CN104912479A - 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 PDFInfo
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- CN104912479A CN104912479A CN201510218344.4A CN201510218344A CN104912479A CN 104912479 A CN104912479 A CN 104912479A CN 201510218344 A CN201510218344 A CN 201510218344A CN 104912479 A CN104912479 A CN 104912479A
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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
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 is as one of most important Means To Increase Production of coal-bed gas exploitation, mainly there is single well controlled reserves large, output is high, penetration is high, there is the well completion section longer than straight well, larger voltage discharging area can be produced, have fracturing make seam can not oriented control and the advantage such as cut to lengthen.
But comparatively conventional reservoir modulus of elasticity is low, poisson's ratio is high for coal, well is easily caused to collapse, the risk of coal bed gas horizontal branch well obviously increases along with the extension of horizontal section length, the prolongation of bore hole hole vacant time, this is more outstanding weak seam performance, in addition horizontal well branch drilling cost is large, and horizontal well branch hole drilling technology has a strong impact on the development benefit of coal bed gas.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of coal bed gas horizontal branch well to bore completion method.
For achieving the above object, technical scheme of the present invention is 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 realized by following steps:
Step 1: the game clock interval, two adopting conventional drilling assembly to complete horizontal branch well opens creeping into of straight well section and increasing hole angle section, setting of casing well cementation after finishing drilling;
Step 2: three open coal seam horizontal segment adopts casing drilling drilling assembly to creep into, and from sleeve pipe, bottomhole orientation drilling assembly is tripped out finishing drilling after being drilled into design well depth with steel wire fishing device;
Step 3: under enter ultra-short radius radially horizontal well drilling tool, carry out creeping into of Multilateral Wells in milling sleeve pipe and coal seam.
In such scheme, in described step 1, straight well section and the increasing hole angle section of horizontal well have been combined by conventional directional tool, 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 drilling assembly, when the finishing drilling layer position of increasing hole angle section 3 be not or not coal seam 6, three open first pierce coal seam 6 by the combination of conventional directional tool after enter down sleeve pipe directional tool again and combine creeping into of horizontal segment, three end bore after by pumping fishing device salvaging bottom hole assemblies.
In such scheme, described drilling assembly adopts bottom hole assemblies, or adopts the drilling well combination of drilling rod, hanger, sleeve pipe and bottom hole assemblies.
In such scheme, in described step 3, super short radius well drilling technology is adopted to carry out creeping into of Multilateral Wells.
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 and far-end or near-end mining straight well are connected.
Compared with prior art, beneficial effect of the present invention:
The present invention uses Casing Drilling Technique to carry out coal bed gas horizontal well horizontal segment and creeps into, ultra-short radius drilling technology is adopted to carry out creeping into of Multilateral Wells, concrete advantage is as follows: (1) reduces termination of pumping time when coal seam main borehole creeps into, effective support coal seam, avoid drilling well swabbing action, reduce horizontal well well slough, bury drilling tool accident; (2) greatly simplify branch hole drilling technique, reduce branch well drilling air intake danger, shorten duty cycle, reduce coal bed gas branch drilling cost.
Accompanying drawing explanation
Fig. 1 is 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. lateral wellbore, 6. coal seam.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
The present invention first uses conventional drilling assembly to complete creeping into of horizontal well one game clock interval and Erkaijing well, setting of casing well cementation after finishing drilling, finishing drilling layer position is positioned at the position of coal seam or Approaching Coal Seam, three open horizontal segment adopts the combination of sleeve pipe directional tool to creep into, bottomhole orientation drilling assembly is tripped out from sleeve pipe with steel wire fishing device after being drilled into design well depth, adopt ultra-short radius drilling technology to carry out creeping into of Multilateral Wells afterwards, be finally drilled to fish bone well horizontal branch well.
The embodiment of the present invention provides a kind of coal bed gas horizontal branch well to bore completion method, and as shown in Figure 1, the method is realized by following steps:
Step 1: the game clock interval, two adopting conventional drilling assembly to complete horizontal branch well opens creeping into of straight well section 2 and increasing hole angle section 3, setting of casing well cementation after finishing drilling;
Concrete, horizontal well straight well section comprise a game clock layer well section 1 and two open straight well section 2, end bore following table cover after carry out well cementing operation, two open increasing hole angle 3 sections uses guide drilling to creep into, finishing drilling position coal seam 6 or near in top board, enter protective casing under after finishing drilling 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 near coal seam 6 or roof.
Step 2: three open coal seam horizontal segment adopts casing drilling drilling assembly to creep into, and from sleeve pipe, bottomhole orientation drilling assembly is tripped out finishing drilling after being drilled into design well depth with steel wire fishing device;
Concrete, three exploitation sleeve pipe directional tool combinations are crept into.Casing drilling down-hole string string comprises drill bit and reamer is connected, reamer upper end is connected with damper/liquid and pushes away, top is connected with power drilling tool, power drilling tool and orientation are without magnetic short section and non-magnetic drilling tool, non-magnetic drilling tool upper end and locking device are connected, and DHA is locked in bottom casing string by locking device.The mode of creeping into can take compound drilling and slipping drilling mode.After drilling to completion, from sleeve pipe, bottomhole orientation drilling assembly is tripped out finishing drilling with steel wire fishing device.Install steel wire blowout hookup and pumping installations at well head, steel wire fishing device pumping mode delivers to shaft bottom, if hole deviation is excessive, pumping method failure, can use oil pipe to connect fisher and enter well salvaging DHA.
Horizontal segment is crept into by casing drilling drilling assembly, when the finishing drilling layer position of increasing hole angle section 3 be not or not coal seam 6, three open first pierce coal seam 6 by the combination of conventional directional tool after enter down sleeve pipe directional tool again and combine creeping into of horizontal segment, three end bore after by pumping fishing device salvaging bottom hole assemblies.
Described drilling assembly adopts bottom hole assemblies, or adopts the drilling well combination of drilling rod, hanger, sleeve pipe and bottom hole assemblies.
Step 3: under enter ultra-short radius radially horizontal well drilling tool, carry out creeping into of Multilateral Wells in milling sleeve pipe and coal seam.
Concrete, first enter guider down, capital equipment comprises guider, universal drive shaft etc., and guider is connected with oil pipe lower end, and logical rig machine is by guider lower going-into-well, in whole radial direction well operation process, down-hole guider in sleeve pipe, determines the azimuth of down-hole guider by oil pipe suspension by gyroscope or other instruments, ground brill dish drives guider adjustment azimuth, down-hole by rotation pipeline, want quiet run when transferring, lower pipe speeds control is at 20m/min.Casing sidetracking, capital equipment comprises screw motor, universal drive shaft, to window drill bit etc., equipment is connected with coiled tubing, enter under from oil pipe, under after projected depth, window drill bit and universal drive shaft is guided by down-hole guide, by vertical with oil pipe parallel steer, to window bit contact sleeve pipe position to be drilled, start ground high-pressure pump, drilling parameter: pump pressure 28-43MPa, discharge capacity 0.75-0.85L/s, cleaner for high-pressure drilling fluid is delivered to down-hole screw motor by coiled tubing, start casing sidetracking, along with creeping into of sleeve pipe, ground control system transfers continuous-tube, complete the operation of windowing of sleeve pipe.Bore branch well hole, enter in oil pipe by coiled tubing by under self-driven flow jet flow drill, start ground high-pressure pump, self-driven flow jet flow drill utilizes the corrosion function of high-speed jet to realize formation and breaks rock, boring, the active force produced between the high-speed jet that self-driven flow jet flow drill sprays backward and drill hole inner wall is that drill bit and creeping into smoothly of coiled tubing provide motive force, drilling parameter is pump pressure 57MPa, discharge capacity 0.52L/s, radial hydraulic jet creeps into 100m, trip out coiled tubing and self-driven flow jet flow drill, again carry on or below tubing string, rotary drilling dish, determine the azimuth of down-hole guider, bore next branch well hole, finally complete the drillng operation of radial well section.
Super short radius well drilling technology is adopted 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 and far-end or near-end mining straight well are connected.
The embodiment of the present invention provides a kind of brill completion method of coal bed gas horizontal branch well, first use conventional drilling assembly to complete 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 the position of coal seam or Approaching Coal Seam, three open horizontal segment adopts the combination of sleeve pipe directional tool to creep into, bottomhole orientation drilling assembly is tripped out from sleeve pipe with steel wire fishing device after being drilled into design well depth, adopt ultra-short radius drilling technology to carry out creeping into of Multilateral Wells afterwards, be 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, and effectively supports coal seam, avoids drilling well swabbing action, reduces horizontal well well slough, buries drilling tool accident; (2) greatly simplify branch hole drilling technique, reduce branch well drilling air intake danger, shorten duty cycle, reduce coal bed gas branch drilling cost.
The above, be only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.
Claims (7)
1. coal bed gas horizontal branch well bores a completion method, and it is characterized in that, the method is realized by following steps:
Step 1: the game clock interval (1), two adopting conventional drilling assembly to complete horizontal branch well opens creeping into of straight well section (2) and increasing hole angle section (3), setting of casing well cementation after finishing drilling;
Step 2: three open coal seam horizontal segment adopts casing drilling drilling assembly to creep into, and from sleeve pipe, bottomhole orientation drilling assembly is tripped out finishing drilling after being drilled into design well depth with steel wire fishing device;
Step 3: under enter ultra-short radius radially horizontal well drilling tool, carry out creeping into of Multilateral Wells in milling sleeve pipe and coal seam.
2. coal bed gas horizontal branch well according to claim 1 bores completion method, it is characterized in that: in described step 1, 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 near coal seam (6) or roof.
3. coal bed gas horizontal branch well according to claim 1 bores completion method, it is characterized in that: in described step 2, horizontal segment is crept into by casing drilling drilling assembly, when the finishing drilling layer position of increasing hole angle section (3) be not when coal seam (6), three open first pierce coal seam (6) by the combination of conventional directional tool after enter down sleeve pipe directional tool again and combine creeping into of horizontal segment, three end bore after by pumping fishing device salvaging bottom hole assemblies.
4. coal bed gas horizontal branch well according to claim 3 bores completion method, it is characterized in that: described drilling assembly adopts bottom hole assemblies, or adopts the drilling well combination of drilling rod, hanger, sleeve pipe and bottom hole assemblies.
5. coal bed gas horizontal branch well according to claim 1 bores completion method, it is characterized in that: in described step 3, adopts super short radius well drilling technology to carry out creeping into of Multilateral Wells.
6. coal bed gas horizontal branch well according to claim 1 bores completion method, it is characterized in that: three open horizontal segment selects sleeve pipe not cement the well completion, or selects casing cementing completion.
7. a kind of coal bed gas horizontal branch well according to claim 1 bores completion method, it is characterized in that: branch horizontal well and far-end or near-end mining straight well are connected.
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Cited By (7)
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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 |
| CN109630023A (en) * | 2018-12-01 | 2019-04-16 | 谭雄卫 | In the method and ground device for regulating direction of soft stratum laying horizontal pipe |
| WO2020049473A1 (en) | 2018-09-06 | 2020-03-12 | Geohidroterv Kft. | Jet-system pipe laying procedure and device for implementing the procedure |
| CN111119748A (en) * | 2019-12-13 | 2020-05-08 | 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 |
| CN111485826A (en) * | 2020-04-07 | 2020-08-04 | 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 |
| CN112780248A (en) * | 2019-11-04 | 2021-05-11 | 中国石油天然气股份有限公司 | Coal bed gas horizontal well and construction method thereof |
| 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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| 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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