CN104912480B - Coal bed gas near-end docks the brill completion method of horizontal well - Google Patents
Coal bed gas near-end docks the brill completion method of horizontal well Download PDFInfo
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- CN104912480B CN104912480B CN201510219581.2A CN201510219581A CN104912480B CN 104912480 B CN104912480 B CN 104912480B CN 201510219581 A CN201510219581 A CN 201510219581A CN 104912480 B CN104912480 B CN 104912480B
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Abstract
The invention discloses a kind of brill completion method of coal bed gas near-end docking horizontal well, this method is realized by following steps：Step 1：Combined by conventional directional tool and complete horizontal well straight well section and increasing hole angle section and UNICOM's docking straight well, setting of casing well cementation completion；Step 2：Three drillings for opening horizontal segment are completed using casing drilling BHA；Step 3：Finishing drilling will be gone out bottom hole assemblies from sleeve pipe by steel wire fishing device.The present invention does not have to drilling during horizontal segment is drilled well, reduce pit shaft swabbing operation, reduce pit shaft quiescent time, drilling well terminates both setting of casings and finished, operating risk is substantially reduced, reduces operating cost, using cased hole completion, fracturing work can be carried out to horizontal segment, improve cbm development benefit.
Description
Technical field
The invention belongs to drilling technology field, and in particular to a kind of brill completion method of coal bed gas near-end docking horizontal well.
Background technology
Horizontal well technology is mainly big with single well controlled reserves as one of most important Means To Increase Production of coal-bed gas exploitation,
Yield is high, and penetration is high, has the well completion section longer than straight well, can produce larger voltage discharging area, and there is hydraulic fracturing to make seam
Can not oriented control and length control, being capable of avoiding obstacles and the advantages that bad environments area.
But the more conventional reservoir modulus of elasticity of coal is low, Poisson's ratio is high, easily causes well and collapses, the wind of coal bed gas horizontal well
Danger is significantly increased with extension, the extension of bore hole hole vacant time of horizontal section length, and this is showed more in weak seam
Prominent, horizontal well drilling cost is big in addition, and horizontal well drilling technique technology has a strong impact on the development benefit of coal bed gas.
The content of the invention
In view of this, it is a primary object of the present invention to provide a kind of coal bed gas near-end docking horizontal well to be drilled well side
Method.
To reach above-mentioned purpose, the technical proposal of the invention is realized in this way：
The embodiment of the present invention provides a kind of brill completion method of coal bed gas near-end docking horizontal well, and this method passes through following step
It is rapid to realize：
Step 1：Combined by conventional directional tool and complete horizontal well straight well section and increasing hole angle section and UNICOM's docking straight well, trapped
Pipe well cementation completion；
Step 2：Three drillings for opening horizontal segment are completed using casing drilling BHA；
Step 3：Finishing drilling will be gone out bottom hole assemblies from sleeve pipe by steel wire fishing device.
In such scheme, in the step 1, the straight well section and increasing hole angle section and docking straight well of horizontal well are by conventional Directional Drilling
Tool is completed, and UNICOM position is located at horizontal well and has just enter into coal seam section, and it is short that the conventional directional tool combination pierces coal seam length.
In such scheme, in the step 2, horizontal segment is crept into using casing drilling technology, and the drill string assembly is
Sleeve pipe, power drilling tool, reamer and drill bit, wherein, the power drilling tool is arranged on inside bottom sleeve, the reamer and brill
Head is arranged in jacket exterior；The power drill has camber.
In such scheme, in the step 3, survey display, geological logging and engineering parameter adjustment by referring to gas and bore disk guarantor
Card drill string is crept into coal seam；Bottom hole assemblies are salvaged using pumping fishing device, or entered using oil pipe connection fisher
Well salvages DHA.
In such scheme, horizontal segment selection sleeve pipe is not cemented the well completion, or selection casing cementing completion.
In such scheme, the casing drilling BHA of horizontal segment bores multiple Multilateral Wells in horizontal segment.
Compared with prior art, beneficial effects of the present invention：The present invention carries out coal bed gas with sleeve pipe directed-drilling technique
Horizontal well horizontal segment is crept into.Specific advantage is as follows：(1) termination of pumping time when being crept into coal seam is reduced, coal seam is effectively supported, avoids
Drilling well swabbing action, reduce horizontal well well slough, bury drilling tool accident；(2) reduce make a trip wait non-cutting time, shortening duty cycle,
Reduce coal bed gas horizontal well drilling cost；(3) horizontal segment uses cased hole completion, can bore Multilateral Wells, and also cased hole completion section can be entered
Row staged fracturing of horizontal well operation, increase coal bed gas parsing area；(4) near-end docking structure is used, conventional BHA is in coal
It is short that length is crept into layer, well safety coefficient height；(5) horizontal segment is surveyed by gas, geology, drilling-time log and curved power drilling tool control
Well track, sleeve pipe only have reamer and drill bit outside, once borehole collapse, which occurs, can propose reamer, drill bit finishing drilling immediately, no
Using the BHA of non-magnetic drilling tool+orientation pipe nipple, avoid in accident due to outside sleeve pipe drilling tool length it is excessive and can not propose
Pit shaft.
Brief description of the drawings
Fig. 1 is the coal bed gas horizontally-butted wells well casing programme of the present invention；
Fig. 2 is the casing drilling BHA of the present invention；
In figure：1. the spud section of horizontal well one, 2. horizontal wells two open straight well section, and 3. horizontal wells two open increasing hole angle section and UNICOM's section,
4. mining straight well, 5. glass reinforced plastic sleeves, 6. reaming hole caves, 7. 3 open horizontal segment, 8. coal seams, 9. casing strings, 10. fishing devices,
11. locking device, 12. power drilling tools, 13. sealing devices, 14. reamers, 15. drill bits.
Embodiment
The present invention is described in detail with reference to the accompanying drawings and detailed description.
The embodiment of the present invention provides a kind of brill completion method of coal bed gas near-end docking horizontal well, as shown in Figure 1, 2, the party
Method is realized by following steps：
Step 1：Combined by conventional directional tool and complete horizontal well straight well section and increasing hole angle section and UNICOM's docking straight well, trapped
Pipe well cementation completion.
Specifically, the straight well section and increasing hole angle section and docking straight well of horizontal well are completed by conventional directional tool, UNICOM position
Coal seam section is had just enter into positioned at horizontal well, it is short that the conventional directional tool combination pierces coal seam length.
The drilling for completing UNICOM's peupendicular hole 4, setting of casing after finishing drilling, in coal seam section tripping in glass are combined using conventional directional tool
Glass steel sleeve 5, reaming hole operation is carried out to fiber glass reinforced plastic cover pipeline section 5 after well cementation time is solidifying, forms reaming hole cave 6；Using conventional drill set
The straight spud section 1 and two of bench drill horizontal well opens straight well section 2, and tripping in routine directional tool combination afterwards carries out increasing hole angle section and UNICOM's section
3 drilling, drilling tool is played out after UNICOM；In peupendicular hole reaming hole cave, section carries out back-up sand, sand face position is higher than coal seam position 1-2m,
Cement injecting is carried out afterwards, and gray columns is highly more than 50 meters；Horizontal well tripping in routine directional tool combined sand-washing again, is rushed to reaming hole cave
Continue after 6 in drilling in coal 10m, setting of casing is cemented the well after circulating fluid pulls out of hole.
Step 2：Three drillings for opening horizontal segment are completed using casing drilling BHA.
Specifically, horizontal segment is crept into using casing drilling technology, the drill string assembly is sleeve pipe, power drilling tool, expansion
Eye device and drill bit, wherein, the power drilling tool is arranged on inside bottom sleeve, and the reamer and drill bit are arranged on outside sleeve pipe
Portion；The power drill has camber.
Two, which open the solidifying rear tripping in casing drilling BHA of time, carries out three drillings for opening the horizontal segment 7 of coal seam 8.Casing drilling underground
Tubing string string includes casing string 9, fishing device 10, locking device 11, power drilling tool 12, sealing device 13, reamer 14, drill bit
15.Power drilling tool 12 is arranged in bottom sleeve, and the lower contact of power drilling tool 12 has certain camber, only reamer 14 and drill bit 15
Exposed to the bottom of casing string 9.Three, which open horizontal segment drilling, is surveyed by gas, geology, drilling-time log and curved power drilling tool and bores disk to control
Well track processed, slipping drilling and compound drilling can be carried out.
Step 3：Finishing drilling will be gone out bottom hole assemblies from sleeve pipe by steel wire fishing device.
Ensure that drill string bores in coal seam specifically, surveying display, geological logging and engineering parameter adjustment by referring to gas and boring disk
Enter；Bottom hole assemblies are salvaged using pumping fishing device, or well is entered using oil pipe connection fisher and salvages down-hole equipment group
Close.
After drilling to completion, bottomhole orientation drill set is closed into out finishing drilling from casing string 9 with steel wire fishing device.
Well head installs steel wire blowout hookup and pumping installations, steel wire fishing device deliver to shaft bottom with pumping mode, if hole deviation is excessive, pump
Delivery method fails, and oil pipe connection fisher can be used to enter well and salvages DHA.
Horizontal segment selection sleeve pipe is not cemented the well completion, or selection casing cementing completion.
The casing drilling BHA of horizontal segment bores multiple Multilateral Wells in horizontal segment.
The present invention first completes the drilling and UNICOM's near-end of horizontal well straight well section and increasing hole angle section using the combination of conventional directional tool
Straight well is docked, setting of casing is cemented the well after finishing drilling, and three open rear tripping in casing drilling BHA, coordinate downhole motor motor and reaming hole
Device, drill bit are crept into, and survey display and geological logging result with reference to gas, adjustment bores disk angle to ensure that drill string bores in coal seam
Enter, be drilled into after design well depth that from sleeve pipe will to go out well head downhole motor, reamer, drill bit with steel wire fishing device complete
Bore.
Therefore, the present invention has the following advantages：Horizontal segment does not have to drilling during being drilled well, reduces pit shaft pumping and makees
Industry, pit shaft quiescent time is reduced, drilling well terminates both setting of casings and finished, substantially reduces operating risk, reduce operating cost, uses
Cased hole completion, fracturing work can be carried out to horizontal segment, improve cbm development benefit；It is conventional to bore using near-end docking structure
Tool combination drilling length in coal seam is short, and well safety coefficient is high；Horizontal segment is surveyed by gas, geology, drilling-time log and curved power drill
Have to control well track, there was only reamer and drill bit outside sleeve pipe, once borehole collapse, which occurs, can propose reamer, drill bit immediately
Finishing drilling, without using the BHA of non-magnetic drilling tool+orientation pipe nipple, avoid in accident due to drilling tool length is excessive outside sleeve pipe and nothing
Method proposes pit shaft.
The foregoing is only a preferred embodiment of the present invention, is not intended to limit the scope of the present invention.
Claims (1)
- A kind of 1. brill completion method of coal bed gas near-end docking horizontal well, it is characterised in that：This method is realized by following steps：Step 1：Completion horizontal well straight well section and increasing hole angle section are combined by conventional directional tool and straight well is docked in UNICOM, setting of casing is solid Well completion；Step 2：Three drillings for opening horizontal segment are completed using casing drilling BHA；Step 3：Finishing drilling will be gone out bottom hole assemblies from sleeve pipe by steel wire fishing device；In the step 1, the straight well section and increasing hole angle section and docking straight well of horizontal well are completed by conventional directional tool, UNICOM position Coal seam section is had just enter into positioned at horizontal well, it is short that the conventional directional tool combination pierces coal seam length；In the step 2, horizontal segment is crept into using casing drilling technology, and the BHA is sleeve pipe, power drilling tool, expansion Eye device and drill bit, wherein, the power drilling tool is arranged on inside bottom sleeve, and the reamer and drill bit are arranged on outside sleeve pipe Portion；The power drill has camber；In the step 3, survey display, geological logging and engineering parameter adjustment brill disk by referring to gas and ensure that drill string bores in coal seam Enter；Bottom hole assemblies are salvaged using pumping fishing device, or well is entered using oil pipe connection fisher and salvages down-hole equipment group Close；Horizontal segment selection sleeve pipe is not cemented the well completion, or selection casing cementing completion；The casing drilling BHA of horizontal segment bores multiple Multilateral Wells in horizontal segment.
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| CN201510219581.2A CN104912480B (en) | 2015-04-30 | 2015-04-30 | Coal bed gas near-end docks the brill completion method of horizontal well |
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| CN201510219581.2A CN104912480B (en) | 2015-04-30 | 2015-04-30 | Coal bed gas near-end docks the brill completion method of horizontal well |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109630023B (en) * | 2018-12-01 | 2024-05-10 | 谭雄卫 | Method for laying horizontal pipeline in weak stratum and ground direction adjusting device |
| 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 |
| CN115059434B (en) * | 2022-05-31 | 2023-12-08 | 中国石油大学(北京) | Development method of coal bed gas horizontal well group |
| 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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| US8297377B2 (en) * | 1998-11-20 | 2012-10-30 | Vitruvian Exploration, Llc | Method and system for accessing subterranean deposits from the surface and tools therefor |
| CN101936142B (en) * | 2010-08-05 | 2012-11-28 | 北京奥瑞安能源技术开发有限公司 | Aerated underbalanced drilling method for coal-bed gas |
| 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 |
| CN102425397A (en) * | 2011-12-29 | 2012-04-25 | 郑州大学 | Method for exploiting coal-bed methane by utilizing water force of horizontal pinnate well of double well-shaft to scour, drill and relieve pressure |
| 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 |
| CN103924944B (en) * | 2013-09-11 | 2017-01-18 | 华北石油管理局 | Well abandoning operation method for coal-bed gas horizontal wells |
| CN104453712A (en) * | 2014-12-03 | 2015-03-25 | 中煤科工集团西安研究院有限公司 | While-drilling sleeve directional drilling device and method for soft coal seams of underground coal mine |
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