CN104453792A - Coal seam mining method and structure - Google Patents
Coal seam mining method and structure Download PDFInfo
- Publication number
- CN104453792A CN104453792A CN201410315016.1A CN201410315016A CN104453792A CN 104453792 A CN104453792 A CN 104453792A CN 201410315016 A CN201410315016 A CN 201410315016A CN 104453792 A CN104453792 A CN 104453792A
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- China
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- perforation
- horizontal well
- well
- bridging plug
- coal seam
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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
- E21B43/006—Production of coal-bed methane
-
- 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
Abstract
The invention discloses a coal seam mining method and structure. The method comprises the following steps that a vertical well is drilled from the ground to a rock layer, a horizontal well parallel to a coal seam is formed in the surrounding rock layer, a bridge plug and a perforating combining operation pipe string are put in through downhole tools after setting of the transverse well is finished, perforating is implemented after the bridge plug is sealed, the perforating combining operation pipe string is lifted upwards, fracturing operation is implemented, the steps are repeated to complete bridge plug packing, perorating and fracturing operation of other sections, multi-level fracture pressure is achieved in the horizontal well, the bridge plug is drilled through a drilling tool, dumping and mining tools are put in, and liquid drainage and gas production are implemented. According to the coal seam mining method and structure, the transverse well is formed in the surrounding rock layer, the collapse risk is reduced in a horizontal section drilling process, and the problem that well walls collapse in the following dumping and mining process is also solved; then, multi-level packing, perforating and fracturing of the coal seam are achieved in the horizontal well through a perforating gun and the bridge plug, the gas and water flow situation in the coal seam is improved, and the yield of the coal seam is increased.
Description
Technical field
The present invention relates to a kind of seam mining method and structure, belong to Coal-seam Gas Recovery Technologies field.
Background technology
In order to improve ground coal bed gas exploitation output, China's mining of coal bed gas technology is developed towards multi-branched horizontal well, far-end butt shaft by single straight well and is developed from diversified drilling and production technology systems such as formula wells.But due to coal bed texture instability, in follow-up mining process, horizontal section wellbore easily caves in, thus causes well to block, and then affects methane output.For this problem, also there is no solution at present.
Summary of the invention
The object of the invention is: a kind of seam mining method and structure are provided, the country rock place of roof is arranged on by horizontal well, reduce the risk of caving in horizontal segment drilling process, it also avoid cave-in problem in mining process from now on, multistage fracturing operation is implemented at casing horizontal segment, ensure that reservoir reconstruction scope, ensured high yield tolerance from now on, thus overcome the deficiencies in the prior art.
Technical scheme of the present invention
A kind of seam mining method, comprise and open straight well from ground and get into rock stratum, between casing, offer the horizontal well parallel with coal seam, after horizontal well is provided with, utilize downhole tool, under enter bridging plug and perforation connection make pipe string, implement perforation after setting bridging plug, above carry perforation connection and make pipe string, implement fracturing work, repeat above-mentioned steps and become the bridging plug packing of all the other sections, perforation and fracturing work, be formed in horizontal well and realize multistagely splitting pressure, utilize drilling tool to bore and open bridging plug, more lower mining execution of instrument liquid discharging gas producing operation.
In aforesaid seam mining method, perforating gun and bridging plug one are joined by perforation to be made pipe and contacts and connect, by downhole tool, perforating gun and bridging plug one are put into horizontal well assigned address, now expansion bridge plug one is to realize the shutoff to horizontal well, then utilize perforating gun to carry out perforation to horizontal well to make to form crack between horizontal well and coal seam, then in crack, be full of sandstone form fracturing work, after completing, perforating gun and perforation connection are made pipe string to take out, add bridging plug two again and put into horizontal well, the interval of bridging plug two and bridging plug one remains on 40m ~ 100m, then expansion bridge plug two is to realize the shutoff to horizontal well, then perforation and fill sandstone formed fracturing work.The same manner completes other section of operation.
In aforesaid seam mining method, said method concrete technology is:
Step one, straight well and horizontal well make, and namely between ground and casing, are drilled with straight well, are drilled with horizontal well between casing;
Step 2, first paragraph perforation and pressure break, first paragraph is without the need to bridging plug, and only perforating gun need be adopted to be placed on assigned address, then perforation, forms crack between horizontal well and coal seam, fills sandstone and form fracturing work between crack;
Step 3, second segment perforation and pressure break, put bridging plug by horizontal down-hole, perforation connection make pipe string and perforating gun, perforating gun distance first paragraph crack distance is 40m ~ 100m, it is setting that expansion bridge plug realizes bridging plug, and then perforation forms crack, fills sandstone and form second segment fracturing work;
Step 4, the same manner, completes the bridging plug packing of all the other sections, perforation and pressure break;
Step 5, adopts continuous tubing drill except bridging plug, more lower mining execution of instrument liquid discharging gas producing operation.
In aforesaid seam mining method, this gun perforation process adopts in direction of maximal stress and implements oriented perforating technology, and perforation direction and towards coal seam, guarantee that realizing crack in coal seam in fracturing process effectively expands.
A kind of seam mining structure, comprises and arranges the band straight well of position, rock stratum and the horizontal well in position, rock stratum from ground, be provided with curved well, be provided with at least 2 fracture layers, between fracture layers, be full of sandstone between horizontal well and coal seam between straight well and horizontal well.
Aforesaid multiple seam is closed and is adopted in structure, and described fracture layers spacing is 40m ~ 100m.
Owing to adopting technique scheme, compared with prior art, the present invention is by arranging horizontal well at casing, reduce the risk of caving in horizontal segment drilling process, it also avoid cave-in problem in mining process from now on, then in horizontal well, realize to coal seam how long packing, perforation and pressure break by perforating gun and bridging plug, improve the inner gas current conditions in coal seam, improve coal seam output.
Accompanying drawing explanation
Accompanying drawing 1 is straight well and horizontal well construction schematic diagram in the present invention;
Accompanying drawing 2 is perforating gun bridging plug installation site in the present invention;
Accompanying drawing 3 presses through journey for perforating gun perforation in the present invention and bridging plug expand to split;
Accompanying drawing 4 finally forms structure for the present invention
Being labeled as in accompanying drawing: the horizontal well of 1-straight well, 2-, the curved well of 3-, 4-fracture layers, 5-sandstone, 6-casing, 7-coal seam, 8-perforating gun, 9-perforation connection make pipe string, 10-bridging plug.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is further described in detail, but not as any limitation of the invention.
Embodiments of the invention: a kind of seam mining method, the method is opened straight well from ground and is got into casing, the horizontal well parallel with coal seam is offered between casing, it is characterized in that: after horizontal well is provided with, utilize downhole tool, under enter bridging plug and perforation connection make pipe string, perforation is implemented after setting bridging plug, on carry perforation connection make pipe string, implement fracturing work, repeat above-mentioned steps and become the bridging plug packing of all the other sections, perforation and fracturing work, be formed in horizontal well and realize multistagely splitting pressure, utilize drilling tool to bore and open bridging plug, more lower mining execution of instrument liquid discharging gas producing operation.
Wherein perforating gun and bridging plug one are joined by perforation and make pipe and contact and connect, by downhole tool, perforating gun and bridging plug one are put into horizontal well assigned address, now expansion bridge plug one is to realize the shutoff to horizontal well, then utilize perforating gun to carry out perforation to horizontal well to make to form crack between horizontal well and coal seam, then in crack, be full of sandstone form fracturing work, after completing, perforating gun and perforation connection are made pipe string to take out, add bridging plug two again and put into horizontal well, the interval of bridging plug two and bridging plug one remains on 40m ~ 100m, then expansion bridge plug two is to realize the shutoff to horizontal well, then perforation and fill sandstone formed fracturing work.The same manner completes other section of operation, and above-mentioned gun perforation process adopts in direction of maximal stress and implements oriented perforating technology, and perforation direction and towards coal seam, guarantee that realizing crack in coal seam in fracturing process effectively expands.
Concrete technology is:
Step one, straight well and horizontal well make, and namely between ground and casing, are drilled with straight well, are drilled with horizontal well between casing;
Step 2, first paragraph perforation and pressure break, first paragraph is without the need to bridging plug, and only perforating gun need be adopted to be placed on assigned address, then perforation, forms crack between horizontal well and coal seam, fills sandstone and form fracturing work between crack;
Step 3, second segment perforation and pressure break, put bridging plug by horizontal down-hole, perforation connection make pipe string and perforating gun, perforating gun distance first paragraph crack distance is 40m ~ 100m, it is setting that expansion bridge plug realizes bridging plug, and then perforation forms crack, fills sandstone and form second segment fracturing work;
Step 4, the same manner, completes the bridging plug packing of all the other sections, perforation and pressure break;
Step 5, adopts continuous tubing drill except bridging plug, more lower mining execution of instrument liquid discharging gas producing operation.
A kind of seam mining structure constructed by said method, as shown in drawings, comprise and the band straight well 1 of position, rock stratum and the horizontal well 2 in position, rock stratum are set from ground, curved well 3 is provided with between straight well 1 and horizontal well 2, at least 2 fracture layers 4 are provided with between horizontal well 2 and coal seam, spacing between this fracture layers 4 is 40m ~ 100m, is full of sandstone 5 between fracture layers 4.
Main feature of the present invention is, by arranging horizontal well at the casing on top, coal seam, and construct in horizontal well pressure is split to the frequent multistage in coal seam, the method Main Function is the risk of caving in reduced in horizontal segment drilling process, it also avoid cave-in problem in mining process from now on, and multistage is carried out to coal seam split pressure, ensure that in coal seam, air current flow is good, and respectively intersegmentally can not to disturb each other, the tolerance improving coal seam is high adopts.
Splitting at real-time multistage presses through in journey, the present invention adopt perforating gun and bridging plug with the use of, carrying out perforation to perforating gun first paragraph, after back-up sand splits pressure, between first paragraph and second segment, packing is realized with bridging plug after expansion, like this when perforating gun carries out second segment perforation, the operation that air pressure can not interfere with second segment perforation, pressure is split in back-up sand of first paragraph, has saved engineering time and difficulty greatly.
Claims (6)
1. a seam mining method, the method is opened straight well from ground and is got into rock stratum, the horizontal well parallel with coal seam is offered between casing, it is characterized in that: after horizontal well is provided with, utilize downhole tool, under enter bridging plug and perforation connection make pipe string, perforation is implemented after setting bridging plug, on carry perforation connection make pipe string, implement fracturing work, repeat above-mentioned steps and become the bridging plug packing of all the other sections, perforation and fracturing work, be formed in horizontal well and realize multistagely splitting pressure, utilize drilling tool to bore and open bridging plug, more lower mining execution of instrument liquid discharging gas producing operation.
2. seam mining method according to claim 1, it is characterized in that: perforating gun and bridging plug one are joined by perforation to be made pipe and contact and connect, by downhole tool, perforating gun and bridging plug one are put into horizontal well assigned address, now expansion bridge plug one is to realize the shutoff to horizontal well, then utilize perforating gun to carry out perforation to horizontal well to make to form crack between horizontal well and coal seam, then in crack, be full of sandstone form fracturing work, after completing, perforating gun and perforation connection are made pipe string to take out, add bridging plug two again and put into horizontal well, the interval of bridging plug two and bridging plug one remains on 40m ~ 100m, then expansion bridge plug two is to realize the shutoff to horizontal well, then perforation and fill sandstone formed fracturing work,
The same manner completes other section of operation.
3. seam mining method according to claim 1, is characterized in that: said method concrete technology is:
Step one, straight well and horizontal well make, and namely between ground and casing, are drilled with straight well, are drilled with horizontal well between casing;
Step 2, first paragraph perforation and pressure break, first paragraph is without the need to bridging plug, and only perforating gun need be adopted to be placed on assigned address, then perforation, forms crack between horizontal well and coal seam, fills sandstone and form fracturing work between crack;
Step 3, second segment perforation and pressure break, put bridging plug by horizontal down-hole, perforation connection make pipe string and perforating gun, perforating gun distance first paragraph crack distance is 40m ~ 100m, it is setting that expansion bridge plug realizes bridging plug, and then perforation forms crack, fills sandstone and form second segment fracturing work;
Step 4, the same manner, completes the bridging plug packing of all the other sections, perforation and pressure break;
Step 5, adopts continuous tubing drill except bridging plug, more lower mining execution of instrument liquid discharging gas producing operation.
4. seam mining method according to claim 1, is characterized in that: this gun perforation process adopts in direction of maximal stress and implements oriented perforating technology, and perforation direction and towards coal seam, guarantee that realizing crack in coal seam in fracturing process effectively expands.
5. a seam mining structure, comprise and the band straight well (1) of position, rock stratum and the horizontal well (2) in position, rock stratum are set from ground, curved well (3) is provided with between straight well (1) and horizontal well (2), it is characterized in that: between Heng Jing (2) and coal seam, be provided with at least 2 fracture layers (4), between fracture layers (4), be full of sandstone (5).
6. multiple seam according to claim 5 is closed and is adopted structure, it is characterized in that: described fracture layers (4) spacing is 40m ~ 100m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410315016.1A CN104453792A (en) | 2014-07-04 | 2014-07-04 | Coal seam mining method and structure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410315016.1A CN104453792A (en) | 2014-07-04 | 2014-07-04 | Coal seam mining method and structure |
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| CN104453792A true CN104453792A (en) | 2015-03-25 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109538282A (en) * | 2018-09-28 | 2019-03-29 | 山西晋城无烟煤矿业集团有限责任公司 | A kind of coal bed gas adopts L-type well horizontal segment layer position preferred method |
| CN109751026A (en) * | 2017-11-01 | 2019-05-14 | 中国石油化工股份有限公司 | A kind of method and construction technology promoting pressure break exploitation Fracture System complexity |
| CN113530497A (en) * | 2021-09-17 | 2021-10-22 | 中煤科工集团西安研究院有限公司 | Turning radial well device and sectional guiding horizontal fracturing well coal bed gas extraction method |
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| CN204175251U (en) * | 2014-07-04 | 2015-02-25 | 贵州省煤层气页岩气工程技术研究中心 | A kind of seam mining structure |
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| US20130062055A1 (en) * | 2010-05-26 | 2013-03-14 | Randy C. Tolman | Assembly and method for multi-zone fracture stimulation of a reservoir using autonomous tubular units |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109751026A (en) * | 2017-11-01 | 2019-05-14 | 中国石油化工股份有限公司 | A kind of method and construction technology promoting pressure break exploitation Fracture System complexity |
| CN109751026B (en) * | 2017-11-01 | 2021-11-02 | 中国石油化工股份有限公司 | Method for improving complexity of fracture mining system and construction process |
| CN109538282A (en) * | 2018-09-28 | 2019-03-29 | 山西晋城无烟煤矿业集团有限责任公司 | A kind of coal bed gas adopts L-type well horizontal segment layer position preferred method |
| CN113530497A (en) * | 2021-09-17 | 2021-10-22 | 中煤科工集团西安研究院有限公司 | Turning radial well device and sectional guiding horizontal fracturing well coal bed gas extraction method |
| CN113530497B (en) * | 2021-09-17 | 2021-12-07 | 中煤科工集团西安研究院有限公司 | Turning radial well device and sectional guiding horizontal fracturing well coal bed gas extraction method |
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Application publication date: 20150325 |
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