CN204299559U - A kind of multi-lateral horizontal well system - Google Patents
A kind of multi-lateral horizontal well system Download PDFInfo
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- CN204299559U CN204299559U CN201420642416.9U CN201420642416U CN204299559U CN 204299559 U CN204299559 U CN 204299559U CN 201420642416 U CN201420642416 U CN 201420642416U CN 204299559 U CN204299559 U CN 204299559U
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- 239000012466 permeate Substances 0.000 claims abstract description 9
- 238000005065 mining Methods 0.000 abstract description 25
- 239000003245 coal Substances 0.000 abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 10
- 239000008398 formation water Substances 0.000 description 23
- 238000005553 drilling Methods 0.000 description 11
- 238000010276 construction Methods 0.000 description 7
- 238000006073 displacement reaction Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 230000005484 gravity Effects 0.000 description 5
- 230000008595 infiltration Effects 0.000 description 5
- 238000001764 infiltration Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 4
- 238000011161 development Methods 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 230000000977 initiatory effect Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003204 osmotic effect Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
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Abstract
The utility model provides a kind of multi-lateral horizontal well system, this multi-lateral horizontal well system is arranged in updip stratum, multi-lateral horizontal well system comprises at least one group of horizontal well unit, horizontal well unit comprises: at least two mouthfuls of U-shaped wells, each U-shaped well comprises straight well section and coordinates straight well, and physical features residing for straight well section is higher than coordinating physical features residing for straight well; At least a bite multi-branched horizontal well, every mouthful of multi-branched horizontal well is arranged between adjacent two mouthfuls of U-shaped wells accordingly, every mouthful of multi-branched horizontal well comprises straight well section, the main borehole be connected with straight well section and to be connected with main borehole and to the branch well hole of downward-extension, the branch well hole of every mouthful of multi-branched horizontal well extends respectively to the U-shaped well be adjacent, and is directly communicated with corresponding U-shaped well or permeates and be communicated with.The horizontal well system that the utility model provides effectively can solve the problem of coal seam water mining step-down in updip bottom.
Description
Technical field
The utility model relates to coal bed gas field, in particular to a kind of multi-lateral horizontal well system.
Background technology
From the eighties in last century, along with the development of the technology such as measurement while-drilling instrument, motor and PDC drill bit, horizontal well drilling technology starts sizable application.By directional well technology straight well or inclined shaft bent target approach stratum and parallel object layer creeps into certain length, due to stratum be generally level or close to level so well in destination layer is also level or close to level, usually such well is called horizontal well.Horizontal well can be divided into single horizontal well and multi-branched horizontal well by well type; Single horizontal well can be divided into again tradition single horizontal well and be communicated with horizontal well with U-shaped; Multi-branched horizontal well has can be divided into single main multi-branched horizontal well and a two main multiple-limb level, completes order has to be divided into subdrilling branch or main of subdrilling in main split.
Coal bed gas extraction process is the process of draining, step-down, desorb and gas production.The mining of coal bed gas makes coal bed gas desorb by effective draining, reduction bottom pressure, is pooled to the process that low pressure pit shaft is discharged, usually uses multi-branched horizontal well to complete this mining process.Coal bed gas extraction process is draining, step-down, desorb, gas production, and first joint draining just determines coal bed gas horizontal well mining pump down to horizontal well minimum point, must be only had this some ability effectively draining, thus realize step-down, desorb and gas production.This just proposes requirement to horizontal well, multi-branched horizontal well drilling engineering: all branch well holes must greater than or equal to mining pump position, and the optimum position entered under mining pump is the connectivity points of landing point or the U-shaped well of near-end/far-end.That is: U-shaped well, multi-branched horizontal well are communicated with for horizontal well, near-end, must ensure to creep into along updip direction in acline or updip stratum, arrange; For the U-shaped horizontal well of far-end, must ensure to creep at acline or along the direction, stratum that has a down dip, arrange.Do guarantee so under gravity, formation water flows to mining pump position (horizontal well extreme lower position), effectively could implement the mining of coal bed gas.
Multi-branched horizontal well can more effective communication coal seam self hole fissure channel, (oil) gas area is let out in increase, Branch control aerogenesis resource area efficiency is high, can overcome " hypotonic, low pressure, low saturated " feature of coal seam reservoirs well.So multi-branched horizontal well is subject to increasing attention and utilization in cbm development.But horizontal well and multi-branched horizontal well are mainly applicable to the exploitation of thin layer and low permeability reservoir.But inclination angle is greater than to the mining of the coal bed gas in 20 ° of updip bottoms, the contradiction existed between mining difficulty and difficulty of construction because its physical features is higher, therefore the coal seam water in updip stratum effectively can not be discharged always.
Prior art is when the problem of mining step-down in updip stratum, still adopt the pattern of traditional multi-branched horizontal well, although during mining, utilize the gravity of current can obtain a good drainage effect, but the problem of this technology is when spudding in multi-branched horizontal well, hold due to updip stratum and reduce suspending weight, under frictional resistance, backing pressure effect, limiting horizontal well and be drilled with length in updip stratum.The length of frictional resistance and backing pressure and horizontal well and updip amplitude proportional, the stability of excessive drilling parameter (the pressure of the drill, suspending weight, moment of torsion etc.) destructible well is applied in order to overcome frictional resistance and backing pressure, in mechanical strength weakness easily collapses the coal seam that collapses, particularly especially easily cause the generation of borehole collapse lock of tool drilling, lead to serious loss.
Based on the problems referred to above, be necessary to propose a kind of effective multi-lateral horizontal well system, to solve the problem of coal seam water mining step-down difficulty in updip stratum.
Utility model content
The utility model aims to provide a kind of multi-lateral horizontal well system, to solve the problem of coal seam water mining step-down difficulty in updip stratum in prior art.
To achieve these goals, according to an aspect of the present invention, provide a kind of multi-lateral horizontal well system, this multi-lateral horizontal well system is arranged in updip stratum, multi-lateral horizontal well system comprises at least one group of horizontal well unit, horizontal well unit comprises: at least two mouthfuls of U-shaped wells, and each U-shaped well comprises straight well section and coordinates straight well, and physical features residing for straight well section is higher than coordinating physical features residing for straight well; At least a bite multi-branched horizontal well, every mouthful of multi-branched horizontal well is arranged between adjacent two mouthfuls of U-shaped wells accordingly, and every mouthful of multi-branched horizontal well comprises straight well section, the main borehole be connected with straight well section and to be connected with main borehole and to the branch well hole of downward-extension; The branch well hole of every mouthful of multi-branched horizontal well extends respectively to the U-shaped well be adjacent, and is directly communicated with corresponding U-shaped well or permeates and be communicated with.
Further, branch well hole permeates with U-shaped well and is communicated with, and the distance between the end of branch well hole and U-shaped well is 3 ~ 15 meters.
Further, the main borehole length of each multi-branched horizontal well is 1/3 ~ 1/2 of U-shaped well length.
Further, at least two mouthfuls of adjacent U-shaped wells in horizontal well unit, and the multi-branched horizontal well that correspondence is arranged in two mouthfuls of adjacent U-shaped wells shares a straight well section.
Further, multi-lateral horizontal well system is arranged in massif physical features, and multi-lateral horizontal well system comprises the multiple horizontal well unit be circumferentially arranged in massif physical features.
Further, the angle shared between the adjacent U-shaped well of two of a straight well section is 30 ~ 90 degree, simultaneously the main borehole of the multiple-limb level of a shared straight well section between adjacent two U-shaped wells on separated time.
Further, adjacent two multi-branched horizontal well units shareds U-shaped well in multiple horizontal well unit.
Further, in multiple horizontal well unit, each U-shaped well and each multi-branched horizontal well share a straight well section.
Further, multi-lateral horizontal well system comprises four groups of horizontal well unit.
A kind of multi-lateral horizontal well system of application the technical solution of the utility model and construction method thereof, by by least two mouthfuls of U-shaped wells and at least a bite multi-branched horizontal well be arranged in tilted stratum, and utilize the main borehole of U-shaped well to lead to multi-branched horizontal well branch well hole current the layout be connected, can water effectively in mining updip stratum, reach the object that step-down is resolved.This multi-lateral horizontal well system in use, water in updip stratum passes through the effect of mining pump and gravity, separate out from stratum and enter branch well hole from the main borehole of multi-branched horizontal well subsequently, formation water in multi-branched horizontal well by the affluent-dividing on it to adjacent U-shaped well main borehole, converge with the formation water in U-shaped well main borehole, finally discharge from the cooperation straight well of U-shaped well together.Following formation water repeats above-mentioned step, until got rid of by formation water to greatest extent, reaches the object that step-down is resolved.
Accompanying drawing explanation
The Figure of description forming a application's part is used to provide further understanding of the present utility model, and schematic description and description of the present utility model, for explaining the utility model, is not formed improper restriction of the present utility model.In the accompanying drawings:
Fig. 1 shows the multi-lateral horizontal well system schematic diagram according to the utility model embodiment.
Detailed description of the invention
Below in conjunction with the accompanying drawing of the utility model embodiment, be described in detail, it should be noted that the technical scheme in embodiment of the present utility model, when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.Below with reference to the accompanying drawings and describe the utility model in detail in conjunction with the embodiments.
Introduce as background technology part, existing in prior art in tilted stratum can not the problem of drainage and step-down effectively.In order to address this problem, the utility model provides a kind of multi-lateral horizontal well system.As shown in Figure 1, this multi-lateral horizontal well system is arranged in updip stratum, and multi-lateral horizontal well system comprises at least one group of horizontal well unit, and one group of horizontal well unit comprises:
At least two mouthfuls of U-shaped wells 4 and at least a bite multi-branched horizontal well, the U-shaped well 4 of a bite comprises straight well section 3 and coordinates straight well 2, and physical features residing for straight well section 3 is higher than coordinating physical features residing for straight well 2; A bite multi-branched horizontal well is arranged between adjacent two mouthfuls of U-shaped wells 4 accordingly, every mouthful of multi-branched horizontal well comprises straight well section 3, the main borehole be connected with straight well section 3, and to be connected with main borehole and to the branch well hole 1 of downward-extension, the branch well hole 1 of every mouthful of multi-branched horizontal well extends respectively to the U-shaped well 4 be adjacent, and is directly communicated with corresponding U-shaped well 4 or permeates and be communicated with.
The multi-lateral horizontal well system that the utility model is above-mentioned, by by least two mouthfuls of U-shaped wells 4 and at least a bite multi-branched horizontal well be arranged in tilted stratum, and utilize the main borehole of U-shaped well 4 to lead to multi-branched horizontal well branch well hole 1 current the layout be connected, can water effectively in mining updip stratum, reach the object that step-down is resolved.This multi-lateral horizontal well system in use, water in updip stratum passes through the effect of mining pump and gravity, separate out from stratum and enter branch well hole 1 from the main borehole of multi-branched horizontal well subsequently, formation water in multi-branched horizontal well by the affluent-dividing on it to adjacent U-shaped well 4 main borehole, converge with the formation water in U-shaped well 4 main borehole, finally discharge from the cooperation straight well 2 of U-shaped well 4 together.Following formation water repeats above-mentioned step, until got rid of by formation water to greatest extent, reaches the object that step-down is resolved.
And the U-shaped well 4 that the branch well hole 1 of horizontal well is adjacent directly is communicated with or infiltration is communicated with.By above-mentioned annexation, formation water can more efficiently from stratum by mining out, reach step-down object.And when in formation water, pressure is larger, the mode that horizontal well branch well hole 1 is directly communicated with adjacent U-shaped well 4 main borehole can be taked, for mining step-down provides favourable layout, and when in formation water during moderate pressure, horizontal well branch well hole 1 can be taked to permeate with adjacent U-shaped well 4 main borehole the mode be communicated with, not only can reach the effect that normal step-down is resolved, also eliminate the expense of the later maintenance to unnecessary branch well hole 1.
In a kind of ground embodiment, branch well hole 1 permeates with U-shaped well 4 and is communicated with, and the distance between the end of branch well hole 1 and U-shaped well 4 is 3 ~ 15 meters.Be 3 ~ 15 meters by branch well hole 1 end-to-end distance of multi-branched horizontal well from the distance being set to adjacent U-shaped well 4 main borehole, while the normal step-down of guarantee is resolved, can ensure that the branch well hole 1 of multi-branched horizontal well is communicated with the infiltration of adjacent U-shaped well 4 main borehole.When the end-to-end distance of the branch well hole 1 of multi-branched horizontal well is greater than 3 ~ 15 meters from the distance being set to adjacent U-shaped well 4 main borehole, formation water osmotic effect can be relatively poor, be unfavorable for the mining step-down of formation water, and when this distance is less than 3 ~ 15 meters, then can face infiltration and be communicated with the possibility becoming connection, add the maintenance cost in later stage.
In another kind of embodiment, the main borehole length of each multi-branched horizontal well is 1/3 ~ 1/2 of U-shaped well 4 length, and branch well hole 1 is arranged in the both sides of main borehole to end direction order by the initiating terminal of main borehole.By the formation water step-down analyzing efficiency that said structure can make the main borehole of U-shaped well 4 reach the highest.The main borehole length of multi-branched horizontal well is 1/3 ~ 1/2 of U-shaped well 4 length, determine the number of multi-branched horizontal well branch well hole 1, displacement in displacement now in multi-branched horizontal well branch well hole 1 and U-shaped well 4 main borehole can make the displacement of U-shaped well 4 main borehole reach U-shaped well 4 main borehole can the maximum of discharge capacity, has maximally utilised U-shaped well 4.
At least two mouthfuls of adjacent U-shaped wells 4 in horizontal well unit in a kind of embodiment of the present utility model, and the multi-branched horizontal well that correspondence is arranged in two mouthfuls of adjacent U-shaped wells 4 shares a straight well section 3.Share a straight well section 3 in a horizontal well unit and greatly reduce drilling cost, the main borehole of multi-branched horizontal well between adjacent two U-shaped wells 4 in separated time then can balance displacement between adjacent two U-shaped wells 4 and gas production, the unitized management utilizing the later stage to produce.
In another kind of embodiment, multi-lateral horizontal well system is arranged in massif physical features, and multi-lateral horizontal well system comprises the multiple horizontal well unit be circumferentially arranged in massif physical features.This kind of multi-lateral horizontal well system can make the formation water at massif physical features four sides gentle to greatest extent by mining.
The angle shared between the adjacent U-shaped well 4 of two of a straight well section 3 is 30 ~ 90 degree, simultaneously the main borehole of the multiple-limb level of a shared straight well section 3 between adjacent two U-shaped wells 4 on separated time.This kind of layout can make a horizontal well unit play maximum drainage and step-down effect and ensure that the infiltration of the branch well hole 1 of multi-branched horizontal well connects and can not be destroyed simultaneously.First, when angle between two adjacent U-shaped wells 4 is less than 30 degree, mean multi-branched horizontal well and adjacent two mouthfuls of U-shaped wells 4 from very close to, to not only reduce like this and the contact area on stratum also add pressure disturbance between multi-branched horizontal well and adjacent two mouthfuls of U-shaped well 4 threes, the risk that the main borehole that improve multi-branched horizontal well and adjacent two mouthfuls of U-shaped wells 4 subsides simultaneously.And the angle between two adjacent U-shaped wells 4 is when being greater than 90 degree, the main borehole 2 of two adjacent multi-branched horizontal wells from away from, cause in branch, touching end water speed comparatively large, improve the risk destroyed multi-branched horizontal well branch well hole 1 and be communicated with the infiltration that adjacent main props up well, secondly, in massif physical features, step-down is wanted to resolve the formation water of whole massif, need by horizontal well cell rings around the four sides of whole massif physical features, and the angle between two adjacent U-shaped wells 4 is when being less than 30 degree, then at least need 12 horizontal well unit, add construction cost greatly, and the angle between two adjacent U-shaped wells 4 is when being greater than 90 degree, then now need at most 4 horizontal well unit, although reduce construction cost, but also greatly reduce the contact area on horizontal well unit and stratum simultaneously, the complete step-down of the formation water in massif can not be made to resolve, also reduce the gas production of horizontal well unit simultaneously.
The U-shaped well 4 of adjacent two multi-branched horizontal well units shareds one in multiple horizontal well unit.In multiple horizontal well unit, each U-shaped well 4 and each multi-branched horizontal well share a straight well section 3.While guarantee mining amount, reduce drilling cost in whole massif physical features.
Above-mentioned any embodiment can be realized by the following method, one group of horizontal well unit is at least drilled through in updip stratum, the step drilling through one group of horizontal well unit comprises: drill through at least two mouthfuls of U-shaped wells 4, and makes physical features residing for the straight well section 3 of every mouthful of U-shaped well 4 higher than coordinating physical features residing for straight well 2; Drill through at least a bite multi-branched horizontal well, and make every mouthful of multi-branched horizontal well be arranged between adjacent two mouthfuls of U-shaped wells 4 accordingly, when drilling through each multi-branched horizontal well, drill through straight well section 3 respectively, the main borehole be connected with straight well section 3, and to be connected with main borehole and to the branch well hole 1 of downward-extension, and the branch well hole 1 of every mouthful of multi-branched horizontal well is extended respectively to the U-shaped well 4 be adjacent, and be directly communicated with corresponding U-shaped well 4 or permeate and be communicated with.
The effect of mining pump and gravity is passed through by the water in this boring method updip stratum, separate out from stratum and enter branch well hole 1 from the main borehole of multi-branched horizontal well subsequently, formation water in multi-branched horizontal well by the affluent-dividing on it to adjacent U-shaped well 4 main borehole, converge with the formation water in U-shaped well 4 main borehole, finally discharge from the cooperation straight well 2 of U-shaped well 4 together.Following formation water repeats above-mentioned step, until got rid of by formation water to greatest extent, reaches the object that step-down is resolved.
In a kind of embodiment, the step drilling through multi-lateral horizontal well system in massif physical features comprises: S1, one group of cooperation straight well 2 around the arrangement of massif physical features is set at the relative low points of massif physical features, and one group of straight well section 3 around the arrangement of massif physical features is set at the relatively high point of massif physical features; S2, drills through one group of U-shaped well 4, and each U-shaped well 4 is communicated with a straight well section 3 and a fit diameter respectively; S3, drills through a bite multi-branched horizontal well between every two adjacent two U-shaped wells 4, and in each multi-branched horizontal well, branch well hole 1 extends downward be connected logical with U-shaped well 4 current be adjacent.The multi-lateral horizontal well system that this kind of construction method drills through can make the formation water at massif physical features four sides gentle to greatest extent by mining.
In step S1, arrange a straight well section 3 in the commanding elevation of massif physical features, in step S3, each multi-branched horizontal well and each U-shaped well 4 share a straight well section 3.This kind of construction method can reduce drilling cost effectively.In addition in step S3, during each multi-branched horizontal well, drill through in the process of main borehole, drill through branch well hole 1 to both sides simultaneously, the main borehole length of each multi-branched horizontal well is 1/3 ~ 1/2 of U-shaped well 4 length, and branch well hole 1 is arranged in the both sides of main borehole to end direction order by the initiating terminal of main borehole.This construction method determines the number of multi-branched horizontal well branch well hole 1, displacement in displacement now in multi-branched horizontal well branch well hole 1 and U-shaped well 4 main borehole can make the displacement of U-shaped well 4 main borehole reach U-shaped well 4 main borehole can the maximum of discharge capacity, has maximally utilised U-shaped well 4.
The foregoing is only embodiment of the present utility model, be not limited to the utility model, for a person skilled in the art, the utility model can have various modifications and variations.All within spirit of the present utility model and principle, any amendment done, equivalent replacement, improvement etc., all should be included within protection domain of the present utility model.
Claims (9)
1. a multi-lateral horizontal well system, described multi-lateral horizontal well system is arranged in tilted stratum, it is characterized in that, described multi-lateral horizontal well system comprises at least one group of horizontal well unit, and described horizontal well unit comprises:
At least two mouthfuls of U-shaped wells, each described U-shaped well comprises straight well section (3) and coordinates straight well (2), and the residing physical features of described straight well section (3) is higher than the residing physical features of described cooperation straight well (2);
At least a bite multi-branched horizontal well, every mouthful of described multi-branched horizontal well is arranged between adjacent two mouthfuls of U-shaped wells (4) accordingly, and every mouthful of described multi-branched horizontal well comprises straight well section (3), the main borehole be connected with described straight well section (3) and to be connected with described main borehole and to the branch well hole (1) of downward-extension;
The branch well hole (1) of every mouthful of described multi-branched horizontal well extends respectively to the U-shaped well (4) be adjacent, and is directly communicated with corresponding U-shaped well (4) or permeates and be communicated with.
2. multi-lateral horizontal well system according to claim 1, it is characterized in that, described branch well hole (1) permeates with described U-shaped well and is communicated with, and the distance between the end of described branch well hole (1) and described U-shaped well (4) is 3 ~ 15 meters.
3. multi-lateral horizontal well system according to claim 1, is characterized in that, the main borehole length of each described multi-branched horizontal well is 1/3 ~ 1/2 of described U-shaped well (4) length.
4. multi-lateral horizontal well system according to claim 1, it is characterized in that, at least two mouthfuls of adjacent U-shaped wells (4) in described horizontal well unit, and the multi-branched horizontal well that correspondence is arranged in two mouthfuls of adjacent U-shaped wells (4) shares a straight well section (3).
5. multi-lateral horizontal well system according to claim 4, is characterized in that, described multi-lateral horizontal well system is arranged in massif physical features, and described multi-lateral horizontal well system comprises the multiple described horizontal well unit be circumferentially arranged in described massif physical features.
6. multi-lateral horizontal well system according to claim 5, it is characterized in that, the angle shared between the adjacent U-shaped well (4) of two of a straight well section (3) is 30 ~ 90 degree, and preferably the main borehole of the described multiple-limb level of a shared straight well section (3) is arranged on the separated time between adjacent two described U-shaped wells (4) simultaneously.
7. multi-lateral horizontal well system according to claim 6, is characterized in that, adjacent two multi-branched horizontal well units shareds U-shaped well (4) in multiple described horizontal well unit.
8. multi-lateral horizontal well system according to claim 7, is characterized in that, in multiple described horizontal well unit, each described U-shaped well (4) and each described multi-branched horizontal well share a straight well section (3).
9. multi-lateral horizontal well system according to claim 8, is characterized in that, described multi-lateral horizontal well system comprises horizontal well unit described in four groups.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201420642416.9U CN204299559U (en) | 2014-10-30 | 2014-10-30 | A kind of multi-lateral horizontal well system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420642416.9U CN204299559U (en) | 2014-10-30 | 2014-10-30 | A kind of multi-lateral horizontal well system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104453832A (en) * | 2014-10-30 | 2015-03-25 | 北京奥瑞安能源技术开发有限公司 | Multi-branch horizontal well system and construction method thereof |
| CN107083947A (en) * | 2017-05-23 | 2017-08-22 | 中国神华能源股份有限公司 | The gang of wells and its process for constructing of synchronous extraction coal bed gas up and down |
| CN111520119A (en) * | 2020-04-28 | 2020-08-11 | 中煤科工集团西安研究院有限公司 | Method for efficiently extracting coal bed gas by staged fracturing of large-spacing thin coal seam group multi-bottom horizontal well |
| CN112593910A (en) * | 2020-12-10 | 2021-04-02 | 山西晋城无烟煤矿业集团有限责任公司 | Efficient mining method for broken low-permeability coal bed gas short horizontal well group |
-
2014
- 2014-10-30 CN CN201420642416.9U patent/CN204299559U/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104453832A (en) * | 2014-10-30 | 2015-03-25 | 北京奥瑞安能源技术开发有限公司 | Multi-branch horizontal well system and construction method thereof |
| CN104453832B (en) * | 2014-10-30 | 2018-04-06 | 北京奥瑞安能源技术开发有限公司 | A kind of multi-lateral horizontal well system and its construction method |
| CN107083947A (en) * | 2017-05-23 | 2017-08-22 | 中国神华能源股份有限公司 | The gang of wells and its process for constructing of synchronous extraction coal bed gas up and down |
| CN107083947B (en) * | 2017-05-23 | 2020-05-01 | 中国神华能源股份有限公司 | Well group for extracting coal bed gas synchronously from top and bottom and construction method thereof |
| CN111520119A (en) * | 2020-04-28 | 2020-08-11 | 中煤科工集团西安研究院有限公司 | Method for efficiently extracting coal bed gas by staged fracturing of large-spacing thin coal seam group multi-bottom horizontal well |
| CN111520119B (en) * | 2020-04-28 | 2022-04-08 | 中煤科工集团西安研究院有限公司 | Method for efficiently extracting coal bed gas by staged fracturing of large-spacing thin coal seam group multi-bottom horizontal well |
| CN112593910A (en) * | 2020-12-10 | 2021-04-02 | 山西晋城无烟煤矿业集团有限责任公司 | Efficient mining method for broken low-permeability coal bed gas short horizontal well group |
| CN112593910B (en) * | 2020-12-10 | 2022-11-11 | 山西晋城无烟煤矿业集团有限责任公司 | Efficient mining method for broken low-permeability coal bed gas short horizontal well group |
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