CN107100612B - Method for investigating underground hydraulic fracturing influence area - Google Patents
Method for investigating underground hydraulic fracturing influence area Download PDFInfo
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- CN107100612B CN107100612B CN201710248145.7A CN201710248145A CN107100612B CN 107100612 B CN107100612 B CN 107100612B CN 201710248145 A CN201710248145 A CN 201710248145A CN 107100612 B CN107100612 B CN 107100612B
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- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000012544 monitoring process Methods 0.000 claims abstract description 130
- 239000003245 coal Substances 0.000 claims abstract description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 22
- 230000000694 effects Effects 0.000 claims abstract description 13
- 238000011835 investigation Methods 0.000 claims abstract description 11
- 238000001514 detection method Methods 0.000 claims abstract description 8
- 239000013307 optical fiber Substances 0.000 claims description 4
- 239000003566 sealing material Substances 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 3
- 238000013480 data collection Methods 0.000 claims 1
- 238000005553 drilling Methods 0.000 description 6
- 238000000605 extraction Methods 0.000 description 6
- 238000005065 mining Methods 0.000 description 4
- 230000035699 permeability Effects 0.000 description 3
- 230000002265 prevention Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000737 periodic effect Effects 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000011435 rock Substances 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
- E21B47/00—Survey of boreholes or wells
- E21B47/06—Measuring temperature or pressure
- E21B47/07—Temperature
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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
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
- E21B43/2405—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection in association with fracturing or crevice forming processes
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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)
- Geophysics (AREA)
- Testing Or Calibration Of Command Recording Devices (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
Abstract
The invention discloses a method for inspecting an underground hydraulic fracturing influence area, which comprises the steps of constructing a first monitoring hole, a second monitoring hole, a third monitoring hole and a fourth monitoring hole on the same horizontal line at two ends of a fracturing hole in sequence, wherein the distance between the fracturing hole and the first monitoring hole is 8m, the distance between the first monitoring hole and the second monitoring hole is 6m, the distance between the second monitoring hole and the third monitoring hole is 4m, and the distance between the third monitoring hole and the fourth monitoring hole is 2 m; putting temperature detection sensors connected with a data collector into the monitoring holes I, the monitoring holes II, the monitoring holes III and the monitoring holes IV respectively, and starting a computer host and the data collector to detect the initial temperatures of the monitoring holes I, the monitoring holes II, the monitoring holes III and the monitoring holes IV 10min before the hydraulic fracturing starts; the hot water is poured into the water tank, hydraulic fracturing is carried out on the fracturing holes, meanwhile, the hot water is poured into the coal bed, the temperature of the coal bed is changed, the investigation on the effect of the underground hydraulic fracturing influence area is realized through detecting the temperature change of the first monitoring hole, the second monitoring hole, the third monitoring hole and the fourth monitoring hole, the operation is simple, the monitoring is accurate, the effect is obvious, and the wide practicability is achieved.
Description
Technical Field
The invention relates to a method for investigating an underground hydraulic fracturing influence area, belongs to the field of underground coal mine area outburst prevention, and is particularly suitable for the field of effect investigation of a coal seam hydraulic fracturing influence area.
Background
The geological conditions of coal mines in China are complex, high gas coal seams account for 50% -70%, and high gas coal seams account for about 70% of the coal seams. Moreover, the coal seam with high gas and low gas permeability is characterized by microporosity, low permeability and high adsorbability, so that a large amount of gas is often discharged in the mining process, particularly, the gas discharge amount is increased along with the high-efficiency intensification of coal production and the increase of mining depth, and the threat of gas explosion and gas outburst danger is increased.
Recent practices prove that hydraulic fracturing can play a good role in pressure relief and permeability increase on coal, greatly improve the gas extraction efficiency and achieve certain extraction and outburst prevention effects. However, the existing hydraulic fracturing effect investigation only stays in a very traditional means, a gas extraction drill hole is arranged near a fracturing hole, traditional indexes such as drilling cuttings amount and water content are investigated, and the gas extraction effect is investigated, and the parameters cannot realize the monitoring and investigation of a hydraulic fracturing influence area (outburst prevention area), so that the hydraulic fracturing application is blind, time and labor are wasted, time and materials are seriously wasted, and meanwhile, the hydraulic fracturing influence area is unknown, so that the gas extraction in the later period is difficult. The existing method for inspecting the hydraulic fracturing affected zone is only stress monitoring and is used for monitoring the stress state of a coal body of a hydraulic fracturing working face, but the stress of the working face is related to a mining process and periodic incoming pressure, so that the influence of hydraulic fracturing cannot be effectively, accurately and comprehensively reflected by monitoring the stress. Therefore, research on the method for investigating the underground hydraulic fracturing influence area is urgently needed, accurate and comprehensive investigation on the underground hydraulic fracturing influence area is realized, and the requirement of design of underground coal mine drilling gas extraction is met.
Disclosure of Invention
The technical problem is as follows: the invention aims to provide the method for investigating the influence area of the underground hydraulic fracturing, which is convenient to operate, simple in process, accurate in area investigation and obvious in effect, aiming at the defect of investigating the effect of the influence area of the underground hydraulic fracturing.
The technical scheme is as follows:
the invention discloses a method for investigating an underground hydraulic fracturing influence area, which comprises the steps of constructing a fracturing hole on a roadway to a coal seam, sending a fracturing pipe into the drilling hole, sealing the drilling hole by adopting a sealing material, connecting the fracturing pipe with a first high-pressure rubber pipe through a valve, connecting the other end of the first high-pressure rubber pipe with a fracturing pump, connecting the other end of the fracturing pump with a water tank through a second high-pressure rubber pipe, and arranging a pressure gauge on the first high-pressure rubber pipe, and is characterized by comprising the following steps of:
a. constructing a first monitoring hole, a second monitoring hole, a third monitoring hole and a fourth monitoring hole on the same horizontal line at two ends of the fracturing hole in sequence, wherein the distance between the fracturing hole and the first monitoring hole is 8m, the distance between the first monitoring hole and the second monitoring hole is 6m, the distance between the second monitoring hole and the third monitoring hole is 4m, and the distance between the third monitoring hole and the fourth monitoring hole is 2 m;
b. the temperature detection sensors are respectively connected with a data collector through leads, and the data collector is connected with a computer host through optical fibers;
c. respectively putting temperature detection sensors into the first monitoring hole, the second monitoring hole, the third monitoring hole and the fourth monitoring hole;
d. starting a computer host and a data collector to detect the initial temperature in a first monitoring hole, a second monitoring hole, a third monitoring hole and a fourth monitoring hole 10min before hydraulic fracturing begins;
e. the method comprises the steps of pouring hot water into a water tank, opening a fracturing pump, performing hydraulic fracturing on fracturing holes, detecting temperature changes of a first monitoring hole, a second monitoring hole, a third monitoring hole and a fourth monitoring hole by a computer host and a data collector, injecting the hot water into a coal bed to cause changes of the temperature of the coal bed, and realizing investigation on the effect of an underground hydraulic fracturing influence area by detecting the temperature changes of the first monitoring hole, the second monitoring hole, the third monitoring hole and the fourth monitoring hole.
The temperature of the hot water is 70-80 ℃. The aperture of the first monitoring hole, the aperture of the second monitoring hole, the aperture of the third monitoring hole and the aperture of the fourth monitoring hole are 20-30 mm, and the hole length is the same as the fracturing hole length.
Has the advantages that: by adopting the technical scheme, the temperature of the coal seam is changed by injecting hot water into the coal seam, and the temperature change of the first monitoring hole, the second monitoring hole, the third monitoring hole and the fourth monitoring hole is detected to realize the investigation of the effect of the underground hydraulic fracturing affected area.
Drawings
FIG. 1 is a borehole arrangement diagram of a method for investigating an affected area of a downhole hydraulic fracture according to the present invention.
FIG. 2 is a schematic diagram of an embodiment of a method for inspecting an affected area of a downhole hydraulic fracture according to the present invention.
In the figure: 1-fracturing hole, 2-first monitoring hole, 3-second monitoring hole, 4-third monitoring hole, 5-fourth monitoring hole, 6-coal bed, 7-temperature detection sensor, 8-fracturing pipe, 9-water tank, 10-fracturing pump, 11-hot water, 12-second high-pressure rubber pipe, 13-first high-pressure rubber pipe, 14-pressure gauge, 15-valve, 16-sealing material, 17-data acquisition unit, 18-lead, 19-optical fiber, 20-computer host.
The specific implementation mode is as follows:
the embodiments of the invention will be further described with reference to the accompanying drawings in which:
the method for inspecting the underground hydraulic fracturing influence area comprises the steps of constructing a fracturing hole 1 on a roadway 6, conveying a fracturing pipe 8 into the drilling hole 1, meanwhile, sealing the drilling hole 1 by adopting a sealing material 16, connecting the fracturing pipe 8 with a first high-pressure rubber pipe 13 through a valve 15, connecting the other end of the first high-pressure rubber pipe 13 with a fracturing pump 10, connecting the other end of the fracturing pump 10 with a water tank 9 through a second high-pressure rubber pipe 12, and arranging a pressure gauge 14 on the first high-pressure rubber pipe 13. Firstly, constructing a first monitoring hole 2, a second monitoring hole 3, a third monitoring hole 4 and a fourth monitoring hole 5 on the same horizontal line at two ends of a fracturing hole 1 respectively in sequence, wherein the distance between the fracturing hole 1 and the first monitoring hole 2 is 8m, the distance between the first monitoring hole 2 and the second monitoring hole 3 is 6m, the distance between the second monitoring hole 3 and the third monitoring hole (4) is 4m, and the distance between the third monitoring hole 4 and the fourth monitoring hole 5 is 2 m; the temperature detection sensor 7 is respectively connected with a data collector 17 through a lead 18, and the data collector 17 is connected with a computer host 20 through an optical fiber 19; respectively putting temperature detection sensors 7 into the first monitoring hole 2, the second monitoring hole 3, the third monitoring hole 4 and the fourth monitoring hole 5; starting the computer host 20 and the data collector 17 to detect the initial temperatures in the first monitoring hole 2, the second monitoring hole 3, the third monitoring hole 4 and the fourth monitoring hole 5 10min before the hydraulic fracturing starts; pour into hot water 11 in the water tank 9, open fracturing pump 10, carry out hydraulic fracturing to fracturing hole 1, simultaneously, computer 20 and data acquisition unit 17 detect monitoring hole one 2, monitoring hole two 3, the temperature variation of monitoring hole three 4 and monitoring hole four 5, and hot water 11 pours into in the coal seam 6, arouses the change of coal seam 6 temperature, realizes the investigation to the regional effect of underground hydraulic fracturing influence through detecting the temperature variation of monitoring hole one 2, monitoring hole two 3, monitoring hole three 4 and monitoring hole four 5. The temperature of the hot water 11 is 70-80 ℃. The aperture of the first monitoring hole 2, the second monitoring hole 3, the third monitoring hole 4 and the fourth monitoring hole 5 is 20-30 mm, and the hole length is the same as that of the fracturing hole 1. The implementation mode is not influenced by physical and mechanical properties of underground coal bodies, coal rock fracture structures, working face stress, mining stress and periodic pressure, can accurately, effectively and comprehensively investigate the hydraulic fracturing influence area, is simple to operate, accurate in monitoring, obvious in effect and wide in practicability.
Claims (3)
1. The underground hydraulic fracturing affected area investigation method comprises the steps of constructing a fracturing hole (1) on a roadway face towards a coal seam (6), sending a fracturing pipe (8) into the fracturing hole (1), meanwhile, sealing the fracturing hole (1) by adopting a sealing material (16), connecting the fracturing pipe (8) with a first high-pressure rubber pipe (13) through a valve (15), connecting the other end of the first high-pressure rubber pipe (13) with a fracturing pump (10), connecting the other end of the fracturing pump (10) with a water tank (9) through a second high-pressure rubber pipe (12), and arranging a pressure gauge (14) on the first high-pressure rubber pipe (13), and is characterized by comprising the following steps of:
a. constructing a first monitoring hole (2), a second monitoring hole (3), a third monitoring hole (4) and a fourth monitoring hole (5) on the same horizontal line at two ends of the fracturing hole (1) in sequence, wherein the distance between the fracturing hole (1) and the first monitoring hole (2) is 8m, the distance between the first monitoring hole (2) and the second monitoring hole (3) is 6m, the distance between the second monitoring hole (3) and the third monitoring hole (4) is 4m, and the distance between the third monitoring hole (4) and the fourth monitoring hole (5) is 2 m;
b. the temperature detection sensor (7) is respectively connected with a data collector (17) through a lead (18), and the data collector (17) is connected with a computer host (20) through an optical fiber (19);
c. respectively putting temperature detection sensors (7) into the monitoring hole I (2), the monitoring hole II (3), the monitoring hole III (4) and the monitoring hole IV (5);
d. starting a computer host (20) and a data collector (17) to detect the initial temperatures in a first monitoring hole (2), a second monitoring hole (3), a third monitoring hole (4) and a fourth monitoring hole (5) 10min before hydraulic fracturing begins;
e. pour into hot water (11) in water tank (9), open fracturing pump (10), carry out hydraulic fracturing to fracturing hole (1), simultaneously, computer (20) and data collection station (17) detect monitoring hole (2), monitoring hole two (3), the temperature variation of monitoring hole three (4) and monitoring hole four (5), hot water (11) are poured into in coal seam (6), arouse the change of coal seam (6) temperature, through detecting monitoring hole one (2), monitoring hole two (3), the temperature variation of monitoring hole three (4) and monitoring hole four (5) realizes the investigation to the regional effect of hydraulic fracturing influence in the pit.
2. The method for examining the influence area of the hydraulic fracture in the well as claimed in claim 1, wherein: the temperature of the hot water (11) is 70-80 ℃.
3. The method for examining the influence area of the hydraulic fracture in the well as claimed in claim 1, wherein: the aperture of the first monitoring hole (2), the second monitoring hole (3), the third monitoring hole (4) and the fourth monitoring hole (5) is 20-30 mm, and the hole length is the same as that of the fracturing hole (1).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710248145.7A CN107100612B (en) | 2017-04-17 | 2017-04-17 | Method for investigating underground hydraulic fracturing influence area |
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| CN201710248145.7A CN107100612B (en) | 2017-04-17 | 2017-04-17 | Method for investigating underground hydraulic fracturing influence area |
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| CN107100612B true CN107100612B (en) | 2020-05-05 |
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Families Citing this family (6)
| 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 |
| CN108386193A (en) * | 2018-02-02 | 2018-08-10 | 陕西煤业化工技术研究院有限责任公司 | A kind of hard integrality top plate chemically expansible pressure break pressure relief method in end |
| CN108756883A (en) * | 2018-06-11 | 2018-11-06 | 陕西煤业化工技术研究院有限责任公司 | A kind of coal mine tight roof slip casting fracturing process and system |
| CN110067548B (en) * | 2019-06-10 | 2023-05-16 | 河南理工大学 | Coal mine underground high-temperature hydraulic fracturing permeability-increasing method and system |
| CN110965964B (en) * | 2019-12-16 | 2021-10-12 | 临沂矿业集团菏泽煤电有限公司 | Gas extraction method for ultra-thick coal seam |
| CN112145073B (en) * | 2020-09-28 | 2022-04-01 | 中国矿业大学 | In-situ controllable coal and gas outburst process physical simulation method |
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