A blowout prevention, collection and separation device for upward drilling

Abstract

A blowout prevention, collection and separation device for upward drilling comprises three main parts: a fixing assembly, a sealing assembly, and a collection-separation assembly. The fixing assembly (1) is composed of four stainless steel columns and eight stainless steel composite pipes, and the stainless steel columns and the stainless steel composite pipes are connected by spiral compression springs and threads. The sealing assembly (2) is composed of four stainless steel columns and eight stainless steel composite pipes, a sealing ring (8) and a nylon cloth (9), and four high-strength retractable stainless steel columns (5) are all connected to the collection-separation device. The advantages are: the present invention can effectively reduce the problem of gas exceeding the limit caused by the drilling of the blowout hole, eliminate the major safety hazards caused by the implementation of permeability enhancement measures in the mine, and protect the lives of coal mine workers. The present invention is simple to operate, safe and reliable, and has important significance for preventing the problems such as gas exceeding the limit caused by the blowout hole that often occur during the currently widely used high-pressure water jet cutting and hydraulic punching construction.

Description

Technical Field

[0001] The invention relates to the technical field of coal mine gas disaster control, in particular to a blowout prevention device assisting high-pressure water jet cutting, hydraulic hole expansion and hydraulic punching to prevent blowouts. Background Art

[0002] With the continuous development of my country's socioeconomic landscape, the demand for coal resources is increasing. Shallow resources are gradually depleting, prompting an increasing number of coal mines to move deeper. As mining depth increases, gas content and pressure increase, and coal seam permeability decreases. To effectively manage gas hazards and ensure safe and efficient mining in deep mines, the principle of "extraction before mining, monitoring and supervision, and production based on wind speed" must be strictly implemented. This "extraction before mining" approach is the foundation of gas prevention and control, serving as a fundamental and crucial approach to addressing gas at its source. In production practice, to optimize gas extraction, a series of coal seam permeability enhancement measures are often implemented during the construction of gas extraction boreholes, accelerating and improving gas extraction efficiency. Currently, common measures include high-pressure water jet slitting, hydraulic hole expansion, and hydraulic punching. However, due to the high gas pressure and gas content in deep coal seams, these permeability enhancement measures effectively disrupt the coal seam. This disturbance can cause the coal seam to become unstable and a mixture of coal slag, water, and gas can rapidly gush out of the borehole, a phenomenon known as blowhole formation. Since blowhole formation is often accompanied by large amounts of coal slag and gas, if not promptly addressed, it can lead to gas overshoot or even gas explosions, posing a serious threat to the lives of construction workers. Therefore, a device is needed to assist high-pressure water jet cutting to effectively prevent these gas overshoots and even explosions.

[0003] The invention patent with application number CN201610840182.2 discloses a device and method for preventing blowouts and outbursts in high-gas outburst coal seam drilling and hydraulic cutting. The invention patents with application numbers 201921774879.X and 201921774879.X disclose a gas-water-slag separation device for preventing gas blowouts. The sealing method adopted in these two inventions is capsule sealing. During on-site construction, it is first necessary to use a large-diameter drill bit to expand the hole after the through-layer drilling is completed. Then, a short capsule sealing casing is placed in the borehole and the capsule is injected with liquid to expand its volume. Finally, the hole wall is sealed by the expansion of the capsule, thereby achieving rapid sealing of the borehole and fixing the casing. However, this method has the following drawbacks: first, it increases the number of construction steps; second, water inevitably seeps between the short capsule sealing sleeve and the hole wall during construction, affecting the stability of the capsule sealing tube. Especially during severe blowouts, the short capsule sealing sleeve must withstand the strong impact of water and coal slag, which further affects the stability of the capsule sealing tube and threatens the safety of construction workers. Therefore, it still has significant drawbacks in actual application. Summary of the Invention

[0004] The present invention provides a blowout prevention, collection, and separation device for upward drilling to address the potential gas overrun and even gas explosion caused by gas blowouts during high-pressure water jet slitting, high-pressure hydraulic punching, and hydraulic hole expansion. The present invention securely secures the device in tunnels under various conditions using high-strength, retractable steel columns in the fixing assembly. High-strength, retractable steel columns and nylon cloth in the sealing assembly create a stable and reliable gas, water, and slag transport channel between the borehole and the collection and separation assembly. Alternating baffles and powerful springs in the collection and separation assembly weaken the powerful impact force generated by the water and slag gushing out of the borehole. Ultimately, the negative pressure provided by the gas extraction pipe discharges gas from the gas extraction port and the water and slag from the water and slag discharge port, thereby achieving separation of gas, water, and slag. This prevents blowouts from occurring in the borehole, which can cause gas overrun and even gas explosions. This eliminates a major safety hazard associated with high-pressure water jet slitting, hydraulic punching, and hydraulic hole expansion, and protects the lives of coal miners.

[0005] A blowout prevention, collection and separation device for upward drilling comprises a fixed component (1), a hole sealing component (2) and a collection-separation component (3). The four stainless steel columns in the fixed component (1) are firmly welded to the collection-separation component (3). The four stainless steel columns in the hole sealing component (2) are connected to the collection-separation component (3) and can rotate freely. The nylon cloth (9) in the hole sealing component (2) is connected to the four stainless steel columns, its lower end opening is connected to the collection-separation component (3), and its upper end opening is connected to the hole sealing ring (8). The shape of the gas, water and slag migration channel formed by the nylon cloth (9) between the outside of the borehole and the collection-separation component is determined by the stainless steel columns. The collection-separation component (3) is fixed in the construction tunnel through the fixed component (1), wherein a baffle and a strong spring are provided, and a gas extraction port (6) and a water slag discharge port (7) are opened on the side.

[0006] The fixing assembly (1) is composed of four high-strength retractable stainless steel columns (4), which are firmly welded to the collection-separation device. Each stainless steel column is composed of three hollow stainless steel rods of different diameters. The first and second sections are connected by threads, such as Figure 5 As shown, the inner surface of the second section of the hollow stainless steel rod is in smooth contact with the outer surface of the third section of the hollow stainless steel rod, and a spring is installed between them. Figure 4 shown.

[0007] The sealing assembly (2) is composed of four high-strength retractable stainless steel columns (5), a sealing ring (8) and a nylon cloth (9). The four high-strength retractable stainless steel columns (5) are all connected to the collection-separation device and can rotate freely. Each stainless steel column is composed of three sections of hollow stainless steel rods with different diameters. The first section and the second section are connected by a thread, such as Figure 5 As shown, the inner surface of the second section of the hollow stainless steel rod is in smooth contact with the outer surface of the third section of the hollow stainless steel rod, and a spring is installed between them. Figure 4 shown.

[0008] The collecting and separating device (3) comprises a collecting box (10), a baffle (12), a spring (14), a gas extraction port (6) and a water slag discharge port (7). The baffle is connected to the collecting box (10) in a hinged manner, and a spring (14) is installed below the baffle. The baffle can rotate around the hinge support (11) along the motion track (13) under the impact of the water slag, and the baffles are arranged alternately and facing each other.

[0009] The advantages of the blowout prevention, collection and separation device for upward drilling of the present invention are: when performing permeability enhancement measures such as high-pressure water jet cutting, hydraulic hole expansion and hydraulic punching in deep mines, the present invention can construct a stable and reliable gas, water and coal slag migration channel outside the borehole, and eliminate the strong impact force generated when water slag flows out of the borehole in the collection-separation component, and discharge gas from the gas extraction port with the help of the negative pressure provided by the gas extraction pipe, and discharge water slag at the water slag discharge port, thereby realizing the separation of gas, water and slag, preventing the occurrence of blowout holes in the borehole causing gas over-limit or even gas explosion accidents, eliminating a major safety hazard existing in high-pressure water jet cutting, hydraulic punching and hydraulic hole expansion, and ensuring the safety of coal miners. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a front view of a blowout prevention, collection and separation device for upward drilling according to the present invention;

[0011] Figure 2 This is a rear view of a blowout prevention, collection and separation device for upward drilling according to the present invention;

[0012] Figure 3 This is a top view of a blowout prevention, collection and separation device for upward drilling according to the present invention;

[0013] Figure 4 This is a partial enlarged view of area A of a blowout prevention, collection and separation device for upward drilling according to the present invention;

[0014] Figure 5 This is a partial enlarged view of area B of a blowout prevention, collection and separation device for upward drilling according to the present invention;

[0015] Figure 6 This is a cross-sectional view of a blowout prevention, collection and separation device for upward drilling according to the present invention;

[0016] Figure 7 This is a cross-sectional view II-II of a blowout prevention, collection and separation device for upward drilling according to the present invention;

[0017] Figure 8 This is a cross-sectional view of a blowout prevention, collection and separation device for upward drilling according to the present invention;

[0018] Figure 9 This is a cross-sectional view of a blowout prevention, collection and separation device for upward drilling according to the present invention;

[0019] Figure 10 This is a cross-sectional view V-V of a blowout prevention, collection and separation device for upward drilling according to the present invention;

[0020] Figure 11 This is a VI-VI cross-sectional view of a blowout prevention, collection and separation device for upward drilling according to the present invention;

[0021] Figure 12 VII-VII is a cross-sectional view of a blowout prevention, collection and separation device for upward drilling according to the present invention;

[0022] Figure 13 This is a field implementation diagram of a blowout prevention, collection and separation device for upward drilling according to the present invention;

[0023] In the figure: 1 is a fixed component, 2 is a sealing component, 3 is a collection-separation component, 4 is a high-strength retractable stainless steel column of the fixed component, 5 is a high-strength retractable stainless steel column of the sealing component, 6 is a gas extraction port, 7 is a water slag discharge port, 8 is a sealing ring, 9 is a nylon cloth, 10 is a collection box, 11 is a baffle hinge fulcrum, 12 is a stainless steel baffle, 13 is a baffle movement trajectory, and 14 is a cylindrical coil spring. DETAILED DESCRIPTION

[0024] The following is combined with the attached Figure 1 , the present invention is further described as follows: a blowout prevention, collection and separation device for upward drilling, comprising a fixed component (1), a sealing component (2) and a collection-separation component (3). The four stainless steel columns in the fixed component (1) are firmly welded to the collection-separation component (3). The four stainless steel columns in the sealing component (2) are connected to the collection-separation component (3) and can rotate freely. The nylon cloth (9) in the sealing component (2) is connected to the four stainless steel columns, its lower end opening is connected to the collection-separation component (3), and its upper end opening is connected to the sealing ring (8). The shape of the gas, water and slag migration channel formed by the nylon cloth (9) between the outside of the borehole and the collection-separation component is determined by the stainless steel columns. The collection-separation component (3) is fixed in the construction tunnel through the fixed component (1), wherein a baffle and a strong spring are provided, and a gas extraction port (6) and a water slag discharge port (7) are opened on the side.

[0025] The fixing assembly (1) is composed of four high-strength retractable stainless steel columns (4), which are firmly welded to the collection-separation device. Each stainless steel column is composed of three hollow stainless steel rods of different diameters. The first and second sections are connected by threads, such as Figure 5 As shown, the inner surface of the second section of the hollow stainless steel rod is in smooth contact with the outer surface of the third section of the hollow stainless steel rod, and a spring is installed between them. Figure 4 shown.

[0026] The sealing assembly (2) is composed of four high-strength retractable stainless steel columns (5), a sealing ring (8) and a nylon cloth (9). The four high-strength retractable stainless steel columns (5) are all connected to the collection-separation device and can rotate freely. Each stainless steel column is composed of three sections of hollow stainless steel rods with different diameters. The first section and the second section are connected by a thread, such as Figure 5As shown, the inner surface of the second section of the hollow stainless steel rod is in smooth contact with the outer surface of the third section of the hollow stainless steel rod, and a spring is installed between them. Figure 4 shown.

[0027] The collecting and separating device (3) comprises a collecting box (10), a baffle (12), a spring (14), a gas extraction port (6) and a water slag discharge port (7). The baffle is connected to the collecting box (10) in a hinged manner, and a spring (14) is installed below the baffle. The baffle can rotate around the hinge support (11) along the motion track (13) under the impact of the water slag, and the baffles are arranged alternately and facing each other.

[0028] The present invention is achieved in that:

[0029] ① Place the equipment according to the site conditions and the location of the drilling rig, adjust the thread on the stainless steel column (4) to extend it to the top plate of the roadway and apply a certain prestress to the spring therein to completely fix the collection-separation device;

[0030] ② According to the construction drilling position, the thread on the stainless steel column (5) is adjusted so that the sealing ring (8) is tightly attached to the tunnel roof and the drilled hole is roughly located at the center of the sealing ring. At the same time, a certain prestress is applied to the spring on the stainless steel column (5) to ensure that the sealing assembly is stable and reliable;

[0031] ③ Place the drilling rig, insert the drill bit and drill rod through the drill rod opening (10) into the sealing assembly until it reaches the drill hole;

[0032] ④ Connect the gas drainage port (6) to the gas drainage pipe and turn on the drainage switch to form a drainage negative pressure in the entire device. Under the action of the gas drainage pipe, the equipment is officially put into operation. Then, high-pressure water jet cutting or hydraulic punching and other anti-burst measures are implemented;

[0033] ⑤ After the measures are completed, pull out the drill bit and drill rod, adjust the position of the sealing assembly, and then continue to implement the anti-blowout measures for the next borehole according to steps ① to ④.

[0034] The present invention assists with high-pressure water jet cutting, hydraulic punching and other anti-burst measures, effectively preventing accidents such as gas over-limit and even gas explosions caused by blowhole phenomena. The present invention was field-tested in the middle bottom lane of a large mining face in a certain mine in Henan Province. By comparing the test results, it was found that before the use of the present invention, the incidence of gas over-limit caused by blowhole phenomena during the implementation of anti-burst measures was 60% to 70%. After using the device of the present invention, the incidence of gas over-limit caused by blowhole phenomena during the implementation of high-pressure water jet cutting and anti-burst pulling measures was 5% to 8%. The incidence of gas over-limit phenomena was greatly reduced, and the safety of construction site operations was greatly improved.

Claims

1. A blowout prevention, collection and separation device for upward drilling, characterized by: The invention comprises a fixing assembly (1), a sealing assembly (2) and a collecting-separating assembly (3), wherein the fixing assembly (1) is composed of four high-strength retractable stainless steel columns (4), each of which is firmly welded to the collecting-separating assembly (3), and each of which is composed of three sections of hollow stainless steel rods with different diameters. The outer diameter of the first hollow stainless steel rod is 55 mm and the inner diameter is 50 mm. The outer diameter of the second hollow stainless steel rod is 65 mm and the inner diameter is 55 mm. The outer diameter of the third hollow stainless steel rod is 75 mm and the inner diameter is 65 mm. The first hollow stainless steel rod and the second hollow stainless steel rod are connected by threads. The inner surface of the second hollow stainless steel rod is in smooth contact with the outer surface of the third hollow stainless steel rod. A spring is installed therebetween, so that the four stainless steel columns can freely adjust their lengths according to different working conditions and have a certain deformation capacity, thereby ensuring that the entire device can remain absolutely fixed when subjected to impact. The collecting and separating assembly (3) is fixed to the construction tunnel via the retractable stainless steel column (4); The sealing assembly (2) is composed of four high-strength retractable stainless steel columns (5), a sealing ring (8) and a nylon cloth (9). The nylon cloth (9) in the sealing assembly (2) is connected to the four stainless steel columns, and its lower end opening is connected to the collecting-separating assembly (3), and its upper end opening is connected to the sealing ring (8). The shape of the gas-water-slag migration channel formed by the nylon cloth (9) between the outside of the drill hole and the collecting-separating assembly (3) is determined by the stainless steel columns. The four high-strength retractable stainless steel columns (5) are all connected to the collecting-separating assembly (3) and can rotate freely. The collecting and separating assembly (3) is composed of a collecting box (10), a baffle (12), a spring (14), a gas extraction port (6) and a water slag discharge port (7); The baffle (12) is hingedly arranged on the collecting box (10), the baffle (12) is connected to one end of the spring (14), and the baffles (12) are arranged facing each other in sequence; The spring (14) is located under the baffle (12), and the baffle (12) can rotate around the hinge fulcrum (11) along the motion track (13), and the baffles (12) are arranged alternately and facing each other; the other end of the spring is connected to the collection box (10); The collecting box (10) comprises a drill pipe opening and a base, and the base is extended in the direction of the drill pipe opening; The drilling rig is placed, and the drill bit and drill rod are inserted into the hole sealing assembly through the drill rod opening until they are drilled into the hole.

2. The blowout prevention, collecting and separating device for upward drilling according to claim 1, characterized in that: The sealing component (2) is composed of four high-strength retractable stainless steel columns (5), a sealing ring (8) and a nylon cloth (9). The four high-strength retractable stainless steel columns (5) are all connected to the collection-separation component (3) and can rotate freely. Each stainless steel column is also composed of three sections of hollow stainless steel rods with different diameters. The outer diameter of the first hollow stainless steel rod is 35mm and the inner diameter is 30mm. The outer diameter of the second hollow stainless steel rod is 45mm and the inner diameter is 40mm. The outer diameter of the third hollow stainless steel rod is 55mm and the inner diameter is 50mm. The first hollow stainless steel rod and the second hollow stainless steel rod are connected by threads. The inner surface of the second hollow stainless steel rod is in smooth contact with the outer surface of the third hollow stainless steel rod. A spring is installed between them to ensure the stability of the sealing component and to automatically adjust the size of the stainless steel column when subjected to impact force, thereby ensuring the absolute sealing and reliability of the sealing component.

3. The blowout prevention, collecting and separating device for upward drilling according to claim 1, characterized in that: The thickness of the iron plate of the collecting box (10) is not less than 40mm, the baffle (12) is a rectangle with a thickness of not less than 30mm, a length of not less than 400mm, and a width of not less than 200mm, and the slag discharge port (7) is a square with a side length of 150mm.

4. The blowout prevention, collecting and separating device for upward drilling according to claim 1, characterized in that: A sealed and reliable gas, water and slag transport channel is formed outside the borehole. The baffles and springs arranged opposite to each other in the collecting and separating component (3) counteract the strong impact force generated by the discharge of water and slag when the borehole blows out. Finally, the gas is discharged through the gas extraction port and the water and slag are discharged through the water and slag discharge port, thereby preventing gas over-limit or even gas explosion accidents caused by the borehole blowout.

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