CN209742842U - Injection pipe column and prevent oil feed ball seat thereof - Google Patents
Injection pipe column and prevent oil feed ball seat thereof Download PDFInfo
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- CN209742842U CN209742842U CN201821587651.5U CN201821587651U CN209742842U CN 209742842 U CN209742842 U CN 209742842U CN 201821587651 U CN201821587651 U CN 201821587651U CN 209742842 U CN209742842 U CN 209742842U
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- sealing
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Abstract
The utility model relates to a separate injection tubular column and prevent oil feed ball seat thereof, prevent the oil feed ball seat including the tubulose pedestal that has central passageway, the tubulose pedestal includes the ball seat section, still includes water conservancy diversion section and the seal segment that is connected with the ball seat section and arranges from top to bottom in proper order, seal guide in the seal segment is equipped with the piston rod that is used for packing off the central passageway, is connected with the shear pin that can cut between seal segment and the piston rod, and the water conservancy diversion section has the chamber that breaks away from the sealed cooperation with the seal segment, to the stopper portion of upwards keeping off the piston rod in the tubulose pedestal, the piston rod is after pushing away the effect and moving up to the water conservancy diversion section in and form the water conservancy diversion passageway that makes the central passageway switch on from top to bottom between the water conservancy diversion section, and tubulose pedestal lower extreme has the export, can prevent external oil cap from getting into, and can automatic feed, the structure is simpler, and the underground operation is convenient.
Description
Technical Field
The utility model relates to a split injection tubular column and prevent oil feed ball seat thereof.
Background
In the process of oil field exploitation, separate-layer water injection is generally adopted to improve the recovery ratio of an oil well, a common injection tubular column comprises a packer connected with the tubular column, a water distributor and a ball valve positioned at the bottom of the tubular column, an instrument is frequently required to test the water injection amount during water injection, the oil and water in the stratum can flow back into a well shaft of the water injection well due to the fact that the oil and water are communicated between oil-water well layers and are influenced by the fact that the injection well stops injecting water and the stratum pressure changes, and oil and water in the stratum can float on the surface of water to form. Conventional ball valve comprises ball and ball seat, and the tubular column of annotating is when the oil cap, and the tubular column is annotated to the liquid top-opening ball entering in oil and the pit shaft, and the adhesion causes the tubular column inner chamber to diminish at the tubular column inner wall, and the testing instrument passes through the difficulty, and the test meets and hinders, rework operation even.
The utility model discloses a prevent oil feed valve in the chinese utility model patent document of grant bulletin number CN2530028Y, should prevent oil feed valve contain upper and lower connector, spheroid and lower ball seat, be sliding fit between lower ball seat and the lower connector, be equipped with the shear pin that can cut between the two, be the last ball seat with lower connector threaded connection on the spheroid, be equipped with the liquid hole on the last ball seat, in the work process of reality, because the spheroid does not have the leeway between upper and lower ball seat, the tubular column centre bore is by the shutoff all the time at the in-process of going into the well, outside fluid of tubular column and other impurity can not get into, the inside of water injection tubular column is not polluted, do not influence the performance of other equipment on the tubular column. During construction water injection, in the process of pressing and releasing the upper packer of the pipe column, the shear pin between the lower ball seat and the lower joint is cut off, the valve ball moves downwards along with the lower ball seat, the normal valve function is recovered, and the process of separate layer water injection is carried out.
However, in the actual operation process, the ball body is clamped between the upper ball seat and the lower ball seat and cannot move upwards, so that the central channel is always in a closed state in the water discharging process of the separate injection pipe column, and when the separate injection pipe column continues to go down the well after passing through the oil cap, in order to avoid overlarge pressure difference between the inner pressure and the outer pressure of the pipe column, water needs to be continuously filled into the pipe column in the pipe column dropping process so as to maintain the pressure difference between the inner pressure and the outer pressure of the pipe column within a stable range; meanwhile, the ball body is always seated on the lower ball seat, and the requirements of well washing and seal checking can not be met.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide an oil inlet prevention ball seat to solve the problem that the structural design and operation process of an oil inlet prevention valve in the prior art are complicated; an object of the utility model is to provide an use this prevent annotating tubular column of annotating of oil feed ball seat to solve the problem that the tubular column of annotating among the prior art operates more complicatedly when the tubular column is gone down.
In order to achieve the above object, the utility model discloses a prevent technical scheme of oil feed ball seat is:
The oil inlet preventing ball seat comprises a tubular seat body with a central passage, the tubular seat body comprises a ball seat section for supporting a thrown ball body to seal the central passage, a flow guide section and a sealing section which are connected with the ball seat section and are sequentially arranged from top to bottom, the sealing section is internally provided with a piston rod for sealing and separating the central channel in a sealing and guiding way, a shearable shear pin is connected between the sealing section and the piston rod, the flow guide section is provided with an accommodating cavity for the piston rod to move upwards to enter so as to be separated from the sealing section and be in sealing fit after the shear pin is sheared by the piston rod under upward pressure, the tubular seat body is internally provided with a stopping part for stopping the piston rod upwards after the piston rod moves upwards and is separated from sealing fit with the sealing section, the piston rod moves upwards into the flow guide section under the action of pushing, a flow guide channel for communicating the central channel up and down is formed between the piston rod and the flow guide section, and the lower end of the tubular seat body is provided with an outlet for the piston rod to move downwards to leave the tubular seat body.
The beneficial effects are that: compared with the prior art, the oil inlet prevention ball seat provided by the utility model has the advantages that through the arrangement of the ball seat section, the flow guide section and the sealing section, and the arrangement of the shear pin, the blocking part and the flow guide channel, in the actual operation process, when the tubular column passes through the oil cap, the piston rod seals the central channel through the sealing fit of the shear pin and the sealing section, and the oil cap cannot enter the tubular column, so that the problems that the oil cap is adhered to the inner wall of the tubular column, the inner cavity of the tubular column is reduced, and a test instrument is difficult to pass can be avoided; after the pipe column passes through the oil cap, the pressure difference between the inside and the outside of the pipe column is gradually increased along with the continuous increase of the depth of the pipe column in the well, the hydraulic pressure outside the pipe column upwards pushes the piston rod, when the pressure reaches a certain value, the shear pin is cut off, the pushing piston rod moves upwards, the piston rod moves into the flow guide section by the pushing, is stopped in the flow guide section by the stop of the ball seat section, meanwhile, the flow guide channel between the flow guide section and the piston rod enables the central channel to be communicated up and down, and the liquid in the well enters the pipe. After the tubular column is lowered to the set depth, the piston rod is pressed into the tubular column through the oil pipe and separated from the sealing section downwards, and the piston rod is separated from the outlet of the tubular seat body, so that the bottom of the tubular column central channel is completely opened, operation procedures such as well washing, seal checking and the like can be performed at the moment, and after well washing and seal checking are completed, a ball body is thrown in from the upper end of the tubular column and falls on the ball seat section, so that the bottom channel of the tubular column is blocked, and water injection operation is performed after the qualified deployment. The oil inlet preventing ball seat can prevent an external oil cap from entering, can automatically feed liquid after passing the oil cap without irrigation, is simple and convenient to operate, can meet the requirements of well washing and seal checking, and is simple in structure and convenient for underground operation.
Furthermore, in order to conveniently remove the sealing between the piston rod and the sealing section, the piston rod and the sealing section are in sealing fit through a sealing ring sleeved on the piston rod, and a sealing failure part which is arranged at an interval with the sealing ring so as to enable the sealing ring to fail is arranged in the accommodating cavity.
Furthermore, in order to facilitate machining of the flow guide channel, the diameter of the piston rod is smaller than the inner diameter of the flow guide section, the sealing failure part is formed by an annular interval between the piston rod and the flow guide section, a flow guide structure which is communicated with the annular interval to conduct the central channel up and down when the piston rod moves upwards into the flow guide section by pushing is further arranged on the piston rod, and the annular interval and the flow guide structure form the flow guide channel. The structure form that annular interval and water conservancy diversion structure communicate is directly adopted, only can realize the structure of passageway through the footpath difference, and the structure is fairly simple.
Furthermore, in order to facilitate processing of the flow guide structure, the flow guide structure is a flow guide open slot which is arranged on the upper end surface of the piston rod and extends along the radial direction of the piston rod in a two-way manner.
Furthermore, in order to ensure simple and compact internal structure of the tubular seat body, the ball seat section is of a necking structure with a wide upper part and a narrow lower part, the inner diameter of the lower end of the ball seat section is smaller than the diameter of the piston rod, and the stop part is formed by the lower end face of the ball seat section.
The utility model discloses a separate injection tubular column's technical scheme is:
The dispensing pipe column comprises a pipe column body, the lower end of the pipe column body is connected with an oil inlet preventing ball seat, the lower end of the oil inlet preventing ball seat is connected with a sieve pipe, the oil inlet preventing ball seat comprises a tubular seat body with a central channel, the dispensing pipe column is matched with a ball body which is used for being thrown into the oil inlet preventing ball seat, the tubular seat body comprises a ball seat section which is in supporting fit with the thrown ball body to seal the central channel, a flow guide section and a sealing section which are connected with the ball seat section and are sequentially arranged from top to bottom, a piston rod which is used for sealing the central channel is assembled in the sealing section in a sealing and guiding mode, a shearable shear pin is connected between the sealing section and the piston rod, the flow guide section is provided with a containing cavity which enables the piston rod to move upwards to enter the sealing section to be separated from sealing fit after the piston rod moves upwards and is separated from sealing fit with the sealing section, the piston rod moves upwards into the flow guide section under the action of pushing, a flow guide channel for communicating the central channel up and down is formed between the piston rod and the flow guide section, and the lower end of the tubular seat body is provided with an outlet through which the piston rod moves downwards to leave the tubular seat body.
The beneficial effects are that: compared with the prior art, the utility model relates to a separate injection tubular column, through preventing the setting of the ball seat section on the oil feed ball seat, water conservancy diversion section and sealing section to and shear pin and the overall arrangement of stop portion, water conservancy diversion passageway, in the actual operation in-process, when the tubular column passes through the oil cap, the piston rod seals off the central passage through shear pin and sealing section sealed fit this moment, and the oil cap can't get into the tubular column at this moment, can avoid the oil cap to adhere to the tubular column inner wall like this, cause the tubular column inner chamber to diminish, the problem of testing instrument pass difficulty; after the pipe column passes through the oil cap, the pressure difference between the inside and the outside of the pipe column is gradually increased along with the continuous increase of the depth of the pipe column in the well, the hydraulic pressure outside the pipe column upwards pushes the piston rod, when the pressure reaches a certain value, the shear pin is cut off, the pushing piston rod moves upwards, the piston rod moves into the flow guide section by the pushing, is stopped in the flow guide section by the stop of the ball seat section, meanwhile, the flow guide channel between the flow guide section and the piston rod enables the central channel to be communicated up and down, and the liquid in the well enters the pipe. After the tubular column is lowered to the set depth, the piston rod is pressed into the tubular column through the oil pipe and separated from the sealing section downwards, and the piston rod is separated from the outlet of the tubular seat body, so that the bottom of the tubular column central channel is completely opened, operation procedures such as well washing, seal checking and the like can be performed at the moment, and after well washing and seal checking are completed, a ball body is thrown in from the upper end of the tubular column and falls on the ball seat section, so that the bottom channel of the tubular column is blocked, and water injection operation is performed after the qualified deployment. The oil inlet preventing ball seat can prevent an external oil cap from entering, can automatically feed liquid after passing the oil cap without irrigation, is simple and convenient to operate, can meet the requirements of well washing and seal checking, and is simple in structure and convenient for underground operation.
Furthermore, in order to conveniently remove the sealing between the piston rod and the sealing section, the piston rod and the sealing section are in sealing fit through a sealing ring sleeved on the piston rod, and a sealing failure part which is arranged at an interval with the sealing ring so as to enable the sealing ring to fail is arranged in the accommodating cavity.
Furthermore, in order to facilitate machining of the flow guide channel, the diameter of the piston rod is smaller than the inner diameter of the flow guide section, the sealing failure part is formed by an annular interval between the piston rod and the flow guide section, a flow guide structure which is communicated with the annular interval to conduct the central channel up and down when the piston rod moves upwards into the flow guide section by pushing is further arranged on the piston rod, and the annular interval and the flow guide structure form the flow guide channel. The structure form that annular interval and water conservancy diversion structure communicate is directly adopted, only can realize the structure of passageway through the footpath difference, and the structure is fairly simple.
Furthermore, in order to facilitate processing of the flow guide structure, the flow guide structure is a flow guide open slot which is arranged on the upper end surface of the piston rod and extends along the radial direction of the piston rod in a two-way manner.
Furthermore, in order to ensure simple and compact internal structure of the tubular seat body, the ball seat section is of a necking structure with a wide upper part and a narrow lower part, the inner diameter of the lower end of the ball seat section is smaller than the diameter of the piston rod, and the stop part is formed by the lower end face of the ball seat section.
drawings
Fig. 1 is the utility model discloses a prevent oil feed ball seat's specific embodiment's structural schematic.
Description of reference numerals: 1-a tubular seat body; 2-a ball seat section; 3-a flow guide section; 4-a sealing section; 5-a piston rod; 6-sealing ring; 7-cutting nails; 11-internal screw thread; 12-external threads; 13-a central channel; 21-a stopper; 51-diversion open grooves.
Detailed Description
The following describes embodiments of the present invention with reference to the accompanying drawings.
The utility model discloses a prevent concrete embodiment of oil feed ball seat, as shown in FIG. 1, should prevent that the oil feed ball seat is applied to and divides the tubular column, including tubulose pedestal 1, the upper end of tubulose pedestal 1 is equipped with internal thread 11, and the lower extreme is equipped with external screw thread 12, and the upper end of tubulose pedestal 1 is connected with the tubular column body lower tip of dividing the tubular column, and screen pipe and plug are connected to the lower extreme of tubulose pedestal 1.
The inner hole of the tubular base body 1 forms a central channel 13 for liquid to pass through, and the tubular base body 1 comprises a ball seat section 2, a flow guide section 3 and a sealing section 4 which are sequentially connected from top to bottom. The ball seat section 2 is arranged below the internal thread 11, is of a necking structure with a wide upper part and a narrow lower part, is used for supporting a ball body thrown from the upper end of a separate injection pipe column, and is matched with the ball body in a mutual conical surface manner to seal a central channel 13; a piston rod 5 is installed in the sealing section 4 in a penetrating manner along the up-down direction, an annular sealing groove is arranged on the outer peripheral surface of the piston rod 5, the piston rod 5 is in sealing fit with the sealing section 4 through a sealing ring 6 arranged in the annular sealing groove, so that a central channel 13 is sealed, meanwhile, a shear pin 7 is installed on the piston rod 5 and the sealing section 4 in a penetrating manner along the radial direction, the position of the piston rod 5 can be limited through the arrangement of the shear pin 7, so that the piston rod 5 is ensured to be positioned in the sealing section 4, the shear pin 7 can be sheared after being subjected to a shearing force to enable the piston rod 5 to be separated from the limiting fit between the sealing section 4, then the piston rod 5 can be pushed upwards into the flow guide section 3 and downwards moved out of the sealing section 4 under the pressure, it needs to be specially described that the inner diameter of the lower end part of the ball seat section 2 is smaller than the diameter of the piston rod, the piston rod 5 is prevented from moving upward out of the tubular seat body 1 by the lower end surface of the ball seat section 2 being in a stop-fit with the piston rod 5, and a stop portion 21 for stop-fit with the piston rod 5 is formed on the lower end surface of the ball seat section 2.
The inner diameter of the flow guide section 3 is larger than the diameter of the piston rod 5, so that the piston rod 5 moves up to the flow guide section 3 and after the sealing ring 6 enters the inner cavity of the flow guide section, an annular space is formed between the flow guide section 3 and the piston rod 5 due to the arrangement of the size structure, meanwhile, a flow guide open groove 51 radially extending to the outer side wall of the piston rod 5 is arranged at the upper end of the piston rod 5, so that a channel at the ball seat section 2 can be communicated with a channel at the sealing section 4 after passing through the flow guide open groove 51 and the annular space, and further the integral up-and-down communication of the central channel 13 is realized, the inner cavity of the flow guide section 3 forms a containing cavity containing the piston rod 5, and the annular space forms a sealing failure part which is arranged at a distance from the sealing. The annular space and the flow guide opening groove 51 form a flow guide channel which leads the central channel 13 to be communicated up and down after the piston rod 5 is pushed to move upwards into the flow guide section 3, and the flow guide opening groove 51 forms a flow guide structure communicated with the annular space.
When the oil inlet preventing ball seat is used in practice, when a separate injection pipe column passes through an oil cap in the well descending process, the shear pin 7 is used for limiting and fixing the piston rod 5 in the cavity of the sealing section 4, the central channel 13 is completely plugged through the sealing ring 6, and the oil cap is prevented from entering the separate injection pipe column. When the lower part of the separate injection pipe column passes through the oil cap section, along with the increase of the internal and external pressure difference of the separate injection pipe column, the liquid pressure outside the separate injection pipe column is larger, upward top thrust is applied to the piston rod 5, when the top thrust reaches a certain value, the shear pin 7 is sheared under the action of the shearing force of the piston rod 5, the piston rod 5 is separated from the fixed limit between the piston rod 5 and the sealing section 4 at the moment, the piston rod 5 is pushed by the liquid pressure and enters the flow guide section 3, the sealing ring 6 moves upwards along with the piston rod 5 to the flow guide section, at the moment, the sealing ring 6 cannot form a seal due to the fact that the inner diameter of the flow guide section 3 is larger than the diameter of the piston rod 5, well liquid enters the separate injection pipe column through the sealing section 4, the annular space and the. After driving the tubular column to design degree of depth down, beat through oil pipe downwards, piston rod 5 is pressed and is moved down and fall into to the screen pipe in, driving tubular column bottom passageway this moment and open completely, later can just wash the well, test and seal the operation, wash well, test and seal the completion back just, through throwing into the spheroid from driving tubular column upper end, fall on ball seat section 2, realize the shutoff to injection tubular column bottom passageway, carry out the water injection operation after the allotment is qualified.
Of course, in other embodiments, the flow guide channel may be designed as follows: the inner diameter of the flow guide section is set to be consistent with that of the sealing section, meanwhile, a guide groove extending up and down is arranged on the side wall of the flow guide section, the upper end and the lower end of the guide groove are sealed, a guide hole is correspondingly arranged on the piston rod, the upper end of the guide hole is communicated with the inner cavity of the socket section, the other end of the guide hole is arranged on the side wall of the piston rod, the guide hole can be communicated with the guide groove after the piston rod moves into the flow guide section, the guide groove is communicated with the cavity of the sealing section, and a flow guide channel is formed through.
Of course, in other embodiments, the flow guiding structure may also be a flow guiding hole disposed on the piston rod; the stop may also be formed by a stop protrusion extending inwardly from the ball seat section; in other embodiments, the seal ring may be disposed on the inner sidewall of the seal segment, which also enables seal failure when the piston rod is moved up to disengage from sealing engagement with the seal ring; in other embodiments, the sealing failure can be ensured without a sealing ring, for example, the length of the piston rod is directly set to be smaller than that of the flow guide section, and the sealing failure can also be realized when the piston rod integrally enters the flow guide section.
The utility model relates to a separate injection tubular column's embodiment, separate injection tubular column include the tubular column body, and the lower extreme of tubular column body is connected with prevents the oil feed ball seat, and the structure that should prevent the oil feed ball seat is unanimous with the structure in the foretell embodiment of preventing the oil feed ball seat, no longer expandes in detail.
Claims (10)
1. The utility model provides a prevent oil feed ball seat, includes the tubulose pedestal that has central passage, its characterized in that: the tubular base body comprises a ball seat section for supporting a thrown ball body to seal the central passage, a flow guide section and a sealing section which are connected with the ball seat section and are sequentially arranged from top to bottom, the sealing section is internally provided with a piston rod for sealing and separating the central channel in a sealing and guiding way, a shearable shear pin is connected between the sealing section and the piston rod, the flow guide section is provided with an accommodating cavity for the piston rod to move upwards to enter so as to be separated from the sealing section and be in sealing fit after the shear pin is sheared by the piston rod under upward pressure, the tubular seat body is internally provided with a stopping part for stopping the piston rod upwards after the piston rod moves upwards and is separated from sealing fit with the sealing section, the piston rod moves upwards into the flow guide section under the action of pushing, a flow guide channel for communicating the central channel up and down is formed between the piston rod and the flow guide section, and the lower end of the tubular seat body is provided with an outlet for the piston rod to move downwards to leave the tubular seat body.
2. The oil-feeding prevention ball seat according to claim 1, characterized in that: the piston rod and the sealing section are in sealing fit through a sealing ring sleeved on the piston rod, and a sealing failure part which is arranged at an interval with the sealing ring to enable the sealing ring to fail is arranged in the accommodating cavity.
3. The oil-feeding prevention ball seat according to claim 2, characterized in that: the diameter of the piston rod is smaller than the inner diameter of the flow guide section, the sealing failure part is formed by an annular interval between the piston rod and the flow guide section, a flow guide structure which is communicated with the annular interval to conduct the central channel up and down when the piston rod moves upwards into the flow guide section by pushing is further arranged on the piston rod, and the annular interval and the flow guide structure form the flow guide channel.
4. The oil-feeding prevention ball seat according to claim 3, characterized in that: the flow guide structure is a flow guide open slot which is arranged on the upper end surface of the piston rod and extends along the radial direction of the piston rod in two directions.
5. The oil inlet prevention ball seat according to any one of claims 1 to 4, characterized in that: the ball seat section is of a necking structure with a wide upper part and a narrow lower part, the inner diameter of the lower end of the ball seat section is smaller than the diameter of the piston rod, and the blocking part is formed by the lower end face of the ball seat section.
6. divide tubular column of annotating, including the tubular column body, the lower extreme of tubular column body is connected with prevents the oil feed ball seat, the lower extreme of preventing the oil feed ball seat is connected with the screen pipe, prevent the oil feed ball seat including the tubulose pedestal that has central passage, its characterized in that: the dispensing pipe column is matched with a ball body which is used for being thrown into the oil inlet preventing ball seat, the tubular seat body comprises a ball seat section which is matched with the thrown ball body support to seal the central channel, and a flow guide section and a sealing section which are connected with the ball seat section and are sequentially arranged from top to bottom, the sealing section is internally provided with a piston rod for sealing and separating the central channel in a sealing and guiding way, a shearable shear pin is connected between the sealing section and the piston rod, the flow guide section is provided with an accommodating cavity for the piston rod to move upwards to enter so as to be separated from the sealing section and be in sealing fit after the shear pin is sheared by the piston rod under upward pressure, the tubular seat body is internally provided with a stopping part for stopping the piston rod upwards after the piston rod moves upwards and is separated from sealing fit with the sealing section, the piston rod moves upwards into the flow guide section under the action of pushing, a flow guide channel for communicating the central channel up and down is formed between the piston rod and the flow guide section, and the lower end of the tubular seat body is provided with an outlet for the piston rod to move downwards to leave the tubular seat body.
7. The dispensing string of claim 6, wherein: the piston rod and the sealing section are in sealing fit through a sealing ring sleeved on the piston rod, and a sealing failure part which is arranged at an interval with the sealing ring to enable the sealing ring to fail is arranged in the accommodating cavity.
8. The dispensing string of claim 7, wherein: the diameter of the piston rod is smaller than the inner diameter of the flow guide section, the sealing failure part is formed by an annular interval between the piston rod and the flow guide section, a flow guide structure which is communicated with the annular interval to conduct the central channel up and down when the piston rod moves upwards into the flow guide section by pushing is further arranged on the piston rod, and the annular interval and the flow guide structure form the flow guide channel.
9. The dispensing string of claim 8, wherein: the flow guide structure is a flow guide open slot which is arranged on the upper end surface of the piston rod and extends along the radial direction of the piston rod in two directions.
10. The dispensing column according to any one of claims 6 to 9, wherein: the ball seat section is of a necking structure with a wide upper part and a narrow lower part, the inner diameter of the lower end of the ball seat section is smaller than the diameter of the piston rod, and the blocking part is formed by the lower end face of the ball seat section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821587651.5U CN209742842U (en) | 2018-09-27 | 2018-09-27 | Injection pipe column and prevent oil feed ball seat thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821587651.5U CN209742842U (en) | 2018-09-27 | 2018-09-27 | Injection pipe column and prevent oil feed ball seat thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209742842U true CN209742842U (en) | 2019-12-06 |
Family
ID=68699791
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821587651.5U Active CN209742842U (en) | 2018-09-27 | 2018-09-27 | Injection pipe column and prevent oil feed ball seat thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209742842U (en) |
-
2018
- 2018-09-27 CN CN201821587651.5U patent/CN209742842U/en active Active
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