CN201705266U - Coalbed gas wellhead device for exhausting coal water and gas and injecting water - Google Patents

Abstract

The utility model is a coal bed gas well discharge coal water injection water injection exhaust wellhead device, which is composed of an upper body A, a coal water separation device 2, a large elbow 4, a coal discharge water valve 5, a middle flange 6, a drainage valve 11, a large method Lan 15, casing flange 16, water injection pipe 17, water injection valve 18, four-way 19, one-way valve 20, small flange 21, air outlet pipe 23, filter 24, small elbow 25, air outlet valve 26, bolt 28 The upper body A is tightly connected with the casing flange 16 through bolts 28, and the coal water discharge valve 5, the coal water separation device 2 and the one-way valve 20 respectively pass through the middle flange 6, the large flange 15, the small flange 21 and the The upper body A is tightly connected, the head and tail of the big elbow 4 are respectively connected with the coal discharge valve 5 and the mixture inlet 3, the bottom end of the four-way 19 is fixedly connected with the one-way valve 20, and the left end of the four-way 19 is installed with a The drain valve 11 connected to the drain port 12, the upper end of the small elbow 25 is equipped with a filter 24, and the lower end is installed together with the outlet valve 26; the upper body A is provided with three independent pipelines, which are respectively the coal discharge pipeline 7 and the injection pipeline 7. Water pipeline 22 and outlet pipeline 27. The utility model has a simple and compact structure, and is easy to install. During the coalbed methane mining operation, coal discharge, water injection and exhaust are integrated.

Description

A coalbed methane well discharge coal water injection water exhaust wellhead device

technical field

The utility model relates to a wellhead device of a coalbed gas well, in particular to a wellhead device capable of discharging coal water, exhausting gas and injecting water for coalbed gas exploitation. the

Background technique

Wellhead device is an important equipment to ensure the normal production of coalbed methane wells. At present, there are many types of coalbed methane wellhead devices with different structures, but they can be divided into two types according to their uses: fracturing wellhead devices and coalbed methane mining wellhead devices. The wellhead devices used in coalbed methane production only have a single Water injection or exhaust function. When carrying out on-site drainage and gas extraction operations, deep well drainage equipment is generally used to discharge the coal-water mixture in the coalbed methane well to the ground through the conduit and enter the separator. After production, the replacement from the water injection function to the exhaust function and drainage function requires repeated disassembly and installation of the equipment, which brings inconvenience to the construction and increases the labor intensity of the workers. the

Utility model content

In order to solve the deficiencies of the existing technology, the purpose of this utility model is to provide a wellhead device for discharging coal water, injecting water, and exhausting coalbed methane wells. , and the water separated by the coal-water separation device can be recycled. The utility model has a simple and compact structure and is easy to install. the

The purpose of this utility model can be realized by following technical measures:

The utility model is a coal bed gas well discharge coal water injection water injection exhaust wellhead device, which consists of an upper body, a coal water separation device, a large elbow, a coal discharge water valve, a middle flange, a drain valve, a large flange, a casing flange, Water injection pipe, water injection valve, four-way, one-way valve, small flange, air outlet pipe, filter, small elbow, air outlet valve, and bolts; The flange, the middle flange, the small flange, and the gas outlet valve are fixed on the upper body, the coal-water separation device and the coal-water discharge valve are fixedly installed with the large flange and the middle flange respectively, and the coal-water water valve, the coal-water separation device and the The one-way valve is tightly connected to the upper body through the middle flange, the large flange and the small flange respectively. The head and tail of the large elbow are respectively connected with the coal discharge valve and the mixture inlet of the coal-water separation device. The upper end of the small flange is fixedly installed. There is a one-way valve, the bottom end of the four-way is fixedly connected with the one-way valve, the left end of the four-way is installed with a drain valve connected to the drain port, and the other ends of the four-way are installed with a drain valve connected with the water injection pipe. The lower end of the small elbow is installed together with the air outlet valve, and the upper end of the small elbow is installed with a filter fixedly connected to the air outlet pipe; there are three independent pipes in the upper body, which are respectively the coal discharge water pipe, the water injection pipe and the air outlet pipe The water injection pipeline carries out water injection to flush the coal body, the gas outlet pipeline discharges the coalbed methane leaking from the underground, and the coal water discharge pipeline discharges the underground coal-water mixture; the pressure gauge on the coal-water separation device can record and display the coal-water separation device. Pressure parameters; the one-way valve can avoid the medium (water, gas) reverse flow phenomenon caused by the pressure rise in the well; after the connection and fastening of various components, the functions of water injection and gas outlet are realized by water injection and control of the gas outlet valve. The mixture is discharged to the coal-water separation device through the conduit, and the separated coalbed methane and coal particles are discharged through the exhaust port and the sewage discharge port, and the separated water can be injected into the well for recycling. the

Description of drawings

Fig. 1 is the overall structural representation of the utility model;

The marks in the figure are: A: upper body; 1: pressure gauge; 2: coal-water separation device; 3: mixture inlet; 4: large elbow; 5: coal discharge water valve; 6: middle flange; 7: coal discharge Water pipeline; 8: conduit; 9: exhaust valve; 10: exhaust port; 11: drain valve; 12: drain port; 13: drain valve; 14: drain port; 15: large flange; 16: casing flange ;17: Water injection pipe; 18: Water injection valve; 19: Four-way; 20: Check valve; 21: Small flange; 22: Water injection pipe; 23: Air outlet pipe; 24: Filter; 25: Small elbow; 26: Air outlet valve; 27: Air outlet pipeline; 28: Bolt. the

Detailed ways

Below in conjunction with accompanying drawing, specific introduction is as follows to the embodiment of the present utility model:

First of all, as shown in Figure 1, when assembling a coal bed gas well discharge coal water injection water injection exhaust wellhead device of the utility model, the casing flange 16 and the upper body A should be fastened with bolts 28 first, and then the large flange 15, The middle flange 6, the small flange 21, and the gas outlet valve 26 are fixed on the upper body A, and the coal-water separation device 2 and the coal discharge water valve 5 are respectively fixedly installed together with the large flange 15 and the middle flange 6, and then the large The head and tail of the elbow 4 are respectively connected with the coal water valve 5 and the mixture inlet 3 of the coal water separation device 2, and sealed. In addition, a check valve 20 is fixedly installed on the upper end of the small flange 21, and the four-way 19 The bottom end is fixedly connected with the one-way valve 20, the left end of the four-way 19 is equipped with a drain valve 11 connected to the drain port 12, and the remaining ends of the four-way 19 are equipped with a drain valve 18 connected with the water injection pipeline 17, and then , the lower end of the small elbow 25 and the air outlet valve 26 are installed together, the upper end of the small elbow 25 is equipped with a filter 24 fixedly connected with the air outlet pipeline 23, and finally check the surrounding space to prevent leakage; the upper body A is provided with three Two independent pipelines are respectively coal discharge pipeline 7, water injection pipeline 22 and gas outlet pipeline 27. The water injection pipeline 22 carries out water injection to flush the coal body, the gas outlet pipeline 27 discharges the coalbed methane permeating underground, and the coal discharge pipeline 7 Drain the underground coal-water mixture; the pressure gauge 1 on the coal-water separation device 2 can record and display the pressure parameters in the coal-water separation device 2; the check valve 20 can control the water injection to prevent the medium (water, gas) caused by the pressure rise in the well. ) countercurrent phenomenon, to avoid accidents such as explosions; the filter 24 connected to the gas outlet pipeline 23 can filter out solid impurities such as coal dust in the coalbed methane, and also has the function of drying the gas. When the gas outlet valve 26 is closed, the filter 24 is removed Easy to change. the

When the assembled CBM well discharge coal water injection water injection exhaust wellhead device is in operation, the water injection valve 18 is first opened, and water is continuously injected into the water injection pipeline 17, and the water enters the underground through the water injection pipeline 22. Enhanced, the gas output of coalbed methane increases, and then the coal water discharge valve 5 is opened, and the deep well drainage device discharges the coal water mixture through the conduit 8 at the bottom of the upper body A to the coal water discharge pipeline 7, and then enters the coal water separation device 2, and the coal water mixture Separation and filtration are carried out in the coal-water separation device 2, the exhaust valve 9 and the sewage valve 13 are opened, the separated coalbed methane and coal particle impurities are discharged from the exhaust port 10 and the sewage outlet 14 respectively, and the drain valve 11 is opened, and the separated Water can be injected into the four-way 19 for recycling. At the same time, the gas outlet valve 26 is controlled so that the coalbed methane leaked from the downhole enters the gas outlet pipeline 27, and then is filtered by the filter 24, and is continuously and stably discharged from the gas outlet pipeline 23. the

Finally, the utility model improves the original wellhead device, integrates the functions of coal discharge, exhaust, and water injection, and the water separated by the coal-water separation device can be recycled. The utility model has a simple and compact structure and is easy to install , In addition, the utility model adopts sealing elements made of stainless steel and rubber, which can withstand high pressure and have a good sealing effect. the

Claims (1)

1. a coal bed gas well array coal water water filling exhaust wellhead assembly is made up of from device (2), big syphon (4), row's coal water valve (5), middle flange (6), draining valve (11), big flange (15), casing flange (16), filling pipe (17), water injection valve (18), four-way (19), one way valve (20), little flange (21), outlet pipe (23), strainer (24), little bend pipe (25), air outlet valve (26), bolt (28) upper body (A), moisture content of coal; Upper body (A) is fastenedly connected by bolt (28) and casing flange (16), big flange (15), middle flange (6), little flange (21), air outlet valve (26) is fixed on above the upper body (A), moisture content of coal is fixedly installed togather with big flange (15) and middle flange (6) respectively from device (2) and row's coal water valve (5), row's coal water valve (5), moisture content of coal passes through middle flange (6) respectively from device (2) and one way valve (20), big flange (15), little flange (21) is fastenedly connected with upper body (A), big syphon (4) head and the tail are connected with the mixture inlet (3) of moisture content of coal from device (2) with row's coal water valve (5) respectively, the upper end of little flange (21) is installed with one way valve (20), the bottom of four-way (19) and one way valve (20) are fixed together, the left end of four-way (19) is equipped with the draining valve (11) that is connected with outfall (12), all the other ends of four-way (19) are equipped with the draining valve (18) that is connected with filling pipe (17), the lower end of little bend pipe (25) and air outlet valve (26) are installed together, and the upper end of little bend pipe (25) is equipped with the strainer (24) of fixedlying connected with outlet pipe (23); It is characterized in that: be provided with three independent pipelines in upper body (A), the row's of being respectively coal water lines (7), water injecting pipeline (22) and outlet pipe (27).

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