CN101215964A - Coal seam depth deflagration method - Google Patents
Coal seam depth deflagration method Download PDFInfo
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- CN101215964A CN101215964A CNA2008100100358A CN200810010035A CN101215964A CN 101215964 A CN101215964 A CN 101215964A CN A2008100100358 A CNA2008100100358 A CN A2008100100358A CN 200810010035 A CN200810010035 A CN 200810010035A CN 101215964 A CN101215964 A CN 101215964A
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Abstract
The invention relates to a low pressure gas layer and gas fracturing method, in particular to a coal seam deep deflagration method. The method comprises the following steps: nitryl liquid is injected to a coal seam, and then solid grain is fed into the coal seam; a lighting-off torch is cast to ignite starting mix, thus producing high temperature and high pressure to produce powerful impact on the coal seam; in addition, radial crack and high-temperature baking are produced, and the coal seam is restructured. As by adopting the invention, a natural fracture of the coal seam can be communicated; an original fracture can be unplugged; and deposited contamination particle is removed to form multiple fractures. In addition, water lock in the coal seam is eliminated, and seam pressure is increased to cause local cracking, thus forming high yield conditions for production of more coal-seam gas, and creating conditions for development of low pressure coal-seam gas.
Description
Technical field:
The present invention relates to low-pressure gas layer, gas pressure-cracking method, especially a kind of coal seam depth deflagration method.
Background technology:
Along with going deep into of oil field development, crude output is decayed day by day, for developing alternative new forms of energy, constantly in the coal seam, constantly find to have the existence of natural-gas in recent years, but because coal seam porosity and poor permeability, most of coal bed gas is present among the crack, coal seam, make gas be difficult for overflowing, for this reason, the present invention attempts to adopt blasting method that coal seam gas is carried out pressure break to make seam, thereby reaches the volume increase purpose.
Summary of the invention:
The objective of the invention is to overcome above-mentioned shortcoming, and a kind of coal seam depth deflagration method that provides, this method can be carried out pressure break to the low yield coal seam by depth deflagration method and be made seam, thereby improves the output of coal bed gas.
Technical scheme:
The task of Ti Chuing for achieving the above object, with 900-1000 rice position, coal seam, the thick 20-30 rice in coal seam was as the criterion when the present invention constructed, and implementation step is as follows:
1.1, trip out tubing string in the former well;
1.2, determine the definite degree of depth of sand face with Φ 105 drift size gauge tool driftings sand face to the well;
1.3, connect the solid gunpowder device and be lowered to the tubing string that has solid medicine, the well head of packing into then;
1.4, positive well-flushing is till the water outlet of well head sleeve pipe, if leakage in the well then adds gel-filled diverting agent;
1.5, formulated fluids medicine A5m
3, liquid medicine B5m
3
1.6, close sleeve gate, fluid drug A4.7m is injected in pressurization
3, inject B4.52m behind the liquid medicine
3, displacement fluid 2.325m reinjects
3, above-mentioned A fluid drug B and liquid medicine are pushed in the coal seam;
1.7, treat borehole pressure diffusion after, inject displacement fluid 0.372m
3, remaining liq medicine B in the pit shaft is pushed in the oil pipe among the sleeve pipe;
1.8, on carry oil pipe the used solid medicine of igniting entered in the liquid medicine, and be in coal seam middle part, tear well head then open, operation team moves away from the well site;
1.9, the cultellation lighted torch;
1.10, in confirming well, light after, closing well is so that heat diffusion, look the high and low well head of opening of casing pressure then, if confirm the unignited fire rod of then pulling out, trip out oil tube repair solid igniter, lower tubular column more then, cultellation lighted torch, still unsuccessful as caber igniting, just need join chemical agent C or D continue igniting can;
1.11, well-flushing sees that with well head clear water is as the criterion about two weeks.
Described fluid drug A is a kind of nitramine liquid explosives that have more stronger quick burning and force of explosion than liquid medicine B;
Liquid medicine B: common nitramine liquid explosives;
Chemical agent C: with chemical agent D is a kind ofly can carry out biochemical reaction and can eliminate the medicament of primary liquid medicine detonation performance with liquid drug.
Solid medicine: be common ammonal;
Starting mix: common gunpowder is produced in Liaoyang.
Operating principle of the present invention is:
Owing to nitro liquid medicine is injected in the crack, coal seam of pressure break and in the intrinsic fracture in coal seam, being lowered to solid powder column caber then lights, make the igniter gunpowder starting mix that ignites, the starting mix instantaneous temperature reaches 2500 ℃-3500 ℃, and burn aluminum pipe, light solid medicine, sustained combustion 0.3 second is also put the burning liquid medicine rapidly, the 2-3 that burns this moment produces instantaneous pressure and reach 50-60MPa second, discharge the about 700L/kg of gas, about 1700 ℃ of maximum temperatures, 600 ℃ of average temperatures can form instantaneous impact to the coal seam and produce radially multiple cracking, again the TRANSIENT HIGH TEMPERATURE baking are carried out in the crack, coal seam simultaneously, produce many warp-wise cracks and a small amount of longitudinal crack around making the coal seam, link up intrinsic fracture and make easier parsing of coal bed gas and circulation.In addition,, eliminate the water lock, and increase coal seam pressure, make coal seam part cracking and produce more coal bed gas because the liquid medicine blast high temperature that produces makes the air bubble expansion in the borehole wall crack.
The present invention compared with prior art has distinguishing feature:
After method of the present invention is used for the coal seam, because burning velocity is very fast, its detonation can produce many tears simultaneously in coal seam around the pit shaft, the long 30-50 rice in crack, make pit shaft pressure drop on every side to greatest extent, thereby improve the coal seam penetrating power, in addition, can replenish water-based fracturing again, particularly by gas shock and TRANSIENT HIGH TEMPERATURE baking to single crack, coal seam deficiency, removed of the blockade of original coal seam venturi water film surface tension force to gas, reduced the pit shaft ambient stress, improved pit shaft percolation ability on every side, be more conducive to gas-liquid two-phase flow to pit shaft, can on basis, fracturing main channel, form radial fissure again, the release area is increased.
Description of drawings:
Fig. 1 is a solid igniting schematic diagram of the present invention.
Fig. 2 is a seam shape schematic diagram after the detonation of coal seam.
Fig. 3 is an aqueous vapor distribution map in the crack, coal seam.
Among the figure by, 1, the solid igniter, 2, fire rod, 3, perforated pipe, 4, ignition charge, 5, starting mix, 6, aluminum pipe, 7, solid medicine, 8, the crack, 9, the coal seam, 10, coal bed gas, 11, water droplet, 12, moisture film, 13, methane forms.
The specific embodiment:
Embodiment 1: during this method construction, at first the oil pipe in the oil well is tripped out, use the drift size gauge tool drifting then, and the definite degree of depth of sand face in definite well, then, connect the solid igniter according to Fig. 1, the structure of this solid igniter is in aluminum pipe 6 ring wall inner chambers, and solid medicine 7 is housed, in aluminum pipe 6 centre bores, starting mix 5 is housed, placing ignition charge 4 at the aluminum pipe upper position, is a perforated pipe 3 that has eyelet above the ignition charge, and primer is housed in the perforated pipe, thus again with this device G.I.H, install well head then and carry out clean-out service construction, well-flushing is till the water outlet of well head sleeve pipe, as finding that leakage need add gel-filled diverting agent in the well, the shutoff loss horizon, after finishing, close sleeve gate, fluid drug A4.7m is injected in pressurization
3, liquid medicine B4.52m
3, inject displacement fluid 2.325m
3, above-mentioned A fluid drug and liquid medicine B are pushed in the coal seam; After treating the borehole pressure diffusion, inject displacement fluid 0.372m
3, from oil pipe, be pushed into remaining liq medicine B in the pit shaft in the sleeve pipe; Carry oil pipe then, the used solid medicine of igniting is entered in the liquid medicine, and be in the coal seam medium position, tear well head then open, operation team moves away from the well site; Drop into fire rod 2 from well head at last; After in confirming well, lighting, closing well is so that heat diffusion, it is high and low to look casing pressure then, opens well head again, if confirm the unignited fire rod of then pulling out, play flowline, maintenance solid igniter, then lower tubular column cultellation lighted torch again is still unsuccessful as the caber igniting, need join chemical agent C or D and carry out after chemical reaction eliminates primary liquid medicine explosion property, igniting just can once more; Carry out well-flushing at last about two weeks, see that to well head clear water is as the criterion, can finish the ignition operation overall process.
Owing to nitro liquid medicine is injected in the crack, coal seam and coal seam intrinsic fracture of pressure break, be lowered to solid medicine 7, throwing lighted torch 2 lights, by the igniter gunpowder starting mix 5 that ignites, instantaneous temperature reaches 2500 ℃-3500 ℃, can form instantaneous impact to the coal seam and produce footpath and many cracks, can carry out the TRANSIENT HIGH TEMPERATURE baking to the crack, coal seam again, make to produce many warp-wise cracks and longitudinal crack on every side, thereby linked up intrinsic fracture, make easier parsing of coal bed gas and circulation like this.In addition,, can eliminate the water lock, increase coal seam pressure, make the local cracking in coal seam produce more coal bed gas because the liquid medicine blast high temperature that produces makes air bubble expansion in the borehole wall crack again.
Claims (2)
1. coal seam depth deflagration method is characterized in that: the execution conditions coal seam: 900-1000 rice position, the thick 20-30 rice in coal seam are the basis, and implementation step is as follows:
1.1, trip out tubing string in the former well;
1.2, determine the definite degree of depth of sand face with Φ 105 drift size gauge tool driftings sand face to the well;
1.3, connect the solid gunpowder device and be lowered to the tubing string that has solid medicine, the well head of packing into then;
1.4, positive well-flushing is till the water outlet of well head sleeve pipe, if leakage in the well then adds gel-filled diverting agent;
1.5, formulated fluids medicine A5m
3, liquid medicine B5m
3
1.6, close sleeve gate, fluid drug A4.7m is injected in pressurization
3, inject B4.52m behind the liquid medicine
3, displacement fluid 2.325m reinjects
3, above-mentioned A fluid drug and liquid medicine B are pushed in the coal seam;
1.7, treat borehole pressure diffusion after, inject displacement fluid 0.372m
3, remaining liq medicine B in the pit shaft is pushed in the oil pipe among the sleeve pipe;
1.8, on carry oil pipe the used solid medicine of igniting entered in the liquid medicine, and be in coal seam middle part, tear well head then open, operation team moves away from the well site;
1.9, the cultellation lighted torch;
1.10, in confirming well, light after, closing well is so that heat diffusion, look the high and low well head of opening of casing pressure then, if confirm the unignited fire rod of then pulling out, trip out oil tube repair solid igniter, then lower tubular column cultellation lighted torch again is still unsuccessful as the caber igniting, just need join chemical agent C or D continue igniting can;
1.11, well-flushing sees that with well head clear water is as the criterion about two weeks.
2. a kind of coal seam depth deflagration method according to claim 1 is characterized in that: described fluid drug A: than liquid medicine B is a kind of nitramine liquid explosives that have more stronger quick burning and force of explosion; Liquid medicine B: be common nitramine liquid explosives; Chemical agent C: with chemical agent D is a kind ofly can carry out biochemical reaction and can eliminate the medicament of the detonation performance of primary liquid medicine with liquid drug; Solid medicine: be common ammonal; Starting mix: common gunpowder is produced in Liaoyang.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100100358A CN101215964A (en) | 2008-01-04 | 2008-01-04 | Coal seam depth deflagration method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100100358A CN101215964A (en) | 2008-01-04 | 2008-01-04 | Coal seam depth deflagration method |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102454397A (en) * | 2010-10-27 | 2012-05-16 | 乌兰察布新奥气化采煤技术有限公司 | Novel solid fuel igniter |
| CN101726571B (en) * | 2008-10-24 | 2012-08-15 | 中国石油天然气集团公司 | Deflagration experimental method and device for gas cloud with concentration gradient in open space |
| CN103080469A (en) * | 2010-05-12 | 2013-05-01 | 普拉德研究及开发股份有限公司 | Methods for unconventional gas reservoir stimulation with stress unloading for enhancing fracture network connectivity |
| CN103781993A (en) * | 2011-06-24 | 2014-05-07 | 伊安·格雷 | Mining method for gassy and low permeability coal seams |
| CN104402659A (en) * | 2014-10-23 | 2015-03-11 | 中国石油大学(华东) | Gunpowder for realizing deep well deep bumming and fracturing |
| CN106382110A (en) * | 2015-09-17 | 2017-02-08 | 中国石油大学(北京) | Intrastratal explosive fracturing ignition ball and fracturing construction method |
| CN111140196A (en) * | 2018-03-12 | 2020-05-12 | 刘屹凡 | Petroleum pipe repairing method |
| CN112523733A (en) * | 2020-11-26 | 2021-03-19 | 河南省煤层气开发利用有限公司 | Outburst elimination method for coal bed gas and coal gasification combined mining area |
| CN113294134A (en) * | 2021-05-31 | 2021-08-24 | 中国矿业大学 | Hydraulic fracturing and methane in-situ blasting synergistic fracturing permeability-increasing method |
| CN114763735A (en) * | 2021-01-14 | 2022-07-19 | 中国石油天然气股份有限公司 | Method for improving permeability of coal reservoir and well pattern structure |
-
2008
- 2008-01-04 CN CNA2008100100358A patent/CN101215964A/en active Pending
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101726571B (en) * | 2008-10-24 | 2012-08-15 | 中国石油天然气集团公司 | Deflagration experimental method and device for gas cloud with concentration gradient in open space |
| CN103080469A (en) * | 2010-05-12 | 2013-05-01 | 普拉德研究及开发股份有限公司 | Methods for unconventional gas reservoir stimulation with stress unloading for enhancing fracture network connectivity |
| CN103080469B (en) * | 2010-05-12 | 2015-11-25 | 普拉德研究及开发股份有限公司 | The method of unconventional gas reservoir simulation is carried out for the stress off-load strengthening fracture network connectedness |
| CN102454397B (en) * | 2010-10-27 | 2015-08-19 | 乌兰察布新奥气化采煤技术有限公司 | A kind of Novel solid fuel igniter |
| CN102454397A (en) * | 2010-10-27 | 2012-05-16 | 乌兰察布新奥气化采煤技术有限公司 | Novel solid fuel igniter |
| CN103781993A (en) * | 2011-06-24 | 2014-05-07 | 伊安·格雷 | Mining method for gassy and low permeability coal seams |
| CN104402659A (en) * | 2014-10-23 | 2015-03-11 | 中国石油大学(华东) | Gunpowder for realizing deep well deep bumming and fracturing |
| CN106382110A (en) * | 2015-09-17 | 2017-02-08 | 中国石油大学(北京) | Intrastratal explosive fracturing ignition ball and fracturing construction method |
| CN106382110B (en) * | 2015-09-17 | 2019-11-08 | 中国石油大学(北京) | A kind of pressing crack construction method for exploding in fracture pressure break |
| CN111140196A (en) * | 2018-03-12 | 2020-05-12 | 刘屹凡 | Petroleum pipe repairing method |
| CN112523733A (en) * | 2020-11-26 | 2021-03-19 | 河南省煤层气开发利用有限公司 | Outburst elimination method for coal bed gas and coal gasification combined mining area |
| CN112523733B (en) * | 2020-11-26 | 2022-11-04 | 河南省煤层气开发利用有限公司 | Outburst elimination method for coal bed gas and coal gasification combined mining area |
| CN114763735A (en) * | 2021-01-14 | 2022-07-19 | 中国石油天然气股份有限公司 | Method for improving permeability of coal reservoir and well pattern structure |
| CN114763735B (en) * | 2021-01-14 | 2023-11-28 | 中国石油天然气股份有限公司 | Method for improving permeability of coal reservoir and well pattern structure |
| CN113294134A (en) * | 2021-05-31 | 2021-08-24 | 中国矿业大学 | Hydraulic fracturing and methane in-situ blasting synergistic fracturing permeability-increasing method |
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Open date: 20080709 |