve seat 2 is in sealing fit with the inner wall of the axial blind hole, and the lower valve seat 4 is in sliding sealing fit with the inner wall of the axial blind hole. The dimensional accuracy and surface roughness of the seal surface need to be noted during machining.

As shown in fig. 2, in practical implementation, a second liquid passing hole 9 is formed in the upper valve seat 2, and the second liquid passing hole 9 is directly or indirectly communicated with the first liquid passing hole 10, so that water entering the axial liquid passing channel 12 is introduced above the valve ball 3.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides an oil field is with eccentric injection mandrel, including water distribution main part (1), processing has axial blind hole and axial to cross liquid passageway (12) in water distribution main part (1), install the valve member that has the one-way function that switches on in the axial blind hole, processing has first liquid hole (10) of crossing on the inner wall that liquid passageway (12) was crossed to the axial, processing has water injection well choke (6) with the exit end intercommunication of valve member on the outer wall of water distribution main part (1), during the water injection, the water that gets into axial and cross liquid passageway (12) reaches the entry end of valve member through first liquid hole (10), then flows from the exit end of valve member, then follow water injection well choke (6) flow, finally get into the stratum, its characterized in that:

the valve component comprises an upper valve seat (2), a valve ball (3), a lower valve seat (4), a spring (7) and a mandril (5); the upper valve seat (2), the valve ball (3), the lower valve seat (4) and the spring (7) are sequentially installed in the axial blind hole from top to bottom, the upper valve seat (2) is fixedly connected to the upper end of the axial blind hole, and the valve ball (3), the lower valve seat (4) and the spring (7) are packaged in the axial blind hole;

the lower end of the upper valve seat (2) and the upper end of the lower valve seat (4) are both provided with sealing conical surfaces matched with the valve ball (3);

the lower valve seat (4) always keeps the movement trend of approaching the upper valve seat (2) under the action of the elastic force of the spring (7);

the lower end of the ejector rod (5) is fixedly connected to the bottom of the axial blind hole; and in the state of not going into the well and being installed, the distance which is not less than 5mm is reserved between the upper end of the mandril (5) and the valve ball (3).

2. The eccentric water distributor for oil field according to claim 1, characterized in that: the lower valve seat (4) is fixedly connected to the water distribution main body (1) through a shear pin (8).

3. The eccentric water distributor for oil field according to claim 1, characterized in that: still processing on water distribution main part (1) has blanking plug (11) mounting hole, blanking plug (11) mounting hole with the inside intercommunication of axial blind hole installs blanking plug (11) in blanking plug (11) mounting hole, the position of first liquid hole (10) of crossing corresponds with blanking plug (11), and during the water injection, water gets into and goes into in the axial blind hole behind first liquid hole (10) of crossing through blanking plug (11).

4. The eccentric water distributor for oil field according to claim 1, characterized in that: the upper valve seat (2) is in sealing fit with the inner wall of the axial blind hole, and the lower valve seat (4) is in sliding sealing fit with the inner wall of the axial blind hole.

5. The eccentric water distributor for oil field according to claim 1, characterized in that: and a second liquid passing hole (9) is processed on the upper valve seat (2), and the second liquid passing hole (9) is directly or indirectly communicated with the first liquid passing hole (10), so that water entering the axial liquid passing channel (12) is introduced above the valve ball (3).