CN103590801A - Coal bed methane horizontal well nitrogen foam fracturing mining technology - Google Patents
Coal bed methane horizontal well nitrogen foam fracturing mining technology Download PDFInfo
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- CN103590801A CN103590801A CN201310615719.1A CN201310615719A CN103590801A CN 103590801 A CN103590801 A CN 103590801A CN 201310615719 A CN201310615719 A CN 201310615719A CN 103590801 A CN103590801 A CN 103590801A
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 68
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 34
- 239000003245 coal Substances 0.000 title claims abstract description 31
- 239000006260 foam Substances 0.000 title claims abstract description 30
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title abstract description 14
- 238000005516 engineering process Methods 0.000 title abstract description 6
- 238000005065 mining Methods 0.000 title abstract 2
- 239000012530 fluid Substances 0.000 claims abstract description 26
- 239000007788 liquid Substances 0.000 claims abstract description 17
- 239000004576 sand Substances 0.000 claims abstract description 8
- 239000007789 gas Substances 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 12
- 238000004519 manufacturing process Methods 0.000 claims description 11
- 238000010276 construction Methods 0.000 claims description 7
- 238000001802 infusion Methods 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 6
- 238000003825 pressing Methods 0.000 claims description 4
- 238000003795 desorption Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 7
- 230000006378 damage Effects 0.000 abstract description 5
- 238000011084 recovery Methods 0.000 abstract description 4
- 239000003795 chemical substances by application Substances 0.000 abstract 2
- 239000010410 layer Substances 0.000 abstract 2
- 238000005086 pumping Methods 0.000 abstract 1
- 239000002344 surface layer Substances 0.000 abstract 1
- 208000027418 Wounds and injury Diseases 0.000 description 4
- 208000014674 injury Diseases 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 3
- 239000012071 phase Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 230000035699 permeability Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 230000000638 stimulation Effects 0.000 description 1
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- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The invention relates to the technical field of coal bed methane exploration and development, in particular to a coal bed methane horizontal well nitrogen foam fracturing mining technology. The technology comprises the steps that three times of well completion and horizontal section well fixation are adopted for a coal bed methane horizontal well, namely, firstly, a surface of a horizontal well is drilled, and a surface layer sleeve is placed in to seal and fix earth surface easy-leaking stratum; then, a coil layer is drilled to, and a sleeve is placed in to seal and fix stratum above the coal layer section; finally, the horizontal well is drilled, and a sleeve is used for fixing the well. When nitrogen foam fracturing is conducted, two sets of equipment are combined for the operation, one set of equipment is in charge of pumping and injecting fracturing fluid and propping agents, and the other set of equipment pumps and injects nitrogen. The fracturing fluid, the propping agents and nitrogen converge in a high-pressure pipeline at the front end of a wellhead and enter a well barrel through fracturing the well head. The technology achieves the purposes that the horizontal well can be communicated with more cleat and cracks, a single well is large in control area, nitrogen foam greatly reduces the speed of the fracturing liquid filtered into stratum, filter loss is reduced, the harm of the fracturing liquid to the stratum is reduced, the foam fracturing liquid is good in sand carrying performance, flowback effect is good, and coal bed methane yield and recovery efficiency are improved.
Description
Technical field:
The present invention relates to a kind of CBM exploration and development technical field, particularly a kind of coal bed gas horizontal well nitrogen foam pressure break production technique.
Background technology:
CHINESE COAL reservoir has low pressure, hypotonic, low saturated feature, in cbm development, distinct issues are that coal seam permeability is generally lower the most, and most domestic coal bed gas well all adopts straight well exploitation, and the most frequently used well stimulation is waterpower sand fracturing.The target of waterpower sand fracturing is the supporting crack that forms a high flow conductivity in stratum, improves coal seam permeability.Due to the feature of " three is low " in coal seam, when adopting conventional aqueous fracturing fluid to carry out pressure break to coal seam, there is following problem: (1) proppant migration distance is short, near wellbore zone, assemble, limited to reservoir reconstruction; (2) fracturing fluid leakage is serious, and the row of returning is not thorough, and the row of returning leads low, has increased the injury to coal seam, for follow-up coal bed gas extraction process is brought adverse effect; (3) and because conventional aqueous fracturing fluid prop-carrying capacity is limited, reduced bearing length and the flow conductivity in crack, this has all caused the effect of increasing production of coal bed gas well undesirable, and this is also the general not high major reason of current Production of Coal-bed Gas Wells.
Summary of the invention:
The technical problem to be solved in the present invention is to provide a kind of coal bed gas horizontal well nitrogen foam pressure break production technique, this technology has realized horizontal well can link up more hugger and crack, Area of a well is large, and nitrogen foam reduces fracturing fluid greatly to the speed of leak-off in stratum, reduces filter loss, alleviate the injury of fracturing fluid to stratum, foam fracturing fluid is taken grittiness can be good, can construct by high sand ratio, thereby improve crack sanding concentration, flowback effect is good, improves methane output and recovery ratio.Overcome existing straight well Area of a well little limited to reservoir reconstruction with aqueous fracturing fluid, fracturing fluid leakage is serious, and the row of returning leads low, large to the injury in coal seam, the deficiency that prop-carrying capacity is poor.
The technical solution used in the present invention is: a kind of coal bed gas horizontal well nitrogen foam pressure break production technique, this technical step is as follows: coal bed gas horizontal well adopts three to end well, horizontal segment well cementation, that is: one of horizontal hole spud in top layer leakiness stratum, lower surface pipe sealing earth's surface; Two spud in to coal seam, are lowered to sleeve pipe sealing coal seam section with overlying strata; Three horizontal holes that spud in, casing cementing; When carrying out nitrogen foam pressure break, by two groups of device combinations, undertaken, be responsible for infusion fracturing fluid and proppant for one group, another group infusion nitrogen, converges at the high pressure line of well head front end, by fracture well head, enters pit shaft; Ground nitrogen is stored in tank with liquid state, by liquid nitrogen pump vehicle, nitrogen is squeezed into high pressure pipe joint and fracturing fluid is mixed in well during pressing crack construction, and high-pressure pump and evaporimeter by pump truck have just formed foam on ground; After pressure break completes, control flow and carry out open flow, utilize 2 pipelines continuous blow-out release in turn, it is 20～60L/min that the open flow initial stage is controlled open flow flow, until well head pressure, reduce, increase gradually open flow flow after closing up of cracks, during open flow at any time observation well mouth pressure and discharge liquid containing sand situation; Fracturing fluid returns row by nitrogen energy, completes whole fracturing process; After fracturing reform completes, be lowered to numerically controlled reciprocating submersible pump to horizontal segment, control progressively depressurization desorption gas production of liquid level draining.
The invention has the beneficial effects as follows: the present invention is owing to having adopted horizontal well and foam fracturing fluid, thereby horizontal well can be linked up more hugger and crack, Area of a well is large, and nitrogen foam reduces fracturing fluid greatly to the speed of leak-off in stratum, reduces filter loss, alleviate the injury of fracturing fluid to stratum, foam fracturing fluid is taken grittiness can be good, can construct by high sand ratio, thereby improve crack sanding concentration, flowback effect is good, improves methane output and recovery ratio.
The specific embodiment:
A nitrogen foam pressure break production technique, this technical step is as follows: coal bed gas horizontal well adopts three to end well, horizontal segment well cementation, that is: one of horizontal hole spud in top layer leakiness stratum, lower surface pipe sealing earth's surface; Two spud in to coal seam, are lowered to sleeve pipe sealing coal seam section with overlying strata; Three horizontal holes that spud in, casing cementing; When carrying out nitrogen foam pressure break, by two groups of device combinations, undertaken, be responsible for infusion fracturing fluid and proppant for one group, another group infusion nitrogen, converges at the high pressure line of well head front end, by fracture well head, enters pit shaft; Ground nitrogen is stored in tank with liquid state, by liquid nitrogen pump vehicle, nitrogen is squeezed into high pressure pipe joint and fracturing fluid is mixed in well during pressing crack construction, and high-pressure pump and evaporimeter by pump truck have just formed foam on ground; Thereby head of liquid is low, cause the back pressure in shaft bottom lowly, simultaneously the frictional resistance of foam is high, causes ground construction pressure high, and for effectively reducing string friction, coal bed fracturing adopts light sleeve pipe injection mode conventionally.Foam fracturing construction has 3 kinds of Construction Control: constant interior phase, constant foam quality and constant shaft bottom total displacement.Foam solution adds after proppant, in foam solution, foreign minister is still liquid phase, inside become mutually proppant and gas phase, from constructing operation is convenient, consider, adopt the control mode of constant interior phase and constant foam quality, comparatively difficult in operation, the displacement variation of nitrogen pump truck gear is difficult to reach the changing value of designing requirement, therefore adopts constant shaft bottom total displacement mode to construct.
Nitrogen can produce huge energy when fracturing fluid recovery (backflow), for the discharge opeing that can drive a well in time after guaranteeing to press, and should discharge opeing work adequate preparation is good before pressing crack construction.In open flow flow process, there is clearer and more definite requirement.Discharge opeing in time drives a well after pressure, after pressure break completes, control flow and carry out open flow, utilize 2 pipelines continuous blow-out release in turn, it is 20～60L/min that the open flow initial stage is controlled open flow flow, until well head pressure, reduce, increase gradually open flow flow after closing up of cracks, during open flow at any time observation well mouth pressure and discharge liquid containing sand situation; Fracturing fluid returns row by nitrogen energy, completes whole fracturing process; After fracturing reform completes, be lowered to numerically controlled reciprocating submersible pump to horizontal segment, control progressively depressurization desorption gas production of liquid level draining.
Flowback effect of the present invention is good.Show two aspects: 1, because foam density is low, well liquid column pressure is low, the back pressure that reservoir is produced also reduces greatly, is conducive to fracturing fluid and discharges pit shaft; 2, in flow process, in foam, gas expands, and can produce certain energy, accelerates the of the fracturing fluid row of returning.
Be understandable that, above about specific descriptions of the present invention, only for being described, the present invention is not limited to the described technical scheme of the embodiment of the present invention, those of ordinary skill in the art is to be understood that, still can modify or be equal to replacement the present invention, to reach identical technique effect; As long as meet, use needs, all within protection scope of the present invention.
Claims (1)
1. a coal bed gas horizontal well nitrogen foam pressure break production technique, is characterized in that: this technical step is as follows: coal bed gas horizontal well adopts three to end well, horizontal segment well cementation, that is: one of horizontal hole spud in top layer leakiness stratum, lower surface pipe sealing earth's surface; Two spud in to coal seam, are lowered to sleeve pipe sealing coal seam section with overlying strata; Three horizontal holes that spud in, casing cementing; When carrying out nitrogen foam pressure break, by two groups of device combinations, undertaken, be responsible for infusion fracturing fluid and proppant for one group, another group infusion nitrogen, converges at the high pressure line of well head front end, by fracture well head, enters pit shaft; Ground nitrogen is stored in tank with liquid state, by liquid nitrogen pump vehicle, nitrogen is squeezed into high pressure pipe joint and fracturing fluid is mixed in well during pressing crack construction, and high-pressure pump and evaporimeter by pump truck have just formed foam on ground; After pressure break completes, control flow and carry out open flow, utilize 2 pipelines continuous blow-out release in turn, it is 20～60L/min that the open flow initial stage is controlled open flow flow, until well head pressure, reduce, increase gradually open flow flow after closing up of cracks, during open flow at any time observation well mouth pressure and discharge liquid containing sand situation; Fracturing fluid returns row by nitrogen energy, completes whole fracturing process; After fracturing reform completes, be lowered to numerically controlled reciprocating submersible pump to horizontal segment, control progressively depressurization desorption gas production of liquid level draining.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201310615719.1A CN103590801A (en) | 2013-11-26 | 2013-11-26 | Coal bed methane horizontal well nitrogen foam fracturing mining technology |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310615719.1A CN103590801A (en) | 2013-11-26 | 2013-11-26 | Coal bed methane horizontal well nitrogen foam fracturing mining technology |
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| CN103590801A true CN103590801A (en) | 2014-02-19 |
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Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104389575A (en) * | 2014-11-18 | 2015-03-04 | 河南方舟新能源股份有限公司 | Coalbed methane well fracturing pure-nitrogen blockage-removing method for low-pressure low-permeability reservoir |
| CN104405359A (en) * | 2014-11-18 | 2015-03-11 | 河南理工大学 | Method and equipment for reducing pollution through nitrogen foam fracturing of coal-bed gas well of low-pressure and low-permeability reservoir |
| CN104481462A (en) * | 2014-11-18 | 2015-04-01 | 山西潞安环保能源开发股份有限公司 | Coal-bed gas aging well production capacity increasing method |
| CN104481493A (en) * | 2014-11-18 | 2015-04-01 | 河南理工大学 | Active water-nitrogen accompanied injection composite fracturing method for permeability enhancement of coal-bed gas well |
| CN104481490A (en) * | 2014-11-18 | 2015-04-01 | 河南方舟新能源股份有限公司 | Coal-bed gas well nitrogen foam fracturing fluid system |
| CN104533374A (en) * | 2014-11-18 | 2015-04-22 | 河南理工大学 | Active water-nitrogen injection combination fracturing fast flow-back production increase method for coal-bed gas well |
| CN104563999A (en) * | 2014-11-18 | 2015-04-29 | 山西潞安环保能源开发股份有限公司 | Nitrogen foam fracturing method of coal-bed gas well of low-pressure low-permeability reservoir |
| CN104564000A (en) * | 2014-11-18 | 2015-04-29 | 河南方舟新能源股份有限公司 | Coal-bed gas well active water-nitrogen foam compound fracturing yield increase method |
| CN104612648A (en) * | 2014-11-18 | 2015-05-13 | 河南理工大学 | Method and device for active water-nitrogen foam fracturing of low-pressure and low permeability coal bed gas well |
| CN104612645A (en) * | 2014-11-26 | 2015-05-13 | 山西潞安环保能源开发股份有限公司 | Method for nitrogen fracturing and yield increasing of low-pressure coal-bed gas well |
| CN105715245A (en) * | 2014-12-05 | 2016-06-29 | 中国石油天然气股份有限公司 | Nitrogen saturation hydraulic fracturing process for low-permeability low-pressure coal bed gas reservoir |
| CN108756870A (en) * | 2018-05-30 | 2018-11-06 | 中联煤层气有限责任公司 | A kind of fracturing fluid in the coalbed methane injury performance and Injury Mechanism analysis method |
| CN109057795A (en) * | 2018-08-29 | 2018-12-21 | 山西晋城无烟煤矿业集团有限责任公司 | It is a kind of to cross goaf coal bed gas ground drilling method |
| CN112593911A (en) * | 2020-12-14 | 2021-04-02 | 山西晋城无烟煤矿业集团有限责任公司 | Coal mining and diameter expanding method by sectional power of horizontal well on coal mine ground |
| CN113417619A (en) * | 2021-07-15 | 2021-09-21 | 中国煤炭地质总局勘查研究总院 | Unconventional volume fracturing device for reservoir transformation |
| CN114718513A (en) * | 2021-01-05 | 2022-07-08 | 中国石油天然气股份有限公司 | Method and device for estimating gas production rate of coal bed gas |
| US11559711B2 (en) | 2017-03-01 | 2023-01-24 | China Petroleum & Chemical Corporation | Foam producing method, fire extinguishing method, and appliance for foam extinguishing |
| CN119466702A (en) * | 2024-11-14 | 2025-02-18 | 太原理工大学 | Enhanced displacement yield increasing method for reservoir with cooperation of foam fracturing and gas injection |
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Cited By (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104389575A (en) * | 2014-11-18 | 2015-03-04 | 河南方舟新能源股份有限公司 | Coalbed methane well fracturing pure-nitrogen blockage-removing method for low-pressure low-permeability reservoir |
| CN104405359A (en) * | 2014-11-18 | 2015-03-11 | 河南理工大学 | Method and equipment for reducing pollution through nitrogen foam fracturing of coal-bed gas well of low-pressure and low-permeability reservoir |
| CN104481462A (en) * | 2014-11-18 | 2015-04-01 | 山西潞安环保能源开发股份有限公司 | Coal-bed gas aging well production capacity increasing method |
| CN104481493A (en) * | 2014-11-18 | 2015-04-01 | 河南理工大学 | Active water-nitrogen accompanied injection composite fracturing method for permeability enhancement of coal-bed gas well |
| CN104481490A (en) * | 2014-11-18 | 2015-04-01 | 河南方舟新能源股份有限公司 | Coal-bed gas well nitrogen foam fracturing fluid system |
| CN104533374A (en) * | 2014-11-18 | 2015-04-22 | 河南理工大学 | Active water-nitrogen injection combination fracturing fast flow-back production increase method for coal-bed gas well |
| CN104563999A (en) * | 2014-11-18 | 2015-04-29 | 山西潞安环保能源开发股份有限公司 | Nitrogen foam fracturing method of coal-bed gas well of low-pressure low-permeability reservoir |
| CN104564000A (en) * | 2014-11-18 | 2015-04-29 | 河南方舟新能源股份有限公司 | Coal-bed gas well active water-nitrogen foam compound fracturing yield increase method |
| CN104612648A (en) * | 2014-11-18 | 2015-05-13 | 河南理工大学 | Method and device for active water-nitrogen foam fracturing of low-pressure and low permeability coal bed gas well |
| CN104612645A (en) * | 2014-11-26 | 2015-05-13 | 山西潞安环保能源开发股份有限公司 | Method for nitrogen fracturing and yield increasing of low-pressure coal-bed gas well |
| CN105715245A (en) * | 2014-12-05 | 2016-06-29 | 中国石油天然气股份有限公司 | Nitrogen saturation hydraulic fracturing process for low-permeability low-pressure coal bed gas reservoir |
| US11559711B2 (en) | 2017-03-01 | 2023-01-24 | China Petroleum & Chemical Corporation | Foam producing method, fire extinguishing method, and appliance for foam extinguishing |
| US11980785B2 (en) | 2017-03-01 | 2024-05-14 | China Petroleum & Chemical Corporation | Foam producing method, fire extinguishing method, and appliance for foam extinguishing |
| CN108756870A (en) * | 2018-05-30 | 2018-11-06 | 中联煤层气有限责任公司 | A kind of fracturing fluid in the coalbed methane injury performance and Injury Mechanism analysis method |
| CN109057795A (en) * | 2018-08-29 | 2018-12-21 | 山西晋城无烟煤矿业集团有限责任公司 | It is a kind of to cross goaf coal bed gas ground drilling method |
| CN112593911A (en) * | 2020-12-14 | 2021-04-02 | 山西晋城无烟煤矿业集团有限责任公司 | Coal mining and diameter expanding method by sectional power of horizontal well on coal mine ground |
| CN112593911B (en) * | 2020-12-14 | 2022-05-17 | 山西晋城无烟煤矿业集团有限责任公司 | Coal mining and diameter expanding method by sectional power of horizontal well on coal mine ground |
| CN114718513A (en) * | 2021-01-05 | 2022-07-08 | 中国石油天然气股份有限公司 | Method and device for estimating gas production rate of coal bed gas |
| CN114718513B (en) * | 2021-01-05 | 2024-05-28 | 中国石油天然气股份有限公司 | Method and device for estimating gas yield of coalbed methane |
| CN113417619A (en) * | 2021-07-15 | 2021-09-21 | 中国煤炭地质总局勘查研究总院 | Unconventional volume fracturing device for reservoir transformation |
| CN113417619B (en) * | 2021-07-15 | 2023-01-31 | 中国煤炭地质总局勘查研究总院 | A volume fracturing device for unconventional reservoir stimulation |
| CN119466702A (en) * | 2024-11-14 | 2025-02-18 | 太原理工大学 | Enhanced displacement yield increasing method for reservoir with cooperation of foam fracturing and gas injection |
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Application publication date: 20140219 |