CN111075442A - Method for verifying extension length of fracturing main crack of coal-bed gas well - Google Patents
Method for verifying extension length of fracturing main crack of coal-bed gas well Download PDFInfo
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- CN111075442A CN111075442A CN201911364043.7A CN201911364043A CN111075442A CN 111075442 A CN111075442 A CN 111075442A CN 201911364043 A CN201911364043 A CN 201911364043A CN 111075442 A CN111075442 A CN 111075442A
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- 238000000034 method Methods 0.000 title claims abstract description 23
- 239000003245 coal Substances 0.000 claims abstract description 30
- 238000005259 measurement Methods 0.000 claims abstract description 14
- 238000012544 monitoring process Methods 0.000 claims abstract description 11
- 238000010276 construction Methods 0.000 claims abstract description 7
- 238000005516 engineering process Methods 0.000 claims abstract description 7
- 239000007788 liquid Substances 0.000 claims abstract description 7
- 239000004576 sand Substances 0.000 claims abstract description 6
- 238000004458 analytical method Methods 0.000 claims abstract description 4
- 238000010835 comparative analysis Methods 0.000 claims abstract description 4
- 230000009466 transformation Effects 0.000 claims abstract description 4
- 238000004364 calculation method Methods 0.000 claims abstract 2
- 239000012530 fluid Substances 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- NJDNXYGOVLYJHP-UHFFFAOYSA-L disodium;2-(3-oxido-6-oxoxanthen-9-yl)benzoate Chemical class [Na+].[Na+].[O-]C(=O)C1=CC=CC=C1C1=C2C=CC(=O)C=C2OC2=CC([O-])=CC=C21 NJDNXYGOVLYJHP-UHFFFAOYSA-L 0.000 claims description 3
- 238000010586 diagram Methods 0.000 claims description 2
- 238000012795 verification Methods 0.000 claims description 2
- 238000005286 illumination Methods 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 19
- 230000000694 effects Effects 0.000 description 5
- 238000003825 pressing Methods 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- GNBHRKFJIUUOQI-UHFFFAOYSA-N fluorescein Chemical class O1C(=O)C2=CC=CC=C2C21C1=CC=C(O)C=C1OC1=CC(O)=CC=C21 GNBHRKFJIUUOQI-UHFFFAOYSA-N 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 229910052785 arsenic Inorganic materials 0.000 description 1
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 238000013524 data verification Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010291 electrical method Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur 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
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
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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
- E21B43/006—Production of coal-bed methane
-
- 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
- E21B43/267—Methods for stimulating production by forming crevices or fractures reinforcing fractures by propping
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- Engineering & Computer Science (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Physics & Mathematics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Geophysics And Detection Of Objects (AREA)
Abstract
The invention relates to the technical field of coal bed gas exploitation fracturing, in particular to a method for verifying the extension length of a fracturing main fracture of a coal bed gas well. The method solves the problem of determining the accurate length range of the fracturing crack in the coal bed gas exploration and exploitation process. A method for verifying the extension length of a main fracturing crack of a coal-bed gas well comprises the steps of firstly combining the engineering progress of a coal mine, laying a ground coal-bed gas well in advance, carrying out fluorescer transformation on fracturing sand and fracturing liquid which enter a coal bed during fracturing construction, judging the approximate direction of the main fracture by utilizing a micro-seismic crack monitoring technology on the ground during fracturing, laying an ultraviolet searchlight for the coal mine in front of a stoping working face, requiring an irradiation range to cover the working face, illuminating a display bright-colored area through illumination, then collecting data, obtaining the accurate influence length of the crack after calculation, and carrying out comparative analysis on the data and ground measurement data to carry out error analysis on the ground measurement data so as to improve the accuracy of the ground measurement data.
Description
Technical Field
The invention relates to the technical field of coal bed gas exploitation fracturing, in particular to a method for verifying the extension length of a fracturing main fracture of a coal bed gas well.
Background
In coal bed gas exploration and exploitation, fracturing is one of key technologies for coal bed gas extraction. Due to the particularity of the geological structure of the working area, the extension length of the fractured main fracture cannot be directly measured. The method is mainly characterized in that ground crack monitoring technologies (such as micro-seismic and electrical methods) are mostly adopted to collect signal data received in the fracturing process, and data processing is carried out through different models or formulas in the later stage to obtain the fracture monitoring data. However, after one fracturing is finished, any detection method is brief introduction and measurement, so that different technologies are adopted to detect the fracturing, so that a plurality of different results can be produced, and the conclusion is argued as 32429, the error range is difficult to estimate, and personnel cannot go deep into the stratum to measure, so that the corresponding recovery effect of the coal-bed gas well in the area is difficult to define. Based on the above phenomena, a set of methods is urgently sought for the verification of the extension of the main crack.
Disclosure of Invention
The invention provides a method for verifying the extension length of a main fracturing fracture of a coal-bed gas well, aiming at solving the problem of determining the accurate length range of the fracturing fracture in the coal-bed gas exploration and exploitation process.
The invention has the technical scheme that a method for verifying the extension length of a fracturing main crack of a coal-bed gas well comprises the steps of firstly, combining the engineering progress of a coal mine, laying a ground coal-bed gas well in advance, pressing fracturing sand and fracturing liquid into the coal bed after fluorescent agent transformation during fracturing construction, judging the approximate direction of the main crack on the ground by utilizing a microseism crack monitoring technology during the fracturing process, then judging the appearance area and the direction of the main crack in advance by contrasting an underground construction progress diagram, making an important monitoring area for a stope face to be possibly revealed, laying an ultraviolet searchlight for the coal mine in front of the stope face, requiring an irradiation range to cover the working face, acquiring data when bright water stains are disclosed as the extension end head of the main crack in the stope project, calculating to obtain the accurate length of the main crack, observing the revealing area of a fracturing liquid in the subsequent stope focus, and performing comparative analysis on the data and ground measurement data to perform error analysis on the ground measurement data so as to improve the accuracy of the ground measurement data.
The invention has the following beneficial effects:
1. the method provides field data verification for the extension length of the main fracture after fracturing, and can scientifically define the recovery ratio of the developed coal-bed gas well in the area according to the total gas content of the fracturing affected area and the extraction amount of the coal-bed gas well;
2. the invention provides guiding data for the coal bed gas fracturing industry, so that the whole industry achieves a consensus on the concept, provides field data support for the establishment of coal bed gas enterprise standards, fracturing industry standards and even national standards, provides field feedback for numerous ground micro-seismic monitoring enterprises, is beneficial to the technical innovation of the enterprises, and optimizes and accurately establishes data processing and models;
3. the method can be applied to the early exploration wells of new blocks, the actual measurement data of crack extension are combined, the gas production prospect and the investment recovery period of the area are scientifically judged, and once the fracturing effect is poor, the loss of an enterprise can be reduced to a great extent by blind batch investment.
Drawings
FIG. 1 is a design drawing of an embodiment of the present invention
In the figure, 1 is a ground fracturing device, 2 is a micro-seismic fracture monitoring system, and 3 is a coal bed gas well. 4-underground mining equipment, 5-ultraviolet searchlight for coal mine, 6-main crack and 7-coal bed.
Detailed Description
As shown in figure 1, a method for verifying the extension length of a main fracturing crack of a coal-bed gas well comprises the steps of firstly, combining the engineering progress of a coal mine, laying a ground coal-bed gas well 3 in advance, during fracturing construction, pressing and pressing fracturing sand and fracturing liquid into a coal bed after fluorescent agent transformation, judging the approximate direction of the main fracturing crack 6 on the ground by using a micro-seismic crack monitoring technology in the fracturing process, then judging the occurrence region and the direction of the main fracturing in advance by comparing with a downhole construction progress chart, making an important monitoring region for a stope face to be possibly revealed, laying a coal mine ultraviolet searchlight 5 in front of the stope face, requiring an irradiation range to cover the working face, when a bright water stain is revealed in the stope engineering, namely the end of the extension of the main fracturing 4, then collecting data, calculating to obtain the accurate length of the main fracturing crack, and subsequently adopting the important observation area of fracturing liquid, and performing comparative analysis on the data and ground measurement data to perform error analysis on the ground measurement data so as to improve the accuracy of the ground measurement data.
The method for modifying the fracturing fluid is to add 5-10g of fluorescein sodium salt into 1000Kg of water to prepare the fracturing fluid. The sodium fluorescein salt is attached to the frac sand. The sodium fluorescein salt contained in the fracturing fluid can show obvious bright color under the irradiation of ultraviolet rays, particularly under the environment of coal, and can show the traces of the fracturing fluid and fracturing sand.
The wave band of the ultraviolet searchlight for the coal mine is 365nm, and the effect is best. Coal contains many kinds of substances, and the elements mainly include carbon, hydrogen, oxygen, nitrogen, sulfur, and the like, and further, elements such as phosphorus, fluorine, chlorine, arsenic, and the like are present in a very small amount. In order to prevent these components from interfering with the color development effect, it was found through a large number of experiments that the color development effect was the best when 365nm ultraviolet rays and a fluorescein sodium salt were used.
Claims (3)
1. A coal bed gas well fracturing main crack extension length verification method is characterized in that firstly, a ground coal bed gas well (3) is laid in advance by combining the engineering progress of a coal mine, fracturing sand and fracturing liquid after fluorescent agent transformation are pressed into the coal bed during fracturing construction, the rough direction of a main crack (6) is judged on the ground by utilizing a microseism crack monitoring technology in the fracturing process, then the occurrence region and the direction of the main crack are judged in advance by comparing with an underground construction progress diagram, a key monitoring region is made for a stope face which is to be possibly uncovered, an ultraviolet searchlight (5) for the coal mine is laid in front of the stope face, the irradiation range is required to cover the stope face, when bright water stains are revealed in the stope engineering, namely the end of extension of the main crack (4), data is acquired, the accurate length of the main crack is obtained after calculation, and the revealing region of the fracturing liquid is observed subsequently, and performing comparative analysis on the data and ground measurement data to perform error analysis on the ground measurement data so as to improve the accuracy of the ground measurement data.
2. The method for verifying the extension length of the main fracture of the coal-bed gas well is characterized in that the fracturing fluid is prepared by adding 5-10g of sodium fluorescein salt into 1000Kg of water.
3. The method for verifying the extension length of the main fracture of the coal-bed gas well fracture as recited in claim 1, wherein the wave band of an ultraviolet searchlight for coal mines is 365 nm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911364043.7A CN111075442A (en) | 2019-12-26 | 2019-12-26 | Method for verifying extension length of fracturing main crack of coal-bed gas well |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911364043.7A CN111075442A (en) | 2019-12-26 | 2019-12-26 | Method for verifying extension length of fracturing main crack of coal-bed gas well |
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| CN111075442A true CN111075442A (en) | 2020-04-28 |
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| CN201911364043.7A Pending CN111075442A (en) | 2019-12-26 | 2019-12-26 | Method for verifying extension length of fracturing main crack of coal-bed gas well |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112031724A (en) * | 2020-07-31 | 2020-12-04 | 中国地质大学（武汉） | Method for observing hydraulic fracturing fracture of coal-bed gas well |
| CN112253072A (en) * | 2020-11-05 | 2021-01-22 | 中国石油化工股份有限公司石油工程技术研究院 | Rock fracture model and proppant migration and placement device and method in rock fracture |
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| CN102182446A (en) * | 2011-05-12 | 2011-09-14 | 兴和鹏能源技术(北京)有限公司 | Mine monitoring method and equipment |
| CN102279131A (en) * | 2011-07-18 | 2011-12-14 | 中国石油大学(北京) | Simulation experiment method of coal seam hydraulic fracture |
| CN105793385A (en) * | 2013-08-30 | 2016-07-20 | 优选技术有限责任公司 | Proppant with composite coating |
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| WO2019018234A2 (en) * | 2017-07-21 | 2019-01-24 | Saint-Gobain Ceramics & Plastics, Inc. | Proppants and process for making the same |
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2019
- 2019-12-26 CN CN201911364043.7A patent/CN111075442A/en active Pending
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| CN102182446A (en) * | 2011-05-12 | 2011-09-14 | 兴和鹏能源技术(北京)有限公司 | Mine monitoring method and equipment |
| CN102279131A (en) * | 2011-07-18 | 2011-12-14 | 中国石油大学(北京) | Simulation experiment method of coal seam hydraulic fracture |
| CN105793385A (en) * | 2013-08-30 | 2016-07-20 | 优选技术有限责任公司 | Proppant with composite coating |
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| WO2019018234A2 (en) * | 2017-07-21 | 2019-01-24 | Saint-Gobain Ceramics & Plastics, Inc. | Proppants and process for making the same |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112031724A (en) * | 2020-07-31 | 2020-12-04 | 中国地质大学（武汉） | Method for observing hydraulic fracturing fracture of coal-bed gas well |
| CN112031724B (en) * | 2020-07-31 | 2022-06-24 | 中国地质大学（武汉） | Method for observing hydraulic fracturing fracture of coal-bed gas well |
| CN112253072A (en) * | 2020-11-05 | 2021-01-22 | 中国石油化工股份有限公司石油工程技术研究院 | Rock fracture model and proppant migration and placement device and method in rock fracture |
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Application publication date: 20200428 |