CN111608723A - Drainage method for gas extraction hole - Google Patents

Drainage method for gas extraction hole Download PDF

Info

Publication number
CN111608723A
CN111608723A CN202010518071.6A CN202010518071A CN111608723A CN 111608723 A CN111608723 A CN 111608723A CN 202010518071 A CN202010518071 A CN 202010518071A CN 111608723 A CN111608723 A CN 111608723A
Authority
CN
China
Prior art keywords
pipe
hole
wall
hole sealing
drainage
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN202010518071.6A
Other languages
Chinese (zh)
Other versions
CN111608723B (en
Inventor
杜海军
刘海涛
王小兵
李超
刘正平
冯长春
柳永红
董兴洪
孙光全
邓德智
何颜远
郭进
刘光忠
田茂建
陈伟
蒋梦军
李华
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sichuan Chuanmei Huarong Energy Co.,Ltd.
Original Assignee
Sichuan Chuanmei Huarong Energy Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sichuan Chuanmei Huarong Energy Co ltd filed Critical Sichuan Chuanmei Huarong Energy Co ltd
Priority to CN202010518071.6A priority Critical patent/CN111608723B/en
Publication of CN111608723A publication Critical patent/CN111608723A/en
Application granted granted Critical
Publication of CN111608723B publication Critical patent/CN111608723B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21FSAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
    • E21F7/00Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B33/00Sealing or packing boreholes or wells
    • E21B33/10Sealing or packing boreholes or wells in the borehole
    • E21B33/13Methods or devices for cementing, for plugging holes, crevices, or the like
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/006Production of coal-bed methane
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21FSAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
    • E21F16/00Drainage

Abstract

The invention discloses a drainage method of a gas extraction hole, belongs to the field of coal mine gas extraction, and aims to realize synchronous upward hole drainage and gas exhaust so as to technically extract gas. Step one, embedding a hole sealing buried pipe in an upward extraction hole; step two, assembling a drain pipe and an exhaust pipe by utilizing the connecting device arranged at the bottom end of the hole sealing buried pipe: thirdly, starting an extraction system, and extracting gas in the extraction hole through an exhaust passage; and water in the extraction hole is discharged through the drainage passage under the action of weight. The invention discloses a drainage method of a gas extraction hole, which is characterized in that a drainage pipe is communicated with a hole sealing buried pipe through a connecting device to form a drainage passage; the exhaust pipe is inserted into the hole sealing buried pipe through the connecting device to form an exhaust passage; through the design of the inner pipe and the outer pipe of the connecting device, the drainage passage and the exhaust passage are mutually independent and do not interfere with each other, gas-water separation is realized, gas extraction and drainage of extraction holes can be simultaneously carried out, and therefore the purpose of timely gas extraction is achieved. And gravity self-flowing drainage, easy control and low cost.

Description

Drainage method for gas extraction hole
Technical Field
The invention belongs to the field of coal mine gas extraction, and particularly relates to a drainage method for a gas extraction hole.
Background
During coal mining, a gas extraction hole needs to be drilled on the roadway surface to extract gas in the coal seam, so that the safety of coal mining is ensured. When gas is extracted, the gas is divided into an upward hole, a downward hole and a horizontal hole according to the drilling angle, the drill hole extending downwards from the horizontal plane is called a downward hole, and the drill hole extending upwards from the horizontal plane is called an upward hole.
At present, deep hole extraction is generally adopted in gas extraction, extraction holes are formed in rock strata and extend to the deep part of a coal seam, and water for construction such as seepage and water gushing of water of rock strata and the coal seam around the extraction holes, drilling operation and the like is converged into the extraction holes. And the extraction hole is internally provided with an extraction pipe for extracting gas, if water in the extraction hole enters the extraction pipe, the section of the extraction pipe is affected, and the resistance of the extraction pipe is increased, so that the extraction hole needs to be drained.
The traditional adoption automatic water discharger discharges the water in the upward hole, and the automatic water discharger is automatically controlled through the buoyancy thereof, so that the cost is high, and when the water inflow in the hole is large, the automatic water discharger frequently acts, and the blockage and the damage are easy to occur, therefore, in the extraction hole with large water inflow, an extraction system is adopted without connection, and the extraction is carried out after the water inflow is obviously reduced, so that some drill holes with large water inflow and gas outflow cannot be extracted in time.
Disclosure of Invention
The invention aims to provide a drainage method for a gas extraction hole, which realizes synchronous drainage and exhaust of upward holes and improves extraction efficiency.
The technical scheme adopted by the invention is as follows: a method for draining water from a gas extraction hole,
step one, embedding a hole sealing buried pipe in an upward extraction hole;
step two, assembling a drain pipe and an exhaust pipe by using a connecting device arranged at the bottom end of the hole sealing buried pipe:
the connecting device comprises an outer pipe and an inner pipe; the two ends of the outer pipe are communicated, one end is a plug-in end, and the other end is a connecting end; the outer wall of the outer pipe is provided with an orifice which is penetrated by the inner cavity of the outer pipe along the radial direction of the outer pipe; the inner pipe is L-shaped, one end of the inner pipe is a splicing end, and the other end of the inner pipe is a connecting end; the inner pipe is inserted in the outer pipe, and an insertion space is arranged between the inner wall of the outer pipe and the outer wall of the inner pipe; the inserting end of the inner pipe extends to the inserting end of the outer pipe along the axial direction of the outer pipe, the connecting end penetrates through the orifice of the outer pipe along the radial direction of the outer pipe, and the outer wall of the inner pipe is connected with the orifice in a sealing mode;
inserting the bottom end of the hole sealing buried pipe into the inserting space, and locking the outer pipe and the hole sealing buried pipe;
one end of the drain pipe is a water inlet, the other end of the drain pipe is a water outlet, and the water inlet of the drain pipe is connected with the connecting end of the outer pipe, so that the hole-sealing buried pipe, the outer pipe and the drain pipe are communicated to form a drain passage; a normally closed one-way valve for switching on and off the water outlet of the drain pipe is arranged at the water outlet of the drain pipe;
the exhaust pipe comprises a suction section and a discharge section which are independent of each other; the pumping section is inserted into the hole sealing buried pipe, the bottom end of the pumping section is inserted into the inner pipe, and the top end of the pumping section extends into an extraction hole area above the hole sealing buried pipe; a pipe orifice at one end of the discharge section is connected with the connecting end of the inner pipe, and a pipe orifice at the other end of the discharge section is connected with the extraction system, so that the suction section, the inner pipe and the discharge section are communicated to form an exhaust passage;
thirdly, starting an extraction system, and extracting gas in the extraction hole through an exhaust passage; and water in the extraction hole is discharged through the drainage passage under the action of weight.
Further, in the first step, firstly, a hole sealing buried pipe, a grouting pipe, an exhaust pipe and the connecting device are prepared;
inserting the bottom end of the hole sealing buried pipe into the inserting space, locking the relative position of the outer pipe and the hole sealing buried pipe, and connecting the grouting pipe to the connecting end of the outer pipe to enable the grouting pipe, the outer pipe and the hole sealing buried pipe to be communicated to form a grouting passage;
inserting the suction section of the exhaust pipe into the hole sealing buried pipe, inserting the bottom end of the exhaust pipe into the inner pipe, and extending the top end of the exhaust pipe into an extraction hole area above the hole sealing buried pipe; connecting a pipe orifice at one end of the discharge section with the connecting end of the inner pipe, and opening a pipe orifice at the other end of the discharge section to ensure that the suction section, the inner pipe and the discharge section are communicated to form a pulp return passage;
arranging the hole sealing buried pipe in the extraction hole, and filling a pre-sealing material between the inner wall of the extraction hole and the outer wall of the hole sealing buried pipe to seal an opening between the extraction hole and the hole sealing buried pipe;
then, grouting is carried out in the hole sealing buried pipe through a grouting pipe, and grouting is stopped until the grout flows out from a pipe orifice of a discharge section of the exhaust pipe;
then, clearing the inner cavity of the hole sealing buried pipe, and removing the slurry exceeding the top end of the hole sealing buried pipe;
and finally, plugging a connecting passage between the hole sealing buried pipe and the outside, and maintaining until the slurry in the extraction hole is solidified.
Furthermore, after grouting is finished, the connecting device, the exhaust pipe and the grouting pipe are disassembled.
Furthermore, exhaust holes are densely distributed on the outer wall of the pumping section of the exhaust pipe; step two, when the pumping-in section of the exhaust pipe is inserted into the hole sealing buried pipe, a plug support for plugging an opening at the top end of the pumping-in section of the exhaust pipe is installed at the top end of the exhaust pipe, and the plug support comprises a plugging cap and a first support arranged on the periphery of the plugging cap; the extraction end of the exhaust pipe is inserted into the plugging cap, and the exhaust pipe is connected with the plugging cap through a screw.
Further, the exhaust pipe used in the step one is used as the exhaust pipe in the step two after slurry is removed;
and the connecting device used in the step one is used as the connecting device in the step two after the slurry is removed.
Furthermore, the connecting device is provided with a locking sleeve and a ball;
a circle of positioning holes are formed in the wall of the outer pipe along the circumferential direction of the outer pipe, penetrate through the wall of the outer pipe and are communicated with the inner cavity of the outer pipe;
the inner cavity of the locking sleeve is provided with a tapered section which is gradually enlarged along the axial direction;
one ball is movably arranged in each positioning hole;
the locking sleeve is sleeved on the periphery of the outer pipe and is in threaded fit connection with the outer pipe along the axial direction of the outer pipe, the tapered section of the inner cavity of the locking sleeve tends to be enlarged along the direction from the connecting end to the inserting end of the outer pipe, the outer side of the ball is in extrusion fit with the inner wall of the locking sleeve, and the inner side of the ball is in extrusion fit with the outer wall of the hole sealing buried pipe.
Furthermore, the inner wall of the outer pipe surrounds a slot with an opening arranged in the axial direction and facing the insertion end of the outer pipe; the inner wall of the outer pipe is provided with a sealing ring groove which is radially and outwards sunken along the inner wall of the outer pipe and corresponds to the slot, and a sealing ring which is in extrusion fit with the inner wall of the outer pipe and the outer wall of the hole sealing buried pipe is clamped in the sealing ring groove.
Furthermore, a plurality of first pressure relief holes are formed in the pipe wall of the outer pipe along the circumferential direction of the outer pipe, and the first pressure relief holes penetrate through the pipe wall of the outer pipe and are communicated with the inner cavity of the outer pipe; along the axial direction of the outer pipe, the pressure relief hole is positioned between the insertion end of the outer pipe and the sealing ring groove;
and a second pressure relief hole corresponding to the first pressure relief hole is formed in the pipe wall of the locking sleeve.
Further, in the third step, after the extraction system is started, negative pressure is formed in the extraction hole, and the negative pressure value is P1; collecting water in the extraction holes into a drain pipe through the hole sealing buried pipe, wherein the water pressure value is P2, and the one-way valve of the drain pipe is automatically opened for draining until P2 is more than P1; draining until P2 is not more than P1, and automatically closing the one-way valve.
The invention has the beneficial effects that: the invention discloses a drainage method of a gas extraction hole, which is characterized in that a drainage pipe is communicated with a hole sealing buried pipe through a connecting device to form a drainage passage; the exhaust pipe is inserted into the hole sealing buried pipe through the connecting device to form an exhaust passage; through the design of the inner pipe and the outer pipe of the connecting device, the drainage passage and the exhaust passage are mutually independent and do not interfere with each other, gas-water separation is realized, gas extraction and drainage of extraction holes can be simultaneously carried out, and therefore the purpose of timely gas extraction is achieved. And gravity-flow drainage is adopted, the drainage process is simple and easy to control, and the drainage cost is low.
Drawings
FIG. 1 is a schematic view of embedding a hole-sealing buried pipe;
FIG. 2 is a schematic diagram of drainage from extraction holes;
fig. 3 is a sectional view of the connecting device assembled to the hole sealing buried pipe, the water discharging pipe and the air discharging pipe.
In the figure, a connecting device 1, an outer pipe 11, an orifice 111, a first pressure relief hole 112, an insertion groove 113, a sealing ring groove 114, a positioning hole 115, an insertion space 116, an inner pipe 12, a locking sleeve 13, a second pressure relief hole 131, a ball 14, a hole sealing embedded pipe 2, a drain pipe 3, a one-way valve 31, an exhaust pipe 4, an exhaust hole 41, a plug support 42, a plug cap 421, a first support 422, a suction section 43, a discharge section 44, a grouting pipe 5 and a pre-sealing material 6.
Detailed Description
The invention is further described below with reference to the following figures and examples:
the drainage method of the gas extraction hole comprises the following steps that firstly, a hole sealing buried pipe 2 is buried in the upward extraction hole;
step two, assembling a drain pipe 3 and an exhaust pipe 4 by using the connecting device 1 arranged at the bottom end of the hole sealing buried pipe 2:
as shown in fig. 2 and 3, the connecting device 1 includes an outer tube 11 and an inner tube 12; the two ends of the outer pipe 11 are through, one end is a plug-in end, and the other end is a connecting end; the outer wall of the outer tube 11 is provided with an orifice 111 which is penetrated by the inner cavity of the outer tube 11 along the radial direction; the inner tube 12 is L-shaped, one end is a plug-in end, and the other end is a connecting end; the inner pipe 12 is inserted in the outer pipe 11, and an insertion space 116 is arranged between the inner wall of the outer pipe 11 and the outer wall of the inner pipe 12; the inserting end of the inner tube 12 extends to the inserting end of the outer tube 11 along the axial direction of the outer tube 11, the connecting end penetrates through the hole 111 of the outer tube 11 along the radial direction of the outer tube 11, and the outer wall of the inner tube 12 is connected with the hole 111 in a sealing mode;
inserting the bottom end of the hole sealing buried pipe 2 into the inserting space 116, and locking the outer pipe 11 and the hole sealing buried pipe 2;
one end of the drain pipe 3 is a water inlet, the other end of the drain pipe 3 is a water outlet, and the water inlet of the drain pipe 3 is connected with the connecting end of the outer pipe 11, so that the hole sealing buried pipe 2, the outer pipe 11 and the drain pipe 3 are communicated to form a drain passage; a normally closed one-way valve 31 for switching on and off the water outlet of the drain pipe 3 is arranged at the water outlet of the drain pipe 3;
the exhaust pipe 4 comprises an intake section 43 and a discharge section 44 which are independent of each other; the pumping-in section 43 is inserted into the hole sealing buried pipe 2, the bottom end of the pumping-in section is inserted into the inner pipe 12, and the top end of the pumping-in section extends into the area of the pumping hole above the hole sealing buried pipe 2; a pipe orifice at one end of the discharge section 44 is connected with the connecting end of the inner pipe 12, and a pipe orifice at the other end is connected with an extraction system, so that the suction section 43, the inner pipe 12 and the discharge section 44 are communicated to form an exhaust passage;
thirdly, starting an extraction system, and extracting gas in the extraction hole through an exhaust passage; and water in the extraction hole is discharged through the drainage passage under the action of weight.
The invention discloses a drainage method of a gas extraction hole, which is characterized in that a drainage pipe 3 is communicated with a hole sealing buried pipe 2 through a connecting device 1 to form a drainage passage; an exhaust pipe 4 is inserted into the hole sealing buried pipe 2 through the connecting device 1 to form an exhaust passage; through the design of the inner pipe 12 and the outer pipe 11 of the connecting device 1, the drainage passage and the exhaust passage are independent and do not interfere with each other, gas-water separation is realized, gas extraction and drainage of extraction holes can be simultaneously carried out, and the purpose of timely gas extraction is realized.
In addition, the hole sealing buried pipe 2 is inserted into the insertion space 116 between the outer pipe 11 and the inner pipe 12 of the connecting device 1 in an insertion mode and is locked, so that the connecting process is simple and the connection is reliable. Of course, the width dimension of the plugging space 116 needs to be larger than the wall thickness of the hole sealing buried pipe 2, so that not only the insertion of the hole sealing buried pipe 2 can be accommodated, but also the inner cavity of the hole sealing buried pipe 2 is communicated with the exhaust pipe 4 after the insertion of the hole sealing buried pipe 2.
The normally closed one-way valve 31 arranged at the water outlet of the drain pipe 3 is in a closed state in a natural state, so that the effect of blocking the water outlet of the drain pipe 3 is achieved, and gas can be prevented from leaking through the water outlet of the blocked drain pipe 3; when the pressure difference between the inside and the outside of the check valve 31 is a positive value, the check valve 31 is opened, and water flows out. During specific extraction, after the extraction system is started, gas is extracted through the exhaust passage, negative pressure is formed in the extraction hole, and the negative pressure value is set to be P1; water in the extraction holes is collected in the drain pipe 3 through the hole sealing buried pipe 2, the water pressure value is P2 until P2 is larger than P1, the pressure difference between the inside and the outside of the one-way valve 31 is a positive value, and the one-way valve 31 of the drain pipe 3 is automatically opened for draining; and draining until P2 is not more than P1, wherein the pressure difference between the inside and the outside of the one-way valve 31 is a negative value, and the one-way valve 31 is automatically closed. The drainage mode is beneficial to gravity-flow drainage, the drainage structure is simple and easy to control, and the drainage cost is low.
The grouting pipe 5 can be extended into the extraction hole for grouting through the hole sealing buried pipe 2, but the structure is complex and the operation is not easy. In the invention, as shown in fig. 1 and 3, in the first step, firstly, a hole sealing buried pipe 2, a grouting pipe 5, an exhaust pipe 4 and the connecting device 1 are prepared;
inserting the bottom end of the hole sealing buried pipe 2 into the inserting space 116, locking the relative position of the outer pipe 11 and the hole sealing buried pipe 2, and connecting the grouting pipe 5 to the connecting end of the outer pipe 11 to ensure that the grouting pipe 5, the outer pipe 11 and the hole sealing buried pipe 2 are communicated to form a grouting passage;
inserting the pumping section 43 of the exhaust pipe 4 into the hole sealing buried pipe 2, inserting the bottom end of the pumping section into the inner pipe 12, and extending the top end of the pumping section into the extraction hole area above the hole sealing buried pipe 2; connecting a pipe orifice at one end of the discharge section 44 with the connecting end of the inner pipe 12, and opening a pipe orifice at the other end to ensure that the suction section 43, the inner pipe 12 and the discharge section 44 are communicated to form a pulp return passage;
arranging the hole sealing buried pipe 2 in the extraction hole, and filling a pre-sealing material 6 between the inner wall of the extraction hole and the outer wall of the hole sealing buried pipe 2 to seal an opening between the extraction hole and the hole sealing buried pipe 2;
then, grouting is carried out in the hole sealing buried pipe 2 through the grouting pipe 5 until the grout flows out from the orifice of the discharge section 44 of the exhaust pipe 4;
then, clearing the inner cavity of the hole sealing buried pipe 2, and removing the slurry exceeding the top end of the hole sealing buried pipe 2;
and finally, plugging a connecting passage between the hole sealing buried pipe 2 and the outside, and maintaining until the slurry in the extraction hole is solidified.
During grouting, the grout is injected into the extraction hole through the hole sealing buried pipe 2 from the grouting pipe 5 upwards. Under the action of gravity, slurry is accumulated from bottom to top, the bottom opening of the extraction hole is sealed, the space in the extraction hole is reduced, gas in the extraction hole is discharged through the exhaust pipe 4, pressure is released, and smooth completion of grouting work is guaranteed. Along with the liquid level of thick liquid rises to the top of blast pipe 4 gradually, the thick liquid can flow through blast pipe 4, and the suggestion thick liquid height reaches the requirement, and slip casting is accomplished. According to the invention, the components required for embedding the hole sealing buried pipe 2 and subsequent drainage are approximately the same, if the hole sealing buried pipe 2, the connecting device 1 and the exhaust pipe 4 are adopted, and only the grouting pipe 5 is different from the drainage pipe 3, so that the types of the components in a construction site are reduced, and the components used for embedding the hole sealing buried pipe 2 can be utilized for subsequent drainage.
In order to facilitate the installation of the relevant parts required for the subsequent drainage, it is preferred that the connection device 1, the exhaust pipe 4 and the grouting pipe 5 are disassembled after the grouting is completed.
After the connecting device 1, the exhaust pipe 4 and the grouting pipe 5 used when the buried pipe 2 is buried are removed, the connecting device 1 and the exhaust pipe 4 can be replaced with new ones for drainage, or the old connecting device 1 and the exhaust pipe 4 can be cleaned of the grout before being assembled with the buried pipe 2 for drainage.
In order to prevent water flow from entering the exhaust pipe 4 when the pumping section 43 of the exhaust pipe 4 is attached to the hole wall of the extraction hole and prevent impurities from entering the exhaust pipe 4 in the pipe inserting process of the pumping section 43 of the exhaust pipe 4, preferably, exhaust holes 41 are densely distributed on the outer wall of the pumping section 43 of the exhaust pipe 4; in the second step, when the pumping-in section 43 of the exhaust pipe 4 is inserted into the hole sealing buried pipe 2, a plug support 42 for sealing an opening at the top end of the pumping-in section 43 of the exhaust pipe 4 is installed at the top end of the pumping-in section 43, wherein the plug support 42 comprises a sealing cap 421 and a first support 422 arranged on the periphery of the sealing cap 421; the extraction end of the exhaust pipe 4 is inserted into the plugging cap 421, and the exhaust pipe 4 is connected with the plugging cap 421 through a screw. The plugging cap 421 is used to plug the top opening of the drawing section 43 of the exhaust pipe 4 to prevent entry of impurities during the pipe insertion process, and the exhaust hole 41 is used for gas to enter the exhaust pipe 4. The first support 422 is used for preventing the pumping section 43 of the exhaust pipe 4 from being attached to the inner wall of the extraction hole.
In order to save resources, it is preferable that the exhaust pipe 4 used in the first step is used as the exhaust pipe 4 in the second step after removing the slurry; the connector 1 used in the first step is used as the connector 1 in the second step after the slurry is removed.
In order to lock the hole sealing buried pipe 2 and the connecting device 1, the connection failure is avoided. Preferably, the connecting device 1 is provided with a locking sleeve 13 and a ball 14; a circle of positioning holes 115 are formed in the wall of the outer tube 11 along the circumferential direction of the outer tube 11, and the positioning holes 115 penetrate through the wall of the outer tube 11 and are communicated with the inner cavity of the outer tube 11;
the inner cavity of the locking sleeve 13 is provided with a tapered section which is gradually enlarged along the axial direction; one ball 14 is movably arranged in each positioning hole 115; the locking sleeve 13 is sleeved on the periphery of the outer pipe 11, is in threaded fit connection with the outer pipe 11 along the axial direction of the outer pipe 11, and is in an expansion trend along the direction from the connecting end to the inserting end of the outer pipe 11, the outer side of the ball 14 is in extrusion fit with the inner wall of the locking sleeve 13, and the inner side of the ball is in extrusion fit with the outer wall of the hole sealing buried pipe 2.
In the structure, the end with larger diameter of the inner cavity of the locking sleeve 13 is close to the inserting end of the outer tube 11 and is sleeved on the outer tube 11. Due to the arrangement of the tapered section of the inner cavity of the locking sleeve 13, when the locking sleeve 13 moves towards the insertion end of the outer tube 11 along the axial direction of the outer tube 11, the inner wall of the locking sleeve 13 gradually increases the extrusion on the ball 14, so that the ball 14 moves along the axial direction of the positioning hole 115 to gradually pressurize the outer wall of the hole sealing buried pipe 2, and the hole sealing buried pipe 2 is tightly fixed. When the fixing of the hole sealing buried pipe 2 needs to be loosened, the locking sleeve 13 is moved towards the connecting end of the outer pipe 11 along the axial direction of the outer pipe 11, the size of the inner cavity of the locking sleeve 13 in contact with the balls 14 is gradually increased, the squeezing effect on the balls 14 is smaller and smaller, and therefore the hole sealing buried pipe 2 is loosened, and the hole sealing buried pipe can be pulled out along the axial direction of the hole sealing buried pipe 2. The locking mechanism is simple in structure, reliable in locking and adjustable in locking force.
The inserting space 116 between the inner wall of the outer pipe 11 and the outer wall of the inner pipe 12 can be axially communicated along the outer pipe 11, however, in the process of grouting, slurry rises and is easily embedded between the outer wall of the hole sealing buried pipe 2 and the inner wall of the outer pipe 11, and optimally, the opening axially arranged on the inner wall of the outer pipe 11 around the inner wall of the outer pipe faces to the inserting slot 113 at the inserting end of the outer pipe 11; a sealing ring groove 114 which is recessed outwards along the radial direction is arranged at the corresponding position of the inner wall of the outer pipe 11 and the slot 113, and a sealing ring which is in extrusion fit with the inner wall of the outer pipe 11 and the outer wall of the hole sealing buried pipe 2 is clamped in the sealing ring groove 114.
The arrangement of the slot 113 not only alleviates the above problems, but also plays a role in limiting the insertion depth of the hole sealing buried pipe 11 along the axial direction of the outer pipe 11; the plugging end of the hole sealing buried pipe 11 is limited along the radial direction, so that the hole sealing buried pipe 11 is prevented from excessively deviating from the axis of the outer pipe 11. Of course, a space is provided between the insertion groove 113 and the outer wall of the inner tube 12, and the space communicates between a portion of the inner cavity of the outer tube 11 at one end of the insertion groove 113 and a portion at the other end of the insertion groove 113.
The sealing ring is arranged in the sealing ring groove 114 to form sealing between the inner wall of the outer pipe 11 and the outer wall of the hole sealing buried pipe, so that the inner cavity of the hole sealing buried pipe is prevented from being communicated with the outer wall area of the outer pipe 11 through a gap between the inner wall of the outer pipe 11 and the outer wall of the hole sealing buried pipe.
In order to facilitate the separation of the connecting device 1 from the hole sealing buried pipe 2, preferably, a plurality of first pressure relief holes 112 are formed in the pipe wall of the outer pipe 11 along the circumferential direction of the outer pipe 11, and the first pressure relief holes 112 penetrate through the pipe wall of the outer pipe 11 and are communicated with the inner cavity of the outer pipe 11; along the axial direction of the outer tube 11, the first pressure relief hole 112 is positioned between the insertion end of the outer tube 11 and the sealing ring groove 114; and a second pressure relief hole 131 corresponding to the first pressure relief hole 112 is formed in the pipe wall of the locking sleeve 13.
After grouting hole sealing or in the drainage process, the areas surrounded by the hole sealing buried pipe 2, the connecting device 1 and the extraction hole are sealed areas, through the arrangement of the first pressure relief hole 112 and the second pressure relief hole 131, when the hole sealing buried pipe 2 is axially separated from the hole sealing buried pipe 2 and the outer pipe 11 along the outer pipe 11, the pipe orifice of the hole sealing buried pipe 2 reaches the position of the first pressure relief hole 112, the pressure of the sealed area is released through the first pressure relief hole 112, and therefore the reverse thrust of the separation of the hole sealing buried pipe 2 and the outer pipe 11 is reduced.

Claims (9)

1. The drainage method of the gas extraction hole is characterized by comprising the following steps:
step one, embedding a hole sealing buried pipe (2) in an upward extraction hole;
step two, assembling a drain pipe (3) and an exhaust pipe (4) by using a connecting device (1) arranged at the bottom end of the hole sealing buried pipe (2):
the connecting device (1) comprises an outer tube (11) and an inner tube (12); the two ends of the outer pipe (11) are communicated, one end is a plug-in end, and the other end is a connecting end; an orifice (111) which is penetrated by the inner cavity of the outer pipe (11) along the radial direction is arranged on the outer wall of the outer pipe (11); the inner pipe (12) is L-shaped, one end of the inner pipe is a splicing end, and the other end of the inner pipe is a connecting end; the inner pipe (12) is inserted in the outer pipe (11), and an insertion space (116) is arranged between the inner wall of the outer pipe (11) and the outer wall of the inner pipe (12); the inserting end of the inner pipe (12) extends to the inserting end of the outer pipe (11) along the axial direction of the outer pipe (11), the connecting end radially penetrates through the hole (111) of the outer pipe (11) along the outer pipe (11), and the outer wall of the inner pipe (12) is connected with the hole (111) in a sealing mode;
inserting the bottom end of the hole sealing buried pipe (2) into the inserting space (116), and locking the outer pipe (11) and the hole sealing buried pipe (2);
one end of the drain pipe (3) is a water inlet, the other end of the drain pipe is a water outlet, the water inlet of the drain pipe (3) is connected with the connecting end of the outer pipe (11), and the hole sealing buried pipe (2), the outer pipe (11) and the drain pipe (3) are communicated to form a drain passage; a normally closed one-way valve (31) for switching on and off the water outlet of the drain pipe (3) is arranged at the water outlet of the drain pipe (3);
the exhaust pipe (4) comprises an intake section (43) and a discharge section (44) which are independent of each other; the pumping-in section (43) is inserted into the hole sealing buried pipe (2), the bottom end of the pumping-in section is inserted into the inner pipe (12), and the top end of the pumping-in section extends into the area of the extraction hole above the hole sealing buried pipe (2); a pipe orifice at one end of the discharge section (44) is connected with the connecting end of the inner pipe (12), and a pipe orifice at the other end is connected with a drainage system, so that the suction section (43), the inner pipe (12) and the discharge section (44) are communicated to form an exhaust passage;
thirdly, starting an extraction system, and extracting gas in the extraction hole through an exhaust passage; and water in the extraction hole is discharged through the drainage passage under the action of weight.
2. The gas extraction hole drainage method according to claim 1, characterized by comprising: in the first step, firstly, preparing a hole sealing buried pipe (2), a grouting pipe (5), an exhaust pipe (4) and the connecting device (1);
inserting the bottom end of the hole sealing buried pipe (2) into the inserting space (116), locking the relative position of the outer pipe (11) and the hole sealing buried pipe (2), connecting the grouting pipe (5) to the connecting end of the outer pipe (11), and enabling the grouting pipe (5), the outer pipe (11) and the hole sealing buried pipe (2) to penetrate to form a grouting passage;
inserting the pumping-in section (43) of the exhaust pipe (4) into the hole sealing buried pipe (2), inserting the bottom end of the pumping-in section into the inner pipe (12), and extending the top end of the pumping-in section into the area of the pumping hole above the hole sealing buried pipe (2); connecting a pipe orifice at one end of the discharge section (44) with the connecting end of the inner pipe (12), and opening a pipe orifice at the other end to ensure that the suction section (43), the inner pipe (12) and the discharge section (44) are communicated to form a pulp return passage;
arranging the hole sealing buried pipe (2) in the extraction hole, and filling a pre-sealing material (6) between the inner wall of the extraction hole and the outer wall of the hole sealing buried pipe (2) to seal an opening between the extraction hole and the hole sealing buried pipe (2);
then, grouting is carried out in the hole sealing buried pipe (2) through the grouting pipe (5) until the grout flows out from the orifice of the discharge section (44) of the exhaust pipe (4);
then, clearing the inner cavity of the hole sealing buried pipe (2) and removing the slurry exceeding the top end of the hole sealing buried pipe (2);
and finally, plugging a connecting passage between the hole sealing buried pipe (2) and the outside, and maintaining until the slurry in the extraction hole is solidified.
3. The gas extraction hole drainage method according to claim 2, characterized by comprising: after grouting, the connecting device (1), the exhaust pipe (4) and the grouting pipe (5) are disassembled.
4. The method for draining the gas extraction hole according to any one of claims 1 to 3, wherein: exhaust holes (41) are densely distributed on the outer wall of the pumping-in section (43) of the exhaust pipe (4); step two, when the pumping-in section (43) of the exhaust pipe (4) is inserted into the hole sealing buried pipe (2), firstly, a plug support (42) for sealing an opening at the top end of the pumping-in section (43) of the exhaust pipe (4) is installed at the top end of the pumping-in section (43), and the plug support (42) comprises a sealing cap (421) and a first support (422) arranged on the periphery of the sealing cap (421); the extraction end of the exhaust pipe (4) is inserted into the plugging cap (421), and the exhaust pipe (4) is connected with the plugging cap (421) through a screw.
5. The gas extraction hole drainage method according to claim 2 or 3, characterized by comprising: the exhaust pipe (4) used in the first step is used as the exhaust pipe (4) in the second step after slurry is removed;
the connecting device (1) used in the first step is used as the connecting device (1) in the second step after the slurry is removed.
6. The method for draining the gas extraction hole according to any one of claims 1 to 3, wherein: the connecting device (1) is provided with a locking sleeve (13) and a ball (14);
a circle of positioning holes (115) are formed in the wall of the outer pipe (11) along the circumferential direction of the outer pipe (11), and the positioning holes (115) penetrate through the wall of the outer pipe (11) and are communicated with the inner cavity of the outer pipe (11);
the inner cavity of the locking sleeve (13) is provided with a tapered section which is gradually enlarged along the axial direction;
one ball (14) is movably arranged in each positioning hole (115);
the locking sleeve (13) is sleeved on the periphery of the outer pipe (11) and is in threaded fit connection with the outer pipe (11) along the axial direction of the outer pipe (11), the conical section of the inner cavity of the locking sleeve (13) is in an expanding trend along the direction from the connecting end to the inserting end of the outer pipe (11), the outer side of the ball (14) is in extrusion fit with the inner wall of the locking sleeve (13), and the inner side of the ball is in extrusion fit with the outer wall of the hole sealing buried pipe (2).
7. The gas extraction hole drainage method according to claim 6, characterized by comprising: the inner wall of the outer pipe (11) surrounds a slot (113) with an opening facing the insertion end of the outer pipe (11) and arranged in the axial direction of the inner wall; a sealing ring groove (114) which is radially and outwards sunken is arranged at the position, corresponding to the slot (113), of the inner wall of the outer pipe (11), and a sealing ring which is in extrusion fit with the inner wall of the outer pipe (11) and the outer wall of the hole sealing buried pipe (2) is clamped in the sealing ring groove (114).
8. The gas extraction hole drainage method according to claim 7, characterized by comprising: a plurality of first pressure relief holes (112) are formed in the wall of the outer pipe (11) along the circumferential direction of the outer pipe (11), and the first pressure relief holes (112) penetrate through the wall of the outer pipe (11) and are communicated with the inner cavity of the outer pipe (11); along the axial direction of the outer pipe (11), the first pressure relief hole (112) is positioned between the insertion end of the outer pipe (11) and the sealing ring groove (114);
a second pressure relief hole (131) corresponding to the first pressure relief hole (112) is formed in the pipe wall of the locking sleeve (13).
9. The method for draining the gas extraction hole according to any one of claims 1 to 3, wherein:
in the third step, after the extraction system is started, negative pressure is formed in the extraction hole, and the negative pressure value is P1; water in the drainage holes is collected in the drainage pipe (3) through the hole sealing buried pipe (2), the water pressure value is P2, and until P2 is more than P1, the one-way valve (31) of the drainage pipe (3) is automatically opened for drainage; draining until P2 is not more than P1, and automatically closing the one-way valve (31).
CN202010518071.6A 2020-06-09 2020-06-09 Drainage method for gas extraction hole Active CN111608723B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010518071.6A CN111608723B (en) 2020-06-09 2020-06-09 Drainage method for gas extraction hole

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010518071.6A CN111608723B (en) 2020-06-09 2020-06-09 Drainage method for gas extraction hole

Publications (2)

Publication Number Publication Date
CN111608723A true CN111608723A (en) 2020-09-01
CN111608723B CN111608723B (en) 2021-08-24

Family

ID=72205686

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010518071.6A Active CN111608723B (en) 2020-06-09 2020-06-09 Drainage method for gas extraction hole

Country Status (1)

Country Link
CN (1) CN111608723B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113062706A (en) * 2021-04-06 2021-07-02 中南大学 Coal seam gas extraction system and method

Citations (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3211824A1 (en) * 1982-03-31 1983-10-13 Müller & Borggräfe KG, 5820 Gevelsberg Water separator for the gas drainage in underground working
CN101598029A (en) * 2009-06-26 2009-12-09 中国矿业大学 Ascending hole coal seam gas pressure measurement water pressure excluding instrument and method
CN101975078A (en) * 2010-10-11 2011-02-16 河南理工大学 Gas extraction drilling coupling device and installation and use method thereof
CN102135014A (en) * 2011-03-15 2011-07-27 山西青科恒安矿业新材料有限公司 Automatic draining device
CN202866868U (en) * 2012-09-20 2013-04-10 中煤科工集团重庆研究院 Novel dehydration and deslagging device used for mine gas extraction pipeline
CN203146015U (en) * 2013-03-06 2013-08-21 中国矿业大学 Ascending drilling hole orifice drainage device
CN203685269U (en) * 2013-12-31 2014-07-02 中国矿业大学 Orifice device for reserved pumping drainage of gas
CN203742662U (en) * 2014-03-26 2014-07-30 淮南矿业(集团)有限责任公司 Piecing device for water drainage of gas extraction hole
CN105114119A (en) * 2015-08-21 2015-12-02 贵州大学 Improved gas extraction structure adopting downward hole drainage and implementation method thereof
CN206233896U (en) * 2016-11-18 2017-06-09 河南理工大学 For the anti-pumping blocking of gas pumping and the outer plugging device of drainage holes
CN206845219U (en) * 2017-06-22 2018-01-05 重庆南桐矿业有限责任公司 A kind of air water automatic separating apparatus of gas drainage pipeline
CN208073542U (en) * 2018-03-21 2018-11-09 四川铁创科技有限公司 One body swimming qi leel for pernicious gas tunnel is from four-way box
CN109826664A (en) * 2019-04-12 2019-05-31 中国矿业大学(北京) A kind of coal bed gas extraction and drill ponding automatic-discharging integrated apparatus and method
CN109915205A (en) * 2019-04-23 2019-06-21 吕梁学院 Dead-weight deslagging water discharging device and its deslagging discharge water method
CN110439530A (en) * 2019-09-16 2019-11-12 平顶山市安泰华矿用安全设备制造有限公司 A kind of separator box cylinder Integral rotary air water slag separation pedrail

Patent Citations (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3211824A1 (en) * 1982-03-31 1983-10-13 Müller & Borggräfe KG, 5820 Gevelsberg Water separator for the gas drainage in underground working
CN101598029A (en) * 2009-06-26 2009-12-09 中国矿业大学 Ascending hole coal seam gas pressure measurement water pressure excluding instrument and method
CN101975078A (en) * 2010-10-11 2011-02-16 河南理工大学 Gas extraction drilling coupling device and installation and use method thereof
CN102135014A (en) * 2011-03-15 2011-07-27 山西青科恒安矿业新材料有限公司 Automatic draining device
CN202866868U (en) * 2012-09-20 2013-04-10 中煤科工集团重庆研究院 Novel dehydration and deslagging device used for mine gas extraction pipeline
CN203146015U (en) * 2013-03-06 2013-08-21 中国矿业大学 Ascending drilling hole orifice drainage device
CN203685269U (en) * 2013-12-31 2014-07-02 中国矿业大学 Orifice device for reserved pumping drainage of gas
CN203742662U (en) * 2014-03-26 2014-07-30 淮南矿业(集团)有限责任公司 Piecing device for water drainage of gas extraction hole
CN105114119A (en) * 2015-08-21 2015-12-02 贵州大学 Improved gas extraction structure adopting downward hole drainage and implementation method thereof
CN206233896U (en) * 2016-11-18 2017-06-09 河南理工大学 For the anti-pumping blocking of gas pumping and the outer plugging device of drainage holes
CN206845219U (en) * 2017-06-22 2018-01-05 重庆南桐矿业有限责任公司 A kind of air water automatic separating apparatus of gas drainage pipeline
CN208073542U (en) * 2018-03-21 2018-11-09 四川铁创科技有限公司 One body swimming qi leel for pernicious gas tunnel is from four-way box
CN109826664A (en) * 2019-04-12 2019-05-31 中国矿业大学(北京) A kind of coal bed gas extraction and drill ponding automatic-discharging integrated apparatus and method
CN109915205A (en) * 2019-04-23 2019-06-21 吕梁学院 Dead-weight deslagging water discharging device and its deslagging discharge water method
CN110439530A (en) * 2019-09-16 2019-11-12 平顶山市安泰华矿用安全设备制造有限公司 A kind of separator box cylinder Integral rotary air water slag separation pedrail

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113062706A (en) * 2021-04-06 2021-07-02 中南大学 Coal seam gas extraction system and method

Also Published As

Publication number Publication date
CN111608723B (en) 2021-08-24

Similar Documents

Publication Publication Date Title
CN111608723B (en) Drainage method for gas extraction hole
CN104763436B (en) A kind of push-bench method of reseptance under high hydraulic pressure complex geological condition and device
CN101787702A (en) Effective vacuum dewatering method
WO2021097937A1 (en) Long tunnel water drainage system
CN107939351B (en) Coal bed gas drainage and gas production device and using method thereof
CN108119100B (en) Oil well lifting system and oil pumping method thereof
CN112917660B (en) Efficient anti-blocking backflow grouting pipe and method
CN104234043B (en) A kind of cast-in-place pile construction method
CN201610552U (en) Strong vacuum unwatering downcomer well
CN102071916A (en) Oil-water separate mining string of bottom water reservoir and jet pump thereof
CN205502044U (en) Be applied to precipitation structure in grittiness water -bearing stratum under building
CN205636765U (en) Inflatable is from inhaling precipitation well
CN110685746A (en) Automatic tunnel drainage system
JP5780855B2 (en) Groundwater pumping equipment
CN203768924U (en) Tubular well used for simultaneously draining and decompressing precipitation
CN105780792B (en) A kind of foundation pit high water head Dewatering by pressure reduction well shut-in well method and structure of shunting in a well
CN212177119U (en) Gas sand anchor capable of flushing sand underground
CN108343408B (en) Water-drive gas reservoir exploitation method
CN111350487B (en) Jet pump-double screw pump co-well injection-production composite lifting system
CN212508414U (en) Gas extraction and drainage integrated device for extraction hole
CN104453798B (en) PVC sleeve pipe waterpower sand blasting perforation device and using method thereof
US8376058B2 (en) Well drilling wash down end cap and method
CN109538793A (en) A kind of one-way water stop grouting device for vertical shaft section of jurisdiction
CN203795442U (en) Sealing cover plate system for underground deep wells
CN109681120A (en) A kind of ultra-long horizontal section casing continues tripping in method

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant
CP01 Change in the name or title of a patent holder
CP01 Change in the name or title of a patent holder

Address after: 617066 Sichuan Chuanmei Huarong Energy Co., Ltd., xujiadu village, West District, Panzhihua City, Sichuan Province

Patentee after: Sichuan Chuanmei Huarong Energy Co.,Ltd.

Address before: 617066 Sichuan Chuanmei Huarong Energy Co., Ltd., xujiadu village, West District, Panzhihua City, Sichuan Province

Patentee before: SICHUAN CHUANMEI HUARONG ENERGY CO.,LTD.