CN110939407B - Double-deck overlapping goaf ground drainage well structure and recovery unit - Google Patents
Double-deck overlapping goaf ground drainage well structure and recovery unit Download PDFInfo
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- CN110939407B CN110939407B CN201811112457.6A CN201811112457A CN110939407B CN 110939407 B CN110939407 B CN 110939407B CN 201811112457 A CN201811112457 A CN 201811112457A CN 110939407 B CN110939407 B CN 110939407B
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- 238000011084 recovery Methods 0.000 title claims abstract description 19
- 238000005553 drilling Methods 0.000 claims abstract description 73
- 238000000605 extraction Methods 0.000 claims abstract description 30
- 239000000463 material Substances 0.000 claims abstract description 21
- 239000003245 coal Substances 0.000 claims abstract description 18
- 238000007789 sealing Methods 0.000 claims description 56
- 230000005540 biological transmission Effects 0.000 claims description 36
- 238000005070 sampling Methods 0.000 claims description 24
- 229910000831 Steel Inorganic materials 0.000 claims description 18
- 239000010959 steel Substances 0.000 claims description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- 210000002445 nipple Anatomy 0.000 claims description 13
- 238000003466 welding Methods 0.000 claims description 10
- 239000000725 suspension Substances 0.000 claims description 9
- 239000004568 cement Substances 0.000 claims description 6
- 239000004927 clay Substances 0.000 claims description 6
- 229920003225 polyurethane elastomer Polymers 0.000 claims description 6
- 230000000694 effects Effects 0.000 abstract description 5
- 238000010276 construction Methods 0.000 abstract description 2
- 238000005265 energy consumption Methods 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 230000015572 biosynthetic process Effects 0.000 description 12
- 239000011435 rock Substances 0.000 description 6
- 238000005065 mining Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 2
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/12—Methods or apparatus for controlling the flow of the obtained fluid to or in wells
- E21B43/121—Lifting well fluids
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/02—Surface sealing or packing
- E21B33/03—Well heads; Setting-up thereof
- E21B33/04—Casing heads; Suspending casings or tubings in well heads
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK 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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Abstract
The invention discloses a ground extraction well body structure and a recovery device of a double-layer overlapped goaf, which comprise an aboveground structure and an underground structure; compared with the existing ground drilling of the goaf with the single thick coal seam, the same set of ground equipment is used for simultaneously extracting gas in two layers of goafs, so that the site, pipeline, extraction equipment and energy consumption cost are saved; one ground extraction well achieves the extraction effect which can be achieved by two wells in the past, and the construction cost of a single well is saved by about half; the well body structure is matched with the hanger, the upper hanging short section and the lower hanging short section for use, so that the three-opening casing pipe and the four-opening slotted screen pipe can be recycled, and well forming materials are greatly saved; the hanger and the upper and lower hanging short sections are simple and convenient to manufacture, and can be reused after being recovered through screw thread connection (the upper hanging short section is well fixed in a well and cannot be recovered).
Description
Technical Field
The invention belongs to the technical field of coal bed gas development, and particularly relates to a ground extraction well body structure of a double-layer overlapped goaf and a recovery device.
Background
Along with the increase of the yield of coal, more and more coal working faces are closed due to the end of mining, a goaf is formed after the coal working faces are closed, residual coal, coal pillars and adjacent coal rock layers in the goaf are continuously desorbed and release gas, and the gas in the goaf sometimes leaks to other mining spaces due to the influence of factors such as the change of atmospheric pressure and poor sealing property of the goaf, so that the gas emission quantity of other working faces is increased, and the gas is abnormally discharged; in addition, the gas in the worked-out section can be dissipated into the atmosphere through a well mouth with poor sealing performance or even an earth surface crack, the global greenhouse effect is further intensified, the gas in the worked-out section can be extracted and utilized, the leakage of the gas in the worked-out section to an adjacent mining space can be reduced, the greenhouse effect caused by the dissipation of the gas in the worked-out section to the atmosphere is reduced, and considerable economic benefit can be obtained as clean energy; under the condition of coal seam group mining, the goafs of an upper coal seam and a lower coal seam are often overlapped, and aiming at the condition that a straight well is constructed on the ground and gas of a plurality of goafs is extracted, the purposes of one well with multiple purposes, economy and high efficiency can be achieved.
Disclosure of Invention
The invention provides a ground extraction well body structure of a double-layer overlapped goaf and a recovery device, aiming at solving the defects in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme: a ground extraction well structure and a recovery device of a double-layer overlapped goaf comprise a downhole structure and an uphole structure; the underground structure comprises a first drilled hole, a second drilled hole, a third drilled hole, a fourth drilled hole, a sleeve, a sieve pipe and a hanging short section which are arranged from top to bottom in sequence, wherein the sleeve, the sieve pipe and the hanging short section correspond to the first drilled hole, the second drilled hole, the third drilled hole and the fourth drilled hole, the sleeve, the sieve pipe and the hanging short section correspond to the second drilled hole, the underground structure sequentially penetrates through a surface unconsolidated layer, a bedrock layer, a aquifer, a fracture zone I, a goaf I and a fracture zone II from top to bottom, and the underground structure comprises a hanger, a gas transmission pipeline I, a flow meter I, a sampling port I, a gate valve I, a gas transmission pipeline II, a flow meter II, a sampling port II, a gate valve II and a vacuum pump; drilling a drill bit opening of the first drilling hole D425 into a bedrock for 5-20m to complete drilling, drilling a phi 377 surface casing pipe for well cementation, preventing earth surface clay from collapsing, drilling a drill bit opening of the second drilling hole D311.15, drilling after the last layer of water-containing layer on a coal seam I top plate is drilled, drilling a phi 273 casing pipe for well cementation, sealing an upper water-containing layer, pouring a concrete base at a wellhead to form a whole with second drilling well cementing concrete, reserving a sealing structure embedded part and an annulus extraction pipeline interface, drilling a drill bit of the third drilling hole D241, drilling a 219 casing pipe and an upper suspension nipple, enabling cement to return to a height of 1-4m above the phi goaf I, installing a hanger and sealing, preventing gas from escaping from the goaf I and a fracture zone I, drilling a drill bit of the quarto drilling hole D171, drilling a fracture zone II, drilling a phi 139.7 cutting seam under the suspension nipple, completing the open hole, and arranging a cutting seam at the fracture zone II of the quarto drilling hole; the second-opening casing and the third-opening casing are communicated with the goaf I and the fracture zone I and are extracted by a vacuum pump; the fracture zones II in the three-opening and four-opening sleeve are communicated and extracted by a vacuum pump; the hanger is arranged on the concrete base, a sealing gasket and a sealing embedded part are arranged between the hanger and the concrete base, a plurality of sealing screws are distributed on the surface of the hanger at equal intervals, screw threads are arranged in the middle of the hanger, the lower part of the hanger is connected with a three-opening sleeve, and two lifting rings which are symmetrically distributed are arranged on the surface of the hanger; the gas in the goaf I and the gas in the fractured zone I are extracted from a gas transmission pipeline I through a flowmeter I and a gate valve I through a vacuum pump, the sampling port I is arranged on the gas transmission pipeline I and is arranged between the flowmeter I and the gate valve I, the gas in the fractured zone II is extracted from the gas transmission pipeline II through a flowmeter II and a gate valve II through the vacuum pump, and the sampling port II is arranged on the gas transmission pipeline II and is arranged between the flowmeter II and the gate valve II.
Further, it is characterized in that: the number of the lifting rings is 2, the lifting rings are made of N80 steel grade materials and are symmetrically distributed.
Furthermore, the number of the sealing screws is 18, the sealing screws are made of N80 steel grade materials and are distributed on the circumference at equal intervals.
Furthermore, the length of the slots of the slotted sieve tube is 20mm, the width of the slots is 5mm, and the 90-degree phase angle interval is 100mm, and the number of the slots is 24 per meter.
Furthermore, the sealing embedded part is made of N80 steel and is integrally cast with the concrete base to form a whole.
Furthermore, the sealing member material is polyurethane rubber, and the round hole matches with the hanger screw position, is 18.
Furthermore, the upper hanging short section is formed by symmetrically welding clamping blocks at the lower part of the N80 casing pipe, so that the inner diameter is smaller than the maximum outer diameter of the lower hanging short section.
Furthermore, the lower hanging short section is formed by welding an annular clamping block outside the N80 casing pipe, so that the outer diameter of the lower hanging short section is larger than the inner drift diameter of the upper hanging short section.
By adopting the technical scheme, the invention has the beneficial effects that:
1. compared with the existing ground drilling of the single thick coal seam goaf, the same set of ground equipment is used for simultaneously extracting gas in two layers of goafs, so that the site, pipeline, extraction equipment and energy consumption cost are saved.
2. One ground extraction well achieves the extraction effect which can be achieved by two previous wells, and the construction cost of a single well is saved by nearly half.
3. The well body structure is matched with the hanger, the upper hanging short section and the lower hanging short section, and can recycle the three-opening casing pipe and the four-opening slotted screen pipe, thereby greatly saving well forming materials.
4. The hanger and the upper and lower hanging short sections are simple and convenient to manufacture, and can be repeatedly used after being recovered through threaded connection (the upper hanging short section is well-fixed and left in a well and cannot be recovered).
Drawings
FIG. 1 is a schematic structural diagram of a ground extraction well structure and a recovery device in a double-layer overlapped goaf;
fig. 2 is a schematic view of the hanger of the present invention.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further explained by combining the specific embodiments as follows:
example 1:
with reference to fig. 1 and 2: a ground extraction well structure and a recovery device of a double-layer overlapped goaf comprise an underground structure and an aboveground structure; the underground structure consists of a first drilled hole 1, a second drilled hole 2, a third drilled hole 3, a fourth drilled hole 4, a sleeve 5, a sieve pipe 6 and a hanging short joint 7 which are arranged from top to bottom in sequence, the sleeve 5, the sieve pipe 6 and the hanging short joint 7 correspond to each drilled hole, the underground structure sequentially penetrates through a surface unconsolidated formation, a basal rock formation, a water-bearing formation 13, a fracture zone I14, a goaf I15 and a fracture zone II16 from top to bottom, and the underground structure consists of a hanger 21, a gas transmission pipeline I22, a flowmeter I23, a sampling port I24, a gate valve I25, a gas transmission pipeline II26, a flowmeter II27, a sampling port II28, a gate valve II29 and a vacuum pump 30; the drill bit of the first drilling hole 1D425 is used for drilling a basement rock for 5m and completing drilling, a phi 377 surface casing pipe is used for well cementation, earth surface clay collapse is prevented, the drill bit of the second drilling hole 2D311.15 is used for drilling a final water-containing layer on a coal seam I top plate and completing drilling, a phi 273 casing pipe is used for well cementation, an upper water-containing layer is sealed, a concrete base 50 is poured at a wellhead to form a whole with well cementation concrete of the second drilling hole 2, a sealing structure embedded part and an annular extraction pipeline interface are reserved, the drill bit of the third drilling hole 3D241 is used for drilling a hole, a phi 219 casing pipe is used for well cementation with an upper suspension short section 7, cement is returned to a position 1m above a goaf I15 and is installed and sealed, a goaf I15 and a fracture zone I14 gas are prevented from escaping, the drill bit of the quarto drilling hole 4D171 is used for drilling, a crack with a screen pipe II16 is used for drilling a crack, a phi 139.7 cutting seam 6 with the lower suspension short section 7 is used for well cementation, an open hole is used for drilling, and a screen pipe fracture 40 is arranged at the position of the fracture zone II16 of the quarto cutting seam completion; the second-opening 2 and third-opening 3 casing pipe annuluses are communicated with a goaf I15 and a fracture zone I14, and are extracted by a vacuum pump 30; the fracture zones II16 in the three-opening 3 and four-opening 4 casing are communicated, and extraction is performed through a vacuum pump 30; the hanger 21 is arranged on the concrete base 50, a sealing gasket 60 and a sealing embedded part 70 are arranged between the hanger 21 and the concrete base 50, a plurality of sealing screws 80 are equidistantly distributed on the surface of the hanger 21, a screw thread 90 is arranged in the middle of the hanger 21, the lower part of the hanger 21 is connected with the three-opening casing 3, and two symmetrically distributed lifting rings 100 are arranged on the surface of the hanger 21; the gas in the goaf I15 and the fractured zone I14 is extracted from a gas transmission pipeline I22 through a flow meter I23 and a gate valve I25 by a vacuum pump 30, the sampling port I24 is arranged on the gas transmission pipeline I22 and between the flow meter I23 and the gate valve I25, the gas in the fractured zone II16 is extracted from a gas transmission pipeline II26 through a flow meter II27 and a gate valve II29 by the vacuum pump 30, and the sampling port II28 is arranged on the gas transmission pipeline II26 and between the flow meter II27 and the gate valve II 29.
Further, the number of the lifting ring 100 is 2, and the lifting ring is made of N80 steel grade materials and is symmetrically distributed.
Further, the number of the sealing screws 80 is 18, and the sealing screws are made of N80 steel grade materials and are distributed on the circumference at equal intervals.
Furthermore, the length of the slots of the slotted sieve tube is 20mm, the width of the slots is 5mm, and the 90-degree phase angle interval is 100mm, and the number of the slots is 24 per meter.
Further, the sealing embedded part 70 is made of N80 steel and is cast with the concrete base 50 into a whole.
Furthermore, the sealing member material is polyurethane rubber, and the round hole matches with the hanger screw position, is 18.
Furthermore, the upper hanging short section 7 is formed by symmetrically welding clamping blocks at the lower part of the N80 casing pipe, so that the inner diameter is smaller than the maximum outer diameter of the lower hanging short section 7.
Further, the lower hanging nipple 7 is formed by welding an annular clamping block outside the N80 casing pipe, so that the outer diameter of the lower hanging nipple is larger than the inner drift diameter of the upper hanging nipple 7.
Example 2:
with reference to fig. 1 and 2: a ground extraction well structure and a recovery device of a double-layer overlapped goaf comprise a downhole structure and an uphole structure; the underground structure consists of a first drilled hole 1, a second drilled hole 2, a third drilled hole 3, a fourth drilled hole 4, a sleeve 5, a sieve pipe 6 and a hanging short joint 7 which are arranged from top to bottom in sequence, the sleeve 5, the sieve pipe 6 and the hanging short joint 7 correspond to each drilled hole, the underground structure sequentially penetrates through a surface unconsolidated formation, a basal rock formation, a water-bearing formation 13, a fracture zone I14, a goaf I15 and a fracture zone II16 from top to bottom, and the underground structure consists of a hanger 21, a gas transmission pipeline I22, a flowmeter I23, a sampling port I24, a gate valve I25, a gas transmission pipeline II26, a flowmeter II27, a sampling port II28, a gate valve II29 and a vacuum pump 30; the drill bit of the first drilling hole 1D425 is used for drilling a hole, 10m of the drill bit is drilled into a bedrock, a phi 377 surface casing pipe is put for well cementation to prevent earth surface clay from collapsing, the drill bit of the second drilling hole 2D311.15 is used for drilling a hole, the drill bit is used for drilling the last layer of water-containing layer on the coal seam I top plate and is used for well cementation, a phi 273 casing pipe is put for well cementation to seal the upper water-containing layer, a concrete base 50 is poured at the wellhead to form a whole with the second drilling hole 2 well cementation concrete, a sealing structure embedded part and an annular extraction pipeline interface are reserved, the drill bit of the third drilling hole 3D241 is used for drilling a hole, a 219 casing pipe is put into the upper suspension nipple 7 for well cementation, cement returns to a height of 2m above the phi mining area I15 and is installed and sealed to prevent the goaf I15 and a fracture zone I14 gas from escaping, the drill bit of the quarto drilling hole 4D171 and is used for drilling a fracture zone II16 and then is used for drilling a fracture zone II16, a cutting seam 6 with a cutting seam of a drilling hole 6 with a phi 139.7 under the open hole and a screen pipe 6 with a completion zone II 16; the second-opening 2 and third-opening 3 casing annuluses are communicated with a gob I15 and a fracture zone I14 and are extracted by a vacuum pump 30; the fracture zones II16 in the three-opening 3 and four-opening 4 casing are communicated, and extraction is performed through a vacuum pump 30; the hanger 21 is arranged on the concrete base 50, a sealing gasket 60 and a sealing embedded part 70 are arranged between the hanger 21 and the concrete base 50, a plurality of sealing screws 80 are equidistantly distributed on the surface of the hanger 21, a screw thread 90 is arranged in the middle of the hanger 21, the lower part of the hanger 21 is connected with the three-opening casing 3, and two symmetrically distributed lifting rings 100 are arranged on the surface of the hanger 21; the gas in the goaf I15 and the fractured zone I14 is extracted from a gas transmission pipeline I22 through a flow meter I23 and a gate valve I25 by a vacuum pump 30, the sampling port I24 is arranged on the gas transmission pipeline I22 and between the flow meter I23 and the gate valve I25, the gas in the fractured zone II16 is extracted from a gas transmission pipeline II26 through a flow meter II27 and a gate valve II29 by the vacuum pump 30, and the sampling port II28 is arranged on the gas transmission pipeline II26 and between the flow meter II27 and the gate valve II 29.
Further, the number of the lifting ring 100 is 2, and the lifting ring is made of N80 steel grade materials and is symmetrically distributed.
Further, the number of the sealing screws 80 is 18, and the sealing screws are made of N80 steel grade materials and are distributed on the circumference at equal intervals.
Furthermore, the length of the slots of the slotted screen pipe is 20mm, the width of the slots is 5mm, and the 90-degree phase angles are arranged at intervals of 100mm and are 24 slots per meter.
Further, the sealing embedded part 70 is made of N80 steel and is cast with the concrete base 50 into a whole.
Furthermore, the sealing member material is polyurethane rubber, and the round hole matches with the hanger screw position, is 18.
Furthermore, the upper hanging short section 7 is formed by symmetrically welding fixture blocks at the lower part of the N80 casing pipe, so that the inner diameter is smaller than the maximum outer diameter of the lower hanging short section 7.
Furthermore, the lower hanging short section 7 is an annular clamping block welded outside the N80 casing pipe, and the outer diameter of the lower hanging short section is larger than the inner drift diameter of the upper hanging short section 7.
Example 3:
with reference to fig. 1 and 2: a ground extraction well structure and a recovery device of a double-layer overlapped goaf comprise a downhole structure and an uphole structure; the underground structure consists of a first drilled hole 1, a second drilled hole 2, a third drilled hole 3, a fourth drilled hole 4, a sleeve 5, a sieve pipe 6 and a hanging short joint 7 which are arranged from top to bottom in sequence, the sleeve 5, the sieve pipe 6 and the hanging short joint 7 correspond to each drilled hole, the underground structure sequentially penetrates through a surface unconsolidated formation, a basal rock formation, a water-bearing formation 13, a fracture zone I14, a goaf I15 and a fracture zone II16 from top to bottom, and the underground structure consists of a hanger 21, a gas transmission pipeline I22, a flowmeter I23, a sampling port I24, a gate valve I25, a gas transmission pipeline II26, a flowmeter II27, a sampling port II28, a gate valve II29 and a vacuum pump 30; drilling a drill bit opening of the first drilled hole 1D425, drilling a bedrock 15m completely, drilling a phi 377 surface casing pipe for well cementation, preventing earth surface clay from collapsing, drilling a drill bit opening of the second drilled hole 2D311.15, drilling a final layer of water-containing layer on a coal seam I top plate completely, drilling a phi 273 casing pipe for well cementation, sealing an upper water-containing layer, pouring a concrete base 50 on a wellhead to form a whole with second drilled hole 2 well cementation concrete, reserving a sealing structure embedded part and an annular extraction pipeline interface, drilling a drill bit opening of the third drilled hole 3D241, drilling a 219 casing pipe and an upper suspension nipple 7 for well cementation, returning cement to a position 3m above the phi 15 of the mined out area, installing a hanger and sealing, preventing gas from escaping from the I15 of the mined out area and a fracture zone I14, drilling a drill bit of the quarto drilled hole 4D171, drilling a fracture zone II16, drilling a phi 139.7 cutting joint 6 and a screen pipe 6 hung below the quarto cutting zone II16, and setting a completion seam 40 at the position of the open hole II cutting zone II 16; the second-opening 2 and third-opening 3 casing pipe annuluses are communicated with a goaf I15 and a fracture zone I14, and are extracted by a vacuum pump 30; the fracture zones II16 in the three-opening 3 and four-opening 4 sleeve are communicated and extracted by a vacuum pump 30; the hanger 21 is arranged on the concrete base 50, a sealing gasket 60 and a sealing embedded part 70 are arranged between the hanger 21 and the concrete base 50, a plurality of sealing screws 80 are equidistantly distributed on the surface of the hanger 21, a screw thread 90 is arranged in the middle of the hanger 21, the lower part of the hanger 21 is connected with the three-opening casing 3, and two symmetrically distributed lifting rings 100 are arranged on the surface of the hanger 21; the gas in the goaf I15 and the fractured zone I14 is extracted from a gas transmission pipeline I22 through a flow meter I23 and a gate valve I25 by a vacuum pump 30, the sampling port I24 is arranged on the gas transmission pipeline I22 and between the flow meter I23 and the gate valve I25, the gas in the fractured zone II16 is extracted from a gas transmission pipeline II26 through a flow meter II27 and a gate valve II29 by the vacuum pump 30, and the sampling port II28 is arranged on the gas transmission pipeline II26 and between the flow meter II27 and the gate valve II 29.
Further, the number of the lift ring 100 is 2, and the lift ring is made of N80 steel grade material and is symmetrically distributed.
Furthermore, the number of the sealing screws 80 is 18, and the sealing screws are made of N80 steel grade materials and are distributed on the circumference at equal intervals.
Furthermore, the length of the slots of the slotted sieve tube is 20mm, the width of the slots is 5mm, and the 90-degree phase angle interval is 100mm, and the number of the slots is 24 per meter.
Further, the sealing embedded part 70 is made of N80 steel and is cast with the concrete base 50 into a whole.
Furthermore, the sealing member material is polyurethane rubber, and the round hole matches with the hanger screw position, is 18.
Furthermore, the upper hanging short section 7 is formed by symmetrically welding fixture blocks at the lower part of the N80 casing pipe, so that the inner diameter is smaller than the maximum outer diameter of the lower hanging short section 7.
Furthermore, the lower hanging short section 7 is an annular clamping block welded outside the N80 casing pipe, and the outer diameter of the lower hanging short section is larger than the inner drift diameter of the upper hanging short section 7.
Example 4:
with reference to fig. 1 and 2: a ground extraction well structure and a recovery device of a double-layer overlapped goaf comprise a downhole structure and an uphole structure; the underground structure consists of a first drilled hole 1, a second drilled hole 2, a third drilled hole 3, a fourth drilled hole 4, a sleeve 5, a sieve pipe 6 and a hanging short joint 7 which are arranged from top to bottom in sequence, the sleeve 5, the sieve pipe 6 and the hanging short joint 7 correspond to each drilled hole, the underground structure sequentially penetrates through a surface unconsolidated formation, a basal rock formation, a water-bearing formation 13, a fracture zone I14, a goaf I15 and a fracture zone II16 from top to bottom, and the underground structure consists of a hanger 21, a gas transmission pipeline I22, a flowmeter I23, a sampling port I24, a gate valve I25, a gas transmission pipeline II26, a flowmeter II27, a sampling port II28, a gate valve II29 and a vacuum pump 30; drilling a drill bit opening of the first drilled hole 1D425 by 20m into a bedrock, drilling a surface casing of phi 377, preventing earth surface clay from collapsing, drilling a drill bit opening of the second drilled hole 2D311.15, drilling after the last layer of water-containing layer on a coal seam I top plate is drilled, drilling a phi 273 casing, sealing an upper water-containing layer, pouring a concrete base 50 on a wellhead to form a whole with the second drilled hole 2 well cementing concrete, reserving a sealing structure embedded part and an annular extraction pipeline interface, drilling a drill bit of the third drilled hole 3D241, drilling a 219 casing and an upper suspension nipple 7 for cementing, returning cement to a position 4m above the phi 15 of the mined out area, installing a hanger and sealing, preventing the mined out area I15 and a fracture zone I14 gas from escaping, drilling a drill bit of the quarto drilled hole 4D171, drilling a fracture zone II16, drilling a cutting seam 139.7 cutting seam 6 and a screen pipe 6 suspended below the quarto cutting seam II16, and setting a completion seam 40 at the position of the quarto cutting seam II 16; the second-opening 2 and third-opening 3 casing pipe annuluses are communicated with a goaf I15 and a fracture zone I14, and are extracted by a vacuum pump 30; the fracture zones II16 in the three-opening 3 and four-opening 4 sleeve are communicated and extracted by a vacuum pump 30; the hanger 21 is arranged on the concrete base 50, a sealing gasket 60 and a sealing embedded part 70 are arranged between the hanger 21 and the concrete base 50, a plurality of sealing screws 80 are equidistantly distributed on the surface of the hanger 21, a screw thread 90 is arranged in the middle of the hanger 21, the lower part of the hanger 21 is connected with the three-opening casing 3, and two symmetrically distributed lifting rings 100 are arranged on the surface of the hanger 21; the gas in the goaf I15 and the fractured zone I14 is extracted from a gas transmission pipeline I22 through a flow meter I23 and a gate valve I25 by a vacuum pump 30, the sampling port I24 is arranged on the gas transmission pipeline I22 and between the flow meter I23 and the gate valve I25, the gas in the fractured zone II16 is extracted from a gas transmission pipeline II26 through a flow meter II27 and a gate valve II29 by the vacuum pump 30, and the sampling port II28 is arranged on the gas transmission pipeline II26 and between the flow meter II27 and the gate valve II 29.
Further, the number of the lift ring 100 is 2, and the lift ring is made of N80 steel grade material and is symmetrically distributed.
Furthermore, the number of the sealing screws 80 is 18, and the sealing screws are made of N80 steel grade materials and are distributed on the circumference at equal intervals.
Furthermore, the length of the slots of the slotted sieve tube is 20mm, the width of the slots is 5mm, and the 90-degree phase angle interval is 100mm, and the number of the slots is 24 per meter.
Further, the sealing embedded part 70 is made of N80 steel and is cast with the concrete base 50 into a whole.
Furthermore, the sealing member material is polyurethane rubber, and the round hole matches with the hanger screw position, is 18.
Furthermore, the upper hanging short section 7 is formed by symmetrically welding clamping blocks at the lower part of the N80 casing pipe, so that the inner diameter is smaller than the maximum outer diameter of the lower hanging short section 7.
Further, the lower hanging nipple 7 is formed by welding an annular clamping block outside the N80 casing pipe, so that the outer diameter of the lower hanging nipple is larger than the inner drift diameter of the upper hanging nipple 7.
The present embodiment is not intended to limit the shape, material, structure, etc. of the present invention in any way, and any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention are within the scope of the technical solution of the present invention.
Claims (8)
1. The utility model provides a double-deck overlapping goaf ground drainage shaft structure and recovery unit which characterized in that: comprises a downhole structure and an uphole structure; the underground structure comprises a first drilled hole, a second drilled hole, a third drilled hole, a fourth drilled hole, a sleeve, a sieve pipe and a hanging short section which are arranged from top to bottom in sequence, wherein the sleeve, the sieve pipe and the hanging short section correspond to the first drilled hole, the second drilled hole, the third drilled hole and the fourth drilled hole, the sleeve, the sieve pipe and the hanging short section correspond to the second drilled hole, the underground structure sequentially penetrates through a surface unconsolidated layer, a bedrock layer, a aquifer, a fracture zone I, a goaf I and a fracture zone II from top to bottom, and the underground structure comprises a hanger, a gas transmission pipeline I, a flow meter I, a sampling port I, a gate valve I, a gas transmission pipeline II, a flow meter II, a sampling port II, a gate valve II and a vacuum pump; the drill bit of the first drilling hole D425 drills a hole 5-20m into a bedrock and then drills a surface casing of phi 377 to fix a well and prevent earth surface clay from collapsing, the drill bit of the second drilling hole D311.15 drills a hole after drilling the last layer of water-containing layer on the top plate of the coal seam I, the drill bit of the third drilling hole D241 drills a hole, the drill bit of the third drilling hole D219 drills a casing and an upper suspension nipple to fix a well and seal the upper water-containing layer, a concrete base is poured at a wellhead to form a whole with the well fixing concrete of the second drilling hole, a sealing structure embedded part and an annular extraction pipeline interface are reserved, cement returns to a position 1-4m above the goaf I, a hanger is installed and sealed to prevent gas from escaping from the goaf I and the fracture zone I, the drill bit of the quarto drilling hole D171 drills a well and drills a finished well after drilling zone II, a cutting seam of phi 139.7 of the lower suspension nipple is drilled, a screen hole is opened, and a cutting seam is arranged at the fracture zone II of the screen pipe; the second-opening casing and the third-opening casing are communicated with the goaf I and the fracture zone I and are extracted by a vacuum pump; fracture zones II in the three-opening and four-opening casing pipe are communicated and extracted by a vacuum pump; the hanger is arranged on the concrete base, a sealing gasket and a sealing embedded part are arranged between the hanger and the concrete base, a plurality of sealing screws are distributed on the surface of the hanger at equal intervals, screw threads are arranged in the middle of the hanger, the lower part of the hanger is connected with a three-opening sleeve, and two lifting rings which are symmetrically distributed are arranged on the surface of the hanger; the gas in the goaf I and the gas in the fractured zone I are extracted from a gas transmission pipeline I through a flowmeter I and a gate valve I through a vacuum pump, the sampling port I is arranged on the gas transmission pipeline I and is arranged between the flowmeter I and the gate valve I, the gas in the fractured zone II is extracted from the gas transmission pipeline II through a flowmeter II and a gate valve II through the vacuum pump, and the sampling port II is arranged on the gas transmission pipeline II and is arranged between the flowmeter II and the gate valve II.
2. The ground extraction well structure and recovery device of the double-layer overlapped goaf according to claim 1, characterized in that: the number of the lifting rings is 2, the lifting rings are made of N80 steel grade materials and are symmetrically distributed.
3. The ground extraction well structure and recovery device for the double-layer overlapped goaf according to claim 1, characterized in that: the number of the sealing screws is 18, the sealing screws are made of N80 steel grade materials and are distributed on the circumference at equal intervals.
4. The ground extraction well structure and recovery device of the double-layer overlapped goaf according to claim 1, characterized in that: the length of the slots of the slotted sieve tube is 20mm, the width of the slots is 5mm, the 90-degree phase angles are arranged at intervals of 100mm, and the number of the slots is 24 per meter.
5. The ground extraction well structure and recovery device of the double-layer overlapped goaf according to claim 1, characterized in that: the sealing embedded part is made of N80 steel and is cast with the concrete base into a whole.
6. The ground extraction well structure and recovery device of the double-layer overlapped goaf according to claim 1, characterized in that: the sealing gasket material is polyurethane rubber, and the round hole matches with the hanger screw position, is 18.
7. The ground extraction well structure and recovery device for the double-layer overlapped goaf according to claim 1, characterized in that: the upper hanging short section is formed by symmetrically welding clamping blocks at the lower part of the N80 casing pipe, so that the inner diameter is smaller than the maximum outer diameter of the lower hanging short section.
8. The ground extraction well structure and recovery device for the double-layer overlapped goaf according to claim 1, characterized in that: the lower hanging short section is formed by welding an annular fixture block outside the N80 casing pipe, so that the outer diameter of the lower hanging short section is larger than the inner drift diameter of the upper hanging short section.
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| CN112879078A (en) * | 2021-01-28 | 2021-06-01 | 中煤科工集团重庆研究院有限公司 | Method for pre-pumping original coal seam and extracting gas from ground well of goaf |
| CN112796712B (en) * | 2021-03-26 | 2022-07-26 | 山西省煤炭地质勘查研究院 | Comprehensive extraction method for fracturing of goaf and coal seam |
| CN113863895A (en) * | 2021-04-30 | 2021-12-31 | 中国矿业大学 | Well body structure of oil and gas well penetrating through recoverable coal seam and construction method |
| CN114233368B (en) * | 2021-12-28 | 2023-10-13 | 山西晋煤集团技术研究院有限责任公司 | Method for treating harmful gas leakage in overlying goaf |
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