CN102022135A - Drilling, pressing and vibrating trinity pressure-relief and outburst-prevention method - Google Patents

Drilling, pressing and vibrating trinity pressure-relief and outburst-prevention method Download PDF

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Publication number
CN102022135A
CN102022135A CN 201010545680 CN201010545680A CN102022135A CN 102022135 A CN102022135 A CN 102022135A CN 201010545680 CN201010545680 CN 201010545680 CN 201010545680 A CN201010545680 A CN 201010545680A CN 102022135 A CN102022135 A CN 102022135A
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China
Prior art keywords
hole
pressure
vibration
coal seam
gas
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CN 201010545680
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Chinese (zh)
Inventor
冯立杰
姜光杰
陈党义
李朝辉
姜锡慧
王金凤
王慧智
胡新平
翟雪琪
刘振锋
邓珺
邓波
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Zhengzhou University
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Zhengzhou University
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Priority to CN 201010545680 priority Critical patent/CN102022135A/en
Publication of CN102022135A publication Critical patent/CN102022135A/en
Pending legal-status Critical Current

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Abstract

The invention discloses a drilling, pressing and vibrating trinity pressure-relief and outburst-prevention method. The method comprises the following steps of: implementing drilling operations of hole sites of reserved vibrating holes (2) and pressing crack holes (3) one by one by adopting known tool technology; performing a pressing crack operation on a coal layer (1) by using a pressure higher than a stratum crack pressure on the pressing crack holes (3); after finishing the pressing crack operation, starting vibrating equipment so that the vibrating equipment can implement continuous vibrating operation in the vibrating holes at a proper vibrating frequency; and simultaneously replacing gas production equipment at the orifices of the pressing crack holes and performing pressure relief on the coal layer (1) by a conventional method to perform gas drainage. The method improves the flow state of gas in the coal layer (1); and simultaneously alternately changed pulling stress and pressing stress effects are acted on the coal layer, so that the method contributes to the desorbing, the diffusing and the flowing of the gas from micropores, creates good conditions for the internal pressure relief and the gas release and flow of the coal layer (1), and improves the capacity of draining the gas in the coal layer.

Description

Trinity pressure-relief outburst-prevention method bores, presses, shakes
Technical field
The present invention relates to a kind of brill, the Trinity pressure-relief outburst-prevention method of pressing, shake, especially be suitable for brill, the Trinity pressure-relief outburst-prevention method of pressing, shake of high gas low permeability coal seam.
Background technology
Contain a large amount of coal bed gas in the coal seam, be called gas again, it is not only valuable resource, it also is the important component part of the outstanding potential of coal and gas in the underground mining of colliery, coal and gas are outstanding to be one of serious natural calamity in the process of coal mining, along with the increase of mining depth, coal-bed gas pressure and content increase, and the gas outburst danger further strengthens.China is coal resources big countries, and along with the high speed development and the scale of coal industry increases suddenly, gas emission increases, and this coal mining accident outstanding, that blast causes of invar rises rapidly.China realizes that successfully mined bed draws out methane, adjacent layer draws out methane, the goaf draws out methane, country rock draws out methane, exploits technology such as topping; and in the protrusion-dispelling of territory, large, medium and small moulded coal mining area, the whole nation, obtained widely using, in control gas explosion with reduce coal and gas has been obtained some effects aspect giving prominence to.Because China's ocurrence of coal seam geological conditions complexity, the gas bearing capacity height, the permeability in coal seam is low, so bigger difficulty occurs aspect gas drainage under suction, though also adopted some to improve the method for gas drainage under suction ability at high gas low permeability coal seam at present, its specific adaptations condition respectively arranged.
Summary of the invention
The purpose of this invention is to provide the effective brill of a kind of simple and easy and reliable, whole release, the Trinity pressure-relief outburst-prevention method of pressing, shake.
Purpose of the present invention can realize by following technique measures (step):
The present invention is with the high pressure fracturing process, method for oscillating combines with drilling construction, by pressure break hole and vibration hole are set in the coal seam, drive the crack that occurs after the original or pressure break in the coal seam, widen and stretch these cracks, and then in the coal seam, produce more secondary fracture and crack, improve the flow regime of gas in the coal seam, increase the gas permeability of gas in the coal seam, simultaneously, according to the action principle of mechanical oscillation, in the coal seam, implement vibration service, changed the physical and mechanical properties in coal seam, thereby reduce the desorption quantity of coal, improve the gas permeation rate, improve the ability of extraction coal-bed gas simultaneously the adsorbance increase gas of gas.
(1) at first detail knowledge is mined or the physical characteristic and the tectonic characteristics in coal seam, driving face the place ahead, in case of necessity, cooperates test measures such as geodetic stress;
(2) select one or more hardness are high relatively or density is big relatively orientation as along layer or wear a layer vibration Kong Kongwei on described coal seam, simultaneously, suitably distance is arranged position, hole, one or more pressure breaks hole around each vibration Kong Kongwei;
(3) then, adopt the known means technology one by one bore operation to be implemented in vibration Kong Kongwei and the position, hole, pressure break hole arranged, the pressure break hole enters the degree of depth in coal seam for should satisfy safe sealing of hole requirement, the degree of depth that described vibration hole enters the coal seam should be determined by the tectonic characteristics in coal seam, not bring out gas outstanding after the sealing of hole vibration is prerequisite, and the aperture in vibration hole should be slightly larger than the vibratory equipment external diameter;
(4) after vibration hole and pressure break hole are accomplished fluently, utilize mounting rod explosion-proof or intrinsic safety type vibratory equipment to be inserted at the bottom of the hole in vibration hole, each fixes a fastening devices in the top of vibratory equipment and bottom, and fill with couplant in the gap between vibratory equipment and vibration hole, utilize sealing device to seal in the aperture in vibration hole then;
(5) determine that the sealing of vibration hole is errorless after, on the pressure break hole, the fracturing unit that adopts external diameter and aperture, pressure break hole to be complementary, to be higher than formation fracture pressure fracturing work is carried out in the coal seam, when pressure in the pressure break hole reaches certain pressure, keep this pressure a period of time, when pressing in the pressure break hole with cracks in coal seam expansion reduction, improve frac pressure once more, so circulation stops behind the pressure complete stability;
(6) after pressure break finishes, open vibratory equipment and make it in the vibration hole, implement the sustained vibration operation, make the coal seam be subjected to tensile stress and the action of compressive stress that alternately changes, simultaneously with suitable vibration frequency, on the pressure break aperture, change aerogenesis equipment, utilize conventional method that the release mash gas extraction is carried out in the coal seam.
The bore mode in described vibration hole and pressure break hole is decided on coal seam geological condition, according to coal seam geostatic stress and mechanical strength, the boring trend in vibration hole and pressure break hole can be designed to directly to or bent to; The frequency of described vibration service should be the best to reach the high anti-reflection property of gas according to the coal geology construction features.
Beneficial effect of the present invention is as follows:
Brill of the present invention, press, the Trinity of shaking pressure-relief outburst-prevention method, with the high pressure fracturing process, method for oscillating combines with drilling construction, adopt pressure break to drive the crack that occurs after the original or pressure break in the coal seam, widen and stretch these cracks, and then in the coal seam, produce more secondary fracture and crack, fire has improved the flow regime of gas in the coal seam greatly, increase the gas permeability of gas in the coal seam, simultaneously, action principle according to mechanical oscillation, in the coal seam, implement vibration service, make the coal seam be subjected to tensile stress and the action of compressive stress that alternately changes, produce the extensional vibration of density interphase, help gas from the micropore desorb, diffusion and flow has improved the permeability of gas, be the release of inside, coal seam, gas discharges and flows has created good condition, improved the ability of extraction coal-bed gas, thereby realized simple and easy and reliable, the release scope is big, the sufficient coal seam of release protrusion-dispelling effect plays the effect that prevents that coal-bed gas is outstanding.
Description of drawings
Fig. 1 is a brill of the present invention, the Trinity pressure-relief outburst-prevention method schematic diagram of pressing, shake;
Be labeled as among the figure: 1: the coal seam; 2: the vibration hole; 3: the pressure break hole.
The specific embodiment
The present invention is further described below with reference to an embodiment (accompanying drawing):
As shown in Figure 1, brill of the present invention, the Trinity pressure-relief outburst-prevention method of pressing, shake, concrete implementation step is as follows:
(1) at first detail knowledge is mined or the physical characteristic and the tectonic characteristics in coal seam, driving face the place ahead 1, in case of necessity, cooperates test measures such as geodetic stress;
(2) select one or more hardness are high relatively or density is big relatively orientation as along layer or wear a layer vibration position, 2 hole, hole on described coal seam 1, simultaneously, suitably distance is arranged position, 3 hole, one or more pressure breaks hole around each vibration position, 2 hole, hole;
(3) then, adopt the known means technology one by one bore operation to be implemented in position, 2 hole, vibration hole and the position, 3 hole, pressure break hole arranged, pressure break hole 3 enters the degree of depth in coal seam 1 for should satisfy safe sealing of hole requirement, the degree of depth that described vibration hole 2 enters coal seam 1 should be determined by the tectonic characteristics in coal seam, not bring out gas outstanding after the sealing of hole vibration is prerequisite, and the aperture in vibration hole 2 should be slightly larger than the vibratory equipment external diameter;
(4) after vibration hole 2 and pressure break 3 holes are accomplished fluently, utilize mounting rod explosion-proof or intrinsic safety type vibratory equipment to be inserted at the bottom of the hole in vibration hole 2, each fixes a fastening devices in the top of vibratory equipment and bottom, and fill with couplant in the gap between vibratory equipment and vibration hole 2, utilize sealing device to seal in the aperture in vibration hole 2 then;
(5) determine that 2 sealings of vibration hole are errorless after, on pressure break hole 3, the fracturing unit that adopts external diameter and 3 apertures, pressure break hole to be complementary, to be higher than formation fracture pressure fracturing work is carried out in coal seam 1, when pressure in the pressure break hole 3 reaches certain pressure, keep this pressure a period of time, when pressing in the pressure break hole 3 with cracks in coal seam expansion reduction, improve frac pressure once more, so circulation stops behind the pressure complete stability;
(6) after pressure break finishes, opening vibratory equipment makes it implement the sustained vibration operation with suitable vibration frequency in vibration hole 2, make coal seam 1 be subjected to tensile stress and the action of compressive stress that alternately changes, the frequency of described vibration service should be the best to reach the high anti-reflection property of gas according to coal seam 1 tectonic characteristics, simultaneously, change aerogenesis equipment in the pressure break hole on 3 mouthfuls, utilize conventional method that release is carried out in coal seam 1 and draw out methane.
The bore mode that should be noted that described vibration hole 2 and pressure break hole 3 is decided on coal seam 1 geological conditions, according to coal seam geostatic stress and mechanical strength, the boring trend in vibration hole 2 and pressure break hole 3 can be designed to directly to or bent to;
Brill of the present invention, press, the Trinity of shaking pressure-relief outburst-prevention method, with the high pressure fracturing process, method for oscillating combines with drilling construction, adopt pressure break to drive the crack that occurs after the original or pressure break in the coal seam, widen and stretch these cracks, and then in the coal seam, produce more secondary fracture and crack, improved the flow regime of gas in the coal seam greatly, increase the gas permeability of gas in the coal seam, simultaneously, action principle according to mechanical oscillation, in the coal seam, implement vibration service, make the coal seam be subjected to tensile stress and the action of compressive stress that alternately changes, produce the extensional vibration of density interphase, help gas from the micropore desorb, diffusion and flow has improved the permeability of gas, be the release of inside, coal seam, gas discharges and flows has created good condition, improved the ability of extraction coal-bed gas, thereby realized simple and easy and reliable, the release scope is big, the sufficient coal seam of release protrusion-dispelling effect plays the effect that prevents that coal-bed gas is outstanding.

Claims (2)

1. the Trinity pressure-relief outburst-prevention method that bores, presses, shakes comprises following step, it is characterized in that:
Step 1, at first the physical characteristic and the tectonic characteristics in detail knowledge coal mining or coal seam, driving face the place ahead (1) in case of necessity, cooperate test measures such as geodetic stress;
Step 2 is upward selected the suitable layer of orientation conduct that one or more hardness are high relatively or density is big relatively or is worn a layer vibration position, hole, hole (2) in described coal seam (1), simultaneously, vibrates Kong Kongwei on every side suitably apart from arranging position, hole, one or more pressure breaks holes (3) at each;
Step 3, then, adopt the known means technology one by one bore operation to be implemented in position, hole, vibration hole (2) and the position, hole, pressure break hole (3) arranged, the degree of depth that pressure break hole (3) enters coal seam (1) should satisfy safe sealing of hole requirement, the aperture in described vibration hole (2) should be slightly larger than the vibratory equipment external diameter, the degree of depth that vibration hole (2) enters coal seam (1) should be a prerequisite not bring out gas outstanding after the sealing of hole vibration by the tectonic characteristics decision of coal seam (1);
Step 4, after vibration hole (3) and pressure break hole (3) are accomplished fluently, utilize mounting rod explosion-proof or intrinsic safety type vibratory equipment to be inserted at the bottom of the hole in vibration hole (2), each fixes a fastening devices in the top of vibratory equipment and bottom, and fill with couplant in the gap between vibratory equipment and vibration hole (2), utilize sealing device to seal in the aperture in vibration hole (2) then;
Step 5, after determining that vibration hole (2) sealing is errorless, on pressure break hole (3), the fracturing unit that adopts external diameter and aperture, pressure break hole (3) to be complementary carries out fracturing work to be higher than formation fracture pressure to coal seam (1), when pressure in pressure break hole (3) reaches certain pressure, keep this pressure a period of time, when pressing in pressure break hole (3), improve frac pressure once more with cracks in coal seam expansion reduction, so circulation stops behind the pressure complete stability;
Step 6, after pressure break finishes, opening vibratory equipment makes it implement the sustained vibration operation with suitable vibration frequency in vibration hole (2), described vibration service frequency should be the best to reach the high anti-reflection property of gas according to coal seam (1) tectonic characteristics, simultaneously, on the pressure break aperture, change aerogenesis equipment, utilize conventional method that coal seam (1) is carried out release and draw out methane.
2. brill as claimed in claim 1, the Trinity pressure-relief outburst-prevention method of pressing, shake, it is characterized in that: the bore mode of described vibration hole (2) and pressure break hole (3) is decided on coal seam (1) geological conditions, according to coal seam geostatic stress and mechanical strength, the boring trend of vibration hole (2) and pressure break hole (3) can be designed to directly to or song to.
CN 201010545680 2010-11-16 2010-11-16 Drilling, pressing and vibrating trinity pressure-relief and outburst-prevention method Pending CN102022135A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103133028A (en) * 2013-03-12 2013-06-05 河南理工大学 Underground coal seam hydrofracture crack oriented developing method
CN103758498A (en) * 2014-01-26 2014-04-30 安徽理工大学 Method and device for improving drilling gas extraction efficiency
CN111188646A (en) * 2020-01-13 2020-05-22 河南理工大学 Low gas permeability coal seam gas drainage equipment

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RU2015341C1 (en) * 1991-04-17 1994-06-30 Бакулин Виктор Николаевич Method for degassing of coal seams and rock masses
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CN102022134A (en) * 2010-11-16 2011-04-20 郑州大学 Drilling, pressing and vibrating combined pressure-relieving coal bed gas exploitation method

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Publication number Priority date Publication date Assignee Title
SU1723342A1 (en) * 1989-07-26 1992-03-30 А.В.Бакулин и Ю.В.Шувалов Method for degassing of coal beds
RU2015341C1 (en) * 1991-04-17 1994-06-30 Бакулин Виктор Николаевич Method for degassing of coal seams and rock masses
US20060113113A1 (en) * 2002-02-19 2006-06-01 Smith International, Inc. Steerable underreamer/stabilizer assembly and method
CN101117893A (en) * 2007-09-07 2008-02-06 重庆大学 Coal bed gas drainage method and device
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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103133028A (en) * 2013-03-12 2013-06-05 河南理工大学 Underground coal seam hydrofracture crack oriented developing method
CN103758498A (en) * 2014-01-26 2014-04-30 安徽理工大学 Method and device for improving drilling gas extraction efficiency
CN103758498B (en) * 2014-01-26 2016-04-06 安徽理工大学 A kind of method and device improving drilling gas extraction efficiency
CN111188646A (en) * 2020-01-13 2020-05-22 河南理工大学 Low gas permeability coal seam gas drainage equipment
CN111188646B (en) * 2020-01-13 2021-04-27 河南理工大学 Low gas permeability coal seam gas drainage equipment

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Application publication date: 20110420

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