Blowout preventer for coal mine gas extraction drilling construction

Abstract

The utility model discloses a blowout prevention device for coal mine gas extraction drilling construction, which relates to the field of coal mine drilling gas treatment devices and comprises a sleeve, a blowout prevention sealer and a buffer shell which are fixedly connected in sequence. A first connecting pipe and a second connecting pipe are arranged on the two sides of the top of the buffering shell correspondingly and used for being connected with a gas extraction pipeline system correspondingly. A third connecting pipe is arranged at the bottom of the buffering shell and used for being connected with a slag discharging box. The blowout preventer has the advantages that the gas buffer space is increased by the buffer shell, and the loading capacity of the blowout preventer is improved.

Description

Technical Field

[0001] The utility model relates to the field of coal mine drilling gas control devices, in particular to a blowout prevention device for coal mine gas extraction drilling construction. Background Art

[0002] During coal mine development, preparation, and mining, it is often necessary to drill holes in the seams and roof for gas control and water exploration. During the drilling process, abnormal gas outflow and even blowouts can occur, which can easily lead to accidents such as gas exceeding the limit at the drilling site, posing a safety threat to drilling personnel and equipment.

[0003] Therefore, when constructing gas extraction drilling holes, a blowout preventer is generally installed at the borehole mouth: first construct the borehole mouth and install a casing at the borehole mouth, install a finished blowout preventer sealer at the end of the casing, and the casing is also provided with a branch pipe connected to the gas extraction pipeline system through the pipeline. The drill rod passes through the blowout preventer sealer and the casing in turn before drilling the hole. When a large amount of gas overflows in the borehole, the blowout preventer sealer will quickly and automatically lock the drill rod to achieve sealing of the borehole mouth, so as to achieve the effect of avoiding the blowout phenomenon.

[0004] Existing blowout preventers have the following disadvantages: (1) The gas buffer zone at the orifice is small and cannot withstand high gas pressure; (2) The blowout preventer is generally connected to the extraction pipeline system by sleeve connection and pipe clamp, which is not tight and easy to fall off; (3) The function is relatively simple. Utility Model Content

[0005] The technical problem to be solved by the utility model is how to improve the pressure bearing capacity of the blowout prevention device.

[0006] The utility model solves the above-mentioned technical problems through the following technical means: a blowout preventer for coal mine gas extraction drilling construction, comprising a casing, a blowout preventer sealer and a buffer shell, wherein the casing, the buffer shell and the blowout preventer sealer are fixedly connected in sequence; a first connecting pipe and a second connecting pipe are respectively provided on both sides of the top of the buffer shell, and the first connecting pipe and the second connecting pipe are respectively used to connect to the gas extraction pipeline system; a third connecting pipe is provided at the bottom of the buffer shell, and the third connecting pipe is used to connect to the slag box. The buffer shell increases the gas buffer space and improves the pressure bearing capacity of the blowout preventer.

[0007] As an optimized technical solution, the rear end of the buffer shell is provided with a rear connecting flange fixedly connected to the front end of the sleeve, and the front end of the buffer shell is provided with a front connecting flange fixedly connected to the rear end of the blowout preventer.

[0008] As an optimized technical solution, the outlet ends of the first, second, and third connecting pipes are each provided with connecting flanges. These connecting pipes allow for flange connections between the device, the gas extraction pipeline, and the slag box, improving connection strength and preventing the pipeline from falling off.

[0009] As an optimized technical solution, a handle is provided on the top of the buffer shell. The handle can be connected to the device by a wire rope or a fixed frame, so that the device can be hoisted and fixed to the tunnel support outside the drill hole, which is convenient for hoisting and fixing the device.

[0010] As an optimized technical solution, the first connecting pipe is directly connected to the gas extraction pipeline system, and the second connecting pipe is connected to the gas extraction pipeline system after being connected to the gas-water separator.

[0011] As an optimized technical solution, the slag discharge box adopts a semi-open surface watertight slag discharge box.

[0012] As an optimized technical solution, the buffer housing is equipped with a methane sensor and a pressure sensor, and the inlet pipe of the slag box is equipped with a solenoid valve. When the pressure sensor detects that the gushing gas pressure is too high, the solenoid valve closes, preventing the gas from rushing into the slag box and ensuring safety.

[0013] As an optimized technical solution, an internal threaded sleeve is further provided on the top of the buffer shell.

[0014] As an optimized technical solution, the buffer shell includes an upper shell and a lower shell fixedly connected to the bottom of the upper shell, the first connecting pipe and the second connecting pipe are both fixedly connected to the upper shell, and the third connecting pipe is fixedly connected to the lower shell.

[0015] As an optimized technical solution, the upper shell and the lower shell are both made of stainless steel.

[0016] The advantages of the present invention are:

[0017] 1. The buffer shell increases the gas buffer space and improves the pressure bearing capacity of the blowout preventer.

[0018] 2. The flange connection between the device, the gas extraction pipeline and the slag box can be achieved through the first connecting pipe, the second connecting pipe and the third connecting pipe, which improves the connection strength and prevents the pipeline from falling off.

[0019] 3. The internal threaded sleeve is convenient for installing detection instruments, thereby expanding the monitoring function of the blowout preventer. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic front view of a blowout prevention device for coal mine gas extraction drilling construction according to an embodiment of the utility model.

[0021] Figure 2 It is a left side schematic diagram of the buffer shell according to an embodiment of the present utility model.

[0022] Figure 3 It is a right side schematic diagram of the buffer shell according to an embodiment of the present utility model. DETAILED DESCRIPTION

[0023] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0024] like Figures 1 to 3 As shown, an embodiment of the utility model discloses a blowout prevention device for coal mine gas extraction drilling construction, including a casing 1, a blowout prevention sealer 2 and a buffer shell 3.

[0025] The casing 1, the buffer shell 3 and the blowout preventer sealer 2 are fixedly connected in sequence. The casing 1 is extended into the borehole and cement slurry is filled between the casing 1 and the inner wall of the borehole to improve the sealing effect of the borehole and the fixing strength of the casing 1. The blowout preventer sealer 2 adopts the ZDWFP / 114 type blowout preventer sealer.

[0026] The rear end of the buffer shell 3 is provided with a rear connecting flange 31 fixedly connected to the front end of the sleeve 1, and the front end of the buffer shell 3 is provided with a front connecting flange 32 fixedly connected to the rear end of the blowout preventer sealer 2. The flange connection improves the connection strength.

[0027] A handle 33 is provided at the middle position of the top rear side of the buffer shell 3. The handle 33 can be connected with a wire rope or a fixing frame to hoist the entire device onto the tunnel support outside the drill hole, which is convenient for hoisting and fixing the device.

[0028] A first connecting pipe 34 and a second connecting pipe 35 are respectively provided on both sides of the top of the buffer shell 3. The first connecting pipe 34 is directly connected to the gas extraction pipeline system, and the second connecting pipe 35 is connected to the gas extraction pipeline system after being connected to the gas-water separator.

[0029] A third connecting pipe 36 is provided at the bottom of the buffer shell 3, and the third connecting pipe 36 is connected to the slag box. The slag box adopts a semi-open surface watertight slag box. The slag at the orifice can be effectively stored and cleaned regularly. The slag box is one of the commonly used equipment in coal mine gas extraction work, and is used for collecting and discharging water and slag in the extracted gas. The specific structure will not be repeated here.

[0030] The first connecting pipe 34 and the third connecting pipe 36 both use DN150 pipes, and the second connecting pipe 35 uses DN108 pipes. The outlet ends of the first connecting pipe 34, the second connecting pipe 35 and the third connecting pipe 36 are all provided with connecting flanges. The first connecting pipe 34, the second connecting pipe 35 and the third connecting pipe 36 can be used to realize flange connection between the device and the gas extraction pipeline and the slag discharge box, thereby improving the connection strength and preventing the pipeline from falling off.

[0031] Two internal threaded sleeves 37 are further provided on the top of the buffer shell 3. The internal threaded sleeves 37 are convenient for installing detection instruments, thereby facilitating the expansion of the monitoring function of the blowout preventer.

[0032] A methane sensor and a pressure sensor are installed in the two internal threaded sleeves 37 respectively. A solenoid valve is provided on the inlet pipe of the slag discharge box. When the pressure sensor detects that the pressure of the gushing gas is too high, the solenoid valve is closed to prevent the gas from rushing into the slag discharge box, thereby ensuring safety.

[0033] The buffer shell 3 includes an upper shell 38 and a lower shell 39 fixedly connected to the bottom of the upper shell 38. The rear connecting flange 31, the front connecting flange 32, the handle 33, the first connecting pipe 34, the second connecting pipe 35 and the two internal threaded sleeves 37 are all fixedly connected to the upper shell 38, and the third connecting pipe 36 is fixedly connected to the lower shell 39; the upper shell 38 and the lower shell 39 are both made of 3mm thick stainless steel with a pressure resistance of 10 to 20Mpa.

[0034] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, it should be understood by those skilled in the art that the technical solutions described in the aforementioned embodiments can still be modified, or some of the technical features thereof can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A blowout prevention device for coal mine gas extraction drilling construction, characterized by: It includes a casing, a blowout preventer seal and a buffer shell, which are fixedly connected in sequence; a first connecting pipe and a second connecting pipe are respectively provided on both sides of the top of the buffer shell, and the first connecting pipe and the second connecting pipe are respectively used to connect to the gas extraction pipeline system; a third connecting pipe is provided at the bottom of the buffer shell, and the third connecting pipe is used to connect to the slag box.

2. The blowout prevention device for coal mine gas extraction drilling construction according to claim 1 is characterized in that: The rear end of the buffer shell is provided with a rear connecting flange fixedly connected to the front end of the sleeve, and the front end of the buffer shell is provided with a front connecting flange fixedly connected to the rear end of the blowout preventer.

3. The blowout prevention device for coal mine gas extraction drilling construction according to claim 1 is characterized in that: The outlet ends of the first connecting pipe, the second connecting pipe and the third connecting pipe are all provided with connecting flanges.

4. The blowout prevention device for coal mine gas extraction drilling construction according to claim 1 is characterized in that: A handle is provided on the top of the buffer shell.

5. The blowout prevention device for coal mine gas extraction drilling construction according to claim 1 is characterized in that: The first connecting pipe is directly connected to the gas extraction pipeline system, and the second connecting pipe is connected to the gas extraction pipeline system after being connected to the gas-water separator.

6. The blowout prevention device for coal mine gas extraction drilling construction according to claim 1 is characterized in that: The slag discharge box adopts a semi-open surface watertight slag discharge box.

7. The blowout prevention device for coal mine gas extraction drilling construction according to claim 1 is characterized in that: The buffer shell is provided with a methane sensor and a pressure sensor, and the inlet pipeline of the slag discharge box is provided with a solenoid valve.

8. The blowout prevention device for coal mine gas extraction drilling construction according to claim 1 is characterized in that: An internal thread sleeve is also provided on the top of the buffer shell.

9. The blowout prevention device for coal mine gas extraction drilling construction according to claim 1, characterized in that: The buffer shell includes an upper shell and a lower shell fixedly connected to the bottom of the upper shell. The first connecting pipe and the second connecting pipe are both fixedly connected to the upper shell, and the third connecting pipe is fixedly connected to the lower shell.

10. The blowout prevention device for coal mine gas extraction drilling construction according to claim 9, characterized in that: The upper shell and the lower shell are both made of stainless steel.

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