CN212689991U

CN212689991U - Stable control gas flow system of two-stage throttle valve of coal-bed gas well

Info

Publication number: CN212689991U
Application number: CN202021487767.9U
Authority: CN
Inventors: 胡海洋; 姜秉仁; 陈捷; 朱家伟; 陶斤金
Original assignee: GUIZHOU PROVINCE CBM SHALE GAS ENGINEERING TECHNOLOGY RESEARCH CENTER
Current assignee: GUIZHOU PROVINCE CBM SHALE GAS ENGINEERING TECHNOLOGY RESEARCH CENTER
Priority date: 2020-07-24
Filing date: 2020-07-24
Publication date: 2021-03-12
Anticipated expiration: 2030-07-24

Abstract

The utility model discloses a coal bed gas well two-stage throttle valve stable control gas flow system, which comprises a gas production well mouth and a sleeve, wherein the bottom end of the gas production well mouth is penetrated and connected with the sleeve at a vertical position, the periphery of the sleeve is provided with a double-male sleeve below the gas production well mouth, the double-male sleeve is separated and connected at the sleeve, the inner side of the sleeve is penetrated and inserted with an oil pipe at the vertical position, the top end of the oil pipe is penetrated and connected at the gas production well mouth, the inner side of the oil pipe is inserted with a sucker rod at the vertical position, the upper part of the sucker rod is penetrated and connected with a water production tee at the top end of the gas production well mouth, the top end of the water production tee is connected with a packing box, the sucker rod is vertically penetrated and connected into the water production tee packing box and the box, and the air pressure in an annular space between, thereby avoiding the potential safety hazard problem of the well body caused by air pressure floating.

Description

Stable control gas flow system of two-stage throttle valve of coal-bed gas well

Technical Field

The utility model belongs to the technical field of coal bed gas is handled relatively, concretely relates to coal bed gas well two-stage choke valve stable control air flow system.

Background

The coal mining depth is increased year by year, the gas content and the gas pressure of a coal seam are gradually increased, the gas control cost and difficulty are increased, gas extraction is required before coal mining, the gas content of the coal seam is reduced, the gas content of a coal mining working face of a coal mine can be controlled in advance through ground coal seam gas development, and the underground coal mining risk is reduced.

The prior art of controlling the air flow system has the following problems: in the process of developing the coal bed gas on the ground of the deep coal bed, because the reservoir pressure and the critical desorption pressure are higher, the casing pressure rises faster at the initial stage of desorption of the coal bed, but the actual desorption gas quantity of the coal bed is less, the desorption speed of the coal bed is slower, and in the process of releasing casing pressure to produce gas, because the gas production is unstable, the mode of singly adopting a needle valve to control the casing pressure and stabilize the gas production is not beneficial to stabilizing the casing pressure of a shaft, when the casing pressure of the shaft fluctuates, the discharge and production control of the coal bed is not beneficial, measures need to be taken to ensure the stability of the casing pressure of the shaft, and the stability of the bottom flow pressure of the coal bed gas well is ensured, so that.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a coal bed gas well two-stage choke valve stable control gas flow system, in order to solve and to propose the deep ground coal seam in the ground coal seam gas development process among the above-mentioned background art, because reservoir pressure, critical desorption pressure is higher, at the coal seam desorption initial stage, the casing pressure rises very fast, but the actual desorption gas volume in coal seam is less, coal seam desorption speed is slower, at the in-process of putting casing pressure gas production, because the gas production is unstable, the single mode of taking the needle valve of needle type valve is controlled the casing pressure and is stabilized the mode of producing gas and be unfavorable for stabilizing the shaft casing pressure, when the shaft casing pressure can fluctuate, be unfavorable for the row of coal bed gas well to adopt the control, need take the measure and guarantee the stability of shaft casing pressure, ensure the stability of coal bed gas well bottom flowing pressure, be.

In order to achieve the above object, the utility model provides a following technical scheme:

the coal bed gas well two-stage throttling valve stable control gas flow system comprises a gas production well mouth and a sleeve, wherein the bottom end of the gas production well mouth is provided with the sleeve in a penetrating manner at a vertical position, the periphery of the sleeve is provided with a double-male sleeve below the gas production well mouth, the double-male sleeve is separated and connected at the sleeve, the inner side of the sleeve is provided with an oil pipe in a penetrating manner at the vertical position, the top end of the oil pipe is connected at the gas production well mouth in a penetrating manner, the inner side of the oil pipe is inserted with an oil pumping rod at the vertical position, the top end of the oil pumping rod at the gas production well mouth is connected with a water production tee in a penetrating manner, the top end of the water production tee is connected with a packing box in a penetrating manner, the oil pumping rod is vertically inserted into the water production tee and the packing box in a penetrating manner, the right end of the water production tee is connected with a throttling valve in a penetrating manner, the right end port, the left side of needle valve front end clamp formula gate valve is being connected with the needle valve lieing in pipeline port department, the left end port department of needle valve pegs graft and is provided with the gas flow, the right side of gas production well head is being connected with cock front end clamp formula gate valve lieing in pipeline port department, cock front end clamp formula gate valve's right side is being connected with the cock lieing in pipeline port department.

Preferably, the oil pipe is arranged as a water passage, and an annular space formed between the oil pipe and the casing pipe is arranged as a gas passage.

Preferably, the needle valve and the clamp gate valve at the front end of the needle valve can control the gas flow speed in the interlayer at the oil pipe and the casing.

Preferably, be provided with the packing in the packing box, the sucker rod alternates from the packing department that sets up in the packing box and removes.

Preferably, the water produced in the oil pipe can be discharged from the water flow path.

Preferably, the cock can be provided with a pressure test meter, and the pressure test meter at the cock can test the gas pressure value in the annular space at the oil pipe and the casing pipe.

Preferably, the sucker rod can move up and down relative to the oil pipe under the action of force, and water liquid in the oil pipe can be discharged from a water flow path when the sucker rod moves up and down.

Compared with the prior art, the utility model provides a coal seam gas well two-stage choke valve stable control air flow system possesses following beneficial effect:

1. the utility model discloses utilize two-stage choke valve integrated control's advantage, realize that coal bed gas well ground produces gas stably, the purpose that the pit shaft casing pressure is stable, can avoid the pressure oscillation to lead to the influence that coal bed gas well row adopted control, and control through the two-stage choke valve, guarantee that the atmospheric pressure in the annular space is stable between oil pipe and the sleeve pipe, and then avoid floating because of the atmospheric pressure, and the well body potential safety hazard problem that leads to.

2. The utility model discloses a stable control atmospheric pressure is favorable to the stable row of coal bed gas well to adopt the control, avoids the atmospheric pressure unstability in the annular space between oil pipe and the sleeve pipe, to the influence of coal bed gas well row exploitation control, can reduce the injury of atmospheric pressure unstability to coal reservoir permeability.

Drawings

The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention, and together with the description, do not constitute a limitation of the invention, in which:

fig. 1 is a schematic view of the overall structure of a two-stage throttle valve stable control gas flow system of a coal-bed gas well according to the present invention;

fig. 2 is a schematic view of a cross-sectional structure of a gas well end in a two-stage throttle valve stable control gas flow system of a coal-bed gas well according to the present invention;

in the figure: 1. gas flow; 2. a needle valve; 3. a clamp type gate valve at the front end of the needle valve; 4. a gas production wellhead; 5. a water producing tee joint; 6. a sucker rod; 7. a packing box; 8. a throttle valve; 9. water flow; 10. a cock front end clamp type gate valve; 11. cock; 12. the sleeve is double; 13. a sleeve; 14. and (4) an oil pipe.

Detailed Description

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.

Referring to fig. 1-2, the utility model provides a coal bed gas well two-stage choke valve stable control gas flow system technical scheme:

coal bed gas well two-stage choke valve stable control gas flow system, including gas production well head 4 and sleeve pipe 13, the bottom of gas production well head 4 is being located vertical position department through connection and is having sleeve pipe 13, the periphery of sleeve pipe 13 is provided with the public 12 of sleeve pipe in the below that is located gas production well head 4, the public 12 wall of sleeve pipe is connected in sleeve pipe 13 department, oil pipe 14 has been alternate to the inboard of sleeve pipe 13 being located vertical position department, oil pipe 14 is the setting of water liquid passageway, the annular space that forms between oil pipe 14 and the sleeve pipe 13 is the setting of gas passageway, the top through connection of oil pipe 14 is in gas production well head 4 department, oil pipe 14's inboard is being located vertical position department and is pegged graft and is had sucker rod 6, sucker rod 6 can reciprocate relative to oil pipe 14 under the effect of power, water liquid can be discharged from water.

Coal bed gas well two-stage choke valve stable control gas flow system, including the top of sucker rod 6 run through the bolt and have produced water tee bend 5 on the top that is located gas production well head 4, produce the top bolt of water tee bend 5 and have packing box 7, in sucker rod 6 vertical interlude to producing water tee bend 5 and packing box 7, the right-hand member bolt of producing water tee bend 5 has choke valve 8, and the grafting of the right-hand member port department of choke valve 8 is provided with water flow 9.

The system comprises a needle valve front end clamp type gate valve 3 connected to the left side of a gas production wellhead 4 at the position of a pipeline port, a needle valve 2 connected to the left side of the needle valve front end clamp type gate valve 3 at the position of the pipeline port, the needle valve 2 and the needle valve front end clamp type gate valve 3 can control the gas flow speed in an interlayer of an oil pipe 14 and a sleeve 13, a gas flow 1 is arranged at the left end port of the needle valve 2 in an inserting mode, a cock front end clamp type gate valve 10 is connected to the right side of the gas production wellhead 4 at the position of the pipeline port, a cock 11 is connected to the right side of the cock front end clamp type gate valve 10 at the position of the pipeline port, a pressure test meter can be installed at the cock 11, and the pressure test meter at the cock 11 can test the gas pressure value in the annular space of the oil pipe 14 and the sleeve 13.

The utility model discloses a theory of operation and use flow: the utility model discloses install the back, the effort is in sucker rod 6 department, reciprocate for oil pipe 14 through sucker rod 6, and then under choke valve 8 is in the valve port open mode, come to discharge water liquid from water procedure 9 in the oil pipe 14, and produced gas in sleeve pipe 13 and the oil pipe 14 annular space, then via gas production well head 4 departments, the management and control passageway that needle valve front end clamp formula gate valve 3 and needle valve 2 formed, discharge from air procedure 1 department, the discharge in-process, through the aperture of adjusting needle valve front end clamp formula gate valve 3, the tolerance size of coming out in the annular space between oil pipe 14 and the sleeve pipe 13 is followed in the control, through needle valve 2, the size of air flow 1 is gone into in the further control, finally realize the purpose of the stable control gas flow.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. Coal bed gas well two-stage choke valve stable control gas flow system, including producing gas well head (4) and sleeve pipe (13), its characterized in that: the bottom end of the gas production wellhead (4) is in penetrating connection with a sleeve (13) at a vertical position, a double male sleeve (12) is arranged on the periphery of the sleeve (13) below the gas production wellhead (4), the double male sleeve (12) is connected to the sleeve (13) in a blocking manner, an oil pipe (14) penetrates and is inserted into the inner side of the sleeve (13) at the vertical position, the top end of the oil pipe (14) penetrates and is connected to the gas production wellhead (4), a sucker rod (6) is inserted and connected into the inner side of the oil pipe (14) at the vertical position, a water production tee (5) penetrates and is bolted onto the top end of the gas production wellhead (4) above the sucker rod (6), a packing box (7) is bolted onto the top end of the water production tee (5), the sucker rod (6) vertically penetrates and is inserted into the water production tee (5) and the packing box (7), and a throttle valve (8) is bolted onto the right end of the water production tee (5), the grafting of right-hand member port department of choke valve (8) is provided with water flow (9), the left side of adopting gas well head (4) is being located pipeline port department and is being connected with needle valve front end clamp formula gate valve (3), the left side of needle valve front end clamp formula gate valve (3) is being located pipeline port department and is being connected with needle valve (2), the left end port department grafting of needle valve (2) is provided with gas flow (1), the right side of adopting gas well head (4) is being located pipeline port department and is being connected with cock front end clamp formula gate valve (10), the right side of cock front end clamp formula gate valve (10) is being located pipeline port department and is being connected with cock (11).

2. The system for stably controlling the gas flow rate of the two-stage throttling valve of the coal-bed gas well as the method for stably controlling the gas flow rate of the two-stage throttling valve of the coal-bed gas well as the gas flow: the oil pipe (14) is arranged for a water channel, and an annular space formed between the oil pipe (14) and the sleeve (13) is arranged for a gas channel.

3. The system for stably controlling the gas flow rate of the two-stage throttling valve of the coal-bed gas well as the method for stably controlling the gas flow rate of the two-stage throttling valve of the coal-bed gas well as the gas flow: the needle valve (2) and the clamp type gate valve (3) at the front end of the needle valve can control the gas flow speed in the interlayer at the oil pipe (14) and the sleeve (13).

4. The system for stably controlling the gas flow rate of the two-stage throttling valve of the coal-bed gas well as the method for stably controlling the gas flow rate of the two-stage throttling valve of the coal-bed gas well as the gas flow: the packing is arranged in the packing box (7), and the sucker rod (6) is inserted and moved from the packing arranged in the packing box (7).

5. The system for stably controlling the gas flow rate of the two-stage throttling valve of the coal-bed gas well as the method for stably controlling the gas flow rate of the two-stage throttling valve of the coal-bed gas well as the gas flow: the water produced in the oil pipe (14) can be discharged from the water flow path (9).

6. The system for stably controlling the gas flow rate of the two-stage throttling valve of the coal-bed gas well as the method for stably controlling the gas flow rate of the two-stage throttling valve of the coal-bed gas well as the gas flow: the pressure test meter can be installed at the cock (11), and the pressure test meter at the cock (11) can test the gas pressure value in the annular space at the oil pipe (14) and the sleeve (13).

7. The system for stably controlling the gas flow rate of the two-stage throttling valve of the coal-bed gas well as the method for stably controlling the gas flow rate of the two-stage throttling valve of the coal-bed gas well as the gas flow: the sucker rod (6) can move up and down relative to the oil pipe (14) under the action of force, and water liquid in the oil pipe (14) can be discharged from the water flow path (9) when the sucker rod (6) moves up and down.