CN109403923A - A kind of coal bed gas T-type wears the short horizontal well construction method in goaf - Google Patents
A kind of coal bed gas T-type wears the short horizontal well construction method in goaf Download PDFInfo
- Publication number
- CN109403923A CN109403923A CN201811135500.0A CN201811135500A CN109403923A CN 109403923 A CN109403923 A CN 109403923A CN 201811135500 A CN201811135500 A CN 201811135500A CN 109403923 A CN109403923 A CN 109403923A
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- China
- Prior art keywords
- well
- cement
- drilling
- goaf
- casing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 239000003245 coal Substances 0.000 title claims abstract description 40
- 238000010276 construction Methods 0.000 title claims abstract description 10
- 238000005553 drilling Methods 0.000 claims abstract description 26
- 239000004568 cement Substances 0.000 claims abstract description 18
- 239000011435 rock Substances 0.000 claims abstract description 8
- 210000002445 nipple Anatomy 0.000 claims abstract description 4
- 238000007789 sealing Methods 0.000 claims abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 238000000034 method Methods 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 description 4
- 239000003034 coal gas Substances 0.000 description 3
- 238000005065 mining Methods 0.000 description 3
- 238000000605 extraction Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 210000004709 eyebrow Anatomy 0.000 description 1
- 210000000720 eyelash Anatomy 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 210000003128 head Anatomy 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/006—Production of coal-bed methane
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
- E21B33/138—Plastering the borehole wall; Injecting into the formation
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/04—Directional drilling
- E21B7/046—Directional drilling horizontal drilling
Landscapes
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Fluid Mechanics (AREA)
- Environmental & Geological Engineering (AREA)
- Physics & Mathematics (AREA)
- Geochemistry & Mineralogy (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Earth Drilling (AREA)
Abstract
The invention belongs to coal bed gas goaf well production technique field, specifically a kind of coal bed gas T-type wears the short horizontal well construction method in goaf.Include the following steps, 1) it one opens and drives one aperture of drill bit to basement rock using drilling rod, and layer casing cementing returns to ground on cement.2) it two spuds in into 22m below the bottom plate of coal seam goaf, then upper exhaust gas hidden hole drilling, the sliding eye of tripping in rock bit, two layers of casing of tripping in, two layers of casing base opening of sealing, in two layers of well cementing of cement between casing and the borehole wall after full well is without hindrance.3) it three opens using drill bit conventional mud drilling, preventer is installed in aperture, drills finishing drilling after 50m below the following group seat earth, tripping in inner layer sleeve, well cementing of cement returns spy to gob floor between the borehole wall in inner layer sleeve, and cement invades crushed zone, waits and has coagulated well.4) 2# coal seam section and 3# coal seam section add flexible nipple to constitute drill assembly and creep into using single drilling rod, and drilling direction is crept into along Overburden gob area direction is parallel to.
Description
Technical field
The invention belongs to coal bed gas goaf well production technique field, specifically a kind of coal bed gas T-type wears the short water in goaf
Horizontal well construction method.
Background technique
Area mash gas content is higher, is mostly coal and gas outburst mine, and with the exhaustion of superficial part resource, coal mining
Deep is turned to, Gas Outburst problem is even more serious.Since raw coal gas bearing capacity is higher, the coalbed methane ground extraction of the following group coal is compeled
The eyebrows and eyelashes.It is shown according to existing coal bed gas well air content test result, coal seam ton coal gas bearing capacity is mostly in 20m3 or more, according to gassiness
The rule that amount is incremented by with buried depth, the following group coal gas bearing capacity should be higher than that run of mine coal seam, carry out ground coal bed gas pumping to other coal seams in advance
It adopts, adjacent layer outburst amount and this coal seam outburst amount is of great significance when exploiting other coal seams when mining raw coal layer for reduction.
Straight well, which passes through goaf well type, is that a kind of low cost passes through goaf construction technology, but complete well, it is necessary to carry out
Fracturing reform just can be carried out extraction；Underlied coal seam using horizontal well pumping and mining pressure relief area, well head must be arranged in coal column region, protect
Diameter segment and inclination section are demonstrate,proved in coal column region drilling construction, such as without suitable coal column region, then can not arrange conventional horizontal well.
Summary of the invention
The present invention to solve the above-mentioned problems, provides a kind of coal bed gas T-type and wears the short horizontal well construction method in goaf.
The present invention takes following technical scheme: a kind of coal bed gas T-type wears the short horizontal well construction method in goaf, including following
Step,
1) it one opens using drilling rod driving one aperture of φ 444.5mm drill bit to basement rock, and lower φ 377.7mm surface pipe is cemented the well, water
Ground is returned on mud.
2) two exploitations creep into coal seam goaf bottom plate or less 22m with φ 311.lmm, then upper exhaust gas hidden hole drilling, tripping in
φ 311.lmm rock bit slides eye, tripping in φ bis- layers of casing of 244.5mm, two layers of casing base opening of sealing, two after full well is without hindrance
Well cementing of cement between layer casing and the borehole wall, cement invade crushed zone, and Hou Ning, in work progress, the top opening of two apertures passes through on cement
It returns closure and forms seal area.
3) it three opens using φ 215.9mm drill bit conventional mud drilling, aperture installs preventer, drills the following group seat earth
Finishing drilling after the 50m of lower section, tripping in φ 139.7mm inner layer sleeve, in inner layer sleeve, well cementing of cement returns spy to goaf bottom between the borehole wall
Plate, cement invade crushed zone, and time has coagulated well.
4) 2# coal seam section and 3# coal seam section add flexible nipple to constitute drill set bench drill using the drilling rod of joint length 0.15m
Into drilling direction is crept into along Overburden gob area direction is parallel to.
Compared with prior art, the present invention replaces conventional horizontal well, can be in goaf cloth without suitable coal column region
It sets T-type and wears goaf well.The relatively conventional sidetracked hole of flexible drill string ultra-short radius windowing technology, length of window 3-5m.It is bored using T-type
The window size formed after the windowing of well technology is 20cm or so, and an approximate circular hole, the damage to casing is preferably minimized.The T-type
Drilling technology, horizontal drilling track is controllable, can survey, and turning radius is 1.5 to 1.8 meters, and unilateral horizontal section length maximum is reachable
200m, and maximum updip angle is up to 45 °.
Detailed description of the invention
Fig. 1 is short horizontal well structure chart；
1- mono- is opened in figure, and 2- bis- is opened, and 3- tri- is opened, the goaf 4-, 5-1# coal seam section, 6-2# coal seam section.
Specific embodiment
As shown in Figure 1, a kind of coal bed gas T-type wears the short horizontal well construction method in goaf, include the following steps,
1) it one opens using drilling rod driving one aperture of φ 444.5mm drill bit to basement rock, and lower φ 377.7mm surface pipe is cemented the well, water
Ground is returned on mud.
2) two exploitations creep into coal seam goaf bottom plate or less 22m with φ 311.lmm, then upper exhaust gas hidden hole drilling, tripping in
φ 311.lmm rock bit slides eye, tripping in φ bis- layers of casing of 244.5mm, two layers of casing base opening of sealing, two after full well is without hindrance
Well cementing of cement between layer casing and the borehole wall, cement invade crushed zone, and Hou Ning, in work progress, the top opening of two apertures passes through on cement
It returns closure and forms seal area.
3) it three opens using φ 215.9mm drill bit conventional mud drilling, aperture installs preventer, drills the following group seat earth
Finishing drilling after the 50m of lower section, tripping in φ 139.7mm inner layer sleeve, in inner layer sleeve, well cementing of cement returns spy to goaf bottom between the borehole wall
Plate, cement invade crushed zone, and time has coagulated well.
4) 1# coal seam section and 2# coal seam section add flexible nipple to constitute drill set bench drill using the drilling rod of joint length 0.15m
Into drilling direction is crept into along Overburden gob area direction is parallel to.
Claims (1)
1. a kind of coal bed gas T-type wears the short horizontal well construction method in goaf, it is characterised in that: include the following steps,
1) it one opens using drilling rod driving one aperture of φ 444.5mm drill bit to basement rock, and lower φ 377.7mm surface pipe is cemented the well, water
Ground is returned on mud；
2) two exploitations creep into coal seam goaf bottom plate or less 22m with φ 311.lmm, then upper exhaust gas hidden hole drilling, tripping in φ
311.lmm rock bit slides eye, tripping in φ bis- layers of casing of 244.5mm, two layers of casing base opening of sealing, at two layers after full well is without hindrance
Well cementing of cement between casing and the borehole wall, cement invade crushed zone, and Hou Ning, in work progress, the top opening of two apertures on cement by returning
Closure forms seal area；
3) it three opens using φ 215.9mm drill bit conventional mud drilling, preventer is installed in aperture, is drilled below the following group seat earth
Finishing drilling after 50m, tripping in φ 139.7mm inner layer sleeve, in inner layer sleeve, well cementing of cement returns spy to gob floor, water between the borehole wall
Mud invades crushed zone, and time has coagulated well；
4) 2# coal seam section and 3# coal seam section add flexible nipple to constitute drill assembly and creep into, bore using the drilling rod of joint length 0.15m
It is crept into direction along Overburden gob area direction is parallel to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811135500.0A CN109403923A (en) | 2018-09-28 | 2018-09-28 | A kind of coal bed gas T-type wears the short horizontal well construction method in goaf |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811135500.0A CN109403923A (en) | 2018-09-28 | 2018-09-28 | A kind of coal bed gas T-type wears the short horizontal well construction method in goaf |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109403923A true CN109403923A (en) | 2019-03-01 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811135500.0A Pending CN109403923A (en) | 2018-09-28 | 2018-09-28 | A kind of coal bed gas T-type wears the short horizontal well construction method in goaf |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109403923A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111236858A (en) * | 2020-03-19 | 2020-06-05 | 中国石油天然气集团有限公司 | Downhole drilling tool suitable for slim-hole drilling and use method thereof |
| CN112593910A (en) * | 2020-12-10 | 2021-04-02 | 山西晋城无烟煤矿业集团有限责任公司 | Efficient mining method for broken low-permeability coal bed gas short horizontal well group |
| CN112855021A (en) * | 2021-01-20 | 2021-05-28 | 中煤科工集团西安研究院有限公司 | Coal mine goaf stratum reconstruction and horizontal well drilling completion method |
| CN114439428A (en) * | 2021-12-30 | 2022-05-06 | 中煤科工集团西安研究院有限公司 | Enhanced extraction method for coal bed gas horizontal well under through goaf group |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2466335Y (en) * | 2000-10-15 | 2001-12-19 | 张书明 | Flexible drilling tool |
| CN1693654A (en) * | 2005-06-02 | 2005-11-09 | 淮南矿业(集团)有限责任公司 | Gas pressure relief method of ground drilling extraction minery and goaf |
| US20060006004A1 (en) * | 2004-07-09 | 2006-01-12 | Jim Terry | Method for extracting coal bed methane with source fluid injection |
| CN104405281A (en) * | 2014-10-20 | 2015-03-11 | 山西蓝焰煤层气集团有限责任公司 | Casing drilling technique for over-goaf |
| CN104594943A (en) * | 2015-01-20 | 2015-05-06 | 大同煤矿集团有限责任公司 | Ground composite L-shaped drilling well for gas control and gas control method |
| CN104895531A (en) * | 2015-04-30 | 2015-09-09 | 山西蓝焰煤层气集团有限责任公司 | Single thick coal seam ground mining well extraction process |
| CN104929567A (en) * | 2015-04-30 | 2015-09-23 | 山西蓝焰煤层气集团有限责任公司 | Low-cost construction process for passing through goaf |
-
2018
- 2018-09-28 CN CN201811135500.0A patent/CN109403923A/en active Pending
Patent Citations (7)
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| CN2466335Y (en) * | 2000-10-15 | 2001-12-19 | 张书明 | Flexible drilling tool |
| US20060006004A1 (en) * | 2004-07-09 | 2006-01-12 | Jim Terry | Method for extracting coal bed methane with source fluid injection |
| CN1693654A (en) * | 2005-06-02 | 2005-11-09 | 淮南矿业(集团)有限责任公司 | Gas pressure relief method of ground drilling extraction minery and goaf |
| CN104405281A (en) * | 2014-10-20 | 2015-03-11 | 山西蓝焰煤层气集团有限责任公司 | Casing drilling technique for over-goaf |
| CN104594943A (en) * | 2015-01-20 | 2015-05-06 | 大同煤矿集团有限责任公司 | Ground composite L-shaped drilling well for gas control and gas control method |
| CN104895531A (en) * | 2015-04-30 | 2015-09-09 | 山西蓝焰煤层气集团有限责任公司 | Single thick coal seam ground mining well extraction process |
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Non-Patent Citations (1)
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111236858A (en) * | 2020-03-19 | 2020-06-05 | 中国石油天然气集团有限公司 | Downhole drilling tool suitable for slim-hole drilling and use method thereof |
| CN112593910A (en) * | 2020-12-10 | 2021-04-02 | 山西晋城无烟煤矿业集团有限责任公司 | Efficient mining method for broken low-permeability coal bed gas short horizontal well group |
| CN112855021A (en) * | 2021-01-20 | 2021-05-28 | 中煤科工集团西安研究院有限公司 | Coal mine goaf stratum reconstruction and horizontal well drilling completion method |
| CN114439428A (en) * | 2021-12-30 | 2022-05-06 | 中煤科工集团西安研究院有限公司 | Enhanced extraction method for coal bed gas horizontal well under through goaf group |
| CN114439428B (en) * | 2021-12-30 | 2023-08-25 | 中煤科工集团西安研究院有限公司 | Enhanced extraction method for coal bed gas horizontal well of coal group under goaf group |
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Application publication date: 20190301 |
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| RJ01 | Rejection of invention patent application after publication |