CN203035177U - Coalbed methane (CBM) multi-branch horizontal well with communicating point in top plate or bottom plate rock stratum - Google Patents
Coalbed methane (CBM) multi-branch horizontal well with communicating point in top plate or bottom plate rock stratum Download PDFInfo
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- CN203035177U CN203035177U CN 201220591950 CN201220591950U CN203035177U CN 203035177 U CN203035177 U CN 203035177U CN 201220591950 CN201220591950 CN 201220591950 CN 201220591950 U CN201220591950 U CN 201220591950U CN 203035177 U CN203035177 U CN 203035177U
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Abstract
A coalbed methane (CBM) multi-branch horizontal well with a communicating point in a top plate or bottom plate rock stratum is applied to drilling engineering of the CBM multi-branch horizontal well. The CBM multi-branch horizontal well with the communicating point in the top plate or bottom plate rock stratum is characterized by comprising a drainage and extraction straight well and the multi-branch horizontal well which is communicated with the drainage and extraction straight well. The drainage and extraction straight well is provided with a straight well hole, and the communicating point of the multi-branch horizontal well and the drainage and extraction straight well is the straight well hole with the position in a stable top plate rock stratum or a bottom plate rock stratum. The multi-branch horizontal well is provided with a straight well section, a horizontal well main branch and a horizontal well sub branch. The CBM multi-branch horizontal well with the communicating point in the top plate or bottom plate rock stratum has the advantages of solving the hole stability problem at the position of the communicating point of the CBM multi-branch horizontal well and the drainage and extraction straight well and solving the difficult problem that subsequent operations can not be carried out due to the facts that the communicating point is collapsed and a drilling tool can not enter a main well bore behind the communicating point in the drilling process of the CBM multi-branch horizontal well.
Description
Technical field
The present invention relates to the petroleum drilling engineering technical field, particularly a kind of coal bed gas multi-branched horizontal well drilling engineering is the coal bed gas multi-branched horizontal well of a kind of connectivity points in top board or floor strata.
Background technology
Consult Fig. 1.At present, the coal bed gas multi-branched horizontal well is all formed by arranging the multi-branched horizontal well 1 of adopting straight well 2 and being communicated with it flatly flatly both at home and abroad.The connectivity points that row adopts straight well 2 and multi-branched horizontal well 1 is that the position in straight well cave 3 is selected in the coal seam 7.In order to be easy to realize that multi-branched horizontal well 1 and row adopt straight well 2 and successfully dock and set up gas-liquid channel in coal seam 7, adopt the position, coal seam of straight well 2 row and make a straight well cave 3.The coal seam 7 of connectivity points is through after making technologies such as cave, connection, and serious breaking encircled the original glued stress of coal petrography, makes original easier the collapsing in coal seam of just easily collapsing.In the drilling process, if the Coal Seam Collapse around the straight well cave 3 will cause the main borehole after drilling tool can't enter the cave, subsequent job can't normally carry out.After the completion collapse in the pump drainage process if cave, and will cause row to adopt instrument can't be lowered to, and row adopts operation and can't normally carry out.
The patent No. be CN201020542991.3's " a kind of coal bed gas multi-branched horizontal well system and help Pai Jing ", disclose a kind of Pai Jing that helps that is suitable for that cooperates with the coal bed gas multi-branched horizontal well, helped Pai Jing to be arranged on canting under the physical features of coal seam in the multi-branched horizontal well horizontal segment.The row's of helping well adopts at the end of multi-branched horizontal well horizontal segment and arranges drilling engineering in this invention, to reduce the fluid pressure in the branch, and utilize stepout well in the target geologic body, to produce passage to make it to be communicated with multi-branched horizontal well, assist the multi-branched horizontal well drainage and step-down, reach the purpose of gas desorption in the geologic body, improve by the development efficiency of practise midwifery well.But during this invention helped row's well and is located at target geologic body (coal seam) being communicated with of multi-branched horizontal well, the stability of connectivity points was difficult to guarantee.
Summary of the invention
The objective of the invention is: the coal bed gas multi-branched horizontal well of a kind of connectivity points in top board or floor strata is provided, coal bed gas multi-branched horizontal well and the connectivity points that row adopts straight well are arranged in stable top board (or base plate) rock stratum, top, coal seam (or bottom).Solve the coal bed gas multi-branched horizontal well and arrange the hole stability problem that straight well is communicated with the position of adopting, for wellbore construction and later maintenance operation provide stable borehole environment, create favorable conditions for row adopts operation.
The technical solution used in the present invention is: the coal bed gas multi-branched horizontal well of connectivity points in top board or floor strata, adopt straight well and adopt the multi-branched horizontal well that straight well is communicated with row flatly and form by row flatly, row adopts straight well the straight well cave, multi-branched horizontal well is the straight well cave with the connectivity points that row adopts straight well, and it is characterized in that: the position in described straight well cave is in stable roof strata or floor strata; Multi-branched horizontal well has straight well section, horizontal well master to prop up and branch.
This multi-branched horizontal well is applicable to the monocline coal seam with stable roof strata or floor strata, and row adopts the updip direction that straight well is positioned at the straight well section of multi-branched horizontal well, and the straight well section of multi-branched horizontal well and row adopt the horizontal range of straight well between 200～350m.Adopt on the straight well and adopt straight well connectivity points place multi-branched horizontal well and row and made the straight well cave row, the top in the bottom in straight well cave or straight well cave is 1～3m to the distance in coal seam, and the diameter in straight well cave is 0.2～0.8m, and the height in straight well cave is 2～6m;
Horizontal well master Zhi Zaiyu row adopts straight well after place, straight well cave is communicated with, and pierces the coal seam with the hole angle between 90～98 °; Prop up 3～8 branches of sidetracking the horizontal well master, branch is in the coal seam, and the length of branch is between 50～600m, and branch's side tracking point spacing is 50～200m.
Beneficial effect of the present invention: the coal bed gas multi-branched horizontal well of connectivity points of the present invention in top board or floor strata efficiently solves the coal bed gas multi-branched horizontal well and adopts the cave stable problem at straight well connectivity points place with row; Solved in the coal bed gas multi-branched horizontal well drilling process, the collapse drilling tool that causes of connectivity points can't enter main borehole after the connectivity points, the technical barrier that causes subsequent job to carry out; Solved after the completion that connectivity points collapses in the pump drainage process, the technical problem that instrument can't be lowered to is adopted by the row of causing.
Description of drawings
Fig. 1 is the coal bed gas multi-branched horizontal well schematic diagram of existing connectivity points in the coal seam.
Fig. 2 is the coal bed gas multi-branched horizontal well structural profile schematic diagram of connectivity points in roof strata of embodiment 1.
Fig. 3 is the coal bed gas multi-branched horizontal well structural profile schematic diagram of connectivity points in the base plate mud stone of embodiment 2.
Among the figure: the 1-multi-branched horizontal well, 2-row adopts straight well, 3-straight well cave, the 4-roof strata, 5-branch, 6-horizontal well master props up, 7-coal seam, 8-floor strata.
The specific embodiment
Embodiment 1: be example with the coal bed gas multi-branched horizontal well of a connectivity points in top board or floor strata, the present invention is described in further detail.Certain sedimentary basin coal seam buried depth 775m, the thick 4.2m in coal seam, 4 ° of seam inclinations, the top, coal seam is the Dark grey mud stone, 5 ° of stratigraphic dips, thick 5.4m.
Consult Fig. 2.The coal bed gas multi-branched horizontal well of connectivity points of the present invention in roof strata, adopt straight well 2 and adopt the multi-branched horizontal well 1 that straight well 2 is communicated with row flatly and form by row flatly, row adopts straight well 2 straight well cave 3, multi-branched horizontal well 1 is straight well cave 3 with the connectivity points that row adopts straight well 2, and it is characterized in that: the position in described straight well cave 3 is in stable roof strata 4; Multi-branched horizontal well 1 has straight well section, horizontal well master to prop up 6 and branch 5.
This multi-branched horizontal well 1 is applicable to the monocline coal seam with stable roof strata 4, and row adopts the updip direction that straight well 2 is positioned at the straight well section of multi-branched horizontal well 1, and the straight well section of multi-branched horizontal well 1 is adopted the horizontal range of straight well 2 at 300m with row.Adopt on the straight well 2 and adopt straight well 2 connectivity points places at multi-branched horizontal well 1 with row and made straight well cave 3 row, 7 distance is 2m to the coal seam in the bottom in straight well cave 3, and the diameter in straight well cave 3 is 0.5m, and the height in straight well cave 3 is 4m;
The horizontal well master props up 6 adopting straight well 2 after 3 places, straight well cave are communicated with row, pierces the coal seam with 90.5 ° hole angles, a main horizontal section length 900m; Prop up 8 branches 5 of sidetracking on 6 the horizontal well master, branch 5 in coal seam 7, the length 520m of branch 5, branch's 5 side tracking point spacings are 90m.
Embodiment 2: consult Fig. 3.Embodiment 2 with embodiment 1 difference is: the coal bed gas multi-branched horizontal well of connectivity points of the present invention in floor strata, the position in its straight well cave 3 is in stable floor strata 8.This multi-branched horizontal well 1 is applicable to the monocline coal seam with stable floor strata 8, and 7 distance is 1.5m to the coal seam at the top in straight well cave 3.
Claims (4)
1. the coal bed gas multi-branched horizontal well of a connectivity points in top board or floor strata, adopting straight well (2) and a bite and row by row flatly adopts the multi-branched horizontal well (1) that straight well (2) is communicated with and forms, row adopts straight well (2) straight well cave (3), multi-branched horizontal well (1) is straight well cave (3) with the connectivity points that row adopts straight well (2), and it is characterized in that: the position in described straight well cave (3) is in stable roof strata (4) or floor strata (8); Multi-branched horizontal well (1) has straight well section, horizontal well master to prop up (6) and branch (5).
2. the coal bed gas multi-branched horizontal well of connectivity points according to claim 1 in top board or floor strata, it is characterized in that: multi-branched horizontal well (1) is applicable to the monocline coal seam with stable roof strata (4) or floor strata (8), row adopts the updip direction that straight well (2) is positioned at the straight well section of multi-branched horizontal well (1), and the straight well section of multi-branched horizontal well (1) and row adopt the horizontal range of straight well (2) between 200～350m.
3. the coal bed gas multi-branched horizontal well of connectivity points according to claim 1 in top board or floor strata, it is characterized in that: adopt straight well (2) row and go up and adopt straight well (2) connectivity points place at multi-branched horizontal well (1) with row and made straight well cave (3), the distance of (7) is 1～3m to the coal seam at the top of the bottom in straight well cave (3) or straight well cave (3), the diameter in straight well cave (3) is 0.2～0.8m, and the height of straight well cave (3) is 2～6m.
4. the coal bed gas multi-branched horizontal well of connectivity points according to claim 1 in top board or floor strata, it is characterized in that: the horizontal well master props up (6) adopting straight well (2) after straight well cave (3) are located to be communicated with row, pierces the coal seam with the hole angle between 90～98 °; Prop up (6) the horizontal well master and go up 3～8 branches of sidetracking (5), branch (5) is in coal seam (7), and the length of branch (5) is between 50～600m, and branch (5) side tracking point spacing is 50～200m.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201220591950 CN203035177U (en) | 2012-11-12 | 2012-11-12 | Coalbed methane (CBM) multi-branch horizontal well with communicating point in top plate or bottom plate rock stratum |
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| CN 201220591950 CN203035177U (en) | 2012-11-12 | 2012-11-12 | Coalbed methane (CBM) multi-branch horizontal well with communicating point in top plate or bottom plate rock stratum |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103867180A (en) * | 2013-09-11 | 2014-06-18 | 华北石油管理局 | Coal bed gas horizontal well track control method |
| CN103924917A (en) * | 2013-09-11 | 2014-07-16 | 华北石油管理局 | Drilling construction method for coal-bed gas multi-branch horizontal wells |
| CN104695935A (en) * | 2013-12-06 | 2015-06-10 | 中国石油天然气集团公司 | Well drilling position selection method in consideration of coal seam crushing degree |
| 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 |
| CN108643867A (en) * | 2018-05-21 | 2018-10-12 | 河南工程学院 | Coal extraction coal bed gas technique is drawn in a kind of release, water-jet |
| CN111980642A (en) * | 2020-09-01 | 2020-11-24 | 中联煤层气有限责任公司 | Construction method of coal bed gas multi-branch horizontal well and multi-branch horizontal well |
| CN114607318A (en) * | 2022-03-24 | 2022-06-10 | 中煤科工集团西安研究院有限公司 | Fracturing cooperative construction method for combined production and drilling of multi-layer horizontal well for deep coal bed methane |
| CN116940745A (en) * | 2023-04-25 | 2023-10-24 | 平安煤矿瓦斯治理国家工程研究中心有限责任公司 | Well type structure for butt joint of coal bed gas at near end of single well field and opening method |
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2012
- 2012-11-12 CN CN 201220591950 patent/CN203035177U/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103867180A (en) * | 2013-09-11 | 2014-06-18 | 华北石油管理局 | Coal bed gas horizontal well track control method |
| CN103924917A (en) * | 2013-09-11 | 2014-07-16 | 华北石油管理局 | Drilling construction method for coal-bed gas multi-branch horizontal wells |
| CN103867180B (en) * | 2013-09-11 | 2015-08-12 | 华北石油管理局 | A kind of coal bed gas horizontal well method for controlling trajectory |
| CN104695935A (en) * | 2013-12-06 | 2015-06-10 | 中国石油天然气集团公司 | Well drilling position selection method in consideration of coal seam crushing degree |
| CN104695935B (en) * | 2013-12-06 | 2017-06-06 | 中国石油天然气集团公司 | A kind of drilling well well location system of selection of consideration coal seam degree of crushing |
| 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 |
| CN108643867A (en) * | 2018-05-21 | 2018-10-12 | 河南工程学院 | Coal extraction coal bed gas technique is drawn in a kind of release, water-jet |
| CN111980642A (en) * | 2020-09-01 | 2020-11-24 | 中联煤层气有限责任公司 | Construction method of coal bed gas multi-branch horizontal well and multi-branch horizontal well |
| CN111980642B (en) * | 2020-09-01 | 2022-04-12 | 中联煤层气有限责任公司 | Construction method of coal bed gas multi-branch horizontal well and multi-branch horizontal well |
| CN114607318A (en) * | 2022-03-24 | 2022-06-10 | 中煤科工集团西安研究院有限公司 | Fracturing cooperative construction method for combined production and drilling of multi-layer horizontal well for deep coal bed methane |
| CN116940745A (en) * | 2023-04-25 | 2023-10-24 | 平安煤矿瓦斯治理国家工程研究中心有限责任公司 | Well type structure for butt joint of coal bed gas at near end of single well field and opening method |
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