CN212927792U

CN212927792U - Moving bottom plug and pump sealing integrated water finding and plugging pipe column

Info

Publication number: CN212927792U
Application number: CN202021592168.3U
Authority: CN
Inventors: 秦世群; 王登辉; 宋保建; 马宏伟; 王霖; 崔本敬; 代吉建; 何德海; 郑壮
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 moving about end stifled and pump seal an organic whole look for stifled water pipe post. The bottom block moves about, includes: the pipe wall of the central pipe is provided with a communicating hole; the sleeve is sleeved on the central tube and forms an annular cavity with the central tube, the upper part of the annular cavity is of a closed structure, and the lower part of the annular cavity is provided with a communicating channel; the annular piston is sleeved on the central pipe and is assembled in the annular 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 annular cavity and is used for applying downward elastic acting force to the annular piston; the communicating hole is used for communicating a pipe cavity of the central pipe with a cavity part of the annular cavity above the annular piston, and the communicating channel is used for communicating the cavity part of the annular cavity below the annular piston with an oil sleeve annulus below the lower packer. The design is convenient for lowering, setting and lifting the pipe string for unsealing.

Description

Moving bottom plug and pump sealing integrated water finding and plugging pipe column

Technical Field

The utility model relates to a moving about end stifled and pump seal an organic whole look for stifled water pipe post.

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 tubular column that looks for commonly used in the water shutoff operation at present is pump seal integrative two seals look for the water shutoff tubular column, as shown in figure 1, this tubular column has connected gradually packer 2 on oil pipe 6 under oil-well pump 1, screen pipe 3, packer 4 and plug 5 down, when single-production lower floor oil reservoir 8, because 6 end connection of oil pipe has plug 5, can form the dead space between 6, two packers are located the sleeve pipe 7 and the oil pipe 6 below packer 4 after sitting and sealing, consequently can form piston effect at 4 deblocking in-process down, lead to the deblocking load increase, the deblocking difficulty, cause unable deblocking and overhaul even. 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 movable bottom plug to solve 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 realize the purpose, the utility model discloses the technical scheme of end stifled that moves about is:

the bottom block moves about, includes:

the pipe wall of the central pipe is provided with a communicating hole;

the sleeve is sleeved on the central tube and forms an annular cavity with the central tube, the upper part of the annular cavity is of a closed structure, and the lower part of the annular cavity is provided with a communicating channel;

the annular piston is sleeved on the central pipe and is assembled in the annular 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 annular cavity and is used for applying downward elastic acting force to the annular piston;

the communicating hole is used for communicating a pipe cavity of the central pipe with a cavity part of the annular cavity above the annular piston, and the communicating channel is used for communicating the cavity part of the annular cavity below the annular piston with an oil sleeve annulus below the lower packer.

The beneficial effects are that: when the pipe column is lowered for setting, the annular piston arranged in the annular cavity slides upwards under the action of the pressure of liquid at the lower part of the annular piston, 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 of the packer is facilitated; when the tubular column lifts the deblocking, the annular piston that sets up in the annular cavity slides downwards under the pressure effect of its upper portion liquid, has reduced the cavity volume of packer below down, avoids taking out the space below the packer into vacuum, is favorable to the deblocking of packer.

Further, the communication channel is an annular channel.

The beneficial effects are that: to facilitate the ingress and egress of liquid into and out of the annular cavity.

Furthermore, the annular piston is provided with annular sealing rings at the radial inner side and the radial outer side of the annular piston, and the annular sealing ring at the inner side and the annular sealing ring at the outer side of the annular piston are provided with at least two annular sealing rings along the axial direction of the central pipe.

The beneficial effects are that: to ensure the sealing performance of the annular piston during sliding.

Furthermore, the floating bottom plug also comprises an upper joint, the upper part of the central pipe is in threaded connection with the inside of the upper joint, the upper part of the sleeve is in threaded connection with the outside of the upper joint, and the part of the upper joint between the upper part of the central pipe and the upper part of the sleeve forms the closed structure.

The beneficial effects are that: the lower joint is in threaded connection with the central tube to facilitate the installation of the elastic member, the annular piston and the sleeve.

Furthermore, the floating bottom plug also comprises a lower joint, the lower part of the central pipe is connected inside the lower joint in a threaded manner, and the lower part of the sleeve and the lower joint form the communication channel.

The beneficial effects are that: the upper joint is in threaded connection with the central tube to facilitate the installation of the elastic element, the annular piston and the sleeve.

Furthermore, a step structure is arranged on the outer side of the lower joint, the inner side surface of the lower portion of the sleeve is arranged at intervals with the vertical surface of the step structure, and the end surface of the lower portion of the sleeve is arranged at intervals with the tread of the step structure, so that the communicating channel is formed.

The beneficial effects are that: the design ensures that the radial size of the floating bottom plug in the central pipe is relatively small, and the floating bottom plug is convenient to drop into the well.

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 are prevented from entering the annular cavity, and the failure of the floating bottom plug caused by the blocking of the annular piston is avoided.

Further, the communication hole is arranged at the upper part of the annular cavity.

The beneficial effects are that: under the condition of the same annular cavity, the reciprocating stroke of the annular piston is ensured.

Further, the communicating hole is a straight hole extending along the radial direction of the central tube.

The beneficial effects are that: because impurity is along vertical direction downward deposit, consequently impurity is difficult to enter into the intercommunicating pore, and then avoids impurity to cause the influence to the annular piston through the intercommunicating pore entering annular chamber is internal.

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:

the pipe wall of the central pipe is provided with a communicating hole;

the elastic piece is arranged in the annular cavity and used for applying downward elastic acting force to the annular piston so that the annular piston is positioned at the lowest part of the annular cavity in an initial state;

Further, the communication channel is an annular channel.

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

The beneficial effects are that: therefore, impurities can be deposited in a sand setting pocket formed above the plug, the impurities are prevented from entering the annular cavity, and the failure of the floating bottom plug caused by the blocking of the annular piston is avoided.

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;

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 and 3: 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-upper joint; 31-a first sealing ring; 32-a communication hole; 33-a central tube; 34-a sleeve; 35-a pressure spring; 36-an annular piston; 37-a second seal ring; 38-a communication channel; 39-lower joint; 40-ring-shaped cavity.

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 central pipe 33, the central pipe 33 extends vertically, and the central pipe 33 is of a hollow structure.

In this embodiment, the upper portion of the center tube 33 is provided with the upper joint 30, and the lower portion of the center tube 33 is provided with the lower joint 39. Specifically, the upper part of the central tube 33 is provided with external threads, the upper joint 30 is provided with internal threads, and the upper part of the central tube 33 is connected inside the upper joint 30 in a threaded manner; the lower portion of the center tube 33 is provided with an external thread, the lower joint 39 is provided with an internal thread, and the lower portion of the center tube 33 is screwed inside the lower joint 39. Wherein, the upper joint 30 and the lower joint 39 are both of a vertical through structure, so that impurities are deposited in the sand setting pocket above the plug. In other embodiments, the lower connector may be a plug structure, and a sand setting pocket is formed in the space above the lower connector, and at this time, a plug is not arranged below the floating bottom plug.

As shown in fig. 3, the floating bottom plug 29 further comprises a sleeve 34, the sleeve 34 is sleeved on the central tube 33, and the sleeve 34 and the central tube 33 enclose an annular cavity 40; an annular piston 36 is arranged in the annular cavity 40, and the annular piston 36 is sleeved on the central pipe 33 and used for adjusting the cavity volume below the lower packer 24.

In this embodiment, a second sealing ring 37 is disposed between the inner side surface of the annular piston 36 and the outer peripheral surface of the central tube 33 and between the outer side surface of the annular piston 36 and the inner side surface of the sleeve 34, so that the annular piston 36 is slidably and sealingly fitted in the annular cavity 40. Two of the second sealing rings 37 on the inner side and the second sealing rings 37 on the outer side of the annular piston 36 are arranged along the axial direction of the central tube 33, so that the sealing performance is improved. In other embodiments, the number of the second sealing rings can be set according to requirements.

A pressure spring 35 is arranged in the annular cavity 40, and the pressure spring 35 is located above the annular piston 36 and is used for applying a downward elastic acting force to the annular piston 36 so that the annular piston is located at the lowest part of the annular cavity in an initial state. Preferably, the number of the compression springs 35 is one, and the compression springs 35 are sleeved on the central pipe 33 so as to ensure the stability of the compression springs 35 in the stretching process. Wherein the pressure spring 35 constitutes an elastic element.

In this embodiment, the outer side of the upper joint 30 is provided with external threads, the upper portion of the sleeve 34 is provided with internal threads, the upper portion of the sleeve 34 is screwed on the outer portion of the upper joint 30, and the portion of the upper joint 30 between the upper portion of the central tube 33 and the upper portion of the sleeve 34 forms a closed structure of the annular cavity 40. Wherein, a first sealing ring 31 is arranged between the outer side of the upper joint 30 and the inner side of the sleeve 34, and two first sealing rings 31 are arranged along the axial direction of the sleeve 34 to ensure the sealing performance of the closed structure.

In this embodiment, the upper portion of the lower joint 39 is provided with an annular step structure, the lower portion of the sleeve 34 is located above the step structure, the inner side surface of the lower portion of the sleeve 34 is spaced from the vertical surface of the step structure, and the lower end surface of the sleeve 34 is spaced from the tread surface of the step structure to form the communication channel 38. Wherein, the communication channel 38 is an annular channel, and the cross section of the annular channel is L-shaped. In other embodiments, the upper part of the lower joint is not provided with a step structure, the inner side surface of the lower part of the sleeve and the outer periphery of the upper part of the lower joint form an annular communication channel, and the cross section of the communication channel is I-shaped.

Wherein the communication passage 38 is used to communicate the portion of the annular cavity 40 below the annular piston 36 with the oil jacket annulus below the lower packer 24.

In this embodiment, the wall of the central tube 33 is provided with a communication hole 32, and the communication hole 32 communicates the lumen of the central tube 33 with the cavity portion of the annular cavity 40 above the annular piston 36. Preferably, the communication hole 32 is provided at an upper portion of the annular chamber 40, so that the annular chamber 40 has a smaller axial length along the central tube 33 while ensuring the reciprocating stroke of the annular piston 36.

In this embodiment, the communicating hole 32 is a straight hole extending along the radial direction of the central tube 33, and since the impurities are deposited downward along the vertical direction, the impurities are not easy to enter the communicating hole 32, and further the impurities are prevented from entering the annular cavity 40 through the communicating hole 32 to affect the annular piston 36.

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, a water plugging pipe column is lowered into the sleeve 27 to a designed depth, liquid in a well enters the annular cavity 40 through the communicating channel 38 in the lowering process, so that the annular piston 36 in the annular cavity 40 bears upward liquid pressure, at the moment, the pressure spring 35 can provide acting force opposite to the direction of the liquid pressure for the annular piston 36, namely, the pressure spring 35 provides downward elastic acting force to buffer the annular piston 36, the annular piston 36 is prevented from directly sliding to the upper side, and the annular cavity 40 provides a space for the annular piston 36 to move upwards when the packer is set; meanwhile, the pressure spring 35 can also realize the resetting of the annular piston 36 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 when the lowest oil layer 28 is mined, 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 annular piston 36 to move upwards by overcoming the elastic action force of the pressure spring 35, and meanwhile, the liquid above the annular piston 36 enters the cavity of the central tube 33 through the annular cavity 40 and the communication hole 32, so that the cavity volume 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 channel and a cavity part of the annular cavity below the annular 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, annular piston 36 moves down under the effect of negative pressure, reduce the cavity volume of packer 24 below down, and simultaneously, liquid in the center tube 33 cavity is through the intercommunicating pore 32, annular cavity 40 enters into annular piston 36 top, prevent that the space below packer 24 is taken out into the vacuum down, 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 annular piston 36 when the packer is set and unset to balance the up and down pressure of the annular piston 36.

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. Impurities in the produced liquid can be deposited downwards above the plug 25, and the impurities are prevented from entering the annular cavity 40 through the communication hole 32 and depositing on the annular piston 36 to block the annular piston 36, so that the floating bottom plug is prevented from losing efficacy. 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 embodiment 1 is that, in embodiment 1, the elastic member is a pressure spring 35, the pressure spring 35 is located above the annular piston 36, the number of the pressure springs 35 is one, and the pressure springs are sleeved on the central tube 33 to apply a downward elastic acting force to the annular piston 36, in this embodiment, the elastic member is a tension spring, the tension spring is located below the annular piston, and the number of the tension springs is one, and the tension spring is sleeved on the central tube to apply a downward elastic acting force to the annular 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, the elastic member is a pressure spring 35, the pressure spring 35 is located above the annular piston 36, the number of the pressure springs 35 is one, and the pressure springs are sleeved on the central tube 33 to apply downward elastic acting force to the annular piston 36, in this embodiment, the number of the pressure springs is multiple, the multiple pressure springs are arranged in the annular cavity at intervals along the circumferential direction of the central tube, and the multiple pressure springs apply downward elastic acting force to the annular piston together.

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

the difference from the specific embodiment 1 is that in embodiment 1, an annular step structure is arranged on the upper portion of the lower joint 39, the lower portion of the sleeve 34 is located above the step structure, the inner side surface of the lower portion of the sleeve 34 is arranged at intervals with the vertical surface of the step structure, and the lower end surface of the sleeve 34 is arranged at intervals with the tread surface of the step structure to form an annular communication channel 38.

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

the difference from the specific embodiment 1 is that in the embodiment 1, the outer side of the upper joint 30 is provided with an external thread, the upper part of the sleeve 34 is provided with an internal thread, the upper part of the sleeve 34 is connected with the outer part of the upper joint 30 in a threaded manner, and the part of the upper joint 30 between the upper part of the central pipe 33 and the upper part of the sleeve 34 forms a closed structure of the annular cavity 40.

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

the difference from the specific embodiment 1 is that in the embodiment 1, the central pipe 33 is connected with the upper joint 30 and the lower joint 39 through threads so as to facilitate the installation of the compression spring 35, the annular piston 36 and the sleeve 34, and in the embodiment, the central pipe is integrated with the upper joint and is connected with the lower joint through threads so as to facilitate the installation of the compression spring, the annular piston and the sleeve. In other embodiments, the central tube is integrally disposed with the lower fitting and is threadably connected to the upper fitting to facilitate installation of the compression spring, annular piston, and sleeve.

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

the difference from the specific embodiment 1 is that in the embodiment 1, the lower joint 39 is arranged separately from the sleeve 34, a communication channel 38 is formed between the lower joint 39 and the sleeve 34, and the communication channel 38 is used for communicating the cavity part of the annular cavity below the annular piston with the oil jacket annulus below the lower packer. In this embodiment, lower clutch and sleeve integrative setting are equipped with the through-hole along center tube axial extension on the lower clutch, and the through-hole is used for communicating the annular space of oil jacket below packer down with the cavity part of ring chamber cavity below annular piston.

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

the difference from embodiment 1 is that in embodiment 1, the communication hole 32 is a straight hole extending in the radial direction of the central tube 33 to prevent the entry of the foreign matter into the communication hole, and in this embodiment, the communication hole is an inclined hole extending in the radial direction of the central tube, and the inner side orifice of the communication hole faces downward to prevent the entry of the foreign matter into the communication hole.

The utility model discloses the concrete embodiment of the end stifled that moves about, should move about end stifled and above-mentioned pump seal an organic whole look for in the concrete embodiment 1 to 8 of stifled tubular column any the structure of the 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 bottom of swimming blocks up, its characterized in that includes:

the pipe wall of the central pipe is provided with a communicating hole;

2. The traveling bottom block according to claim 1, wherein said communication passage is an annular passage.

3. A travelling bottom plug according to claim 1 or 2, characterised in that the annular piston is provided with annular sealing rings on both the radially inner and outer sides thereof, at least two of which are provided on both the inner and outer sides of the annular piston in the axial direction of the central tube.

4. A travelling bottom plug according to claim 1 or 2, characterized in that it further comprises an upper nipple, the upper part of the central tube being screwed inside the upper nipple, the upper part of the sleeve being screwed outside the upper nipple, the part of the upper nipple between the upper part of the central tube and the upper part of the sleeve constituting said closure.

5. A travelling bottom block according to claim 1 or 2, characterized in that it further comprises a lower joint, the lower part of the central tube being screwed inside the lower joint, said communication channel being formed between the lower part of the sleeve and the lower joint.

6. The traveling bottom plug according to claim 5, characterized in that a step structure is arranged on the outer side of the lower joint, the inner side surface of the lower part of the sleeve is arranged at a distance from the vertical surface of the step structure, and the end surface of the lower part of the sleeve is arranged at a distance from the tread surface of the step structure, so as to form the communication channel.

7. The traveling bottom block according to claim 5, wherein the lower joint is a vertical through structure.

8. A travelling bottom closure according to claim 1 or 2, characterised in that said communication aperture is provided in the upper part of the annular chamber.

9. A travelling bottom closure according to claim 1 or 2, characterised in that the communication holes are straight holes extending in radial direction of the central tube.

10. 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;

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.