CN104481574B - A kind of method utilizing high energy acoustic-electric complex technique to improve gas permeability of coal seam - Google Patents

A kind of method utilizing high energy acoustic-electric complex technique to improve gas permeability of coal seam Download PDF

Info

Publication number
CN104481574B
CN104481574B CN201410511073.7A CN201410511073A CN104481574B CN 104481574 B CN104481574 B CN 104481574B CN 201410511073 A CN201410511073 A CN 201410511073A CN 104481574 B CN104481574 B CN 104481574B
Authority
CN
China
Prior art keywords
coal seam
coal
electric
energy
acoustic
Prior art date
Application number
CN201410511073.7A
Other languages
Chinese (zh)
Other versions
CN104481574A (en
Inventor
聂百胜
李祥春
孟筠青
卢红奇
杨龙龙
Original Assignee
中国矿业大学(北京)
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 中国矿业大学(北京) filed Critical 中国矿业大学(北京)
Priority to CN201410511073.7A priority Critical patent/CN104481574B/en
Publication of CN104481574A publication Critical patent/CN104481574A/en
Application granted granted Critical
Publication of CN104481574B publication Critical patent/CN104481574B/en

Links

Classifications

    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21FSAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
    • E21F7/00Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B28/00Vibration generating arrangements for boreholes or wells, e.g. for stimulating production
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/003Vibrating earth formations
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/25Methods for stimulating production
    • E21B43/26Methods for stimulating production by forming crevices or fractures

Abstract

The invention discloses a kind of method utilizing high energy acoustic-electric complex technique to improve gas permeability of coal seam, mainly solve prior art and pollute coal seam, cannot thoroughly improve gas permeability of coal seam and the problems such as coal-bed gas Desorption And Seepage can not be improved.This technology, by high electric field pulse and two kinds of technology of sound wave being combined, acts on by producing shock wave, mechanical vibration etc., makes coal seam produce new crack, and extends preexisting crack, thus increases Methane Transport in Coal Seam passage.The high-temperature effect that simultaneously produces, cavitation effect etc. promote coal-bed gas desorbing, improve the percolation ability of gas.The method is divided into ground extraction boring method and along coal seam extraction boring method two kinds, and implementation process is as follows: (1) trips out all devices in boring;(2) driftings such as well rule are used, water filling in boring, drilling well, acoustic-electric compound action device is placed into appointment position, it is 30cm that coal seam is divided into different sections, each section thickness;(3) affector in coal seam each section repeated action;(4) equipment such as acoustic-electric compound action device are tripped out;(5) coal bed drilling is carried out extraction.

Description

A kind of method utilizing high energy acoustic-electric complex technique to improve gas permeability of coal seam

Technical field

The present invention relates to a kind of method utilizing high energy acoustic-electric complex technique to improve gas permeability of coal seam, can be used for ground coal bed gas drainage drilling well and down-hole and hole along coal seam extraction, belong to energy field.

Background technology

China is the country that coal production is most in the world, consumption is maximum, its in China's energy resource structure ratio in occupation of consequence.At present, coal proportion in China's primary energy consumption production and consumption structure is 76% and 68.9%, and following 20 years coal accounts for primary energy proportion still more than 50%.

In China's coal-mine produces, gas has become the key factor of restriction coal industry development.And China's gaseous mine is numerous, highly gassy mine and coal and gas outburst mine account for about the 45% of mine sum, the total number of accident that gas causes simultaneously accounts for about the 30%-40% of coal mining accident, cause about 1300 people dead altogether coal mining accident in 2012, fatality rate per million tons is 0.374, causes serious social influence and economic loss.Meanwhile, coal bed gas is more serious to atmospheric pollution, is to cause greenhouse effect, destroy the main matter of atmospheric ozone layer, and its greenhouse effect is about 22 times of equal-volume carbon dioxide, is 7 times of carbon dioxide to the damage capability of ozone layer.

Although gas is the major reason affecting safety of coal mines exploitation, but it also it is a kind of clean energy resource simultaneously.According to statistics, China's buried depth reaches 36 tcms at 2000m with shallow coal bed gas resource, suitable with conventional gas resource, it is possible to provide basis for China's Energy restructuring.

In coal seam, coal bed gas is composed be stored in coal seam reservoirs with free and absorption two ways, and wherein ADSORPTION STATE accounts for more than 90%, and when free coal bed gas pressure is less than absorption coal bed gas pressure, ADSORPTION STATE can be changed into free state.And China coal seam generally belongs to low permeability coal seam, therefore manage to improve gas permeability of coal seam, dredging Methane Transport in Coal Seam passage, make free state gas discharge, reduce free state coal bed gas pressure, be the key link improving coal bed gas extraction.

At present, the methods using pressure break that China coal seam is anti-reflection more, also the multiple methods such as intensive boring, orientation pinniform drilling well, major diameter long drilled holes extraction, hydraulic flushing in hole, cross borehole, distressed zone extraction, goaf extraction, acidifying extraction and heating extraction have been tested, it was also proposed that apply impressed field and improve gas migration condition in coal seam reservoirs simultaneously.But owing to the condition in China coal seam has larger difference, although therefore said method has certain effect, but coal mining accident still takes place frequently.

Anti-reflection to high electric field pulse technology and sound wave technology is combined by this invention, overcome tradition anti-reflection method coal seam is polluted, feature such as coal seam local compacting etc., its heat effect produced, cavitation effect etc. promote coal-bed gas desorbing, suppression coal-bed gas absorption simultaneously.

Summary of the invention

It is an object of the invention to provide a kind of coal seam anti-reflection method novel, that high electric field pulse technology is combined mutually with ultrasound wave, the shortcoming overcoming traditional coal seam anti-reflection method, under conditions of not polluting coal seam, produce, extend coal body new life crack and preexisting crack, other effects that this technology produces simultaneously can improve the desorption and seepage ability of coal-bed gas, the absorbability of suppression coal-bed gas, thus improves the pumping volume of coal-bed gas.

The technical scheme of this invention is: use water as medium, electrode is placed wherein with sonic probe, energy is provided to electrode and probe by energy-storage system, electrode and probe pass through electrohydraulic effect, cavitation effects etc. convert electrical energy into mechanical energy, heat energy etc., coal body is acted on by perforation holes etc., it it is stiffening effect simultaneously, can be at same position repeat function, so can produce new crack in coal seam, extension preexisting crack, and the mechanical vibration effect of shock wave can release the tamper in cracks in coal seam, heat effect can promote coal-bed gas desorbing, suppression gas adsorption, thus improve gas permeability of coal seam, reach to transform coal seam, improve the effect of coal bed gas drainage.

This technology implementation step is as follows: (1) is in ground or underground construction drilling well or along coal bed drilling, all devices in boring is tripped out after completing, wherein the extraction degree of depth in ground is away from seat earth 50-100cm, and down-hole is identical with conventional coal seam extraction drillable length along coal bed drilling length;(2) use relevant device through extraction drilling well or boring, enable acoustic-electric acting device to reach smoothly to specify position;(3) injecting the liquid mediums such as water in boring, when using ground extraction drilling well, the position of horizontal plane should be higher than that roof 2-3m, is drillable length along aqueous medium position during coal bed drilling, is then put in boring by acoustic-electric compound action device;(4) high electric field pulse electrode and sonic probe recombiner are put into position, coal seam in boring, if coal seam is thicker, coal seam is divided into different sections, each section thickness is 30cm-50cm, when for during along coal bed drilling, effect section can suitably adjust, and operational factors is 20-50 time;(6), after operation completes, the equipment such as acoustic-electric compound action device are tripped out;(7) coal bed drilling is carried out extraction.

The advantage of this technology mainly has: (1) this technology is using water as interaction medium, without proppant, acidulant etc., does not pollute coal seam;(2) in operation process, this technology will not form area of stress concentration in coal seam, it is ensured that the progress of follow-up work;(3) this Technology Energy is concentrated, and the pressure etc. of its release is far longer than the comprcssive strength in coal seam, produces new crack, improves the seepage channel of gas;(4) tamper in this technology is formed effect of vibration, peelable cracks in coal seam, the hole such as cavitation, plays releasing coal seam ponding, improves the percolation ability of coal-bed gas;(5) this technology is affected less by geological environment, working environment, and the time used is short;(6) this technology carries out section process to coal seam, can be according to character Accommodation parameter, frequency and the time in coal seam.

Accompanying drawing explanation

Fig. 1 is the acoustic-electric effect composite equipment schematic diagram that this invention uses.

Fig. 2 is that the present invention is to ground drillng operation schematic diagram.

Fig. 3 be the present invention to down-hole along coal bed drilling operation schematic diagram.

Detailed description of the invention

Before this technology implementation, should fully investigate the enforcement geological structure situation in coal seam, coal seam physico-mechanical properties, history increasing mining method, adjust the operational factors of high electric field pulse parameter and sonic probe to adapt to coal seam conditions simultaneously.

With reference to Fig. 1, the high power acoustic-electric compound action device that this invention uses is mainly by boosting unit, energy-storage units, discharger and energy transducer etc., wherein boosting unit is made up of transformator etc., energy-storage units is composed in parallel by multiple capacitors, discharger is mainly electrode and sonic probe provides its required electric energy, and energy transducer is mainly made up of electrode and sonic probe.This affector is also equipped with Position Finding Device etc. to determine affector position simultaneously.

The enforcement step of this technology is as follows: (1) along coal bed drilling, trips out all devices in boring in ground construction drilling well or down-hole after completing;(2) relevant device through extraction drilling well or boring are used, due to this affector diameter be about 115mm, length is about 5.5m, need to use the steel pipe about diameter 120mm, length 6.5m as drift size gauge tool for preventing coal bed gas well from transferring due to reason inhibition devices such as deformation, it is ensured that acoustic-electric compound action device reaches to specify position;(3) need to use medium as transmission due to this technology, therefore in boring, inject the liquid mediums such as water, when using ground extraction drilling well, height coal output layer position, the position 2-3m of water, it is drillable length along aqueous medium position during coal bed drilling, then acoustic-electric compound action device is put in boring;(4) high electric field pulse electrode and sonic probe recombiner are put into position, coal seam in boring, if coal seam is thicker, coal seam is divided into different sections, each section thickness is 30cm-50cm, when for during along coal bed drilling, effect section can suitably adjust, and operational factors is 20-50 time;(6) after operation completes, trip out the equipment such as acoustic-electric compound action device, assemble water pump, water pipe and drinking-water pipe etc. and the water of drilling well (hole) is carried out pump drainage, then according to conventional drainage method carries out extraction.

Fig. 2 is the present invention using method at ground drilling.After completing drilling well, need to trip out all devices in well, drifting and toward water filling in drilling well, the position of water is away from roof about 3m.In the method, instrument monitoring instrument and equipment adjusting means are on ground, and wherein the operational factor of each instrument in instrument monitoring instrument monitoring down-hole, equipment adjusting means are regulated electrode and sonic probe operational factors and controlled the operational factors of this equipment by coaxial high pressure cable.During operation, deliver to specify position by acoustic-electric compound action device by the instrument such as cable reel and pulley, utilize ground 220V custom circuit that this device is tentatively powered, voltage is raised to discharge voltage by the boosting unit carried by instrument, charge for energy-storage units after rectified, when being charged to the operation threshold of discharger, the electric energy of storage is passed to energy transducer by discharger, i.e. electrode and sonic probe, energy transducer is with electrohydraulic effect, cavitation effects etc. convert electrical energy into mechanical energy, heat energy etc., realize coal seam is made seam, promote coal-bed gas desorbing, diffusion and seepage flow.For the first time during operation, being placed at seat earth by acoustic-electric compound action device, start effect, number of times is 20-50 time, then instrument upwards carries 30-50cm and carries out effect 20-50 time again, and effect is until this compound action device reaches at roof successively.

Fig. 3 be the method in down-hole along the application schematic diagram in coal bed drilling, similar with the using method of ground drilling.After operation completes, simply tackle boring carry out sealing of hole extraction.

Claims (6)

1. utilizing the method that high energy acoustic-electric complex technique improves gas permeability of coal seam, its feature exists In: coal seam is acted on by the method by acoustic-electric compound action device, and this affector is by high-tension electricity Pulsed electrode and sonic probe composition, then provided to electrode and sonic probe by energy-storage system Energy, so that electrode and sonic probe produce the shock wave of high intensity, cracks in coal seam in coal seam Being mutually communicated, improve drill mash gas amount, implementation step is as follows: (1) trips out brill All devices in hole;(2) use the driftings such as well rule, enable acoustic-electric acting device to reach smoothly Position, coal seam;(3) injecting the liquid mediums such as water in boring, position is held with gas pumping well Flat, acoustic-electric compound action device is put in boring;(4) affector is put in boring to coal seam Position, if coal seam is thicker, it is 30cm-that coal seam is divided into different sections, each section thickness 50cm;(5) affector in coal seam each section repeated action;(6) the compound work of acoustic-electric is tripped out With equipment such as devices;(7) coal bed drilling is carried out extraction.
2. improve gas permeability of coal seam according to the high energy acoustic-electric complex technique that utilizes described in claim 1 Method, it is characterised in that: high electric field pulse technology by electrohydraulic effect, cavitation effect etc. will Electric energy is converted into mechanical energy etc., has that energy is big, transformation efficiency high, it is possible to make coal seam Preexisting crack and newborn crack are mutually communicated, and provide passage for gas migration.
3. improve gas permeability of coal seam according to the high energy acoustic-electric complex technique that utilizes described in claim 1 Method, it is characterised in that: ultrasound wave can induce heat effect, promote coal-bed gas desorption, Improving desorption efficiency, the cavitation effect simultaneously produced, mechanism can to extraradial shock wave Shear coal body, produce new crack, extension preexisting crack, improve coal bed gas drainage effect.
4. improve gas permeability of coal seam according to the high energy acoustic-electric complex technique that utilizes described in claim 1 Method, it is characterised in that: needed for high electric field pulse electrode and sonic probe, discharge voltage is several Wan Fu, discharge energy is huge, and its actuating pressure reaches tens MPas.
5. improve gas permeability of coal seam according to the high energy acoustic-electric complex technique that utilizes described in claim 1 Method, it is characterised in that: its longitudinal sphere of action of the method is 30-50cm, it is possible to coal seam Section carries out being repeated several times effect, and implementation is simple.
6. improve gas permeability of coal seam according to the high energy acoustic-electric complex technique that utilizes described in claim 1 Method, it is characterised in that: this technology combines high electric field pulse technology and sound wave anti-reflection method phase Combining mutually, its energy is big, pollution-free to coal seam, can produce crack, rush in coal seam simultaneously Enter coal-bed gas desorbing, improve gas permeability of coal seam.
CN201410511073.7A 2014-09-29 2014-09-29 A kind of method utilizing high energy acoustic-electric complex technique to improve gas permeability of coal seam CN104481574B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201410511073.7A CN104481574B (en) 2014-09-29 2014-09-29 A kind of method utilizing high energy acoustic-electric complex technique to improve gas permeability of coal seam

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201410511073.7A CN104481574B (en) 2014-09-29 2014-09-29 A kind of method utilizing high energy acoustic-electric complex technique to improve gas permeability of coal seam

Publications (2)

Publication Number Publication Date
CN104481574A CN104481574A (en) 2015-04-01
CN104481574B true CN104481574B (en) 2016-08-24

Family

ID=52756166

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201410511073.7A CN104481574B (en) 2014-09-29 2014-09-29 A kind of method utilizing high energy acoustic-electric complex technique to improve gas permeability of coal seam

Country Status (1)

Country Link
CN (1) CN104481574B (en)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104863561B (en) * 2015-04-15 2017-06-23 中国矿业大学 A kind of down-hole coal bed pulse detonation wave orientation fracturing anti-reflection method
CN104863628B (en) * 2015-04-15 2017-08-25 中国矿业大学 One kind utilizes the anti-reflection shielding coal roadway tunneling method of pulse detonation wave fracturing
CN104989338B (en) * 2015-07-10 2018-05-29 贾剑 A kind of method for controlling coal mine gas infiltration and pneumatic sound wave generating device
CN105971660B (en) * 2016-05-05 2017-11-14 中国矿业大学 Ultrasonic cavitation and hydraulic fracturing joint incentive coal bed gas pumping method
CN106351635A (en) * 2016-08-23 2017-01-25 西安交通大学 Stimulated device for research on shock wave characteristics and fracturing characteristics under high hydrostatic pressure
CN107869342B (en) 2016-09-27 2020-05-19 华中科技大学 Pipeline scale removal and rock stratum fracturing device based on liquid electric pulse shock wave
CN106761646A (en) * 2016-12-30 2017-05-31 北京百恒达石油技术有限公司 Shock wave makes seam apparatus and system
CN107489444B (en) * 2017-09-08 2019-11-12 中国神华能源股份有限公司 A kind of gas channel forming method for the formation gas channel in coal seam
CN107630717B (en) * 2017-09-18 2020-02-07 中国矿业大学 Coal bed permeability increasing method with electric pulse and coal bed water injection in cooperation
CN107989586B (en) * 2017-10-18 2018-12-25 西安交通大学 Coal bed gas well remodeling method based on the compound surge formula pressurized water injection of controllable shock wave
CN107956505A (en) * 2017-10-18 2018-04-24 西安交通大学 Coal mine down-hole drilling anti-reflection method based on controllable shock wave technology
CN109723487A (en) * 2019-01-15 2019-05-07 高九华 Air pulsing quantum energy is implanted into presplitting permeability-increasing gas pumping method and device
CN110925014A (en) * 2019-11-14 2020-03-27 刘云山 Method for quickly releasing gas by injecting pressure air into coal mine
CN111237013A (en) * 2020-03-13 2020-06-05 神华神东煤炭集团有限责任公司 Drainage method and device

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101813002A (en) * 2010-04-26 2010-08-25 张海成 Coal seam pre-splitting method based on gas extraction
CN102691515A (en) * 2011-03-21 2012-09-26 大庆中油庆瑞石油科技有限公司 Coal mine underworkings-type coal-seam gas fracturing equipment
CN102830170A (en) * 2012-07-23 2012-12-19 中国科学院地质与地球物理研究所 Control method and control device for obtaining coal sample transverse wave signal based on ultrasonic test
CN103806934A (en) * 2014-02-28 2014-05-21 山东科技大学 High-stress low-porosity coal bed presplitting permeability-increase methane drainage system and method

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101813002A (en) * 2010-04-26 2010-08-25 张海成 Coal seam pre-splitting method based on gas extraction
CN102691515A (en) * 2011-03-21 2012-09-26 大庆中油庆瑞石油科技有限公司 Coal mine underworkings-type coal-seam gas fracturing equipment
CN102830170A (en) * 2012-07-23 2012-12-19 中国科学院地质与地球物理研究所 Control method and control device for obtaining coal sample transverse wave signal based on ultrasonic test
CN103806934A (en) * 2014-02-28 2014-05-21 山东科技大学 High-stress low-porosity coal bed presplitting permeability-increase methane drainage system and method

Also Published As

Publication number Publication date
CN104481574A (en) 2015-04-01

Similar Documents

Publication Publication Date Title
Huang et al. Cavability control by hydraulic fracturing for top coal caving in hard thick coal seams
CN103924955B (en) A kind of shale gas well CO2And slippery water mixing fracturing technology
CN102852506B (en) High-pressure pneumatic blasting pressure relieving and transmission increasing method
CN105332684B (en) A kind of water under high pressure is quick-fried and CO2The coal bed gas displacement extraction technique that pressure break is combined
AU2014336858B2 (en) Method for enhanced fuel gas extraction by coal mine underground gas-liquid dual-phase alternating phase-driven fracturing of coal body
CN102493822B (en) Method for performing curtain grouting construction on tunnel by water rich fault influence zone
CN101581231B (en) Gas drainage method for loosening coal body through cross layer boring and hydraulic fracture
CN106285617B (en) Gas water horizontal well completion method
CN103821544B (en) Tunneling and underground engineering high-pressure high-flow is dashed forward Water outburst treatment method
CN102140901B (en) High pressure resistant drilled hole sealing method
CN104563990B (en) One kind bores blanking integration and heat injection cooperative reinforcing coal bed gas extraction method
CN103362538B (en) Pressure alternate gas exhausting method by slotting and fracturing coal seams
WO2016165396A1 (en) Downhole coal seam pulse detonation wave directional fracturing permeability-increasing method
CN103696800B (en) A kind of brill cuts pressure and takes out method
CN101915083B (en) Method for extracting coalbed gases from coal mines by upper and lower combination
CN102383828B (en) Refection reducing and outburst eliminating method for deep-hole hydraulic fracture driving gas shallow hole extraction
RU2683438C1 (en) Method of increasing gas permeability for methane wells in coal seams with the using of blowout technology by explosion under the influence of electric impulses
CN103924975B (en) A kind of for the water-retaining method in coal mining process
CN106368733B (en) A kind of coal seam with gas hydraulic fracturing is with being acidified combined reinforced anti-reflection appraisal procedure
CN102518436B (en) Method for controlling tectonic rock burst in coal mine tunneling
CN102654049B (en) Porous linear control hydraulic fracturing method
CN102720528B (en) Underground coal mine repeating pulsation hydrofracture strengthened gas extracting method
CN101403314A (en) Coal mine down-hole drilling hydraulic fracturing anti-reflection mash gas extraction technique
CN104863628B (en) One kind utilizes the anti-reflection shielding coal roadway tunneling method of pulse detonation wave fracturing
CN105275443B (en) A kind of underground coal mine high power electric detonation shake auxiliary hydraulic fracturing anti-reflection method

Legal Events

Date Code Title Description
PB01 Publication
C06 Publication
SE01 Entry into force of request for substantive examination
C10 Entry into substantive examination
GR01 Patent grant
C14 Grant of patent or utility model