Blowout preventer for underground gas extraction

Abstract

The utility model relates to the technical field of gas extraction, in particular to an underground gas extraction blowout preventer, and mainly solves the technical problems that the existing gas extraction blowout preventer is high in spewing control difficulty, high in safety risk and high in sprayed slag cleaning workload. The device comprises a movable chassis, a deslagging box, a multi-way pipe, a drilling machine through pipe, a coal seam drilling pipe, a negative pressure pipe, a pressure relief buffer cover, a deslagging pipe and a pressure sensor. According to the device, gushing is detected through the pressure sensor, on-off of the negative pressure pipe and the slag discharging pipe is controlled in a feedback mode, dependence on manual experience is not needed, it can be guaranteed that gushing and corresponding equipment are started consistently, and the gushing control difficulty is greatly reduced; meanwhile, water and residual materials for slag spraying can be discharged into the slag discharging box through the slag discharging pipe in time to be collected, and the workload of slag spraying and cleaning is reduced; the device is further provided with a pressure relief buffer cover, when the pressure is too large due to gushing, buffering can be conducted through the pressure relief buffer cover, and damage to the device caused by the too large pressure is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to gas extraction technical field especially relates to a downhole gas extraction blowout preventer. BACKGROUND

[0002] The gas extraction blowout preventer mainly through special pipeline and extraction equipment, gas is extracted from the downhole and is discharged to the safe area or is utilized to prevent the accumulation and leakage of gas in the downhole, thereby reducing the occurrence of gas explosion accidents and improving the safety factor of downhole operation.

[0003] The existing gas extraction blowout preventer has the following defects: first, gas extraction can cause gushing, and each gushing needs to be opened according to manual judgment corresponding equipment, but the gushing and the opening of the corresponding equipment are difficult to keep consistent, and the gushing control is difficult; second, the gushing corresponding equipment has limited buffering capacity, and there is a great safety risk; third, the water and residual material of drilling hole gushing slag are not cleaned by special equipment, resulting in large subsequent cleaning workload. SUMMARY

[0004] In order to overcome the technical defects of the existing gas extraction blowout preventer, such as large gushing control difficulty, large safety risk and large gushing slag cleaning workload, the utility model provides a downhole gas extraction blowout preventer.

[0005] The downhole gas extraction blowout preventer provided by the utility model comprises:

[0006] A mobile chassis;

[0007] A slag discharge box fixed on the mobile chassis;

[0008] A multi-pass pipe installed above the slag discharge box and arranged along the front and rear directions;

[0009] A drilling machine pass pipe coaxially connected to the rear end of the multi-pass pipe;

[0010] A coal seam drill pipe coaxially connected to the front end of the multi-pass pipe and provided with an expansion sealing sleeve;

[0011] A negative pressure pipe communicated on the pipe wall of the multi-pass pipe and used for connecting a gas collection device, the negative pressure pipe is provided with a first valve;

[0012] A pressure relief buffer cover communicated on the pipe wall of the multi-pass pipe;

[0013] A slag discharge pipe with one end communicated on the pipe wall of the multi-pass pipe, the other end of the slag discharge pipe is communicated with the slag discharge box through a second valve;

[0014] A pressure sensor is arranged on the wall of the multi-pass pipe and used to detect the air pressure in the multi-pass pipe, and the pressure sensor is in communication connection with the first valve and the second valve to control the first valve and the second valve to open when the detected pressure signal reaches a target value.

[0015] Optionally, the slag discharge box is provided with a pressure relief port, and the pressure relief port is provided with an openable and closable pressure relief cover.

[0016] Optionally, the rear end of the slag discharge box is communicated with a blowdown pipe, and the blowdown pipe is communicated with the lowest liquid level of the slag discharge box.

[0017] Optionally, a guide plate is arranged in the slag discharge box, and the guide plate is arranged obliquely to guide the jet flow to the blowdown pipe.

[0018] Optionally, the pressure relief buffer cover is a corrugated cover and is provided with a hook at the top.

[0019] Optionally, the slag discharge pipe comprises a rigid pipe section and a corrugated pipe section in communication with each other, the rigid pipe section is communicated with the multi-pass pipe, and the corrugated pipe section is communicated with the slag discharge box.

[0020] Optionally, the multi-pass pipe is installed on the slag discharge box through a gantry, and the cross beam of the gantry is arranged in the left-right direction.

[0021] Optionally, the multi-pass pipe is installed on the cross beam of the gantry and can be driven to move in the left-right direction.

[0022] Optionally, the gantry is installed on the slag discharge box and can be driven to move in the front-rear direction.

[0023] Optionally, the mobile chassis comprises a mobile plate and at least three universal wheels installed below the mobile plate, and the slag discharge box is fixed on the mobile plate.

[0024] The technical scheme provided by the utility model has the following advantages compared with the prior art:

[0025] The downhole gas extraction blowout prevention device provided by the utility model, when in use, the coal seam drill pipe is inserted into the drill hole and sealed between the coal seam drill pipe and the drill hole wall through the expansion sealing sleeve, the drill rod penetrates the drill pipe, the multi-way pipe and the coal seam drill pipe in sequence and extends into the drill hole for drilling, the generated gas and the spouted residue flow into the multi-way pipe, when the pressure sensor detects that the pressure signal reaches the target value, the first valve is opened to make the negative pressure pipe communicate with the multi-way pipe, the second valve is opened to make the residue discharge pipe communicate with the multi-way pipe, the gas such as gas is sucked to the gas collection equipment through the negative pressure pipe under the action of negative pressure, and the water and the residual material of the spouted residue flow to the residue discharge box through the residue discharge pipe under the action of gravity. BRIEF DESCRIPTION OF DRAWINGS

[0026] The drawings incorporated into the specification and forming a part thereof, illustrate embodiments consistent with the present utility model, and together with the description, serve to explain the principles of the present utility model.

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description, and obviously, for those skilled in the art, other drawings can also be obtained without creative labor according to these drawings.

[0028] Figure 1 Fig. 1 shows a first perspective view of the downhole gas extraction blowout prevention device in the embodiments of the present utility model;

[0029] Figure 2 Fig. 2 shows a second perspective view of the downhole gas extraction blowout prevention device in the embodiments of the present utility model.

[0030] In the drawings:

[0031] 1, mobile chassis; 11, mobile plate; 12, universal wheel; 2, residue discharge box; 21, pressure relief port; 22, pressure relief cover; 23, pollution discharge pipe; 24, flow guide plate; 3, multi-way pipe; 31, gantry; 4, drilling machine pipe; 5, coal seam drilling pipe; 51, expansion sealing sleeve; 6, negative pressure pipe; 61, first valve; 7, pressure relief buffer cover; 71, hook; 8, residue discharge pipe; 81, rigid pipe section; 82, corrugated pipe section; 83, second valve; 9, pressure sensor. DETAILED DESCRIPTION

[0032] In order to enable the above-mentioned purposes, features and advantages of the present application to be more clearly understood, the scheme of the present application will be further described below. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0033] In the description, it should be noted that the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance. It should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be connected inside two elements. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0034] In the following description, many specific details are set forth in order to provide a thorough understanding of the present application, but the present application can also be implemented in other ways different from those described herein; Obviously, the examples in the description are only a part of the embodiments of the present application, not all the embodiments.

[0035] The following will be combined Figure 1 And Figure 2 The specific embodiments of the present application will be described in detail.

[0036] The present embodiment provides a kind of well gas extraction blowout preventers, including mobile chassis 1, residue discharge box 2, multi-way pipe 3, drilling machine pipe 4, coal seam drilling pipe 5, negative pressure pipe 6, pressure relief buffer cover 7, residue discharge pipe 8 and pressure sensor 9.

[0037] Among them, mobile chassis 1 is mainly used to carry other components and give the whole device walking ability.

[0038] Specifically, the mobile chassis 1 of the present embodiment includes a mobile plate 11 and at least three universal wheels 12 installed below the mobile plate 11. The device can be conveniently moved to the appropriate position through the universal wheel 12 to avoid affecting the action of other devices.

[0039] More specifically, the universal wheel 12 of the embodiment is provided four and is distributed below the four corners of the moving plate 11.

[0040] Wherein, the residue discharging box 2 is fixed on the moving chassis 1.

[0041] Specifically, the residue discharging box 2 of the embodiment is provided with a stepped mounting groove on the upper surface of the rear end, for installing a control box or the like structure.

[0042] Further, the residue discharging box 2 of the embodiment is provided with a pressure relief port 21, which is provided with a pressure relief cover 22 capable of being opened and closed. Since the pressure in the residue discharging box 2 will increase with the increase of the amount of residue injection, the accumulated gas at the top of the residue discharging box 2 can be discharged through the pressure relief port 21, facilitating the subsequent injection of residue into the residue discharging box 2.

[0043] Further, the rear end of the residue discharging box 2 is communicated with a sewage pipe 23, which is communicated with the lowest liquid level of the residue discharging box 2. In use, the sewage pipe 23 can be communicated with a residue collection device, so that the residue in the residue discharging box 2 can be discharged into the residue collection device through the sewage pipe 23 for centralized treatment.

[0044] Further, the residue discharging box 2 is provided with a flow guide plate 24, which is inclined to guide the flow of residue to the sewage pipe 23. In use, the residue in the multi-pass pipe 3 falls onto the flow guide plate 24 through the residue discharging pipe 8, and then flows to the position where the sewage pipe 23 is located through the flow guide plate 24, which is more conducive to the discharge of residue.

[0045] Specifically, the flow guide plate 24 of the embodiment is provided with two, which are distributed above and below and have opposite inclined directions, and the two flow guide plates 24 cooperate to guide the residue from the residue discharging pipe 8 to the sewage pipe 23.

[0046] Wherein, the multi-pass pipe 3 is installed above the residue discharging box 2 and the axis is arranged in the front-rear direction.

[0047] Specifically, the multi-pass pipe 3 of the embodiment is installed on the residue discharging box 2 through a gantry 31, the crossbeam of the gantry 31 is arranged in the left-right direction, that is, the column of the gantry 31 is installed on the residue discharging box 2, and the multi-pass pipe 3 is installed on the crossbeam of the gantry 31.

[0048] More specifically, the multi-pass pipe 3 of the embodiment is installed on the crossbeam of the gantry 31 and can be driven to move in the left-right direction. The multi-pass pipe 3 is more convenient to align the drill hole through the adjustment of the left-right position. Specifically, a first rack arranged in the left-right direction is fixed on the crossbeam of the gantry 31, a first motor is installed on the multi-pass pipe 3, a first gear is sleeved on the output shaft of the first motor, the first gear is engaged with the first rack, and the output shaft of the first motor drives the first gear to rotate, thereby realizing the left-right movement of the multi-pass pipe 3.

[0049] More specifically, the gantry 31 of the embodiment is mounted on the slag discharge box 2 and is driven to move in the front-rear direction. The gantry 31 is more convenient for the operator to operate through the adjustment of the front-rear position. In detail, the embodiment is provided with a second rack arranged in the front-rear direction on the slag discharge box 2, and the gantry 31 is provided with a second motor, the output shaft of the second motor is sleeved with a second gear, the second gear is engaged with the second rack, and the output shaft of the second motor drives the second gear to rotate, thereby realizing the front-rear movement of the gantry 31.

[0050] The drill pipe 4 is coaxially connected to the rear end of the multi-way pipe 3.

[0051] It is easy to understand that the drill pipe 4 is used to connect other structures of the drilling machine and is used for the drilling rod of the drilling machine to pass through.

[0052] It should be noted that the drill pipe 4 is generally sealed and connected with the corresponding structure, but due to the existence of the negative pressure pipe 6, even if this place is not sealed, the negative pressure pipe 6 will suck the gas on both sides of the position where it is located into it, that is, the airflow flowing to the negative pressure pipe 6 will also be formed at the position where the drill pipe 4 is located, and it will not cause a large amount of leakage of gas such as gas, which can meet the safety requirements. As for the structure connected by the drill pipe 4, it is determined according to the use requirement, which is easily designed by those skilled in the art.

[0053] The coal seam drill pipe 5 is coaxially connected to the front end of the multi-way pipe 3 and is provided with an expansion sealing sleeve 51.

[0054] It is easy to understand that each layer of drill pipe needs to extend outwardly on the front side of the slag discharge box 2 to be able to extend into the drill hole.

[0055] It should be noted that the expansion sealing sleeve 51 is a structure that can expand radially by filling gas or liquid, and the expansion sealing sleeve 51 is a mature structure in the art, which will not be described here.

[0056] The negative pressure pipe 6 is communicated on the pipe wall of the multi-way pipe 3 and is used to connect the gas collection equipment, and the negative pressure pipe 6 is provided with a first valve 61.

[0057] It should be noted that the negative pressure pipe 6 can be connected with the gas collection equipment through a deformable structure such as a corrugated pipe, which can avoid the position change caused by the front-rear movement of the gantry 31 or the left-right movement of the multi-way pipe 3.

[0058] The pressure relief buffer cover 7 is communicated on the pipe wall of the multi-way pipe 3.

[0059] It is easy to understand that the pressure relief buffer cover 7 is a flexible and variable structure, which can buffer when the pressure suddenly increases due to gushing to avoid damage to the device by the pressure.

[0060] Specifically, the pressure relief buffer cover 7 of the embodiment is a bellows cover and is provided with a hook 71 at the top. The bellows cover has strong stretching and deforming capacity and strong buffering capacity. The bellows cover can be hung on the roof of the mine through the hook 71, thereby reducing the occupation of the limited space and ensuring the structural stability.

[0061] The other end of the deslagging pipe 8 is communicated with the deslagging box 2 through a second valve 83.

[0062] Specifically, the deslagging pipe 8 of the embodiment comprises a rigid pipe section 81 and a bellows pipe section 82 which are communicated with each other, the rigid pipe section 81 is communicated with the multi-way pipe 3, and the bellows pipe section 82 is communicated with the deslagging box 2. The rigid pipe section 81 is mainly used to ensure the processing convenience of the connection structure of the multi-way pipe 3 and the deslagging pipe 8, and the bellows pipe section 82 is mainly used to avoid the position change caused by the forward and backward movement of the gantry 31 or the left and right movement of the multi-way pipe 3.

[0063] Specifically, the second valve 83 of the embodiment adopts a pressure butterfly valve, and the communication or blockage between the multi-way pipe 3 and the deslagging box 2 is controlled by the opening and closing of the pressure butterfly valve.

[0064] The pressure sensor 9 is arranged on the pipe wall of the multi-way pipe 3 and is used to detect the air pressure in the multi-way pipe 3. The pressure sensor 9 is in communication connection with the first valve 61 and the second valve 83 to control the opening of the first valve 61 and the second valve 83 when the detected pressure signal reaches the target value.

[0065] It is easy to understand that the pressure sensor 9 can be configured with a controller in use, and a control program is arranged in the controller to ensure that the first valve 61 and the second valve 83 are opened when the pressure signal detected by the pressure sensor 9 reaches the target value.

[0066] The working principle of the downhole gas extraction blowout prevention device of the embodiment is as follows:

[0067] In work, the operator moves the device as a whole to the target position through the movement of the base plate 1, and aligns the drill hole through the left and right movement of the multi-way pipe 3, and then makes each layer of drill pipe extend into the drill hole through the forward and backward movement of the gantry 31, and then inflates the gas or liquid into the sealing expansion sleeve to make it expand and abut against the hole wall of the drill hole to complete the sealing, and then the drill rod of the drilling machine is extended into the drill hole through the drill machine pipe 4, the multi-way pipe 3 and the coal seam drill pipe 5 in turn, and the drill machine pipe 4 is docked with the corresponding structure, and finally the drilling rod is started to drill.

[0068] When the gushing occurs in the drilling process, the pressure sensor 9 detects the pressure increase, when the pressure increases to the target value, the pressure sensor 9 feeds back to control the first valve 61 and the second valve 83 to open, the gushing gas such as gas is sucked away through the negative pressure pipe 6, the gushing water and residual material enter the residue discharge tank 2 through the residue discharge pipe 8, the gushing slag is guided to the residue discharge pipe 23 under the guiding action of the guide plate 24, and then is discharged into the gushing slag collecting device; if the gushing pressure is too large, the pressure relief buffer cover 7 can be self-inflated to buffer the large pressure in the multi-way pipe 3, so that the device is prevented from being damaged.

[0069] The above is only the specific implementation manner of the present application, and enables the skilled in the art to understand or implement the present application. Although the foregoing embodiments are described in detail, the ordinary skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can be modified, or some or all of the technical features can be replaced equivalently; and the modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments, and should be covered in the protection scope of the claims.

Claims

1. A gas extraction blowout preventer for use downhole, the blowout preventer comprising: The utility model relates to a coal seam drilling device, which comprises: a mobile chassis (1); a slag discharge box (2) fixed on the mobile chassis (1); a multi-pass pipe (3) installed above the slag discharge box (2) and having an axis arranged in the front-back direction; a drilling rig pass-through pipe (4) coaxially connected to the rear end of the multi-pass pipe (3); a coal seam drilling pipe (5) coaxially connected to the front end of the multi-pass pipe (3) and provided with an expansion sealing sleeve (51); a negative pressure pipe (6) communicated on the pipe wall of the multi-pass pipe (3) and used for connecting a gas collection device, the negative pressure pipe (6) being provided with a first valve (61); a pressure relief buffer cover (7) communicated on the pipe wall of the multi-pass pipe (3); a slag discharge pipe (8) having one end communicated on the pipe wall of the multi-pass pipe (3) and the other end communicated with the slag discharge box (2) through a second valve (83); a pressure sensor (9) arranged on the pipe wall of the multi-pass pipe (3) and used for detecting the air pressure in the multi-pass pipe (3), the pressure sensor (9) being communicatively connected with the first valve (61) and the second valve (83) to control the first valve (61) and the second valve (83) to open when the detected pressure signal reaches a target value.

2. The gas extraction blowout preventer according to claim 1, characterized in that, The slag discharge box (2) is provided with a pressure relief opening (21) configured with a pressure relief cover (22) capable of being opened and closed.

3. The downhole gas extraction blowout preventer of claim 1, wherein, The rear end of the slag discharge box (2) is communicated with a blowdown pipe (23) communicated at the lowest liquid level of the slag discharge box (2).

4. The gas extraction blowout preventer according to claim 3, characterized in that, The slag discharge box (2) is provided with a flow guide plate (24) arranged obliquely to guide the flow direction of the sprayed slag to the blowdown pipe (23).

5. The downhole gas extraction blowout preventer of claim 1, wherein, The pressure relief buffer cover (7) is a corrugated cover and is provided with a hook (71) at the top.

6. The downhole gas extraction blowout preventer of claim 1, wherein, The slag discharge pipe (8) comprises a rigid pipe section (81) and a corrugated pipe section (82) communicated with each other, the rigid pipe section (81) being communicated with the multi-pass pipe (3), and the corrugated pipe section (82) being communicated with the slag discharge box (2).

7. The downhole gas extraction blowout preventer of claim 6, wherein, The multi-pass pipe (3) is installed on the slag discharge box (2) through a portal frame (31), and the crossbeam of the portal frame (31) is arranged in the left-right direction.

8. The gas extraction blowout preventer according to claim 7, characterized in that The multi-pass pipe (3) is installed on the crossbeam of the portal frame (31) and can be driven to move in the left-right direction.

9. The downhole gas extraction blowout preventer of claim 8, wherein, The portal frame (31) is installed on the slag discharge box (2) and can be driven to move in the front-back direction.

10. The gas extraction blowout preventer according to any one of claims 1 to 9, characterized in that The mobile chassis (1) comprises a mobile plate (11) and at least three universal wheels (12) installed below the mobile plate (11), and the slag discharge box (2) is fixed on the mobile plate (11).

Images