CN104594868B - Multiparty control hydraulic fracturing anti-reflection outburst elimination method - Google Patents
Multiparty control hydraulic fracturing anti-reflection outburst elimination method Download PDFInfo
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- CN104594868B CN104594868B CN201510045815.6A CN201510045815A CN104594868B CN 104594868 B CN104594868 B CN 104594868B CN 201510045815 A CN201510045815 A CN 201510045815A CN 104594868 B CN104594868 B CN 104594868B
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- 238000000034 method Methods 0.000 title claims abstract description 20
- 230000008030 elimination Effects 0.000 title claims abstract description 10
- 238000003379 elimination reaction Methods 0.000 title claims abstract description 10
- 239000003245 coal Substances 0.000 claims abstract description 40
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 40
- 238000000605 extraction Methods 0.000 claims abstract description 34
- 238000007789 sealing Methods 0.000 claims abstract description 13
- 230000000694 effects Effects 0.000 claims description 14
- 238000005553 drilling Methods 0.000 claims description 7
- 230000007423 decrease Effects 0.000 claims description 4
- 238000010276 construction Methods 0.000 claims description 3
- 238000001802 infusion Methods 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
- 230000002085 persistent effect Effects 0.000 claims description 3
- 239000011148 porous material Substances 0.000 claims description 3
- 238000004088 simulation Methods 0.000 claims description 3
- 230000035699 permeability Effects 0.000 abstract description 9
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 description 3
- 238000005065 mining Methods 0.000 description 3
- 208000037656 Respiratory Sounds Diseases 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 230000008033 biological extinction Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005206 flow analysis Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
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- General Life Sciences & Earth Sciences (AREA)
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Abstract
Multiparty control hydraulic fracturing anti-reflection outburst elimination method, comprises the following steps：In every two one group of fracturing hole of row's drainage holes intermediate arrangement, drainage holes are as control hole, it is equably arranged in fracturing hole surrounding, effective sealing of hole is carried out respectively to fracturing hole and control hole, carry out pressure break with water injecting pump to water filling in fracturing hole after sealing of hole, observe the variation in water pressure of water injecting pump, when pressure declines suddenly or control hole has water outlet phenomenon, close relief valve, fracturing procedures terminate.Pressure break connects extraction pipeline after terminating and carries out extraction.The invention has the beneficial effects as follows, when fracturing is carried out to low air permeability coal seam, realize the anti-reflection direction in oriented control coal seam, effectively expand coal seam pressure release scope, reduce the equipment requirements to fracturing water injecting pump, effectively utilizes drainage from coal seam is holed, and realizes the purpose of rapid outburst elimination.
Description
Technical field
The invention belongs to the anti-reflection quick yield-increasing technology field in coal seam is and in particular to a kind of multiparty control hydraulic fracturing anti-reflection disappears
Burst method.
Background technology
At present, coal seam hydraulic fracture be by water injecting pump by water under high pressure inject coal seam in, in coal seam formed man-made fracture or
Expanding existing crack, so that coal body is destroyed and produce displacement, increasing gas permeability of coal seam, thus obtaining good gas pumping effect.
But, current hydraulic fracturing method mainly uses single hole pressure break, and anti-reflection direction does not know, and easily causes stress concentration, with
When need fracturing pump hydraulic pressure high, equipment requirements are high, and cannot extraction hole fully in effectively utilizes coal seam, cause the wave in engineering
Take.
In China, coal and gas prominent is important Gas Disaster accident in coal production, carries out extraction to coal-bed gas
It is effective measures, with the increase of coal mining depth, the low weight becoming impact gas drainage under suction efficiency of gas permeability of coal seam
Want factor, in single low air permeability coal seam, pressure release scope can effectively be expanded using fracturing, increase gas permeability of coal seam,
But traditional fracturing cannot be controlled due to the direction that crack is propagated, and causes pressure release uneven, local is easily caused to answer
Power is concentrated.Existing orientation hydraulic fracturing technology hydraulic perforating auxiliary fracturing technique technique, operation are comparatively laborious, especially for
Lower also do not solved well to hole deslagging.
Content of the invention
The present invention, in order to solve weak point of the prior art, causes coal seam in order to avoid after enforcement fracturing measure
Stress raisers, reach the fracturing effect of overall release, effectively utilize coal bed gas drainage to hole simultaneously, reduce engineering
Amount, the present invention provides a kind of multiparty control hydraulic fracturing anti-reflection outburst elimination method, and the method can be effectively improved stress concentration after pressure break
Problem, forms the larger anti-reflection scope of pressure release.
For solving above-mentioned technical problem, the present invention adopts the following technical scheme that：Multiparty control hydraulic fracturing anti-reflection extinction side
Method, comprises the following steps,
1）Arrange drainage holes in floor roadway in coal seam at interval of certain distance construction number by way of layer-through drilling,
One group of fracturing hole of intermediate arrangement of every two row's drainage holes, drainage holes are control hole, and control hole is uniformly surrounded on waterpower pressure
Ceasma surrounding；
2）Put into fracturing hole using self-sealing hole packer and control in the hole, carry out effective sealing of hole；
3）Inject water under high pressure with high-pressure hydraulic pump to fracturing in the hole, observe the change of water filling pump pressure, and make a record,
Using dynamical pressure water infusion, progressively pressurize, observe pressure stability；
4）Persistent pressure 30-60min, after coal mass fracture, water-aspirator pressure decline suddenly, pressure lasts till fall
When reaching 30%, or find that control hole has water outlet phenomenon, stop pressure break, close relief valve, pressure break operation terminates；
5）Each fracturing hole is all contrasted with the numerical value in addition of pressure break forward and backward mash gas extraction concentration and extraction scale
Calculate, judge fracturing effect；
6）After pressure break, continuous extraction tracking and monitoring 10d, investigate its extracting result.
For soft low air permeability coal seam, by the way of layer-through drilling, fetch water to coal seam from floor roadway and defeat ceasma
And drainage holes, the arrangement of fracturing hole and drainage holes, arrange number, pore size, determine according to numerical simulation result；
According to live geologic data, simulate hydraulic pressure required for rupture to crack extends for the fracturing, choose note in conjunction with scene
Water high-pressure hydraulic pump.
Step 5）Middle according to pressure break forward and backward mash gas extraction concentration, the change of extraction scale is judging multiparty control waterpower pressure
The practice effect splitting.
Using technique scheme, the present invention adopts following principle：In every two one group of waterpower pressure of row's drainage holes intermediate arrangement
Ceasma, as control hole, it is equably arranged in fracturing hole surrounding to drainage holes, and fracturing hole and control hole are entered respectively
The effective sealing of hole of row, carries out pressure break with water injecting pump to water filling in fracturing hole after sealing of hole, observes the variation in water pressure of water injecting pump, when
When pressure declines suddenly or control hole has water outlet phenomenon, close relief valve, fracturing procedures terminate.Pressure break connects extraction after terminating
Pipeline carries out extraction.In fracturing process, due to the auxiliary scope of freedom effect of drainage holes, the crackle tool that fracturing hole is produced
Play the role of to guide and accelerate extension, and induce crack to develop to the control hole direction of surrounding from fracturing hole, reach uniformly
The purpose of pressure break.
The invention has the beneficial effects as follows, when fracturing is carried out to low air permeability coal seam, realize oriented control coal seam and increase
Direction thoroughly, effectively expands coal seam pressure release scope, reduces the equipment requirements to fracturing water injecting pump, effectively utilizes drainage from coal seam
Boring, realizes the purpose of rapid outburst elimination.
Brief description
Fig. 1 is the facade arrangement schematic diagram of the outer section fracturing hole of floor roadway and control hole in the present invention；
Fig. 2 is the horizontal layout schematic diagram of fracturing hole and control hole in coal seam in Fig. 1；
Fig. 3 is pressure break forward and backward drill mash gas concentration analysis figure；
Fig. 4 is pressure break forward and backward drilling gas flow analysis figure.
Reference in Fig. 1 and Fig. 2 is respectively：Crossheading under 1-, 2- control hole（Drainage holes）, 3- fracturing hole, 4-
Coal seam, 5- absolute altitude, 6- floor roadway.
Specific embodiment
The multiparty control hydraulic fracturing anti-reflection outburst elimination method of the present invention, comprises the following steps：
1）Arrange drainage holes in floor roadway in coal seam at interval of certain distance construction number by way of layer-through drilling,
One group of fracturing hole of intermediate arrangement of every two row's drainage holes, drainage holes are control hole, and control hole is uniformly surrounded on waterpower pressure
Ceasma surrounding；
2）Put into fracturing hole using self-sealing hole packer and control in the hole, carry out effective sealing of hole；
3）Inject water under high pressure with high-pressure hydraulic pump to fracturing in the hole, observe the change of water filling pump pressure, and make a record,
Using dynamical pressure water infusion, progressively pressurize, observe pressure stability；
4）Persistent pressure 30-60min, after coal mass fracture, water-aspirator pressure decline suddenly, pressure lasts till fall
When reaching 30%, or find that control hole has water outlet phenomenon, stop pressure break, close relief valve, pressure break operation terminates；
5）Each fracturing hole is all contrasted with the numerical value in addition of pressure break forward and backward mash gas extraction concentration and extraction scale
Calculate, judge fracturing effect；
6）After pressure break, continuous extraction tracking and monitoring 10d, investigate its extracting result.
For soft low air permeability coal seam, by the way of layer-through drilling, fetch water to coal seam from floor roadway and defeat ceasma
And drainage holes, the arrangement of fracturing hole and drainage holes, arrange number, pore size, determine according to numerical simulation result；
According to live geologic data, simulate hydraulic pressure required for rupture to crack extends for the fracturing, choose note in conjunction with scene
Water high-pressure hydraulic pump.
Step 5）Middle according to pressure break forward and backward mash gas extraction concentration, the change of extraction scale is judging multiparty control waterpower pressure
The practice effect splitting.
, in every two one group of fracturing hole of row's drainage holes intermediate arrangement, as control hole, it is equably for drainage holes for the present invention
Be arranged in fracturing hole surrounding, respectively effective sealing of hole carried out to fracturing hole and control hole, after sealing of hole use water injecting pump to
In fracturing hole, water filling carries out pressure break, observes the variation in water pressure of water injecting pump, and when pressure, decline or control hole have water outlet suddenly
During phenomenon, close relief valve, fracturing procedures terminate.Pressure break connects extraction pipeline after terminating and carries out extraction.In fracturing process, by
In the auxiliary scope of freedom effect of drainage holes, the effect that the crackle that fracturing hole is produced has guiding and accelerates extension, and lure
Lead crack to develop to the control hole direction of surrounding from fracturing hole, reach the purpose of uniform pressure break.
Technical scheme is adopted in low air permeability coal seam.Below with certain ore mining multiparty control fracturing skill
Illustrate as a example art test.
In embodiment shown in Fig. 1 and Fig. 2, in the every two one group of waterpower of row's drainage holes intermediate arrangement of the outer section of floor roadway 6
Pressure break hole 3, the object of pressure break is control hole 2 for the extraction borehole in coal seam 4, a diameter of 75mm in fracturing hole 3, control hole 2
Aperture be not less than 75mm, control hole 2 is uniformly located at the surrounding in fracturing hole 3, to control hole 2 and fracturing before water filling
Hole 3 carries out effective sealing of hole, injects water under high pressure with high-pressure hydraulic pump afterwards into fracturing hole 3.Afterwards on observation high-pressure hydraulic pump
Hydraulic pressure registration, when pressure declines suddenly or during control hole 2 water outlet, pressure break operation terminates.
As shown in Figure 3 and Figure 4, No. 1 hole of in figure and No. 2 holes are all control holes, and the effect of multiparty control fracturing is entered
Row checking, pressure break forward and backward mash gas extraction concentration according to the observation, extraction scale is judging fracturing effect.After pressure, continuous tracking is supervised
Survey 10d, investigate its extracting result.Before pressure break, drainage holes are sampled analyzing, generally ratio is relatively low, for hole pumping and mining gas density
High concentration 7%, minimum 4%, average out to 5%；Extraction scale is up to 0.007 m3/ min, minimum scale is 0.001m3/
Min, average out to 0.004m3/min.To taking out pressure break hole, peephole sample analysis after pressure break.Pressure break hole extraction concentration is up to
100%, minimum 75%, average out to 87%, extraction scale is up to 0.186m3/ min, minimum 0.106m3/ min, average out to
0.146m3/min.Control hole extraction concentration is up to 40%, minimum 25%, average out to 32%；Extraction scale is up to 0.1m3/
Min, minimum 0.035m3/ min, average out to 0.06m3/min.Pressure break hole mash gas extraction concentration is high, and flow is big, and effect is good, secondly
It is to be affected control hole by pressure break.Pressure break hole mash gas extraction concentration is 3.5 times of control hole, is 17 times before pressure break；Pressure break hole is taken out
Mash gas scale is 2.4 times of control hole hole, is 20 times before pressure break.Its extracting result is good, is eliminating coal and gas prominent
While dangerous, bring very big economic interests.
Above example is only in order to illustrative and not limiting technical scheme, although reference above-described embodiment is to this
Bright be described in detail, it will be understood by those within the art that：Still the present invention can be modified or wait
With replacing, any modification or partial replacement without departing from the spirit and scope of the present invention, it all should cover the power in the present invention
In the middle of sharp claimed range.
Claims (3)
1. multiparty control hydraulic fracturing anti-reflection outburst elimination method it is characterised in that：Comprise the following steps,
1）Arrange drainage holes in floor roadway in coal seam at interval of certain distance construction number by way of layer-through drilling, every two
One group of fracturing hole of intermediate arrangement of row's drainage holes, drainage holes are control hole, and extraction in the hole has the auxiliary scope of freedom, control
Hole is uniformly surrounded on fracturing hole surrounding；
2）Put into fracturing hole using self-sealing hole packer and control in the hole, carry out effective sealing of hole；
3）Inject water under high pressure with high-pressure hydraulic pump to fracturing in the hole, observe the change of water filling pump pressure, and make a record, adopt
Dynamical pressure water infusion, progressively pressurizes, and observes pressure stability；
4）Persistent pressure 30-60min, after coal mass fracture, water-aspirator pressure decline suddenly, pressure lasts till that fall reaches 30%
When, or find that control hole has water outlet phenomenon, stop pressure break, close relief valve, pressure break operation terminates；
5）The numerical value of pressure break forward and backward mash gas extraction concentration and extraction scale is all contrasted to each fracturing hole and is calculated,
Judge fracturing effect；
6）After pressure break, continuous extraction tracking and monitoring 10d, investigate its extracting result.
2. multiparty control hydraulic fracturing anti-reflection outburst elimination method according to claim 1 it is characterised in that：For soft low
Gas coal seam, by the way of layer-through drilling, fetches water to coal seam from floor roadway and defeats ceasma and drainage holes, fracturing hole and
The arrangement of drainage holes, arranges number, pore size, determines according to numerical simulation result；According to live geologic data, mould
Draw up hydraulic pressure required for rupture to crack extends for the fracturing, choose water filling high-pressure hydraulic pump in conjunction with scene.
3. multiparty control hydraulic fracturing anti-reflection outburst elimination method according to claim 1 and 2 it is characterised in that：Step 5）In
According to pressure break forward and backward mash gas extraction concentration, the change of the extraction scale practice effect to judge multiparty control fracturing.
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| CN107503727A (en) * | 2017-10-16 | 2017-12-22 | 重庆大学 | A kind of layer hydraulic fracturing scope of wearing based on in-situ stress monitoring investigates method |
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| CN105064969A (en) * | 2015-08-19 | 2015-11-18 | 山西鸿海科贸有限公司 | Fracturing method capable of preventing induction outburst |
| CN105239984B (en) * | 2015-10-14 | 2018-05-29 | 重庆交通大学 | A kind of coal mine underground fracturing crack extends control method |
| CN105673063B (en) * | 2016-01-06 | 2018-01-16 | 中国矿业大学 | A kind of high inclination-angle thick gassy coal seam impacts diaster prevention and control method |
| CN106640020A (en) * | 2016-11-24 | 2017-05-10 | 安徽理工大学 | Method for increasing air permeability of high-gassy low-air-permeability coal seam |
| CN107152303A (en) * | 2017-07-05 | 2017-09-12 | 安徽理工大学 | A kind of low ventilative high gas layer is by the method for the shielding efficient unloading pressure by blasting extraction in lane |
| CN114251080A (en) * | 2021-12-28 | 2022-03-29 | 中国矿业大学 | Controllable detonation pressure uniform pressure relief permeability increasing method and system |
| CN114673499B (en) * | 2022-03-18 | 2024-06-21 | 中煤地生态环境科技有限公司 | Method for preventing rock burst |
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| US3933205A (en) * | 1973-10-09 | 1976-01-20 | Othar Meade Kiel | Hydraulic fracturing process using reverse flow |
| CN102383773A (en) * | 2011-07-01 | 2012-03-21 | 河南省瓦斯治理研究院有限公司 | Method for exploiting coal bed gas by physical regional pressure relief |
| CN102383828B (en) * | 2011-07-08 | 2013-11-20 | 中国矿业大学 | Refection reducing and outburst eliminating method for deep-hole hydraulic fracture driving gas shallow hole extraction |
| CN102654049B (en) * | 2012-05-28 | 2015-04-29 | 中国矿业大学 | Porous linear control hydraulic fracturing method |
| CN102704905A (en) * | 2012-06-11 | 2012-10-03 | 煤炭科学研究总院沈阳研究院 | Segmental hydraulic fracturing coal seam pressure releasing device and method |
| CN103195466B (en) * | 2013-03-30 | 2015-08-19 | 重庆大学 | A kind of directed hydraulic pressure demolition improves the method for gas permeability of coal seam |
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