CN212927791U

CN212927791U - Pump-sealing integrated water finding and blocking pipe column and moving bottom block thereof

Info

Publication number: CN212927791U
Application number: CN202021592166.4U
Authority: CN
Inventors: 秦世群; 宋保建; 王登辉; 张峰; 林波; 陈旭波; 代吉建; 郑壮; 王宇睿
Original assignee: China Petroleum and Chemical Corp; Sinopec Henan Petroleum Exploration Bureau No 1 Oil Production Plant
Current assignee: China Petroleum and Chemical Corp; Sinopec Henan Petroleum Exploration Bureau No 1 Oil Production Plant
Priority date: 2020-08-04
Filing date: 2020-08-04
Publication date: 2021-04-09
Anticipated expiration: 2030-08-04

Abstract

The utility model relates to a pump seals integrative looks for stifled tubular column and moves about end stifled. The integrative end of moving about of looking for stifled water pipe post of pump seal is stifled, includes: a cylinder having a communication passage extending in an up-down direction; the piston cavity is arranged on the cylinder body and extends along the vertical direction, the piston cavity and the communication channel are arranged at intervals in the radial direction of the cylinder body, and the lower part of the piston cavity is communicated with the communication channel; the piston is assembled in the piston cavity in a sliding and sealing mode so as to adjust the volume of the cavity below the lower packer; the elastic piece is arranged in the piston cavity and is used for applying upward elastic acting force to the piston; and the overflowing channel is arranged on the cylinder and is used for communicating the cavity part of the piston cavity above the piston with the oil sleeve annulus below the lower packer. The design is convenient for lowering, setting and lifting the pipe string for unsealing.

Description

Pump-sealing integrated water finding and blocking pipe column and moving bottom block thereof

Technical Field

The utility model relates to a pump seals integrative looks for stifled tubular column and moves about end stifled.

Background

In the middle and later stages of oil field development, particularly in the later stage of exploitation of water injection oil field, along with the change of the water content of the stratum, the interval division is thinner and thinner, the contradiction between the layers is more and more prominent, the high and low aquifers coexist, and in order to know the oil layer and stabilize and control oil and water, water plugging operation is often needed. The common tubular column in the water finding and plugging operation at present is a pump-sealing integrated double-sealing water finding and plugging tubular column, as shown in figure 1, the tubular column is sequentially connected with an upper packer 2, a sieve tube 3, a lower packer 4 and a plug 5 on an oil tube 6 under an oil well pump 1, when a lowest oil layer 8 is singly produced, because the tail of the oil tube 6 is connected with the plug 5, a dead cavity can be formed between a sleeve 7 below the lower packer 4 and the oil tube 6 after the two packer seats are sealed, and therefore, a piston effect can be formed in the lower packer 4 deblocking process, so that deblocking load is increased, deblocking is difficult, and even the situation that deblocking cannot be carried out and overhaul is caused. In addition, the produced fluid of the poorly consolidated stratum contains fine silt, and in the late exploitation stage of the water injection oil field, along with the increase of the displacement multiple of the injected water, the injected water of some oil reservoirs can damage the consolidated matters in the stratum, and the produced fluid of the stratum contains fine silt. The fine silt can deposit in the oil pipe under certain tubular column environment in the pit, and the downhole tool is buried dead by the deposit, so that the downhole tool fails.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a pump seal integrated floating bottom plug of a water plugging pipe column, which solves the technical problems of the prior art that the deblocking load is increased and the deblocking is difficult because a piston effect is formed in the deblocking process of a lower packer; an object of the utility model is to provide a pump seals an organic whole and looks for stifled water pipe post to packer deblocking in-process can form the piston effect under solving prior art, leads to the technical problem of deblocking load increase, deblocking difficulty.

In order to achieve the purpose, the utility model discloses the integrative end stifled technical scheme who moves about who looks for stifled water pipe post of pump seal is:

the integrative end of moving about of looking for stifled water pipe post of pump seal is stifled, includes:

a cylinder having a communication passage extending in an up-down direction;

the piston cavity is arranged on the cylinder body and extends along the vertical direction, the piston cavity and the communication channel are arranged at intervals in the radial direction of the cylinder body, and the lower part of the piston cavity is communicated with the communication channel;

the piston is assembled in the piston cavity in a sliding and sealing mode so as to adjust the volume of the cavity below the lower packer;

the elastic piece is arranged in the piston cavity and is used for applying upward elastic acting force to the piston;

and the overflowing channel is arranged on the cylinder and is used for communicating the cavity part of the piston cavity above the piston with the oil sleeve annulus below the lower packer.

The beneficial effects are that: when the setting seal is placed down on the pipe column, the piston arranged in the piston cavity slides downwards under the action of the pressure of liquid at the upper part of the piston cavity, so that the volume of the cavity below the lower packer is increased, the liquid pressure in the space below the lower packer is reduced, and the setting seal of the packer is facilitated; when the tubular column is lifted for deblocking, the piston arranged in the piston cavity slides upwards under the pressure action of liquid at the lower part of the piston cavity, so that the volume of the cavity below the lower packer is reduced, the space below the lower packer is prevented from being vacuumized, and the deblocking of the packer is facilitated.

Further, the cylinder body comprises a cylinder body and a lower joint, the lower joint is in threaded connection with the lower portion of the cylinder body, the piston cavity is located on the cylinder body, the elastic part is a pressure spring arranged in the piston cavity, a stopping part is arranged at an opening of the lower portion of the piston cavity on the cylinder body to stop the lower end of the pressure spring, and the stopping part is provided with a communicating hole communicating the piston cavity and the communicating channel.

The beneficial effects are that: the lower joint is in threaded connection with the cylinder body, so that the pressure spring and the piston are conveniently installed.

Further, the stopping piece is a stopping ring which can be detachably connected to the barrel body.

The beneficial effects are that: the disassembly and the assembly of the pressure spring are convenient.

Further, the baffle ring is in threaded connection with the cylinder body.

The beneficial effects are that: the mode of threaded connection makes the dismouting comparatively simple and convenient, keeps off the stability of ring after screwing moreover better, is difficult to not hard up.

Furthermore, the lower joint is of an up-and-down through structure.

The beneficial effects are that: therefore, impurities can be deposited in a deposition pocket formed above the plug, the impurities can not enter the piston cavity, and the failure of the floating bottom plug caused by the blockage of the piston is avoided.

Furthermore, the outer peripheral surface of the piston is provided with at least two annular sealing rings which are arranged at intervals along the axial direction of the cylinder body.

The beneficial effects are that: through setting up two ring type sealing to guarantee the sealing performance of piston slip in-process.

Further, the communicating channel is provided with an eccentric hole section, and the piston cavity and the eccentric hole section are arranged at intervals in the radial direction of the cylinder body.

The beneficial effects are that: the design is convenient for arranging the piston cavity on the cylinder body.

Furthermore, the cross section of the eccentric hole section and the cross section of the piston cavity are both circular.

The beneficial effects are that: the cross-sectional area of the piston is increased, and the length of the whole tool is reduced.

Furthermore, a stopping step is arranged in the cylinder and used for stopping the upper side face of the piston, and the overflowing channel is arranged above the stopping step.

In order to achieve the purpose, the utility model discloses pump seals integrative technical scheme who looks for stifled water pipe post is:

integrative water shutoff tubular column of looking for of pump seal includes:

the oil pipe comprises an oil pump, an upper packer, a sieve pipe, a lower packer and a plug which are sequentially connected from top to bottom;

be connected with between packer and the plug and move about the end and block, it includes to move about the end and block:

a cylinder having a communication passage extending in an up-down direction;

Further, the baffle ring is in threaded connection with the cylinder body.

Furthermore, the lower joint is of an up-and-down through structure.

Drawings

FIG. 1 is a schematic structural diagram of a pump-seal integrated double-seal water finding and blocking pipe column in the prior art;

fig. 2 is a schematic structural view of a specific embodiment 1 of the pump-sealing integrated water plugging pipe column of the present invention;

FIG. 3 is a schematic structural view of the floating bottom plug of FIG. 2;

FIG. 4 is a cross-sectional view A-A of FIG. 3;

in fig. 1: 1-oil well pump; 2-setting a packer; 3-a sieve tube; 4-lower packer; 5-plugging with a thread; 6-oil pipe; 7-a sleeve; 8-oil layer;

in fig. 2 to 4: 21-oil well pump; 22-upper packer; 23-a screen; 24-lower packer; 25-plug; 26-oil pipe; 27-a cannula; 28-oil layer; 29-floating bottom block; 30-a barrel body; 31-a communication channel; 32-an overflow hole; 33-a piston; 34-a pressure spring; 35-a piston cavity; 36-a baffle ring; 37-a communicating hole; 38-lower joint; 39-eccentric hole section; 40-ring seal ring; 41-upper joint.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention, i.e., the described embodiments are only some, but not all embodiments of the invention. The components of embodiments of the present invention, as 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 accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiment of the present invention, all other embodiments obtained by the person skilled in the art without creative work belong to the protection scope of the present invention.

It is noted that relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element. Furthermore, the terms "upper" and "lower" are based on the orientation and positional relationship shown in the drawings and are only for convenience of description of the present invention, and do not indicate that the referred device or component must have a specific orientation, and thus, should not be construed as limiting the present invention.

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

The utility model discloses pump seals integrative specific embodiment 1 who looks for stifled water pipe post:

as shown in fig. 2, the pump-sealing integrated water finding and plugging pipe column comprises an oil pipe 26, the oil pipe 26 comprises pipe column sections which are sequentially connected in series, the upper part of the oil pipe 26 is connected with an oil well pump 21, the upper end of the oil well pump 21 is connected with a sucker rod, and the sucker rod drives the oil well pump 21 to perform oil pumping operation. An upper packer 22 and a lower packer 24 are connected to the tubing 26 below the pump 21, and the upper packer 22 and the lower packer 24 are spaced apart in the up-down direction to separate oil zones 28.

In this embodiment, the upper packer 22 is a Y111 packer, and the lower packer 24 is a Y211 packer, wherein the Y111 packer and the Y211 packer are mature products in the prior art, and are not described herein again.

Wherein, the oil pipe 26 is connected with a sieve tube 23, the sieve tube 23 is positioned between the upper packer 22 and the lower packer 24, the bottom of the oil pipe 26 is also connected with a plug 25, the plug 25 is positioned below the lower packer 24, and the plug 25 and the lower packer 24 have a certain distance to form a sand setting pocket.

As shown in fig. 2 and 3, a floating bottom plug 29 is arranged between the plug 25 and the lower packer 24, the floating bottom plug 29 comprises a cylinder 30, the cylinder 30 is provided with a communication channel 31, and the communication channel 31 extends along the up-and-down direction; the cylinder 30 further has a piston chamber 35, the piston chamber 35 extends in the up-down direction, the piston chamber 35 and the communication passage 31 are arranged at an interval in the radial direction of the cylinder 30, and the lower end of the piston chamber 35 communicates with the communication passage 31.

As shown in FIG. 3, a piston 33 is arranged in the piston cavity 35, an annular sealing ring 40 is arranged on the outer peripheral surface of the piston 33, and the piston 33 is in sliding sealing fit in the piston cavity 35 so as to adjust the cavity volume below the lower packer 24. In this embodiment, two annular seal rings 40 are provided at intervals along the axial direction of the cylinder to ensure the sealing performance during the sliding of the piston 33.

A compression spring 34 is arranged in the piston cavity 35, and the compression spring 34 is located below the piston 33 and is used for applying an upward elastic acting force to the piston 33 so as to press the piston 33 against a stop step at the upper part of the piston cavity 35. Wherein the compression spring 34 constitutes an elastic element.

In this embodiment, the cylinder 30 is provided with an overflowing hole 32, and the overflowing hole 32 extends along the radial direction of the cylinder 30 and is located above the stopping step; the overflow hole 32 is above the upper limit of the piston 33 to communicate the portion of the cavity of the piston chamber 35 above the piston 33 with the oil jacket annulus below the lower packer 24. Wherein the flow-through holes 32 constitute a flow-through channel.

In this embodiment, the lower portion of the piston cavity 35 is detachably connected with a retaining ring 36, and the retaining ring 36 is used for retaining the lower end of the pressure spring 34; preferably, retainer ring 36 is threaded into piston cavity 35 to allow for removable attachment of retainer ring 36, and retainer ring 36 is removably attached to piston cavity 35 to facilitate removal of compression spring 34 and piston 33. Wherein the stop ring 36 constitutes a stop. In other embodiments, the stopping member is a baffle plate, and a plurality of communicating holes are uniformly distributed on the baffle plate.

Wherein the retainer ring 36 has a communication hole 37, and the communication hole 37 is used for communicating the chamber body portion of the piston chamber 35 below the piston 33 and the communication passage 31.

As shown in fig. 3 and 4, the communication passage 31 includes an eccentric hole section 39, the piston cavity 35 is arranged at a corresponding interval with the eccentric hole section 39, and the lower end of the piston cavity 35 is flush with the lower end of the eccentric hole section 39; in this embodiment, the cross section of the piston chamber 35 and the cross section of the eccentric hole section 39 are both circular, and the cross sectional area of the piston chamber 35 is larger than the cross sectional area of the eccentric hole section 39.

In this embodiment, the cylinder 30 includes a cylinder body and a lower joint 38, the upper portion of the lower joint 38 is provided with an internal thread, the lower joint 38 is screwed on the cylinder body, the lower portion of the lower joint 38 is provided with an external thread, and the lower joint 38 is connected with a corresponding tubular column through the external thread; the lower joint 38 is a through structure to allow impurities to be deposited in a sand trap pocket above the plug. In other embodiments, the lower joint may be a plug structure, and a sand setting pocket is formed in the space above the lower joint, so that the plug is not arranged below the floating bottom plug, but the lower joint is ensured to be long enough.

Wherein, the upper portion of a section of thick bamboo body is equipped with top connection 41, is equipped with the internal thread on the top connection 41, and top connection 41 is connected with corresponding tubular column through the internal thread. Wherein the piston chamber 35 is provided on the cartridge body.

As shown in FIG. 2, the sieve tube 23 is arranged close to the lower packer 24 and far away from the upper packer 22, preferably, the lower part of the sieve tube 23 is directly screwed on the upper part of the lower packer 24, so that impurities such as mud, fine silt and the like in the produced liquid are not easily deposited in the annular space of the oil jacket above the lower packer 24, the lower packer 24 is prevented from being buried by the deposited impurities, and the normal lifting and lowering of the oil pipe 26 are ensured.

When the packer is used, the pump seal is integrated to find a water plugging pipe column and set into the sleeve 27 to a designed depth, liquid in a well can enter the piston cavity 35 through the flow hole 32 in the setting process, so that the piston 33 in the piston cavity 35 bears downward liquid pressure, at the moment, the pressure spring 34 can provide acting force opposite to the liquid pressure direction for the piston 33, namely, the pressure spring 34 provides upward elastic acting force to buffer the piston 33, the piston 33 is prevented from directly sliding to the lower side, and the piston cavity 35 provides space for the piston 33 to move downwards when the packer is set; meanwhile, the pressure spring 34 can also realize the resetting of the piston 33 when the liquid pressure disappears, so that the oil pipe 26 can conveniently perform the next action.

Setting and unsetting of the packer are both accomplished within a fixed stroke, setting the packer during single production of the lowest oil layer 28, raising the string, and lowering the string to set the upper packer 22 and the lower packer 24. In the setting process, the oil sleeve annulus below the lower packer 24 is extruded, liquid in the oil sleeve annulus below the lower packer 24 pushes the piston 33 to overcome the elastic force of the pressure spring 34 to move downwards, and meanwhile, the liquid below the piston 33 enters the communicating channel 31 of the cylinder body through the piston cavity 35 and the communicating hole 37, so that the volume of the cavity below the lower packer 24 is increased, the liquid pressure below the lower packer 24 is reduced, and the setting of the packer is facilitated. Wherein the cavity volume below the lower packer comprises an oil sleeve annulus, a communication hole and a cavity part of the piston cavity above the piston.

When the deblocking, lift the tubular column, make packer 22 and lower packer 24 all shift up to the deblocking position, the cavity volume of packer 24 below can produce the negative pressure down this moment, piston 33 upwards moves under the effect of negative pressure, reduce the cavity volume of packer 24 below down, and simultaneously, liquid in communicating channel 31 of barrel 30 enters into the piston 33 below through intercommunicating pore 37, piston chamber 35, prevent that the space below packer 24 is taken out into the vacuum, thereby because the resistance that piston effect need overcome when reducing the deblocking packer, the deblocking of the packer of being convenient for.

The piston effect is eliminated by the up-and-down sliding of the piston 33 when the packer is set and unset to balance the up-and-down pressure of the piston 33.

During pumping, when the pump 21 is in operation, production fluid enters the tubing 26 through the screen 23 and is pumped through the pump 21. The impurities in the produced liquid can be deposited downwards in the sand setting pocket above the plug 25, and the phenomenon that the floating bottom plug fails due to the fact that the impurities enter the piston cavity 35 through the communicating hole 37 to block the piston cavity is avoided. In addition, the sieve tube 23 is arranged close to the lower packer 24, so that impurities in produced liquid are not easy to deposit too much in an oil sleeve annulus above the lower packer 24, and the failure caused by the dead burying of the lower packer 24 is avoided.

The utility model discloses pump seals integrative specific embodiment 2 who looks for stifled water pipe post:

the difference from the specific embodiment 1 is that in embodiment 1, the elastic member is a compression spring 34, the compression spring 34 is located below the piston 33 to apply upward elastic force to the piston 33, and in this embodiment, the elastic member is a tension spring, and the tension spring is located above the piston to apply upward elastic force to the piston.

The utility model discloses pump seals integrative specific embodiment 3 who looks for stifled water pipe post:

the difference from embodiment 1 is that in embodiment 1, a retaining ring 36 is detachably connected to the lower portion of the piston cavity 35, and the retaining ring 36 is used for retaining the lower end of the pressure spring 34.

The utility model discloses pump seals integrative specific embodiment 4 who looks for stifled water pipe post:

the difference from the embodiment 1 is that in the embodiment 1, a stop ring 36 is detachably connected to the lower portion of the piston cavity 35, and the stop ring 36 is used for stopping the lower end of the pressure spring 34.

The utility model discloses pump seals integrative specific embodiment 5 who looks for stifled water pipe post:

the difference from the embodiment 1 is that in the embodiment 1, the communication passage 31 includes the eccentric hole section 39, and the piston cavity 35 is arranged at a distance corresponding to the eccentric hole section 39, and in this embodiment, the communication passage is a straight hole extending in the up-down direction, and the piston cavity is arranged at a distance corresponding to a part of the communication passage.

The utility model discloses pump seals integrative specific embodiment 6 who looks for stifled water pipe post:

the difference from the embodiment 1 is that in the embodiment 1, the cross section of the piston cavity 35 and the cross section of the eccentric hole section 39 are both circular, and in the embodiment, the cross section of the piston cavity and the cross section of the eccentric hole section are both elliptical. In other embodiments, the cross-section of the piston cavity and the cross-section of the eccentric bore section may both be polygonal, such as rectangular.

The utility model discloses pump seals integrative specific embodiment 7 who looks for stifled water pipe post:

the difference from the embodiment 1 is that in the embodiment 1, the cross-sectional area of the piston chamber 35 is larger than that of the eccentric hole section 39. In this embodiment, the cross-sectional area of the piston bore is equal to the cross-sectional area of the eccentric bore section. In other embodiments, the cross-sectional area of the piston bore 35 may be less than the cross-sectional area of the eccentric bore section 39.

The utility model discloses pump seals integrative specific embodiment 8 who looks for stifled water pipe post:

the difference from the specific embodiment 1 is that in the embodiment 1, the cylinder 30 is provided with an overflowing hole 32, and the overflowing hole 32 extends along the radial direction of the cylinder 30 to communicate the cavity part of the piston cavity 35 above the piston 33 with the oil jacket annulus below the lower packer 24, wherein the overflowing hole forms an overflowing channel. In this embodiment, the overflow hole is the inclined hole that radially extends along a section of thick bamboo body, and the outside drill way slant of intercommunicating pore is upwards to the cavity part of intercommunication piston chamber above the piston and the oil jacket annular space of packer below down.

The utility model discloses the integrative concrete embodiment who looks for the end stifled that moves about of stifled water pipe post is sealed to the pump, should move about end stifled and above-mentioned pump seal integrative look for in the concrete embodiment 1 to 8 of stifled water pipe post any the structure of end stifled that moves about the same, no longer give consideration to here.

The above description is only for the preferred embodiment of the present invention, and the present invention is not limited thereto, the protection scope of the present invention is defined by the claims, and all structural changes equivalent to the contents of the description and drawings of the present invention should be included in the protection scope of the present invention.

Claims

1. The integrative end of moving about of looking for stifled water pipe post of pump seal is stifled, its characterized in that includes:

a cylinder having a communication passage extending in an up-down direction;

2. The pump seal integrated traveling bottom plug for water plugging tubular columns according to claim 1, wherein the cylinder comprises a cylinder body and a lower connector, the lower connector is connected to the lower portion of the cylinder body in a threaded manner, the piston chamber is located on the cylinder body, the elastic member is a compression spring arranged in the piston chamber, a stop member is arranged at the lower opening of the piston chamber on the cylinder body to stop the lower end of the compression spring, and the stop member is provided with a communication hole communicating the piston chamber and the communication channel.

3. The pump seal integrated floating bottom plug for a water plugging pipe string according to claim 2, wherein the stop member is a stop ring detachably connected to the barrel body.

4. The pump seal integrated floating bottom plug for a water plugging pipe column according to claim 3, wherein the baffle ring is in threaded connection with the barrel body.

5. The pump seal integrated floating bottom plug for the water plugging pipe column according to any one of claims 2 to 4, wherein the lower connector is of an up-and-down through structure.

6. The pump seal integrated floating bottom plug for the water plugging pipe column according to any one of claims 1 to 4, wherein the outer peripheral surface of the piston is provided with at least two annular sealing rings which are arranged at intervals along the axial direction of the cylinder body.

7. The pump seal integrated floating bottom plug for water plugging pipe column according to any one of claims 1-4, wherein said communicating channel has an eccentric hole section, and said piston cavity and said eccentric hole section are arranged at a distance in the radial direction of the cylinder.

8. The floating bottom plug of the pump seal integrated water plugging pipe column according to claim 7, wherein the cross section of the eccentric hole section and the cross section of the piston cavity are both circular.

9. The pump seal integrated floating bottom plug for water plugging pipe columns according to any one of claims 1 to 4, wherein a stopping step is arranged in the cylinder body and used for stopping the upper side face of the piston, and the overflowing channel is arranged above the stopping step.

10. Integrative water shutoff tubular column of looking for of pump seal includes:

the packer is characterized in that a movable bottom plug is connected between the lower packer and the plug, and the movable bottom plug is the movable bottom plug in any one of claims 1-9.