CN101949284A - Coalbed methane horizontal well system and construction method thereof - Google Patents
Coalbed methane horizontal well system and construction method thereof Download PDFInfo
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Abstract
The invention discloses a coalbed methane horizontal well system, which comprises a plurality of multi-branch horizontal wells, and a plurality of matched straight wells matched for use with each multi-branch horizontal well respectively, wherein each multi-branch horizontal well comprises a straight well section; and the straight well section of one multi-branch horizontal well is downwards extended to form the matched straight well of another multi-branch horizontal well. As the straight well section of one multi-branch horizontal well is used as the matched straight well of another multi-branch horizontal well, the coalbed methane horizontal well system of the invention effectively improves the utilization rate of a space, more effectively utilizes resources, reduces the construction work of the ground prespud operation of the horizontal wells and drilling construction work and saves the cost. Simultaneously, the invention also provides a construction method for the horizontal well system. The method has the advantages of simplicity, practicability, convenient execution and capability of rationally utilizing the resources and saving the cost.
Description
Technical field
The present invention relates to underground fluid resource exploitation field, relate to a kind of coal bed gas horizontal well system and job practices thereof particularly.
Background technology
In the existing underground fluid resource exploitation, such as in the exploitation of coal bed gas brill recovery well such as multi-branched horizontal well, single horizontal well, the drilling well of U type well all be that to join with a straight well be an engineering.
All comprise the steps: in the drilling process of multi-branched horizontal well select location bore a straight well 2 ', the coal seam section of straight well 2 ' correspondence is lowered to unusual casing, be generally glass reinforced plastic sleeve, after the well cementation, in corresponding coal seam section, glass reinforced plastic sleeve sliced off spills target coal seam, carry out reaming hole, form be communicated with cave 21 '.With the straight well section 11 of the straight well 2 ' preset distance place horizontal well drilling of being separated by ', inclination section 13 ', with straight well 2 ' connection cave 21 ' communicate, inclination section 13 ' bearing of trend on continue to bore the horizontal segment 15 of multi-branched horizontal well ' in the drilling well of each well.U type well comprises the straight well section, and inclination section with horizontal segment, is provided with one at the end of horizontal segment and cooperates straight well.With regard to finishing drilling, barefoot completion, straight well are lowered to special working string to U type well, and the straight well pocket is cleaned after being communicated with, tubing string is adopted by the row of being lowered to and pump draws water, step-down, until last coal output layer gas.
As shown in Figure 1, existing coal bed gas horizontal well adopt the corresponding straight well of a multi-branched horizontal well be provided with 2 ', for this multi-branched horizontal well, its straight well section 11 ' and inclination section 13 ' function a passage of horizontal segment 15 ' provide to the drilling tool horizontal well drilling is provided, after the drilling well of finishing multi-branched horizontal well, utilize the straight well 2 ' coal bed gas in the multi-branched horizontal well is exploited, and this moment multi-branched horizontal well straight well section 11 ' and inclination section 13 ' just by idle.So not only make production zone the exploitation blind area occur, simultaneously, straight well section and inclination section that a large amount of labour's material resources of this process are bored do not obtain good application.
As shown in Figure 2, in order better to improve space availability ratio, and utilize resource fully, occur in the prior art recycling the straight well section 11 of a multi-branched horizontal well ', by feeding the sleeve pipe cutting, modes such as cementing plug sidetracking, it is corresponding to finish a plurality of horizontal wells and a plurality of straight well 2 ' one by one on every side, though this kind method has improved space availability ratio to a certain extent, also improved resource utilization, yet, since a plurality of multi-branched horizontal wells be distributed in simultaneously the straight well section around, need calculate the OK range of average angle of the distribution of each multi-branched horizontal well for control area, to this straight well arrangement requirement than higher, be unfavorable for construction, and recycle the straight well section of a multi-branched horizontal well, in drilling process, break down easily, there is hidden danger, and is not suitable for large-scale construction.
Summary of the invention
The object of the invention is to provide a kind of coal bed gas horizontal well system, can make full use of resource, reduces and drops into, and can improve space availability ratio more rationally and effectively.
For this reason, the invention provides a kind of coal bed gas horizontal well system, comprise a plurality of multi-branched horizontal wells, and a plurality ofly cooperate straight well with each multi-branched horizontal well is used respectively, wherein, multi-branched horizontal well comprises the straight well section, and the straight well section of one of them multi-branched horizontal well extends to form the cooperation straight well of another multi-branched horizontal well downwards.
Further, each multi-branched horizontal well is arranged in regular turn, and the straight well section of last multi-branched horizontal well extends to form the cooperation straight well of back one multi-branched horizontal well downwards.
Further, comprise many group multi-branched horizontal well groups, comprise two two multi-branched horizontal wells that extend towards rightabout in every group of multi-branched horizontal well group, and each straight well section extends to form the cooperation straight well of another multi-branched horizontal well downwards in two multi-branched horizontal wells.
Further, the straight well circumference that is used with each multi-branched horizontal well is arranged.
Further, also comprise U type well or single horizontal well, U type well or single horizontal well comprise the straight well section.
Further, the part of the cooperation straight well of multi-branched horizontal well is set to the straight well section that described U type well or described list prop up horizontal well.
Simultaneously, the present invention also provides the job practices of a kind of coal bed gas horizontal well system, comprises the steps: that selected permanent position bores first straight well, is lowered to sleeve pipe in first straight well, carries out completion; With the first straight well preset distance first straight well section of boring first multi-branched horizontal well at interval; With first straight well and the first straight well section serves as that fixed point is launched arranging of first multi-branched horizontal well, and first multi-branched horizontal well is carried out completion; The sleeve pipe of being implemented in the straight well section completion process with first multi-branched horizontal well is removed, and this first straight well section is continued extended reach drilling downwards form second straight well, and second straight well is carried out completion; With second straight well preset distance straight well section of boring second multi-branched horizontal well at interval; With described second straight well and the second straight well section serves as that fixed point is launched arranging of first multi-branched horizontal well, and second multi-branched horizontal well is carried out completion.
Further, comprise the steps: that further the repetition above steps carries out the enforcement of each multi-branched horizontal well in regular turn, the straight well section of last multi-branched horizontal well extends to form the cooperation straight well of back one multi-branched horizontal well downwards.
Further, and second straight well at interval the preset distance process of boring the straight well section of second multi-branched horizontal well comprise: and the first straight well section and first straight well between extension line deflection one predetermined angular of line bore the second straight well section.
Further, with described second straight well at interval the preset distance process of boring the straight well section of second multi-branched horizontal well further comprise: will use as the straight well section of second multi-branched horizontal well with the straight well that first multi-branched horizontal well is used.
Further, the concrete steps that to use as the straight well section of second multi-branched horizontal well with the straight well that first multi-branched horizontal well is used are as follows: be lowered to packing device in first straight well that first multi-branched horizontal well is used, packing device is fixed on described first straight well is connected the cave with first multi-branched horizontal well top, forms the second straight well section.
Further, comprise the steps: that further the straight well that will be used with first multi-branched horizontal well is configured to another straight well section, and outwards bore a list with this straight well section and prop up horizontal well or U type well.
Advantage of the present invention: a kind of coal bed gas horizontal well of the present invention system, by the straight well section of the multi-branched horizontal well cooperation straight well as another multi-branched horizontal well is used, not only improved space availability ratio effectively, more can effectively utilize resource, reduced the construction volume of horizontal well ground preliminary work for spudding, the wellbore construction amount has been saved cost.
Except purpose described above, feature and advantage, the present invention also has other purpose, feature and advantage.With reference to figure, the present invention is further detailed explanation below.
Description of drawings
Accompanying drawing constitute this manual a part, be used for further understanding the present invention, accompanying drawing shows the preferred embodiments of the present invention, and is used for illustrating principle of the present invention with manual.Among the figure:
Fig. 1 shows the arrangement schematic diagram of a kind of coal bed gas horizontal well system in the prior art;
Fig. 2 shows the arrangement schematic diagram of second kind of coal bed gas horizontal well system in the prior art;
Fig. 3 shows the arrangement schematic diagram of coal bed gas horizontal well system in the first embodiment of the invention;
Fig. 4 shows the arrangement schematic diagram of coal bed gas horizontal well system among invention second embodiment; And
Fig. 5 shows the arrangement schematic diagram of coal bed gas horizontal well system among the third embodiment of the present invention.
The specific embodiment
Below in conjunction with accompanying drawing embodiments of the invention are elaborated, but the multitude of different ways that the present invention can be defined by the claims and cover is implemented.
A kind of coal bed gas horizontal well system in a kind of exemplary embodiment of the present invention, comprise a plurality of multi-branched horizontal wells, and a plurality ofly cooperate straight well 2 with each multi-branched horizontal well is used respectively, wherein, multi-branched horizontal well comprises straight well section 11, inclination section 13 and horizontal segment 15.Wherein the straight well section 11 of a described multi-branched horizontal well extends to form the cooperation straight well 2 of another described multi-branched horizontal well downwards.This structure is in identical productive area, owing to reduced the quantity of well, because reduced the construction volume of ground preliminary work for spudding, the wellbore construction amount has reduced the horizontal well straight well section of original pattern one to one and the idle and waste of inclination section, effectively utilize resource, and saved cost.Simultaneously can also improve space availability ratio effectively.
As shown in Figure 3, in first kind of embodiment of the present invention, in this coal bed gas horizontal well system, each multi-branched horizontal well is arranged in regular turn, and the straight well section 11 of last multi-branched horizontal well extends to form the cooperation straight well 2 of back one multi-branched horizontal well downwards.Such drilling well order can improve space availability ratio better, and more effectively carries out arranging of multi-branched horizontal well, reduces and drops into, and saves cost.Preferably, under the situation that ground condition allows, will be circle-shaped with the straight well 2 that each multi-branched horizontal well is used and arrange, and simultaneously can each multi-branched horizontal well be set in the shape of a spiral shape and arrange.Can reasonably utilize resource like this.And, such arrangement mode, drilling well, exploitation neither delay, and can come into operation after finishing the drilling well of first multi-branched horizontal well, and can carry out the wellbore construction of second multiple-limb level at the same time.
As shown in Figure 4, in second kind of embodiment of the present invention, in this coal bed gas horizontal well system, comprise many group multi-branched horizontal well groups, comprise two two multi-branched horizontal wells that extend towards rightabout in every group of described multi-branched horizontal well group, and each straight well section 11 extends to form the cooperation straight well 2 of another multi-branched horizontal well downwards in two multi-branched horizontal wells.This is a kind of optional mode of horizontal well of the present invention, this arrangement mode can be applied in a flexible way according to ground condition, can be applicable to alluviation zone, mountain valley, different ground conditions such as basin, narrow and small mountain valley allow to promptly arrange that the zone of well location is very little, the preliminary work for spudding difficulty is big, adopt the embodiment among second embodiment, can utilize landform to exploit natural resources, reduce drilling hole number simultaneously from branch, can save construction drops into before boring expense and drilling cost so in a large number, solve problems such as horizontal well waste.Preferably, under the situation that ground condition allows, will be circle-shaped with the straight well that each multi-branched horizontal well is used and arrange, each multi-branched horizontal well is oppositely arranged in twos.In less space, can increase the enforcement quantity and the area coverage of multi-branched horizontal well like this.
As shown in Figure 5, in the third embodiment of the present invention, in this coal bed gas horizontal well system, also comprise U type well 3 or single horizontal well, described U type well 3 or single horizontal well comprise straight well section 31.Such structure can make full use of the space, and when being not enough to dispose a multi-branched horizontal well, drilling area amasss less U type well or single horizontal well.The part of the cooperation straight well 2 of multi-branched horizontal well is set to the straight well section 31 of U type well or single horizontal well.Such structure can be utilized resource better.
Simultaneously, also provide the job practices of a kind of coal bed gas horizontal well system in the present invention, comprised the steps: that selected permanent position bores first straight well, in first straight well, be lowered to sleeve pipe, carried out completion; With the first straight well preset distance first straight well section of boring first multi-branched horizontal well at interval; With first straight well and the first straight well section serves as that fixed point is launched arranging of first multi-branched horizontal well, and first multi-branched horizontal well is carried out completion; The sleeve pipe of being implemented in the straight well section completion process with first multi-branched horizontal well is removed, and this first straight well section is continued extended reach drilling downwards form second straight well, and second straight well is carried out completion; With second straight well preset distance straight well section of boring second multi-branched horizontal well at interval; With second straight well and the described second straight well section serves as that fixed point is launched arranging of first multi-branched horizontal well, and second multi-branched horizontal well is carried out completion.
Preferably, above-mentioned steps further comprises the steps: the repetition above steps, carries out the enforcement of each multi-branched horizontal well in regular turn, and the straight well section of last multi-branched horizontal well extends to form the cooperation straight well of back one multi-branched horizontal well downwards.The multi-branched horizontal well of finishing construction can directly come into operation, and continues the wellbore construction of next multi-branched horizontal well then.
Preferably, and second straight well at interval the preset distance process of boring the straight well section of second multi-branched horizontal well comprise: and the first straight well section and first straight well between extension line deflection one predetermined angular of line bore the second straight well section.This angle is unsuitable too small, needs to guarantee to keep certain distance between two adjacent horizontal wells, and this angle is also unsuitable excessive, angle is crossed the waste that conference causes the space, certainly, and in concrete operation, need the base area potential condition, the operability of concrete analysis practice of construction.Preferably, with second straight well at interval the preset distance process of boring the straight well section of second multi-branched horizontal well further comprise: will use as the straight well section of second multi-branched horizontal well with the straight well that first multi-branched horizontal well is used.More preferably, the concrete steps that to use as the straight well section of second multi-branched horizontal well with the straight well that first multi-branched horizontal well is used are as follows: be lowered to packing device in first straight well that first multi-branched horizontal well is used, packing device is fixed on described first straight well is connected the cave with first multi-branched horizontal well top, forms the second straight well section.After finishing the wellbore construction of second multi-branched horizontal well, this packing device is reclaimed or bores and remove, recover the well-completing process of the cooperation straight well of its first multi-branched horizontal well.
Preferably, the job practices of a kind of coal bed gas horizontal well system comprises the steps: that further the straight well that will be used with first multi-branched horizontal well is configured to another straight well section, and outwards bores a list with this straight well section and prop up horizontal well or U type well.
A kind of horizontal well of the present invention system, by the straight well section of the multi-branched horizontal well cooperation straight well as another multi-branched horizontal well is used, not only improved space availability ratio effectively, more can effectively utilize resource, reduced the construction volume of horizontal well ground preliminary work for spudding, the wellbore construction amount has been saved cost.Simultaneously, simple and practical according to the job practices of a kind of coal bed gas horizontal well provided by the present invention system, be convenient to implement, can make rational use of resources, save cost.
A kind of coal bed gas horizontal well system provided by the present invention and job practices thereof are not only applicable to the exploitation of coal bed gas, are applicable to the geology mineral reserve that other uses the exploitation of drainage and step-down method simultaneously yet.
Be the preferred embodiments of the present invention only below, be not limited to the present invention, for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (12)
1. coal bed gas horizontal well system, comprise a plurality of multi-branched horizontal wells, and a plurality ofly cooperate straight well (2) with each described multi-branched horizontal well is used respectively, wherein, described multi-branched horizontal well comprises straight well section (11), it is characterized in that the straight well section (11) of one of them described multi-branched horizontal well extends to form the cooperation straight well (2) of another described multi-branched horizontal well downwards.
2. system according to claim 1 is characterized in that, each described multi-branched horizontal well is arranged in regular turn, and the straight well section (11) of last multi-branched horizontal well extends to form the cooperation straight well (2) of back one multi-branched horizontal well downwards.
3. system according to claim 1, it is characterized in that, comprise many group multi-branched horizontal well groups, comprise two two multi-branched horizontal wells that extend towards rightabout in every group of described multi-branched horizontal well group, and each straight well section (11) extends to form the cooperation straight well (2) of another multi-branched horizontal well downwards in two described multi-branched horizontal wells.
4. according to each described system of claim 1-3, it is characterized in that, arrange with straight well (2) circumference that each multi-branched horizontal well is used.
5. system according to claim 1 is characterized in that, also comprises U type well (3) or single horizontal well, and described U type well (3) or single horizontal well comprise straight well section (31).
6. system according to claim 5 is characterized in that, the part of the cooperation straight well (2) of described multi-branched horizontal well is set to the straight well section (31) that described U type well (3) or described list prop up horizontal well.
7. the job practices of a horizontal well system is characterized in that, comprises the steps:
First straight well is bored in selected permanent position, is lowered to sleeve pipe in described first straight well, carries out completion;
With the described first straight well preset distance first straight well section of boring first multi-branched horizontal well at interval;
With described first straight well and the described first straight well section serves as that fixed point is launched arranging of first multi-branched horizontal well, and described first multi-branched horizontal well is carried out completion;
The sleeve pipe of being implemented in the straight well section completion process with described first multi-branched horizontal well is removed, and this first straight well section is continued extended reach drilling downwards form second straight well, and second straight well is carried out completion;
With described second straight well preset distance straight well section of boring second multi-branched horizontal well at interval;
With described second straight well and the described second straight well section serves as that fixed point is launched arranging of second multi-branched horizontal well, and described second multi-branched horizontal well is carried out completion.
8. job practices according to claim 7 is characterized in that, further comprises the steps:
Each step is carried out the enforcement of each described multi-branched horizontal well in regular turn in the repetition claim 7, and the straight well section of last multi-branched horizontal well extends to form the cooperation straight well of back one multi-branched horizontal well downwards.
9. job practices according to claim 7 is characterized in that, the process of boring the straight well section of second multi-branched horizontal well with described second straight well interval preset distance comprises:
And the described first straight well section and first straight well between extension line deflection one predetermined angular of line bore the second straight well section.
10. job practices according to claim 7 is characterized in that, the process of boring the straight well section of second multi-branched horizontal well with described second straight well interval preset distance further comprises:
To use as the straight well section of second multi-branched horizontal well with the straight well that described first multi-branched horizontal well is used.
11. job practices according to claim 10 is characterized in that, the concrete steps that will use as the straight well section of second multi-branched horizontal well with the straight well that described first multi-branched horizontal well is used are as follows:
In first straight well that first multi-branched horizontal well is used, be lowered to packing device, described packing device is fixed on described first straight well is connected the cave with first multi-branched horizontal well top, form the second straight well section.
12. job practices according to claim 7 is characterized in that, further comprises the steps:
To be configured to another straight well section with the straight well that first multi-branched horizontal well is used, and outwards bore a list with this straight well section and prop up horizontal well or U type well.
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| CN201010290445XA CN101949284A (en) | 2010-09-25 | 2010-09-25 | Coalbed methane horizontal well system and construction method thereof |
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| CN201010290445XA CN101949284A (en) | 2010-09-25 | 2010-09-25 | Coalbed methane horizontal well system and construction method thereof |
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| CN103643918A (en) * | 2013-12-20 | 2014-03-19 | 北京大地高科煤层气工程技术研究院 | Method for searching for and preventing mine water seepage of Ordovician limestone mine field |
| CN104790915A (en) * | 2015-04-22 | 2015-07-22 | 西南石油大学 | Coal bed methane recovery method |
| CN105134162A (en) * | 2015-08-28 | 2015-12-09 | 中国神华能源股份有限公司 | U-shaped well system and drilling method thereof |
| CN107859482A (en) * | 2016-09-22 | 2018-03-30 | 中国石油天然气股份有限公司 | A kind of halberd formula coal bed gas horizontal well drilling method |
| CN104453833B (en) * | 2014-10-30 | 2018-05-18 | 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 |
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| 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 |
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| RU2459069C1 (en) * | 2011-09-06 | 2012-08-20 | Открытое акционерное общество "Татнефть" им. В.Д. Шашина | Multi-formation oil deposit development method |
| CN103643918A (en) * | 2013-12-20 | 2014-03-19 | 北京大地高科煤层气工程技术研究院 | Method for searching for and preventing mine water seepage of Ordovician limestone mine field |
| CN103643918B (en) * | 2013-12-20 | 2016-01-20 | 北京大地高科煤层气工程技术研究院 | A kind of searching for Ordovician limestone mining area and the method preventing mine from seeping water |
| CN104453833B (en) * | 2014-10-30 | 2018-05-18 | 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 |
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| CN105134162A (en) * | 2015-08-28 | 2015-12-09 | 中国神华能源股份有限公司 | U-shaped well system and drilling method thereof |
| CN107859482A (en) * | 2016-09-22 | 2018-03-30 | 中国石油天然气股份有限公司 | A kind of halberd formula coal bed gas horizontal well drilling method |
| CN107859482B (en) * | 2016-09-22 | 2019-06-11 | 中国石油天然气股份有限公司 | A kind of halberd formula coal bed gas horizontal well drilling method |
| CN110242254A (en) * | 2018-08-24 | 2019-09-17 | 北京奥瑞安能源技术开发有限公司 | A kind of coal bed methane exploring method |
| CN110242254B (en) * | 2018-08-24 | 2021-08-20 | 北京奥瑞安能源技术开发有限公司 | Coal bed gas mining method |
| CN109025952A (en) * | 2018-10-29 | 2018-12-18 | 中国神华能源股份有限公司 | Horizontal well and its construction method |
| 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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Application publication date: 20110119 |