CN103924917A - Drilling construction method for coal-bed gas multi-branch horizontal wells - Google Patents
Drilling construction method for coal-bed gas multi-branch horizontal wells Download PDFInfo
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- CN103924917A CN103924917A CN201310408922.1A CN201310408922A CN103924917A CN 103924917 A CN103924917 A CN 103924917A CN 201310408922 A CN201310408922 A CN 201310408922A CN 103924917 A CN103924917 A CN 103924917A
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Abstract
The invention discloses a drilling construction method for coal-bed gas multi-branch horizontal wells, and belongs to the field of coal-bed gas exploitation. The drilling construction method for the coal-bed gas multi-branch horizontal wells is characterized by comprising steps of (1), drilling main mudstone sections by the aid of mud to communicate the main mudstone sections with vertical wells, preparing front spacer fluid, back spacer fluid and fluidic chemical wall fixing agents for sealing well section volume on the ground, sequentially substituting the front spacer fluid, the fluidic chemical wall fixing agents and the rear spacer fluid into well sections of main holes of the sealed horizontal wells by the aid of mud, and pressurizing cracks of filled mudstone rock strata to reinforce well walls; (2), drilling branch mudstone sections by the aid of mud, stopping drilling the branch mudstone sections when coal is discovered, circulating the mud by the aid of clear water, replacing the mud in the wells and placing the mud outside the well mouths, continuing to drill the branch mudstone sections until coal-bed sections are completely drilled and constructed, withdrawing to the main well sections, reaching next lateral drill points, circulating the mud into the wells and replacing clear water and starting to laterally drill next branches. The drilling construction method has the advantages that the stability of mudstone can be improved, the stability of the holes can be enhanced, the problem of debris carrying can be effectively solved, and coal beds can be effectively protected.
Description
Technical field
The present invention relates to a kind of coal bed gas horizontal well wellbore construction method, belong to coal-bed gas exploitation field.
Background technology
Coal bed gas multi-branch horizontal is the main well type of exploitation coal bed gas resource, while conventionally drilling Zhu Zhihe branch in coal seam reservoirs during site operation, use clear water, because having property of coal seam is crisp, easily collapse, so cave in when creeping into coal seam, the accident rate such as bit freezing is higher.Meanwhile, when down-hole instrument failure and other reason occur need to pull out of hole, if the incomplete well eye of again reentrying continues to creep into, very easily mark new well and can not enter again old well.
Summary of the invention
The object of this invention is to provide a kind of coal bed gas multi-branch horizontal wellbore construction method, to guarantee the stability of well.
The object of the invention is to realize by following proposal: a kind of coal bed gas multi-branch horizontal wellbore construction method, it is characterized in that, comprise the following steps:
(1) using mud first to drill a main mud stone section is communicated with straight well, ground prepares the solid wall agent of aqueous chemical of front and back insulating liquid and institute's sealing well section volume use immediately, press successively preflush spacer fluid, the solid wall agent of aqueous chemical and rearmounted insulating liquid, use mud to replace into the sealing horizontal well master of institute and prop up wellbore section, suppress filling mud stone formation fractures Reinforcing Shaft;
(2) using mud to carry out branch's mud stone section creeps into, after seeing coal, stop creeping into, with clear water circulation, mud in well is replaced out to well head, continue to creep into until complete the drilling construction of coal seam section, return main to next side tracking point, again mud circulation is replaced out to clear water in well, start next branch sidetracking, repeat above-mentioned steps, each branch has been crept into by a main distal-to-proximal order successively, thereby completes full well construction.
The invention has the beneficial effects as follows: the present invention carries out Gu Bi processing by master's mud stone section, improves the stability of mud stone well, reaches the function that replaces bushing pipe.Zhu Zhihe branch mud stone section is used mud as circulatory mediator, and the coal seam section of vulnerable to pollution is used clear water as circulatory mediator, efficiently solves hole stability, landwaste carries and coal seam protection problem.
Accompanying drawing explanation
Accompanying drawing is the structural representation of coal bed gas multi-branch horizontal.
In figure: 1. horizontal well; 2. first straight well; 3. second mouthful of straight well; 4. first cave; 5. second cave; 6. first branch; 7. second branch; 8.San Ge branch; 9.Si Ge branch; 10.Wu Ge branch; 11.Liu Ge branch.
The specific embodiment
Below in conjunction with specific embodiment, just the present invention is described further.Accompanying drawing can be used as the structural representation of the present embodiment coal bed gas multi-branch horizontal.
Horizontal well well group has first straight well (2) and second mouthful of straight well (3) to form with a bite multi-branched horizontal well (1), complete in advance the construction of two mouthfuls of straight wells, use mud drilling to complete multi-branched horizontal well master and prop up horizontal hole and be connected with first cave (4) and second cave (5).The master that drilling tool is return between two caves props up well section, the solid wall agent of aqueous chemical of each configuration front and back insulating liquid of 25-30 meters of volumes of horizontal hole and institute's sealing well section volume use is pressed on ground, press successively preflush spacer fluid, the solid wall agent of aqueous chemical and rearmounted insulating liquid, use mud to replace into main horizontal hole of institute's sealing, suppress to pressure P, wherein pressure P can not surpass the fracture pressure on stratum, voltage stabilizing 30 minutes, if pressure drop, carry out ftercompction, by pressure surely to P, after completing, trip out drilling tool, wait solidifying 24 hours, being lowered to drilling tool bores the solid wall agent of main Zhi Duoyu, recycle well head.
Further, use mud sidetracking to bore the mud stone ab section of first branch (6), see that coal stops creeping into, clear water is recycled into well and replaces out mud, after being full of clear water circulation normally in well, start to proceed coal seam section and creep into until complete branch's drilling depth.Drilling tool is return main, to next branch side tracking point, mud circulation is entered to well and replace out clear water, until being full of mud circulation in well, start second branch of sidetracking (7) after normal, repeat the drilling operation that above step completes branch (8), (9), (10), (11).
Claims (1)
1. a coal bed gas multi-branch horizontal wellbore construction method, is characterized in that, comprises the following steps:
(1) using mud first to drill a main mud stone section is communicated with straight well, ground prepares the solid wall agent of aqueous chemical of front and back insulating liquid and institute's sealing well section volume use immediately, press successively preflush spacer fluid, the solid wall agent of aqueous chemical and rearmounted insulating liquid, use mud to replace into the sealing horizontal well master of institute and prop up wellbore section, suppress filling mud stone formation fractures Reinforcing Shaft;
(2) using mud to carry out branch's mud stone section creeps into, after seeing coal, stop creeping into, with clear water circulation, mud in well is replaced out to well head, continue to creep into until complete the drilling construction of coal seam section, return main to next side tracking point, again mud circulation is replaced out to clear water in well, start next branch sidetracking, repeat above-mentioned steps, each branch has been crept into by a main distal-to-proximal order successively, thereby completes full well construction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310408922.1A CN103924917A (en) | 2013-09-11 | 2013-09-11 | Drilling construction method for coal-bed gas multi-branch horizontal wells |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201310408922.1A CN103924917A (en) | 2013-09-11 | 2013-09-11 | Drilling construction method for coal-bed gas multi-branch horizontal wells |
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| CN103924917A true CN103924917A (en) | 2014-07-16 |
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| CN201310408922.1A Pending CN103924917A (en) | 2013-09-11 | 2013-09-11 | Drilling construction method for coal-bed gas multi-branch horizontal wells |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104790915A (en) * | 2015-04-22 | 2015-07-22 | 西南石油大学 | Coal bed methane recovery method |
| CN104912480A (en) * | 2015-04-30 | 2015-09-16 | 中煤科工集团西安研究院有限公司 | Drilling and completion method for coal bed gas near-end butt-joint horizontal well |
| CN104912479A (en) * | 2015-04-30 | 2015-09-16 | 中煤科工集团西安研究院有限公司 | Method for drilling and completion of horizontal branched well for coal bed gas |
| CN107237602A (en) * | 2016-03-28 | 2017-10-10 | 中国石油化工股份有限公司 | Boring method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104790915A (en) * | 2015-04-22 | 2015-07-22 | 西南石油大学 | Coal bed methane recovery method |
| CN104912480A (en) * | 2015-04-30 | 2015-09-16 | 中煤科工集团西安研究院有限公司 | Drilling and completion method for coal bed gas near-end butt-joint horizontal well |
| CN104912479A (en) * | 2015-04-30 | 2015-09-16 | 中煤科工集团西安研究院有限公司 | Method for drilling and completion of horizontal branched well for coal bed gas |
| CN107237602A (en) * | 2016-03-28 | 2017-10-10 | 中国石油化工股份有限公司 | Boring method |
| CN107237602B (en) * | 2016-03-28 | 2019-10-11 | 中国石油化工股份有限公司 | Boring method |
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Application publication date: 20140716 |