CN105114030A - Gas extraction drilling non-solidification constant-pressure slurry hole sealing method - Google Patents
Gas extraction drilling non-solidification constant-pressure slurry hole sealing method Download PDFInfo
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- CN105114030A CN105114030A CN201510515514.5A CN201510515514A CN105114030A CN 105114030 A CN105114030 A CN 105114030A CN 201510515514 A CN201510515514 A CN 201510515514A CN 105114030 A CN105114030 A CN 105114030A
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Abstract
The invention discloses a gas extraction drilling non-solidification constant-pressure slurry hole sealing method; a semifluid hole sealing material is injected in a closed space, formed by two sections of expansion blocking materials, through a slurry injecting pump by a certain pressure; after a hole sealing section is fully injected, the slurry is continuously injected by a period of time until the internal slurry reaches a certain pressure, and the slurry injection is stopped; then, high-concentration gas in a drilling hole is primarily extracted by an extracting pipeline; meanwhile, a pressure measuring hollow rubber ball positioned in the hole sealing section before the slurry injection hole sealing is used for monitoring the pressure change in the slurry in real time, and a connected U-shaped pipe positioned in an orifice is used for obtaining the pressure reading number; and once the internal pressure is reduced to trigger the slurry replenishing pressure, the slurry is replenished in the hole sealing section until the needed pressure is reached again. The method is simple and convenient to operate; and the semifluid slurry with stronger fluidity under constant pressure can actively seal newly developed gaps around the drilling hole at any time, so that the hole sealing effect is improved, and the applicability is wide.
Description
Technical field
The present invention relates to a kind of method for sealing of mash gas pumping drilling, be applicable to stope, sealing that crossdrift is shown in the firedamp taking-out discharging drilling in the places such as coal place, coal road, be particularly useful for the sealing of moisture boring.
Background technology
Gas pumping is the essential measure of control coal mine gas disaster accident, gas drainage borehole sealing quality and effectively extraction cycle determine the effect of mine gas extraction, and gas pumping rate is one of important parameter weighing extracting result, therefore effective hole sealing technology of gas drainage borehole improves the vital link of extraction rate.General higher in its concentration of gas pumping initial stage, can produce a desired effect, but along with the continuity of gas drainage system, under the comprehensive functions such as effective stress, desorb gas, negative pressure of suction, extraction borehole wall-rock crack is grown rapidly, is expanded, deform and destroy and occur a large amount of secondary interstice, sealing of hole section and drill hole wall or its country rock are expanded crack and are formed " gas leakage " passage, extraction later stage aperture extraction negative pressure is caused sharply to decline, reduce gas pumping effect, and shorten boring effective extraction cycle, have a strong impact on coal bed gas extraction rate.A large amount of newborn porous dehiscence gap is constantly produced for country rock of holing in the especially moisture coal bed gas extraction process in coal seam, the technical barrier such as cause the concentration that draws out methane low, the effective extraction cycle short, disposable shutoff can only be carried out in the crack that a traditional method for sealing (comprising expansive cement mortar, yellow mud etc.) around produces for boring, and shutoff slurries solidification forming in the boring of high humility needs to wait for the longer time, affects the normal duration; Sealing material solidifies and generally borehole space also can be made because of the shrinkage of self to be completely filled up afterwards, thus causes Fractured zone to be difficult to effective shutoff, and boring gas leakage is serious, and airtight quality is poor; The basis of a sealing of hole uses secondary hole sealing technology come shutoff boring crack around, not only work consuming consuming time, but also special secondary hole sealing equipment will be purchased, increase cost of production.For solving the sealing problem of moisture mash gas pumping drilling, in the urgent need to the effective method for sealing of one.
Summary of the invention
Goal of the invention: in order to overcome the deficiencies in the prior art, the invention provides a kind of simple to operate, with low cost, moisture mash gas pumping drilling encapsulating method that can increase substantially borehole sealing effect.
Technical scheme: for achieving the above object, the technical solution used in the present invention is:
A kind of mash gas pumping drilling non-condensable constant voltage slurries method for sealing, comprises the steps:
(1) a polyurethane hole sealing bag is bundled respectively in the position at the corresponding two ends, sealing of hole section left and right of gas pumping pipe, by the polyurethane hole sealing bag of left end, Grouting Pipe and pvc pipe and gas pumping pipe are bundled, the left end of Grouting Pipe and pvc pipe is all positioned at the left side of the polyurethane hole sealing bag of left end, and the right-hand member of Grouting Pipe and pvc pipe is all between two polyurethane hole sealing bags; The left end of pvc pipe is communicated with a U-tube, and the right-hand member of pvc pipe is communicated with a hollow pressure measurement ball;
(2) after mash gas pumping drilling drills pore-forming, assigned address in mash gas pumping drilling sent into by the gas pumping pipe that will process through step (1), bottom U-tube down; In U-tube, inject observation liquid, in hollow pressure measurement ball without under pressure condition, in U-tube, the observation liquid level of both sides is consistent;
(3) the polyurethane hole sealing bag reaction at two ends, sealing of hole section left and right is expanded, sealing of hole section is finally made to form seal cavity, open the Grouting Pipe valve in Grouting Pipe, semifluid slurries are injected in sealing of hole section, until the observation liquid level difference of both sides reaches the stopping slip casting height of setting in U-tube, close Grouting Pipe valve;
(4) when the observation liquid level difference of both sides in U-tube reaches the beginning slip casting height of setting, Grouting Pipe valve is opened, until the observation liquid level difference of both sides reaches the stopping slip casting height of setting in U-tube; Repeat step, the hydraulic pressure ensureing in sealing of hole section remains in a constant pressure limit.
Preferably, the appreciable minimum pressure of described hollow pressure measurement ball is 0.1MPa, and the appreciable maximum pressure of hollow pressure measurement ball is 4MPa.Sealing of hole section entoplasm liquid pressure range is 0 ~ 3Mpa, in order to ensure pressure measurement precision when measuring height pressure simultaneously, select the higher hollow pressure measurement ball of susceptibility as in slurries, and exceed the maximum pressure measurement limit of the about 1Mpa of the highest pressure-bearing of slurries as hollow pressure measurement ball, to ensure that hollow pressure measurement ball still can keep pressure measurement precision when pressure-bearing is larger.
Preferably, after opening Grouting Pipe valve, semifluid slurries inject with the pressure of 2 ~ 3MPa in sealing of hole section.When slurries pressure-bearing is injected, if pressure is too little, slurries cannot go deep into shutoff borehole wall crack; If pressure is too large, borehole wall and sealing of hole section two ends plugging material can be extruded, easily cause borehole failure.It is interval as the pressure of slurries pressure-bearing during injection slurries that 2 ~ 3MPa is chosen in final decision.
Preferably, the stopping slip casting of described setting is highly for the observation liquid level difference of both sides reaches 200 ~ 210mm, and the beginning slip casting of described setting is highly for the observation liquid level difference of both sides reaches 150 ~ 160mm.When U-shaped pipe both sides liquid level is equal, liquid level is 150mm, and left side liquid level often raises 10mm, and in hole, pressure increases 0.5Mpa, and when pressure in hole is 0 ~ 0.5Mpa, and when liquid level is 150 ~ 160mm, hole entoplasm hydraulic pressure is not enough by force, starts supplementary slurries; When pressure in hole is 2.5 ~ 3Mpa, and when liquid level is 200 ~ 210mm, hole entoplasm hydraulic pressure reaches predetermined pressure by force, stops slip casting.
Preferably, described semifluid slurries are non-condensable, mineral-type semifluid sealing of hole slurries.As a kind of mineral-type materials, can not produce heat in the process stirred, inject, non-condensable, viscid state can make slurries fill hole wall crack at any time under the effect of the pressure.
Preferably, described semifluid slurries are the mixture of major ingredient, auxiliary material and water, wherein major ingredient is sodium bentonite and kaolinic mixing, auxiliary material is one or more the mixing in silicate of soda, lithium metasilicate, silica, sodium chloride, the quality of major ingredient and auxiliary material and be 1:8 ~ 12 with the mass ratio of water.Swell soil and kaolin can keep the moisture of slurries not run off, and have certain lubrication, are conducive to slurries and infiltrate filled opening.Auxiliary material effect is mainly the volume making slurry volume keep certain, and good hydrophily, can not produce segregation phenomenon.Material-water ratio remains on 1:8 ~ 12, now slurries thick dilution optimum infiltration shutoff hole wall crack.
Preferably, described semifluid slurries do not dewater all the time within the whole cycle in application life of mash gas pumping drilling.In order to the crack that can produce around gas extraction hole in the mash gas extraction of shutoff in real time process, slurries the moment must keep mobility.
Beneficial effect: mash gas pumping drilling non-condensable constant voltage slurries method for sealing provided by the invention, to boring in seal time, with certain pressure, the sealing of hole slurries of semifluid shape are injected, still continue after filling confined space to be with pressure injection a period of time, until reach the pressure threshold value that prompting stops slip casting.The sealing of hole slurries noted are in a kind of state of relative constant voltage all the time, so once new crack of growing appears around in boring, slurries molecule can initiatively permeate, and automatically crams crack, isolated leakage path, reduces entering of air, thus improves gas extraction concentration.And in whole extraction process, the slurries in sealing of hole section do not dewater all the time, keep semi-fluid condition, so be particularly useful for the moisture gas drilling of shutoff.The effect that present method solves newborn crack in gas pumping process and be difficult to the problem of shutoff, its method is simple, easy to operate, gas pumping can be significantly improved, there is fabulous promotional value.
Accompanying drawing explanation
Fig. 1 is enforcement schematic diagram of the present invention;
In figure: 1-mash gas pumping drilling, 2-sealing of hole section, 3-gas pumping pipe, 4-Grouting Pipe, 5-hollow pressure measurement ball, 6-U-shaped pipe, 7-pvc pipe, 8-polyurethane hole sealing bag, 9-gas pumping tube valve, 10-Grouting Pipe valve, 11-semifluid slurries, 12-gas, 13 crack groups.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is further described.
A kind of mash gas pumping drilling non-condensable constant voltage slurries method for sealing, with certain pressure, semifluid sealing material is injected in the confined space of two sections of expansion plugging materials formation by grouting pump, slip casting a period of time is continued after filling sealing of hole section, until its inner slurries reach certain pressure, stop slip casting; Then extraction pipeline is adopted to carry out preliminary extraction to the high concentration gas in boring, simultaneously by being built in the pressure change of the pressure measurement hollow rubber ball Real-Time Monitoring slurries inside in sealing of hole interval before injection hole sealing, and obtain pressure reading by the U-shaped pipe being positioned at aperture be attached thereto; Once internal pressure drops to the pressure triggering slurries and supplement, then start in sealing of hole interval, to supplement slurries, until again reach required pressure.The method specifically comprises the steps:
(1) a polyurethane hole sealing bag 8 is bundled respectively in the position at gas pumping pipe 3 corresponding sealing of hole section about 2 two ends, by the polyurethane hole sealing bag 8 of left end, Grouting Pipe 4 and pvc pipe 7 are bundled with gas pumping pipe 3, the left end of Grouting Pipe 4 and pvc pipe 7 is all positioned at the left side of the polyurethane hole sealing bag 8 of left end, and the right-hand member of Grouting Pipe 4 and pvc pipe 7 is all between two polyurethane hole sealing bags 8; The left end of pvc pipe 7 is communicated with a U-tube 6, and the right-hand member of pvc pipe 7 is communicated with a hollow pressure measurement ball 5; The appreciable minimum pressure of hollow pressure measurement ball 5 is 0.1MPa, and the appreciable maximum pressure of hollow pressure measurement ball 5 is 4MPa;
(2) conventionally to construct in the drill site of tunnel mash gas pumping drilling 1, after mash gas pumping drilling 1 drills pore-forming, the gas pumping pipe 3 processed through step (1) is sent into assigned address in mash gas pumping drilling 1, bottom U-tube 6 down; In U-tube 6, inject observation liquid, in hollow pressure measurement ball 5 without under pressure condition, in U-tube 6, the observation liquid level of both sides is consistent; As shown in Figure 1;
(3) the polyurethane hole sealing bag 8 at sealing of hole section about 2 two ends reacts and expands, sealing of hole section 2 is finally made to form seal cavity, open the Grouting Pipe valve 10 in Grouting Pipe 4, semifluid slurries 11 inject with the pressure of 2 ~ 3MPa in sealing of hole section 2, until the observation liquid level difference of both sides reaches stopping slip casting height (the observation liquid level difference of both sides reaches 200 ~ 210mm) of setting in U-tube 6, close Grouting Pipe valve 10;
(4) when the observation liquid level difference of both sides in U-tube 6 reaches beginning slip casting height (the observation liquid level difference of both sides reaches 150 ~ 160mm) of setting, open Grouting Pipe valve 10, until the observation liquid level difference of both sides reaches the stopping slip casting height of setting in U-tube 6; Repeat step 4, the hydraulic pressure ensureing in sealing of hole section 2 remains in a constant pressure limit.
Described semifluid slurries 11 are non-condensable, mineral-type semifluid sealing of hole slurries, mixed by major ingredient, auxiliary material and water, wherein major ingredient is sodium bentonite and kaolinic mixing, auxiliary material is one or more the mixing in silicate of soda, lithium metasilicate, silica, sodium chloride, the quality of major ingredient and auxiliary material and be 1:8 ~ 12 with the mass ratio of water; Described semifluid slurries 11 do not dewater all the time within the whole cycle in application life of mash gas pumping drilling 1.
The above is only the preferred embodiment of the present invention; be noted that for those skilled in the art; under the premise without departing from the principles of the invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (7)
1. a mash gas pumping drilling non-condensable constant voltage slurries method for sealing, is characterized in that: comprise the steps:
(1) a polyurethane hole sealing bag (8) is bundled respectively in the position at gas pumping pipe (3) corresponding sealing of hole section (2) two ends, left and right, by the polyurethane hole sealing bag (8) of left end, Grouting Pipe (4) and pvc pipe (7) are bundled with gas pumping pipe (3), the left end of Grouting Pipe (4) and pvc pipe (7) is all positioned at the left side of the polyurethane hole sealing bag (8) of left end, and the right-hand member of Grouting Pipe (4) and pvc pipe (7) is all positioned between two polyurethane hole sealing bags (8); The left end of pvc pipe (7) is communicated with a U-tube (6), and the right-hand member of pvc pipe (7) is communicated with a hollow pressure measurement ball (5);
(2) after mash gas pumping drilling (1) drills pore-forming, assigned address in mash gas pumping drilling (1) sent into by the gas pumping pipe (3) that will process through step (1), and U-tube (6) bottom down; In U-tube (6), inject observation liquid, hollow pressure measurement ball (5) without under pressure condition, the observation liquid level of U-tube (6) interior both sides is consistent;
(3) polyurethane hole sealing bag (8) reaction at sealing of hole section (2) two ends, left and right is expanded, sealing of hole section (2) is finally made to form seal cavity, open the Grouting Pipe valve (10) in Grouting Pipe (4), semifluid slurries (11) is injected in sealing of hole section (2), until the observation liquid level difference of U-tube (6) interior both sides reaches the stopping slip casting height of setting, close Grouting Pipe valve (10);
(4) when the observation liquid level difference of both sides in U-tube (6) reaches the beginning slip casting height of setting, open Grouting Pipe valve (10), until the observation liquid level difference of U-tube (6) interior both sides reaches the stopping slip casting height of setting; Repeat step (4), the hydraulic pressure ensureing in sealing of hole section (2) remains in a constant pressure limit.
2. mash gas pumping drilling non-condensable constant voltage slurries method for sealing according to claim 1, it is characterized in that: the appreciable minimum pressure of described hollow pressure measurement ball (5) is 0.1MPa, the appreciable maximum pressure of hollow pressure measurement ball (5) is 4MPa.
3. mash gas pumping drilling non-condensable constant voltage slurries method for sealing according to claim 1, it is characterized in that: after opening Grouting Pipe valve (10), semifluid slurries (11) inject with the pressure of 2 ~ 3MPa in sealing of hole section (2).
4. mash gas pumping drilling non-condensable constant voltage slurries method for sealing according to claim 1, it is characterized in that: the stopping slip casting of described setting is highly for the observation liquid level difference of both sides reaches 200 ~ 210mm, and the beginning slip casting of described setting is highly for the observation liquid level difference of both sides reaches 150 ~ 160mm.
5. mash gas pumping drilling non-condensable constant voltage slurries method for sealing according to claim 1, is characterized in that: described semifluid slurries (11) are non-condensable, mineral-type semifluid sealing of hole slurries.
6. mash gas pumping drilling non-condensable constant voltage slurries method for sealing according to claim 1, it is characterized in that: described semifluid slurries (11) are major ingredient, the mixture of auxiliary material and water, wherein major ingredient is sodium bentonite and kaolinic mixing, auxiliary material is one or more the mixing in silicate of soda, lithium metasilicate, silica, sodium chloride, the quality of major ingredient and auxiliary material and be 1:8 ~ 12 with the mass ratio of water.
7. mash gas pumping drilling non-condensable constant voltage slurries method for sealing according to claim 1, is characterized in that: described semifluid slurries (11) are not dewatered all the time within the whole cycle in application life of mash gas pumping drilling (1).
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| CN106884624A (en) * | 2017-03-29 | 2017-06-23 | 淮南矿业(集团)有限责任公司 | A kind of area of stress concentration crushed zone drilling and sealing device and method for sealing |
| CN108086945A (en) * | 2018-01-20 | 2018-05-29 | 仝耀军 | A kind of layer-through drilling separate type whole process gas drainage hole sealing device and its method for sealing |
| CN108593174A (en) * | 2018-05-08 | 2018-09-28 | 安徽理工大学 | A kind of coal and rock mining induced stress monitoring backpack body |
| CN109209300A (en) * | 2018-09-14 | 2019-01-15 | 辽宁工程技术大学 | A kind of anti-collapse hole method for sealing of complete opening depth sieve pipe of deep fractures drilling |
| CN109578058A (en) * | 2018-12-10 | 2019-04-05 | 中国矿业大学 | A method of extraction borehole gas extraction concentration is improved by auxiliary bore hole |
| CN109681262A (en) * | 2018-12-10 | 2019-04-26 | 中国矿业大学 | A method of improving gas drilling extraction concentration in broken coal body |
| CN110080717A (en) * | 2019-06-17 | 2019-08-02 | 中国矿业大学 | A kind of gas pressure measurement method of horizontal drilling rapid hole sealing |
| CN110107345A (en) * | 2019-06-17 | 2019-08-09 | 中煤科工集团重庆研究院有限公司 | A kind of coal bed gas extraction drilling and sealing and connection hole integrating device |
| CN111561291A (en) * | 2020-05-06 | 2020-08-21 | 太原理工大学 | Double-layer extrusion type hole sealing device and method for gas extraction drill hole |
| CN112412387A (en) * | 2020-11-23 | 2021-02-26 | 中国矿业大学 | Reusable gas drilling two-plugging one-injection integrated hydraulic packer |
| CN113464122A (en) * | 2021-06-23 | 2021-10-01 | 中国矿业大学 | Method for improving gas pressure determination accuracy through auxiliary drilling |
| CN114263449A (en) * | 2021-12-14 | 2022-04-01 | 中国矿业大学 | High-efficient gas drainage device based on hydraulic fracturing |
| CN114635659A (en) * | 2022-04-07 | 2022-06-17 | 中勘资源勘探科技股份有限公司 | Ground drilling negative pressure type leaking stratum wellhead plugging device and method |
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| CN106884624A (en) * | 2017-03-29 | 2017-06-23 | 淮南矿业(集团)有限责任公司 | A kind of area of stress concentration crushed zone drilling and sealing device and method for sealing |
| CN108086945A (en) * | 2018-01-20 | 2018-05-29 | 仝耀军 | A kind of layer-through drilling separate type whole process gas drainage hole sealing device and its method for sealing |
| CN108086945B (en) * | 2018-01-20 | 2023-10-03 | 河南永锦能源有限公司 | Layer-penetrating drilling separation type whole-course gas extraction hole sealing device and hole sealing method thereof |
| CN108593174A (en) * | 2018-05-08 | 2018-09-28 | 安徽理工大学 | A kind of coal and rock mining induced stress monitoring backpack body |
| CN108593174B (en) * | 2018-05-08 | 2024-01-02 | 安徽理工大学 | Coal rock mass mining stress monitoring inclusion |
| CN109209300A (en) * | 2018-09-14 | 2019-01-15 | 辽宁工程技术大学 | A kind of anti-collapse hole method for sealing of complete opening depth sieve pipe of deep fractures drilling |
| CN109578058A (en) * | 2018-12-10 | 2019-04-05 | 中国矿业大学 | A method of extraction borehole gas extraction concentration is improved by auxiliary bore hole |
| CN109681262A (en) * | 2018-12-10 | 2019-04-26 | 中国矿业大学 | A method of improving gas drilling extraction concentration in broken coal body |
| CN109681262B (en) * | 2018-12-10 | 2020-08-07 | 中国矿业大学 | Method for improving gas drilling extraction concentration in broken coal body |
| CN109578058B (en) * | 2018-12-10 | 2021-05-14 | 中国矿业大学 | Method for improving gas extraction concentration of extraction borehole through auxiliary drilling |
| CN110080717A (en) * | 2019-06-17 | 2019-08-02 | 中国矿业大学 | A kind of gas pressure measurement method of horizontal drilling rapid hole sealing |
| CN110080717B (en) * | 2019-06-17 | 2021-05-28 | 中国矿业大学 | Gas pressure measuring method for rapid hole sealing of horizontal drilling |
| CN110107345A (en) * | 2019-06-17 | 2019-08-09 | 中煤科工集团重庆研究院有限公司 | A kind of coal bed gas extraction drilling and sealing and connection hole integrating device |
| CN111561291A (en) * | 2020-05-06 | 2020-08-21 | 太原理工大学 | Double-layer extrusion type hole sealing device and method for gas extraction drill hole |
| CN112412387A (en) * | 2020-11-23 | 2021-02-26 | 中国矿业大学 | Reusable gas drilling two-plugging one-injection integrated hydraulic packer |
| CN113464122A (en) * | 2021-06-23 | 2021-10-01 | 中国矿业大学 | Method for improving gas pressure determination accuracy through auxiliary drilling |
| CN114263449B (en) * | 2021-12-14 | 2022-09-16 | 中国矿业大学 | High-efficient gas drainage device based on hydraulic fracturing |
| CN114263449A (en) * | 2021-12-14 | 2022-04-01 | 中国矿业大学 | High-efficient gas drainage device based on hydraulic fracturing |
| CN114635659A (en) * | 2022-04-07 | 2022-06-17 | 中勘资源勘探科技股份有限公司 | Ground drilling negative pressure type leaking stratum wellhead plugging device and method |
| CN114635659B (en) * | 2022-04-07 | 2023-10-31 | 中勘资源勘探科技股份有限公司 | Ground drilling negative pressure type device and method for plugging leakage stratum wellhead |
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