CN218844265U

CN218844265U - Coal bed gas U type horizontal well head management device

Info

Publication number: CN218844265U
Application number: CN202222233221.6U
Authority: CN
Inventors: 牛国斌; 郭庆; 马凯; 谭浩; 吴国强; 张铁军; 朱磊; 李刚; 唐红
Original assignee: Coal Geology Bureau Of Ningxia Hui Autonomous Region
Current assignee: Coal Geology Bureau Of Ningxia Hui Autonomous Region
Priority date: 2022-08-24
Filing date: 2022-08-24
Publication date: 2023-04-11
Anticipated expiration: 2032-08-24

Abstract

The utility model belongs to the invention relates to coal bed gas exploitation field, concretely relates to coal bed gas U type horizontal well head management device. The pressure relief type well head comprises a well head sleeve, a sieve pipe, a ball valve, a pressure relief exhaust guide pipe and a pressure gauge and further comprises an annular fixed tray, wherein the fixed tray is used for connecting the sieve pipe and the sleeve, the inlet end of the ball valve is connected with the well head sleeve in a sealing mode, the outlet end of the ball valve is connected with the pressure relief exhaust guide pipe, a bypass pipe is arranged at the inlet end of the ball valve, and the bypass pipe is connected with the pressure gauge. The fixing of the through-the-air sieve tube used for production in the U-shaped horizontal well is realized, the well accidents of tube running or sliding are avoided, the stable distribution of the continuous sieve tube in the whole horizontal well is ensured, and safe and reliable conditions are provided for secondary or repeated operation in the well in the later period.

Description

Coal bed gas U type horizontal well head management device

Technical Field

The utility model belongs to the invention relates to coal bed gas exploitation field, concretely relates to coal bed gas U type horizontal well head management device.

Background

A large amount of coal bed gas exploration and development work is carried out in China at present, aiming at the geological characteristics of low permeability, low pressure, low saturation, structural coal development, strong heterogeneity and the like of coal bed gas reservoirs in China, the long-distance U-shaped horizontal well and L-shaped horizontal well have very high production benefits which are 5-10 times of the yield and benefits of a conventional straight well, but the process is complex, and the technical difficulty is high. At present, the completion mode of the long-distance horizontal well is mainly three, one mode is open hole completion, namely, the well is directly completed without casing or sieve tube after the target horizon and the well depth are drilled; the other is well cementation and completion after casing, namely after the target position and the well depth are drilled, the petroleum casing is put in and then cement is injected to seal the casing; and the third is that the screen pipe is put in and then the well is completed without cementing, namely, after the target layer and the well depth are drilled, the screen pipe made of steel or resin fiber is put in and is not sealed by cement, and the screen pipe is in a movable state in the well. In the third horizontal well completion mode, in order to prevent the movable sieve tube in the well from running or sliding, the sieve tube needs to be fixed in the well, the traditional method is to insert the sieve tube into the technical sleeve with the diameter of 177.8mm at a certain depth position to connect with the hanger, but the method is not favorable for secondary operation in the horizontal well at the later stage (an operation drilling tool enters the well through the sieve tube), and the operation drilling tool is easy to scrape or block at the position of the sieve tube hanger, so that an accident in the well is caused.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem, the utility model discloses in need fix the screen pipe end in ground well head position, realize whole journey unblocked (go into the sky screen pipe promptly) in the horizontal well, at this moment just need install an annular steel sheet fixed tray at the screen pipe end additional, sit this tray and seal on the technical casing head (inlayer sleeve pipe) of ground well head, guaranteed promptly that the screen pipe does not take place to run the pipe or slide, unblocked in the well when having guaranteed later stage secondary operation in the horizontal well again. Because during the operation is adopted to the horizontal well of U type, will take sealed management with engineering well (horizontal well) well head, prevent pressure release and gas leakage during production, traditional way is overhead at technical casing (inlayer sleeve pipe) installs a screw thread blind plate additional and seals up whole well head, nevertheless to the well head of having gone into the sky screen pipe down, because of the hindrance of well head annular steel sheet fixed tray, can't install the screw thread blind plate and carry out the shutoff. Therefore, after the sieve tube in the horizontal well is suspended and fixed by the annular steel plate tray, the ball valve is connected to the surface casing, the whole engineering well (horizontal well) wellhead is wrapped and sealed, safe gas production operation is realized, and if secondary operation needs to be carried out in the well in the later period, the ball valve is opened to release pressure, and then the ball valve is detached.

The utility model provides a coal bed gas U type horizontal well head management device, includes well head sleeve pipe, screen pipe, ball valve, pressure release exhaust pipe and manometer, still includes annular fixed tray, and fixed tray is used for connecting screen pipe and sleeve pipe, the entrance point and the well head sleeve pipe sealing connection of ball valve, and the exit end is connected with pressure release exhaust pipe, and the entrance point of ball valve sets up the bypass pipe, and the manometer is connected to the bypass pipe.

Furthermore, the sleeve comprises a surface layer sleeve and an inner layer sleeve which are coaxially arranged, and a cement filling layer is arranged between the surface layer sleeve and the inner layer sleeve.

Furthermore, the sieve tube is arranged in the inner layer sleeve, and the top end of the inner layer sleeve is connected with the top end of the sieve tube through the fixed tray.

Furthermore, a well head flange plate is arranged at the top end of the surface casing pipe, and an inlet end flange plate of the ball valve is connected with the well head flange plate through bolts.

And further, a sealing ring is arranged between the wellhead flange plate and the inlet end flange plate.

Furthermore, a bypass flange plate is arranged at the outer end of the bypass pipe and used for connecting a pressure gauge.

Furthermore, an outlet end flange plate is arranged at the outlet end of the ball valve and is used for connecting a pressure relief exhaust conduit.

The utility model has the advantages that: (1) The fixing of the through-the-air sieve tube used for production in the U-shaped horizontal well is realized, and the well accidents of tube running or sliding are avoided;

(2) The through-the-sky sieve tube is fixed on a well head in an annular tray mode, so that stable distribution of continuous sieve tubes in the whole horizontal well is ensured, and safe and reliable conditions are provided for secondary or repeated operation in the well at a later stage;

(3) Install a controllable ball valve that has the gas pressure observation table additional on whole well head upper portion, it is sealed with whole well head parcel, the possibility that takes place well head pressure release gas leakage when effectively having avoided later stage drainage gas production, guaranteed that liquid level and pressure stability in the U type horizontal well during gas production descend, reduced because of the injury of horizontal well head pressure release gas leakage to the coal reservoir. If the pressure relief and air leakage occur due to improper wellhead management during gas production of the U-shaped horizontal well, engineering and economic losses are brought to repeated wellhead maintenance, the repeated surging of the liquid level and the reservoir pressure in the well can be caused, the reservoir is greatly damaged, the service life of the U-shaped well is shortened, and the yield of a single well is greatly reduced.

(4) After the detachable ball valve with the pressure gauge is installed at the wellhead of the horizontal well, the aeration pressure gauge can observe the casing pressure change condition of the coal bed gas in the horizontal well, a scientific basis is provided for the selection of the mining intensity and the discharge frequency parameters of the whole U-shaped horizontal well, and a solid foundation is laid for the research of the desorption, diffusion and migration rules of the whole regional coal bed gas.

(5) The comprehensive application of the device can greatly improve the continuous drainage production of the U-shaped horizontal well with the through-flow screen pipe in the well, and provides indispensable conditions for the high yield and safe production of the U-shaped horizontal well.

Drawings

Fig. 1 is a schematic front view of the present invention;

fig. 2 is a schematic perspective view of an embodiment of the present invention;

FIG. 3 is a schematic cross-sectional view of an embodiment of the present invention;

fig. 4 is a perspective view of fig. 3.

In the figure: 1. a surface casing; 2. an inner casing; 3. a cement filling layer; 4. a screen pipe; 5. fixing the tray; 6. a well head flange plate; 7. a bypass flange plate; 8. a pressure gauge; 9. a pressure relief exhaust conduit; 10. a ball valve.

Detailed Description

As shown in fig. 1-4: the utility model provides a coal bed gas U type horizontal well head management device, the well head that is located ground department sets up top layer sleeve pipe 1 and inlayer sleeve pipe 2, pack cement between top layer sleeve pipe 1 and the inlayer sleeve pipe 2 as cement filling layer 3, be U type well passageway in the inlayer sleeve pipe 2, set up screen pipe 4 in the passageway, annular fixed tray 5 and inlayer sleeve pipe 2 fixed connection are passed through to the top of screen pipe 4, well head ring flange 6 is connected on top layer sleeve pipe 1 top, the entrance point ring flange and the well head ring flange 6 of ball valve 10 pass through bolted connection, set up the sealing washer between well head ring flange 6 and the entrance point ring flange. The inlet end of the ball valve 10 is provided with a bypass pipe, the outer end of the bypass pipe is provided with a bypass flange 7, and the bypass flange 7 is connected with a pressure gauge 8. An outlet end flange is arranged at the outlet end of the ball valve 10 and is used for connecting a pressure relief exhaust duct 9.

The utility model discloses a main points are with mobilizable 4 ends of glass steel screen pipe installs an annular steel sheet tray additional in the horizontal well and sits to seal and fix at the well head, whole unblocked in the horizontal well has been realized, install a ball valve 10 of taking the gas pressure observation table additional on well head upper portion simultaneously, wrap up whole well head, realized well head safe controllable sealed, the well head takes place the pressure release gas leakage during preventing drainage step-down, also can realize the secondary operation in the later stage horizontal well, the safe high-efficient operation requirement of U type horizontal well has been satisfied.

Claims

1. The utility model provides a coal bed gas U type horizontal well head management device, includes well head sleeve pipe, screen pipe (4), ball valve (10), pressure release exhaust pipe (9) and manometer (8), its characterized in that still includes annular fixed tray (5), fixed tray (5) are used for connecting screen pipe (4) with the sleeve pipe, the entrance point of ball valve (10) with well head sleeve pipe sealing connection, the exit end with pressure release exhaust pipe (9) are connected, the entrance point of ball valve (10) sets up the bypass pipe, manometer (8) are connected to the bypass pipe.

2. The wellhead management device for the U-shaped horizontal wells for coal bed methane according to claim 1, characterized in that the casing pipes comprise a surface casing pipe (1) and an inner casing pipe (2) which are coaxially arranged, and a cement filling layer (3) is arranged between the surface casing pipe (1) and the inner casing pipe (2).

3. The wellhead management device for the U-shaped horizontal coal bed methane well is characterized in that the screen pipe (4) is arranged in the inner casing pipe (2), and the top end of the inner casing pipe (2) is connected with the top end of the screen pipe (4) through the fixed tray (5).

4. The wellhead management device for the U-shaped horizontal wells for the coal bed methane according to claim 2, characterized in that a wellhead flange (6) is arranged at the top end of the surface casing (1), and an inlet end flange of the ball valve (10) is connected with the wellhead flange (6) through bolts.

5. The device for managing the wellhead of the U-shaped horizontal well for coal bed gas according to claim 4, characterized in that a sealing ring is arranged between the wellhead flange plate (6) and the inlet end flange plate.

6. The device for managing the wellhead of the U-shaped horizontal well for coal bed methane according to any one of claims 1 to 5, characterized in that a bypass flange (7) is arranged at the outer end of the by-pass pipe, and the bypass flange (7) is used for connecting the pressure gauge (8).

7. The wellhead management device for the U-shaped horizontal wells for the coal bed methane according to claim 6, characterized in that an outlet end flange is arranged at an outlet end of the ball valve (10), and the outlet end flange is used for being connected with the pressure relief exhaust conduit (9).