CN104594868A - Multi-point control hydraulic fracturing, permeability-increasing and outburst-eliminating method - Google Patents
Multi-point control hydraulic fracturing, permeability-increasing and outburst-eliminating method Download PDFInfo
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- CN104594868A CN104594868A CN201510045815.6A CN201510045815A CN104594868A CN 104594868 A CN104594868 A CN 104594868A CN 201510045815 A CN201510045815 A CN 201510045815A CN 104594868 A CN104594868 A CN 104594868A
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- 238000000034 method Methods 0.000 title claims abstract description 22
- 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 37
- 238000007789 sealing Methods 0.000 claims abstract description 13
- 230000000694 effects Effects 0.000 claims description 14
- 230000008030 elimination Effects 0.000 claims description 10
- 238000003379 elimination reaction Methods 0.000 claims description 10
- 230000035699 permeability Effects 0.000 claims description 9
- 238000005553 drilling Methods 0.000 claims description 7
- 230000007423 decrease Effects 0.000 claims description 4
- 238000012544 monitoring process Methods 0.000 claims description 4
- 238000010276 construction Methods 0.000 claims description 3
- 238000001802 infusion 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
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000002347 injection Methods 0.000 abstract 3
- 239000007924 injection Substances 0.000 abstract 3
- 238000005516 engineering process Methods 0.000 description 5
- 238000004458 analytical method Methods 0.000 description 3
- 208000037656 Respiratory Sounds Diseases 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005065 mining Methods 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 239000012141 concentrate Substances 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
- 239000002699 waste material Substances 0.000 description 1
Classifications
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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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- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
- Examining Or Testing Airtightness (AREA)
Abstract
The invention discloses a multi-point control hydraulic fracturing, permeability-increasing and outburst-eliminating method. The method comprises the following steps: forming a group of hydraulic fracturing holes between every two rows of extraction holes, wherein the extraction holes are taken as control holes, and are uniformly formed around the hydraulic fracturing holes; effectively sealing the hydraulic fracturing holes and the control holes respectively; after hole sealing, injecting water into the hydraulic fracturing holes through a water injection pump to perform fracturing; observing the water pressure change of the water injection pump; when the pressure drops suddenly or water comes out from the control holes, closing a pressure relief valve and ending a fracturing procedure; after the end of fracturing, connecting an extraction pipeline to perform extraction. The method has the beneficial effects that the permeability-increasing direction of a coal bed is controlled in an oriented way during hydraulic fracturing of a low-permeability coal bed, the pressure relief range of the coal bed is effectively expanded, the equipment requirement on the hydraulic fracturing water injection pump is lowered, and the aim of rapidly eliminating outburst is fulfilled by effectively using extraction drill holes of the coal bed.
Description
Technical field
The invention belongs to anti-reflection quick yield-increasing technology field, coal seam, be specifically related to a kind of multiparty control hydraulic fracturing anti-reflection outburst elimination method.
Background technology
At present, coal seam hydraulic fracture is that water under high pressure is injected coal seam by water injecting pump, forms man-made fracture or expands existing crack, coal body destroyed and produces displacement, increasing gas permeability of coal seam, thus obtain good gas pumping effect in coal seam.But what current hydraulic fracturing method mainly adopted is single hole pressure break, and anti-reflection direction is uncertain, easily cause stress to concentrate, need fracturing pump hydraulic pressure high, equipment requirement is high simultaneously, and fully effectively cannot utilize the extraction hole in coal seam, causes the waste in engineering.
In China, coal and gas prominent is Gas Disaster accident important in coal production, carrying out extraction to coal-bed gas is effective measures, along with the increase of coal mining depth, gas permeability of coal seam is low becomes the key factor affecting gas drainage under suction efficiency, in single low air permeability coal seam, adopt fracturing can effectively expand pressure release scope, increase gas permeability of coal seam, but the direction that traditional fracturing is propagated due to crack cannot be controlled, cause pressure release uneven, easily cause stress raisers.Existing directed hydraulic fracturing technology hydraulic perforating assist fracturing technique technique, operation more loaded down with trivial details, particularly also do not solved well to hole deslagging for lower.
Summary of the invention
The present invention is in order to solve weak point of the prior art, coal seam stress raisers are caused after implementing fracturing measure, reach the fracturing effect of overall release, effectively utilize coal bed gas drainage to hole simultaneously, reduce engineering quantity, the invention provides a kind of multiparty control hydraulic fracturing anti-reflection outburst elimination method, the method effectively can improve problem of stress concentration after pressure break, forms the larger anti-reflection scope of pressure release.
For solving the problems of the technologies described above, the present invention adopts following technical scheme: multiparty control hydraulic fracturing anti-reflection outburst elimination method, comprises the following steps,
1) arrange drainage holes in coal seam at interval of certain distance construction number by the mode of layer-through drilling at floor roadway, in intermediate arrangement one group of fracturing hole of every two row's drainage holes, drainage holes is control hole, and control hole uniform ring is around in fracturing hole surrounding;
2) use self-sealing hole packer to put into fracturing hole and control hole, carry out effective sealing of hole;
3) in fracturing hole, inject water under high pressure with high-pressure hydraulic pump, observe the change of water filling pump pressure, and make a record, adopt dynamical pressure water infusion, progressively pressurize, observe pressure stability;
4) persistent pressure 30-60min, after coal mass fracture, water-aspirator pressure decline suddenly, when pressure durations reaches 30% to fall, or find that control hole has water outlet phenomenon, stop pressure break, close relief valve, pressure break operation terminates;
5) numerical value of the forward and backward mash gas extraction concentration of pressure break and extraction scale all contrasted to each fracturing hole and calculated, judging fracturing effect;
6) continuous extraction tracking and monitoring 10d after pressure break, investigate its extracting result.
For soft low air permeability coal seam, adopt the mode of layer-through drilling, fetch water from floor roadway to coal seam 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 the geologic data at scene, simulating fracturing from breaking to the hydraulic pressure required for fracture propagation, choosing water filling high-pressure hydraulic pump in conjunction with scene.
According to the forward and backward mash gas extraction concentration of pressure break in step 5), the change of extraction scale judges the practice effect of multiparty control fracturing.
Adopt technique scheme, the present invention adopts following principle: in every two row drainage holes intermediate arrangement one group of fracturing hole, drainage holes is as control hole, it is arranged in fracturing hole surrounding equably, carries out effective sealing of hole respectively to fracturing hole and control hole, carries out pressure break after sealing of hole with water injecting pump to water filling in fracturing hole, observe the variation in water pressure of water injecting pump, when pressure declines suddenly or control hole has a water outlet phenomenon, close relief valve, fracturing procedures terminates.Pressure break terminates rear connection extraction pipeline and carries out extraction.In fracturing process, due to the auxiliary scope of freedom effect of drainage holes, the crackle that fracturing hole produces is had to guiding and accelerates the effect of expansion, and induces the control hole future development of crack from fracturing hole to surrounding, reach the object of even pressure break.
The invention has the beneficial effects as follows, when carrying out fracturing to low air permeability coal seam, realizing anti-reflection direction, oriented control coal seam, effectively expand coal seam pressure release scope, reduce the equipment requirement to fracturing water injecting pump, effectively utilize drainage from coal seam to hole, realize the object of rapid outburst elimination.
Accompanying drawing explanation
Fig. 1 is that the facade of the outer section fracturing hole of floor roadway and control hole in the present invention arranges schematic diagram;
Fig. 2 is the 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 numeral 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.
Detailed description of the invention
Multiparty control hydraulic fracturing anti-reflection outburst elimination method of the present invention, comprises the following steps:
1) arrange drainage holes in coal seam at interval of certain distance construction number by the mode of layer-through drilling at floor roadway, in intermediate arrangement one group of fracturing hole of every two row's drainage holes, drainage holes is control hole, and control hole uniform ring is around in fracturing hole surrounding;
2) use self-sealing hole packer to put into fracturing hole and control hole, carry out effective sealing of hole;
3) in fracturing hole, inject water under high pressure with high-pressure hydraulic pump, observe the change of water filling pump pressure, and make a record, adopt dynamical pressure water infusion, progressively pressurize, observe pressure stability;
4) persistent pressure 30-60min, after coal mass fracture, water-aspirator pressure decline suddenly, when pressure durations reaches 30% to fall, or find that control hole has water outlet phenomenon, stop pressure break, close relief valve, pressure break operation terminates;
5) numerical value of the forward and backward mash gas extraction concentration of pressure break and extraction scale all contrasted to each fracturing hole and calculated, judging fracturing effect;
6) continuous extraction tracking and monitoring 10d after pressure break, investigate its extracting result.
For soft low air permeability coal seam, adopt the mode of layer-through drilling, fetch water from floor roadway to coal seam 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 the geologic data at scene, simulating fracturing from breaking to the hydraulic pressure required for fracture propagation, choosing water filling high-pressure hydraulic pump in conjunction with scene.
According to the forward and backward mash gas extraction concentration of pressure break in step 5), the change of extraction scale judges the practice effect of multiparty control fracturing.
The present invention is in every two row drainage holes intermediate arrangement one group of fracturing hole, drainage holes is as control hole, it is arranged in fracturing hole surrounding equably, respectively effective sealing of hole is carried out 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 a water outlet phenomenon, close relief valve, fracturing procedures terminates.Pressure break terminates rear connection extraction pipeline and carries out extraction.In fracturing process, due to the auxiliary scope of freedom effect of drainage holes, the crackle that fracturing hole produces is had to guiding and accelerates the effect of expansion, and induces the control hole future development of crack from fracturing hole to surrounding, reach the object of even pressure break.
Technical scheme of the present invention is adopted in low air permeability coal seam.The test of multiparty control hydraulic fracturing technology is adopted to be described for certain ore deposit below.
In the embodiment shown in Fig. 1 and Fig. 2, in the every two row drainage holes intermediate arrangement one group of fracturing hole 3 of the outer section of floor roadway 6, the object of pressure break is the extraction borehole in coal seam 4 is control hole 2, fracturing hole 3 diameter is 75mm, the aperture of control hole 2 is not less than 75mm, control hole 2 is evenly positioned at the surrounding in fracturing hole 3, carries out effective sealing of hole, inject water under high pressure afterwards with high-pressure hydraulic pump in fracturing hole 3 before water filling to control hole 2 and fracturing hole 3.Observe the hydraulic pressure registration on high-pressure hydraulic pump afterwards, when pressure decline suddenly or control hole 2 water outlet time, pressure break operation terminates.
As shown in Figure 3 and Figure 4, in figure, No. 1 hole and No. 2 holes are all control holes, verify the effect of multiparty control fracturing, according to the observation the forward and backward mash gas extraction concentration of pressure break, and extraction scale judges fracturing effect.After pressure, Continuous Tracking monitoring 10d, investigates its extracting result.Carry out sample analysis to drainage holes before pressure break, hole pumping and mining gas density is generally lower, maximum concentration 7%, and minimum is 4%, average out to 5%; Extraction scale is up to 0.007 m
3/ min, minimum scale is 0.001m
3/ min, average out to 0.004m
3/ min.To taking out pressure break hole, peephole sample analysis after pressure break.Extraction concentration in pressure break hole is up to 100%, and minimum is 75%, and average out to 87%, extraction scale is up to 0.186m
3/ min, minimum is 0.106m
3/ min, average out to 0.146m
3/ min.Control hole extraction concentration is up to 40%, and minimum is 25%, average out to 32%; Extraction scale is up to 0.1m
3/ min, minimum is 0.035m
3/ min, average out to 0.06m
3/ min.Pressure break hole mash gas extraction concentration is high, and flow is large, effective, secondly for affect control hole by pressure break.Pressure break hole mash gas extraction concentration is 3.5 times of control hole, is 17 before pressure break times; Pressure break hole mash gas extraction scale is 2.4 times of control hole hole, is 20 before pressure break times.Its extracting result is good, while elimination coal and gas prominent danger, brings very large economic interests.
Above embodiment is the unrestricted technical scheme of the present invention in order to explanation only, although with reference to above-described embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that: still can modify to the present invention or equivalent replacement, and not departing from any modification or partial replacement of the spirit and scope of the present invention, it all should be encompassed in the middle of right of the present invention.
Claims (3)
1. multiparty control hydraulic fracturing anti-reflection outburst elimination method, is characterized in that: comprise the following steps,
1) drainage holes is arranged in coal seam at interval of certain distance construction number by the mode of layer-through drilling at floor roadway, in intermediate arrangement one group of fracturing hole of every two row's drainage holes, drainage holes is control hole, has the auxiliary scope of freedom in drainage holes, and control hole uniform ring is around in fracturing hole surrounding;
2) use self-sealing hole packer to put into fracturing hole and control hole, carry out effective sealing of hole;
3) in fracturing hole, inject water under high pressure with high-pressure hydraulic pump, observe the change of water filling pump pressure, and make a record, adopt dynamical pressure water infusion, progressively pressurize, observe pressure stability;
4) persistent pressure 30-60min, after coal mass fracture, water-aspirator pressure decline suddenly, when pressure durations reaches 30% to fall, or find that control hole has water outlet phenomenon, stop pressure break, close relief valve, pressure break operation terminates;
5) numerical value of the forward and backward mash gas extraction concentration of pressure break and extraction scale all contrasted to each fracturing hole and calculated, judging fracturing effect;
6) continuous extraction tracking and monitoring 10d after pressure break, investigate its extracting result.
2. multiparty control hydraulic fracturing anti-reflection outburst elimination method according to claim 1, it is characterized in that: for soft low air permeability coal seam, adopt the mode of layer-through drilling, fetch water from floor roadway to coal seam 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 the geologic data at scene, simulating fracturing from breaking to the hydraulic pressure required for fracture propagation, choosing 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, is characterized in that: according to the forward and backward mash gas extraction concentration of pressure break in step 5), the change of extraction scale judges the practice effect of multiparty control fracturing.
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| CN201510045815.6A CN104594868B (en) | 2015-01-29 | 2015-01-29 | Multiparty control hydraulic fracturing anti-reflection outburst elimination method |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN105239984A (en) * | 2015-10-14 | 2016-01-13 | 重庆交通大学 | Method for controlling coal mine underground fracturing crack propagation |
| CN105673063A (en) * | 2016-01-06 | 2016-06-15 | 中国矿业大学 | Impact-disaster control method for large-dip-angle gas-containing thick coal seam |
| 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 |
| CN114673499A (en) * | 2022-03-18 | 2022-06-28 | 中煤地生态环境科技有限公司 | Method for preventing rock burst |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107503727B (en) * | 2017-10-16 | 2019-05-03 | 重庆大学 | It is a kind of that a layer hydraulic fracturing range investigation method is worn based on in-situ stress monitoring |
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2015
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Patent Citations (6)
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN105239984A (en) * | 2015-10-14 | 2016-01-13 | 重庆交通大学 | Method for controlling coal mine underground fracturing crack propagation |
| 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 |
| CN105673063A (en) * | 2016-01-06 | 2016-06-15 | 中国矿业大学 | Impact-disaster control method for large-dip-angle gas-containing thick coal seam |
| 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 |
| CN114673499A (en) * | 2022-03-18 | 2022-06-28 | 中煤地生态环境科技有限公司 | Method for preventing rock burst |
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