A totally enclosed water sealed blowout preventer

Abstract

The application discloses a full-closed water seal type blowout prevention hole device, relates to the technical field of full-closed water seal type blowout prevention hole, and comprises a drilling machine, one end of the drilling machine is connected with a hole three-proofing device, and the other end of the hole three-proofing device is sleeved with a sleeve pipe. In the application, a flow resistance disc is welded in the hole three-proofing device, sealing pads can be fixed on the flow resistance disc, and a gap is left between the flow resistance disc and an outer cover plate to install two other sealing pads, so that zero gap between the drill pipe and the sealing pads and zero gap between the sealing pads and the hole three-proofing device are achieved, and the full-closed property of the hole three-proofing device is realized. The water level height control of the horizontal blowout prevention tank is relatively difficult in the use process, and deposited coal cinder is easy to block the water outlet pipe, so a water diversion pipe device is added to the inner side of the horizontal blowout prevention tank. The water diversion pipe device can change the water diversion intensity by controlling the size of the water pipe valve switch, so that the water level in the vertical blowout prevention tank is stabilized, and the water seal effect is realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of full-closed water seal blowout preventer, in particular to a full-closed water seal blowout preventer. BACKGROUND

[0002] With the increasing of coal mining depth, the management of gas disaster is becoming more and more difficult. In the process of drilling through the layer and along the layer in the coal mine, in order to prevent a large amount of gas from being sprayed out of the drilling hole to cause gas overrun and even gas explosion, a blowout preventer is used between the hole and the main pipe of the drainage pipe. The use of the blowout preventer can prevent a large amount of gas from being sprayed out of the drilling hole, avoid gas overrun and explosion accidents.

[0003] The defects of the existing blowout preventer in preventing blowout are as follows: (1) the slag outlet of the blowout preventer is directly connected with the atmosphere, when a large amount of gas is sprayed, due to the limited space in the blowout preventer, if the drainage capacity is less than the blowout strength, it will cause serious gas overrun and explosion accidents; (2) the hole three-proofing (dust-proof, gas-proof and blowout-proof, the same below) device in the existing blowout preventer is made of iron material, during the construction process, the iron drill rod is in a rotating state, and there is a gap between the hole three-proofing device and the iron drill rod, the water slag, air, gas and dust generated during the drilling process can easily overflow from the gap, which is not convenient for the on-site civilized and sanitary management, and cannot prevent the gas in the drilling hole from overflowing from the gap when the gas is sprayed, and can only reduce the strength of the gas overrun in a limited way. SUMMARY

[0004] The purpose of the present application is to solve the defects of the prior art, and a full-closed water seal blowout preventer is provided.

[0005] In order to achieve the above purpose, the present application adopts the following technical scheme:

[0006] A full-closed water seal blowout preventer, comprising:

[0007] The utility model relates to a drilling rig, one end of the drilling rig is connected with a borehole three-proof device, and the other end of the borehole three-proof device is sleeved with a sleeve pipe, one side of the outer wall of the borehole three-proof device is connected with a first corrugated steel pipe, and the other side of the outer wall of the borehole three-proof device is connected with a first connecting hose, the other end flange of the first corrugated steel pipe is connected with a vertical gas-water separation device, the top of the vertical gas-water separation device is connected with a transparent connecting hose, the other end flange of the transparent connecting hose is connected with a horizontal blowout preventer, the outer wall of the transparent connecting hose is connected with the other end of the first connecting hose, the top of the horizontal blowout preventer is connected with a second corrugated steel pipe through the transparent connecting hose, one side of the outer wall of the vertical gas-water separation device is mounted with a second connecting hose, and the tail end of the second connecting hose is connected with a metering coal pool, the other end of the drilling rig is connected with an operation platform, and the input end of the operation platform is mounted with a pumping hose, the other end of the pumping hose is connected with the vertical gas-water separation device, the access end of the operation platform is connected with a wind supply pipeline through a pipeline, and the access end of the operation platform is connected with a second water supply pipeline through a pipeline, the access end of the borehole three-proof device is mounted with a first water supply pipeline through a pipeline, and the first water supply pipeline is connected with the vertical gas-water separation device through a pipeline.

[0008] Preferably, the inner cavity of the borehole three-proof device is provided with a flow resistance disc, an inner side is provided with a sealing gasket, and an outer side is provided with two sealing gaskets.

[0009] Preferably, the transparent connecting hose and the horizontal blowout preventer are connected in a U shape, and the highest point of the transparent connecting hose is hung on the roadway roof.

[0010] Preferably, the lower water outlet of the vertical gas-water separation device is directly connected with a water supply pipe.

[0011] Preferably, the bottom of the horizontal blowout preventer is provided with a water drain elbow.

[0012] Technical application of a fully-closed water-sealed blowout prevention hole device, including drilling construction, punching operation and hole sealing operation, the specific steps of the drilling construction are:

[0013] Step one: using the drill bit of the drilling rig to construct, constructing to the coal point, using the hydraulic deslagging process drilling during, opening the air-water pumping conversion tee before changing the drill rod, using pumping to quickly pump the water in the drill rod into the vertical gas-water separation device;

[0014] Step two: after seeing coal, drilling by using the air deslagging process, opening the air-water pumping conversion tee before changing the drill rod, using pumping to pump the drill rod air to the vertical gas-water separation device;

[0015] Step three: after stopping coal, continue to use the air deslagging drilling for at least 0.5m or more;

[0016] Step four: report to the video monitoring center, hold the card and drill, take out all the drill pipes in the borehole, replace the drill bit with a diameter of 94mm, and install a puncher behind the drill bit;

[0017] Step five: after replacing the drill bit, the drill pipe is connected to the coal point 5m in front of the coal point, the drill pipe is replaced with a round drill pipe, and the sealing pad in the hole three-proofing device is replaced with a round hole type sealing pad.

[0018] Preferably, the specific steps of the punching operation are:

[0019] Step one: check the three sealing pads again before punching, and replace them in time if they are not sealed well;

[0020] Step two: connect the drill pipe to the coal point, from top to bottom, use static pressure wind to expand the hole, if the coal output per hour is less than 0.5 tons, stop expanding the hole;

[0021] Step three: connect the drill pipe to the coal point again, from top to bottom, replace it with air compressor air expansion, if the coal output per hour is less than 0.5 tons, stop expanding the hole;

[0022] Step four: retreat the drill pipe to 1-2m below the coal point, use static pressure water to wash the hole, and after the hole returns to clean water, proceed to uniformly pressurize the hydraulic expansion from the coal point to the coal point from bottom to top, if the coal output per hour is less than 1 ton, stop expanding the hole;

[0023] Step five: retreat the drill pipe to 1-2m below the coal point, use emulsion pump to supply water, and the pressure should not exceed 15MPa, expand the hole until the expanded coal reaches the required standard;

[0024] Step six: during the punching period, determine whether the pumping pipeline is blocked or unblocked through the water level of the vertical gas-water separation device and the water level of the horizontal blowout prevention tank, and the high water level is 10-50cm;

[0025] Step seven: during the punching period, observe the punching coal size, whether the deslagging is smooth, and whether the pipeline is blocked through the water level observation device and observation window of the vertical gas-water separation device at any time, and stop the operation immediately for treatment if any abnormality is found.

[0026] Preferably, the specific steps of the sealing operation are:

[0027] Step one: the sealing bag or air bag is 2-3m away from the coal point, a 2m solid pipe is installed in front of the sealing bag or air bag, and the sealing bag or air bag inflation (grouting) pipe extends to 0.5-1m outside the hole for inflation (grouting);

[0028] Step two: the screen pipe is lowered to the whole coal seam section, if the screen pipe cannot be lowered to the whole section due to hole collapse, the screen pipe is at least lowered to the hole once, if the screen pipe still cannot be lowered to the whole section after the hole is lowered once, the screen pipe is ensured to enter the coal-rock boundary line by at least 4m, if the coal length is less than 5m, the screen pipe is sealed and enters the coal seam by not less than 2m;

[0029] Step three: a pipe column with a diameter of 50mm (grouting type B column) is fixed at a position 2m away from the hole, the black 16mm diameter bag grouting pipe and the white 16mm diameter rock section grouting pipe are connected by a quick connector;

[0030] Step four: the hole is strictly prohibited from being exposed before sealing, the hole is wrapped with a wind pipe to seal the hole, if the hole is not sealed to the designed position due to hole collapse or other conditions, the sealing pipe is immediately withdrawn to perform hole cleaning operation.

[0031] In summary, due to the adoption of the above technical scheme, the present application has the following beneficial effects:

[0032] 1、In the present application, a flow resistance disc is welded in the hole three-proofing device, the flow resistance disc can fix a sealing gasket, a gap is left between the flow resistance disc and the outer cover plate to install two other sealing gaskets, so as to realize zero gap between the drill pipe and the sealing gasket and zero gap between the sealing gasket and the hole three-proofing device, thereby realizing the full sealing of the hole three-proofing device; the water level height control of the horizontal blowout preventer is relatively difficult in the use process, and the deposited coal slag is easy to block the water outlet pipe, so a drainage water pipe device is added to the inner side, which can change the drainage intensity by controlling the size of the water pipe valve opening and closing, thereby realizing the stability of the water level in the vertical blowout preventer and realizing the water sealing effect; a one-way anti-reverse air valve is added above the hole three-proofing device to reduce the fluctuation of the drainage negative pressure, further ensure the stability of the water level in the vertical blowout preventer, and prevent gas backflow when the hole is jetted, and when the one-way anti-reverse air valve is closed due to jetting, the driver of the drilling machine can be reminded to take measures in time. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 The present application is a whole structure schematic diagram.

[0034] Legend:

[0035] 1, drilling machine; 2, casing; 3, hole three-proofing device; 4, first corrugated steel pipe; 5, first connecting hose; 6, vertical gas-water separation device; 7, transparent connecting hose; 8, second connecting hose; 9, horizontal blowout preventer; 10, metering coal pool; 11, second corrugated steel pipe; 12, drainage hose; 13, first water supply pipeline; 14, air supply pipeline; 15, second water supply pipeline; 16, operation table. DETAILED DESCRIPTION

[0036] Clearly, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts are within the scope of the present application.

[0037] Referring to Figure 1 A fully-closed water-sealed blowout prevention hole device, comprising a drilling machine 1, one end of the drilling machine 1 is connected with a blowout prevention device 3, and the other end of the blowout prevention device 3 is sleeved with a casing 2, one side of the outer wall of the blowout prevention device 3 is connected with a first corrugated steel pipe 4, and the other side of the outer wall of the blowout prevention device 3 is connected with a first connecting hose 5, the other end of the first corrugated steel pipe 4 is flange-connected with a vertical gas-water separation device 6, and the top of the vertical gas-water separation device 6 is connected with a transparent connecting hose 7, the other end of the transparent connecting hose 7 is flange-connected with a horizontal blowout prevention tank 9, and the outer wall of the transparent connecting hose 7 is connected with the other end of the first connecting hose 5, the top of the horizontal blowout prevention tank 9 is connected with a second corrugated steel pipe 11 through the transparent connecting hose 7, one side of the outer wall of the vertical gas-water separation device 6 is installed with a second connecting hose 8, and the tail end of the second connecting hose 8 is connected with a metering coal pool 10, the other end of the drilling machine 1 is connected with an operation table 16, and the input end of the operation table 16 is installed with a pumping hose 12, the other end of the pumping hose 12 is connected with the vertical gas-water separation device 6, the access end of the operation table 16 is connected with an air supply pipeline 14 through a pipeline, and the access end of the operation table 16 is connected with a second water supply pipeline 15 through a pipeline, the access end of the blowout prevention device 3 is installed with a first water supply pipeline 13 through a pipeline, and the first water supply pipeline 13 is connected with the vertical gas-water separation device 6 through a pipeline.

[0038] The inner cavity of the blowout prevention device 3 is provided with a flow blocking disc, the inner side is provided with a sealing gasket, and the outer side is provided with two sealing gaskets, a gap is left between the flow blocking disc and the outer side cover plate to install the other two sealing gaskets, so as to achieve zero gap between the drill pipe and the sealing gasket, zero gap between the sealing gasket and the blowout prevention device 3, and thus realize the full sealing of the blowout prevention device 3.

[0039] The transparent connecting hose 7 and the horizontal blowout prevention tank 9 are connected in a U shape, and the highest point of the transparent connecting hose 7 is hung on the roof of the roadway, thereby playing a role in gas-water separation, and the transparent material is convenient for observing the water flow passing condition.

[0040] The water outlet opposite to the lower part of the vertical gas-water separation device 6 is directly connected with a water supply pipe, and the water pipe is always open during the drilling construction process, effectively preventing the outflow from being blocked by accumulated slag.

[0041] The bottom of the horizontal blowout prevention tank 9 is provided with a water discharge elbow, and two valves are matched to perform water discharge work on the horizontal blowout prevention tank 9.

[0042] The technical application of a fully-closed water-sealed blowout prevention hole device includes drilling construction, punching operation and hole sealing operation, and the specific steps of the drilling construction are as follows:

[0043] Step one: drilling construction is performed using the drill bit of the drilling machine 1 until the coal point is reached, during which the water power deslagging process is used, the air-water pumping conversion tee is opened before the drill rod is replaced, and the water in the drill rod is quickly pumped into the vertical gas-water separation device 6 by pumping;

[0044] Step two: after the coal is reached, the air power deslagging process is used for drilling, the air-water pumping conversion tee is opened before the drill rod is replaced, and the compressed air in the drill rod is pumped into the vertical gas-water separation device 6 by pumping;

[0045] Step three: after the coal is stopped, the air power deslagging process is used for drilling for at least 0.5 m or more;

[0046] Step four: after reporting to the video monitoring center, the drilling is raised by holding the card, all the drill rods in the drilling hole are pulled out, the drill bit with a diameter of 94 mm is replaced, and the punching device is installed behind the drill bit;

[0047] Step five: after replacing the drill bit, the drill rod is moved to a position 5 m before the coal point, the drill rod is replaced with a round drill rod, and the sealing gasket in the hole three-proofing device 3 is replaced with a round hole type sealing gasket.

[0048] The specific steps of the punching operation are as follows:

[0049] Step one: the three sealing gaskets are checked again before punching, and the poor sealing gaskets are replaced in time;

[0050] Step two: the drill rod is moved to the coal stopping point, and the hole is expanded using static pressure air from top to bottom, and if the coal output per hour is less than 0.5 tons, the expansion is stopped;

[0051] Step three: the drill rod is moved to the coal stopping point again, and the hole is expanded using air pressure from top to bottom, and if the coal output per hour is less than 0.5 tons, the expansion is stopped;

[0052] Step four: the drill rod is moved to 1-2 m below the coal point, and the hole is washed using static pressure water, and after the hole returns to clean water, the uniform pressure hydraulic coal expansion is performed from the coal point to the coal stopping point from bottom to top, and if the coal output per hour is less than 1 ton, the expansion is stopped;

[0053] Step five: the drill rod is moved to 1-2 m below the coal point again, and the hole is expanded using the emulsifying pump, and the pressure should not exceed 15 MPa, until the coal expansion reaches the required standard;

[0054] Step six: during the punching, whether the pumping pipeline is blocked or unblocked is determined by the water level of the vertical gas-water separation device 6 and the water level of the horizontal blowout prevention tank 9, and the high water level is 10-50 cm.

[0055] Step seven: observe the size of the punching coal, whether the slag is smooth, and whether the pipeline is blocked at any time during the punching by the water level observation device and observation window on the vertical gas-water separation device 6, and stop the operation immediately for processing if any abnormality is found.

[0056] The specific steps of the hole sealing operation are:

[0057] Step one: the hole sealing bag or air bag is 2-3 m away from the coal point, a 2 m solid pipe is installed in front of the hole sealing bag or air bag, and the hole sealing bag or air bag inflation (grouting) pipe extends to 0.5-1 m outside the hole to facilitate inflation (grouting);

[0058] Step two: the screen pipe is lowered throughout the coal seam section, if the hole cannot be fully screened due to hole collapse, at least once along the hole, if the hole cannot be fully screened after following the hole, ensure that the screen pipe enters the coal-rock boundary line at least 4 m inside, if the coal length is less than 5 m, the sealing screen pipe enters the coal seam not less than 2 m;

[0059] Step three: a 50 mm diameter pipe column (grouting type B column) is fixed at a position 2 m away from the hole, the 16 mm diameter bag grouting pipe is black, the 16 mm diameter rock section grouting pipe is white, and both are connected by a quick connector with 1-2 m external leakage;

[0060] Step four: do not remove the hole three-way valve and negative pressure continuous pumping pipeline before sealing the hole; the hole is not allowed to be exposed before the sealing pipe is lowered, and a wind pipe can be used to wrap and seal the hole, if the hole is not sealed to the designed position due to hole collapse or other conditions, the sealing pipe is immediately withdrawn for hole cleaning operation.

[0061] Working principle: when in use, first, the drill bit of the drilling machine 1 is used for construction, and the construction is performed to the coal point, during which the water power slag removal process is used for drilling, the air-water pumping conversion three-way valve is opened before the drill rod is replaced, and the water in the drill rod is quickly pumped into the vertical gas-water separation device 6 by pumping; after the coal is found, the air power slag removal process is used for drilling, the air-water pumping conversion three-way valve is opened before the drill rod is replaced, and the air in the drill rod is pumped into the vertical gas-water separation device 6 by pumping; after the coal is stopped, the air power slag removal drilling is continued for at least 0.5 m or more; after reporting to the video monitoring center, the drilling is stopped, all the drill rods in the hole are pulled out, the drill bit with a diameter of 94 mm is replaced, and a hole puncher is installed behind the drill bit.

[0062] The specific steps of the punching operation are as follows: rechecking the three sealing pads before punching, replacing the sealing pad in time if the sealing is not good; the drill rod is connected to the coal stopping point, and the hole is expanded from top to bottom by using static pressure wind, and if the coal output per hour is less than 0.5 tons, the expansion is stopped; the drill rod is connected to the coal stopping point again, and the hole is expanded by replacing the air compressor with air expansion, and if the coal output per hour is less than 0.5 tons, the expansion is stopped; the drill rod is retracted to 1-2m below the coal point, and the hole is washed by using static pressure water, and after the hole returns to clear water, the uniform pressure water is expanded from the coal point to the coal stopping point from bottom to top at a constant speed, and if the coal output per hour is less than 1 ton, the expansion is stopped; the drill rod is retracted to 1-2m below the coal point, and the hole is expanded by using the emulsion pump to supply water, and the pressure should not exceed 15MPa, and the expansion is continued until the coal output reaches the required standard; during the punching, whether the pumping pipeline is blocked or not is judged by the height of the water level meter on the vertical gas-water separation device 6 and the horizontal blowout prevention box 9, and the high position of the water level meter is 10-50cm; during the punching, the coal output, whether the slag discharge is smooth, and whether the pipeline is blocked are observed at any time by the water level observation device and the observation window on the vertical gas-water separation device 6, and the operation is stopped immediately for treatment if any abnormality is found.

[0063] The specific steps of the hole sealing operation are as follows: the sealing bag or air bag is 2-3m away from the coal point, a 2m solid pipe is installed in front of the sealing bag or air bag, and the sealing bag or air bag inflation (grouting) pipe extends to 0.5-1m outside the hole to facilitate inflation (grouting); the screen pipe is lowered throughout the coal seam section, and if the hole collapse causes the screen pipe to be unable to be lowered throughout, the screen pipe is at least connected to the hole once; if the screen pipe still cannot be lowered throughout after being connected to the hole, the screen pipe is ensured to enter the coal-rock boundary line at least 4m from the inside; if the coal length is less than 5m, the sealing screen pipe enters the coal seam by not less than 2m; the 50mm diameter pipe column (grouting type B column) is fixed at a position 2m away from the hole, the 16mm diameter bag grouting pipe is black, the 16mm diameter rock section grouting pipe is white, and they are all connected by using a quick connector with 1-2m external leakage; the hole sealing is strictly prohibited before the hole sealing pipe is lowered, and the hole sealing pipe is strictly prohibited to be exposed, and the hole can be wrapped and sealed by using a wind cylinder, and if the hole is not sealed to the designed position due to hole collapse or other conditions, the hole sealing pipe is immediately withdrawn for hole cleaning operation.

[0064] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can make equivalent replacement or change within the technical range disclosed by the present application according to the technical solution and inventive concept of the present application, which should be covered within the protection scope of the present application.

Claims

1. A fully enclosed water sealed blowout prevention device, comprising: a drilling machine (1), characterized in that one end of the drilling machine (1) is connected with a blowout prevention device (3), and the other end of the blowout prevention device (3) is sleeved with a casing (2), one side of the outer wall of the blowout prevention device (3) is connected with a first corrugated steel pipe (4), and the other side of the outer wall of the blowout prevention device (3) is connected with a first connecting hose (5), the other end of the first corrugated steel pipe (4) is flange connected with a vertical gas-water separation device (6), the top of the vertical gas-water separation device (6) is connected with a transparent connecting hose (7), the other end of the transparent connecting hose (7) is flange connected with a horizontal blowout prevention tank (9), and the outer wall of the transparent connecting hose (7) is connected with the other end of the first connecting hose (5), the top of the horizontal blowout prevention tank (9) is connected with a second corrugated steel pipe (11) through the transparent connecting hose (7), one side of the outer wall of the vertical gas-water separation device (6) is installed with a second connecting hose (8), and the end of the second connecting hose (8) is connected with a metering coal pool (10), the other end of the drilling machine (1) is connected with an operation table (16), and the input end of the operation table (16) is installed with a drainage hose (12), the other end of the drainage hose (12) is connected with the vertical gas-water separation device (6), the access end of the operation table (16) is connected with an air supply pipeline (14) through a pipeline, and the access end of the operation table (16) is connected with a second water supply pipeline (15) through a pipeline, the access end of the blowout prevention device (3) is installed with a first water supply pipeline (13) through a pipeline, and the first water supply pipeline (13) is connected with the vertical gas-water separation device (6) through a pipeline, the inner cavity of the blowout prevention device (3) is provided with one flow resistance disc, one sealing gasket is arranged on the inner side, and two sealing gaskets are arranged on the outer side; the transparent connecting hose (7) and the horizontal blowout prevention tank (9) are connected in a U shape, and the highest point of the transparent connecting hose (7) is hung on the roof of the roadway; the blowout prevention device (3) is connected with the water supply pipeline directly opposite the lower water outlet of the vertical gas-water separation device (6); the bottom of the horizontal blowout prevention tank (9) is provided with a water drainage elbow.

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