CN104533374A - Active water-nitrogen injection combination fracturing fast flow-back production increase method for coal-bed gas well - Google Patents
Active water-nitrogen injection combination fracturing fast flow-back production increase method for coal-bed gas well Download PDFInfo
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- CN104533374A CN104533374A CN201410663653.8A CN201410663653A CN104533374A CN 104533374 A CN104533374 A CN 104533374A CN 201410663653 A CN201410663653 A CN 201410663653A CN 104533374 A CN104533374 A CN 104533374A
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- coal
- fracturing
- active water
- bed gas
- gas well
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
- E21B43/267—Methods for stimulating production by forming crevices or fractures reinforcing fractures by propping
Abstract
The invention relates to the technical field of coal-bed gas exploration and development, in particular to an active water-nitrogen injection combination fracturing fast flow-back production increase method for a coal-bed gas well. The active water-nitrogen injection combination fracturing fast flow-back production increase method for the coal-bed gas well includes steps that using a liquid nitrogen pump truck to fill nitrogen when performing low-pressure low-permeability coal reservoir fracturing improvement, using a hydraulic fracturing truck to fill active water, and immediately opening flow to flow back after ending fracturing. The active water-nitrogen injection combination fracturing fast flow-back production increase method for the coal-bed gas well solves the problems of low even zero flow-back rate of flow opening, large pollution to the coal reservoir and low permeability after the active water fracturing improvement for the low-permeability coal reservoir of the coal-bed gas well. The active water-nitrogen injection combination fracturing fast flow-back production increase method for the coal-bed gas well can realize 80% flow-back rate, the pollution to the coal reservoir is small, and meanwhile, the nitrogen is capable of lowering the partial pressure of methane and improving the permeability of the oil reservoir and good for quickly desorbing the gas of the coal-bed gas well and improving the gas output.
Description
Technical field
The present invention relates to a kind of CBM exploration and development technical field, the particularly a kind of coal bed gas well active water-nitrogen companion note composite fracturing row's of returning method for increasing fast.
Background technology
CHINESE COAL reservoir major part has the saturating feature of low pressure and low permeability, and when carrying out reservoir reconstruction, the liquid of press-in reservoir must be so many that to return discharge fast as far as possible, otherwise can pollute reservoir, reduce permeability.Domestic general utilization active water fracturing technique, there is above problem equally, filter loss is larger, the row of returning leads low, reservoir pollution is larger, and coal bed gas well effect of increasing production is undesirable, and this is also the general not high major reason of current low pressure and low permeability saturating coal seam reservoirs Production of Coal-bed Gas Wells.
Summary of the invention
The object of the present invention is to provide a kind of coal bed gas well active water-nitrogen companion note composite fracturing row's of returning method for increasing fast.
For achieving the above object, the present invention adopts following technical scheme: coal bed gas well fracturing reform adopts three phases, first stage uses liquid nitrogen pump vehicle nitrogen injection, injection terminates rear beginning second stage, fracturing car is used to inject active water, pressure break terminates the rear beginning phase III, and the open flow that drives a well returns row.
Beneficial effect of the present invention is:
After this technology solves hyposmosis coal seam reservoirs coal bed gas well active water fracturing reform, open flow returns row and leads low, the not even row of returning, and pollutes comparatively large, make the problem of permeability reduction to coal seam reservoirs.This technology can realize the row of returning and lead 80%, pollutes little to coal seam reservoirs, and nitrogen can reduce methane partial pressure and improve reservoir permeability simultaneously, is beneficial to the raising of coal bed gas well gas fast desorption and gas production.
Accompanying drawing explanation
Fig. 1 is equipment mounting structure schematic diagram of the present invention.
Detailed description of the invention
Below in conjunction with embodiment, describe the present invention in detail.
A kind of coal bed gas well active water-nitrogen companion note composite fracturing row's of returning method for increasing fast, is characterized in that, comprise the following steps:
A (), by pressure break design scale, first configures the liquid measure of active water, and be configured in strict accordance with active water proportioning and quality requirement;
B () coal bed gas well well head, command car, fracturing car, fracturing blender truck and liquid nitrogen pump vehicle connect;
C () requires to carry out pressure testing according to FRACTURING DESIGN, ensure that high pressure pipe joint does not sting leakage;
D () liquid nitrogen pump vehicle requires to carry out infusion nitrogen with FRACTURING DESIGN, nitrogen discharge temperature can not lower than 15 DEG C;
E () nitrogen infusion terminates after, require infusion active water and proppant with FRACTURING DESIGN;
Will return row by open flow immediately f () pressure break terminates after, before the closing up of cracks of coal seam, open flow speed is large as much as possible, but will prevent proppant band coal output layer, can open flow fast after closing up of cracks.
Claims (1)
1. the coal bed gas well active water-nitrogen companion note composite fracturing row's of returning method for increasing fast, is characterized in that, comprise the following steps:
A (), by pressure break design scale, first configures the liquid measure of active water, and be configured in strict accordance with active water proportioning and quality requirement;
B () coal bed gas well well head, command car, fracturing car, fracturing blender truck and liquid nitrogen pump vehicle connect;
C () requires to carry out pressure testing according to FRACTURING DESIGN, ensure that high pressure pipe joint does not sting leakage;
D () liquid nitrogen pump vehicle requires to carry out infusion nitrogen with FRACTURING DESIGN, nitrogen discharge temperature can not lower than 15 DEG C;
E () nitrogen infusion terminates after, require infusion active water and proppant with FRACTURING DESIGN;
Will return row by open flow immediately f () pressure break terminates after, before the closing up of cracks of coal seam, open flow speed is large as much as possible, but will prevent proppant band coal output layer, can open flow fast after closing up of cracks.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410663653.8A CN104533374A (en) | 2014-11-18 | 2014-11-18 | Active water-nitrogen injection combination fracturing fast flow-back production increase method for coal-bed gas well |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410663653.8A CN104533374A (en) | 2014-11-18 | 2014-11-18 | Active water-nitrogen injection combination fracturing fast flow-back production increase method for coal-bed gas well |
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| CN104533374A true CN104533374A (en) | 2015-04-22 |
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| CN201410663653.8A Pending CN104533374A (en) | 2014-11-18 | 2014-11-18 | Active water-nitrogen injection combination fracturing fast flow-back production increase method for coal-bed gas well |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104963660A (en) * | 2015-07-17 | 2015-10-07 | 煤炭科学技术研究院有限公司 | Liquid nitrogen freeze-thawing cracking coal-bed permeability-increasing coal-bed gas mining method |
| CN104963674A (en) * | 2015-07-17 | 2015-10-07 | 煤炭科学技术研究院有限公司 | Low permeability coal bed liquid nitrogen freeze thawing cracking permeability increasing method |
| CN105134284A (en) * | 2015-08-03 | 2015-12-09 | 中国矿业大学 | Gas extraction method based on horizontal orientation boring liquid nitrogen cycle freeze-thaw anti-reflection |
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| CN102094612A (en) * | 2010-12-21 | 2011-06-15 | 山西晋城无烟煤矿业集团有限责任公司 | Active water fracturing technology of coal-bed gas well |
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| CN103590801A (en) * | 2013-11-26 | 2014-02-19 | 中国石油集团长城钻探工程有限公司 | Coal bed methane horizontal well nitrogen foam fracturing mining technology |
| CN103726819A (en) * | 2013-12-27 | 2014-04-16 | 中国石油大学(华东) | Method of low-temperature gas-assisted coalbed methane fracturing technology |
| CN103924955A (en) * | 2014-04-21 | 2014-07-16 | 陕西延长石油(集团)有限责任公司研究院 | Shale gas well CO2 and slickwater mixing fracturing technology |
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2014
- 2014-11-18 CN CN201410663653.8A patent/CN104533374A/en active Pending
Patent Citations (5)
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| CN102094612A (en) * | 2010-12-21 | 2011-06-15 | 山西晋城无烟煤矿业集团有限责任公司 | Active water fracturing technology of coal-bed gas well |
| CN102168544A (en) * | 2011-03-28 | 2011-08-31 | 河南理工大学 | Method for surface modification and transmission increase of coal reservoirs by using chlorine dioxide |
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Non-Patent Citations (1)
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| 温庆志等: "《压裂酸化新技术与污染控制》", 31 October 2009 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104963660A (en) * | 2015-07-17 | 2015-10-07 | 煤炭科学技术研究院有限公司 | Liquid nitrogen freeze-thawing cracking coal-bed permeability-increasing coal-bed gas mining method |
| CN104963674A (en) * | 2015-07-17 | 2015-10-07 | 煤炭科学技术研究院有限公司 | Low permeability coal bed liquid nitrogen freeze thawing cracking permeability increasing method |
| CN104963660B (en) * | 2015-07-17 | 2017-10-24 | 煤炭科学技术研究院有限公司 | The coal bed methane exploring method that a kind of frozen-thawed cracking coal seam is anti-reflection |
| CN104963674B (en) * | 2015-07-17 | 2018-03-02 | 煤炭科学技术研究院有限公司 | Hypotonic coal seam frozen-thawed cracking anti-reflection method |
| CN105134284A (en) * | 2015-08-03 | 2015-12-09 | 中国矿业大学 | Gas extraction method based on horizontal orientation boring liquid nitrogen cycle freeze-thaw anti-reflection |
| CN105134284B (en) * | 2015-08-03 | 2017-05-31 | 中国矿业大学 | One kind is based on horizontal orientation drilling liquid nitrogen circulating freezing resistance anti-reflection mash gas extraction method |
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Application publication date: 20150422 |