Ladder type extraction drilling hole jetting hole buffer device

Abstract

The application discloses a stepped extraction drilling hole injection hole buffer device, which comprises a blowout prevention buffer device, a negative pressure extraction device connected to the top of the blowout prevention buffer device, and a residue discharge device connected to the bottom of the blowout prevention buffer device. The negative pressure extraction device is connected with a gas-water separator, and the gas-water separator is arranged close to the blowout prevention buffer device. The stepped pressure relief is realized through the pressure relief pipe and the buffer air bag, the running speed of the ejected gas is effectively reduced, the accumulated gas expansion pressure is buffered, the negative pressure extraction device and the buffer air bag are mechanically linked, as much ejected gas as possible is solved through extraction by adjusting the extraction negative pressure, the gas-water separator effectively separates the gas, water and residue, the solid-liquid mixture is timely discharged by the residue discharge device, the pipeline is prevented from being blocked, and the use of the injection hole buffer device is affected.

Description

Technical Field

[0001] This invention belongs to the technical field of mine gas control equipment, specifically relating to a stepped extraction borehole spray buffer device. Background Technology

[0002] A blowout refers to an abnormal dynamic phenomenon during drilling operations where, under the pressure of gas (carbon dioxide), methane and coal dust are ejected from the borehole for a short period, typically over a distance greater than 0.5 meters. The greatest danger of a blowout lies in the sudden release of a large amount of high-concentration methane from the borehole into the drilling site and roadways, causing environmental methane levels to exceed limits and potentially triggering a greater safety hazard. The most significant characteristic of a gas blowout is the instantaneous, sudden release of high-pressure, high-concentration methane; a large amount of methane is ejected into the working environment within a very short time, rendering the extraction system ineffective for a limited period. Therefore, there is an urgent need to explore a buffer device for borehole blowouts. Summary of the Invention

[0003] The purpose of this invention is to provide a stepped extraction borehole blowout buffer device, which can effectively reduce the operating speed of the ejected gas and buffer the expansion pressure of the accumulated gas.

[0004] The technical solution adopted in this invention is a stepped extraction borehole blowout buffer device, including a blowout prevention buffer device. A negative pressure extraction device is connected to the top of the blowout prevention buffer device, and a slag discharge device is connected to the bottom of the blowout prevention buffer device. A gas-liquid separator is connected to the negative pressure extraction device, and the gas-liquid separator is located close to the blowout prevention buffer device.

[0005] The invention is further characterized by:

[0006] The blowout preventer includes a buffer airbag, with a pressure relief pipe running through the middle of the buffer airbag. A slag discharge device and a negative pressure extraction device are connected to opposite sides of the buffer airbag, and a gas-liquid separator is installed near the outer wall of the buffer airbag.

[0007] The pressure relief pipe includes a bottom pipe with an arc-shaped cross-section, and two side pipes are hinged to each side of the bottom pipe, with the cross-sections of both side pipes also being arc-shaped.

[0008] The buffer airbag includes an airbag body, an airbag frame connected inside the airbag body, an air outlet at the top of the airbag frame, a slot on the side of the airbag frame opposite to the air outlet, the air outlet being connected to a negative pressure extraction device, and the bottom of the airbag frame being connected to a slag discharge device.

[0009] The negative pressure extraction device includes several extraction pipes arranged side by side. Each extraction pipe is connected to a valve. The valve is connected to a gas-water separator by bolts. The end of the gas-water separator away from the valve is connected to the air outlet. A negative pressure plate is installed in the slot. The negative pressure plate is connected to the inner wall of the airbag body by a steel rope. The negative pressure plate has a round hole on its surface. The round hole is the same size as the air outlet.

[0010] The gas-water separator includes a separation pipe, the top end of which is connected to a valve, the bottom end of which is set as an opening, a partition mesh connected to the top end of which is connected to the bottom end of which is connected to the gas outlet, and several partition plates fixed along the length of the inner wall of the separation pipe, with each partition plate being inclined.

[0011] The slag discharge device includes a slag discharge cylinder and a water discharge plate. The top of the slag discharge cylinder is connected to the airbag frame, the bottom side of the slag discharge cylinder is hinged to one side of the top of the water discharge plate, and the other side of the top of the water discharge plate is engaged with the inner wall of the slag discharge cylinder by a spring column.

[0012] The beneficial effects of this invention are:

[0013] This invention relates to a stepped extraction borehole buffer device. Through pressure relief pipes and buffer airbags, stepped pressure relief is achieved, effectively reducing the operating speed of the ejected gas and buffering the expansion pressure of accumulated gas. At the same time, the negative pressure extraction device and the buffer airbag are mechanically linked, and by adjusting the extraction negative pressure, as much ejected gas as possible is extracted. The gas-water separator effectively separates gas, water, and slag, and the slag discharge device promptly removes the solid-liquid mixture to avoid clogging the pipeline and affecting the use of the borehole buffer device. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of the stepped extraction borehole spray buffer device of the present invention;

[0015] Figure 2 This is a schematic diagram of the open state of the stepped extraction borehole spray buffer device of the present invention;

[0016] Figure 3 This is a cross-sectional view of the pressure relief pipe (open state) in the stepped extraction borehole spray buffer device of the present invention.

[0017] Figure 4 This is a cross-sectional view of the buffer airbag in the stepped extraction borehole spray buffer device of the present invention.

[0018] Figure 5 This is a schematic diagram of the negative pressure extraction device in the stepped extraction borehole and jet buffer device of the present invention.

[0019] Figure 6 This is a schematic diagram of the gas-water separator in the stepped extraction borehole spray buffer device of the present invention.

[0020] Figure 7 This is a schematic diagram of the slag discharge device in the stepped extraction borehole spray buffer device of the present invention.

[0021] In the diagram: 1. Blowout buffer device, 2. Negative pressure extraction device, 3. Slag discharge device, 4. Pressure relief pipe, 41. Bottom pipe, 42. Side pipe, 5. Buffer airbag, 51. Airbag frame, 52. Slot, 6. Valve, 7. Negative pressure plate, 8. Extraction pipe, 9. Gas-water separator, 91. Separation pipe, 92. Separating net, 93. Separating plate, 10. Slag discharge cylinder, 11. Water discharge plate, 12. Spring column. Detailed Implementation

[0022] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0023] Stepped extraction borehole spray buffer device, such as Figure 1-2 As shown, the system includes a blowout preventer buffer device 1, a negative pressure extraction device 2 connected to the top of the blowout preventer buffer device 1, and a slag discharge device 3 connected to the bottom of the blowout preventer buffer device 1. The negative pressure extraction device 2 is connected to a gas-liquid separator 9, which is positioned close to the blowout preventer buffer device 1. During normal operation, the blowout preventer buffer device 1 is in a folded state. When a blowout occurs in the borehole, the pressure relief pipe 4 and the buffer airbag 5 in the blowout preventer buffer device 1 release pressure in a stepped manner, reducing the speed of the ejected gas and buffering the expansion pressure of the accumulated gas. The negative pressure extraction device 2 draws in a large amount of overflowing gas from the blowout preventer buffer device 1, reducing the gas pressure in the ventilation system. During the suction process, the gas-liquid separator 9 separates the mixture ejected from the borehole. The solid-liquid mixture is blocked and falls into the slag discharge device under gravity for discharge.

[0024] like Figure 3 As shown, the pressure relief pipe 4 includes a bottom pipe 41 with an arc-shaped cross-section. Two side pipes 42 are hinged to both sides of the bottom pipe 41, and both side pipes 42 have arc-shaped cross-sections. The two side pipes 42 and the bottom pipe 41 form a complete cylindrical pipe.

[0025] The blowout prevention buffer device 1 includes a buffer airbag 5, a pressure relief pipe 4 passing through the middle of the buffer airbag 5, a slag discharge device 3 and a negative pressure extraction device 2 connected to opposite sides of the buffer airbag 5, and a gas-water separator 9 set near the outer wall of the buffer airbag 5.

[0026] Under normal circumstances, the water-slag mixture in the extraction pipeline flows out through the middle of the pressure relief pipe 4. When a blowout occurs, the high-pressure gas blows open the two side pipes 42, and the pressure relief pipe 4 performs initial pressure relief on the blowout. Then, the buffer airbag 5 expands and opens under the action of high-pressure gas to complete the secondary pressure relief.

[0027] like Figure 4-5As shown, the buffer airbag 5 includes an airbag body, an airbag frame 51 connected inside the airbag body, a pressure relief pipe 4 passing through the middle of the airbag frame 51, an air outlet at the top of the airbag frame 51, a slot 52 on the side of the airbag frame 51 opposite to the air outlet, the air outlet being connected to the negative pressure extraction device 2, and the bottom of the airbag frame 51 being connected to the slag discharge device 3.

[0028] The negative pressure extraction device 2 includes several extraction pipes 8 arranged side by side. Each extraction pipe 8 is connected to a valve 6. The valve 6 is connected to a gas-water separator 9 by bolts. The end of the gas-water separator 9 away from the valve 6 is connected to the air outlet. A negative pressure plate 7 is provided in the slot 52. The negative pressure plate 7 is connected to the inner wall of the airbag body by a steel rope. The negative pressure plate 7 has a round hole on its surface. The round hole is the same size as the air outlet.

[0029] Under normal conditions, the airbag body is compressed, and the circular hole on the negative pressure plate 7 intersects with the air outlet. By controlling the air outlet area, the extraction negative pressure is adjusted. When a gas leak occurs, the high-pressure gas causes the airbag body to expand, and the negative pressure plate 7 moves via the steel wire rope. The circular hole on the negative pressure plate 7 completely overlaps with the air outlet at the top of the airbag frame 51, and the extraction negative pressure quickly reaches its maximum. The gas is drawn into the extraction pipe 8, reducing the gas pressure in the ventilation system. Valve 6 is normally open. When the device needs maintenance, the valve is closed to ensure the airtightness of the extraction system.

[0030] like Figure 6 As shown, the gas-water separator 9 includes a separation pipe 91. The top end of the separation pipe 91 is connected to the valve 6, and the bottom end of the separation pipe 91 is open. A separator mesh 92 is connected to the top end of the separation pipe 91, and the bottom end of the separation pipe 91 is connected to the gas outlet. Several separator plates 93 are fixed along the length of the inner walls of the separation pipe 91, and each separator plate 93 is inclined. When a gas eruption occurs, the extraction negative pressure draws the gas-water-slag mixture out from the gas outlet at the top of the gas bag frame 51. The separator plates 93 and separator mesh 92 inside the separation pipe 91 block the water and slag, thus achieving gas-water separation.

[0031] like Figure 7 As shown, the slag discharge device 3 includes a slag discharge cylinder 10 and a water discharge plate 11. The top of the slag discharge cylinder 10 is connected to the airbag frame 51, and the bottom side of the slag discharge cylinder 10 is hinged to one side of the top of the water discharge plate 11. The other side of the top of the water discharge plate 11 is engaged with the inner wall of the slag discharge cylinder 10 through a spring column 12. The water discharge plate 11 and the slag discharge cylinder 10 form a barrel-shaped container. Under normal conditions, the spring column 12 is in contact with the inner wall of the slag discharge cylinder 10. When the separated solid-liquid mixture falls into the slag discharge cylinder 10 under the action of gravity, when a certain amount of mixture accumulates, the water discharge plate 11 is forced open under the action of gravity to drain and discharge slag.

[0032] The working principle of the stepped extraction borehole spray buffer device of the present invention is as follows:

[0033] When the blowout occurs, the high-pressure gas blasts open the two side pipes 42, and the pressure relief pipe 4 initially relieves the pressure on the blowout. Then, the buffer airbag 5 expands and opens under pressure, relieving the pressure on the blowout a second time. At the same time, the airbag body drives the negative pressure plate 7 to slide through the steel wire rope. The round hole on the negative pressure plate 7 completely overlaps with the air outlet at the top of the airbag frame 51, and the extraction negative pressure quickly reaches the maximum. The gas is sucked into the extraction pipe 8, reducing the gas pressure during ventilation. During the extraction process, the gas first passes through the separation pipe 91. The solid-liquid mixture is blocked by the separator plate 93 and the separator net 92 to ensure that there is no water accumulation in the extraction pipe 8. The separated solid-liquid mixture falls into the slag discharge cylinder 10 under the action of gravity. When a certain amount of mixture accumulates, the water discharge plate 11 is blasted under the action of gravity to drain and discharge slag.

[0034] Through the above methods, the stepped extraction borehole blowout buffer device of the present invention has the characteristics of self-excitation start-up, stepped buffer, self-adjusting negative pressure, gravity self-discharge of slag, safety and reliability, etc., which makes up for the shortcomings of existing borehole gas blowout treatment devices, such as being large and bulky and having poor prevention and control effects, and can be widely used in the field of coal mine gas control.

Claims

1. A stepped extraction borehole spray buffer device, characterized in that, Includes a blowout preventer (1), the top of which is connected to a negative pressure extraction device (2), the bottom of which is connected to a slag discharge device (3), the negative pressure extraction device (2) is connected to a gas-water separator (9), and the gas-water separator (9) is located close to the blowout preventer (1). The anti-blowout buffer device (1) includes a buffer airbag (5), a pressure relief pipe (4) is provided in the middle of the buffer airbag (5), and a slag discharge device (3) and a negative pressure extraction device (2) are respectively connected to the opposite sides of the buffer airbag (5). The gas-water separator (9) is set close to the outer wall of the buffer airbag (5). The buffer airbag (5) includes an airbag body, an airbag frame (51) is connected inside the airbag body, a pressure relief tube (4) passes through the middle of the airbag frame (51), an air outlet is opened at the top of the airbag frame (51), a slot (52) is opened on the side of the airbag frame (51) opposite to the air outlet, the air outlet is connected to the negative pressure extraction device (2), and the bottom of the airbag frame (51) is connected to the slag discharge device (3). The negative pressure extraction device (2) includes several extraction pipes (8) arranged side by side. Each extraction pipe (8) is connected to a valve (6). The valve (6) is connected to a gas-water separator (9) by bolts. The end of the gas-water separator (9) away from the valve (6) is connected to the air outlet. A negative pressure plate (7) is provided in the slot (52). The negative pressure plate (7) is connected to the inner wall of the airbag body by steel rope. A round hole is opened on the plate surface of the negative pressure plate (7). The round hole is the same size as the air outlet. The gas-water separator (9) includes a separation pipe (91), the top end of which is connected to a valve (6), the bottom end of which is set as an opening, a partition net (92) is connected to the top end of which is connected to the bottom end of which is connected to the air outlet, and a number of partition plates (93) are fixedly connected to the inner walls of the separation pipe (91) along its length, and each partition plate (93) is inclined. The slag discharge device (3) includes a slag discharge cylinder (10) and a water discharge plate (11). The top of the slag discharge cylinder (10) is connected to the airbag frame (51). The bottom side of the slag discharge cylinder (10) is hinged to one side of the top of the water discharge plate (11). The other side of the top of the water discharge plate (11) is engaged with the inner wall of the slag discharge cylinder (10) through a spring column (12). The pressure relief pipe (4) includes a bottom pipe (41), the cross-section of which is arc-shaped, and two side pipes (42) are respectively hinged to the two sides of the bottom pipe (41), and the cross-sections of the two side pipes (42) are both arc-shaped.

Images