CN105064969A - Fracturing method capable of preventing induction outburst - Google Patents
Fracturing method capable of preventing induction outburst Download PDFInfo
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- CN105064969A CN105064969A CN201510510073.XA CN201510510073A CN105064969A CN 105064969 A CN105064969 A CN 105064969A CN 201510510073 A CN201510510073 A CN 201510510073A CN 105064969 A CN105064969 A CN 105064969A
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Abstract
The invention discloses a fracturing method capable of preventing induction outburst. By the adoption of the method, gas drainage amount can be increased, and the risk caused during drainage can be reduced. According to the technical scheme, two or more drainage holes are selected to serve as the minimum drainage unit within the range allowed by the coal mine outburst prevention regulation firstly, the distance between every two adjacent drainage holes in the drainage unit is not larger than 5 m, intercept holes are formed in the two edges of the drainage unit, and a flow and gas pressure measurement instrument is installed on any drainage hole in the drainage unit; then one or more fracture causing holes are punched in the two or more drainage units, the depth of the fracture causing holes is similar to that of the drainage holes, cracking is conducted in sequence after punching, and the fracture causing holes are opened after drainage data are stable, and the diameter of the fracture causing holes is not larger than 75 mm. The method can be widely applied to outburst coal mines and can also be used for effectively controlling gas and preventing coal and gas from outburst.
Description
Technical field
A kind of can preventing of the present invention induces outstanding fracturing process, is specifically related to colliery projecting mine, effectively administers gas, prevent coal and gas prominent.
Background technology
At present both at home and abroad scientific research institutions, colleges and universities have developed many rock stratum, coal seam is anti-reflection strengthening shale gas, the method for gas drainage under suction, technology and equipment, comprise deep hole carbon dioxide Pre-splitting Blasting Technique, hydraulic fracturing technology.These technology all have a fatal weakness, produce induction exactly to the region that there is outburst danger source, and outstanding accident occurs in unpredictable situation.
Summary of the invention
Instant invention overcomes the deficiency that prior art exists, provide a kind of can preventing and induce outstanding fracturing process, the method not only can improve the amount of extraction gas, and can also reduce the danger occurred in extraction process.
In order to solve the problems of the technologies described above, the technical solution used in the present invention is: a kind of can preventing induces outstanding fracturing process, performs in the steps below:
The first step: select two or more extraction hole as minimum one group of extraction unit in the scope that colliery protrusion-dispelling code allows, in described extraction unit, adjacent extraction pitch-row is from being no more than 5 meters, interception hole is set on two borders of described extraction unit, and selects flow measurement and gas pressure instrument are installed in arbitrary extraction hole in described extraction unit.
Second step: beat one or more fracturing hole close with extraction hole depth in the middle of two or more described extraction unit, fracturing successively after having punched, after extraction data stabilization, seal off fracturing hole again, described fracturing bore dia is not more than 75 millimeters.
When carrying out the construction of one or more fracturing hole, the twice that code allows minimum value can be amplified in fracturing region, still needing to arrange interception hole at extraction elementary boundary, is two or more fracturing hole fracturings successively in principle.
When carrying out the construction of two or more fracturing hole, expand fracturing region successively, fracturing region is once no more than 60 meters.
The beneficial effect that the present invention compared with prior art has is: the present invention is after taking rational Regional, in the region that two or more are controlled, pressure break accesses drainage system after administering, gas pressure in rapid reduction region, the a large amount of free gas gases produced due to pressure break are taken away with drainage system, this region also form a present low gas region, adjacent coal body is under the driving of gas high pressure and high concentration, produce more crack, gas, to low pressure and low concentration region flowing, closes on for what may exist the passage that outstanding source produces a slowly-releasing gradually.Adjacent extraction pipeline is installed gas pressure table and flow monitoring instrument, pressure and flow parameter basicly stable rear just can carry out on once pressure break, fracture zone and pressure break dynamics can be greater than initial improvement region twice next time, interception hole also to be set at next fracture zone terminal, prevent pressure break to be transmitted to uncontrollable region.Be characterized in artificially arranging zone of control and two or more regions must be had to produce synergistic effect at concurrent fracturing as far as possible, deriving passage in local in order for the adjacent outstanding source that may exist produces.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the present invention is described further.
Fig. 1 is structural representation of the present invention.
Detailed description of the invention
A kind of can preventing of the present invention induces outstanding fracturing process, performs in the steps below:
The first step: select two or more extraction hole as minimum one group of extraction unit in the scope that colliery protrusion-dispelling code allows, in described extraction unit, adjacent extraction pitch-row is from being no more than 5 meters, interception hole is set on two borders of described extraction unit, and selects flow measurement and gas pressure instrument are installed in arbitrary extraction hole in described extraction unit.
Second step: beat one or more fracturing hole close with extraction hole depth in the middle of two or more described extraction unit, fracturing successively after having punched, after extraction data stabilization, seal off fracturing hole again, described fracturing bore dia is not more than 75 millimeters.
When carrying out the construction of one or more fracturing hole, the twice that code allows minimum value can be amplified in fracturing region, still needing to arrange interception hole at extraction elementary boundary, is two or more fracturing hole fracturings successively in principle.
When carrying out the construction of two or more fracturing hole, expand fracturing region successively, fracturing region is once no more than 60 meters.
Operating principle of the present invention is after taking rational Regional, in the region that two or more are controlled, pressure break accesses drainage system after administering, gas pressure in rapid reduction region, the a large amount of free gas gases produced due to pressure break are taken away with drainage system, this region also form a present low gas region, adjacent coal body is under the driving of gas high pressure and high concentration, produce more crack, gas, to low pressure and low concentration region flowing, closes on for what may exist the passage that outstanding source produces a slowly-releasing gradually.Adjacent extraction pipeline is installed gas pressure table and flow monitoring instrument, pressure and flow parameter basicly stable rear just can carry out on once pressure break, fracture zone and pressure break dynamics can be greater than initial improvement region twice next time, interception hole also to be set at next fracture zone terminal, prevent pressure break to be transmitted to uncontrollable region.According to construction experience, the direct effective radius of each pressure break is about 30 meters, but forms quick region of flowing at about 5 meters, within about 20 days, can reach 30 meters in pressure break.
Feature of the present invention artificially arranges zone of control and two or more regions must be had to produce synergistic effect at concurrent fracturing as far as possible, deriving passage in local in order for the adjacent outstanding source that may exist produces.
Shown by great number tested data, after pressure break, certain time has a several or extraction hole data anomaly, and this phenomenon is that the pure flow of this hole gas can reach 5000-15000 cube in one day or two days.That is may be derived in order in a gas source.If but imagination is just in time in this outstanding source region pressure break, be bound to produce terrible consequences.Of the present inventionly to implement pressure break in controlled scope exactly, by data analysis, safe construction.
The definition in the effective extraction hole mentioned in the present invention does not produce with adjacent extraction hole and tunnel air when the extraction of blind hole sealed negative-pressure to link up.
By reference to the accompanying drawings embodiments of the invention are explained in detail above, but the present invention is not limited to above-described embodiment, in the ken that those of ordinary skill in the art possess, various change can also be made under the prerequisite not departing from present inventive concept.
Claims (3)
1. can prevent from inducing an outstanding fracturing process, it is characterized in that, perform in the steps below:
The first step: select two or more extraction hole as minimum one group of extraction unit in the scope that colliery protrusion-dispelling code allows, in described extraction unit, adjacent extraction pitch-row is from being no more than 5 meters, interception hole is set on two borders of described extraction unit, and selects flow measurement and gas pressure instrument are installed in arbitrary extraction hole in described extraction unit;
Second step: beat one or more fracturing hole close with extraction hole depth in the middle of two or more described extraction unit, fracturing successively after having punched, after extraction data stabilization, seal off fracturing hole again, described fracturing bore dia is not more than 75 millimeters.
2. a kind of can preventing according to claim 1 induces outstanding fracturing process, it is characterized in that, when carrying out the construction of one or more fracturing hole, the twice that code allows minimum value can be amplified in fracturing region, still needing to arrange interception hole at extraction elementary boundary, is two or more fracturing hole fracturings successively in principle.
3. a kind of can preventing according to claim 2 induces outstanding fracturing process, it is characterized in that, when carrying out the construction of two or more fracturing hole, expand fracturing region successively, fracturing region is once no more than 60 meters.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510510073.XA CN105064969A (en) | 2015-08-19 | 2015-08-19 | Fracturing method capable of preventing induction outburst |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510510073.XA CN105064969A (en) | 2015-08-19 | 2015-08-19 | Fracturing method capable of preventing induction outburst |
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| CN105064969A true CN105064969A (en) | 2015-11-18 |
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| CN201510510073.XA Pending CN105064969A (en) | 2015-08-19 | 2015-08-19 | Fracturing method capable of preventing induction outburst |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107178389A (en) * | 2017-06-21 | 2017-09-19 | 永城煤电控股集团有限公司 | Coal mine gas drainage Deephole pre-splitting blasting permeability improvement device and its method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050183859A1 (en) * | 2003-11-26 | 2005-08-25 | Seams Douglas P. | System and method for enhancing permeability of a subterranean zone at a horizontal well bore |
| CN102678092A (en) * | 2012-04-01 | 2012-09-19 | 河南省煤层气开发利用有限公司 | Method for commonly extracting coal and coal bed gas by up-hole and down-hole joint construction |
| CN103670498A (en) * | 2013-12-25 | 2014-03-26 | 安徽浩惠能源科技有限公司 | Pre-pumping outburst prevention technology utilizing drill hole instead of stone drift |
| CN104594868A (en) * | 2015-01-29 | 2015-05-06 | 河南理工大学 | Multi-point control hydraulic fracturing, permeability-increasing and outburst-eliminating method |
-
2015
- 2015-08-19 CN CN201510510073.XA patent/CN105064969A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050183859A1 (en) * | 2003-11-26 | 2005-08-25 | Seams Douglas P. | System and method for enhancing permeability of a subterranean zone at a horizontal well bore |
| CN102678092A (en) * | 2012-04-01 | 2012-09-19 | 河南省煤层气开发利用有限公司 | Method for commonly extracting coal and coal bed gas by up-hole and down-hole joint construction |
| CN103670498A (en) * | 2013-12-25 | 2014-03-26 | 安徽浩惠能源科技有限公司 | Pre-pumping outburst prevention technology utilizing drill hole instead of stone drift |
| CN104594868A (en) * | 2015-01-29 | 2015-05-06 | 河南理工大学 | Multi-point control hydraulic fracturing, permeability-increasing and outburst-eliminating method |
Non-Patent Citations (1)
| Title |
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| 胡磊: "难抽放煤层工作面回采期间瓦斯抽放技术", 《实用技术》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107178389A (en) * | 2017-06-21 | 2017-09-19 | 永城煤电控股集团有限公司 | Coal mine gas drainage Deephole pre-splitting blasting permeability improvement device and its method |
| CN107178389B (en) * | 2017-06-21 | 2018-12-21 | 永城煤电控股集团有限公司 | Coal mine gas drainage Deephole pre-splitting blasting permeability improvement device and its method |
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Application publication date: 20151118 |
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