RU2282722C1 - Coal bed degassing method - Google Patents

Coal bed degassing method Download PDF

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Publication number
RU2282722C1
RU2282722C1 RU2004137960/03A RU2004137960A RU2282722C1 RU 2282722 C1 RU2282722 C1 RU 2282722C1 RU 2004137960/03 A RU2004137960/03 A RU 2004137960/03A RU 2004137960 A RU2004137960 A RU 2004137960A RU 2282722 C1 RU2282722 C1 RU 2282722C1
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RU
Russia
Prior art keywords
well
horizontal
coal seam
coal
drilling
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RU2004137960/03A
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Russian (ru)
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RU2004137960A (en
Inventor
Александр Мирославович Карасевич (RU)
Александр Мирославович Карасевич
Ефим Вульфович Крейнин (RU)
Ефим Вульфович Крейнин
Николай Миронович Сторонский (RU)
Николай Миронович Сторонский
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Открытое акционерное общество "Газпром" (ОАО "Газпром")
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Priority to RU2004137960/03A priority Critical patent/RU2282722C1/en
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Abstract

FIELD: mining, particularly to remove methane from coal beds.
SUBSTANCE: method involves drilling down-dip nearly horizontal well and inclined well from ground surface in coal bed; casing well up to coal bed; connecting horizontal drilled channel with uncased part of inclined well with the use of navigation systems and at final stage by performing directional hydraulic fracturing through inclined well; drilling several down-dip horizontal bores from uncased bore of nearly horizontal well.
EFFECT: increased coverage of inclined coal bed by accordant well pair connected with each other by horizontal drilled channel.
2 cl, 2 dwg

Description

The invention relates to mining, in particular to the problem of extracting methane from coal seams.
A known method of extracting methane from inclined coal seams using vertical, horizontal and inclined boreholes [1]. However, the impact through them on the coal seam using its hydraulic softening is not always possible and requires excessive rates of injection of hydraulic fracturing fluid. In addition, there are no specific recommendations on the extent of field coverage by such wells.
Another well-known technical solution is the drilling of an inclined horizontal well in the soil of an inclined coal seam at the mine to them. A.A. Skochinsky in the Donbass [2]. Fractures with a coal seam were carried out along the length of the deviated well for its preliminary degassing. However, this known method also has a clear drawback, which consists in the limited drainage surface of the created fractures.
The closest technical solution is the method of degassing a coal seam, which consists in drilling from the surface of directional wells by the fall of the coal seam and vertical wells [3].
The disadvantage of this technical solution is the fire effect on the coal seam, which limits the possibility of using this method. In addition, "directional and vertical wells" provide a small coverage area for degassing and are effective only at the depth of drilling of these wells, because they are cased to the full depth to the horizon of the creation of drainage degassing.
The objective of the invention is to provide maximum coverage of the degassing of an inclined coal seam using a pair of wells traversed by the fall of the coal seam connected by a horizontal drilling channel. The large length of the drilling channels, combined in a hydraulically connected system, provides correspondingly large inflows of water at the stage of drainage (creation of a depression funnel) and methane at the stage of degassing of the coal seam.
The problem is solved in that in the known method of degassing a coal seam by drilling a pair of wells, one of which is made horizontally and drilled by the fall of the coal seam, followed by hydraulic communication with the second well. At the same time, the second well is drilled inclined by the dip of the coal seam and connected to the horizontal inclined well into a single hydraulically connected complex using the navigation system, and at the final stage, by directional hydraulic washing through the inclined well. Moreover, the horizontal and inclined wells are cased only before entering the coal seam. In addition, several horizontal drilling channels are drilled from the dip of a coal seam from a horizontal well bore.
A comparative analysis of the claimed solutions with the prototype shows that the claimed method has a maximum coverage of the coal seam zone to be degassed. This is ensured by drilling wells for the dip of the inclined coal seam and their connection into a single hydraulic system (criterion of "novelty").
The large length of the drilling channels along the coal seam combined into a well complex ensures its high drainage ability and the maximum degree of extraction of coal methane from the zone between both wells (criterion of "technical result").
The proposed method is illustrated by the layout of the wells, where Fig. 1 shows carbon-methane wells in the plane of the coal seam, and in Fig. 2 - across the strike of the seam.
An inclined horizontal (or vertical horizontal) well 1 and an inclined well 2 are drilled by the fall of the coal seam (to its maximum depth, for example, 1000 m or more). The casing of both wells ends at the entrance to the coal seam. The horizontal section of the well 3 using the navigation system (s) in the process of drilling is connected to the path of the well 2 at point 4. The connection at point 4 is carried out using a hydraulic monitor (high pressure water jet) directed by hydraulic washing through the well 4.
In order to fully cover the developed zone for the fall of the coal seam from the trunk of an inclined horizontal well, several horizontal drilling channels 5 are drilled, for example, after 300-400 m (depending on the methane content of the corresponding zone of the coal seam by its fall).
The inventive method is planned to be implemented in Kuzbass on an experimental coal-methane site.
Using the method will not only intensify the process of coal methane production (flow rate of 100 thousand m 3 / day), but also increase the degree of its extraction from the coal seam to 90-95%.
Information sources
1. Kreinin E.V. Non-traditional thermal technologies for the extraction of hard-to-recover fuels: coal, hydrocarbon raw materials. M .: LLC "IRC Gazprom", 2004. - 302 p.
2. Yarunin S.A., Lukash A.S., Kokarev V.V. Experience in conducting hydrodynamic effects on a coal-bearing massif through a well with a horizontal end of the trunk. M .: Coal, 1990, No. 6, p. 18-20.
3. Patent No. 2054557, Russian Federation, E 21 F 7/00, 02.20.1996.

Claims (2)

1. The method of degassing a coal seam, which consists in drilling a pair of wells, one of which is made horizontally and drilled by the fall of the coal seam followed by hydraulic communication with the second well, characterized in that the second well is drilled inclined by the fall of the coal seam, where it connected with an inclined horizontal well into a single hydraulically connected complex using a navigation system, and at the final stage, by directional hydraulic washing through an inclined well, and an inclined horizontal Flax and deviated wells are cased only before entering the coal seam.
2. The method of degassing a coal seam according to claim 1, characterized in that several horizontal drilling channels are drilled from a dip of a coal seam from a borehole of an inclined horizontal well.
RU2004137960/03A 2004-12-27 2004-12-27 Coal bed degassing method RU2282722C1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
RU2004137960/03A RU2282722C1 (en) 2004-12-27 2004-12-27 Coal bed degassing method

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Application Number Priority Date Filing Date Title
RU2004137960/03A RU2282722C1 (en) 2004-12-27 2004-12-27 Coal bed degassing method

Publications (2)

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RU2004137960A RU2004137960A (en) 2006-06-10
RU2282722C1 true RU2282722C1 (en) 2006-08-27

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2453705C1 (en) * 2011-01-13 2012-06-20 Учреждение Российской академии наук Институт проблем комплексного освоения недр Российской академии наук (УРАН ИПКОН РАН) Method for degassing of coal beds
CN102852546A (en) * 2011-06-30 2013-01-02 河南煤业化工集团研究院有限责任公司 Method for pre-pumping coal roadway stripe gas of single soft protruded coal seam of unexploited area

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2453705C1 (en) * 2011-01-13 2012-06-20 Учреждение Российской академии наук Институт проблем комплексного освоения недр Российской академии наук (УРАН ИПКОН РАН) Method for degassing of coal beds
CN102852546A (en) * 2011-06-30 2013-01-02 河南煤业化工集团研究院有限责任公司 Method for pre-pumping coal roadway stripe gas of single soft protruded coal seam of unexploited area
CN102852546B (en) * 2011-06-30 2015-04-29 河南煤业化工集团研究院有限责任公司 Method for pre-pumping coal roadway stripe gas of single soft protruded coal seam of unexploited area

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Effective date: 20100615