CN101915063B - Ground well casing capable of preventing mining damage - Google Patents
Ground well casing capable of preventing mining damage Download PDFInfo
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- CN101915063B CN101915063B CN 201010244456 CN201010244456A CN101915063B CN 101915063 B CN101915063 B CN 101915063B CN 201010244456 CN201010244456 CN 201010244456 CN 201010244456 A CN201010244456 A CN 201010244456A CN 101915063 B CN101915063 B CN 101915063B
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- adapting pipe
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- well casing
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- 230000006378 damage Effects 0.000 title claims abstract description 18
- 238000005065 mining Methods 0.000 title abstract description 14
- 210000004907 gland Anatomy 0.000 claims description 11
- 230000007246 mechanism Effects 0.000 claims description 9
- 238000007789 sealing Methods 0.000 claims description 6
- 239000000428 dust Substances 0.000 claims description 3
- 238000006073 displacement reaction Methods 0.000 abstract description 14
- 238000000605 extraction Methods 0.000 abstract description 6
- 239000011435 rock Substances 0.000 description 20
- 239000003245 coal Substances 0.000 description 19
- 238000005553 drilling Methods 0.000 description 15
- 230000000694 effects Effects 0.000 description 8
- 230000006835 compression Effects 0.000 description 7
- 238000007906 compression Methods 0.000 description 7
- 238000005086 pumping Methods 0.000 description 7
- 239000010410 layer Substances 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000005452 bending Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000004062 sedimentation Methods 0.000 description 3
- 238000010008 shearing Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 239000011229 interlayer Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 208000015181 infectious disease Diseases 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
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Abstract
The invention discloses a ground well casing capable of preventing mining damage, which comprises at least two casing bodies, a deflection joint and an expansion joint, adjacent casing bodies are connected by the deflection joint or the expansion joint, when in use, according to analysis results of strata displacement, the casing bodies are connected by the deflection joint in the depth corresponding to strata where the casing is easy to cut and twist, the casing bodies are connected by the expansion joint in the depth corresponding to strata where the casing is easy to pull and press, and the casing bodies are connected after the deflection joint and the expansion joint are connected in series in a small depth range corresponding to strata where the casing is easy to not only cut and twist but also pull and press, so that the casing can adapt to strata variation, thus reducing damage accidents of the well casing and guaranteeing smooth gas extraction through the ground well.
Description
Technical field
The present invention relates to be used in the ground drilling construction sleeve pipe of well cementation, particularly a kind of flexible ground well drilling and cementing sleeve pipe that prevents strata movement and be damaged.
Background technology
In down-hole coal bed recovery process, its rear will form discharge space, form successively caving zone, fissure zone and bending subsidence band in its vertical direction.Ground well drainage Coal Seams on Infection Zones of Coal Mining gas technology at first before unmind in the coal seam, in advance from ground to the working seam drilling well of constructing, and cement the well, completion; Then by working seam, make and cover coal petrography and be subjected to the underlying seam mining effect vertically forming " perpendicular three bands ", form the circulation passage of CMM Surface Well Drilling.In mining active process, the source of gas pressure relief mainly contains mined bed coal seam gas pressure relief and proximity interference layer gas pressure relief two classes: 1. when seam mining, the coal breakage at work plane the place ahead coal body, both sides rib and rear is subjected to the mining influence desorption of methane, this part gas can by larger space between the inbreak rock stratum earthward drilling well flow; 2. the coal seam in the mining effect scope is subjected to mining influence and produces gas pressure relief, be positioned at the fissure zone coal seam exist be convenient to that coal bed gas flows disrumpent feelings crack, for pouring in the goaf, the adjacent layer gas pressure relief that is in this layer position provides flow channel, be positioned at coal rock layer formation opening property of the absciss layer crack of bending subsidence band, also the lateral flow for gas provides passage.Along with the extraction of ground drilling, the gas pressure relief in this coal-bed gas and mining effect scope enters drilling well by multiple passage under the extraction suction function of ground drilling, realizes the pressure relief gas pumping mining in coal seam in working seam and influence basin.
Ground well drainage mining influence district gas is applicable to the coal seam reservoirs poor permeability, and the coal seam that air content is high is particularly suitable for the gas pumping under the coal seam group condition.Therefore, in numerous gas pumping technology, ground well drainage mining influence district gas pressure relief technology has become the developing direction in this field.
By analyzing the stress of overlying strata body before and after adopting on the coal seam, drawing overburden of the goaf pushes through at work plane and moves forward and backward direction and can change: when work plane pushes away when near, move to the work plane direction, when work plane pushes through, can move to advance of the face direction again.Bury when darker when the rock stratum, easily produce the residual level displacement.Under the seam mining impact, larger horizontal changing of the relative positions slippage and vertical bed separation displacement very easily occur in the rock stratum interface that intensity difference is larger, and then causing this regional ground drilling pit shaft to be sheared destruction or tensile failure, rock strength sudden change place is namely the danger position of ground drilling well shaft destroyed.Push away near procedure at work plane, the displacement at interface place, rock stratum presents the trend that repeatedly changes, the strata movement process makes the repeated action of the many kinds of forces such as the extraction bored shaft is sheared, tension and compression, torsion, the destruction that causes well casing can not be often single cut-out or break pattern, and shaft structure must have the application life of powerful, more comprehensive anti-damage performance guarantee extraction drilling well.Enough under dark condition, after work plane pushed through, direction of displacement finally showed uniformity: wherein, interlayer horizontal sliding direction is consistent with advance of the face direction for buried depth, and interlayer vertical displacement direction is consistent with the deadweight direction, has namely produced sedimentation.
In prior art, the ground drilling well cementing casing pipe is integral structure normally, through above-mentioned analysis as can be known, under the condition that Strata Overlying The Seam frequently is subjected to displacement, the repeated action of the many kinds of forces such as the sleeve pipe of this structure will be sheared, tension and compression, torsion, very easily be damaged, affect the smooth extraction of gas.
Therefore, need to explore a kind of ground drilling well cementing casing pipe, make it can adapt to the situation that top, coal seam rock stratum changes, improve the well casing survivability, extend the application life of drilling well, ensure carrying out smoothly of gas pumping.
Summary of the invention
In view of this, the invention provides a kind of ground well casing of preventing adopting damage, its objective is: adapt to the situation that top, coal seam rock stratum is subjected to displacement under various operating modes, improve the well casing survivability, reduce the ground drilling malicious event, ensure carrying out smoothly of gas pumping.
The ground well casing of preventing adopting damage of the present invention comprises body, deflected joint and expansion joint, and described body is at least three sections, connects by deflected joint or expansion joint between adjacent body.
Further, described deflected joint comprises that an end is that the adapting pipe I of outer spherical structure, adapting pipe II and the end that an end is interior hemispherical dome structure are the gland of interior hemispherical dome structure, described gland and adapting pipe II are fixedly connected to form a spherical cavity removably, and the outer spherical structure of adapting pipe I stretches into and forms spherical hinge structure in spherical cavity;
Further, between the outer spherical structure of the interior hemispherical dome structure of described adapting pipe II and adapting pipe I, between the outer spherical structure of the interior hemispherical dome structure of gland and adapting pipe I, O-ring seals is set all;
Further, described expansion joint comprises outer adapting pipe and interior adapting pipe, and described interior adapting pipe stretches in outer adapting pipe in the mode that is slidably matched, and is provided for limiting the lockable mechanism of both relative slidings between interior adapting pipe and outer adapting pipe;
Further, described interior adapting pipe stretches on the cylindrical of outer adapting pipe one end circumferential step is set, described expansion joint also comprises the fairlead that is coated at interior adapting pipe and is fixedly connected with removably with outer adapting pipe, fairlead, outer adapting pipe inwall, interior adapting pipe outer wall and step surround confined space jointly, be filled with hydraulic medium in confined space, accept relief valve being set on tube wall forming lockable mechanism in described;
Further, described lockable mechanism for radially run through outer accept tube wall and in accept the safety pin of tube wall;
Further, being slidably matched of described outer adapting pipe and interior adapting pipe arranges the sealing ring I between face;
Further, being slidably matched of described fairlead and interior adapting pipe arranges sealing ring II and dust ring between face.
the beneficial effect of the invention: the ground well casing of preventing adopting damage of the present invention, comprise body, deflected joint and expansion joint, described body is at least three sections, connect by deflected joint or expansion joint between adjacent body, during use, according to the analysis result to the strata displacement situation, use deflected joint that body is connected easily causing sleeve pipe to be sheared with the degree of depth corresponding to the rock stratum of being connected, easily causing sleeve pipe to be subjected to the degree of depth corresponding to rock stratum of tension and compression to use expansion joint that body is connected, both sleeve pipe was being caused shearing, reverse, again to sleeve pipe cause tension and compression the corresponding degree of depth in rock stratum among a small circle in, after adopting simultaneously deflected joint to be connected with expansion joint, body is connected, so that sleeve pipe adapts to the variation of rock stratum, reduce the ground well casing damage accident, ensure carrying out smoothly of gas pumping.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples.
Fig. 1 is structural representation of the present invention;
Fig. 2 is the structural representation of expansion joint in the embodiment of the present invention 2.
The specific embodiment
Embodiment 1:
Fig. 1 is structural representation of the present invention, as shown in the figure: the ground well casing of preventing adopting damage of the present embodiment, comprise body 1, deflected joint and expansion joint, described body 1 is at least three sections, the present embodiment adopts three sections bodys, from top to bottom be connected by expansion joint between first paragraph body and second segment body, be connected by deflected joint between second segment body and the 3rd section body, according to the analysis result to the strata displacement situation, deflected joint is arranged on the rock stratum is subjected to displacement meeting to the corresponding degree of depth of well casing generation shearing and twisting action, expansion joint is arranged on the rock stratum is subjected to displacement meeting to the corresponding degree of depth of well casing generation tension and compression effect, sleeve pipe movement with the rock stratum under the effect of deflected joint and expansion joint is offset, reverse, elongate or compression, be not damaged with protective casing, reduce the ground well casing damage accident, ensure carrying out smoothly of gas pumping.Certainly; both sleeve pipe was being caused shearing, was reversing, the rock stratum of again sleeve pipe being caused tension and compression, also can adopt the corresponding degree of depth among a small circle in; after adopting simultaneously deflected joint to be connected with expansion joint, body is connected, can reach the purpose that protective casing is not damaged equally.
in the present embodiment, described deflected joint comprises that an end is the adapting pipe I 2 of outer spherical structure, one end is the adapting pipe II 3 of interior hemispherical dome structure and the gland 4 that an end is interior hemispherical dome structure, described gland 4 is bolted to connection with adapting pipe II 3 and forms a spherical cavity, hinged by spherical structure and spherical cavity between adapting pipe I 2 and adapting pipe II 3, to form the spherical hinge structure that can reverse with bending, for the spherical structure of realizing the adapting pipe I can put into spherical cavity and with its formation spherical hinge structure, should be first the spherical structure of adapting pipe I be coordinated with the interior hemispherical dome structure of adapting pipe II, the interior hemispherical dome structure of gland is coordinated with the spherical structure of adapting pipe I, by bolt, gland is connected with the adapting pipe II at last.
In the present embodiment, between the interior hemispherical dome structure of described adapting pipe II 3 and the outer spherical structure of adapting pipe I 2, O-ring seals 5 is set, between the interior hemispherical dome structure of described gland 4 and the outer spherical structure of adapting pipe I 2, O-ring seals 5 is set, to prevent that water mud and water from entering the ball pivot fitting face and affecting its function.
in the present embodiment, described expansion joint comprises outer adapting pipe 6 and interior adapting pipe 7, described interior adapting pipe 7 stretches in outer adapting pipe 6 in the mode that is slidably matched, be provided for limiting the lockable mechanism of both relative slidings between interior adapting pipe 7 and outer adapting pipe 6, described lockable mechanism is for radially running through the safety pin 10 of outer adapting pipe 6 walls and interior adapting pipe 7 walls, under the effect of safety pin, sleeve pipe is unlikely to because of the deadweight of below body, sleeve pipe to be stretched when mounted, when the displacement of the vertical direction such as sedimentation occurs when the rock stratum, safety pin lost efficacy under the contractility effect between adapting pipe and interior adapting pipe outside, make sleeve pipe can follow the movement of rock stratum and stretch.
In the present embodiment, being slidably matched of described outer adapting pipe 6 and interior adapting pipe 7 arranges sealing ring I 11 between face, being slidably matched of described fairlead 8 and interior adapting pipe 7 arranges sealing ring II 12 and dust ring 13 between face, to prevent water mud and water from entering in outer adapting pipe and interior adapting pipe relative sliding required space, expansion joint was lost efficacy.
Embodiment 2:
Fig. 2 is the structural representation of expansion joint in the embodiment of the present invention 2, as shown in the figure: the preventing of the present embodiment adopted in the ground well casing that damages, described interior adapting pipe 7 stretches on the cylindrical of outer adapting pipe 6 one ends circumferential step 7a is set, described expansion joint also comprises the fairlead 8 that is coated at interior adapting pipe 7 and is fixedly connected with in the mode that is threaded with outer adapting pipe 6, fairlead 8, outer adapting pipe 6 inwalls, interior adapting pipe 7 outer walls and step 7a surround confined space jointly, be filled with hydraulic medium in confined space, the relief valve 9 that is communicated with confined space and the external world is set on described interior adapting pipe 7 walls forms lockable mechanisms, except the lockable mechanism that adopts the relief valve formula, all the other are all identical with embodiment 1 structure, during use, make and be full of hydraulic medium in confined space, under the effect of hydraulic coupling, sleeve pipe is unlikely to because of the deadweight of below body, sleeve pipe to be stretched when mounted, when the displacement of the vertical direction such as sedimentation occurs when the rock stratum, between outer adapting pipe and interior adapting pipe, the trend of relative sliding increases the pressure that pressure limiting valve is subject to, when pressure increases to certain value, pressure limiting valve is opened, make sleeve pipe can follow the movement of rock stratum and stretch.
Explanation is at last, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although with reference to preferred embodiment, the present invention is had been described in detail, those of ordinary skill in the art is to be understood that, can modify or be equal to replacement technical scheme of the present invention, and not breaking away from aim and the scope of technical solution of the present invention, it all should be encompassed in the middle of claim scope of the present invention.
Claims (5)
1. can prevent adopting the ground well casing that damages for one kind, it is characterized in that: comprise body (1), deflected joint and expansion joint, described body (1) is at least three sections, connects by deflected joint or expansion joint between adjacent body (1); Described expansion joint comprises outer adapting pipe (6) and interior adapting pipe (7), described interior adapting pipe (7) stretches in outer adapting pipe (6) in the mode that is slidably matched, and is provided for limiting the lockable mechanism of both relative slidings between interior adapting pipe (7) and outer adapting pipe (6); Described interior adapting pipe (7) stretches on the cylindrical of outer adapting pipe (6) one ends circumferential step (7a) is set, described expansion joint also comprises the fairlead (8) that is coated at interior adapting pipe (7) and is fixedly connected with removably with outer adapting pipe (6), fairlead (8), outer adapting pipe (6) inwall, interior adapting pipe (7) outer wall and step (7a) surround confined space jointly, be filled with hydraulic medium in confined space, relief valve (9) be set on described interior adapting pipe (7) wall form lockable mechanism.
2. according to claim 1ly prevent adopting the ground well casing that damages, it is characterized in that: described deflected joint comprises that an end is the gland (4) that the adapting pipe I (2) of outer spherical structure, adapting pipe II (3) that an end is interior hemispherical dome structure and an end are interior hemispherical dome structure, described gland (4) is fixedly connected to form a spherical cavity removably with adapting pipe II (3), and the outer spherical structure of adapting pipe I (2) stretches into and forms spherical hinge structure in spherical cavity.
3. according to claim 2ly prevent adopting the ground well casing that damages, it is characterized in that: between the outer spherical structure of the interior hemispherical dome structure of described adapting pipe II (3) and adapting pipe I (2), between the outer spherical structure of the interior hemispherical dome structure of gland (4) and adapting pipe I (2), O-ring seals (5) is set all.
4. according to claim 1ly prevent adopting the ground well casing that damages, it is characterized in that: being slidably matched of described outer adapting pipe (6) and interior adapting pipe (7) arranges sealing ring I (11) between face.
5. according to claim 4ly prevent adopting the ground well casing that damages, it is characterized in that: being slidably matched of described fairlead (8) and interior adapting pipe (7) arranges sealing ring II (12) and dust ring (13) between face.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010244456 CN101915063B (en) | 2010-08-04 | 2010-08-04 | Ground well casing capable of preventing mining damage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010244456 CN101915063B (en) | 2010-08-04 | 2010-08-04 | Ground well casing capable of preventing mining damage |
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| Publication Number | Publication Date |
|---|---|
| CN101915063A CN101915063A (en) | 2010-12-15 |
| CN101915063B true CN101915063B (en) | 2013-11-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201010244456 Active CN101915063B (en) | 2010-08-04 | 2010-08-04 | Ground well casing capable of preventing mining damage |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111946390B (en) * | 2020-09-15 | 2024-08-30 | 中勘资源勘探科技股份有限公司 | Movable orifice device of ground gas extraction well in coal mining area and use method |
| CN112796680B (en) * | 2021-01-04 | 2022-05-03 | 中煤科工集团重庆研究院有限公司 | Suspension installation method for protecting casing pipe of pre-pumping ground well to mining well |
| CN112963126A (en) * | 2021-03-26 | 2021-06-15 | 中勘资源勘探科技股份有限公司 | Coal mine mining area ground gas extraction well expansion device and use method |
| CN114000834A (en) * | 2021-10-22 | 2022-02-01 | 中勘资源勘探科技股份有限公司 | Coal mine mining area ground gas extraction well expansion device and use method thereof |
| CN114293926A (en) * | 2022-01-12 | 2022-04-08 | 淮北工业建筑设计院有限责任公司 | Anti-breaking well protection pipe |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5566772A (en) * | 1995-03-24 | 1996-10-22 | Davis-Lynch, Inc. | Telescoping casing joint for landing a casting string in a well bore |
| CN2430535Y (en) * | 2000-03-31 | 2001-05-16 | 徐州工程机械集团有限公司徐州工程机械研究所 | Multiple section self locking telescopic drill rod |
| CN2641267Y (en) * | 2003-07-24 | 2004-09-15 | 辽河石油勘探局曙光工程技术处 | Ball head shaped, hanging type jointing hoop |
| CN201738824U (en) * | 2010-08-04 | 2011-02-09 | 煤炭科学研究总院重庆研究院 | Ground drilling casing capable of preventing mining damage |
-
2010
- 2010-08-04 CN CN 201010244456 patent/CN101915063B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5566772A (en) * | 1995-03-24 | 1996-10-22 | Davis-Lynch, Inc. | Telescoping casing joint for landing a casting string in a well bore |
| CN2430535Y (en) * | 2000-03-31 | 2001-05-16 | 徐州工程机械集团有限公司徐州工程机械研究所 | Multiple section self locking telescopic drill rod |
| CN2641267Y (en) * | 2003-07-24 | 2004-09-15 | 辽河石油勘探局曙光工程技术处 | Ball head shaped, hanging type jointing hoop |
| CN201738824U (en) * | 2010-08-04 | 2011-02-09 | 煤炭科学研究总院重庆研究院 | Ground drilling casing capable of preventing mining damage |
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| CN101915063A (en) | 2010-12-15 |
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