CN217176568U

CN217176568U - Overflow well ash injection valve and overflow well ash injection pipe column

Info

Publication number: CN217176568U
Application number: CN202220808310.6U
Authority: CN
Inventors: 秦世群; 宋保建; 马宏伟; 林波; 朱雄军; 张峰
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: 2022-04-08
Filing date: 2022-04-08
Publication date: 2022-08-12
Anticipated expiration: 2032-04-08

Abstract

The utility model belongs to the technical field of the shutoff well, concretely relates to overflow well notes grey valve and overflow well notes grey tubular column in lower part stratum of seal. The overflow well ash injection valve comprises an upper connector, an outer cylinder and a lower connector which are sequentially connected with the lower end of the upper connector, wherein an inner cylinder is arranged on the outer cylinder or the lower connector, a flow passage is arranged in the inner cylinder or formed between the inner cylinder and the outer cylinder and communicated with the upper connector, and the inner cylinder is provided with a communicating hole which is communicated with the flow passage and an inner cavity of the inner cylinder and extends in the radial direction; the inner cylinder is provided with a one-way valve through a shear pin, the one-way valve is used for one-way conduction from top to bottom of liquid, and the one-way valve can hermetically slide relative to the inner cylinder after the shear pin is sheared; the one-way valve has a closed state for closing the communication hole, and when the one-way valve is in the closed state, the upper joint and the lower joint are communicated in a one-way mode through the one-way valve; the one-way valve is also provided with a backwashing state that the shear pin is pushed upwards by liquid after being sheared to open the communicating hole, and when the one-way valve is in the backwashing state, the upper joint and the lower joint are communicated.

Description

Overflow well ash injection valve and overflow well ash injection pipe column

Technical Field

The utility model belongs to the technical field of the shutoff well, concretely relates to overflow well notes grey valve and overflow well notes grey tubular column in lower part stratum of seal.

Background

Most oil fields are multilayer, the water content and the pressure of each stratum are different, the interlayer contradiction is more and more prominent in the development process, particularly in the later stage of water injection development, and a cement injection plug (namely, cement injection) is often needed to plug a high water-bearing stratum which is temporarily not used or is abandoned at the lower part. The general flow of the plugging process of the cement injection plug is that a cement injection plug pipe column is put into a casing pipe to set the depth position (the tail end is positioned above a to-be-sealed stratum), then clear water is used for cleaning a shaft in a positive circulation mode and cooling, cement slurry is injected into the well from the cement injection plug pipe column and is replaced by clear water, the cement slurry stays at the set position in the shaft, then the cement injection plug pipe column is lifted for about 2m, and the injection liquid in an annular space is used for carrying out reverse circulation well washing to wash out redundant cement slurry. In the reverse circulation well washing process, cement paste below 2m at the lower part of the tail end of the cement injection plug pipe column cannot be washed out, and a cement plug is formed after solidification.

During actual use, the upper stratum has the condition of overflow, injected cement slurry is flowable at the initial stage, and in the process of lifting the cement injection plug pipe column, the overflow of the upper stratum can return to the ground through the cement injection plug pipe column, and in the process of returning, the tail end of the cement injection plug pipe column is close to the bottom surface of the cement slurry in the well and can carry the cement slurry to return upwards, so that the cement slurry cannot be kept in the well for solidification.

Aiming at the problems existing in the process of upper overflow and lower cement injection, the prior method of firstly killing a well and then injecting the cement plug is generally adopted, namely, a well killing pipe column is firstly put in, and prepared well killing fluid is injected into the well through the well killing pipe column, so that the upper overflow is avoided. However, this approach has some drawbacks: the cost for preparing the well killing fluid is high, the well killing fluid needs to be injected firstly when the cement plug is injected, then the cement paste is injected, and then the well killing fluid is used as a displacement fluid, the well killing fluid has influence on the performance of the cement paste, the construction risk is high, and no proper well killing hydraulic well exists when the pressure of the upper part of the ground is high.

Therefore, technical staff improve and design the structure of tubular column to solve the overflow from structural improvement and easily carry the problem that grout went up to return, chinese utility model patent that grant publication number is CN201024982Y discloses a crowded notes control tool of cement, and it includes interconnect's top connection (be the upper portion casing in this patent) and bottom connection (be the lower part casing in this patent), and the top connection is used for linking to each other with oil pipe, installs the check valve in the top connection (be the two-way ball valve in this patent), and the check valve can realize from top to bottom one-way conduction around pouring into grout. When cement slurry is injected, the one-way valve is pushed away by the cement slurry, and after the cement slurry is injected, the one-way valve is in a closed state under the action of a spring contained in the one-way valve, so that the cement slurry in the well is prevented from returning upwards.

Among the crowded control tool of pouring of prior art's cement, solved the problem that returns on the grout through setting up the check valve, can be applicable to the operating mode of upper portion overflow, lower part cementing plug, but this kind of mode has some drawbacks: in the actual operation process, sometimes the condition that lifting equipment breaks down appears, and at this moment, if cement paste in the well is not washed out in time, once the cement paste begins to solidify, the accident that the cement paste solidifies the oil pipe will appear.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide an overflow well ash injection valve, which solves the technical problem that cement slurry is easy to fix an oil pipe when lifting equipment fails in the prior art; still provide a spill well notes grey tubular column to solve above-mentioned technical problem.

In order to achieve the purpose, the utility model provides an overflow well ash injection valve's technical scheme is: an overflow well ash injection valve comprises an upper joint used for being connected with an oil pipe, and further comprises an outer cylinder and a lower joint which are sequentially connected with the lower end of the upper joint, wherein an inner cylinder is arranged on the outer cylinder or the lower joint, a flow channel is arranged in the inner cylinder or formed between the inner cylinder and the outer cylinder and communicated with the upper joint, and the inner cylinder is provided with a communication hole which is communicated with the inner cavity of the inner cylinder and extends in the radial direction; the inner cylinder is provided with a one-way valve through a shear pin, the one-way valve is used for one-way conduction from top to bottom of liquid, and the one-way valve can hermetically slide relative to the inner cylinder after the shear pin is sheared; the one-way valve has a closed state for closing the communication hole, and when the one-way valve is in the closed state, the upper joint and the lower joint realize one-way conduction of liquid from top to bottom through the one-way valve; the one-way valve is also provided with a backwashing state in which the shear pin is sheared and then pushed upwards by liquid to open the communicating hole, and when the one-way valve is in the backwashing state, the upper joint and the lower joint are communicated with the inner cylinder through the flow channel, the communicating hole.

Has the advantages that: when water injection mud and the replacement clear water, the check valve is opened and is supplied liquid to pour into downwards, because liquid can pass through the check valve, can not apply too big effort to the check valve and cut the shear pin, when water injection mud finishes lifting the tubular column, the check valve seals, and the pressure of overflow is not enough to cut the shear pin in the well, prevents that the overflow from carrying the grout and returns ground on. When lifting means breaks down, can push away the check valve through the hole bottom upwards with the well-flushing liquid through the backwash, cut the shear pin, with top connection and lower clutch intercommunication to with grout backwash to subaerial, avoid appearing the condition that oil pipe is fixed by the grout. The utility model discloses a shear pin fixed mounting check valve through the shearing force of rational design shear pin, can guarantee that the shear pin can't be cut off under cement injection slurry, displacement clear water and overflow situation to liquid from the top down one-way circulation has been guaranteed.

Furthermore, the lower joint comprises a large hole section positioned above and a small hole section positioned below, the large hole section and the small hole section are matched to form an upward annular step, the inner cylinder is installed on the small hole section of the lower joint, and the outer cylinder is installed on the large hole section of the lower joint; the outer diameter of the inner cylinder is smaller than the inner diameters of the outer cylinder and the large hole section, so that the flow channel is an annular flow channel with the upper end communicated with the upper connector and the lower end closed, and the communication hole radially penetrates through the inner cylinder. The lower joint is used for installing the inner cylinder and the outer cylinder, the structure is simple, and meanwhile, the lower end of the annular flow channel is sealed by the annular step of the lower joint, so that liquid can only go upwards.

Furthermore, female threads are arranged at the lower end of the outer barrel, and male threads are arranged on the large hole section, so that the outer barrel is arranged outside the large hole section. The urceolus is installed in the outside of macropore section, compares the mode that the urceolus was installed in the inside of macropore section, guarantees the parallel and level of urceolus inner wall as far as possible, guarantees that liquid can go upward smoothly.

Furthermore, the upper end of the inner cylinder is provided with a stopping piece, the stopping piece is used for limiting the limit of upward movement of the one-way valve, and a passage for liquid to pass through is formed in the stopping piece. The one-way valve stops when moving to the position of the stopping piece, so that the one-way valve is prevented from continuously ascending to seal the upper joint, and the smooth upward return of the liquid is ensured.

Furthermore, an upper sealing ring and a lower sealing ring are arranged on the outer peripheral surface of the one-way valve, the upper sealing ring and the lower sealing ring are placed on the upper side and the lower side of the communicating hole when the one-way valve is in a closed state, and the upper sealing ring and the lower sealing ring are in sealing fit with the inner wall of the inner cylinder. The reliability of plugging the communicating hole by the check valve is ensured by arranging the upper sealing ring and the lower sealing ring.

The utility model discloses overflow well notes grey tubular column's technical scheme is: an overflow well ash injection pipe column comprises an oil pipe and an overflow well ash injection valve, wherein the overflow well ash injection valve comprises an upper joint connected with the oil pipe, and further comprises an outer cylinder and a lower joint which are sequentially connected with the lower end of the upper joint; the inner cylinder is provided with a one-way valve through a shear pin, the one-way valve is used for one-way conduction from top to bottom of liquid, and the one-way valve can hermetically slide relative to the inner cylinder after the shear pin is sheared; the one-way valve has a closed state for closing the communication hole, and when the one-way valve is in the closed state, the upper joint and the lower joint realize one-way conduction of liquid from top to bottom through the one-way valve; the one-way valve is also provided with a backwashing state in which the shear pin is pushed upwards by liquid after being sheared so as to open the communicating hole, and when the one-way valve is in the backwashing state, the upper joint and the lower joint are communicated with the inner cylinder through the flow channel and the communicating hole.

Furthermore, the overflow well cement injection pipe column further comprises a stopping structure connected below the overflow well cement injection valve, the stopping structure is used for supporting the one-way valve which falls downwards after the shear pins are cut off, and a passage for liquid to pass through is formed in the stopping structure. After the shear pin is cut off, when backwashing is not performed, the one-way valve can fall downwards under the dead weight, the one-way valve can be prevented from falling into a well through the arrangement of the blocking structure, the one-way valve can be repeatedly used, and a channel in the blocking structure ensures smooth flowing of liquid.

Drawings

Fig. 1 is a schematic view of an overflow well ash injection pipe column provided by the present invention in use;

FIG. 2 is a schematic diagram of the structure of the overflow well ash injection valve of FIG. 1;

description of reference numerals:

1. a sleeve; 2. an overflow well ash injection pipe column; 3. a bakelite stopper; 4. cement slurry; 5. an ash injection valve of the overflow well; 6. a cross; 7. an oil pipe; 100. an upper earth formation; 200. a lower earth formation; 51. an upper joint; 52. an outer cylinder; 53. a lower joint; 54. an inner barrel; 55. an annular flow passage; 56. a communicating hole; 57. shearing the nails; 58. a one-way valve; 581. a valve seat; 582. a valve ball; 583. a spring; 584. a baffle ring; 59. and (4) a cross block.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clear, the present invention is further described in detail 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, which may be present, 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, terms such as "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, elements recited by the phrases "comprising an … …," or the like, do not exclude the presence of such elements, processes, or methods.

In the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" when they are used are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; either directly or indirectly through intervening media, or may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those skilled in the art from the specific situation.

In the description of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the term "provided" may be used in a broad sense, for example, the object of "provided" may be a part of the body, or may be arranged separately from the body and connected to the body, and the connection may be a detachable connection or a non-detachable connection. The specific meaning of the above terms in the present invention can be understood by those skilled in the art from the specific situation.

The present invention will be described in further detail with reference to examples.

The utility model provides a concrete embodiment 1 of grey tubular column is annotated to overflow well:

as shown in fig. 1 and 2, the overflow well cement injection pipe column is suitable for the condition that the upper formation 100 overflows when the lower formation 200 is plugged, and the upper formation 100 and the lower formation 200 are only generally called and are not limited to only one layer. The overflow well ash injection pipe column 2 comprises an overflow well ash injection valve 5 and a cross fork 6 which are sequentially arranged from top to bottom, the overflow well ash injection valve 5 and the cross fork 6 are connected through an oil pipe 7 or directly connected, and the oil pipe 7 is connected above the overflow well ash injection valve 5 and below the cross fork 6.

The structure of the overflow well ash injection valve 5 is shown in fig. 2, the overflow well ash injection valve 5 comprises an upper joint 51, an outer cylinder 52 and a lower joint 53 which are sequentially connected from top to bottom, female threads are processed at the upper end and the lower end of the upper joint 51, and the upper end is connected with the oil pipe 7; the upper end of the outer cylinder 52 is provided with male threads, the lower end of the outer cylinder 52 is provided with female threads, and the male threads at the upper end of the outer cylinder 52 are connected with the female threads at the lower end of the upper connector 51; the upper end of the lower joint 53 is provided with male threads, and the male threads at the upper end of the lower joint 53 are connected with the female threads at the lower end of the outer cylinder 52. The upper joint 51, the outer cylinder 52, and the lower joint 53 are all vertically penetrating. Sealing rings are respectively arranged at the intersection position of the upper joint 51 and the outer cylinder 52 and the intersection position of the outer cylinder 52 and the lower joint 53.

Female threads are further formed in the inner side of the upper end of the lower connector 53, an inner cylinder 54 is mounted, the inner cylinder 54 is of a vertically-through cylindrical structure, and the inner cylinder 54 extends upwards from the lower connector 53. As shown in fig. 2, the outer diameter of the inner cylinder 54 is smaller than the inner diameter of the outer cylinder 52, and the upper end of the lower joint 53 includes a lower small hole section and an upper large hole section, which form an upward annular step, the inner cylinder 54 is screw-fitted on the small hole section, the inner diameter of the large hole section is larger than the outer diameter of the inner cylinder 54, the outer cylinder 52 and the lower joint 53 together form an annular flow passage 55, the upper end of the annular flow passage 55 communicates with the upper joint 51, and the lower end of the annular flow passage 55 is closed by the annular step of the lower joint 53.

As shown in fig. 2, a communication hole 56 is formed in a side wall of the inner cylinder 54, the communication hole 56 is a radial hole penetrating the inner cylinder 54, and the communication hole 56 communicates the annular flow passage 55 with the inside of the inner cylinder 54. A check valve 58 is slidably assembled in the inner cylinder 54, the check valve 58 can realize one-way flow of liquid from top to bottom, the check valve 58 comprises a valve seat 581, the periphery of the valve seat 581 is provided with a cylindrical surface, the valve seat 581 is slidably assembled with the inner cylinder 54, when the valve seat 581 corresponds to the communication hole 56, the valve seat 581 closes the communication hole 56, and the upper joint 51 is not communicated with the lower joint 53; when the valve seat 581 and the communicating hole 56 are staggered, a liquid flow channel communicated with the upper joint 51, the outer cylinder 52, the annular flow channel 55, the inner cylinder 54 and the lower joint 53 is formed in the overflow well dust injection valve 5. In order to ensure the reliability when the valve seat 581 seals the communication hole 56, two sealing rings are arranged on the periphery of the valve seat 581, and each sealing ring has two sealing rings, and when the valve seat 581 seals the communication hole 56, the two sealing rings are respectively arranged at the upper side and the lower side of the communication hole 56.

As shown in fig. 2, the valve seat 581 is mounted on the inner cylinder 54 through a shear pin 57, specifically, a blind hole is opened on the valve seat 581, a through threaded hole is opened on the inner cylinder 54, and the shear pin 57 is threaded through the inner cylinder 54 and pushed into the blind hole. When the valve seat 581 receives a vertical acting force smaller than the shearing force of the shear pin 57, the valve seat 581 is attached to the inner cylinder 54 via the shear pin 57, and when the valve seat 581 receives a vertical acting force larger than the shearing force of the shear pin 57, the shear pin 57 is sheared, and the valve seat 581 can slide vertically relative to the inner cylinder 54. Of course, in other embodiments, a blind threaded hole may be formed in the valve seat 581, a through-hole may be formed in the inner cylinder 54, and the shear pin 57 may be screwed into the blind threaded hole after passing through the inner cylinder 54.

The valve seat 581 is provided with a through hole, a downward valve port is arranged in the through hole, the check valve 58 further comprises a valve ball 582 for closing the valve port, a spring 583 for providing elastic pushing force for the valve ball 582 and a retaining ring 584, the retaining ring 584 is in threaded fit on the valve seat 581, the spring 583 is supported on the retaining ring 584, wherein the spring 583 and the valve ball 582 can be in a fixed connection relationship or only in a pushing relationship.

When cement slurry 4 is injected into the well or clean water is replaced, the cement slurry 4 or the clean water pushes the valve ball 582 and compresses the spring 583, the cement slurry 4 or the clean water can flow downwards through the one-way valve 58, the cement slurry 4 or the clean water can pass through the one-way valve 58, the valve seat 581 cannot bear overlarge pushing force, the shear pin 57 is not sheared, the one-way valve 58 seals the communication hole 56 at the moment, and the one-way valve 58 is in a closed state. When the well overflows, the valve ball 582 closes the valve port, the check valve 58 is closed, the well overflows and cannot carry cement slurry 4 upwards, when the well overflows, the check valve 58 bears upward acting force which is larger and exceeds the shearing force of the shear pin 57 during backwashing, the shear pin 57 is sheared, the check valve 58 is pushed upwards to expose the communication hole 56, the upper joint 51 is communicated with the lower joint 53, and at the moment, the check valve 58 is in a backwashing state.

As shown in fig. 2, when the check valve 58 is pushed upward, in order to limit the limit of the upward pushing of the check valve 58, the valve seat 581 is prevented from contacting the upper joint 51 to affect the flow of the liquid therethrough. First, the upper end of the inner cylinder 54 is spaced apart from the upper joint 51 by a predetermined distance, the cross stopper 59 is welded to the upper end of the inner cylinder 54, the cross stopper 59 is formed by two support rods crossing each other, and the cross stopper 59 can block the valve seat 581 and allow the water slurry 4 or the clean water to pass therethrough.

As shown in fig. 1, the spider 6 serves to prevent the one-way valve 58 from falling down to the bottom of the well after the shear pin 57 is sheared, and the spider 6 includes a tube body in which two mutually intersecting struts are fixed, through which fluid can pass but which can block the one-way valve 58.

The utility model discloses overflow well notes grey tubular column 2's use includes following step:

(1) and pushing a bakelite plug 3 to the position of a cement injection plug by a lower overflow well cement injection pipe column 2 in the sleeve 1, wherein the descending depth of an overflow well cement injection valve 5 is equal to the descending depth of the overflow well cement injection pipe column 2 minus the depth of a back-washing well of which the pipe column is lifted after plugging.

(2) Replacing cement paste 4 and replacing clear water according to the design amount.

(3) If the lifting equipment works normally, executing the steps (4) to (6) according to the following steps; if the lifting device fails at this time, the following steps are performed (7) to (9).

(4) And (5) the sleeve is kept in an open state, the overflow well ash injection pipe column 2 is lifted to the position of the backwashing well, and the overflow well ash injection valve 5 is detached.

(5) The well is back-washed to wash out excess cement slurry 4.

(6) And lifting the oil pipe to the surface of the cement plug for waiting for setting for more than 100 meters.

(7) Pumping flushing liquid from the casing 1, cutting off the shear pin 57 when the pressure difference reaches a certain value, and communicating the overflow well ash injection valve 5 from bottom to top.

(8) And pumping the well washing liquid from the casing 1 to back wash the cement slurry 4 in the well to the ground, so as to prevent accidents such as the cement slurry 4 fixing the oil pipe 7 and the like.

(9) And (4) pumping cement plugs again after the lifting equipment is maintained, and starting to execute the step (2).

Of course, in other embodiments, if a solid cement plug is injected from the bottom of the well, the bakelite plug 3 need not be run in.

In practice, in step (4), the overflow well cement valve 5 may not be removed, and the overflow well cement valve 5 may be opened to allow the liquid to return upward during backwashing.

In this embodiment, the cross stop 59 serves to limit the upward travel limit of the check valve 58, thereby forming a stop fixed to the upper end of the inner barrel 54, and a passage is provided in the stop for the passage of liquid. In other embodiments, the structure of the stopping member may be modified, such as a mesh plate.

In this embodiment, the spider 6 forms a stop structure for holding the one-way valve 58, and the stop structure has a passage for liquid to pass through. In other embodiments, the type of stop structure may be modified, such as a mesh plate. In other embodiments, the stop structure may be eliminated and the one-way valve may be dropped downhole, but still be used for a single shot of cement.

In this embodiment, when the check valve 58 is in the closed state, the upper seal ring is located above the communication hole 56 and the lower seal ring is located below the communication hole 56 among the seal rings outside the check valve 58.

In this embodiment, the lower end of the outer cylinder 52 is threadedly fitted to the outside of the large bore section in the outer cylinder 52. In other embodiments, the lower end of the outer barrel 52 is threadably mounted within the interior of the large bore section in the outer barrel 52.

In this embodiment, the lower joint 53 includes a lower small hole section and an upper large hole section to form an upward annular step closing the lower end of the annular flow passage 55, and the inner cylinder 54 is mounted on the lower joint 53. In other embodiments, the inner cylinder 54 is mounted on the outer cylinder 52, and in order to form an annular flow passage, specifically, the inner cylinder 54 includes a lower large-diameter section and an upper small-diameter section, the large-diameter section and the small-diameter section cooperate to form an upward step, the large-diameter section is connected with the outer cylinder 52, the small-diameter section forms an annular flow passage with the outer cylinder 52 and the inner cylinder 54, and the communication hole 56 is located on the small-diameter section.

In this embodiment, the flow passage formed between the inner cylinder 54 and the outer cylinder 52 is an annular flow passage 55. In other embodiments, the flow channel is an axial flow channel disposed on the sidewall of the inner cylinder 54, the axial flow channel extends up and down, and the communication hole 56 is a blind hole and is connected to the axial flow channel.

In this embodiment, a stopper is fixed to the upper end of the inner tube 54 to limit the upward limit of the check valve 58. In other embodiments, the stopper is eliminated, and the check valve 58 is stopped by the upper joint, and at this time, in order to ensure smooth flow of the liquid, a radial groove is formed in the top surface of the check valve 58 to communicate the flow passage with the upper joint through the radial groove, but an axially extending axial groove may be formed in the outer peripheral surface of the upper end of the check valve 58 to communicate the flow passage with the radial groove.

The utility model discloses overflow well notes grey valve's embodiment:

the structure of the overflow well ash injection valve is the same as that of the overflow well ash injection pipe column, and the detailed description is omitted.

Finally, it should be noted that the above mentioned embodiments are only preferred embodiments of the present invention, and not intended to limit the present invention, and although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that the technical solutions described in the foregoing embodiments may be modified without inventive effort, or some technical features may be substituted equally. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An overflow well ash injection valve comprising an upper sub (51) for connection to an oil pipe (7), characterized in that: the connector is characterized by further comprising an outer cylinder (52) and a lower connector (53) which are sequentially connected with the lower end of the upper connector (51), wherein an inner cylinder (54) is arranged on the outer cylinder (52) or the lower connector (53), a flow channel is arranged in the inner cylinder (54) or formed between the inner cylinder (54) and the outer cylinder (52) and communicated with the upper connector (51), and the inner cylinder (54) is provided with a communicating hole (56) which is communicated with the inner cavity of the inner cylinder (54) and extends in the radial direction; a one-way valve (58) is arranged in the inner cylinder (54) through a shear pin (57), the one-way valve (58) is used for conducting liquid from top to bottom in a one-way mode, and the one-way valve (58) can slide relative to the inner cylinder (54) in a sealing mode after the shear pin (57) is sheared; the one-way valve (58) has a closed state for closing the communication hole (56), and when the one-way valve (58) is in the closed state, the one-way conduction of liquid from top to bottom is realized between the upper joint (51) and the lower joint (53) through the one-way valve (58); the one-way valve (58) is also provided with a backwashing state in which the shear pins (57) are pushed upwards by liquid after being sheared to open the communicating holes (56), and when the one-way valve (58) is in the backwashing state, the upper joint (51) and the lower joint (53) are communicated with each other through the flow channel, the communicating holes (56) and the inner cylinder (54).

2. The spill well ash valve of claim 1, wherein: the lower joint (53) comprises a large hole section positioned above and a small hole section positioned below, the large hole section and the small hole section are matched to form an upward annular step, the inner cylinder (54) is installed on the small hole section of the lower joint (53), and the outer cylinder (52) is installed on the large hole section of the lower joint (53); the outer diameter of the inner cylinder (54) is smaller than the inner diameters of the outer cylinder (52) and the large hole section, so that the flow channel is an annular flow channel (55) with the upper end communicated with the upper connector (51) and the lower end closed, and the communication hole (56) penetrates through the inner cylinder (54) in the radial direction.

3. The spill well ash valve of claim 2, wherein: female threads are arranged at the lower end of the outer barrel (52), and male threads are arranged on the large hole section, so that the outer barrel (52) is arranged outside the large hole section.

4. An overflow well ash valve according to any of claims 1-3, characterized in that: the upper end of the inner cylinder (54) is provided with a stop member for limiting the upward movement limit of the check valve (58), and the stop member is provided with a passage for liquid to pass through.

5. An overflow well ash valve according to any of claims 1-3, characterized in that: an upper sealing ring and a lower sealing ring are arranged on the outer peripheral surface of the one-way valve (58), the upper sealing ring and the lower sealing ring are arranged on the upper side and the lower side of the communicating hole (56) when the one-way valve (58) is in a closed state, and the upper sealing ring and the lower sealing ring are in sealing fit with the inner wall of the inner cylinder (54).

6. The utility model provides an overflow well notes grey tubular column, includes oil pipe (7) and overflow well notes grey valve (5), and overflow well notes grey valve (5) include top connection (51) that link to each other with oil pipe (7), its characterized in that: the connector is characterized by further comprising an outer cylinder (52) and a lower connector (53) which are sequentially connected with the lower end of the upper connector (51), wherein an inner cylinder (54) is arranged on the outer cylinder (52) or the lower connector (53), a flow channel is arranged in the inner cylinder (54) or formed between the inner cylinder (54) and the outer cylinder (52) and communicated with the upper connector (51), and the inner cylinder (54) is provided with a communicating hole (56) which is communicated with the inner cavity of the inner cylinder (54) and extends in the radial direction; a one-way valve (58) is arranged in the inner cylinder (54) through a shear pin (57), the one-way valve (58) is used for conducting liquid from top to bottom in a one-way mode, and the one-way valve (58) can slide relative to the inner cylinder (54) in a sealing mode after the shear pin (57) is sheared; the one-way valve (58) has a closed state for closing the communication hole (56), and when the one-way valve (58) is in the closed state, the one-way conduction of liquid from top to bottom is realized between the upper joint (51) and the lower joint (53) through the one-way valve (58); the one-way valve (58) is also provided with a backwashing state in which the shear pins (57) are pushed upwards by liquid after being sheared to open the communicating holes (56), and when the one-way valve (58) is in the backwashing state, the upper joint (51) and the lower joint (53) are communicated with each other through the flow channel, the communicating holes (56) and the inner cylinder (54).

7. The spill well cement injection string according to claim 6, wherein: the lower joint (53) comprises a large hole section positioned above and a small hole section positioned below, the large hole section and the small hole section are matched to form an upward annular step, the inner cylinder (54) is installed on the small hole section of the lower joint (53), and the outer cylinder (52) is installed on the large hole section of the lower joint (53); the outer diameter of the inner cylinder (54) is smaller than the inner diameters of the outer cylinder (52) and the large hole section, so that the flow channel is an annular flow channel (55) with the upper end communicated with the upper connector (51) and the lower end closed, and the communication hole (56) penetrates through the inner cylinder (54) in the radial direction.

8. The spill well cement injection string according to claim 7, wherein: female threads are arranged at the lower end of the outer barrel (52), and male threads are arranged on the large hole section, so that the outer barrel (52) is arranged outside the large hole section.

9. The spillwell cementing string according to any one of claims 6 to 8, wherein: the upper end of the inner cylinder (54) is provided with a stop member for limiting the upward movement limit of the check valve (58), and the stop member is provided with a passage for liquid to pass through.

10. The spillwell cementing string according to any one of claims 6 to 8, wherein: the overflow well cement injection pipe column (2) further comprises a stopping structure connected below the overflow well cement injection valve (5), the stopping structure is used for supporting the one-way valve (58) which falls downwards after the shear pin (57) is sheared, and a passage for liquid to pass through is formed in the stopping structure.