CN202064928U - Coal-bed gas multi-branch horizontal well system - Google Patents
Coal-bed gas multi-branch horizontal well system Download PDFInfo
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- CN202064928U CN202064928U CN2011201785345U CN201120178534U CN202064928U CN 202064928 U CN202064928 U CN 202064928U CN 2011201785345 U CN2011201785345 U CN 2011201785345U CN 201120178534 U CN201120178534 U CN 201120178534U CN 202064928 U CN202064928 U CN 202064928U
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Abstract
The utility model discloses a coal-bed gas multi-branch horizontal well system which comprises a horizontal well, wherein the horizontal well comprises a straight well section, a building angle section and a horizontal section which are sequentially connected; the horizontal section comprises a main borehole, and a supporting pipe with permeability is arranged in the main borehole. In the utility model, the multi-branch horizontal well system is provided with the supporting pipe with permeability at the horizontal section of the horizontal well to enhance the stability of a supported borehole, the supporting pipe is provided with a washing channel for washing the borehole or unplugging the pipe in the subsequent gas production process; meanwhile, through the supporting pipe with permeability, hydraulic jetting, fracturing and other means are not needed to increase the pore passages in the reservoir bed to keep the geological fluid in the reservoir bed near the main borehole stably flowing into the supporting pipe, and the additional production cost caused by hydraulic jetting or fracturing is avoided.
Description
Technical field
The utility model relates to the coal-bed gas exploitation field, especially relates to a kind of coal bed gas multi-branched horizontal well system.
Background technology
In the coal-bed gas exploitation historical progress,, successively pass through straight well pattern, horizontal well pattern and U-shaped well formula horizontal well pattern in order to increase the output of coal bed gas.
Wherein, the straight well pattern includes only a straight well, carries out drainage and step-down and gas production by this straight well; This straight well pattern or carry out seepage flow by the cave that is connected on the straight well, otherwise realizing linking up with the coal seam by the pressure break pattern produces seepage flow, and however, present production efficiency is generally not high.
The horizontal well pattern is the improvement to the straight well pattern, it row who comprises a horizontal well and corresponding connection with it adopts straight well, horizontal well generally includes and is parallel to the straight well section that straight well extends downwards, obliquely from the lower end of straight well section extend down the inclination section that is connected with the connection cave of straight well, from being communicated with the cave along horizontal segment away from the direction extension preset distance of inclination section, this horizontal well pattern is to adopt straight well by the row who is attached thereto to come drainage and step-down and gas production; The horizontal well pattern has increased the seepage area in coal seam by drill through horizontal segment in the coal seam, has improved production efficiency.In order further to increase seepage area, the horizontal well horizontal segment is become the multi-branched horizontal well pattern that comprises that main borehole and the branch well hole that is connected the main borehole both sides form by the single branch horizontal well pattern that only comprises main borehole.In the development process of coal bed gas, in order further to increase production capacity, except above-mentioned engineering means, thereby the duct that also can adopt means such as jetting, pressure break to increase reservoir usually increases the percolation ability of reservoir.
The purpose that is substituted to the multi-branched horizontal well pattern by the straight well pattern is by increasing the leakage area mode of reservoir, increasing the output of coal bed gas.But revealing the area mode, this increase reservoir increased stratum operation, because stratum itself is also unstable, even adopting the mode of steady step-down exploits, also be difficult to avoid the phenomenon of blocking of caving in each well of horizontal segment, phenomenon of blocking will be dwindled productive area in case occur caving in, particularly when main borehole was blocked, the exploitation effect of this multi-branched horizontal well pattern was just compared with straight well and is lost ground.
When the situation of obstruction occurring for the horizontal segment well, prior art usually adopts carrying out pressure break near the cave or runner is dredged in jetting, but these mediation modes just adopt preventive measure or carry out provisional local cleaning for the position, cave, and the passage of the maintenance horizontal well horizontal segment well that it can't be lasting is unimpeded.
Also have a kind of U-shaped well pattern in the prior art, the row that this U-shaped well pattern has a horizontal well and is mated use adopts straight well, and row adopts the end that straight well is arranged on horizontal well.The relative straight well pattern of this U-shaped well pattern has increased its reservoir seepage area, and still compare reservoir leakage area with the multi-branched horizontal well pattern relative less.How when increasing reservoir and revealing area, guarantee the stability of coal-bed gas exploitation and between the productive life cleaning of well be the major issue of coal-bed gas exploitation with cleaning, it is imperative to seek a kind of new recovery well pattern.
The utility model content
The utility model purpose is to overcome the prior art deficiency, and a kind of multi-branched horizontal well system is provided, and it has, and exploitation is stable, the characteristics of well capable of washing.
For this reason, provide a kind of multi-branched horizontal well system in the utility model, comprised horizontal well, horizontal well comprises straight well section, inclination section and the horizontal segment that links to each other successively, and horizontal segment comprises a main borehole, is provided with in the main borehole to have infiltrative pillar.
Further, above-mentioned have a tail end that infiltrative pillar first end extends to the horizontal segment main borehole, and second end flushes or extends in the inclination section at least with straight well section well head.
Further, when second end with infiltrative pillar extended in the inclination section, the port of second end of this pillar had the tapered structure that expands outwardly, and the diameter of the port outer end of this second end and the internal diameter of inclination section are complementary.
Further, have many group through holes on the tube wall of above-mentioned pillar, the wall thickness of a pillar is 5～15mm, and diameter is Φ 100～Φ 120mm.
Further, above-mentioned through hole is circular port or key-way shape hole.
Further, the above-mentioned axial setting of respectively organizing through hole along a pillar, the distance between the two adjacent groups through hole is 60～150mm.
Further, in above-mentioned every group of through hole, each through hole is around the circumferential setting of a pillar, and the spacing of adjacent two through hole is 60～120mm.
Further, in the above-mentioned two adjacent groups through hole, each through hole is staggered.
Further, above-mentioned first branch well hole that also comprises, first branch well hole is connected on the main borehole.
Further, above-mentioned second branch well hole that also comprises, second branch well hole is connected on first branch well hole.
The beneficial effects of the utility model: multi-branched horizontal well provided by the utility model system has the stability that infiltrative pillar strengthened institute's supporting well by being lowered at the horizontal well horizontal segment, this pillar also provides a kind of flushing channel, is implemented in the cleaning well in the follow-up gas production process or removes the interior obstruction of pipe; Simultaneously, by infiltrative the pillar that have that is lowered to, the duct that need not to adopt means such as jetting, pressure break to increase reservoir just can keep stable the flowing into of geologic fluids near the reservoir of main borehole to prop up in the pillar, has avoided adopting jetting mode or the extra cost of production of pressure break mode.
Except purpose described above, feature and advantage, the utility model also has other purpose, feature and advantage.With reference to figure, the utility model is described in further detail below.
Description of drawings
Accompanying drawing constitute this manual a part, be used for further understanding the utility model, accompanying drawing shows preferred embodiment of the present utility model, and is used for illustrating principle of the present utility model with manual.Among the figure:
Fig. 1 shows the multi-branched horizontal well system architecture schematic diagram according to a kind of embodiment of the utility model
Fig. 2 shows the multi-branched horizontal well system architecture schematic diagram according to the another kind of embodiment of the utility model;
Fig. 3 shows first kind of structure for amplifying schematic diagram at A place among Fig. 1; And
Fig. 4 shows second kind of structure for amplifying schematic diagram at A place among Fig. 1.
The specific embodiment
Below in conjunction with the accompanying drawing among the utility model embodiment, technical scheme among the embodiment of the present utility model is described in detail, but following embodiment and accompanying drawing only are in order to understand the utility model, and can not limit the utility model, the multitude of different ways that the utility model can be defined by the claims and cover is implemented.
Fig. 1 shows the multi-branched horizontal well system architecture schematic diagram according to the utility model embodiment, as shown in Figure 1, in a kind of exemplary embodiment of the present utility model, this multi-branched horizontal well system, comprise horizontal well 10 and exploitation straight well 20, wherein, horizontal well 10 comprises straight well section 11, inclination section 13 and the horizontal segment 15 that links to each other successively, and inclination section 13 and horizontal segment 15 are connected to the both sides in the connection cave 21 of exploitation straight well 20.Horizontal segment 15 has a main borehole 17, is provided with in the main borehole to have infiltrative pillar 30.Having infiltrative pillar 30 and can employing itself have the prepared tubing of material of infiltration function in the utility model, also can be to make it have permeability by make hole on tubing.Multi-branched horizontal well provided by the utility model system has the stability that infiltrative pillar strengthened institute's supporting well by being lowered at the horizontal well horizontal segment, this pillar also provides a kind of flushing channel, is implemented in the cleaning well in the follow-up gas production process or removes the interior obstruction of pipe; Simultaneously, by infiltrative the pillar that have that is lowered to, the duct that need not to adopt means such as jetting, pressure break to increase reservoir just can keep stable the flowing into of geologic fluids near the reservoir of main borehole to prop up in the pillar, has avoided adopting jetting mode or the extra cost of production of pressure break mode.
When adopting the utility model multi-branched horizontal well system exploiting coal bed methane, even the short grained formation material of part flow in the pillar 30, stop up a pillar 30 through piling up the back, also can simply wash and then dredge a pillar 30 to the deposit in the pillar 30 by in a pillar 30, being lowered to cleaning hose, applying current with certain pressure.Owing to be that cleaning hose is lowered in the pillar 30, not only can solve pillar 30 blocking problem, and can not break the earth formation of meeting main borehole, this long-term stability that has just guaranteed the utility model multi-branched horizontal well system is used.
By illustrated in figures 1 and 2, preferably, above-mentioned have a tail end that infiltrative pillar 30 first ends extend to horizontal segment 15 main boreholes 17, and second end flushes (as shown in Figure 1) with straight well section well head or extends at least in the inclination section 13 (as shown in Figure 2).Wherein when second end with infiltrative pillar 30 extended in the inclination section 13, the port of second end of this pillar 30 had the tapered structure that expands outwardly, and the diameter of the port outer end of this second end and the internal diameter of inclination section 13 are complementary.To prop up pillar 30 and be arranged to said structure, and can be convenient in a pillar, be lowered to cleaning hose.
As shown in Figure 3, in a kind of concrete embodiment of the present utility model, a pillar 30 is for having the flexible pipes of many group through holes 31 in the above-mentioned multi-branched horizontal well system on the tube wall.This how group through holes 31 make the supporting pipe have infiltrative scheme by being provided with on tube wall, have increased the optional scope that the utility model props up pillar, and optionally the flexible pipe as a pillar includes but not limited to tubing such as PE, PVC, PP.Simultaneously, a this raw-material relative low price of pillar with many group through holes 31, manufacture craft is simple, for the construction of multi-branched horizontal well system has reduced cost.Preferably, the wall thickness of above-mentioned flexible pipe is 5～15mm, the blocked up intensity that can increase the flexible pipe tube wall of the tube wall of flexible pipe, reduce the bendable folding endurance of flexible pipe, the tube wall of flexible pipe is crossed the thin intensity that can reduce the flexible pipe tube wall, make the flexible pipe tube wall too soft, these all are unfavorable for flexible pipe is lowered in the main borehole 17 of horizontal well.In addition, in the coal-bed gas exploitation process, geologic structure is also unstable, if the flexible pipe tube wall is thin excessively, reduces the intensity of tube wall, in case geologic structure changes, is easy to oppress tube wall and causes distortion, and stop up a pillar, is unfavorable for the exploitation of coal bed gas.
Preferably, the internal diameter of above-mentioned flexible pipe is Φ 100mm～Φ 120mm.The diameter of flexible pipe is complementary with the internal diameter of the main borehole that is drilled through in the utility model, the internal diameter of flexible pipe is controlled in Φ 100mm～Φ 120mm scope, in this scope, help realizing in a pillar, being lowered to cleaning hose, and then clean the foreign material such as ickings in the pillar.
Through hole 31 in the utility model on above-mentioned pillar 30 can have arbitrary shape, as long as guaranteeing that a pillar 30 has enough intensity, helps the inside that geologic fluids flow into a pillar simultaneously and gets final product.
Preferably, as shown in Figure 3, the through hole 31 that is provided with on above-mentioned pillar is circular port, and its aperture is 8～15mm.The aperture of through hole is arranged in this scope, can be when helping the inside that geologic fluids flow into pillar, avoid bulky grain in the geologic structure to flow into inner obstruction of a pillar and prop up a pillar with fluid.
In a kind of concrete embodiment of the present utility model, respectively organize the axial setting of through hole 31 on above-mentioned the pillar 30 along a pillar 30, the spacing between the two adjacent groups through hole 31 is 40mm～100mm.In this scheme, through hole 31 groupings are arranged on the pillar 30 vertically, make through hole 31 be evenly distributed on whole the pillar 30, are convenient to the exploitation to coal bed gas in the whole main borehole institute area coverage.Spacing between two groups of through holes 31 is controlled at 60mm～150mm, can has on the basis of enough support strengths, guarantee the quantity of through hole, and then guarantee amount by the geologic fluids of the inboard infiltration in a pillar lateral at the tube wall that guarantees a pillar.
Preferably, in above-mentioned every group of through hole 31, each through hole 31 is around the circumferential setting of a pillar, and the spacing of adjacent two through hole 31 is 60mm～120mm.In the utility model, circumferentially be meant perpendicular to the supporting tubular axis to the periphery in cross section, each through hole 31 is that center circumferential is arranged with the axial line of a pillar 30 in every group of through hole.Spacing between the adjacent through-holes 31 is controlled at 60mm～120mm, can have on the basis of enough support strengths at the tube wall that guarantees a pillar, guarantees the quantity of through hole, and then guarantees the amount by the geologic fluids of the inboard infiltration in a pillar lateral.
As shown in Figure 4, in another kind of optimal way of the present utility model, the through hole 31 that is provided with on above-mentioned pillar 30 be the key-way shape hole, and this key-way shape hole is along the axial setting of propping up pillar 30, and its axial length is 25-35mm, and aperture is 8-12mm.Preferably, when adopting in this key-way shape hole, comprise 4 key-way shape holes in every group of through hole, along circumferentially arranging equably of a pillar 30, the spacing of the two groups of through holes 31 that link to each other is 60mm～150mm.
In a kind of concrete embodiment of the present utility model, also comprise first branch well hole 18 in the above-mentioned multi-branched horizontal well system, first branch well hole 18 is connected on the main borehole 17.The setting of first branch well hole is in order to increase the leakage area of reservoir, and then increases the output of coal bed gas.Wherein first branch well hole 18 can be many, is distributed in the both sides of main borehole 17 respectively, can become the vein mode to arrange.To the initiating terminal direction, the angle between first branch and the main shaft canthus increases progressively in the scope of 30-55 degree from the end of main borehole, evenly distributes about 100--200 rice in the side tracking point spacing of first adjacent on the main borehole 17 branch well hole.
Preferably, comprise that also second branch well hole, 19, the second branch well holes 19 are connected on first branch well hole 18 in the above-mentioned multi-branched horizontal well system.Second branch well hole be provided with the leakage area that is beneficial to further increase reservoir, and then increase the output of coal bed gas.Preferably, second branch well hole 19 can be to follow more, is distributed in the both sides of first branch well hole 18 respectively.Distance between second branch well hole 19 and the adjacent wellbores all is not less than 50m.
In a kind of exemplary embodiment of the present utility model, the job practices of a kind of multi-branched horizontal well system also is provided, in the present embodiment, comprise the steps: one, because the horizontal well 10 that is drilled with need be adopted straight well 20 with row is communicated with, straight well 20 is adopted by the row of being drilled with earlier.And, because horizontal well 10 wells need adopt straight well 20 with row and is communicated with at 21 places, cave that row adopts in the straight well 20, so need make connection cave 21 in the position that row adopts destination layer in the straight well 20.Two, after determining to be communicated with the position in cave 21, order drills through straight well section 11, inclination section 13 and the horizontal segment 15 of horizontal well.Inclination section 13 and horizontal segment 15 are connected with the cave 21 that row adopts straight well 20.Three, will have infiltrative pillar is lowered in the main borehole of horizontal well by the well head of straight well section 11.Multi-branched horizontal well provided by the utility model system has the stability that infiltrative pillar strengthened institute's supporting well by being lowered at the horizontal well horizontal segment, this pillar also provides a kind of flushing channel, is implemented in the cleaning well in the follow-up gas production process or removes the interior obstruction of pipe; Simultaneously, by infiltrative the pillar that have that is lowered to, the duct that need not to adopt means such as jetting, pressure break to increase reservoir just can keep stable the flowing into of geologic fluids near the reservoir of main borehole to prop up in the pillar, has avoided adopting jetting mode or the extra cost of production of pressure break mode.
To have infiltrative pillar and be lowered to by the well head of straight well section 11 in the process in the main borehole 17 of horizontal well 15 above-mentioned, have infiltrative pillar 30 first ends and extend to the tail end of horizontal segment 15 main boreholes 17, second end flushes or extends at least in the inclination section 13 with straight well section well head.Wherein when second end with infiltrative pillar 30 extends in the inclination section 13, the port of second end of this pillar 30 has the tapered structure that expands outwardly, the port outer end of this second end and the internal diameter of inclination section 13 are complementary, so that be lowered to cleaning hose in the later stage recovery process.
In drilling through the step of horizontal well horizontal segment, above-mentioned steps two further comprises the steps; Use drilling tool to drill through main borehole 17 to direction away from inclination section 13 along the connection cave 21 that row adopts straight well 20; In the process that drills through main borehole 17, the direction that drills through that departs from main borehole 17 in the precalculated position drills through first branch well hole 18; After finishing the drilling through of first branch well hole 18, return to drilling through of former main borehole 17 and continue to drill through main borehole 17 on the direction; After finishing the drilling through of main borehole 17, the drill through passage of drilling tool along main borehole 17 withdrawed from.In the work progress of multi-branched horizontal well provided by the utility model, main borehole has only one, the radical of first branch well hole 18 for following more, it is distributed in the both sides of main borehole 17, in drilling process, from the initiating terminal of main borehole 17 to the terminal direction, when drilling through main borehole 17, on the precalculated position, bore many first branch well holes 18 successively, after drilling through of horizontal segment finished in final assurance, drilling tool is arranged in the passage of main borehole, and be withdrawn into the outside of horizontal well by the passage of main borehole, and adopt this job practices, can strengthen and will have infiltrative pillar and be lowered into the unimpeded of main borehole 17 passages in main borehole 17 processes.
The step that drills through first branch well hole in the above-mentioned step that drills through the horizontal well horizontal segment further comprises: drilling through in the process of first branch well hole 18, the direction that drills through that departs from first branch well hole 18 in the precalculated position drills through second branch well hole 19.The drilling operation of second branch well hole 19 does not have specific (special) requirements, and it can be to drill through second branch well hole 19 in the process that drills through first branch well hole 18, also can be after finishing first branch well hole 18, drills through in the process that drilling tool is returned to main borehole 17.
Be lowered in the process of main borehole 17 will propping up pillar 30, along with going deep into of a pillar 30, the required power that applies is just big more on a pillar 30, in a kind of specific embodiment of the present utility model, can water booster system be set at the horizontal well well head, a pillar 30 be applied suitable external force, will have infiltrative pillar 30 and be lowered in the main borehole 17 of horizontal segment 15 by water booster system, wherein, downforce is controlled in 2 tons the scope.
Be preferred embodiment of the present utility model only below, be not limited to the utility model, for a person skilled in the art, the utility model can have various changes and variation.All within spirit of the present utility model and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within the protection domain of the present utility model.
Claims (10)
1. coal bed gas multi-branched horizontal well system, it is characterized in that, comprise horizontal well (10), described horizontal well (10) comprises straight well section (11), inclination section (13) and the horizontal segment (15) that links to each other successively, described horizontal segment (15) comprises a main borehole (17), is provided with in the described main borehole (17) to have infiltrative pillar (30).
2. multi-branched horizontal well according to claim 1 system, it is characterized in that, described pillar (30) first ends extend to the tail end of the described main borehole (17) of described horizontal segment (15), and second end flushes or extends at least in the described inclination section (13) with the well head of described straight well section (11).
3. multi-branched horizontal well according to claim 2 system, it is characterized in that, when described second end with infiltrative pillar (30) extends in the described inclination section (13), the port of second end of described pillar (30) has the tapered structure that expands outwardly, and the internal diameter of the diameter of the port outer end of described second end and inclination section (13) is complementary.
4. multi-branched horizontal well according to claim 1 system is characterized in that, has many group through holes (31) on the tube wall of described pillar (30), and the wall thickness of described pillar (30) is 5～15mm, and diameter is Φ 100～Φ 120mm.
5. multi-branched horizontal well according to claim 4 system is characterized in that each described through hole (31) is circular port or key-way shape hole.
6. multi-branched horizontal well according to claim 5 system is characterized in that each organizes the axial setting of described through hole (31) along described pillar (30), and the distance between the described through hole of two adjacent groups (31) is 60mm～150mm.
7. multi-branched horizontal well according to claim 5 system is characterized in that in every group of described through hole (31), each described through hole (31) is around the circumferential setting of described pillar (30), and the spacing of adjacent described through hole (31) is 60mm～120mm.
8. multi-branched horizontal well according to claim 5 system is characterized in that the described through hole of two adjacent groups (31) is staggered.
9. multi-branched horizontal well according to claim 1 system is characterized in that also comprise first branch well hole (18), described first branch well hole (18) is connected on the described main borehole (17).
10. multi-branched horizontal well according to claim 9 system is characterized in that also comprise second branch well hole (19), described second branch well hole (19) is connected on described first branch well hole (18).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201785345U CN202064928U (en) | 2011-05-30 | 2011-05-30 | Coal-bed gas multi-branch horizontal well system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201785345U CN202064928U (en) | 2011-05-30 | 2011-05-30 | Coal-bed gas multi-branch horizontal well system |
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| CN202064928U true CN202064928U (en) | 2011-12-07 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102322252A (en) * | 2011-05-30 | 2012-01-18 | 北京奥瑞安能源技术开发有限公司 | Coal bed gas multi-branched horizontal well system and job practices thereof |
| CN102425397A (en) * | 2011-12-29 | 2012-04-25 | 郑州大学 | Method for exploiting coal-bed methane by utilizing water force of horizontal pinnate well of double well-shaft to scour, drill and relieve pressure |
| CN102852490A (en) * | 2012-09-07 | 2013-01-02 | 北京九尊能源技术股份有限公司 | High gas suction and discharge process method for complex well |
| CN102979498A (en) * | 2012-11-12 | 2013-03-20 | 中国石油天然气股份有限公司 | Coal-bed gas multi-branch horizontal-well system |
| CN103924937A (en) * | 2013-09-11 | 2014-07-16 | 华北石油管理局 | Well washing operation method for coal-bed gas multi-branch horizontal wells |
| CN104018820A (en) * | 2014-06-16 | 2014-09-03 | 北京中矿科能煤炭地下气化技术研究中心 | Coal underground gasification process system |
| CN106930733A (en) * | 2017-05-10 | 2017-07-07 | 中国神华能源股份有限公司 | Coal bed gas group wells extraction system and method for construction |
-
2011
- 2011-05-30 CN CN2011201785345U patent/CN202064928U/en not_active Expired - Lifetime
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102322252A (en) * | 2011-05-30 | 2012-01-18 | 北京奥瑞安能源技术开发有限公司 | Coal bed gas multi-branched horizontal well system and job practices thereof |
| CN102425397A (en) * | 2011-12-29 | 2012-04-25 | 郑州大学 | Method for exploiting coal-bed methane by utilizing water force of horizontal pinnate well of double well-shaft to scour, drill and relieve pressure |
| CN102852490A (en) * | 2012-09-07 | 2013-01-02 | 北京九尊能源技术股份有限公司 | High gas suction and discharge process method for complex well |
| CN102979498A (en) * | 2012-11-12 | 2013-03-20 | 中国石油天然气股份有限公司 | Coal-bed gas multi-branch horizontal-well system |
| CN102979498B (en) * | 2012-11-12 | 2016-01-20 | 中国石油天然气股份有限公司 | A kind of multi-lateral horizontal well system for coal bed gas |
| CN103924937A (en) * | 2013-09-11 | 2014-07-16 | 华北石油管理局 | Well washing operation method for coal-bed gas multi-branch horizontal wells |
| CN104018820A (en) * | 2014-06-16 | 2014-09-03 | 北京中矿科能煤炭地下气化技术研究中心 | Coal underground gasification process system |
| CN104018820B (en) * | 2014-06-16 | 2017-01-04 | 北京中矿科能煤炭地下气化技术研究中心 | A kind of coal underground gasifying technology system |
| CN106930733A (en) * | 2017-05-10 | 2017-07-07 | 中国神华能源股份有限公司 | Coal bed gas group wells extraction system and method for construction |
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Granted publication date: 20111207 |