CN103912302A - Seam-penetrating drilling hydrofracturing gas extracting method - Google Patents
Seam-penetrating drilling hydrofracturing gas extracting method Download PDFInfo
- Publication number
- CN103912302A CN103912302A CN201410037866.XA CN201410037866A CN103912302A CN 103912302 A CN103912302 A CN 103912302A CN 201410037866 A CN201410037866 A CN 201410037866A CN 103912302 A CN103912302 A CN 103912302A
- Authority
- CN
- China
- Prior art keywords
- gas
- hydraulic
- pressure
- coal
- boring
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Abstract
Provided is a seam-penetrating drilling hydrofracturing gas extracting method. The method includes that a target drill hole and a hole for penetrating a coal seam are preset as a hydrofracturing free surface; a chambering section of the target drill hole is expanded, and a sleeve is put into the drill hole, fixed and connected with a separating chamber. High-pressure water enters the fracturing drill hole to fracture a coal body, and a fracturing gap is gradually expanded until the gap is communicated with the hole. The water pressure and water amount are increased, and the coal body around the gap is washed. Water flow carries gas and the coal body to pass through the target drill hole to enter the chamber, the gas is extracted, and separation of the gas is achieved. After the coal body is washed, a macro gap communicating the fracturing drill hole and the target drill hole is formed. During extraction, the gas leaks into the gap, flows into the target drill hole and the hydrofracturing drill hole, and a gas flowing mode is changed fundamentally. The gap is equivalent to extension of the length of the target drill hole and the hydrofracturing drill hole in the coal seam, contact area between the gap and the coal body is increased, and a gas extraction effect can be improved.
Description
Technical field
The present invention relates to a kind of crossing-hole gas extraction, particularly a kind of hydraulic rupture networking layer-through drilling method that is applicable to coal bed gas extraction.
Background technology
Along with the increase of mining depth, coal-bed gas pressure and content increase, and ature of coal is soft, and gas permeability of coal seam is low, and coal-bed gas is difficult for extraction before adopting, and coal and gas outburst risk are on the rise, and China has become the most serious outstanding producing coal country in the world.In order to eliminate the outburst hazard in coal seam before adopting, make high Coal Seam Prone To Outburst be converted into present low gas coal seam, need to adopt regional gas pumping method.It is that the intensive layer-through drilling band of floor roadway is taken out in advance in conjunction with concordant boring and taken out in advance that the regionality that at present colliery scene extensively adopts is taken out coal-bed gas method in advance.China coal seam has experienced strong tectonic movement more, poor permeability, and extraction radius is little, and in order to shorten the time of pre-gas pumping, layer-through drilling spacing is generally 3～5m.The control range that " control coal and Gas Outburst specify " takes out in advance to coal road band, more than 35m, therefore screens the layer-through drilling of coal road band conventionally more than layout 7 rows.
In addition, layer-through drilling is taken out the deficiency that has two aspects in advance: 1) the rock segment length of boring, and coal seam section is short, and the utilization rate of boring is low; 2) layer-through drilling is isolated existence, and when extraction, gas enters boring with the form of seepage flow, and each hole pumping and mining is the coal body in control range separately, between boring, without contacting directly, causes the engineering quantity of layer-through drilling mash gas extraction large, and extraction efficiency is low.Therefore while, adopting the method, need coordinate the anti-reflection measure in corresponding coal seam.
Summary of the invention
Technical problem: the object of the invention is to overcome the weak point in prior art, the engineering quantity that a kind of method is simple, reduce layer-through drilling mash gas extraction is provided, improve the layer-through drilling hydraulic rupture gas pumping method of extraction efficiency.
Technical scheme: layer-through drilling hydraulic rupture gas pumping method of the present invention, comprises the steps:
A, apart from seat earth 20m～30m, compose deposit stable rock gangway in construction diameter be 100mm target borehole, technology is implemented reaming to the coal seam section of target borehole routinely, forms target hole;
B, the reaming that length is 1.5m is carried out in the aperture of target borehole, counter bore diameter is 130mm, lays the sleeve pipe that diameter is 100mm in reaming section, and uses accelerated cement fixed sleeving, then sleeve port with high-pressure rubber pipe with separate chamber and be connected;
C, in target borehole both sides respectively to hydraulic rupture boring of coal seam direction construction, the diameter of hydraulic rupture boring is 90mm, the terminal of hydraulic rupture boring and the spacing of target hole 3 are 15～20m;
D, the high pressure water injection pipe that placement diameter is 50mm in hydraulic rupture boring, high pressure water injection pipe enters the 1/3 thickness place in coal seam; To the annular gap cementing mortar between high pressure water injection pipe and hydraulic rupture boring, fixing high pressure water injection pipe;
E, high pressure water injection pipe is connected with high-pressure hydraulic pump with high-pressure hose, opens high-pressure hydraulic pump, provide water under high pressure to coal seam, coal body breaks;
F, the variation of recording hydraulic pressure, discharge, when hydraulic pressure declines 30% or target borehole there are flowing out time, strengthen hydraulic pressure, the water yield of high-pressure hydraulic pump, wash away coal body, current carry gas and enter and separate chamber through hole, target borehole with coal body, gas is taken away the gas separating in chamber by extraction pipeline, realize coal, gas separates with water;
G, while continuing to go out without coal body, close high-pressure hydraulic pump, stop hydraulic rupture; Flow and concentration according to extraction pipeline are calculated the gas amount of extracting out, weigh the coal amount that separates precipitation in chamber, analyze hydraulic rupture effect;
H, sealing target borehole and hydraulic rupture boring, and they are connected to methane gas extraction pipeline, the gas in extraction hydraulic rupture scope coal body.
The pressure of supply water of described high-pressure hydraulic pump more than 25MPa, the water yield is at 15m
3more than/h.
Beneficial effect: the present invention is directed to and take out in advance that the layer-through drilling utilization rate of coal-bed gas is low, mutually isolatedly between boring cause the present situation that pre-pumping efficiency is low, the default target borehole (hole) that penetrates coal seam, as the scope of freedom of hydraulic rupture; Arrange hydraulic rupture boring at distance objective boring 15～20m place (distance in coal seam), note water under high pressure breaks, washes away coal body, between hydraulic rupture boring and target borehole, form interconnective macrocrack passage, improve the gas permeability of hydraulic rupture influence basin coal body, change Gas Flow pattern, improve gas pumping effect.The method is produced macroscopical crack between layer-through drilling, easy construction, and common laborer can complete; Overcome that layer-through drilling takes out that coal-bed gas boring utilization rate is low in advance, isolated adverse effect mutually between boring, coal-bed gas desorb first macrocrack between holing with hydraulic rupture of target approach boring, enter layer-through drilling again, covert prolongation the length of layer-through drilling, having there is the change of essence in Gas Flow pattern, can significantly improve gas pumping efficiency.
Brief description of the drawings
Fig. 1 is hydraulic rupture gas pumping method schematic diagram of the present invention.
In figure: 1-coal seam; 2,2 '-crack; 3-target hole; 4,4 '-hydraulic rupture boring; 5-target borehole; 6-high pressure water injection pipe; 7-reaming section; 8-floor roadway; 9-high-pressure hydraulic pump; 10-separates chamber; 11-extraction pipeline.
Detailed description of the invention
Below in conjunction with accompanying drawing, one embodiment of the present of invention are further described:
As shown in Figure 1, the method for hydraulic rupture draining coal seam gas of the present invention, concrete steps are as follows:
A, the target borehole that penetrates coal seam 15 that construction diameter is 100mm in depositing stable rock gangway 8 apart from coal seam 1 base plate 20m～30m, tax, technology is implemented reaming to the coal seam section of target borehole 5 routinely, forms target hole 3;
B, target borehole 5 aperture sections are carried out to reaming, reaming length is 1.5m, and counter bore diameter is 130mm, and in reaming section, laying diameter is the sleeve pipe 7 of 100mm, and with accelerated cement fixed sleeving 7, then uses high-pressure rubber pipe splicing sleeve 7 and separate chamber 10;
C, in target borehole 5 both sides respectively to hydraulic rupture boring 4 of coal seam direction construction, the diameter of hydraulic rupture boring 4 is 90mm, the terminal of hydraulic rupture boring 4 and the spacing of target hole 3 are 15～20m;
D, at the hydraulic rupture high pressure water injection pipe 6 that 4 interior placement diameters are 50mm of holing, until high pressure water injection pipe 6 enters into 1/3 thickness place, coal seam, afterwards, carry out sealing of hole, fixing high pressure water injection pipe 6 to cementing mortar in the annular gap between high pressure water injection pipe 6 and hydraulic rupture boring 4;
E, connect high pressure water injection pipe 6 and high-pressure hydraulic pump 9 with high-pressure hose, the pressure of supply water of high-pressure hydraulic pump 9 more than 25MPa, the water yield is at 15m
3water under high pressure more than/h, opens high-pressure hydraulic pump 9 and provides water under high pressure to coal seam 1, and coal body breaks; After hydraulic rupture, the flow regime of coal-bed gas changes, Coalbed Gas Seepage enters crack 2, flow into again target borehole 5 and hydraulic rupture boring 4, the existence in crack 2 has been equivalent to extend target borehole 5 and the length of hydraulic rupture boring 4 in coal seam, increase and the contact area in coal seam, can improve gas pumping effect;
F, the variation of recording hydraulic pressure, discharge, when hydraulic pressure declines 30% or target borehole 5 there are flowing out time, show to break and formed perforation crack between boring 4 and target borehole 5, now strengthen hydraulic pressure, the water yield of high-pressure hydraulic pump 9, wash away and connect crack coal body around, current carry gas and coal body and finally enter and separates in chamber 10 through hole 3, target borehole 5, and the gas in methane gas extraction pipeline 11 is taken separation chamber 10 away is realized separating of gas and coal body and water;
G, along with the increase of going out coal body amount in target borehole 5, the macrocrack that is interconnected of formation progressively between break boring 4 and target borehole 5, closes high-pressure hydraulic pump 9, stops hydraulic rupture; The flow and the densimeter that show according to extraction pipeline 11 pressure gauges calculate the gas amount of extraction, and separate the coal amount of chamber 10 interior precipitations by weighing, analyze hydraulic rupture effect;
H, sealing target borehole 5 and hydraulic rupture boring 4, and they are connected respectively to methane gas extraction pipeline, carry out the gas pumping in hydraulic rupture scope coal body.
Shown in Fig. 1: solid arrow is water (flow) direction; Dotted arrow is the flow direction of water, gas and coal; Hydraulic rupture boring 4 ' is complete for the construction of breaking, and has formed crack 2 ' between hole; Hydraulic rupture boring 4 is for carrying out hydraulic rupture, and crack 2 is forming.
Claims (2)
1. a layer-through drilling hydraulic rupture gas pumping method, is characterized in that comprising the steps:
A, apart from coal seam (1) base plate 20m～30m, compose deposit stable rock gangway (8) in construction diameter be 100mm target borehole (5), technology is implemented reaming to the coal seam section of target borehole (5) routinely, formation target hole (3);
B, the reaming that length is 1.5m is carried out in the aperture of target borehole (5), counter bore diameter is 130mm, in reaming section, lay the sleeve pipe that diameter is 100mm (7), and with accelerated cement fixed sleeving (7), then sleeve pipe (7) port with high-pressure rubber pipe with separate chamber (10) and be connected;
C, in target borehole (5) both sides respectively to a hydraulic rupture boring of coal seam direction construction (4), hydraulic rupture boring (4) diameter is 90mm, and the hydraulic rupture boring terminal of (4) and the spacing of target hole (3) are 15～20m;
D, the high pressure water injection pipe (6) that placement diameter is 50mm in hydraulic rupture boring (4), high pressure water injection pipe (6) enters the 1/3 thickness place in coal seam; To the annular gap cementing mortar between high pressure water injection pipe (6) and hydraulic rupture boring (4), fixing high pressure water injection pipe (6);
E, high pressure water injection pipe (6) is connected with high-pressure hydraulic pump (9) with high-pressure hose, opens high-pressure hydraulic pump (9), to coal seam, (1) provides water under high pressure, and coal body breaks;
F, the variation of recording hydraulic pressure, discharge, when hydraulic pressure declines 30% or target borehole (5) there are flowing out time, show to break and formed perforation crack between boring (4) and target borehole (5), now strengthen hydraulic pressure, the water yield of high-pressure hydraulic pump (9), wash away and connect crack coal body around, current carry gas and finally enter and separate in chamber (10) through hole (3), target borehole (5) with coal body, take through methane gas extraction pipeline (11) gas separating in chamber (10) away, realize separating of gas and coal body and water;
G, current scour go out coal body, break and progressively form the macrocrack being interconnected between boring (4) and target borehole (5), and while continuing to go out without coal body, high-pressure hydraulic pump (9) is progressively closed, and stops hydraulic rupture; Flow and concentration according to extraction pipeline (11) are calculated the gas amount of extracting out, weigh the coal amount that separates precipitation in chamber (10), analyze hydraulic rupture effect;
H, sealing target borehole (5) and hydraulic rupture boring (4), and they are connected to methane gas extraction pipeline (11), the gas in extraction hydraulic rupture scope coal body.
2. layer-through drilling hydraulic rupture gas pumping method according to claim 1, is characterized in that: the pressure of supply water of described high-pressure hydraulic pump (9) more than 25MPa, the water yield is at 15m
3more than/h.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410037866.XA CN103912302B (en) | 2014-01-26 | 2014-01-26 | A kind of layer-through drilling hydraulic rupture gas pumping method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410037866.XA CN103912302B (en) | 2014-01-26 | 2014-01-26 | A kind of layer-through drilling hydraulic rupture gas pumping method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103912302A true CN103912302A (en) | 2014-07-09 |
| CN103912302B CN103912302B (en) | 2016-01-13 |
Family
ID=51038267
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410037866.XA Expired - Fee Related CN103912302B (en) | 2014-01-26 | 2014-01-26 | A kind of layer-through drilling hydraulic rupture gas pumping method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103912302B (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104763462A (en) * | 2015-04-07 | 2015-07-08 | 中国矿业大学 | Method for extracting high-pressure hydraulic cave-manufacturing gas from rock roadway crossing hole |
| CN105484790A (en) * | 2015-11-24 | 2016-04-13 | 中国矿业大学 | Method for promoting gas extraction and working face dust fall by injecting water at intervals in drilling holes |
| CN106285599A (en) * | 2016-08-05 | 2017-01-04 | 河南能源化工集团研究院有限公司 | A kind of waterpower changing of the relative positions release anti-reflection draining coal seam gas method |
| CN106567710A (en) * | 2016-10-18 | 2017-04-19 | 安徽理工大学 | Rapid coal uncovering method with effects of uniform pressure releasing and integrated collapse |
| CN108894728A (en) * | 2018-07-27 | 2018-11-27 | 淮南矿业(集团)有限责任公司 | A kind of construction method of gas drainage directional long borehole group and directional long borehole |
| CN112392538A (en) * | 2020-11-18 | 2021-02-23 | 太原理工大学 | Progressive shield type bedding hydraulic cave construction method for tunneling working face of structural coal seam |
| CN114635678A (en) * | 2022-02-24 | 2022-06-17 | 东北大学 | Microorganism and hydraulic fracturing coal seam permeability increasing system and method |
| CN115492563A (en) * | 2022-09-27 | 2022-12-20 | 中煤科工集团重庆研究院有限公司 | Multi-drill-hole through type fracturing, punching, permeation increasing and pressure relieving device and method for soft coal seam |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101644166A (en) * | 2009-07-14 | 2010-02-10 | 中国矿业大学 | Method for extracting gas from high gas low permeability coal seam by punching, slotting, pressure releasing, and permeability increasing |
| CN102071920A (en) * | 2010-12-30 | 2011-05-25 | 河南理工大学 | Gas extraction equipment and method for low coal penetration layer |
| CN102213077A (en) * | 2011-05-25 | 2011-10-12 | 煤炭科学研究总院沈阳研究院 | Coal seam reaming system using three-dimensional (3D) swirling water jet and reaming and fracturing method for permeability enhancement |
| CN102493833A (en) * | 2011-11-25 | 2012-06-13 | 重庆市能源投资集团科技有限责任公司 | Depressurized extraction method for cutting through roof or floor of coal seam by abrasive water jet |
| CN102619552A (en) * | 2012-02-24 | 2012-08-01 | 煤炭科学研究总院沈阳研究院 | Directional hydraulic pressing penetration, permeability increase and outburst elimination method of guide groove |
| CN103362538A (en) * | 2013-07-15 | 2013-10-23 | 中国矿业大学 | Pressure alternate gas exhausting method by slotting and fracturing coal seams |
-
2014
- 2014-01-26 CN CN201410037866.XA patent/CN103912302B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101644166A (en) * | 2009-07-14 | 2010-02-10 | 中国矿业大学 | Method for extracting gas from high gas low permeability coal seam by punching, slotting, pressure releasing, and permeability increasing |
| CN102071920A (en) * | 2010-12-30 | 2011-05-25 | 河南理工大学 | Gas extraction equipment and method for low coal penetration layer |
| CN102213077A (en) * | 2011-05-25 | 2011-10-12 | 煤炭科学研究总院沈阳研究院 | Coal seam reaming system using three-dimensional (3D) swirling water jet and reaming and fracturing method for permeability enhancement |
| CN102493833A (en) * | 2011-11-25 | 2012-06-13 | 重庆市能源投资集团科技有限责任公司 | Depressurized extraction method for cutting through roof or floor of coal seam by abrasive water jet |
| CN102619552A (en) * | 2012-02-24 | 2012-08-01 | 煤炭科学研究总院沈阳研究院 | Directional hydraulic pressing penetration, permeability increase and outburst elimination method of guide groove |
| CN103362538A (en) * | 2013-07-15 | 2013-10-23 | 中国矿业大学 | Pressure alternate gas exhausting method by slotting and fracturing coal seams |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104763462A (en) * | 2015-04-07 | 2015-07-08 | 中国矿业大学 | Method for extracting high-pressure hydraulic cave-manufacturing gas from rock roadway crossing hole |
| CN105484790A (en) * | 2015-11-24 | 2016-04-13 | 中国矿业大学 | Method for promoting gas extraction and working face dust fall by injecting water at intervals in drilling holes |
| CN106285599A (en) * | 2016-08-05 | 2017-01-04 | 河南能源化工集团研究院有限公司 | A kind of waterpower changing of the relative positions release anti-reflection draining coal seam gas method |
| CN106285599B (en) * | 2016-08-05 | 2018-06-29 | 河南能源化工集团研究院有限公司 | A kind of anti-reflection draining coal seam gas method of waterpower changing of the relative positions release |
| CN106567710A (en) * | 2016-10-18 | 2017-04-19 | 安徽理工大学 | Rapid coal uncovering method with effects of uniform pressure releasing and integrated collapse |
| CN108894728A (en) * | 2018-07-27 | 2018-11-27 | 淮南矿业(集团)有限责任公司 | A kind of construction method of gas drainage directional long borehole group and directional long borehole |
| CN112392538A (en) * | 2020-11-18 | 2021-02-23 | 太原理工大学 | Progressive shield type bedding hydraulic cave construction method for tunneling working face of structural coal seam |
| CN114635678A (en) * | 2022-02-24 | 2022-06-17 | 东北大学 | Microorganism and hydraulic fracturing coal seam permeability increasing system and method |
| CN115492563A (en) * | 2022-09-27 | 2022-12-20 | 中煤科工集团重庆研究院有限公司 | Multi-drill-hole through type fracturing, punching, permeation increasing and pressure relieving device and method for soft coal seam |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103912302B (en) | 2016-01-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103912302A (en) | Seam-penetrating drilling hydrofracturing gas extracting method | |
| CN103821544B (en) | Tunneling and underground engineering high-pressure high-flow is dashed forward Water outburst treatment method | |
| CN101575983B (en) | Directional fracturing permeability improvement outburst elimination method in coal mine and device thereof. | |
| CN110397428B (en) | Displacement coalbed methane yield increasing method for coalbed methane jointly mined by vertical well and U-shaped butt well | |
| CN103696800B (en) | A kind of brill cuts pressure and takes out method | |
| CN104234740B (en) | A kind of low middle pressure air displacement high pressure coal seam gas train and method thereof | |
| CN103541710A (en) | Method for forcedly draining gas from underground gas and liquid alternate phase-drive fracture coal of coal mine | |
| CN104389631A (en) | Slotting and fracturing cooperation networking permeability increasing method for low-permeability coal seam | |
| CN102155254A (en) | Method for extracting gas in low air permeability coal layer by pulse fracture anti-reflection | |
| CN104653161A (en) | Coal mine underground pulse hydraulic slot cutting-fracturing integral anti-reflection extraction device and method | |
| CN105239984B (en) | A kind of coal mine underground fracturing crack extends control method | |
| CN102022104A (en) | Open-hole packer for open-hole horizontal well and preset connector fracturing well completion method | |
| CN204754895U (en) | Device is adopted to colliery slot of pulse water conservancy in pit - anti -reflection taking out of fracturing integration | |
| CN107587529B (en) | Gas-water pressure balanced type underground anti-seepage sealing technique and equipment used | |
| CN101793154A (en) | Method for grouting for stopping up water by using geological parameters of tunnel surrounding rocks and setting relief holes | |
| CN105351001A (en) | Gas extraction method for region reinforcement of gob-side entry retaining | |
| CN205858333U (en) | A kind of three plug hydraulic fracturing detecting earth stress systems | |
| CN106930746A (en) | The alternative expression coal seam anti-reflection method that drilling acetone invasion and attack are combined with hydraulic fracturing | |
| CN102434192A (en) | Device and method for enhancing coal seam fracturing effect | |
| CN104234682B (en) | A kind ofly be applicable to separate stratum fracturing of continuous oil pipe method that is many, girdle | |
| CN103195470B (en) | Drilling construction Gas gathering-device | |
| CN107227740A (en) | The construction method that limestone cave cell wall is closed in construction of diaphragm wall | |
| CN102817594B (en) | Horizontal well water pumping gas production method and device | |
| CN204960882U (en) | Underground hydraulic fracturing drill hole sealing device of coal mine | |
| Miao et al. | Development status and prospect of staged fracturing technology in horizontal wells |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB03 | Change of inventor or designer information |
Inventor after: Zhang Rong Inventor after: Zhou Hongxing Inventor after: Cheng Yuanping Inventor after: Liu Qingquan Inventor after: Dai Hao Inventor before: Zhou Hongxing Inventor before: Liu Qingquan Inventor before: Zhang Rong Inventor before: Cheng Yuanping Inventor before: Dai Hao |
|
| COR | Change of bibliographic data | ||
| CB03 | Change of inventor or designer information |
Inventor after: Zhou Hongxing Inventor after: Zhang Rong Inventor after: Cheng Yuanping Inventor after: Liu Qingquan Inventor after: Dai Hao Inventor before: Zhang Rong Inventor before: Zhou Hongxing Inventor before: Cheng Yuanping Inventor before: Liu Qingquan Inventor before: Dai Hao |
|
| COR | Change of bibliographic data | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160113 Termination date: 20170126 |