CN103939019A - Drill hole hydraulic broadening permeability increasing device for gas drainage - Google Patents
Drill hole hydraulic broadening permeability increasing device for gas drainage Download PDFInfo
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- CN103939019A CN103939019A CN201410172915.0A CN201410172915A CN103939019A CN 103939019 A CN103939019 A CN 103939019A CN 201410172915 A CN201410172915 A CN 201410172915A CN 103939019 A CN103939019 A CN 103939019A
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- reaming section
- broadening
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Abstract
The invention provides a drill hole hydraulic broadening permeability increasing device for gas drainage. The drilling diameter is increased, so that tangential stress of a coal body on the periphery of a hole is reduced, a radial crack of the coal body on the periphery of the hole is enlarged, and the gas drainage effect of the coal body of the drill hole is improved. The drill hole hydraulic broadening permeability increasing device comprises a pressurizing capsule, an inner hole broadening pipe sheet, an outer hole broadening pipe sheet, a telescopic abrasion reduction rolling ball cushion layer and a height-decreasing permeable cushion layer. After drilling to the designed depth of the drill hole, a drill rod retreats, the device is arranged into the drill hole, liquid is injected into the pressurizing capsule to increase pressure, and in this way, the crack between the inner hole broadening sheet and the outer hole broadening sheet is enlarged, the tangential stress of the coal body on the periphery of the drill hole is reduced, the radial crack is enlarged, and gas is discharged out of the drill hole from the crack between the inner hole broadening sheet and the outer hole broadening sheet, the height-decreasing permeable cushion layer and the telescopic abrasion reduction rolling ball cushion layer. After gas drainage is finished, hydration of the pressurizing capsule is decreased to the lowest level, the inner hole broadening sheet, the outer hole broadening sheet, the telescopic abrasion reduction rolling ball cushion layer and the height-decreasing permeable cushion layer are reset, and the device is taken out of the drill hole. The drill hole hydraulic broadening permeability increasing device for gas drainage is simple in structure, easy to operate, low in cost and capable of being reused and applied to gas drainage and drill hole permeability increasing.
Description
Technical field
The present invention relates to the anti-reflection device of a kind of firedamp taking-out discharging drilling hydraulic pressure reaming, can be used for increasing boring coal body permeability around.
Background technology
In the time of coal mine gas extraction, boring is one of important procedure.After having holed, the permeability of hole wall just becomes the principal element that affects gas drainage under suction effect.Theoretical research and field practice show, outside by borehole wall, radial stresses increases to the stress of primary rock gradually by 0, and shear stress increases to peak value gradually by 0, is then reduced to gradually the stress of primary rock.The shear stress section of increasing coal body is compressed by shear stress, and shrink in space, closing of fracture, and permeability reduces, and reduces the Radial Flow Through Porous Media of distant place coal gas to boring.Therefore, the naked hole gas drainage under suction efficiency of non-support measure is lower, and pumping volume is less.If the radial stresses of coal body, expands aperture around holing by increase, can change the larger phenomenon of hole week shear stress; Compress by the hoop that reduces hole week coal body, even make hole week coal body produce hoop and stretch and then produce Radial crack, can greatly increase the passage of all coal gas in hole to boring Radial Flow Through Porous Media, improve drill mash gas amount and drainage efficient.
Summary of the invention
Compressed by hoop for coal body around firedamp taking-out discharging drilling, cause the phenomenon that drilling-draining efficiency is lower, the invention provides the anti-reflection device of a kind of firedamp taking-out discharging drilling hydraulic pressure reaming, with hydraulic pressure transfer load, utilize rigid matrix to carry out reaming anti-reflection, improve gas pumping rate thereby can convenient and swiftly complete reaming work, and there is simple, long service life rational in infrastructure, the advantage such as reusable.
The invention provides the anti-reflection device of a kind of firedamp taking-out discharging drilling hydraulic pressure reaming.This device comprises supercharging capsule, inside and outside reaming section of jurisdiction, antifriction ball and the high bed course composition that oozes that can contract.Described interior reaming section of jurisdiction, inner by high bed course (1) the parcel hydraulic pressure oil sac that oozes that can contract, outside is connected with outer reaming section of jurisdiction by reducing the ball bed course that rubs; Outside, outer reaming section of jurisdiction contacts with hole wall by the high bed course (2) that oozes that can contract.
Adopt this device to carry out reaming when anti-reflection, by hydraulic pump outside hole to hydraulic bag feed flow, hydraulic bag is expanded, hydraulic bag expands and makes interior reaming section of jurisdiction away from device central axis, by antifriction layer transition, then make outer reaming section of jurisdiction away from device central axis, by contracting, the high bed course (2) that oozes applies active force to hole wall, finally make hole wall expand, make shear stress increase district and be evolved into shear stress reduction district.The described high bed course (1) that oozes that contracts can be realized can compression deformation, high osmosis compared with under low stress and avoid hydraulic pressure capsule and the high bed course (1) that oozes that can contract self enters the gap between interior reaming section of jurisdiction.Described contract high ooze bed course (2) can realize can compression deformation compared with under low stress, high osmosis is so that hole week gas enters seepage flow between the gap of outer reaming section of jurisdiction and interior reaming section of jurisdiction, and avoid hole week coal body and the high bed course (2) that oozes that can contract self enter the gap between outer reaming section of jurisdiction.The described ball bed course that rubs that reduces can reduce the frictional force between interior reaming section of jurisdiction and outer reaming section of jurisdiction, can reduce the ball bed course that rubs easily deformable, and can not enter the gap between gap and the outer reaming section of jurisdiction between interior reaming section of jurisdiction.In the time of hydraulic bag release, interior reaming section of jurisdiction and outer reaming section of jurisdiction shrink back home position, conveniently from boring, take out Counterboring apparatus, then are installed to other boring continuation uses.
The anti-reflection device of a kind of firedamp taking-out discharging drilling hydraulic pressure reaming of the present invention has the following advantages and effect: the one, the present invention can start by simple controller, oiling, close, the operation such as oil return; The 2nd, delicate structure of the present invention is simple, saves cost; The 3rd, the present invention utilizes the externally reaming of reaming section of jurisdiction entirety, not easy to wear and more efficient.The present invention is the anti-reflection ideal device of firedamp taking-out discharging drilling, can improve gas drainage under suction effect by expanding coal bed gas extraction bore diameter, change borehole circumference stress distribution and Fracture Networks.
Brief description of the drawings
Fig. 1 is the anti-reflection device vertical axis of a kind of firedamp taking-out discharging drilling hydraulic pressure reaming of the present invention sectional schematic diagram.
Fig. 2 is the anti-reflection device of a kind of firedamp taking-out discharging drilling hydraulic pressure reaming of the present invention sectional schematic diagram that parallels to the axis.
In figure: 1 is supercharging capsule; 2 for contracting the high bed course (1) that oozes; 3 is interior reaming section of jurisdiction; 4 for can reduce the ball bed course that rubs; 5 is outer reaming section of jurisdiction; 6 for contracting the high bed course (2) that oozes; 7 is boring; 8 is coal body.
Detailed description of the invention
Below in conjunction with drawings and Examples, the present invention will be further described.
The invention provides the anti-reflection device of a kind of firedamp taking-out discharging drilling hydraulic pressure reaming.
As shown in Figure 1, concrete steps of the present invention are as follows.
(1) drilling construction, after projected depth, takes out drilling rod, and this device is put into boring 7.
(2) reach design load to the interior injection liquid force feed of supercharging capsule 1, supercharging capsule 1 expands interior reaming section of jurisdiction 3 by the high bed course (1) 2 that oozes that can contract, interior reaming section of jurisdiction 3 is by expanding outer reaming section of jurisdiction 5 by reducing the ball bed course 4 that rubs, outer reaming section of jurisdiction expands boring aperture by the high bed course (2) 6 that oozes that can contract, make week shear stress rising district, hole change stress relaxed area into, increase gas seepage flow and enter the Radial crack of boring.
(3) close topping-up pump, oil pressure in supercharging capsule is stablized, the stress state of borehole circumference coal body and Fracture Networks are remained unchanged.
(4) in the time that gas drainage under suction effect declines, improve supercharging capsule 1 pressure, further supercharging reaming, increases hole week crack passage, then, closes topping-up pump, keeps supercharging capsule 1 pressure.
(5) when gas drainage under suction effect declines when obvious, repeating step (4).
(6) in the time that reaming can not obviously improve extraction effect, open pressure-relief valve, reduce supercharging capsule 1 pressure, make the each parts of this device reset to reset condition, and take out from boring.
(7), while using this device to next boring, repeat to arrange (1) ~ (6).
The above, just specific embodiments of the invention, not make any pro forma restriction to the present invention, are not departing from technical scheme of the present invention basis, and simple modification, equivalent variations or the modification done, all fall into protection scope of the present invention.
Claims (1)
1. the anti-reflection device of firedamp taking-out discharging drilling hydraulic pressure reaming, comprises supercharging capsule, and inside and outside reaming section of jurisdiction can reduce rub ball bed course and the high bed course that oozes that can contract, it is characterized in that,
1) described interior reaming section of jurisdiction, inner by high bed course (1) the parcel hydraulic pressure oil sac that oozes that can contract, outside is connected with outer reaming section of jurisdiction by reducing the ball bed course that rubs;
2) outside, described outer reaming section of jurisdiction contacts with hole wall by the high bed course (2) that oozes that can contract;
3) described supercharging capsule is by hydraulic pump feed flow pressuring expansion outside hole, hydraulic bag expand make to contract highly ooze bed course (1), interior reaming section of jurisdiction, can reduce the ball bed course that rubs, outer reaming section of jurisdiction, the high bed course (2) that oozes that can contract is away from device central axis, apply active force to hole wall, finally make hole wall expand, make shear stress increase district and be evolved into shear stress reduction district, increase hole week coal body Radial crack, improve drilling-draining effect;
4) the described high bed course (1) that oozes that can contract can be realized can compression deformation, high osmosis compared with under low stress and avoid hydraulic pressure capsule and the high bed course (1) that oozes that can contract self enters the gap between interior reaming section of jurisdiction;
5) described can contract high ooze bed course (2) can realize can compression deformation compared with under low stress, high osmosis is so that hole week gas enters seepage flow between the gap of outer reaming section of jurisdiction and interior reaming section of jurisdiction, and avoid hole week coal body and the high bed course (2) that oozes that can contract self enter the gap between outer reaming section of jurisdiction;
6) described in, can reduce the ball bed course that rubs and can reduce the frictional force between interior reaming section of jurisdiction and outer reaming section of jurisdiction, can reduce the ball bed course that rubs easily deformable, and can not enter the gap between gap and the outer reaming section of jurisdiction between interior reaming section of jurisdiction;
7) when described supercharging capsule unloads, hydraulic bag shrink make to contract highly ooze bed course (1), interior reaming section of jurisdiction, can reduce the ball bed course that rubs, outer reaming section of jurisdiction, high bed course (2) the approaching device central axis that oozes can contract, return to original state, facilitate this device to take out from boring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410172915.0A CN103939019B (en) | 2014-04-25 | 2014-04-25 | A kind of firedamp taking-out discharging drilling hydraulic pressure reaming permeability improvement device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410172915.0A CN103939019B (en) | 2014-04-25 | 2014-04-25 | A kind of firedamp taking-out discharging drilling hydraulic pressure reaming permeability improvement device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103939019A true CN103939019A (en) | 2014-07-23 |
| CN103939019B CN103939019B (en) | 2018-06-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410172915.0A Expired - Fee Related CN103939019B (en) | 2014-04-25 | 2014-04-25 | A kind of firedamp taking-out discharging drilling hydraulic pressure reaming permeability improvement device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110821550A (en) * | 2019-10-09 | 2020-02-21 | 山西潞安环保能源开发股份有限公司 | Coal roadway gas drainage method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| UA65896A (en) * | 2003-06-24 | 2004-04-15 | Univ Nat Mining | Method for extraction of gas fuel from bulk coal |
| CN101275469A (en) * | 2008-05-12 | 2008-10-01 | 淮南矿业(集团)有限责任公司 | Yolk coal rock formation downward hole pumping and mining pressure relief mash gas construction method |
| CN101307695A (en) * | 2008-07-09 | 2008-11-19 | 黎凤岐 | Coal mine gas pre-draining borehole sealing method adopting aerated capsule as temporary hole bottom |
| CN102966372A (en) * | 2012-12-17 | 2013-03-13 | 中国矿业大学 | Slotting induced-flow pressure-relief anti-reflection method for complicated seam |
| CN103133028A (en) * | 2013-03-12 | 2013-06-05 | 河南理工大学 | Underground coal seam hydrofracture crack oriented developing method |
-
2014
- 2014-04-25 CN CN201410172915.0A patent/CN103939019B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| UA65896A (en) * | 2003-06-24 | 2004-04-15 | Univ Nat Mining | Method for extraction of gas fuel from bulk coal |
| CN101275469A (en) * | 2008-05-12 | 2008-10-01 | 淮南矿业(集团)有限责任公司 | Yolk coal rock formation downward hole pumping and mining pressure relief mash gas construction method |
| CN101307695A (en) * | 2008-07-09 | 2008-11-19 | 黎凤岐 | Coal mine gas pre-draining borehole sealing method adopting aerated capsule as temporary hole bottom |
| CN102966372A (en) * | 2012-12-17 | 2013-03-13 | 中国矿业大学 | Slotting induced-flow pressure-relief anti-reflection method for complicated seam |
| CN103133028A (en) * | 2013-03-12 | 2013-06-05 | 河南理工大学 | Underground coal seam hydrofracture crack oriented developing method |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110821550A (en) * | 2019-10-09 | 2020-02-21 | 山西潞安环保能源开发股份有限公司 | Coal roadway gas drainage method |
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| CN103939019B (en) | 2018-06-05 |
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