CN102619476B - Pipe body structure of step type hole protecting pipe for gas extraction hole in soft coal bed - Google Patents
Pipe body structure of step type hole protecting pipe for gas extraction hole in soft coal bed Download PDFInfo
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- CN102619476B CN102619476B CN201210103061.1A CN201210103061A CN102619476B CN 102619476 B CN102619476 B CN 102619476B CN 201210103061 A CN201210103061 A CN 201210103061A CN 102619476 B CN102619476 B CN 102619476B
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Abstract
A pipe body structure of a step type hole protecting pipe for a gas extraction hole in a soft coal bed, and belongs to the hole protecting pipe. The hole protecting pipe comprises multiple groups of pipes, which are connected from the front end to the tail end in sequence; the diameters of the pipes in different groups are different, the diameters of the pipes in each group of pipes from the front end to the tail end of the hole protecting pipe are reduced in sequence, and every two adjacent pipes in different groups are connected through a reducer pipe; the whole profile of the hole supporting pipe is of a step type structure with a gradually changed diameter; the diameters of the pipes in the same group are the same, and the lengths of the pipes are the same; sieve pores are not formed in the pipe walls of one group of pipes at the most front end but are formed in the pipe walls of the rest groups of pipes, and the pore diameters of the sieve pores in the pipes in the same group are the same; the number of the sieve pores in each group is reduced from the front end to the tail end in sequence; the diameters of the sieve pores in each group are reduced from the front end to the tail end in sequence, the minimal diameter is 4 mm, and the maximal diameter is 10 mm; and the sieve pores are externally wound with gauzes. The pipe body structure has the advantages as follows: the structure is simple, the hole protecting pipe is not easily blocked and is more easily fed in a deflected drilled hole due to large flexibility, the hole protecting length is long, and the gas extraction efficiency is high at the same time. Therefore, the pipe body structure is suitable for the gas extraction hole in the soft easily-collapsed coal bed.
Description
Technical field
The present invention relates to a kind of guard aperture pipe, particularly the pipe shaft structure of a kind of weak seam gas pumping hole staged guard aperture pipe.
Technical background
< < coal mine gas drainage temporary provisions > > up to standard (2012) requires the serious mine of Gas Disaster must carry out gas pumping, and it is up to standard to realize extraction.But China's weak seam ratio is larger, weak seam collapse hole is a great problem of restriction gas pumping, has seriously hindered mine extraction process up to standard.The at present effective technology measure of control weak seam collapse hole is few, main employing to the method for sending into guard aperture pipe in gas pumping hole.China's concordant mash gas pumping drilling depth-averaged has reached more than hundred meters, is subject to the impact of coal seam soft or hard layering and drilling tool deadweight, and deflection in various degree can occur drilling track, and after the trip-out of weak seam gas pumping hole, collapse in the interior part that can occur of short time.Be subject to above factor impact, common equal diameter guard aperture pipe is sent into distance and is limited by very large: paper < < firedamp taking-out discharging drilling guard aperture Discussion on Technology > > test shows that with high-power rig, make propulsion plant send frequent jam in equal diameter guard aperture pipe process in boring, sends at most 20 m; China Patent Publication No. CN201982132U has proposed a kind of gas pumping guard aperture tubular structure, whole pipe shaft is equal diameter design, while advancing in deflection hole, the frictional resistance of tube wall and hole wall still can be very large, when running into local collapse hole, causes while piling up broken coal in hole, and pipe shaft cannot pass.
Summary of the invention
The pipe shaft structure that the object of this invention is to provide a kind of weak seam gas pumping hole staged guard aperture pipe, solves weak seam deflection hole and sends into the problem easily collapsing and cause gas hard-pumped to go out in the easy jam of guard aperture pipe and gas pumping hole.
The technical solution adopted for the present invention to solve the technical problems is: this guard aperture pipe is linked in sequence by multi units tube from front end to end; The diameter of pipe is different on the same group, and the diameter from guard aperture pipe front end to every group of pipe of end reduces successively, and adjacent two pipes do not connect in succession by reducer pipe on the same group; The stepped construction that guard aperture pipe overall profile is Diameter Gradual Change; The pipe equal diameters of same group of pipe, is formed by connecting by 3～10 pipes, and every sono-explorer equates, is 1.5m ~ 3m; On the tube wall of one group of pipe foremost, do not establish sieve aperture, on the tube wall of all the other group pipes, all establish sieve aperture, the screen-aperture on same group of pipe is identical; The quantity of every group of sieve aperture is reduced to end successively by front end; The diameter of every group of sieve aperture is reduced to end successively by front end, and minimum diameter is 4mm, and maximum gauge is 10mm; Sieve aperture is wound with gauze outward.
Connection between same group of described tube and tube is threaded connection, and each root pipe one end of same group is provided with internal thread one end and is provided with external screw thread, and internal and external threads matches.
Described reducer pipe connects one end and is provided with external screw thread and is connected with last group of guard aperture pipe, and one end is provided with internal thread and is connected with rear one group of guard aperture pipe; Reducing external surface is taper surface, and reducing length is 0.1m ~ 0.2m.
Beneficial effect, owing to having adopted such scheme,
The pyramidal structure that A, guard aperture pipe overall profile are Diameter Gradual Change, more easily sends into deflection boring, while running into the more situation of local slight collapse hole or ickings, easily passes through;
B, every group of guard aperture pipe sieve aperture quantity are reduced to end successively by front end, diameter is reduced to end successively by front end, pipe shaft intensity and toughness have been ensured, running into collapse hole or jam can not be out of shape easily or fracture, simultaneously this project organization distributes extraction negative pressure reasonable, the Emission Law that meets drilling gas flow, gas pumping efficiency is high.
C, guard aperture pipe sieve aperture are wound around gauze, and the ut that can avoid guard aperture pipe sieve aperture to be caving by boring is blocked, thus efficient mash gas extraction for a long time.
advantage:the present invention is simple in structure, and the whole amount of deflection of guard aperture pipe is large, is difficult for jam, more easily sends into deflection boring, and guard aperture length is long, and gas pumping efficiency is high simultaneously, is particularly useful for the gas pumping hole in soft easy collapse hole coal seam.
Accompanying drawing explanation
Fig. 1 whole guard aperture duct ligation composition of the present invention.
Fig. 2 single-unit guard aperture of the present invention duct ligation composition.
Fig. 3 taper variable-diameter structure of the present invention figure.
In figure: 1, single group gas pumping pipe; 2, reducer pipe connects; 3, sieve aperture; 4, organize foremost guard aperture pipe; 5, the guard aperture pipe of least significant end group; 6, external screw thread; 7, internal thread.
The specific embodiment
Below in conjunction with accompanying drawing, one embodiment of the present of invention are further described:
Embodiment 1: this guard aperture pipe is linked in sequence by multi units tube from front end to end; The diameter of pipe is different on the same group, and the diameter from guard aperture pipe front end to every group of pipe of end reduces successively, and adjacent two pipes do not connect in succession by reducer pipe on the same group; The stepped construction that guard aperture pipe overall profile is Diameter Gradual Change; The pipe equal diameters of same group of pipe, is formed by connecting by 3～10 pipes, and every sono-explorer equates, is 1.5m ~ 3m; On the tube wall of one group of pipe foremost, do not establish sieve aperture, on the tube wall of all the other group pipes, all establish sieve aperture, the screen-aperture on same group of pipe is identical; The quantity of every group of sieve aperture is reduced to end successively by front end; The diameter of every group of sieve aperture is reduced to end successively by front end, and minimum diameter is 4mm, and maximum gauge is 10mm; Sieve aperture is wound with gauze outward.
Connection between same group of described tube and tube is threaded connection, and each root pipe one end of same group is provided with internal thread one end and is provided with external screw thread, and internal and external threads matches.
Described reducer pipe connects one end and is provided with external screw thread and is connected with last group of guard aperture pipe, and one end is provided with internal thread and is connected with rear one group of guard aperture pipe; Reducing external surface is taper surface, and reducing length is 0.1m ~ 0.2m.
A kind of weak seam diameter is the pipe shaft structure of Ф 75mm, the length trapezoidal guard aperture pipe in gas pumping hole that is 120m.
In Fig. 1, select 5 groups of guard aperture pipes, first group to the 5th group guard aperture pipe diameter is followed successively by 20mm, 25mm, 32mm, 40mm and 50mm.Single-unit guard aperture length of tube is 4m.The first step gets out sieve aperture on all guard aperture pipes, and every meter of first group of guard aperture pipe gets out 2 sieve apertures, and eye diameter is 4mm; Every meter of second group of guard aperture pipe gets out 3 sieve apertures, and eye diameter is 6mm; Every meter of the 3rd group of guard aperture pipe gets out 4 sieve apertures, and eye diameter is 8mm; Every meter of the 4th group of guard aperture pipe gets out 6 sieve apertures, and eye diameter is 10mm; First group to the 4th group is extraction section, plays the effect of supporting hole wall and mash gas extraction.The 5th group of guard aperture pipe do not bore sieve aperture, as sealing of hole section; Second step is wound around gauze on sieve aperture, and control ickings enters drainage tube; The 3rd step, sends into first group of guard aperture pipe to mash gas pumping drilling: the guard aperture pipe of 6 joint diameter Ф 20mm is connected by internal and external screw thread successively and sends into boring; The 4th step, second group of pipe selected the pipe of 6 joint diameter Ф 25mm.End connecting reducing pipe at first group of last pipe joint of pipe connects, the other end that the leading portion connecting reducing pipe of second group of pipe first segment is connect, and second group of all the other pipe is threaded connection successively and sends in boring; The 5th step, connecting reducing pipe connects, send into successively the 3rd group of guard aperture pipe: 6 joint diameter Ф 32mm guard aperture pipes, the 4th group: the guard aperture pipe of 6 joint diameter Ф 40mm guard aperture pipes and the 5th group of 6 joint diameter Ф 50mm, guard aperture pipe on the same group adopts screw thread directly to connect, and the guard aperture pipe between does not on the same group adopt reducer pipe to connect in succession.The 6th step, at sealing of hole section sealing of hole mash gas extraction.
Claims (3)
1. a pipe shaft structure for weak seam gas pumping hole staged guard aperture pipe, is characterized in that: this guard aperture pipe is linked in sequence by multi units tube from front end to end; The diameter of pipe is different on the same group, and the diameter from guard aperture pipe front end to every group of pipe of end reduces successively, and adjacent two pipes do not connect in succession by reducer pipe on the same group; The stepped construction that guard aperture pipe overall profile is Diameter Gradual Change; The pipe equal diameters of same group of pipe, is formed by connecting by 3～10 pipes, and every sono-explorer equates, is 1.5m ~ 3m; On the tube wall of one group of pipe foremost, do not establish sieve aperture, on the tube wall of all the other group pipes, all establish sieve aperture, the screen-aperture on same group of pipe is identical; The quantity of every group of sieve aperture is reduced to end successively by front end; The diameter of every group of sieve aperture is reduced to end successively by front end, and minimum diameter is 4mm, and maximum gauge is 10mm; Sieve aperture is wound with gauze outward.
2. the pipe shaft structure of a kind of weak seam gas pumping according to claim 1 hole staged guard aperture pipe, it is characterized in that: the connection between same group of described tube and tube is threaded connection, each root pipe one end of same group is provided with internal thread one end and is provided with external screw thread, and internal and external threads matches.
3. the pipe shaft structure of a kind of weak seam gas pumping according to claim 1 hole staged guard aperture pipe, is characterized in that: described reducer pipe connects one end and is provided with external screw thread and is connected with last group of guard aperture pipe, and one end is provided with internal thread and is connected with rear one group of guard aperture pipe; Reducing external surface is taper surface, and reducing length is 0.1m ~ 0.2m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210103061.1A CN102619476B (en) | 2012-04-10 | 2012-04-10 | Pipe body structure of step type hole protecting pipe for gas extraction hole in soft coal bed |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210103061.1A CN102619476B (en) | 2012-04-10 | 2012-04-10 | Pipe body structure of step type hole protecting pipe for gas extraction hole in soft coal bed |
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| CN102619476A CN102619476A (en) | 2012-08-01 |
| CN102619476B true CN102619476B (en) | 2014-03-26 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL2024998A (en) * | 2019-03-05 | 2020-09-11 | Univ Anhui Sci & Technology | Gas extraction pipe applicable to upbound borehole tending to collapse |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105386754B (en) * | 2015-11-16 | 2019-02-12 | 山东科技大学 | Observation system for the soft coal petrography uplink drilling gas pressure in mine |
| CN105673068A (en) * | 2016-03-17 | 2016-06-15 | 淮南大屯注浆工程有限公司 | Large-aperture filtering type gas hole sealing tube extraction device and work principle thereof |
| CN107461159B (en) * | 2017-09-01 | 2019-03-01 | 山东科技大学 | Minery gas drainage ground wellhole privacy protection pipe |
| CN110778356B (en) * | 2019-11-05 | 2020-11-24 | 河南工程学院 | Deep-buried soft coal seam full-hole deep reducing hole protection and sealing system and method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4303274A (en) * | 1980-06-04 | 1981-12-01 | Conoco Inc. | Degasification of coal seams |
| US4391327A (en) * | 1981-05-11 | 1983-07-05 | Conoco Inc. | Solvent foam stimulation of coal degasification well |
| CN201687511U (en) * | 2009-12-17 | 2010-12-29 | 淮南矿业(集团)有限责任公司 | Wall-protecting shock tube of extraction drill hole |
| CN201924897U (en) * | 2011-02-14 | 2011-08-10 | 中国矿业大学 | Well bore structure of pressure-relief coal bed methane ground extraction well |
| CN201982132U (en) * | 2010-04-29 | 2011-09-21 | 凌标灿 | Hole-protecting pipe for gas extraction hole |
-
2012
- 2012-04-10 CN CN201210103061.1A patent/CN102619476B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4303274A (en) * | 1980-06-04 | 1981-12-01 | Conoco Inc. | Degasification of coal seams |
| US4391327A (en) * | 1981-05-11 | 1983-07-05 | Conoco Inc. | Solvent foam stimulation of coal degasification well |
| CN201687511U (en) * | 2009-12-17 | 2010-12-29 | 淮南矿业(集团)有限责任公司 | Wall-protecting shock tube of extraction drill hole |
| CN201982132U (en) * | 2010-04-29 | 2011-09-21 | 凌标灿 | Hole-protecting pipe for gas extraction hole |
| CN201924897U (en) * | 2011-02-14 | 2011-08-10 | 中国矿业大学 | Well bore structure of pressure-relief coal bed methane ground extraction well |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL2024998A (en) * | 2019-03-05 | 2020-09-11 | Univ Anhui Sci & Technology | Gas extraction pipe applicable to upbound borehole tending to collapse |
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