CN104912480A - Drilling and completion method for coal bed gas near-end butt-joint horizontal well - Google Patents
Drilling and completion method for coal bed gas near-end butt-joint horizontal well Download PDFInfo
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- CN104912480A CN104912480A CN201510219581.2A CN201510219581A CN104912480A CN 104912480 A CN104912480 A CN 104912480A CN 201510219581 A CN201510219581 A CN 201510219581A CN 104912480 A CN104912480 A CN 104912480A
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Abstract
The invention discloses a drilling and completion method for a coal bed gas near-end butt-joint horizontal well. The method is realized by the following steps: step 1: completing parallel communication between a straight well section and a building up section of a horizontal well by a conventional positioning drilling assembly to realize butt joint with a straight well, and carrying out well cementing and completion by run casing; step 2: adopting a sleeve drilling assembly to complete drilling of a three-part horizontal section; and step 3: pulling out a bottomhole drilling assembly from a sleeve by a steel wire salvaging device to finish drilling. According to the drilling and completion method, a drill is not required to pull down in a drilling and completion process of the horizontal section, so that well shaft swabbing operation is reduced, shaft quiescent time is reduced, run casing is completed after drilling is ended, operation risks are greatly reduced, operation cost is reduced, run casing is adopted for well completion, fracturing operation can be carried out on the horizontal section, and coal bed gas exploitation benefits are improved.
Description
Technical field
The invention belongs to drilling technology field, be specifically related to the brill completion method of a kind of coal bed gas near-end docking horizontal well.
Background technology
Horizontal 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 cut to lengthen, can the advantage such as avoiding obstacles and bad environments area.
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 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 drilling cost is large, and horizontal well drilling technique 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 near-end to dock the brill completion method of horizontal well.
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 near-end to dock the brill completion method of horizontal well, and the method is realized by following steps:
Step 1: combined horizontal well straight well section and increasing hole angle section by conventional directional tool and UNICOM's docking straight well, setting of casing well cementation completion;
Step 2: adopt casing drilling drilling assembly to complete three and open creeping into of horizontal segment;
Step 3: from sleeve pipe, bottom hole assemblies is tripped out finishing drilling by steel wire fishing device.
In such scheme, in described step 1, the straight well section of horizontal well and increasing hole angle section and docking straight well are completed by conventional directional tool, and UNICOM position is positioned at horizontal well and has just entered coal seam section, and it is short that described conventional directional tool combination pierces coal seam length.
In such scheme, in described step 2, horizontal segment adopts casing drilling technology to creep into, described drill string assembly is sleeve pipe, power drilling tool, reamer and drill bit, wherein, described power drilling tool is arranged on bottom sleeve inside, and described reamer and drill bit are arranged in jacket exterior; Described power drill has camber.
In such scheme, in described step 3, survey display, geological logging and engineering parameter adjustment brill dish by referring to gas and ensure that drill string creeps in coal seam; Adopt pumping fishing device to salvage bottom hole assemblies, or adopt oil pipe connection fisher to enter well salvaging DHA.
In such scheme, horizontal segment selects sleeve pipe not cement the well completion, or selects casing cementing completion.
In such scheme, the casing drilling drilling assembly of horizontal segment bores multiple Multilateral Wells at horizontal segment.
Compared with prior art, beneficial effect of the present invention: the present invention uses sleeve pipe directed-drilling technique to carry out coal bed gas horizontal well horizontal segment and creeps into.Concrete advantage is as follows: (1) reduces termination of pumping time when creeping in coal seam, effectively supports coal seam, avoids drilling well swabbing action, reduces horizontal well well slough, buries drilling tool accident; (2) reduce non-cutting times such as making a trip, shorten duty cycle, reduce coal bed gas horizontal well drilling cost; (3) horizontal segment adopts cased hole completion, can bore Multilateral Wells, also can carry out staged fracturing of horizontal well operation to cased hole completion section, increases coal bed gas and resolves area; (4) adopt near-end docking structure, it is short that conventional drilling assembly creeps into length in coal seam, and well safety factor is high; (5) horizontal segment controls well track by gas survey, geology, drilling-time log and curved power drilling tool, reamer and drill bit is only had outside sleeve pipe, once there is borehole collapse can propose reamer, drill bit finishing drilling immediately, do not use the drilling assembly of non-magnetic drilling tool+directed pipe nipple, avoid in accident and cannot propose pit shaft because the outer drilling tool length of sleeve pipe is excessive.
Accompanying drawing explanation
Fig. 1 is coal bed gas horizontally-butted wells well casing programme of the present invention;
Fig. 2 is casing drilling drilling assembly of the present invention;
In figure: 1. horizontal well one spud section, 2. horizontal well two opens straight well section, and 3. horizontal well two opens increasing hole angle section and UNICOM's section, 4. mining straight well, 5. glass reinforced plastic sleeve, 6. reaming hole cave, 7. three open horizontal segment, 8. coal seam, 9. casing string, 10. fishing device, 11. locking devices, 12. power drilling tools, 13. sealing devices, 14. reamers, 15. drill bits.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
The embodiment of the present invention provides a kind of coal bed gas near-end to dock the brill completion method of horizontal well, and as shown in Figure 1, 2, the method is realized by following steps:
Step 1: combined horizontal well straight well section and increasing hole angle section by conventional directional tool and UNICOM's docking straight well, setting of casing well cementation completion.
Concrete, the straight well section of horizontal well and increasing hole angle section and docking straight well are completed by conventional directional tool, and UNICOM position is positioned at horizontal well and has just entered coal seam section, and it is short that described conventional directional tool combination pierces coal seam length.
Use conventional directional tool to combine creeping into of UNICOM's peupendicular hole 4, setting of casing after finishing drilling, enter glass reinforced plastic sleeve 5 under the section of coal seam, well cementation carries out reaming hole operation to fiber glass reinforced plastic cover pipeline section 5 after waiting and coagulating, and forms reaming hole cave 6; Adopt the straight spud section 1 and two of conventional drilling assembly horizontal well drilling to open straight well section 2, enter down the combination of conventional directional tool afterwards and carry out creeping into of increasing hole angle section and UNICOM's section 3, after UNICOM, trip out drilling tool; In peupendicular hole reaming hole cave, section carries out back-up sand, makes position, sand face higher than position, coal seam 1-2m, and carry out note ash afterwards, gray columns height is greater than 50 meters; Horizontal well enters down conventional directional tool combined sand-washing again, rushes after to reaming hole cave 6 and continues at drilling in coal 10m, setting of casing well cementation after circulating fluid pulls out of hole.
Step 2: adopt casing drilling drilling assembly to complete three and open creeping into of horizontal segment.
Concrete, horizontal segment adopts casing drilling technology to creep into, and described drill string assembly is sleeve pipe, power drilling tool, reamer and drill bit, and wherein, described power drilling tool is arranged on bottom sleeve inside, and described reamer and drill bit are arranged in jacket exterior; Described power drill has camber.
Two open wait solidifying after under enter casing drilling drilling assembly and carry out three and open creeping into of coal seam 8 horizontal segment 7.Casing drilling down-hole string string comprises 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 power drilling tool 12 lower contact has certain camber, only has reamer 14 and drill bit 15 to be exposed to casing string 9 bottom.Three open horizontal segment to creep into by gas survey, geology, drilling-time log and curved power drilling tool and brill dish to control well track, can carry out slipping drilling and compound drilling.
Step 3: from sleeve pipe, bottom hole assemblies is tripped out finishing drilling by steel wire fishing device.
Concrete, survey display, geological logging and engineering parameter adjustment brill dish by referring to gas and ensure that drill string creeps in coal seam; Adopt pumping fishing device to salvage bottom hole assemblies, or adopt oil pipe connection fisher to enter well salvaging DHA.
After drilling to completion, from casing string 9, 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 selects sleeve pipe not cement the well completion, or selects casing cementing completion.
The casing drilling drilling assembly of horizontal segment bores multiple Multilateral Wells at horizontal segment.
The also UNICOM's near-end that creeps into that the present invention first uses conventional directional tool to combine horizontal well straight well section and increasing hole angle section docks straight well, setting of casing well cementation after finishing drilling, three open rear under enter casing drilling drilling assembly, downhole motor motor and reamer, drill bit is coordinated to creep into, display and geological logging result is surveyed with reference to gas, downhole motor, reamer, drill bit, to ensure that drill string creeps in coal seam, are tripped out well head finishing drilling with steel wire fishing device after being drilled into design well depth by adjustment brill dish angle from sleeve pipe.
Therefore, the present invention has the following advantages: horizontal segment bores in Completion Operations without drilling, reduce pit shaft swabbing operation, reduce pit shaft quiescent time, it is complete that drilling well terminates both setting of casings, greatly reduces operating risk, reduce operating cost, adopt cased hole completion, fracturing work can be carried out to horizontal segment, improve cbm development benefit; Adopt near-end docking structure, it is short that conventional drilling assembly creeps into length in coal seam, and well safety factor is high; Horizontal segment controls well track by gas survey, geology, drilling-time log and curved power drilling tool, reamer and drill bit is only had outside sleeve pipe, once there is borehole collapse can propose reamer, drill bit finishing drilling immediately, do not use the drilling assembly of non-magnetic drilling tool+directed pipe nipple, avoid in accident and cannot propose pit shaft because the outer drilling tool length of sleeve pipe is excessive.
The above, be only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.
Claims (6)
1. a brill completion method for coal bed gas near-end docking horizontal well, is characterized in that: the method is realized by following steps:
Step 1: combined horizontal well straight well section and increasing hole angle section by conventional directional tool and UNICOM's docking straight well, setting of casing well cementation completion;
Step 2: adopt casing drilling drilling assembly to complete three and open creeping into of horizontal segment;
Step 3: from sleeve pipe, bottom hole assemblies is tripped out finishing drilling by steel wire fishing device.
2. the brill completion method of coal bed gas near-end docking horizontal well according to claim 1, it is characterized in that: in described step 1, the straight well section of horizontal well and increasing hole angle section and docking straight well are completed by conventional directional tool, UNICOM position is positioned at horizontal well and has just entered coal seam section, and it is short that described conventional directional tool combination pierces coal seam length.
3. the brill completion method of coal bed gas near-end docking horizontal well according to claim 1, it is characterized in that: in described step 2, horizontal segment adopts casing drilling technology to creep into, described drill string assembly is sleeve pipe, power drilling tool, reamer and drill bit, wherein, described power drilling tool is arranged on bottom sleeve inside, and described reamer and drill bit are arranged in jacket exterior; Described power drill has camber.
4. the brill completion method of coal bed gas near-end docking horizontal well according to claim 1, is characterized in that: in described step 3, surveys display, geological logging and engineering parameter adjustment brill dish ensure that drill string creeps in coal seam by referring to gas; Adopt pumping fishing device to salvage bottom hole assemblies, or adopt oil pipe connection fisher to enter well salvaging DHA.
5. the brill completion method of coal bed gas near-end according to claim 1 docking horizontal well, is characterized in that: horizontal segment selects sleeve pipe not cement the well completion, or selects casing cementing completion.
6. the brill completion method of coal bed gas near-end docking horizontal well according to claim 1, is characterized in that: the casing drilling drilling assembly of horizontal segment bores multiple Multilateral Wells at horizontal segment.
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Cited By (4)
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| 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 |
| 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 |
| CN115059434A (en) * | 2022-05-31 | 2022-09-16 | 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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| 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 |
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| CN104912480B (en) | 2018-02-09 |
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