CN104747080B - A kind of method improving coal bed gas ground drilling stability - Google Patents
A kind of method improving coal bed gas ground drilling stability Download PDFInfo
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- CN104747080B CN104747080B CN201510038991.7A CN201510038991A CN104747080B CN 104747080 B CN104747080 B CN 104747080B CN 201510038991 A CN201510038991 A CN 201510038991A CN 104747080 B CN104747080 B CN 104747080B
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- stability
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- 238000005553 drilling Methods 0.000 title claims abstract description 76
- 239000003245 coal Substances 0.000 title claims abstract description 53
- 238000000034 method Methods 0.000 title claims abstract description 25
- 239000011381 foam concrete Substances 0.000 claims abstract description 30
- 238000005065 mining Methods 0.000 claims abstract description 20
- 238000000465 moulding Methods 0.000 claims abstract description 3
- 239000011435 rock Substances 0.000 abstract description 17
- 239000011148 porous material Substances 0.000 abstract description 5
- 238000010276 construction Methods 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 35
- 239000004567 concrete Substances 0.000 description 6
- 230000006835 compression Effects 0.000 description 5
- 238000007906 compression Methods 0.000 description 5
- 230000018109 developmental process Effects 0.000 description 5
- 239000006260 foam Substances 0.000 description 5
- 238000000605 extraction Methods 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
- 241000209094 Oryza Species 0.000 description 3
- 235000007164 Oryza sativa Nutrition 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000005086 pumping Methods 0.000 description 3
- 235000009566 rice Nutrition 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000004088 foaming agent Substances 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 235000011297 Brassica napobrassica Nutrition 0.000 description 1
- 240000002791 Brassica napus Species 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000003570 air Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000004323 axial length Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000035800 maturation Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 238000003756 stirring Methods 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
- E21B7/00—Special methods or apparatus for drilling
- E21B7/18—Drilling by liquid or gas jets, with or without entrained pellets
-
- 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
- E21B7/28—Enlarging drilled holes, e.g. by counterboring
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
Abstract
The present invention relates to a kind of method improving coal bed gas ground drilling stability, comprise the steps: that (1) utilizes water-jet rig to carry out drilling well expanding well at the earth's surface in cbm development region；(2) the caving zone height that well depth is mine is expanded, 8～10 times (3) expansion well expanding well a diameter of drilling well aperture completes backward expansion well section conveying foam concrete, after foam concrete shapes, secondary drilling well, outer layer sleeve, internal layer drainage tube and screen casing are installed after drilling well molding；(4) axial deformation device is installed between screen casing and internal layer drainage tube,.The method construction is simple, expense is relatively low, improve the stability of CBM Drilling simultaneously, make coal bed gas well the mining influence phase and after adopting stable phase do not affected generation closed pore, clogging by rock movement, really can realize " well is multiplex " of coal bed gas ground drilling, improve the utilization rate of CBM Drilling, reduce the Life Cycle Cost of CBM Drilling.
Description
Technical field
The present invention relates to apply in Coal-seam Gas Recovery Technologies field, particularly relate to a kind of raising coal bed gas ground drilling stability
Method.
Background technology
In China's cbm development field, ground well drainage coal bed gas is one of efficient extraction coal bed gas method, but this side
Method puts into huge, it is desirable to have sufficiently economic recovery ensures, the most most ground drillings cannot accomplish " well is multiplex ",
Drilling well utilization rate is low, this is because in the mining influence stage, well bore country rock generation drastic deformation, then cause well bore to deform,
Blocking so that coal bed gas well is in mining influence phase and stable phase generation closed pore phenomenon after adopting, it is impossible to continue extraction coal bed gas.Want
Accomplish coal bed gas well " well is multiplex ", not only to have rational coal bed gas industry to plan, it is often more important that improve coal bed gas well
Extraction efficiency and well bore stability.In the mining influence phase, with seam mining, overlying rock generation inbreak, bend, rupture,
Sequentially forming slow heavy band, fissure zone, caving zone from top to bottom, traditional CBM Drilling is arranged in caving zone or fissure zone,
At horizontally and vertically direction affected by force, drastic deformation can together occur with rock, therefore improve coal bed gas well well bore stability
Seek to improve the non-deformability in the horizontally and vertically direction of well bore.
Foam concrete is by the way of chemically or physically, needs air or nitrogen, carbon dioxide, oxygen according to application
Introduce in concrete mortar Deng gas, through reasonable maintenance, and formed containing a large amount of tiny sealed porositys, and have quite
The concrete product of intensity, has high-strength light, deformability is good, impact energy absorption characteristic is good, the feature of good penetrability.
Foam concrete, from the thirties in last century, is developed by Swede, carries out on a large scale in Norway successful, takes rapidly in Europe, the United States area
Must be widely applied.China, is gone at building, coal etc. by incoming China of the former Soviet Union the most from foam concrete in the early days of foundation
Industry is widely applied, but not yet has foam concrete to be applied to coal bed gas ground drilling at present.
According to the feature of the coal bed gas ground drilling deformation failure characteristic in the phase of adopting Yu foam concrete, can bore at coal bed gas well
Well phase conveying foam concrete, absorb adopt phase country rock horizontal distortion impact energy while the most do not affect rock stratum or coal seam
Permeability；At the axially mounted deformation device of drilling well, opposing rock stratum vertically deforms.By above-mentioned measure improve well bore level and
The non-deformability of vertical direction, it is achieved coal bed gas ground drilling " well is multiplex ", improves coal bed gas ground drilling utilization rate,
Reduce the overall life cycle cost of coal bed gas well.
Summary of the invention
The present invention needs the problem solved to be to overcome current coal bed gas ground drilling to be caused by mining influence in the underground coal productive life
Well bore deformation, the phenomenon such as closed pore, improve the stability of coal bed gas ground drilling, then realize " well is multiplex " of coal bed gas well.
For solving above-mentioned technical problem, the present invention is achieved by the following technical solutions:
The invention provides a kind of method improving coal bed gas ground drilling stability, comprise the steps:
(1) utilizing water-jet rig to carry out drilling well expanding well at the earth's surface in cbm development region, water-jet is bored
Hole equipment i.e. based on hydrodynamics momentum-impulse law, when high-pressure fluid is by nozzle, the pressure of liquid stream is changed by nozzle
For momentum, penetrate with high-speed jet, and target assault target thing.Now, momentum is converted into momentum instantaneous, at impact masterpiece
Breakage is degraded with lower seat rock；Expanding well i.e. utilizes drilling equipment by original drilling well borehole enlargement；
(2) expand the caving zone height that well section height is working seam, expand well section a diameter of drilling well aperture 8～10 times, expand well
Section i.e. utilizes drilling equipment by after original drilling well borehole enlargement, has the spatial dimension in the drilling well aperture after certain altitude and expansion；
(3) expand well complete backward expansion well section conveying foam concrete, until foam concrete shape after, utilize drilling equipment according to
Original drilling well aperture, enters boring from well head, drills foam concrete at drilling well well head first, outside installing after drilling well molding
Layer sleeve pipe, internal layer drainage tube and screen casing；
(4) axial deformation device is installed between screen casing and internal layer drainage tube.
The method construction is simple, and expense is relatively low, improves the stability of CBM Drilling simultaneously, makes coal bed gas well adopt shadow
Phase of sound and adopt rear stable phase and do not affected generation closed pore, clogging by rock movement, really can realize coal bed gas ground drilling
" well is multiplex ", improve CBM Drilling utilization rate, reduce the Life Cycle Cost of CBM Drilling, indirectly
Reduce the development cost of coal bed gas ground drilling.
CBM Drilling aperture described in step (1) is 1.2～2 meters.
Expand drilling depth in well operation described in step (1) and reach above roof at 3～5 meters.
The caving zone height of the mine described in step (2) utilizes colliery caving zone height empirical equation to determine, i.e. inclines when coal seam
When angle is less than 54 °, if directly offending and disobeying with rude remarks Compressive Strength σ 20MPa, caving zone height H1M, M are mining height in=(1～2)；If
Directly offend and disobey with rude remarks Compressive Strength 20MPa≤σ≤40MPa, caving zone height H2=(3～4) M；If directly offending and disobeying with rude remarks Compressive Strength
40MPa≤σ≤60MPa, caving zone height H3=(4～5) M.Described in step (3), in conveying operations, delivered volume is expansion
Long-pending 1.5～2 times of well segment body.Using the method expanding well with conveying foam concrete, the horizontal resistance to compression that expansion well increases coal bed gas well is empty
Between, give full play to foam concrete and absorb that impact capacity is strong and the feature of good penetrability, improve the flat change of water resistant of CBM Drilling
Shape ability.
Described in step (4), axial deformation device is spring.Use the method installing axial deformation device additional, by high strong spring
Deformability, in conjunction with the movement characteristic of overlying rock after seam mining, give the screen casing axial deformation energy in CBM Drilling
Power.
The method of above-mentioned raising coal bed gas ground drilling stability requires to complete CBM Drilling Cheng Jingzuo before seam mining
Industry.
Beneficial effects of the present invention:
(1) the present invention is directed to the anti-horizontal deformation of CBM Drilling stability, use and expand well and conveying foam concrete
Method, expands well and increases the horizontal resistance to compression space of coal bed gas well, can increase the permeability of extraction section simultaneously, carry foam concrete
Then give full play to it and absorbed that impact capacity is strong and the feature of good penetrability.Mining influence after seam mining is stablized after adopting
Phase, utilize and expand horizontal resistance to compression space and the shock absorbing capability of foam concrete that well brings, will originally directly act on coal seam
The impact kinetic energy of pneumatic drill well drainage tube absorbs and reduces, and substantially increases the anti-horizontal deformation of CBM Drilling.
(2) the present invention is directed to the anti-vertical deformability of CBM Drilling stability, use the method installing axial deformation device additional,
By the deformability of high strong spring, in conjunction with the movement characteristic of overlying rock after seam mining, give the sieve in CBM Drilling
Pipe axial deformation ability.After seam mining, overlying rock bends, is caving, after depression, the screen section of CBM Drilling
Axial length can be changed with rock movement, both adapt to the axial tension of rock stratum, and also adapted to being compressed axially of rock stratum.
(3) present invention expansion well method of increase, foam concrete preparation and conveying technique compared with traditional CBM Drilling is equal
Construction is simple, and expense is relatively low, improves the stability of CBM Drilling simultaneously, makes coal bed gas well after mining influence phase and coloured silk
Stable phase is not affected generation closed pore, clogging by rock movement, really can realize coal bed gas ground drilling " well is many
With ", improve the utilization rate of CBM Drilling, reduce the Life Cycle Cost of CBM Drilling, indirectly reduce coal seam
The development cost of gas ground drilling.
Accompanying drawing illustrates:
Fig. 1 is the coal bed gas ground drilling work progress vertical cross section figure of the present invention.
Fig. 2 be the present invention seam mining before the vertical cross section figure of coal bed gas ground drilling.
Fig. 3 be the present invention seam mining after the vertical cross section figure of coal bed gas ground drilling.
Fig. 4 is the horizontal sectional drawing expanding well section of the present invention.
Fig. 5 is the preparation of foam concrete ground and the pumping equipment system of the present invention.
Wherein: 1 water-jet rig, 2 drill bits, 3 directly push up, 4 mining coal seams, 5 drilling well well heads, and 6
The preparation of foam concrete ground and pumping equipment system, 7 foam concrete, 8 outer layer sleeves, 9 internal layer drainage tubes, 10
Screen casing, 11 axial deformation devices, 12 high-strength springs, 13 feeding ports, 14 blenders, 15 foaming agent, 16
Foam device, 17 discharging openings, 18 foam concrete conveying pipes.
Explanation of nouns:
(1) water-jet rig: momentum-impulse law based on hydrodynamics, when high-pressure fluid is by nozzle, liquid
The pressure of stream is converted to momentum by nozzle, penetrates with high-speed jet, and target assault target thing.Now, momentum is changed instantaneous
For momentum, under impact force action, seat rock is degraded breakage.
(2) well is expanded: utilize drilling equipment by original drilling well borehole enlargement.
(3) well section is expanded: utilize drilling equipment by the well bore after original drilling well borehole enlargement, after having certain altitude and expanding
The spatial dimension in footpath；
Detailed description of the invention:
The invention will be further described with embodiment below in conjunction with the accompanying drawings.
Embodiment 1:
(1) as it is shown in figure 1, based on the drilling equipment of cbm development field maturation, use and hole with water-jet
The drill bit 2 of equipment 1, by earth's surface drilling well, drilling well aperture is D1, D1Being 2 meters, drilling well well head 5 is positioned at and directly pushes up in 3,
It is L away from coal seam 4 top board distance1, L1For 4m.
(2) colliery caving zone height empirical equation is utilized to determine caving zone height after working seam, then according to caving zone height
Determine expansion well section height.
(3) seam inclination is less than 54 °, directly top 3 comprcssive strength σ 20MPa, caving zone height H1=2M, M are for adopting
Height, its value is 2 meters；Utilizing water-jet rig 1 to expand well by drilling well well head 5, expanding well height is 2M that is 4
Rice, expands a diameter of D of well2, take drilling well aperture D110 times value i.e. expand a diameter of 20 meters of well.
Expand position relationship such as Fig. 2, the position relationship of horizontal profile such as Fig. 4 of the sectional elevation of well Duan Yuyuan boring.
(4) expanding after well completes, foam concrete is prepared on ground, and its process for preparation is as it is shown in figure 5, first from feeding port
13 send into normal concrete, send into foam device 16 after adding water in blender 14 after stirring, and herein, foaming refers to
It is to use the physics mode such as blowing that by primary liquid state foaming agent 15 made foam state, then this foam is mixed into concrete fills
Dividing mixing, make foam concrete, foam concrete utilizes pumping equipment system 6 to mix to expanding well section conveying foam from discharging opening
Solidifying soil 7, delivered volume is T, and its computing formula is T=(π * H1*D2^2)/4。
(5) after foam concrete 7 condenses and shapes, utilize drilling equipment according to original drilling well aperture D1I.e. drilling well aperture is 2
Rice, enters boring from well head, drills foam concrete 7 at drilling well well head 5 first, is still L away from coal seam 4 top board distance1
I.e. 4 meters.
(6) as in figure 2 it is shown, install outer layer sleeve 8, internal layer drainage tube 9 and screen casing 10 in boring.Internal layer drainage tube 9
And axial deformation device 11 is set between screen casing 10.Its structure such as Fig. 2.I.e. pacify between internal layer drainage tube 9 and screen casing 10
Dress high-strength spring 12, spring and the fixing connection of two pipes, internal diameter and screen casing 10 pipe shaft external diameter at internal layer drainage tube 9 lower nozzle
Identical, screen casing 10 upper orifice external diameter is identical with internal layer drainage tube 9 tube body diameter, i.e. internal layer drainage tube 9 and screen casing 10 nothing
Seam connects, and reduces gas effusion.
(7) as it is shown on figure 3, after the exploitation of coal seam 4, at mining influence phase and stable phase after adopting, foam concrete 7 is by level
Stress influence produces compression, destroys, and axial deformation device 11 is affected generation compression by vertical stress.
Embodiment 2:
Step (1), (2), (4)～(7) is same as in Example 1, and difference is step (3), and its concrete operations are such as
Under: seam inclination is less than 54 °, directly top 3 comprcssive strength 20MPa≤σ≤40MPa, caving zone height H2=4M, M are for adopting
Height, its value is 2 meters；Utilizing water-jet rig 1 to expand well by drilling well well head 5, expanding well height is 4M that is 8
Rice, expands a diameter of D of well2, take drilling well aperture D110 times value i.e. expand a diameter of 20 meters of well.
Embodiment 3:
Step (1), (2), (4)～(7) is same as in Example 1, and difference is step (3), and its concrete operations are such as
Under: seam inclination is less than 54 °, directly top 3 comprcssive strength 40MPa≤σ≤60MPa, caving zone height H3=5M, M are for adopting
Height, its value is 2 meters；Utilizing water-jet rig 1 to expand well by drilling well well head 5, expanding well height is that 2M is
10 meters, expand a diameter of D of well2, take drilling well aperture D110 times value i.e. expand a diameter of 20 meters of well.
Although the detailed description of the invention of the present invention is described by the above-mentioned accompanying drawing that combines, but not to scope
Limiting, one of ordinary skill in the art should be understood that, on the basis of technical scheme, those skilled in the art are not required to
Various amendments that creative work to be paid can be made or deformation are still within protection scope of the present invention.
Claims (8)
1. the method improving coal bed gas ground drilling stability, it is characterised in that comprise the steps:
(1) water-jet rig is utilized to carry out drilling well expanding well at the earth's surface in cbm development region；
(2) the caving zone height that well depth is mine, expand well a diameter of drilling well bore 8～10 times are expanded；
(3) expand well and complete backward expansion well section conveying foam concrete, after foam concrete shapes, to wellhole secondary drilling well,
Drill foam concrete at drilling well well head first, outer layer sleeve, internal layer drainage tube and screen casing are installed after drilling well molding；
(4) axial deformation device is installed between screen casing and internal layer drainage tube,.
The method of raising coal bed gas ground drilling stability the most according to claim 1, is characterized in that, step (1)
Middle drilling well bore is 1.2～2 meters.
The method of raising coal bed gas ground drilling stability the most according to claim 1, is characterized in that, step (1)
Described in expand drilling depth in well operation and reach above roof at 3～5 meters.
The method of raising coal bed gas ground drilling stability the most according to claim 1, is characterized in that, step (2)
Described in the caving zone height of mine utilize colliery caving zone height empirical equation to determine, i.e. when seam inclination is less than 54 °,
If directly offending and disobeying with rude remarks Compressive Strength σ 20MPa, caving zone height H1M, M are mining height in=(1～2)；If directly offending and disobeying with rude remarks Compressive Strength
20MPa≤σ≤40MPa, caving zone height H2=(3～4) M；If directly offending and disobeying with rude remarks Compressive Strength 40MPa≤σ≤60MPa, inbreak
Band height H3=(4～5) M.
The method of raising coal bed gas ground drilling stability the most according to claim 1, is characterized in that, step (3)
Described in conveying operations delivered volume be expand that well segment body is long-pending 1.5～2 times.
The method of raising coal bed gas ground drilling stability the most according to claim 1, is characterized in that, step (3)
Described in the expansion well depth that the degree of depth is step (2) of secondary drilling well.
The method of raising coal bed gas ground drilling stability the most according to claim 1, is characterized in that, step (4)
Described in axial deformation device be spring.
The method of raising coal bed gas ground drilling stability the most according to claim 1, is characterized in that, at seam mining
Before complete CBM Drilling and become well operations.
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| CN201510038991.7A CN104747080B (en) | 2015-01-26 | 2015-01-26 | A kind of method improving coal bed gas ground drilling stability |
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| CN201510038991.7A CN104747080B (en) | 2015-01-26 | 2015-01-26 | A kind of method improving coal bed gas ground drilling stability |
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| CN105696979B (en) * | 2016-02-27 | 2018-03-02 | 山西煤层气有限责任公司 | A kind of coal-bed gas exploitation device and method |
| CN114991752A (en) * | 2022-06-29 | 2022-09-02 | 中国矿业大学 | Intelligent detection method for multilayer mining sleeve for ground drilling mining |
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| CN101603414B (en) * | 2009-07-24 | 2012-11-14 | 吉林省岩科新技术研究开发有限责任公司 | Method for reinforcing wall of drill hole by jet grouting |
| RU2397309C1 (en) * | 2009-09-25 | 2010-08-20 | Открытое акционерное общество "Татнефть" им. В.Д. Шашина | Unit of shank end packing in horizontal well |
| CN102174881B (en) * | 2011-03-14 | 2013-04-03 | 唐山市金石超硬材料有限公司 | Method for drilling holes and protecting walls by plastic expansion casing pipe and special expansion casing pipe |
| CN102425394A (en) * | 2011-09-12 | 2012-04-25 | 联合石油天然气投资有限公司 | Process for performing well drilling, well cementing and well completing at low-pressure oil reservoir side |
| CN202832501U (en) * | 2012-08-30 | 2013-03-27 | 中国石油天然气股份有限公司 | Shock absorption protection holding cylinder |
| WO2014120167A1 (en) * | 2013-01-31 | 2014-08-07 | Halliburton Energy Systems, Inc. | Spring clips for tubular connection |
| CN103867119B (en) * | 2014-02-27 | 2016-08-03 | 中国石油天然气股份有限公司 | Coal seam reservoirs completion remodeling method |
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