CN101936155B - Distributed structure of horizontal section of multi-branch horizontal coal bed methane well - Google Patents
Distributed structure of horizontal section of multi-branch horizontal coal bed methane well Download PDFInfo
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Abstract
The invention provides a distributed structure of a horizontal section of a multi-branch horizontal coal bed methane well, which comprises a main borehole, and branch boreholes connected to the main borehole. The main borehole comprises a first main borehole and at least one second main borehole; the second main borehole is a branch of the first main borehole; and in the first main borehole and the at least one second main borehole, the outer sides of two branch main boreholes positioned on the outermost parts are respectively provided with a group of branch boreholes. In the distributed structure of the horizontal section of the multi-branch horizontal coal bed methane well, by increasing the number of the main boreholes, the branch boreholes originally connected to the two sides of the same main borehole are distributed to the two sides of the two main boreholes, the pressure of the main boreholes serving as drainage and pressure release channels is reduced, and the footage of the main boreholes per se is fully utilized. Meanwhile, the risk that the main boreholes are damaged, complicated or blocked is dispersed. The footage of the tail end of the horizontal section of the horizontal well is relatively reduced, and the probability that the footage of the tail end of the horizontal section of the horizontal well is actually invalid when the main boreholes are declined due to terrain declination is reduced.
Description
Technical field
The present invention relates to coal-bed gas exploitation field, relate more specifically to a kind of distributed architecture of coal bed gas multi-branch horizontal horizontal segment.
Background technology
Coal bed gas is the unconventional natural gas that storage formula is conigenous in coal seam itself certainly, mainly comprises 90% CH4.In the situation that international energy situation is becoming tight, coal bed gas is as a kind of energy of high-quality and efficient cleaning, there is very wide DEVELOPMENT PROSPECT, coal bed gas can be used as fuel used to generate electricity, industrial fuel and resident living fuel, also after liquefiable as motor vehicle fuel, also can be widely used in and produce synthetic ammonia, formaldehyde, methyl alcohol, carbon black etc.
In the productive area of coal bed gas and exploitation effect and coal seam, the arrangement of horizontal well horizontal segment has direct relation.The drilling depth amount of horizontal well horizontal segment is larger, and the area of its exploitation is also just wider, and yield is also more.Fig. 1 shows the arrangement of horizontal well horizontal segment in prior art.As shown in Figure 1, the horizontal hole arrangement of existing level well horizontal segment comprises main borehole 231, in order to expand the productive area of the coal bed gas branch well hole 235 that distributing uniformly in the both sides of main borehole 231.As shown in Figure 1, this structure is similar to the distribution situation of vein in leaf.
There are the following problems for the arrangement of existing this horizontal well horizontal segment:
1. existing horizontal well need to be waited until after last branch well hole drilling well completes and just can carry out the exploitation of coal bed gas, in this process, because drilling tool removes and rotates for a long time in this section of well, easily causes down-hole destroyed or complicated.So-called complexity refer to drilling tool in down-hole the normal situation of drilling well.Once there is complexity, may cause whole section of horizontal well cannot continue construction, and waste a large amount of manpower and materials.
2. all branches are all arranged on a main borehole, and arranging between branch well hole and main borehole is too intensive, and this makes the drilling depth on main borehole just be used as the passage of drainage pressure-reducing, and fails to realize effect of the coal bed gas extraction of drilling depth on main borehole.
3, in the time that on main borehole, part is stopped up, all drilling depths after this obstruction point will be invalid, and production capacity can sharply decline, not even aerogenesis, and whole exploitation engineering is forced to stop production entirety to carry out drifting transformation.
4. in selected region, the physical features of horizontal well end declines while causing main borehole to have a down dip, in the time of the larger situation of the two ends of main borehole difference in height, because arranging of main borehole and branch well hole in existing horizontal well arrangement mode is intensive, may a lot of drilling depths on desorption pressures and cause drilling depth considered repealed.
Summary of the invention
The object of the invention is the arrangement of the horizontal segment that a kind of coal bed gas multi-branch horizontal is provided, to solve irrational distribution in coal seam of existing level well, too tight, once the local obstruction of main borehole is not smooth, the risk of wellbore construction stage complexity and lock of tool drilling will be caused, invalid because of stopping up the drilling depth producing after stopping up section at mining phase, the result that this well capacity sharply declines.
For this reason, the invention provides a kind of distributed architecture of coal bed gas multi-branch horizontal horizontal segment, comprise main borehole and be connected to the branch well hole on main borehole, main borehole comprises the first main borehole and at least one the second main borehole, the second main borehole is the branch of the first main borehole, in the first main borehole and at least one the second main borehole, the outside that is positioned at outermost two main boreholes is respectively provided with a group of branches well.
According to further improvement of the present invention, on the first main borehole, be connected with second main borehole, the outside of the first main borehole and the second main borehole is respectively provided with a group of branches well.
According to further improvement of the present invention, the both sides of the first main borehole are respectively connected with second main borehole, and the outside of two the second main boreholes is respectively provided with a group of branches well.
According to further improvement of the present invention, the distance between the side tracking point between the second main borehole and the first main borehole and multi-branched horizontal well and the connectivity points of diameter is not less than 5m.
According to further improvement of the present invention, the distance on the first main borehole between the side tracking point of adjacent two the second main boreholes of homonymy is not less than 30m.
According to further improvement of the present invention, the distance between the side tracking point of two the second main boreholes that on the first main borehole, heteropleural is adjacent is not less than 10m.
According to further improvement of the present invention, the angle between adjacent two main boreholes is 10 °-20 °.
According to further improvement of the present invention, the distance being connected between the side tracking point of the each contiguous branch well on same main borehole is 120-200m.
According to further improvement of the present invention, between main borehole and the each branch well hole being connected thereon, angle is 30-50 degree.
According to further improvement of the present invention, from the terminal of main borehole to initiating terminal direction, the angle being connected between each branch well hole and this main borehole on same main borehole increases successively gradually.
Invent advantage of the present invention:
1. the distributed architecture of coal bed gas multi-branch horizontal horizontal segment provided by the present invention, by increasing the quantity of main borehole, the branch well hole that is originally connected to same main borehole both sides is distributed to the both sides of two main boreholes, alleviate the pressure of main borehole as drainage pressure-reducing passage, the drilling depth of main borehole own is fully used.
2. disperseed the risk that main borehole down-hole is destroyed, complicated or stop up, improved in work progress because down-hole is destroyed or complicated brought well obstruction cannot continue in construction and recovery process because stopping up the situation that causes production capacity sharply to decline in part.
3. relatively reduce the drilling depth amount of horizontal well horizontal segment end, reduced while causing main borehole to have a down dip because of physical features decline the probability that horizontal well horizontal segment end drilling depth is actual invalid.
Except object described above, feature and advantage, the present invention also has other object, feature and advantage.Below with reference to figure, the present invention is further detailed explanation.
Accompanying drawing explanation
Accompanying drawing forms the part of this manual, 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 together with manual.In figure:
Fig. 1 shows existing coal bed gas multi-branch horizontal horizontal segment distributed architecture schematic diagram;
Fig. 2 shows the coal bed gas multi-branch horizontal horizontal segment distributed architecture schematic diagram according to an embodiment of the present invention; And
Fig. 3 shows the coal bed gas multi-branch horizontal horizontal segment distributed architecture schematic diagram of the another kind of embodiment according to the present invention.
The specific embodiment
Below in conjunction with accompanying drawing, embodiments of the invention are elaborated, following examples and accompanying drawing are only in order to help understanding the present invention, and can not limit protection scope of the present invention, and the multitude of different ways that the present invention can be defined by the claims and cover is implemented.
Comprise main borehole and be connected to the branch well hole on main borehole according to the distributed architecture of coal bed gas multi-branch horizontal horizontal segment of the present invention.Main borehole comprises the first main borehole 231 and at least one the second main borehole 233, the second main borehole 233 is the branch of the first main borehole 231, in the first main borehole and at least one the second main borehole, the outside that is positioned at outermost two main boreholes be respectively provided with one group described in branch well hole 235.
As shown in Figure 2, in Fig. 2, provide according to the present invention a kind of specific embodiment of coal bed gas multi-branch horizontal structure, according to the present invention, coal bed gas multi-branch horizontal structure comprises connectivity points 11, the straight well section of horizontal well, inclination section, the horizontal segment of straight well 10, horizontal well 20, straight well 10 and horizontal well 20 in this embodiment, horizontal segment comprises that the first main borehole 231 and the second main borehole 233, the first main boreholes 231 are arranged on the bearing of trend of horizontal well inclination section.The second main borehole 233 is a branch of the first main borehole 231.Respectively be provided with a group of branches well 235 in the outside of the first main borehole 231 and the second main borehole 233.Wherein preferably, between the first main borehole 231 and the second main borehole 233, be provided with certain angle, this angle is not less than 10 degree.Angle too small, can make the hypotelorism of two main boreholes, and area coverage is little and be unfavorable for the exploitation of coal bed gas.More preferably, this angle is in the scope of 10-20 degree, and angle is excessive, can make the hypertelorism of two main boreholes and can not effectively cover the region that will exploit.
As shown in Figure 3, in Fig. 3, provide according to the present invention the another kind of specific embodiment of coal bed gas multi-branch horizontal horizontal segment distributed architecture, in this embodiment according to the present invention in coal bed gas multi-branch horizontal horizontal segment distributed architecture, the horizontal segment of horizontal well comprises first main borehole 231 and two the second main boreholes 233, two the second main boreholes 233 are all the branches of the first main borehole 231, are connected to the both sides of the first main borehole 231.The outside of two the second main boreholes 233 is respectively provided with a group of branches well 235.Two the second main boreholes 233 angle respectively and between the first main borehole 231 is all not less than 10 degree, is preferably between 10-20 degree.
The area coverage, the shape in region to be developed and the coal geology situation of region that require according to operator are analyzed, can be connected with in the both sides of the first main borehole 231 of horizontal well horizontal segment branched the second main borehole 233 (not specifically illustrating in figure), as even more in 3,4,5,6,7,8.The well at the connectivity points place between multi-branched horizontal well and diameter is normally passed through special reaming hole in the prior art, and this makes the borehole diameter of this place's well larger than the diameter of other well section.As preferably mode of one, the distance between side tracking point and the connectivity points 11 of multi-branched horizontal well and straight well between the second main borehole 233 and the first main borehole 231 is not less than 5m.In multi-branched horizontal well drilling process, need to be supported and be carried out sidetracking to drilling tool, the too little support being unfavorable for drilling tool of distance between side tracking point and multi-branched horizontal well and the connectivity points of straight well between the second main borehole 233 and the first main borehole 231, easily cause sidetracking weak effect, even sidetracking failure.If simultaneously the side tracking point between the second main borehole 233 and the first main borehole 231 and the distance between multi-branched horizontal well and the connectivity points of straight well are too little, when sidetracking, drill string vibration can destroy the borehole wall at connectivity points place, the complex situations such as probably cause to collapse in this position.
The speed consideration departing between the old and new's well during from downhole safety and sidetracking, as preferably mode of one, the distance on the first main borehole 231 between the side tracking point of each adjacent two the second main boreholes 233 of homonymy is not less than 30m.Distance between the side tracking point of two the second main boreholes 233 that wherein, on the first main borehole 231, heteropleural is adjacent is not less than 10m.Certainly many-sided cooperation such as the deflecting ability of the hole deviation by side tracking point, regularity of coal seam, power drilling tool, in the distance that is less than 10m, boring two the second main boreholes also can be successful, but such process wastes time and energy, and easily there is failed situation.More preferably, in the distributed architecture of coal bed gas multi-branch horizontal horizontal segment of the present invention, the angle between adjacent two main boreholes is not less than 10 °, is preferably between 10-20 degree.
As more preferably embodiment of one, in the distributed architecture of coal bed gas multi-branch horizontal horizontal segment of the present invention, the distance being connected between the side tracking point of the each contiguous branch well on same main borehole is 120-200m.According to the requirement of exploitation rate, if ask fast Development, the spacing between branch well hole is just smaller so, distributes closeer, and on the contrary, branch well hole just distributes just more sparse.In the present invention, be connected to range difference between the corresponding side tracking point of contiguous branch well of main borehole homonymy in distance between the side tracking point of the each contiguous branch well on same main borehole and prior art few, but because main borehole in prior art is that both sides drill through branch well hole simultaneously, be 60-100m left and right and cause the actual range between adjacent two side tracking points on main borehole.This too small distance makes two drilling depths between tie point can only serve as the passage of drainage pressure-reducing, and fails this section of drilling depth to carry out coal bed gas extraction.And in the present invention, by the arrange both sides of two main boreholes of the branch well hole that is originally arranged in same main borehole both sides, this arrangement has many advantages, as, reduce the accident probability during wellbore construction, and for example, in the time that wherein a main borehole stops up, be unlikely to all to block because stopping up section well afterwards, and cause output significantly to decline, for another example, when in selected production zone, the physical features of horizontal well end declines the main borehole that causes while having a down dip, when the larger situation of main borehole two ends difference in height, at coal bed gas multi-branch horizontal horizontal segment distributed architecture according to the present invention compared with existing coal bed gas multi-branch horizontal horizontal segment distributed architecture, dwindle widely the drilling depth amount of horizontal well end, also be only that the end drilling depth of horizontal well of fraction is on desorption pressures and lost efficacy.
More preferably, in the distributed architecture of coal bed gas multi-branch horizontal horizontal segment of the present invention, between main borehole and the each branch well hole being connected thereon, angle is 30-50 degree.Angle between " angle " is branch well hole herein main bearing of trend and this main borehole.More preferably, from the end of main borehole to initiating terminal direction, the angle between each branch well hole and main borehole increases successively gradually.So arrange, can increase the scope of arranging of branch well hole, be more suitable for the exploitation of coal bed gas.It should be noted that, each main borehole can be identical with the angle between the branch well hole of arranging thereon, also can be different, if comprise in Fig. 2 two main boreholes are example, from the end of main borehole to initiating terminal direction, the angle between the first main borehole 231 and the branch well hole 235 of arranging is thereon followed successively by 35 degree, 40 degree, 45 degree.Angle between the second main borehole 233 and the branch well hole 235 of arranging is thereon followed successively by 32 degree, 36 degree, 40 degree.Definite boundary constraint of depending on the general requirement of concrete regionl development and the exploitation mineral rights of target area of the extension angle of each branch well hole.
In the distributed architecture of coal bed gas multi-branch horizontal horizontal segment of the present invention, the requirement of operator to horizontal well total footage depended in the selection of the quantity of each main borehole top set well, drilling depth at most numbers of branches is just many, take the situation of two main boreholes as example, the coal seam drilling depth of general 3000 meters, can be by two main boreholes and 4-5 branch's realization, the coal seam drilling depth of 4000m, need two main boreholes and 6 branches, the coal seam drilling depth requirement of 5000m, just needs two main boreholes and 7-8 branch.
The drilling well order of the distributed architecture of coal bed gas multi-branch horizontal horizontal segment provided by the invention is that subdrilling the first main borehole 231, in the situation that only having two main boreholes, bores after the first main borehole 231, bores the branch well hole that the first main borehole outside is connected with.Bore successively the second main borehole according to the terminal from main borehole to initiating terminal direction again.Get into after outermost the second main borehole, at the outer sidetracking branch well hole of outermost the second main borehole.The order of boring branch well hole is to initiating terminal direction successively drilling well according to the terminal of the main borehole connecting from these branch well holes.
The distributed architecture of coal bed gas multi-branch horizontal horizontal segment provided by the present invention, by increasing the quantity of main borehole, the branch well hole that is originally connected to same main borehole both sides is distributed to the both sides of two main boreholes, alleviate the pressure of main borehole as drainage pressure-reducing passage, the drilling depth of main borehole own is fully used.Meanwhile, disperseed the risk that main borehole down-hole is destroyed, complicated or stop up.Relatively reduce the drilling depth amount of horizontal well horizontal segment end, reduced while causing main borehole to have a down dip because of physical features decline the probability that horizontal well horizontal segment end drilling depth is actual invalid.
Although the present invention is illustrated with preferred embodiment by reference to the accompanying drawings, obviously, for a person skilled in the art, not deviating under the prerequisite of the spirit and scope of the present invention, can make various modifications and variations to the present invention.Therefore, various change of the present invention, variation are contained by the content of appending claims and equivalent thereof.
Claims (6)
1. the distributed architecture of a coal bed gas multi-branch horizontal horizontal segment, comprise main borehole, and be connected to the branch well hole on described main borehole, it is characterized in that, described main borehole comprises the first main borehole (231) and the second main borehole (233), described the second main borehole (233) is the branch of described the first main borehole (231), described the first main borehole (231) is arranged on the bearing of trend of horizontal well inclination section, the both sides of described the first main borehole (231) are respectively connected with described second main borehole (233), the outside of two described the second main boreholes (233) be respectively provided with one group described in branch well hole (235), distance between the side tracking point of two the second main boreholes that on described the first main borehole, heteropleural is adjacent is not less than 10m.
2. the distributed architecture of coal bed gas multi-branch horizontal horizontal segment according to claim 1, is characterized in that, the distance between the side tracking point between described the second main borehole and the first main borehole and multi-branched horizontal well and the connectivity points of straight well is not less than 5m.
3. the distributed architecture of coal bed gas multi-branch horizontal horizontal segment according to claim 1, is characterized in that, the angle between adjacent two main boreholes is 10 °-20 °.
4. the distributed architecture of coal bed gas multi-branch horizontal horizontal segment according to claim 1, is characterized in that, the distance being connected between the side tracking point of the each contiguous branch well on same main borehole is 120-200m.
5. the distributed architecture of coal bed gas multi-branch horizontal horizontal segment according to claim 1, is characterized in that, between described main borehole and the each described branch well hole being connected thereon, angle is 30-50 degree.
6. the distributed architecture of coal bed gas multi-branch horizontal horizontal segment according to claim 5, it is characterized in that, from the terminal of described main borehole to initiating terminal direction, the angle being connected between each described branch well hole and this main borehole on same main borehole increases successively gradually.
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| CN102080518B (en) * | 2011-01-17 | 2012-08-22 | 河南理工大学 | Method for extracting gas from coal seam roof complex branched well |
| CN102121364A (en) * | 2011-02-14 | 2011-07-13 | 中国矿业大学 | Well structure of pressure-releasing coal bed gas ground extraction well and arrangement method thereof |
| 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 |
| CN102493790A (en) * | 2011-12-27 | 2012-06-13 | 北京奥瑞安能源技术开发有限公司 | Method for increasing yield of coal bed gas |
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| CN103924958A (en) * | 2013-05-31 | 2014-07-16 | 华北石油管理局 | Coal bed gas multi-branch horizontal well applicable to syncline structures |
| CN103993827B (en) * | 2014-06-12 | 2016-07-06 | 北京奥瑞安能源技术开发有限公司 | Under balance pressure drilling method and system for coal bed gas |
| CN104265261B (en) * | 2014-08-11 | 2017-06-13 | 中国石油天然气股份有限公司 | Fish bone well branch horizontal well structure |
| CN107339093A (en) * | 2017-08-25 | 2017-11-10 | 辽宁工程技术大学 | A kind of drilling well for gas drainage method for arranging of imitative schneider zelkova leaf kank structure |
| CN108894765A (en) * | 2018-08-24 | 2018-11-27 | 广州海洋地质调查局 | The major-minor well construction and its method of deep water shallow layer gas hydrate exploitation |
| CN109209474B (en) * | 2018-09-27 | 2020-07-28 | 太原理工大学 | Method for extracting gas and accumulated water from coal seam and upper multi-goaf by double branch well |
| CN109577941B (en) * | 2018-11-23 | 2022-04-29 | 北京奥瑞安能源技术开发有限公司 | Coal bed gas drilling and mining method |
| CN112780248B (en) * | 2019-11-04 | 2022-08-05 | 中国石油天然气股份有限公司 | Coal bed gas horizontal well and construction method thereof |
| CN111963109B (en) * | 2020-07-20 | 2022-09-16 | 西山煤电(集团)有限责任公司钻探分公司 | Multi-branch horizontal well coal mining goaf gas extraction process |
| CN112963124A (en) * | 2021-02-23 | 2021-06-15 | 重庆万普隆能源技术有限公司 | Coal bed gas extraction method |
| CN112943343B (en) * | 2021-03-17 | 2023-05-26 | 河南理工大学 | Efficient and rapid fire extinguishing method for ground drilling of different types of fires in coal mine goaf |
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| CN1333858A (en) * | 1998-11-20 | 2002-01-30 | Cdx天然气有限公司 | Method and system for accessing substerranean deposits from the surface |
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Denomination of invention: Distributed structure of horizontal section of multi-branch horizontal coal bed methane well Effective date of registration: 20150925 Granted publication date: 20140604 Pledgee: Haidian Beijing science and technology enterprise financing Company limited by guarantee Pledgor: Beijing Aoruian Energy Source Tech. & Dev. Co., Ltd. Registration number: 2015990000827 |
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