CN212803175U - Coal bed gas well production string - Google Patents
Coal bed gas well production string Download PDFInfo
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- CN212803175U CN212803175U CN202021475889.6U CN202021475889U CN212803175U CN 212803175 U CN212803175 U CN 212803175U CN 202021475889 U CN202021475889 U CN 202021475889U CN 212803175 U CN212803175 U CN 212803175U
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- annular space
- diaphragm pump
- bed gas
- oil pipe
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Abstract
The utility model discloses a coal bed gas well production tubular column, including diaphragm pump, oil pipe, nipple joint and center tube. A first annular space is formed between the casing and the oil pipe, and a second annular space is formed between the oil pipe and the central pipe. Two clapboards are arranged in the second annular space and used for separating the second annular space at the lower end of the circular arc sealing element into a small annular space and a large annular space. In the coal bed gas exploitation process, water in the first annulus, coal powder and coal bed gas enter the second annulus through the short section, meanwhile, water filled in the second annulus is sucked into a diaphragm cavity of the diaphragm pump through a first suction valve of the diaphragm pump through the small annulus, water in the large annulus is sucked into the diaphragm cavity of the diaphragm pump through the first suction valve of the diaphragm pump through the first annulus, coal powder and coal bed gas are sucked into the diaphragm cavity of the diaphragm pump through a second suction valve of the diaphragm pump, the water in the small annulus and the water in the large annulus are mixed, finally, the water is discharged into the central pipe through a discharge valve of the diaphragm pump, and finally, the water is discharged to the output pipe on the ground through the central pipe, so that the rodless.
Description
Technical Field
The utility model relates to a coal bed gas exploitation technical field, in particular to coal bed gas well production tubular column.
Background
In the coal bed gas mining process, a sucker rod pump is a common drainage and mining device. In the up-and-down movement process of the sucker rod, the sucker rod is contacted with the oil pipe, so that the sucker rod is rubbed with the oil pipe and even broken. The sucker rod can also generate eccentric wear with the inner wall of the oil pipe, and the eccentric wear between the sucker rod and the oil pipe can cause the sucker rod to break off from the oil pipe, thereby influencing the normal exploitation of the coal bed gas.
In recent years, the coal bed gas exploitation begins to adopt rodless pumps such as a hydraulic jet pump, an oil-submersible screw pump or a gas lift to carry out drainage exploitation so as to avoid the phenomenon that a sucker rod and an oil pipe break off due to eccentric wear of the sucker rod and the oil pipe. The rodless pump drainage and mining aiming at high-gas-yield coal bed gas becomes the research object of the technical personnel in the field.
Therefore, how to realize the rodless pump drainage and production of high-gas-yield coal bed gas becomes a technical problem to be solved urgently by the technical personnel in the field.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model provides a coal bed gas well production tubular column to realize the rodless pump row of high yield coal bed gas and adopt.
In order to achieve the above object, the utility model provides a following technical scheme:
a coal bed gas well production string comprising:
a diaphragm pump;
the oil pipe is positioned in a sleeve of the shaft, a first annular space is formed between the oil pipe and the sleeve, and the upper end of the oil pipe can be communicated with a drain pipe;
the upper end of the short section is connected with the lower end of the oil pipe, the lower end of the short section is connected with the diaphragm pump, and sieve holes for communicating the oil pipe with the first annulus are formed in the 1/2-3/4 circumference of the short section;
a central tube positioned in the oil tube, the upper end of the central tube is at least flush with the upper end of the oil tube and can be communicated with an output tube, the lower end of the central tube is communicated with a discharge valve of the diaphragm pump,
a second annular space is formed between the central pipe and the oil pipe, the second annular space can be filled with water,
the central pipe is arranged in the oil pipe through an annular mounting plate, the annular mounting plate is positioned at the upper end of the short section, an arc-shaped sealing element is arranged in the annular mounting plate, the arc-shaped sealing element is a 180-degree and 270-degree arc-shaped sealing element, the arc-shaped sealing element is positioned right above the position where the sieve pore is arranged on the short section,
two clapboards are arranged in the second annular space, the second annular space positioned at the lower end of the circular arc sealing element is separated into a small annular space and a large annular space along the axis direction of the second annular space, the small annular space is communicated with a first suction valve of the diaphragm pump, the large annular space is communicated with a second suction valve of the diaphragm pump, and the upper ends of the two clapboards are respectively connected with the end part of the circular arc sealing element and the lower end of the two clapboards is connected with the diaphragm pump.
Preferably, in the coal-bed gas well production string, the length of the short section is 1-2m, and the diameter of the sieve pore is 1-2 cm.
Preferably, in the coal-bed gas well production string, the outer wall of the short section is provided with a fine sand net.
Preferably, in the production string of the coal-bed gas well, the diameter of the central pipe is 30-40 mm.
According to the technical scheme, the utility model provides a coal bed gas well production tubular column, including diaphragm pump, oil pipe, nipple joint and center tube. The oil pipe and the central pipe are sleeved from outside to inside and connected, the oil pipe is located in a sleeve of the shaft, a first annular space is formed between the sleeve and the oil pipe, and a second annular space is formed between the oil pipe and the central pipe. Two clapboards are arranged in the second annular space and used for separating the second annular space at the lower end of the circular arc sealing element into a small annular space and a large annular space. In the coal bed gas exploitation process, water in the first annulus, coal powder and coal bed gas enter the second annulus through the short section, meanwhile, water filled in the second annulus is sucked into a diaphragm cavity of the diaphragm pump through a first suction valve of the diaphragm pump through the small annulus, water in the large annulus is sucked into the diaphragm cavity of the diaphragm pump through the first suction valve of the diaphragm pump through the first annulus, coal powder and coal bed gas are sucked into the diaphragm cavity of the diaphragm pump through a second suction valve of the diaphragm pump, the water in the small annulus and the water in the large annulus are mixed, finally, the water is discharged into the central pipe through a discharge valve of the diaphragm pump, and finally, the water is discharged to the output pipe on the ground through the central pipe, so that the rodless.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a coal bed gas well production string provided by an embodiment of the present invention;
FIG. 2 is a cross-sectional view A-A of FIG. 1;
fig. 3 is a cross-sectional view of B-B in fig. 1.
1. Diaphragm pump, 2, sleeve pipe, 3, oil pipe, 4, nipple joint, 5, center tube, 6, circular arc sealing member.
Detailed Description
The utility model discloses a coal bed gas well production string to the rodless pump row that realizes high yield coal bed gas adopts.
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Please refer to fig. 1-3. The utility model discloses a coal bed gas well production string, as shown in figure 1, including diaphragm pump 1, oil pipe 3, nipple joint 4 and center tube 5.
The oil pipe 3 and the central pipe 5 are sleeved from outside to inside and connected, the oil pipe 3 is positioned in the casing 2 of the shaft, a first annular space is formed between the casing 2 and the oil pipe 3, and a second annular space is formed between the oil pipe 3 and the central pipe 5.
The oil pipe 3 and the central pipe 5 are respectively formed by connecting a plurality of pipelines in turn through screw threads so as to adjust the lengths of the oil pipe 3 and the central pipe 5 according to the length of a shaft.
The upper end of the oil pipe can fill water into the second annular space, the lower end of the oil pipe is connected with the short section, and the lower end of the short section is connected with the diaphragm pump through screw threads. The sieve mesh has been seted up on nipple joint 4, and the sieve mesh can communicate oil pipe 3 and first annular space, and the sieve mesh can communicate first annular space and second annular space promptly, makes water, buggy and the coal bed gas in the first annular space pass through the sieve mesh and gets into the second annular space, and the second annular space communicates with the suction valve of diaphragm pump 1. The gas-liquid ratio of water, coal powder and coal bed gas sucked in the second annular space is high.
It should be noted here that the water filled in the second annular space is clean water.
Before the whole coal bed gas well production pipe column works, no liquid exists in the central pipe 5, and clean water needs to be filled in the second annular spaces of the central pipe 5 and the oil pipe 3.
The upper end of center tube 5 at least with oil pipe 3's upper end parallel and level and can with the output tube intercommunication on ground, the lower extreme of center tube 5 and the discharge valve intercommunication of diaphragm pump 1.
The central tube 5 is arranged in the oil tube 3 through an annular mounting plate, the annular mounting plate is positioned at the upper end of the short section 4, a circular arc-shaped sealing element 6 is arranged in the annular mounting plate, and an opening is formed in one side of the circular arc-shaped sealing element 6. The circular arc sealing piece 6 is a 180-degree and 270-degree circular arc sealing piece.
The 1/2-3/4 circumference of the short section 4 is provided with sieve holes, the position of the short section 4 provided with the sieve holes corresponds to the position of the circular arc-shaped sealing element 6, and the position of the short section 4 without the sieve holes corresponds to the opening position of the circular arc-shaped sealing element 6. Preferably, the radian of the circumference of the short section 4 provided with the sieve holes is equal to the radian of the circular arc-shaped sealing element 6.
The sealing element is a sealing element commonly used in the field of coal bed methane mining, and the specific selection of which sealing element is selected by a person skilled in the art according to actual needs is not specifically limited herein.
Two clapboards are arranged in the second annular space, the second annular space positioned at the lower end of the circular arc sealing element 6 is separated into a small annular space and a large annular space along the axis direction of the second annular space, the small annular space is communicated with the first suction valve of the diaphragm pump, the large annular space is communicated with the second suction valve of the diaphragm pump, and the upper ends of the two clapboards are respectively connected with the end part of the circular arc sealing element 6 and the lower end of the two clapboards is connected with the diaphragm pump.
In the coal bed gas exploitation process, water in the first annulus, coal powder and coal bed gas enter the second annulus through the nipple 4, meanwhile, water filled in the second annulus is sucked into a diaphragm cavity of the diaphragm pump 1 through a first suction valve of the diaphragm pump 1 through a small annulus, water entering a large annulus through the first annulus is sucked into a diaphragm cavity of the diaphragm pump 1 through a second suction valve of the diaphragm pump 1, the coal powder and the coal bed gas are sucked into the diaphragm cavity of the diaphragm pump 1 through the second suction valve of the diaphragm pump 1, the water in the small annulus and the water in the large annulus are mixed, the coal powder and the coal bed gas are finally discharged into the central tube 5 through a discharge valve of the diaphragm pump 1, and finally, the output tube is discharged to the ground through the central tube 5, so.
And conveying a mixture of water, coal powder and coal bed gas through an output pipe, and separating the mixture outside the well.
The coal bed gas well production string that this scheme is disclosed, the material that gets into diaphragm pump 1 is including filling the water of little annular space and getting into the water of big annular space through first annular space, buggy and coal bed gas, diaphragm pump 1 carries out the synchronous suction to above-mentioned material, the water yield that gets into diaphragm pump 1 through the suction valve has been increased, the hydroenergy that the little annular space got into diaphragm pump 1 enough compresses the coal bed gas that gets into diaphragm pump 1 through big annular space, reduce the water that gets into diaphragm pump 1 through big annular space, the gas-liquid ratio of buggy and coal bed gas, guarantee that the coal bed gas in diaphragm pump 1 can get into center tube 5 smoothly, avoid diaphragm pump 1 to take place the gas lock.
Water that gets into diaphragm pump 1 through little annular space in this scheme, for the water that has certain pressure, this pressure can be for the self pressure of the water column that is located the water formation of second annular space, if this pressure is not enough, can pour into the water that has certain pressure into to the second annular space through the ground to satisfy the pressure requirement of avoiding diaphragm pump 1 to produce the airlock.
The coal bed gas well production pipe column disclosed by the scheme can realize the rodless pump drainage and production of high-yield coal bed gas, and can avoid gas lock of the diaphragm pump 1, so that the smooth coal bed gas exploitation is ensured.
The coal bed gas well production pipe column is simple in structure, the operation of the diaphragm pump 1 is not influenced by gas and coal powder, gas, liquid and solid do not need to be separated underground, and the normal operation of a high-yield coal bed gas well with large gas-liquid ratio can be guaranteed.
As shown in fig. 2 and 3, in a specific embodiment of the present scheme, the circular arc seal 6 is a 270 ° circular arc seal 6, and the 3/4 circumference of the oil pipe 3 is provided with sieve holes.
The diaphragm pump 1 is capable of sucking water, pulverized coal and coal bed gas and discharging the sucked water, pulverized coal and coal bed gas into the center pipe 5. Specifically, when the diaphragm pump 1 sucks liquid, the discharge valve is closed, the first suction valve and the second suction valve of the diaphragm pump 1 are simultaneously opened, when the diaphragm pump 1 sucks liquid, the discharge valve is opened, and the first suction valve and the second suction valve of the diaphragm pump 1 are simultaneously closed.
This scheme has adjusted the position of nipple joint 4, has deepened the liquid inlet position of second annular space, is favorable to coal bed gas well's precipitation. In this scheme with the deeper of the position setting of nipple joint 4, nipple joint 4 is direct to be connected with 1 screw thread of diaphragm pump, the position of the nipple joint 4 of deepening of at utmost.
The length of the short section 4 is 1-2m, and in a specific embodiment of the scheme, the length of the short section 4 is 1.5 m.
The length of the short joint 4 is not limited to the length, and the liquid inlet capacity of the short joint 4 can be adjusted by increasing or shortening the length of the sieve tube according to the water yield.
In order to improve the filter effect to the buggy, this scheme is provided with the iron sand net at the outer wall of nipple joint 4. The pore size of the iron sand net is selected according to actual needs, and is not particularly limited herein.
In one embodiment of the present solution, the sealing member is a seal packing.
In another embodiment of the present solution, the sealing element is a rubber sealing element.
In a particular embodiment of the solution, the diameter of the central tube 5 is 30-40 mm. The diameter of the central pipe 5 is small, the flowing speed of well liquid in the central pipe 5 is high, and the coal dust can be better carried to the ground.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (4)
1. A coal bed gas well production string, comprising:
a diaphragm pump (1);
the oil pipe (3) is positioned in a casing (2) of a shaft, a first annular space is formed between the oil pipe (3) and the casing (2), and the upper end of the oil pipe (3) can be communicated with a drain pipe;
the upper end of the short section (4) is connected with the lower end of the oil pipe, the lower end of the short section (4) is connected with the diaphragm pump (1), and sieve holes for communicating the oil pipe (3) with the first annulus are formed in the 1/2-3/4 circumference of the short section (4);
the central pipe (5) is positioned in the oil pipe (3), the upper end of the central pipe (5) is at least flush with the upper end of the oil pipe (3) and can be communicated with an output pipe on the ground, the lower end of the central pipe (5) is communicated with a discharge valve of the diaphragm pump (1),
a second annulus is formed between the central pipe (5) and the oil pipe (3), the second annulus can be filled with water,
the central pipe (5) is arranged in the oil pipe (3) through an annular mounting plate, the annular mounting plate is positioned at the upper end of the short section (4), an arc-shaped sealing element (6) is arranged in the annular mounting plate, the arc-shaped sealing element (6) is a 180-degree 270-degree arc-shaped sealing element, the arc-shaped sealing element is positioned right above the position where the sieve holes are arranged on the short section (4),
two clapboards are arranged in the second annular space, the second annular space positioned at the lower end of the circular arc sealing piece (6) is separated into a small annular space and a large annular space along the axis direction of the second annular space, the small annular space is communicated with a first suction valve of the diaphragm pump, the large annular space is communicated with a second suction valve of the diaphragm pump, and the upper ends of the two clapboards are respectively connected with the end part of the circular arc sealing piece (6) and the lower end of the two clapboards is connected with the diaphragm pump.
2. Coal-bed gas well production string according to claim 1, characterized in that the nipple (4) has a length of 1-2 m.
3. Coal-bed gas well production string according to claim 1, characterized in that the outer wall of the nipple (4) is provided with a fine sand screen.
4. Coal-bed gas well production string according to claim 1, characterized in that the diameter of the central pipe (5) is 30-40 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021475889.6U CN212803175U (en) | 2020-07-23 | 2020-07-23 | Coal bed gas well production string |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021475889.6U CN212803175U (en) | 2020-07-23 | 2020-07-23 | Coal bed gas well production string |
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| CN212803175U true CN212803175U (en) | 2021-03-26 |
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| CN202021475889.6U Active CN212803175U (en) | 2020-07-23 | 2020-07-23 | Coal bed gas well production string |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115234214A (en) * | 2021-04-23 | 2022-10-25 | 中国石油天然气股份有限公司 | Filter equipment and arrange and adopt system |
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2020
- 2020-07-23 CN CN202021475889.6U patent/CN212803175U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115234214A (en) * | 2021-04-23 | 2022-10-25 | 中国石油天然气股份有限公司 | Filter equipment and arrange and adopt system |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CB03 | Change of inventor or designer information | ||
| CB03 | Change of inventor or designer information |
Inventor after: Qin Shaofeng Inventor after: Zhang Xiang Inventor after: Xue Zhiliang Inventor after: Zhao Ze Inventor after: Zhang Shouren Inventor after: Wang Jianzhong Inventor after: Zhang Sen Inventor after: Liu Jie Inventor after: Bean peak Inventor after: Li Qianshan Inventor after: Hu Qiuping Inventor after: He Siqi Inventor before: Qin Shaofeng Inventor before: Zhang Xiang Inventor before: Xue Zhiliang Inventor before: Zhao Ze Inventor before: Zhang Shouren Inventor before: Wang Jianzhong Inventor before: Zhang Sen Inventor before: Liu Jie Inventor before: Bean peak Inventor before: Li Qianshan Inventor before: Hu Qiuping Inventor before: He Siqi |
|
| CB03 | Change of inventor or designer information | ||
| CB03 | Change of inventor or designer information |
Inventor after: Qin Shaofeng Inventor after: Li Qianshan Inventor after: Hu Qiuping Inventor after: He Siqi Inventor after: Zhang Xiang Inventor after: Xue Zhiliang Inventor after: Zhao Ze Inventor after: Zhang Shouren Inventor after: Wang Jianzhong Inventor after: Liu Enqi Inventor after: Zhao Wei Inventor after: Yang Gang Inventor after: Zhang Sen Inventor after: Liu Jie Inventor after: Bean peak Inventor before: Qin Shaofeng Inventor before: Zhang Xiang Inventor before: Xue Zhiliang Inventor before: Zhao Ze Inventor before: Zhang Shouren Inventor before: Wang Jianzhong Inventor before: Zhang Sen Inventor before: Liu Jie Inventor before: Bean peak Inventor before: Li Qianshan Inventor before: Hu Qiuping Inventor before: He Siqi |