CN103899349A - Coal seam gas extraction method and extraction hole radial drilling guide device - Google Patents
Coal seam gas extraction method and extraction hole radial drilling guide device Download PDFInfo
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- CN103899349A CN103899349A CN201410165740.0A CN201410165740A CN103899349A CN 103899349 A CN103899349 A CN 103899349A CN 201410165740 A CN201410165740 A CN 201410165740A CN 103899349 A CN103899349 A CN 103899349A
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Abstract
The invention discloses a coal seam gas extraction method and an extraction hole radial drilling guide device. The method comprises the steps that a person walks from a cross-hole roadway to a drilling extraction hole along a coal seam; the radial drilling guide device for hydraulic drilling is arranged in the extraction hole; the radial drilling guide device is regulated; a water power jet flow nozzle and a bendable medium pipeline are arranged in the guide device, and the jet flow nozzle deflects through guide device, so that the included angle between the axial direction of the jet flow nozzle and the axial direction of the extraction hole ranges from 60 degrees to 90 degrees; the nozzle retreats after one branch hole is drilled to a set height in a water power jetting mode; repeated regulation and branch hole drilling are conducted until jetting of all the branch holes is completed; fracturing and hole sealing are conducted; water power fracturing and gas extraction are conducted on the coal seam until the standard is met. The device is used for controlling drilling directions and positions of the branch holes. The method and the device have the advantages that the extraction method is capable of reducing the preparing workload of roadway construction, shortens preparing time, and improves coal mining efficiency; the device is simple in structure, convenient to operate, and capable of conveniently drilling the branch holes in the extraction hole in the radial direction.
Description
Technical field
The present invention relates to a kind of coal-bed gas gas pumping method, the pre-pumping method of especially a kind of coal-bed gas and drainage holes radially creep into guiding device.
Background technology
Coal-bed gas is a kind of clear energy sources, but for coal production a kind of disaster source especially.The coal of China is composed and is deposited complex geologic conditions, mainly relies on underground mining, and along with the increase of mining depth, coal seam gas-bearing capacity increases gradually, and coal-bed gas pressure increases, and outstanding danger increases, and protrusion-dispelling difficulty is increasing.Coal mining gas pre-drainage is to needing the region of digging laneway to carry out the pre-extraction of strip-type before coal road driving.Existing extraction way is in seat earth or top board, to tunnel Yi Dichou Xiang Huodingchou lane, in Di Chou Xiang Huodingchou lane, holes to strip coal layer region.Because this extraction way need to tunnel Di Chou Xiang Huodingchou lane, its workload is large, and tunnelling time is long, and drivage efficiency is low.For this reason, need to take out mode in advance and device improves to existing coal-bed gas.
Summary of the invention
The first object of the present invention is the deficiency for existing drainage from coal seam technology, provide a kind of coal-bed gas pre-pumping method, substitute extraction lane by creep into drainage holes in seat earth or top board, to cancel Di Chou Xiang Huodingchou lane, reduce the engineering quantity of coal cutting roadway driving preparation, shorten the time of mining, improve coal mining efficiency.
For realizing the first object, the present invention adopts following technical scheme:
The pre-pumping method of a kind of coal-bed gas, comprises the following steps:
A, in seat earth or top board, creep into drainage holes from crossdrift tunnel along bearing, this drainage holes extends along bearing;
B, in drainage holes, install the fluid power hole diameter being formed by fixed disk and activity-oriented parts to creeping into guiding device, and fixed disk is fixedly connected with the aperture place crag of drainage holes;
The activity-oriented parts of guiding device are radially crept in c, the direction initialization creeping into by plan brill branched hole and position adjustment;
D, by the fluid jet nozzle of jetting rig, and the flexible medium pipeline being connected with fluid jet nozzle inserts in activity-oriented parts, and makes fluid jet nozzle axially and drainage holes is axially the deflection of 60～90 ° of angles by activity-oriented parts front end;
E, utilize jetting rig to creep into branched hole to set depth, exit flexible medium pipeline and fluid jet nozzle;
F, repeating step c～e, until the branched hole in setting regions has all sprayed;
Guiding device and jetting rig are crept in g, dismounting, pressure break screen casing is inserted to drainage holes, and drainage holes is carried out to sealing of hole by pressure break requirement;
H, pressure break screen casing is connected with fracturing pump group, utilizes fracturing pump group pre-stripping band control area, coal seam to be carried out to the anti-reflection processing of fracturing;
The connecting tube of i, dismounting pressure break screen casing and fracturing pump group, is connected pressure break screen casing with coal mine gas extraction system, carry out coal bed gas extraction, until the gas bearing capacity in pre-stripping band control area, coal seam meets tunnel safety driving standard.
Adopt the present invention of technique scheme, in the rock stratum of seat earth or top board, creep into the drainage holes extending along bearing in the crossdrift position between underworkings, radially creep into guiding device and in guiding device, install hydrojet boring shower nozzle and flexible medium pipeline radially creeping into by arranging in this drainage holes, realize the multiple branched holes taking drainage holes as trunk hole, and by carrying out the pre-extraction of band coal bed gas after hydraulic fracturing anti-reflection, thereby realizing band gas pre-drainage in the mode in the alternative Di Chou Xiang Huodingchou of drainage holes lane adopts, no longer need to tunnel Di Chou Xiang Huodingchou lane, can effectively reduce the preparation that band gas pre-drainage is adopted and coal road tunnels, shorten the time of mining, improve coal mining efficiency.
The second object of the present invention is to provide the pre-drainage holes of a kind of coal-bed gas and radially creeps into guiding device, realizing turning round of hydrojet boring by this device turns to, realize strip coal layer gas pre-drainage and adopt to form multiple branched holes on extraction trunk hole, reach the object that substitutes Di Chou Xiang Huodingchou lane with trunk hole.
For realizing the second object, the present invention adopts following scheme.
The pre-drainage holes of a kind of coal-bed gas radially creeps into guiding device, comprises fixed disk and activity-oriented parts, and fixed disk is provided with and the installing hole being fixedly connected with for crag, in the outer card of fixed disk, is formed with angle index; Described activity-oriented parts comprise transition disc, transition disc is coaxially connected to by screw in the outer card of described fixed disk, the curved gain shape of screw connecting hole that transition disc is provided with, transition disc outer cylinder surface is provided with groove groove, is formed with gear tongue on the bore area of transition disc; Transition disc is sliding combined with guide pipe by endoporus, is formed with the gathering sill coordinating with gear tongue room on the outer cylinder surface of guide pipe; Guide pipe is by bend pipe and straight tube and form, and the exit axis of this bend pipe and straight tube axis are the deflection of 60～90 ° of angles.
Adopt the present invention of technique scheme, when use, activity-oriented parts are arranged in the extraction trunk hole of seat earth or top board formation, and be fixed on by fixed disk on the aperture crag in trunk hole, activity-oriented parts radially creep into guiding for branched hole, to form the branched hole that is 60～90 ° of angles with trunk hole, adjust bend pipe to the distance between fixed disk by mobile straight tube, to form the multiple branched holes that distribute along trunk axially bored line, simultaneously, by rotating transition disc, bend pipe is turned an angle, form multiple branched holes with the same depth location in trunk hole, to realize the object of taking out Huo Dingchou hole, hole by the alternative end of trunk drainage holes.
Preferably, on described transition disc, be fixedly connected with handle.Be convenient to transition disc to implement transposition operation.
Preferably, described straight tube is made up of multiple straight lengths, the straight length adjacent with described bend pipe is welded on bend pipe, the syndeton of the end-tooth of adjacent two straight lengths by 3～6 circumference uniform distributions and the end face groove formation convex-concave complementation that coordinates with this end-tooth, in the end-tooth of adjacent two straight lengths and the section of cooperation of end face groove, be provided with the axle elastic collar axially connecting for the two by collar groove; Described gathering sill is located on straight length.The quantity that can increase and decrease easily straight length is adjusted the distance between bend pipe and fixed disk, thereby realizes the setting of branched hole in the axial different distance in trunk hole.End-tooth can effectively prevent that adjacent straight pipeline section from mutual transposition occurring more than being set to three, to the guiding of bend pipe is effectively controlled, concrete quantity is comprehensively determined according to straight length diameter and length, taking 6 as the upper limit.
Further preferred, described straight length is positioned at clamping on the pipeline section of transition disc the pincers of embracing.Simple in structure, easy to operate, can effectively prevent that guiding parts is to slippage in hole.
The present invention's beneficial effect is compared with prior art that pumping method can effectively reduce tunnelling preparation amount, shortens time, improves coal mining efficiency; Apparatus structure is simple, easy to operate, can conveniently in drainage holes, radially creep into multiple branched holes.
Brief description of the drawings
Fig. 1 is the application drainage holes 1 that creeps into of the inventive method and the position relationship schematic diagram of branched hole 11.
Fig. 2 is drainage holes 1 and the axial cut-away illustration of branched hole 11 that application the inventive method is crept into.
Fig. 3 is the structural representation that application the inventive method is carried out after sealing of hole the drainage holes 1 creeping into.
Fig. 4 is the structural representation of guiding device of the present invention.
Fig. 5 is the top view of Fig. 4 of the present invention.
Fig. 6 is straight length 92 structural representations in guiding device of the present invention.
Fig. 7 is the upward view of Fig. 6 of the present invention.
Fig. 8 is the top view of Fig. 6 of the present invention.
Fig. 9 is the syndeton schematic diagram of bend pipe 91 and adjacent straight pipeline section 92 in guiding device of the present invention.
Figure 10 is the structural representation of embracing pincers 12 in guiding device of the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is further illustrated, but therefore do not limit the present invention among described practical range.
A, in seat earth or top board, creep into drainage holes 1 from crossdrift tunnel along bearing, this drainage holes 1 extends along bearing;
B, in drainage holes 1, install the fluid power hole diameter being formed by fixed disk 2 and activity-oriented parts 3 to creeping into guiding device, and be fixedly connected with the aperture place crag of drainage holes 1 by fixed disk 2;
The activity-oriented parts 3 of guiding device are radially crept in c, the direction initialization creeping into by plan brill branched hole 11 and position adjustment;
D, by the fluid jet nozzle of jetting rig 4, and the flexible medium pipeline 5 being connected with fluid jet nozzle 4 inserts in activity-oriented parts 3, and make fluid jet nozzle 4 axially and drainage holes 1 is axially the deflection of 60～90 ° of angles by activity-oriented parts 3 front ends;
E, utilize jetting rig to creep into branched hole 11 to set depth, exit flexible medium pipeline 5 and fluid jet nozzle 4;
F, repeating step c～e, until the branched hole 11 in setting regions has all sprayed;
Guiding device and jetting rig are crept in g, dismounting, pressure break screen casing 6 is inserted to drainage holes 1, and drainage holes 1 is carried out to sealing of hole by pressure break requirement;
H, pressure break screen casing 6 is connected with fracturing pump group, utilizes fracturing pump group pre-stripping band control area, coal seam to be carried out to the anti-reflection processing of fracturing;
The connecting tube of i, dismounting pressure break screen casing and fracturing pump group, is connected pressure break screen casing with coal mine gas extraction system, carry out coal bed gas extraction, until the gas bearing capacity in pre-stripping band control area, coal seam meets tunnel safety driving standard.
In the present embodiment, end-tooth 92a can be also three, five or six.
Carry out in drilling operation process at the branched hole that utilizes this device to carry out extraction, when needs adjustment is crept into branched hole axially and when radial position, first by the flexible medium pipeline of waterpower rig and fluid jet nozzle 4 exit from the straight-tube portion of guiding device, then by transition disc 7 rotational angles or by increase and decrease straight length 92 convert axial location.
Although combine above accompanying drawing, embodiments of the present invention are described, but those of ordinary skill in the art also can recognize making various variations or amendment in the scope of claims, these modifications and variations are interpreted as within scope of the present invention and intention.
Claims (6)
1. the pre-pumping method of coal-bed gas, is characterized in that, comprises the following steps:
A, in seat earth or top board, creep into drainage holes (1) from crossdrift tunnel along bearing, this drainage holes (1) along bearing extend;
B, in drainage holes (1), install the fluid power hole diameter being formed by fixed disk (2) and activity-oriented parts (3) to creeping into guiding device, and be fixedly connected with the aperture place crag of drainage holes (1) by fixed disk (2);
The activity-oriented parts (3) of guiding device are radially crept in c, the direction initialization creeping into by plan brill branched hole (11) and position adjustment;
D, by the fluid jet nozzle of jetting rig (4), and the flexible medium pipeline (5) being connected with fluid jet nozzle (4) inserts in activity-oriented parts (3), and make fluid jet nozzle (4) axially and drainage holes (1) is axially the deflection of 60～90 ° of angles by activity-oriented parts (3) front end;
E, utilize jetting rig to creep into branched hole (11) to set depth, exit flexible medium pipeline (5) and fluid jet nozzle (4);
F, repeating step c～e, until the branched hole (11) in setting regions has all sprayed;
Guiding device and jetting rig are crept in g, dismounting, pressure break screen casing (6) is inserted to drainage holes (1), and drainage holes (1) is carried out to sealing of hole by pressure break requirement;
H, pressure break screen casing (6) is connected with fracturing pump group, utilizes fracturing pump group pre-stripping band control area, coal seam to be carried out to the anti-reflection processing of fracturing;
The connecting tube of i, dismounting pressure break screen casing and fracturing pump group, is connected pressure break screen casing with coal mine gas extraction system, carry out coal bed gas extraction, until the gas bearing capacity in pre-stripping band control area, coal seam meets tunnel safety driving standard.
2. the pre-drainage holes of coal-bed gas radially creeps into guiding device, it is characterized in that, comprise fixed disk (2) and activity-oriented parts, fixed disk (2) is provided with and the installing hole being fixedly connected with for crag (21), is formed with angle index (22) in the outer card of fixed disk (2); Described activity-oriented parts comprise transition disc (7), transition disc (7) is coaxially connected to by screw (8) in the outer card of described fixed disk (2), the curved gain shape of screw connecting hole that transition disc (7) is provided with, transition disc (7) outer cylinder surface is provided with groove groove (71), is formed with gear tongue (72) on the bore area of transition disc (7); Transition disc (7) is sliding combined with guide pipe by endoporus, is formed with the gathering sill with gear tongue (72) matched in clearance on the outer cylinder surface of guide pipe; Guide pipe is by bend pipe (91) and straight tube and form, and the exit axis of this bend pipe (91) and straight tube axis are the deflection of 60～90 ° of angles.
3. the pre-drainage holes of coal-bed gas according to claim 2 radially creeps into guiding device, it is characterized in that, is fixedly connected with handle (10) on described transition disc (7).
4. radially creep into guiding device according to the pre-drainage holes of the coal-bed gas described in claim 2 or 3, it is characterized in that, described straight tube is made up of multiple straight lengths (92), the straight length (92) adjacent with described bend pipe (91) is welded on bend pipe (91), the syndeton of the end-tooth (92a) of adjacent two straight lengths (92) by 3～6 circumference uniform distributions and end face groove (92b) the formation convex-concave complementation that coordinates with this end-tooth (92a), in the end-tooth (92a) of adjacent two straight lengths (92) and the section of cooperation of end face groove (92b), be provided with the elastic collar for axle (93) axially connecting for the two by collar groove (92c), described gathering sill is located on straight length (92).
5. the pre-drainage holes of coal-bed gas according to claim 4 radially creeps into guiding device, it is characterized in that, described straight length (92) is positioned at clamping on the pipeline section of transition disc (7) the pincers of embracing (12).
6. the pre-drainage holes of coal-bed gas according to claim 5 radially creeps into guiding device, it is characterized in that, described armful of pincers (12) comprise that the hinged two semicircular in one end embraces folder (12a), the free end that semicircle is embraced folder (12a) is connected with two parallel handles, and two handles are fixedly connected with nut by bolt (12b).
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| CN201410165740.0A CN103899349B (en) | 2014-04-23 | 2014-04-23 | A kind of pre-pumping method of coal-bed gas and drainage holes radial direction creep into guiding device |
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| CN104389559A (en) * | 2014-09-30 | 2015-03-04 | 河南理工大学 | Method and device for preventing and controlling gas transfinite in thick-coal-seam mining process |
| CN104696003A (en) * | 2015-01-06 | 2015-06-10 | 中国矿业大学 | Coal seam gas extraction method capable of realizing drilling and cutting integration and oscillation and heat injection cooperative reinforcement |
| CN104747230A (en) * | 2015-03-02 | 2015-07-01 | 王肇东 | Coal mine well gas extraction device and use method thereof |
| CN106761652A (en) * | 2016-12-26 | 2017-05-31 | 大庆井泰石油工程技术股份有限公司 | Orientation windowing horizontal drilling, coring and matching method |
| CN106907175A (en) * | 2017-05-02 | 2017-06-30 | 中国矿业大学 | The efficient extraction coal roadway stripe gas of base plate concordant long drilled holes staged fracturing and region outburst elimination method |
| CN107575164A (en) * | 2017-10-25 | 2018-01-12 | 中煤科工集团重庆研究院有限公司 | A kind of high-pressure hydraulic with the conditions of brill radially creeps into guider and method |
| CN110953015A (en) * | 2019-12-25 | 2020-04-03 | 太原理工大学 | Soft low-permeability coal seam long-drill-hole directional segmented fracturing efficient gas extraction method |
| CN112682090A (en) * | 2020-12-30 | 2021-04-20 | 中煤科工集团重庆研究院有限公司 | Coal seam drilling interconnection method and system based on impact process and gas extraction method |
| CN113417636A (en) * | 2021-05-31 | 2021-09-21 | 中煤科工集团重庆研究院有限公司 | Accurate hydraulic fracturing process for comb-shaped layer-through directional long-drilling branch hole coal seam section |
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| CN107575164A (en) * | 2017-10-25 | 2018-01-12 | 中煤科工集团重庆研究院有限公司 | A kind of high-pressure hydraulic with the conditions of brill radially creeps into guider and method |
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| CN112682090A (en) * | 2020-12-30 | 2021-04-20 | 中煤科工集团重庆研究院有限公司 | Coal seam drilling interconnection method and system based on impact process and gas extraction method |
| CN113417636A (en) * | 2021-05-31 | 2021-09-21 | 中煤科工集团重庆研究院有限公司 | Accurate hydraulic fracturing process for comb-shaped layer-through directional long-drilling branch hole coal seam section |
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