CN101749005A - Protection process of underground drilling hole - Google Patents
Protection process of underground drilling hole Download PDFInfo
- Publication number
- CN101749005A CN101749005A CN 201010125712 CN201010125712A CN101749005A CN 101749005 A CN101749005 A CN 101749005A CN 201010125712 CN201010125712 CN 201010125712 CN 201010125712 A CN201010125712 A CN 201010125712A CN 101749005 A CN101749005 A CN 101749005A
- Authority
- CN
- China
- Prior art keywords
- boring
- hole
- protection
- drilling hole
- protective
- Prior art date
Links
- 238000005553 drilling Methods 0.000 title claims abstract description 46
- 238000000034 methods Methods 0.000 title claims abstract description 20
- 239000003245 coal Substances 0.000 claims abstract description 52
- OKTJSMMVPCPJKN-UHFFFAOYSA-N carbon Chemical compound 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Abstract
Description
Technical field
The present invention relates to the construction of deep under ground minor works, the protection technology of the undergauge that especially in subterranean coal, prevents to hole, the hole of collapsing, long-pending silt, obstruction etc.
Background technology
In mining coal seam gas and underground coal gasification(UCG) process, especially in the underground coal gasification(UCG) of no well formula, need constantly to prolong gasification tunnel, new gasifiable coal resources are provided, this just requires constantly to replenish by the boring of ground to the coal seam in advance.Usually; because the diameter of boring is smaller; if the boring that construction finishes is not well protected; just be easy to because of stratum wriggling, landwaste peel off, water burst etc. is blocked; in the underground coal gasification(UCG) drilling construction, there is borehole casing in the coal seam under in the boring of top, and pipe is outer by the slip casting well cementing of cement; and it is normally exposed to enter coal seam and following boring part, makes things convenient for fluid turnover coal seam.Because bore diameter smaller (being generally less than 1000mm), coal seam are soft, can not use and the various factors influence after the completion at once, undergauge appears in the boring of coal seam section and horizontal orientation boring etc. easily, the hole of collapsing, long-pending become silted up etc., cause when using boring intact inadequately, need to handle once more an even difficult problem such as cause that boring is scrapped.This just makes needs naked hole section is protected after boring is finished, and should guarantee that before utilization it is not blocked to hole when implementing protection, guarantees that again the safeguard measure of boring when utilizing does not influence fluid flowing freely between boring and coal seam.
Summary of the invention
At above technical barrier, the present invention discloses a kind of boring protection technology that is applicable to underground coal gasification(UCG), comprise:, after finishing vertical section borehole casing well cementation, be lowered to horizontal drilling to horizontal segment boring and prop up pillar or filling mixed foaming curing compound for directional drilling; And need assess boring protective device (be different from the boring that horizontal segment is lowered to and prop up pillar) depth of setting earlier for vertical boring, and reinforce at the bottom of the boring hole, be lowered to boring protective device or filling mixed foaming curing compound again.Protection technology for directional drilling and vertically boring can be chosen one wantonly, also can select for use simultaneously, preferably selects for use simultaneously.
The horizontal segment safeguard measure of directional drilling is simple relatively.Finish directional drilling and coal seam with top boring well cementation after, being lowered to boring a pillar or a filling mixed foaming curing compound to horizontal segment boring.
Described to be lowered to a pillar to horizontal segment boring normally sectional, and fashionable being chained together down, free of discontinuities is laid in horizontal drilling.
Described supporting pipe has certain mechanical strength, do not hinder the circulation of gas between coal seam and boring between period of use in boring, material can be common steel tube (screen casing), the glass reinforced plastic pipe that has some apertures, perhaps combustible plastic pipe, bamboo or wood etc., but be not limited to above several, importantly keep boring not blocked, pass through in use or without simple process, fluid can free flow between boring and coal seam.
Described is polyurethane foam to horizontal segment boring filling mixed foaming curing compound.Polyurethane foam technology is very ripe, select the semi-prepolymer method for use at this, part PPG (white material) and vulcabond (black material) are made performed polymer earlier, then with addings such as the polyethers of another part or polyvalent alcohol and vulcabond, water, catalyzer, surfactant, other additives, inject described horizontal segment boring back at a high speed by tubule and mix and foam.The polyurethane foam of hard has certain mechanical strength, can support not slump of drill hole wall after the filling, and these foams are inflammable, when boring utilizes foams is burnt the coal seam and can expose out.
And the protection technology of vertically holing, can be for being lowered to boring protective device 10 or filling mixed foaming curing compound to the boring of coal seam section.
Described boring protective device 10 can shield coal seam exposed between at the bottom of borehole casing 7 lower ends and the hole, and anti-sealing, rock stratum chip, mud, coal cinder etc. fall into the hole and result in blockage.The boring protective device has certain mechanical strength, antiseep.Material can be but be not limited to glass fiber reinforced plastic, bamboo, timber or plastic cement leather bag etc., but do not influence the circulation in gas turnover coal seam after will satisfying when boring is used by simple process.
At first, be the protection technology that is lowered to boring protective device 10 to the boring of coal seam section, particular content is as follows:
Be drilled to vertically boring of a glance from ground to subterranean coal, creep into to borehole casing 7 lower end position depth H 2, inject cement paste to H 2The above boring in position is cemented the well; after waiting with fixed attention; continue to creep into to seat earth 5; according to situations such as position, the clear and definite coal seam of early stage drilling and coring delivery and well-log information, each coal seam thickness, ature of coal, each layer dirt band thickness, seat earth characteristics, estimation borehole casing 7 and 10 times implantation sites of boring protective device.Concrete calculating can be with reference to following formula or similar algorithm:
The boring protective device 10 lower end position degree of depth:
H 1=H 0+∑(h 1，h 2…h n)+∑(M 1，M 2…M n)-c
Wherein: H 1Be the boring protective device lower end position degree of depth (m), H 0Be the roof degree of depth (m), h nBe each dirt band layer thickness (m), M nBe each clean coal layer thickness (m), c is an empirical, and span is 0.5～1.5.
The borehole casing 7 lower end position degree of depth:
H 2=H 1-∑(h 1，h 2…h n）-∑（M 1*A 1，M 2*A 2…M n*A n）-b
Wherein: H 2Be the borehole casing lower end position degree of depth (m), A nBe the ash content (%) of each clean coal layer, b is an empirical, and span is 1～2.
After having calculated relevant parameter, inject cement to the protective device 10 lower end position H that hole to foot of hole 1, carry out foot of hole and reinforce 6; After waiting with fixed attention, remaining one section boring is naked poroid attitude at this moment in the coal seam, is lowered to boring protective device 10 to this naked hole section.
Described boring protective device 10 adopts hard tubing such as glass reinforced plastic pipe, bamboo, timber usually, the preferred glass steel pipe, and hard tubing and borehole casing 7 are by the coal seam of the naked hole of the protection section of overlapping or connect together.
Described boring protective device 10 also can be the plastic cement leather bag, by inflating and losing heart and realize holing the protection of an ancient piece of jade, round, flat and with a hole in its centre and being lowered to and taking out of leather bag.Be specially: if this boring protective device 10 is plastic cement leather bags, need be furnished with charger, not inflate in being lowered to process, inflation is heaved and is filled up naked hole section after the desired location, and the supporting hole wall is avoided subsiding.When boring need be enabled, by losing heart, smaller volume was taken out this boring protective device 10, and boring can utilize.
This boring protective device 10 is if hard, and its length should slightly be longer than naked hole section, and diameter is slightly less than the diameter of borehole casing 7, and the lower end is to foot of hole H 1The position, a upper end part and borehole casing 7 are overlapping or connect together with borehole casing 7.
The material of this protective device has certain rigidity and can support drill hole wall and do not subside, the cutting or the fragmentation of can burning at a certain temperature easily, and protective device 10 is preferably hollow in addition.
In addition, described boring protective device 10 also can adopt the form with borehole casing 7 sockets.Promptly can be drilled to a glance boring from ground to seat earth; transfer implantation site under position, boring protective device 10 lower ends according to drilling data and aforementioned calculation formula calculating borehole casing 7 lower ends; and reinforce the slip casting cement amount that needs at the bottom of the hole, and inject cement paste to boring according to quantity, wait and coagulate.Boring protective device 10 on ground with appropriate length links together with borehole casing 7, the lower end closed of protective device, and the side has window 15, makes things convenient for cementing concrete to return slurry.The cement paste of reinforcing at the bottom of the hole wait coagulate good after, the well casing that is connected with the boring protective device is lowered to boring, the boring protective device is down, is lowered at the bottom of the hole.Inject cement paste in borehole casing 7, mud returns ground by the window 15 of boring protective device 10 bottoms from protective device 10 and sleeve pipe 7 outer walls, finishes well cementation.
Before implementing underground coal gasification(UCG) or in gasification; by technological means near the coal seam the drill hole wall can be contacted with ambient atmosphere by boring; this technological means can be that cutting, perforation, the burning protective device of maybe will holing proposes boring, including, but not limited to above several.
In addition, can also utilize filling mixed foaming curing compound to protect boring, be specially: several fluid blending post-foamings are solidified come supporting boring, such as above-mentioned polyurethane foam fill process, promptly described fluid mixing post-foaming is cured as hard polyurethane foams.Transporting fluid into by a few Zhi Liuti carrier pipes needs to mix according to a certain percentage after the boring of the supporting section, mix back generation foam and be full of this boring section, be solidified into through certain hour and have the support material of bearing capacity surely, high temperature (more than 250 ℃) can burn or froth breaking softening running into.
Adopt boring protection technology of the present invention, the boring of having bored can be placed for a long time and be utilized, need not when utilizing to carry out complicated boring cleaning again, only needs to destroy the boring protective device in the down-hole and gets final product.
Below in conjunction with drawings and Examples the present invention is described in detail.
Description of drawings
Fig. 1 is directional drilling and the vertical boring longitudinal sectional view of implementing after boring is protected
Fig. 2 is the vertical boring longitudinal sectional view of implementing after boring is protected
Fig. 3 is the boring longitudinal sectional view that adopts socket joint type protection technology
Among the figure, 1--vertically holes; The 2--surface soil layer; 3--rock stratum, roof; The 4--coal seam; The 5--seat earth; The 6--foot of hole is reinforced; The 7--borehole casing; The 8--directional drilling; 9--directional drilling sleeve pipe; The 10--protective device of holing; The 11--horizontal drilling props up pillar; A 12-pillar linkage section; 13--boring protective device and borehole casing socket part; The 14--blind end; The 15--window.
Wherein, Fig. 1 is a Figure of abstract.
The specific embodiment
To the detailed description of the invention, below only is preferred embodiment of the present invention below in conjunction with accompanying drawing, can not limit scope of the present invention with this.Promptly the equalization of being done according to the present patent application claim generally changes and modifies, and all should still belong in the scope that patent of the present invention contains.
Embodiment one:
In the present embodiment, will make up directional drilling and vertically boring, and implement both boring protection technology,, provide concrete implementation step in conjunction with Fig. 1 at this.
At first, make up vertically boring 1 through surface soil layer 2, rock stratum, roof 3 and coal seam 4, estimate borehole casing lower end position H according to the design formulas that early stage, borehole data and the present invention provided from ground to seat earth 5 2With boring protective device lower end position H 1, the two degree of depth to ground of Gong Gou coalfield situation of examining the cloth proving ground in new no well formula underground coal gasification(UCG) difficult to understand Ulan is respectively 277 meters and 289 meters.Be drilled into expection borehole casing lower end position H 2The time, in boring 1, be lowered to borehole casing 7, by slip casting cement borehole casing and formation consolidation are in the same place, i.e. well cementation.After well cementation is finished, continue to creep into inside, enter the degree of depth, bore diameter and the boring protective device lower end position H of seat earth 5 according to boring to seat earth 5 1Reinforce the slip casting cement amount that needs at the bottom of calculating the hole,, wait and coagulate, form foot of hole and reinforce 6 according to quantity with the cement paste injection hole.
Secondly, the directional drilling 8, of constructing in distance boring 1 a distance spuds in and finishes to the middle and upper part, coal seam to roof bottom beginning deflecting, and direction is to vertical boring 1 direction, is lowered to borehole casing 9 and implements the slip casting well cementing of cement in the section of opening.After finishing well cementation, two spud in, and into the continuation deflecting is to the middle and lower part, coal seam, and creep into and be tending towards level forward this moment.Vertically being lowered to the directed target that bores to the middle and lower part, coal seam in the boring 1, continue the construction of directional drilling 8, until getting through directional drilling 8 and vertically boring 1, take out rig.
Then, the boring of the deflecting of Xiang Erkai and horizontal segment is lowered to horizontal drilling and props up pillar 11(and be screen casing at this), screen casing is the steel pipe that has some apertures, each sieve tube segment connects or screwed connections by a bit of glass reinforced plastic pipe 12, screen casing from 8 the terminal shop of the section of opening of holing to vertically holing 1 bottom.
At last; be lowered to boring protective device 10 to the coal seam of vertical boring 1 naked section; protective device herein is the inflation leather bag; leather bag is air deflating state in being lowered to process; begin to be its inflation after being lowered to naked hole section; it is similar to the shape of naked hole section to be charged to volume size, fixes appendix at well head, gets final product being connected of aerating device on cut-out and the ground.When boring is about to enable, emit gas in the leather bag by appendix, volume reduces, and can take out leather bag, protects intact boring just can utilize.
Embodiment two:
In conjunction with Fig. 2 vertical boring protection implementation of processes step is described.
At first, utilize rig from ground to seat earth 5, be drilled to a glance through surface soil layer 2, rock stratum, roof 3, coal seam 4 successively and hole 1, examine the drilling well work in early stage of cloth Gong Gou coalfield with reference to Ulan, this moment the coal seam roughly situation such as buried depth, thickness grasp, can estimate borehole casing lower end position H 2Be 277 meters dark and boring protective device lower end position H 1Be 289 meters dark, be drilled into expection borehole casing lower end position H 2The time, well-flushing is lowered to borehole casing 7 (borehole casing 7 lower ends) at the bottom of the hole in 1 to boring, injects cement slurry cementing, with borehole casing 7 and formation consolidation together.After waiting with fixed attention, open once more and creep into to seat earth, according to boring protective device 10 lower end position H 1, bore diameter and drilling depth estimate the cement slurry volume that needs at the bottom of the reinforced hole.
Secondly, well-flushing is carried out in boring, after clear up boring mud, the mud amount that injects estimation is reinforced at the bottom of to the hole, waits and coagulates, formation foot of hole reinforcing 6.
At last, treat that strengthening construction is finished at the bottom of the hole after, borehole casing 7 lower ends following with the boring between 6 at the bottom of the reinforced hole for exposing.The protective device 10(that will hole is glass reinforced plastic pipe at this) be lowered in the boring of coal seam naked section; guarantee to hole the lower end of the upper end of protective device 10 and borehole casing 7 have one section overlapping, enter boring protective device 10 from the upper end to avoid landwaste, silt, formation water etc.When boring need utilize, glass reinforced plastic pipe can be taken out or directly at the bottom of the hole, burns.
Embodiment three:
Specifically state socket joint type boring protection implementation of processes method at this in conjunction with Fig. 3.
At first, make up vertically boring 1,, creep into even drill seat earth 5, examine cloth bow ditch coal driling data and the coal seam situation of coring, estimation borehole casing lower end position H according to Ulan through surface soil layer 2, rock stratum, roof 3, coal seam 4 from ground to subterranean coal 2Be 277 meters dark and boring protective device lower end position H 1Be 289 meters dark, again according to the slip casting cement amount of reinforcing needs at the bottom of bore diameter and the drilling depth estimation hole.
Secondly, well-flushing is carried out in boring, after clear up boring mud, the mud amount that injects estimation is reinforced at the bottom of to the hole, waits and coagulates, formation foot of hole reinforcing 6.
At last; according to result of calculation; getting the boring protective device 10(that is of convenient length is glass reinforced plastic pipe in this usefulness) end and borehole casing 7 connect together; socket part is seen Fig. 3 position 13; the sealing of one end; open two wickets 15 in the side of blind end 14; blind end 14 is following, and borehole casing is lowered in the boring 1, by inject cementing slurry in sleeve pipe; under pressure; cement paste, is full of the space between borehole casing 7 and boring protective device 10 and rock stratum by pressure by the space circulation of wicket outside borehole casing 7; wait and coagulate, promptly finish the protection of well cementation and coal seam section boring.
When the needs utilization is holed, in the boring protective device 10 of coal seam section, be lowered to perforating apparatus, penetrate spud in hole protective device 10 and near cementing concrete ring, the fluid between coal seam and boring has got final product free flow.
Claims (9)
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102134967A (en) * | 2011-01-25 | 2011-07-27 | 煤炭科学研究总院西安研究院 | Construction method of consolidating horizontal directional drilling hole by grouting coal seam baseboard |
| CN102322252A (en) * | 2011-05-30 | 2012-01-18 | 北京奥瑞安能源技术开发有限公司 | Coal bed gas multi-branched horizontal well system and job practices thereof |
| CN102465693A (en) * | 2010-10-29 | 2012-05-23 | 乌兰察布新奥气化采煤技术有限公司 | Underground coal gasification bored well body structure and construction method thereof |
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| CN102587862A (en) * | 2011-01-14 | 2012-07-18 | 乌兰察布新奥气化采煤技术有限公司 | Method for dredging drill hole for underground coal gasification by using compressed air |
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| CN103670357A (en) * | 2012-09-21 | 2014-03-26 | 新奥气化采煤有限公司 | Method for crack communication, channel processing and underground gasification of underground mineral contained organic carbon reservoir |
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| CN103558649A (en) * | 2013-11-08 | 2014-02-05 | 中国科学院武汉岩土力学研究所 | Multifunctional testing platform and testing method of microvibration system |
| CN103835729A (en) * | 2013-11-11 | 2014-06-04 | 北京中煤矿山工程有限公司 | Ground pre-grouting strengthening technology for deep long-distance roadway surrounding rock |
| CN103835729B (en) * | 2013-11-11 | 2016-06-15 | 北京中煤矿山工程有限公司 | Deep distance roadway surrounding rock pre grouting from the surface reinforcement process |
| CN106837237A (en) * | 2016-07-18 | 2017-06-13 | 重庆交通大学 | A kind of coal rock layer of body containing weak structure solidification forming hole method |
| CN106837237B (en) * | 2016-07-18 | 2019-10-01 | 重庆交通大学 | A kind of coal rock layer of body containing weak structure solidification forming hole method |
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