CN105134285A - Three-blocking and two-injecting gas extraction hole sealing method - Google Patents
Three-blocking and two-injecting gas extraction hole sealing method Download PDFInfo
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- CN105134285A CN105134285A CN201510522193.1A CN201510522193A CN105134285A CN 105134285 A CN105134285 A CN 105134285A CN 201510522193 A CN201510522193 A CN 201510522193A CN 105134285 A CN105134285 A CN 105134285A
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Abstract
The invention relates to the field of underground coal mine gas extraction technologies, in particular to a three-blocking and two-injecting gas extraction hole sealing method. The hole sealing technology is more applied to the field of coal mine gas extraction, and a substantive improvement is achieved for the new technology and the new method compared with the original technology. The hole sealing technology includes the steps of hole flushing, floral tube plugging, pre-sealing, pressure measuring before grouting, pressurized grouting on a front half section, pressurized grouting on a rear half section and hole pasting. After a hole is formed, returned water in a drill rod is used for hole flushing, after the drill rod is pulled out, the drill hole can be fully plugged, a bag is used for pre-sealing, air is injected for a pressure bearing experiment, grouting is conducted on the front half section, grouting is conducted on the rear half section, and hole sealing cement is used for pasting the hole. The technology is simple in process and capable of saving cost, effectively overcoming the defects of two blocking and one injecting, reducing the scrap rate of drill holes and improving the extraction effect again.
Description
Technical field
The present invention relates to coal mine gas extraction field, be specially one " three stifled two notes " gas extraction hole method for sealing.
Background technology
Along with the development of Time Technology, each department coal mining geology condition difference takes greatly the method for gas drainage under suction also to differ widely, particularly of a great variety on hole-sealing technology.Since implementation drainage system, hole-sealing technology is in constantly ripe and improvement, and the initial stage uses polyurethane sealing of hole, and sealing of hole effect is undesirable, and rib and aperture leak gas many.Used " two stifled notes " hole-sealing technology afterwards, be significantly increased than polyurethane sealing of hole effect, gas leakage reduces a lot, but this hole-sealing technology has a drawback, if seal in advance by pouch in hole and carry out slip casting again, in band pressure grouting process, the cherry coal crack that slurry is easy to from being close to pouch in hole flows in deep hole, cause sealing of hole failure, cause gas drainage under suction effect very undesirable.
Summary of the invention
The object of the invention is in conjunction with Changping Company's features as poor geologic condition, ature of coal is soft, crack is little, gas is large feature, a lot of problem is there is in the hole-sealing technology of " two stifled notes " in work progress, courageously tried out new sealing method " three stifled two notes ", the effect obtained is also very remarkable for this reason.
The present invention adopts following technical scheme to realize:
A kind of " three stifled two notes " gas takes out anti-hole method for sealing, comprises the steps:
(1) hole flushing
Rig hydraulic flushing in hole, after reaching projected depth, ensureing that clear water punching 20-25min pulls out drilling rod again, being with water to pull out brill when pulling out distance aperture 20m in drill-through journey, ensures not stay coal dust within the scope of distance aperture 20m.
(2) floral tube and real pipe is filled in
Fill in floral tube in boring after, the real pipe of continued access many, sends into floral tube and real pipe before in boring, and screwed connection place of the real pipe of every root is wound around tight with PE sealant tape; Apart from real pipe end 14-15m place's binding first pouch, be stranded apart from real pipe end 8-9m place and tie up the second pouch, apart from real pipe end 1-2m place's binding the 3rd pouch; Real pipe ties up Grouting Pipe and slurry recovering tube;
Ready floral tube and real pipe are sent in boring.
(3), seal in advance
Pre-envelope in the first pouch and the second pouch, injects air heave, close contact drill hole inner wall.
(4), pressure detecting and slip casting before slip casting
Grouting Pipe is connected grouting pump, conveying air checks the seal degree in Grouting Pipe and seal section, first by input air pressure adjusting to 0.1Mpa, in access Grouting Pipe, at slurry recovering tube place cut-in pressure table, confirm that the output pressure value of slurry recovering tube reaches more than 0.09Mpa, intensified pressure maximum pressure controls at 0.3Mpa gradually, confirm input pressure and output pressure is equal or difference within the scope of 0.02Mpa after, again the leading portion that slurry pipeline steel is formed to the first pouch and the second pouch is sealed in space in advance, reach the volume of calculating Deng slurry after or after anti-slurry pipe outflow slurry, by entering in the second pouch, grout outlet shutoff is tight.
(5), to draw out methane and secondary plugging
Real pipe port being connected gas drainage system, carries out gas pumping operation, when leaking gas or gas density decay is reduced to start extraction concentration 50%, carrying out secondary grouting shutoff, specific as follows:
A, in the 3rd pouch, inject air heave, with drill hole inner wall close contact;
B, Grouting Pipe is connected grouting pump, conveying air checks the seal degree in Grouting Pipe and seal section, first by input air pressure adjusting to 0.1Mpa, in access Grouting Pipe, at slurry recovering tube place cut-in pressure table, confirm that the output pressure value of slurry recovering tube reaches more than 0.09Mpa, intensified pressure maximum pressure controls at 0.3Mpa gradually, confirm input pressure and output pressure is equal or difference within the scope of 0.02Mpa after, again the back segment that slurry pipeline steel is formed to the second pouch and the 3rd pouch is sealed in space in advance, reach the volume of calculating Deng slurry after or after anti-slurry pipe outflow slurry, by entering in the 3rd pouch, grout outlet shutoff is tight.
(6), sealing of hole grout off is finally utilized to hole.
Original " two stifled a note " often note 10 holes have 2 holes and occur spillage phenomenon, and 2 holes of failure are taken out and rib gas leakage will be occurred two days later, announce to scrap.And " three stifled two notes " solve the problem of slip casting failure, also have secondary to improve the effect of extraction concentration, at present, often note 10 holes can only have 1 hole to occur spillage phenomenon, utilize secondary grouting to be solved.Simultaneously; in order to detect the leakage problem of precision that pouch closes and extraction pipeline junction; in construction technology, we have also done the pressure test in slip casting space and the measure of line connection increase protection, solve the major hidden danger easily ignored in work progress.
Improvement and the advantage of this technique are as follows:
1, line connection first does encapsulation process.During plug releasing pipe, pipeline needs the screw thread of bending (span length the only has 5 meters) junction of back segment pipeline to be easy to occur not connecting tight, gas leak phenomenon in job engineering, cause in band pressure grouting process, slurry, from screw thread feed line, causes boring to scrap.This phenomenon can be avoided by being wound around PE sealant tape at pipeline screw thread place;
2, before being with pressure grouting process, the tight situation of pouch and Grouting Pipe is detected.Grouting pump is carried out dally (compressed air) be transported in Grouting Pipe, set up pressure meter or flowmeter from slurry recovering tube, guarantee that compressed-air actuated force value is substantially identical with anti-force value out.
3, need the capacity calculating slurry in slip casting process, avoid occurring that the excessive pouch of bursting of pressure flows in boring.In slip casting process, slurry recovering tube, constantly exporting the air of slip casting section outward, after reaching slurry capacity, if slurry recovering tube does not return out slurry and air, must stop slip casting, prevent from bursting pouch;
If 4 first paragraph slip casting failures, directly can note second segment, ensure the utilization rate of boring.In original annotation slurry process, can announcing that this boring is directly scrapped if there is the phenomenon of boring slurry leakage in hold, in order to effectively utilize boring, after first time slip casting failure, effective utilization that second time slip casting ensure that boring can also be carried out.
5, secondary grouting can improve the gas drainage under suction concentration in boring again.Draw according to measured data, secondary hole sealing slip casting concentration will increase, and illustrate that boring extraction under long-time negative pressure state can produce cranny development to the rib around boring, boring around rib crack, constantly increasing, causes gas leakage.Secondary grouting strengthens again the growth in rib crack along long, decreases gas leakage, extraction concentration is improved again.
The present invention is reasonable in design, in order to improve the utilization rate of boring, saves financial cost, test " three stifled two notes " hole-sealing technology, this technical operation flow is simple, cost-saving, also efficiently solve the drawback of " two stifled notes " simultaneously, decrease the scrappage of boring, again improve gas drainage results.
Accompanying drawing explanation
Fig. 1 represents a shutoff schematic diagram.
Fig. 2 represents secondary plugging schematic diagram.
In figure, 1-holes, 2-floral tube, and the real pipe of 3-, 4-first pouch, 5-second pouch, 6-the 3rd pouch, 7-Grouting Pipe, 8-slurry recovering tube, 9-leading portion seals space in advance, and 10-back segment seals space in advance, 11-PE sealant tape.
Detailed description of the invention
Below in conjunction with accompanying drawing, specific embodiments of the invention are described in detail.
A kind of " three stifled two notes " gas takes out anti-hole method for sealing, pressure measurement before comprising hole flushing, plug floral tube, pre-envelope, slip casting, band pressure grouting first half section, band pressure grouting second half section, sticks with paste hole.Utilize the water outlet of returning in drilling rod to carry out hole flushing after pore-forming, whole boring will be filled up after extracting drilling rod, and utilize pouch to seal in advance, inject air and carry out pressure-bearing experiment, the slip casting of first half section, second half section slip casting, utilize sealing of hole cement paste hole.
Concrete steps are as follows:
(1) hole flushing
After pore-forming of drilling, because the personnel of drilling think little of hole flushing work, make drilling cuttings coal dusts residual a large amount of in holing, after pre-sealing of hole, due to the existence of drilling cuttings coal dust, cause pouch can not be combined closely with boring rib, when carrying out cement injection sealing of hole, band compressed water slurry can, at the bottom of the coal dust ostium between pouch and rib, cause boring to be scrapped, the number of times that this situation occurs in descending boring is more, Gu hole flushing operation is essential.
Hole flushing technique is determined according to use rig, general brill and directional drilling machine hydraulic flushing in hole are after reaching projected depth, ensureing that clear water punching 20-25min pulls out drilling rod again, being with when pulling out distance aperture 20m in drill-through journey water to pull out brill, ensure not stay coal dust within the scope of distance aperture 20m.
(2) floral tube and real pipe is filled in
Fill in floral tube 2 in boring after, continued access 4 is real manages, and floral tube 2 and real pipe 3, are sent into before in boring 1 totally by the real pipe range 4 meters of every root by 16 meters, and screwed connection place of the real pipe 3 of every root is wound around tightly with PE sealant tape 11.Because pipeline needs the screw thread of bending (span length the only has 5m) junction of back segment pipeline to be easy to occur not connecting tight, gas leak phenomenon in job engineering, cause in band pressure grouting process, slurry, from screw thread feed line, causes boring to scrap.This phenomenon can be avoided by being wound around PE sealant tape at pipeline screw thread place.
As shown in Figure 1, 2, apart from real pipe end 14-15m place's binding first pouch 4, be stranded apart from real pipe end 8-9m place and tie up the second pouch 5, apart from real pipe end 1-2m place's binding the 3rd pouch 6; Real pipe ties up Grouting Pipe 7 and slurry recovering tube 8.
Ready floral tube 2 and real pipe 3 are sent in boring 1.
(3), seal in advance
Pre-envelope in the first pouch 4 and the second pouch 5, injects air heave, and close contact is holed 1 inwall.Pouch seals about about 10 minutes in advance.
Grouting pump output pressure is 0.1-0.8Mpa, and slurry continuous input in appointed area can cause certain pressure to pouch and hole wall, in order to ensure between pouch and hole wall within the scope of pressure-bearing mortar leakage prevention, so the pressure detecting before slip casting is essential.
(4), pressure detecting and slip casting before slip casting
Open forward voltage diode pressure adjusting is tested to 0.1Mpa(pressure meter), Grouting Pipe 7 is connected grouting pump, conveying air checks the seal degree in Grouting Pipe and seal section, first by input air pressure adjusting to 0.1Mpa, in access Grouting Pipe 7, at slurry recovering tube 8 place cut-in pressure table, confirm that the output pressure value of slurry recovering tube 8 reaches more than 0.09Mpa, intensified pressure maximum pressure controls at 0.3Mpa gradually, guarantees the leakproofness in pouch enclosure space.Confirm input pressure and output pressure is equal or difference within the scope of 0.02Mpa after, by conventional method, the leading portion that slurry pipeline steel is formed to the first pouch 4 and the second pouch 5 is sealed in space 9 in advance again, as shown in Figure 1, Grouting Pipe generally extend into the bottom that leading portion seals space in advance, and slurry recovering tube then slightly stretches into leading portion and seals in advance in space.Reach the volume of calculating Deng slurry after or after slurry recovering tube 8 flows out slurry, tight into and out of slurry mouth shutoff by the second pouch 5.In slip casting process, slurry recovering tube, constantly exporting the air of slip casting section outward, after reaching slurry capacity, if slurry recovering tube does not return out slurry and air, must stop slip casting, prevent from bursting pouch.Setting and the slip casting of pouch, return sizing process and belong to prior art, be not repeated herein.
(5), to draw out methane and secondary plugging
Under normal circumstances, every 10 Kong Weiyi groups, 10 real pipe ports are connected to gas drainage under suction house steward jointly by sebific duct, carry out gas pumping operation, the methane gas in coal body is entered by the sieve aperture of floral tube, along floral tube and real pipe suction gas drainage system.When boring gas leakage (effect that draws out methane is undesirable) or gas density decay are reduced to start extraction concentration 50%, carry out secondary grouting shutoff, concrete grouting process is identical with leading portion grouting process, as shown in Figure 2, specific as follows:
A, in the 3rd pouch 6, inject air heave, with boring 1 inwall close contact;
B, Grouting Pipe 7 is connected grouting pump, conveying air checks the seal degree in Grouting Pipe and seal section, first by input air pressure adjusting to 0.1Mpa, in access Grouting Pipe 7, at slurry recovering tube 8 place cut-in pressure table, confirm that the output pressure value of slurry recovering tube 8 reaches more than 0.09Mpa, intensified pressure maximum pressure controls at 0.3Mpa gradually, guarantees the leakproofness in pouch enclosure space.Confirm input pressure and output pressure is equal or difference within the scope of 0.02Mpa after, by conventional method, the back segment that slurry pipeline steel is formed to the second pouch 5 and the 3rd pouch 6 is sealed in space 10 in advance again, as shown in Figure 2, Grouting Pipe generally extend into the bottom that back segment seals space in advance, and slurry recovering tube then slightly stretches into back segment and seals in advance in space.Reach the volume of calculating Deng slurry after or after slurry recovering tube 8 flows out slurry, tight into and out of slurry mouth shutoff by the 3rd pouch 6.In slip casting process, slurry recovering tube, constantly exporting the air of slip casting section outward, after reaching slurry capacity, if slurry recovering tube does not return out slurry and air, must stop slip casting, prevent from bursting pouch.
(6) sealing of hole grout off, is finally utilized to hole (paste hole).
In conjunction with Changping Company's features as poor geologic condition, ature of coal is soft, crack is little, gas is large feature, a lot of problem is there is in the hole-sealing technology of original " two stifled notes " in work progress, courageously tried out new sealing method of the present invention " three stifled two notes " to solve, the effect obtained is very remarkable.
It should be noted last that; above embodiment is only in order to illustrate technical scheme of the present invention and unrestricted; although be described in detail with reference to the embodiment of the present invention; those of ordinary skill in the art is to be understood that; technical scheme of the present invention is modified or equivalent replacement; do not depart from the spirit and scope of technical scheme of the present invention, it all should be contained in claims of the present invention.
Claims (1)
1. " three stifled two notes " gas takes out an anti-hole method for sealing, it is characterized in that: comprise the steps:
(1) hole flushing
Rig hydraulic flushing in hole, after reaching projected depth, ensureing that clear water punching 20-25min pulls out drilling rod again, being with water to pull out brill when pulling out distance aperture 20m in drill-through journey, ensures not stay coal dust within the scope of distance aperture 20m;
(2) floral tube and real pipe is filled in
In boring, fill in floral tube (2) the real pipe (3) of continued access many afterwards, floral tube (2) and real pipe (3) are sent into before in boring (1), screwed connection place of the real pipe (3) of every root is wound around tight with PE sealant tape (11); Apart from real pipe end 14-15m place's binding first pouch (4), be stranded apart from real pipe end 8-9m place and tie up the second pouch (5), apart from real pipe end 1-2m place's binding the 3rd pouch (6); Real pipe ties up Grouting Pipe (7) and slurry recovering tube (8);
Ready floral tube (2) and real pipe (3) are sent in boring (1);
(3), seal in advance
Pre-envelope in the first pouch (4) and the second pouch (5), injects air heave, close contact boring (1) inwall;
(4), pressure detecting and slip casting before slip casting
Grouting Pipe (7) is connected grouting pump, conveying air checks the seal degree in Grouting Pipe and seal section, first by input air pressure adjusting to 0.1Mpa, in access Grouting Pipe (7), at slurry recovering tube (8) place cut-in pressure table, confirm that the output pressure value of slurry recovering tube (8) reaches more than 0.09Mpa, intensified pressure maximum pressure controls at 0.3Mpa gradually, confirm input pressure and output pressure is equal or difference within the scope of 0.02Mpa after, again slurry pipeline steel is sealed in space (9) to the leading portion that the first pouch (4) and the second pouch (5) are formed in advance, reach the volume of calculating Deng slurry after or counter starch pipe (8) flow out slurry after, by entering in the second pouch (5), grout outlet shutoff is tight,
(5), to draw out methane and secondary plugging
Real pipe port being connected gas drainage system, carries out gas pumping operation, when leaking gas or gas density decay is reduced to start extraction concentration 50%, carrying out secondary grouting shutoff, specific as follows:
A, to heave to injecting air in the 3rd pouch (6), with boring (1) inwall close contact;
B, Grouting Pipe (7) is connected grouting pump, conveying air checks the seal degree in Grouting Pipe and seal section, first by input air pressure adjusting to 0.1Mpa, in access Grouting Pipe (7), at slurry recovering tube (8) place cut-in pressure table, confirm that the output pressure value of slurry recovering tube (8) reaches more than 0.09Mpa, intensified pressure maximum pressure controls at 0.3Mpa gradually, confirm input pressure and output pressure is equal or difference within the scope of 0.02Mpa after, again the back segment that slurry pipeline steel is formed to the second pouch (5) and the 3rd pouch (6) is sealed in space (10) in advance, reach the volume of calculating Deng slurry after or counter starch pipe (8) flow out slurry after, by entering in the 3rd pouch (6), grout outlet shutoff is tight,
(6), sealing of hole grout off is finally utilized to hole.
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Cited By (4)
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| CN106970181A (en) * | 2017-04-07 | 2017-07-21 | 河海大学 | A kind of drainage consolidation test device and method of grouting behind shaft or drift lining slurries in the earth formation |
| CN107387019A (en) * | 2017-09-19 | 2017-11-24 | 新乡市嘉汇科技有限公司 | A kind of fluid filling hole sealing device |
| CN108868875A (en) * | 2018-08-14 | 2018-11-23 | 山西潞安晋安矿业工程有限责任公司 | A kind of secondary grouting gas hole sealing device with pressure and its construction method |
| CN110984906A (en) * | 2019-11-13 | 2020-04-10 | 山西晋煤集团技术研究院有限责任公司 | Long-distance pressure measuring hole with-pressure grouting hole sealing method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106970181A (en) * | 2017-04-07 | 2017-07-21 | 河海大学 | A kind of drainage consolidation test device and method of grouting behind shaft or drift lining slurries in the earth formation |
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| CN108868875A (en) * | 2018-08-14 | 2018-11-23 | 山西潞安晋安矿业工程有限责任公司 | A kind of secondary grouting gas hole sealing device with pressure and its construction method |
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| CN110984906A (en) * | 2019-11-13 | 2020-04-10 | 山西晋煤集团技术研究院有限责任公司 | Long-distance pressure measuring hole with-pressure grouting hole sealing method |
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