CN111894655B - Low-temperature fluid quick-freezing ice blocking method for gas extraction drill hole - Google Patents
Low-temperature fluid quick-freezing ice blocking method for gas extraction drill hole Download PDFInfo
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- CN111894655B CN111894655B CN202010584711.3A CN202010584711A CN111894655B CN 111894655 B CN111894655 B CN 111894655B CN 202010584711 A CN202010584711 A CN 202010584711A CN 111894655 B CN111894655 B CN 111894655B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F7/00—Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices, or the like
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Abstract
The invention discloses a low-temperature fluid quick-freezing ice blocking method for a gas extraction drill hole, which is characterized in that high-pressure water is injected into two water pressure capsule blocking devices through a water injection pipe, and the two water pressure capsule blocking devices are filled under the action of water pressure, so that a sealed space is formed by the first water pressure capsule blocking device, the second water pressure capsule blocking device and the inner wall of the gas extraction drill hole; then injecting low-temperature fluid into the sealed space, wherein the low-temperature fluid is heated in the sealed space and then partially changes phase to form phase-change gas, and the phase-change gas is discharged out of the sealed space from the exhaust pipe, so that the air pressure in the sealed space is ensured to be in a normal pressure state; meanwhile, after the two hydraulic capsule plugging devices are contacted with the low-temperature fluid, the temperature is quickly reduced, so that water in the hydraulic capsule plugging devices is changed into ice, the pressing force between the first hydraulic capsule plugging device and the inner wall of the gas extraction drill hole is further increased, and the sealing effect between the hydraulic capsule plugging devices and the inner wall of the gas extraction drill hole is ensured; and finishing the ice blocking and sealing process of the gas extraction drill hole.
Description
Technical Field
The invention relates to a low-temperature fluid quick-freezing ice blocking method for a gas extraction drill hole, and belongs to the technical field of gas extraction.
Background
At present, coal and gas outburst disasters still restrict the development of the coal industry in China and threaten the safety production of underground coal mines. In order to reduce the occurrence of coal and gas outburst disasters, gas extraction by using drill holes is one of important basic technical means. Therefore, the plugging degree of the drill hole directly determines the gas extraction effect, once the drill hole opening can not be plugged effectively, the gas in the drill hole can not be extracted through the extraction channel in the gas extraction process, so that the extracted gas is low in concentration, and the gas can enter a personnel working area from a gap which is not plugged at the drill hole opening, so that the personnel can have safety risks; in addition, according to statistics, the current about 2/3 mine gas extraction drilled hole sealing length is short and the sealing quality is poor, and about 65% of pre-extraction gas concentration of the stope face is lower than 30%. In addition, when the existing capsule plugging device is used for plugging, the drilled hole has air leakage, and the sealing quality needs to be further improved. Therefore, how to effectively seal the gas extraction drill hole and further effectively improve the extraction effect of the drill hole is the research direction of the industry.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides the low-temperature fluid quick-freezing ice plugging method for the gas extraction drill hole, which utilizes the principle that the volume of water phase is changed into ice to be increased, so that the gas extraction drill hole is effectively blocked and sealed by ice, and the gas extraction effect of the gas extraction drill hole is further effectively improved.
In order to achieve the purpose, the invention adopts the technical scheme that: a low-temperature fluid quick-freezing ice blocking method for a gas extraction drill hole comprises the following specific steps:
A. assembling a gas extraction sealing system: the method comprises the following steps that a gas extraction pipe is arranged, two hydraulic capsule plugging devices which are not filled are arranged on the gas extraction pipe and are respectively a first hydraulic capsule plugging device and a second hydraulic capsule plugging device, a certain distance is reserved between the first hydraulic capsule plugging device and the second hydraulic capsule plugging device, and the first hydraulic capsule plugging device is closer to the gas inlet end of the gas extraction pipe than the second hydraulic capsule plugging device; the water injection pipe is fixedly connected with the second water pressure capsule plugging device and the first water pressure capsule plugging device in sequence, the interior of the water injection pipe is respectively communicated with the water injection channels in the second water pressure capsule plugging device and the first water pressure capsule plugging device, and the water injection pipe and the gas extraction pipe are arranged in parallel; an exhaust pipe is arranged and fixed on the second hydraulic capsule plugging device, and one end of the exhaust pipe penetrates through the second hydraulic capsule plugging device and is positioned between the first hydraulic capsule plugging device and the second hydraulic capsule plugging device; arranging a low-temperature injection fluid pipe, wherein the low-temperature injection fluid pipe is fixed on the second hydraulic capsule plugging device, and one end of the low-temperature injection fluid pipe penetrates through the second hydraulic capsule plugging device to be positioned between the first hydraulic capsule plugging device and the second hydraulic capsule plugging device, so that the assembly of the gas extraction sealing system is completed;
B. placing a gas extraction sealing system into a required gas extraction drill hole, so that a gas inlet end of a gas extraction pipe extends into the deepest part of the gas extraction drill hole, and a first water pressure capsule plugging device and a second water pressure capsule plugging device are positioned in the gas extraction drill hole; the gas outlet end of the gas extraction pipe, the water inlet of the water injection pipe, the other end of the low-temperature water injection fluid pipe and the other end of the exhaust pipe are all positioned outside the gas extraction drill hole, so that the layout process of the gas extraction sealing system is completed;
C. when plugging is carried out, a water inlet of a water injection pipe is connected with a high-pressure water pump, high-pressure water is injected into a first water pressure capsule plugging device and a second water pressure capsule plugging device through the water injection pipe, the first water pressure capsule plugging device and the second water pressure capsule plugging device are inflated under the action of water pressure, are respectively pressed and sealed with the inner wall of the gas extraction drill hole and keep the current water pressure, and the water inlet of the water injection pipe is disconnected from the high-pressure water pump and is plugged, so that a sealed space is formed by the first water pressure capsule plugging device, the second water pressure capsule plugging device and the inner wall of the gas extraction drill hole;
D. the other end of the low-temperature fluid injection pipe is communicated with a low-temperature fluid pump, low-temperature fluid is injected into the sealed space at a certain pressure through the low-temperature fluid injection pipe, the phase of part of the low-temperature fluid is changed into phase-change gas after the low-temperature fluid is heated in the sealed space, and the phase-change gas is exhausted out of the sealed space from the stopper exhaust pipe, so that the pressure in the sealed space is ensured to be in a normal pressure state, and a reaction force cannot be; meanwhile, the temperature of the first hydraulic capsule plugging device and the second hydraulic capsule plugging device is rapidly reduced after the first hydraulic capsule plugging device and the second hydraulic capsule plugging device are contacted with the low-temperature fluid, so that the water in the first hydraulic capsule plugging device and the second hydraulic capsule plugging device is changed into ice, and the volume of the water is increased after the water phase is changed into ice, so that the pressing force between the first hydraulic capsule plugging device and the second hydraulic capsule plugging device and the inner wall of the gas extraction drill hole is further increased, and the sealing effect between the hydraulic capsule plugging device and the inner wall of the; after the operation lasts for a period of time, the other end of the low-temperature fluid injection pipe is disconnected from the low-temperature fluid pump and is plugged, the exhaust pipe keeps a pressure relief state, the situation that the phase change expansion pressure of the low-temperature fluid in the sealed space is too large to influence the plugging effect is avoided, the ice plugging and sealing process of the gas extraction drill hole is completed, the gas outlet end of the gas extraction pipe is connected with extraction equipment, and gas extraction is carried out on the gas extraction drill hole;
E. and D, repeating the steps C and D at intervals to prevent the blocking effect from being reduced due to the fact that the ice is melted by heating.
Further, the cryogenic fluid is one of liquid nitrogen, liquid carbon dioxide and liquid oxygen.
Furthermore, a plurality of air inlets are formed in the pipe wall close to the air inlet end of the gas extraction pipe.
Further, the first hydraulic capsule plugging device and the second hydraulic capsule plugging device are made of rubber.
Compared with the prior art, the gas extraction sealing system is formed by the gas extraction pipe, the water pressure capsule plugging devices, the water injection pipe, the low-temperature water injection pipe and the exhaust pipe, the gas extraction sealing system is placed in a gas extraction drill hole, high-pressure water is injected into the two water pressure capsule plugging devices through the water injection pipe, the two water pressure capsule plugging devices are filled under the action of water pressure, and a sealing space is formed by the first water pressure capsule plugging device, the second water pressure capsule plugging device and the inner wall of the gas extraction drill hole; then injecting low-temperature fluid into the sealed space through a low-temperature fluid injection pipe, wherein the low-temperature fluid is heated in the sealed space and then partially changes phase to form phase-change gas, and the phase-change gas is discharged out of the sealed space from the exhaust pipe, so that the air pressure in the sealed space is ensured to be in a normal pressure state; meanwhile, the temperature of the two water pressure capsule stoppers is rapidly reduced after the two water pressure capsule stoppers are contacted with the low-temperature fluid, so that the water in the water pressure capsule stoppers is changed into ice, and the volume of the water phase is increased after the water phase is changed into ice, so that the pressing force between the first water pressure capsule stopper and the second water pressure capsule stopper and the inner wall of the gas extraction drill hole is further increased, and the sealing effect between the water pressure capsule stopper and the inner wall of the gas extraction drill hole is ensured; and finishing the ice blocking and sealing process of the gas extraction drill hole, connecting the gas outlet end of the gas extraction pipe with extraction equipment, and starting to extract gas from the gas extraction drill hole. Therefore, the invention utilizes the principle that the volume of ice is increased when the water phase is changed into the ice, and the effective ice blocking and sealing are carried out on the gas extraction drill hole, thereby effectively improving the gas extraction effect of the gas extraction drill hole.
Drawings
FIG. 1 is a schematic view of the ice plug arrangement of the present invention.
In the figure: 1. the device comprises a water injection pipe, a gas exhaust pipe, a sealing space, a gas extraction pipe, a coal bed, a gas extraction drill hole, a first water pressure capsule plugging device, a second water pressure capsule plugging device and a low-temperature fluid injection pipe, wherein the gas extraction drill hole is 6, the first water pressure capsule plugging device is 7, and the second water pressure capsule plugging device is 9.
Detailed Description
The present invention will be further explained below.
As shown in fig. 1, the method comprises the following specific steps:
A. assembling a gas extraction sealing system: arranging a gas extraction pipe 4, wherein two unfilled water pressure capsule stoppers are arranged on the gas extraction pipe 4 and respectively comprise a first water pressure capsule stopper 7 and a second water pressure capsule stopper 8, a certain distance is arranged between the first water pressure capsule stopper 7 and the second water pressure capsule stopper 8, and the first water pressure capsule stopper 7 is closer to the gas inlet end of the gas extraction pipe 4 than the second water pressure capsule stopper 8; the water injection pipe 1 is fixedly connected with the second hydraulic capsule plugging device 8 and the first hydraulic capsule plugging device 7 in sequence, the interior of the water injection pipe 1 is respectively communicated with water injection channels in the second hydraulic capsule plugging device 8 and the first hydraulic capsule plugging device 7, and the water injection pipe 1 and the gas extraction pipe 4 are arranged in parallel; an exhaust pipe 2 is arranged, the exhaust pipe 2 is fixed on a second hydraulic capsule plugging device 8, and one end of the exhaust pipe passes through the second hydraulic capsule plugging device 8 and is positioned between a first hydraulic capsule plugging device 7 and the second hydraulic capsule plugging device 8; arranging a low-temperature injection fluid pipe 9, wherein the low-temperature injection fluid pipe 9 is fixed on the second hydraulic capsule plugging device 8, and one end of the low-temperature injection fluid pipe passes through the second hydraulic capsule plugging device 8 and is positioned between the first hydraulic capsule plugging device 7 and the second hydraulic capsule plugging device 8, so that the assembly of the gas extraction sealing system is completed;
B. firstly, placing a gas extraction sealing system into a required gas extraction borehole 6, so that the gas inlet end of a gas extraction pipe 4 extends into the deepest part of the gas extraction borehole 6, and a first water pressure capsule plugging device 7 and a second water pressure capsule plugging device 8 are positioned in the gas extraction borehole 6; the gas outlet end of the gas extraction pipe 4, the water inlet of the water injection pipe 1, the other end of the low-temperature fluid injection pipe 9 and the other end of the exhaust pipe 2 are all positioned outside the gas extraction drill hole 6, so that the layout process of the gas extraction sealing system is completed;
C. when plugging is carried out, a water inlet of a water injection pipe 1 is connected with a high-pressure water pump, high-pressure water is injected into a first water pressure capsule plugging device 7 and a second water pressure capsule plugging device 8 through the water injection pipe 1, the first water pressure capsule plugging device 7 and the second water pressure capsule plugging device 8 are both filled under the action of water pressure, and are respectively pressed and sealed with the inner wall of a gas extraction drill hole 6 and keep the current water pressure, the water inlet of the water injection pipe 1 is disconnected from the high-pressure water pump and is plugged, so that a sealed space 3 is formed by the inner walls of the first water pressure capsule plugging device 7, the second water pressure capsule plugging device 8 and the gas extraction drill hole 6;
D. the other end of the low-temperature fluid injection pipe 9 is communicated with a low-temperature fluid pump, low-temperature fluid is injected into the sealed space 3 at a certain pressure through the low-temperature fluid injection pipe 9, partial phase change of the low-temperature fluid after being heated in the sealed space 3 is carried out to form phase change gas, and the phase change gas is exhausted from the exhaust pipe 2 out of the sealed space 3, so that the air pressure in the sealed space 3 is ensured to be in a normal pressure state, and no reaction force is formed on the injection of; meanwhile, the temperature of the first hydraulic capsule plugging device 7 and the second hydraulic capsule plugging device 8 is rapidly reduced after the first hydraulic capsule plugging device and the second hydraulic capsule plugging device are contacted with the low-temperature fluid, so that the water in the first hydraulic capsule plugging device 7 and the second hydraulic capsule plugging device 8 is changed into ice, and the volume of the water is increased after the water is changed into ice, so that the pressing force between the first hydraulic capsule plugging device 7 and the second hydraulic capsule plugging device 8 and the inner wall of the gas extraction drill hole 6 is further increased, and the sealing effect between the hydraulic capsule plugging device and the inner wall of the gas; after the operation lasts for a period of time, the other end of the low-temperature fluid injection pipe 9 is disconnected from the low-temperature fluid pump and is plugged, the exhaust pipe 2 keeps a pressure relief state, the situation that the plugging effect is affected due to overlarge phase change expansion pressure of the low-temperature fluid in the sealed space 3 is avoided, the ice plugging and sealing process of the gas extraction drill hole 6 is completed, the gas outlet end of the gas extraction pipe 4 is connected with extraction equipment, and gas extraction is started to be carried out on the gas extraction drill hole 6;
E. and D, repeating the steps C and D at intervals to prevent the blocking effect from being reduced due to the fact that the ice is melted by heating.
Further, the cryogenic fluid is one of liquid nitrogen, liquid carbon dioxide and liquid oxygen.
Furthermore, a plurality of air inlets are formed in the pipe wall close to the air inlet end of the gas extraction pipe 4.
Further, the first hydraulic capsule plugging device 7 and the second hydraulic capsule plugging device 8 are made of rubber.
Claims (4)
1. A low-temperature fluid quick-freezing ice blocking method for a gas extraction drill hole is characterized by comprising the following specific steps:
A. assembling a gas extraction sealing system: the method comprises the following steps that a gas extraction pipe is arranged, two hydraulic capsule plugging devices which are not filled are arranged on the gas extraction pipe and are respectively a first hydraulic capsule plugging device and a second hydraulic capsule plugging device, a certain distance is reserved between the first hydraulic capsule plugging device and the second hydraulic capsule plugging device, and the first hydraulic capsule plugging device is closer to the gas inlet end of the gas extraction pipe than the second hydraulic capsule plugging device; the water injection pipe is fixedly connected with the second water pressure capsule plugging device and the first water pressure capsule plugging device in sequence, the interior of the water injection pipe is respectively communicated with the water injection channels in the second water pressure capsule plugging device and the first water pressure capsule plugging device, and the water injection pipe and the gas extraction pipe are arranged in parallel; an exhaust pipe is arranged and fixed on the second hydraulic capsule plugging device, and one end of the exhaust pipe penetrates through the second hydraulic capsule plugging device and is positioned between the first hydraulic capsule plugging device and the second hydraulic capsule plugging device; arranging a low-temperature injection fluid pipe, wherein the low-temperature injection fluid pipe is fixed on the second hydraulic capsule plugging device, and one end of the low-temperature injection fluid pipe penetrates through the second hydraulic capsule plugging device to be positioned between the first hydraulic capsule plugging device and the second hydraulic capsule plugging device, so that the assembly of the gas extraction sealing system is completed;
B. placing a gas extraction sealing system into a required gas extraction drill hole, so that a gas inlet end of a gas extraction pipe extends into the deepest part of the gas extraction drill hole, and a first water pressure capsule plugging device and a second water pressure capsule plugging device are positioned in the gas extraction drill hole; the gas outlet end of the gas extraction pipe, the water inlet of the water injection pipe, the other end of the low-temperature water injection fluid pipe and the other end of the exhaust pipe are all positioned outside the gas extraction drill hole, so that the layout process of the gas extraction sealing system is completed;
C. when plugging is carried out, a water inlet of a water injection pipe is connected with a high-pressure water pump, high-pressure water is injected into a first water pressure capsule plugging device and a second water pressure capsule plugging device through the water injection pipe, the first water pressure capsule plugging device and the second water pressure capsule plugging device are inflated under the action of water pressure, are respectively pressed and sealed with the inner wall of the gas extraction drill hole and keep the current water pressure, and the water inlet of the water injection pipe is disconnected from the high-pressure water pump and is plugged, so that a sealed space is formed by the first water pressure capsule plugging device, the second water pressure capsule plugging device and the inner wall of the gas extraction drill hole;
D. the other end of the low-temperature fluid injection pipe is communicated with a low-temperature fluid pump, low-temperature fluid is injected into the sealed space at a certain pressure through the low-temperature fluid injection pipe, the phase of part of the low-temperature fluid is changed into phase-change gas after the low-temperature fluid is heated in the sealed space, and the phase-change gas is exhausted out of the sealed space from the exhaust pipe, so that the pressure in the sealed space is ensured to be in a normal pressure state, and a reaction force cannot; meanwhile, the temperature of the first hydraulic capsule plugging device and the second hydraulic capsule plugging device is rapidly reduced after the first hydraulic capsule plugging device and the second hydraulic capsule plugging device are contacted with the low-temperature fluid, so that the water in the first hydraulic capsule plugging device and the second hydraulic capsule plugging device is changed into ice, and the volume of the water is increased after the water phase is changed into ice, so that the pressing force between the first hydraulic capsule plugging device and the second hydraulic capsule plugging device and the inner wall of the gas extraction drill hole is further increased, and the sealing effect between the hydraulic capsule plugging device and the inner wall of the; after the operation lasts for a period of time, the other end of the low-temperature fluid injection pipe is disconnected from the low-temperature fluid pump and is plugged, the exhaust pipe keeps a pressure relief state, the situation that the phase change expansion pressure of the low-temperature fluid in the sealed space is too large to influence the plugging effect is avoided, the ice plugging and sealing process of the gas extraction drill hole is completed, the gas outlet end of the gas extraction pipe is connected with extraction equipment, and gas extraction is carried out on the gas extraction drill hole;
E. and D, repeating the steps C and D at intervals to prevent the blocking effect from being reduced due to the fact that ice is melted by heating.
2. The cryogenic fluid quick-freezing ice blocking method for the gas extraction drill hole as claimed in claim 1, wherein the cryogenic fluid is one of liquid nitrogen, liquid carbon dioxide and liquid oxygen.
3. The low-temperature fluid quick-freezing ice blocking method for the gas extraction drill hole as claimed in claim 1, wherein a plurality of air inlets are formed in the wall of the gas extraction pipe close to the air inlet end.
4. The low-temperature-fluid quick-freezing ice plugging method for the gas extraction drill hole as claimed in claim 1, wherein the first hydraulic capsule plugging device and the second hydraulic capsule plugging device are made of rubber.
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| US9441447B2 (en) * | 2010-06-18 | 2016-09-13 | Schlumberger Technology Corporation | Method of isolating a wellbore with solid acid for fracturing |
| CN102140901B (en) * | 2011-05-13 | 2013-11-20 | 中国矿业大学 | High pressure resistant drilled hole sealing method |
| CN103114823B (en) * | 2013-01-31 | 2015-07-29 | 河海大学 | A kind of device and method utilizing ice-bound embolism segmentation shutoff to hole |
| CN107339079B (en) * | 2017-07-20 | 2019-08-02 | 中北大学 | A kind of CO2Plugging device and its method for blocking |
| CN108036685A (en) * | 2017-12-11 | 2018-05-15 | 中铁广州建设有限公司 | A kind of rock multiple-row blasting device and its method for blocking dry ice fracturing rock blasthole |
| CN108361061B (en) * | 2018-04-27 | 2024-03-01 | 河南理工大学 | Low permeability coal seam electric detonation and microwave-assisted liquid nitrogen freeze thawing anti-reflection device and method |
| CN108487878A (en) * | 2018-05-18 | 2018-09-04 | 王景硕 | A kind of frost formula fluid filling hole sealing device |
| CN108825165A (en) * | 2018-06-11 | 2018-11-16 | 中国矿业大学 | A kind of convenient injection type hole packer of mash gas pumping drilling and method for sealing |
| CN109322622B (en) * | 2018-09-28 | 2020-06-09 | 三峡大学 | Ice expansion reaming method for rock-soil body |
| CN110374497A (en) * | 2019-08-29 | 2019-10-25 | 田振林 | A kind of drilling equipment and its boring method in fire damp hole |
| CN111173513B (en) * | 2020-03-16 | 2020-11-27 | 中国矿业大学 | Low-temperature fracturing roof caving method for hard roof of coal mine goaf |
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