CN104912479B - Method for drilling and completion of horizontal branched well for coal bed gas - Google Patents

Method for drilling and completion of horizontal branched well for coal bed gas Download PDF

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Publication number
CN104912479B
CN104912479B CN201510218344.4A CN201510218344A CN104912479B CN 104912479 B CN104912479 B CN 104912479B CN 201510218344 A CN201510218344 A CN 201510218344A CN 104912479 B CN104912479 B CN 104912479B
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well
drilling
horizontal
coal bed
section
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CN104912479A (en
Inventor
庞涛
姜在炳
韩保山
降文萍
李彬刚
杜新峰
王晶
乔康
周加佳
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Xian Research Institute Co Ltd of CCTEG
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Xian Research Institute Co Ltd of CCTEG
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Abstract

The invention discloses a method for drilling and completion of a horizontal branched well for coal bed gas. The method comprises the following steps: step 1: drilling a first-opening surface layer section, a second-opening straight well section and an incline angle buildup section of the horizontal branched well by adopting a conventional drilling tool combination, and after finishing drilling, arranging casing pipes so as to fix the well; step 2: drilling a third-opening coal bed horizontal section by adopting a casing pipe well drilling tool combination until a designed well depth is reached, and pulling out a directional drilling tool combination at the bottom of the well from the casing pipe with a steel wire fishing device; and step 3: adopting a radial lateral well drilling tool with a super-short radius so as to mill the casing pipe and drill the branched well in a coal bed. According to the method disclosed by the invention, pumping termination time can be shortened during drilling a main well hole of the coal bed, the coal bed can be effectively supported, the swabbing effect of well drilling is avoided, and accidents of collapse of a horizontal well and burying of the drilling tools are reduced; a well drilling technology of the branched well is greatly simplified, the well drilling risk of the branched well is reduced, the operation period is shortened, and the cost of drilling the branched well for the coal bed gas is reduced.

Description

Coal bed gas horizontal branch well bores completion method
Technical field
The invention belongs to drilling technology field, be specifically related to a kind of coal bed gas horizontal branch well and bore completion method.
Background technology
Horizontal branch well technology, as one of most important Means To Increase Production of coal-bed gas exploitation, mainly has individual well control Reserves processed are big, and yield is high, and penetration is high, has the well completion section more longer than straight well, it is possible to produce bigger letting out Nip, has fracturing and makes advantages such as stitching the oriented control do not caned and length control.
But coal more conventional reservoir elastic modelling quantity is low, Poisson's ratio is high, easily causes well and collapses, coal seam air water The risk of flat Multilateral Wells significantly increases along with extension, the prolongation of bore hole hole vacant time of horizontal section length, this Point is the most prominent weak seam performance, and horizontal well branch drilling cost is big in addition, horizontal well branch well drilling Well technology has a strong impact on the development benefit of coal bed gas.
Summary of the invention
In view of this, a kind of coal bed gas horizontal branch well of offer is provided and bores completion method.
For reaching above-mentioned purpose, the technical scheme is that and be achieved in that:
The embodiment of the present invention provides a kind of coal bed gas horizontal branch well to bore completion method, and the method is by following step Rapid realization:
Step 1: use conventional BHA complete a game clock interval of horizontal branch well, two open straight well section and Creeping into of increasing hole angle section, setting of casing well cementation after finishing drilling;
Step 2: three open coal seam horizontal segment uses casing drilling BHA to creep into, and is drilled into design well depth From sleeve pipe, bottomhole orientation BHA is tripped out finishing drilling with steel wire fishing device afterwards;
Step 3: under enter super short radius Horizontal Well Drilling well tool, carry out branch in milling sleeve pipe and coal seam Creeping into of well.
In such scheme, in described step 1, the straight well section of horizontal well and increasing hole angle section are by conventional directional tool group Conjunction completes, and finishing drilling layer position is positioned near coal seam or roof.
In such scheme, in described step 2, horizontal segment is crept into by casing drilling BHA, when The finishing drilling layer position of increasing hole angle section 3 be not when coal seam 6, and three open and first pass through the combination of conventional directional tool and pierce coal seam 6 After enter down sleeve pipe directional tool and combined creeping into of horizontal segment, three end brill after beat with pumping fishing device Drag for bottom hole assemblies.
In such scheme, described BHA use bottom hole assemblies, or use drilling rod, hanger, The drilling well combination of sleeve pipe and bottom hole assemblies.
In such scheme, in described step 3, super short radius well drilling technology is used to carry out Multilateral Wells Creep into.
In such scheme, three open horizontal segment selects sleeve pipe not cement the well completion, or selects casing cementing completion.
In such scheme, branch horizontal well is connected with far-end or near-end mining straight well.
Compared with prior art, beneficial effects of the present invention:
The present invention uses Casing Drilling Technique to carry out coal bed gas horizontal well horizontal segment and creeps into, and uses ultra-short radius to bore Well technology carries out creeping into of Multilateral Wells, and concrete advantage is as follows: (1) reduces termination of pumping when coal seam main borehole creeps into Time, effectively support coal seam, it is to avoid drilling well swabbing action, reduce horizontal well well slough, bury drilling tool accident;(2) It is greatly simplified branch hole drilling technique, reduces branch well drilling air intake danger, shorten duty cycle, reduce coal bed gas Branch's drilling cost.
Accompanying drawing explanation
Fig. 1 is the coal bed gas horizontal branch well casing programme of the present invention;
In figure: 1. a game clock layer well section, 2. two open straight well section, 3. two open increasing hole angle section, 4. three spud sections, 5. point Prop up well well, 6. coal seam.
Detailed description of the invention
The present invention is described in detail with detailed description of the invention below in conjunction with the accompanying drawings.
The present invention first uses conventional BHA to complete creeping into of horizontal well one game clock interval and Erkaijing well, complete Setting of casing well cementation after brill, finishing drilling layer position is positioned at the position of coal seam or Approaching Coal Seam, and three open horizontal segment uses sleeve pipe Directional tool combination is crept into, and uses steel wire fishing device by bottomhole orientation drilling tool from sleeve pipe after being drilled into design well depth Combination trips out, and uses ultra-short radius drilling technology to carry out creeping into of Multilateral Wells afterwards, is finally drilled to fish bone well water Flat Multilateral Wells.
The embodiment of the present invention provides a kind of coal bed gas horizontal branch well to bore completion method, as it is shown in figure 1, the party Method is realized by following steps:
Step 1: use conventional BHA to complete a game clock interval of horizontal branch well, two open straight well section 2 With creeping into of increasing hole angle section 3, setting of casing well cementation after finishing drilling;
Concrete, horizontal well straight well section includes that a game clock layer well section 1 and two opens straight well section 2, and one ends under brill Carrying out well cementing operation after table set, two open increasing hole angle 3 sections uses guide drilling to creep into, and finishing drilling position exists In coal seam 6 or neighbouring top board, after finishing drilling under enter protective casing and cement the well.
Straight well section 2 and the increasing hole angle section 3 of horizontal well have been combined by conventional directional tool, and finishing drilling layer position is positioned at coal Near layer 6 or roof.
Step 2: three open coal seam horizontal segment uses casing drilling BHA to creep into, and is drilled into design well depth From sleeve pipe, bottomhole orientation BHA is tripped out finishing drilling with steel wire fishing device afterwards;
Concrete, three exploitation sleeve pipe directional tool combinations are crept into.Casing drilling down-hole string string includes drill bit Being connected with reamer, reamer upper end couples has amortisseur/liquid to push away, and top is connected with power drilling tool, power Drilling tool and orientation are without magnetic short section and non-magnetic drilling tool, and non-magnetic drilling tool upper end is connected with locking device, locking device DHA is locked in bottom casing string.The mode of creeping into can take compound drilling and slipping drilling mode. After drilling to completion, from sleeve pipe, bottomhole orientation BHA is tripped out finishing drilling with steel wire fishing device.? Well head installs steel wire blowout hookup and pumping installations, and steel wire fishing device pumping mode delivers to shaft bottom, if Hole deviation is excessive, pumping method failure, oil pipe can be used to connect fisher and enter well salvaging DHA.
Horizontal segment is crept into by casing drilling BHA, when the finishing drilling layer position of increasing hole angle section 3 be not or not coal seam When 6, three open to first pass through and enter down sleeve pipe directional tool after the combination of conventional directional tool pierces coal seam 6 and combined Becoming creeping into of horizontal segment, three end use pumping fishing device salvaging bottom hole assemblies after brill.
Described BHA uses bottom hole assemblies, or uses drilling rod, hanger, sleeve pipe and shaft bottom to bore The drilling well combination of tool combination.
Step 3: under enter super short radius Horizontal Well Drilling well tool, carry out branch in milling sleeve pipe and coal seam Creeping into of well.
Concrete, entering down guider, capital equipment includes guider, universal drive shaft etc., guider and oil pipe Lower end is connected, and logical rig machine is directed in device lower going-into-well, and in whole radial direction well operation process, down-hole guides Device in sleeve pipe, determines the azimuth of down-hole guider by oil pipe suspension by gyroscope or other instruments, Ground brill dish drives down-hole guider to adjust azimuth by rotation pipeline, wants quiet run, down tube when transferring Speed controlling is at 20m/min.Casing sidetracking, capital equipment includes screw motor, universal drive shaft, drill bit of windowing Deng, equipment is connected with coiled tubing, from oil pipe under enter, under to after projected depth, the drill bit and universal of windowing Axle is guided by down-hole guide, by vertical with oil pipe parallel steer, and bit contact sleeve pipe position to be drilled of windowing, Starting ground high-pressure pump, drilling parameter: pump pressure 28-43MPa, discharge capacity 0.75-0.85L/s, coiled tubing will Cleaner for high-pressure drilling fluid is delivered to down-hole screw motor, starts casing sidetracking, and along with creeping into of sleeve pipe, ground controls System transfers pipe continuously, completes the operation of windowing of sleeve pipe.Bore branch well hole, by coiled tubing by self-driven Entering under flow jet flow drill in oil pipe, start ground high-pressure pump, self-driven flow jet flow drill utilizes the erosion of high-speed jet Effect realizes breaking stratum rock, boring, high-speed jet that self-driven flow jet flow drill sprays backward and drill hole inner wall Between the active force that produces be drill bit and creeping into smoothly of coiled tubing provides motive force, drilling parameter is pump pressure 57MPa, discharge capacity 0.52L/s, radially hydraulic jet creeps into 100m, trips out coiled tubing and self-driven jet Drill bit, again on carry or lower section tubing string, rotary drilling dish, determine the azimuth of down-hole guider, bore next Individual branch well hole, is finally completed the drillng operation of radial well section.
Super short radius well drilling technology is used to carry out creeping into of Multilateral Wells.
Three open horizontal segment selects sleeve pipe not cement the well completion, or selects casing cementing completion.
Branch horizontal well is connected with far-end or near-end mining straight well.
The embodiment of the present invention provides the brill completion method of a kind of coal bed gas horizontal branch well, first uses conventional drilling tool Having combined horizontal well one to open and the creeping into of Erkaijing well, setting of casing well cementation after finishing drilling, finishing drilling layer position is positioned at coal Layer or the position of Approaching Coal Seam, three open horizontal segment uses the combination of sleeve pipe directional tool to creep into, and is drilled into design well depth From sleeve pipe, bottomhole orientation BHA is tripped out with steel wire fishing device afterwards, use ultra-short radius drilling well afterwards Technology carries out creeping into of Multilateral Wells, is finally drilled to fish bone well horizontal branch well.
Therefore, the present invention has the following advantages: (1) reduces termination of pumping time when coal seam main borehole creeps into, effectively Support coal seam, it is to avoid drilling well swabbing action, reduce horizontal well well slough, bury drilling tool accident;(2) it is greatly simplified Branch hole drilling technique, reduces branch well drilling air intake danger, shortens duty cycle, reduce the drilling well of coal bed gas branch Cost.
The above, only presently preferred embodiments of the present invention, it is not intended to limit the protection model of the present invention Enclose.

Claims (2)

1. a coal bed gas horizontal branch well bores completion method, it is characterised in that the method is realized by following steps:
Step 1: using conventional directional tool combine a game clock interval (1) of horizontal branch well, two opened creeping into of straight well section (2) and increasing hole angle section (3), after finishing drilling, setting of casing is cemented the well;
Step 2: three open coal seam horizontal segment uses casing drilling BHA to creep into, and from sleeve pipe, bottomhole orientation BHA is tripped out finishing drilling with steel wire fishing device after being drilled into design well depth;
Step 3: under enter super short radius Horizontal Well Drilling well tool, carry out creeping into of Multilateral Wells in milling sleeve pipe and coal seam;
In described step 1, the two of horizontal well open straight well section (2) and increasing hole angle section (3) and have been combined by conventional directional tool, and finishing drilling layer position is positioned near coal seam (6) or roof;
In described step 2, horizontal segment is crept into by casing drilling BHA, when the finishing drilling layer position of increasing hole angle section (3) be not in coal seam (6), three open and first pass through to enter down after the combination of conventional directional tool pierces coal seam (6) sleeve pipe directional tool and combine creeping into of horizontal segment, and three end after brill by pumping fishing device salvaging bottom hole assemblies;
In described step 3, super short radius well drilling technology is used to carry out creeping into of Multilateral Wells;
Three open horizontal segment selects sleeve pipe not cement the well completion, or selects casing cementing completion;
Branch horizontal well is connected with far-end or near-end mining straight well.
Coal bed gas horizontal branch well the most according to claim 1 bores completion method, it is characterised in that: described conventional directional tool combination uses bottom hole assemblies, or uses the drilling well combination of drilling rod, hanger, sleeve pipe and bottom hole assemblies.
CN201510218344.4A 2015-04-30 2015-04-30 Method for drilling and completion of horizontal branched well for coal bed gas Active CN104912479B (en)

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CN105421997A (en) * 2015-10-26 2016-03-23 中国石油集团西部钻探工程有限公司 Coal bed methane horizontal well expansion pipe drilling and completion method
HU231179B1 (en) 2018-09-06 2021-06-28 Geohidroterv Kft. Method and apparatus for jet pipeline laying
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
CN111119748B (en) * 2019-12-13 2021-03-30 中煤科工集团重庆研究院有限公司 Method for installing anti-collapse pipe at horizontal well section of L-shaped ground well in mining area
CN111485826B (en) * 2020-04-07 2021-07-27 中煤科工集团西安研究院有限公司 Coal mine underground directional drilling branch hole sidetracking device and method
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

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CN102518411A (en) * 2011-12-29 2012-06-27 郑州大学 Method for mining coal bed gas by hydraulic washout of butted well in manner of pressure relief
CN103161440A (en) * 2013-02-27 2013-06-19 中联煤层气国家工程研究中心有限责任公司 Single-well coalbed methane horizontal well system and finishing method thereof
CN103422813B (en) * 2013-08-02 2015-11-25 奥瑞安能源国际有限公司 Individual well eye multi-lateral horizontal well system for coal bed gas and boring 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
CN104196453B (en) * 2014-08-29 2017-02-15 富地柳林燃气有限公司 Coalbed methane development well
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

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