CN104895543A - Method for extracting methane from coal beds - Google Patents
Method for extracting methane from coal beds Download PDFInfo
- Publication number
- CN104895543A CN104895543A CN201410286161.1A CN201410286161A CN104895543A CN 104895543 A CN104895543 A CN 104895543A CN 201410286161 A CN201410286161 A CN 201410286161A CN 104895543 A CN104895543 A CN 104895543A
- Authority
- CN
- China
- Prior art keywords
- coal
- coal seam
- methane
- country rock
- coal bed
- Prior art date
- Legal status (The legal status 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 status listed.)
- Granted
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/006—Production of coal-bed methane
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
- E21B43/263—Methods for stimulating production by forming crevices or fractures using explosives
Abstract
A method for extracting methane from coal beds includes creating acoustic, electrical, mechanical and hydrodynamic compressive/tensile stresses by applying periodic short pulses generated via the explosion of a calibrated conductor located in the operating range of a well of a source of oscillations, the energy of which is fed to the coal bed. A slotted perforation is created in the well, said perforation being oriented along the directions of the main stresses in the coal bed, an additional slotted perforation is created in penetrating rock which encompasses the coal bed, and the additional slotted perforation is directed along the directions of the main stresses of the rock encompassing the coal bed, enhancing the acoustic and hydrodynamic cavitation of gas bubbles emitted from the coal, cracks, microcracks, pores, micropores, capillaries and microcapillaries of the coal bed, and also from the cracks and microcracks created in the penetrating rock encompassing the coal bed. The technical result of the proposed method consists in increasing coal methane production, in reducing energy consumption, and in increasing the safety and environmental-friendliness of the process.
Description
Technical field
The present invention relates to the method by reclaiming methane from coal seam and permeable country rock with plasma panel physical efficiency excitation cycle, described plasma is applied to producing coal layer by groove perforation and is applied to permeable country rock, described groove perforation is directed with the correction value of the vector direction of the main stress bar caused that exploded by the metallic conductor calibrated, cause being arranged on the plasma pulse generator of being bored a hole in the operating interval in the vertical shaft hole of opening by groove and produce broadband, directed short interval high-voltage pulse, for starting the tension and compression stress in coal seam, appearance sound and hydrodynamical cavitation, it promotes the formation of the huge pattern of abnormal micro-fracture, and produce from coal, crackle, micro-crack, micropore, capillary tube and microcapillary and the condition from permeable country rock farthest desorption of methane.
Background technology
Method for all prior aries reclaiming methane is mainly only to reclaim gas from coal seam, and does not provide from permeable country rock and reclaim methane, and it will fail to provide the maximum employment security of miner in future.Known adopted method is:
-around well, wash away coal seam by utilizing nature coal and non-coal to break out;
-by hydrodynamic drag, introduce on the stratum in coal storage district and maintain and automatically damage;
-water and air (and carbon dioxide) is injected coal seam;
-reclaim methane gas from single diameter well and multilateral well;
-around well, form cavity;
-reclaim methane gas by drawing-off gas hole;
-fracturing coal seam.
But, as the fact by a large amount of vertical shaft and horizontal well that do not produce methane confirm, described method is expensive, waste time and energy, environment is dangerous, energy digestion is large and efficiency is low.
Also known disclosed in United States Patent (USP) 2005/009831A1 and United States Patent (USP) 2006/0108111A1 method, these patents propose, and coal seam should from surface be subject to physics and acoustic excitation by setting sounding device in the shaft at sunshine.
But being subject to encouraging from surface at sunshine (US2005/009831A1) is power consumption, and wide-band vibration energy weakens along with the coal seam degree of depth.In addition, this excitation is that environment is unsafe, and may on there being uncertain impact near the region of fracture.
In order to increase permeability, the sounding device (United States Patent (USP) 2005/009831A1 and United States Patent (USP) 2006/0108111A1) arranged in the shaft sends a frequency, and be polyfactorial nonlinear dynamic system containing the coal bed of methane, the multi-frequency oscillation of its lasting self―sustaining instability, it seems to be separated basic frequency, therefore can not solve and increase permeable problem from the quite large distance of driving source.
The known method disclosed in patent RU2254451, IPC Е 21/B43/112 and patent RU2369728 for well slot perforation.But groove leaks and only occurs in wellbore region, and does not diffuse into whole coal seam.
The known method disclosing plasma pulse excitation production of hydrocarbons layer in patent RU2248591, RU2373386, RU2373387 and in United States Patent (USP) 2014/0027110A1.But all described methods both provide by accumulation perforation or at open wellhole moderate stimulation production of hydrocarbons layer.Accumulation perforation compromises and starts the validity of plasma pulse, and when in open wellhole, due to coal plasticity and fragility, can cause subsiding and the bonding of plasma pulse equipment of shaft bottom district.In addition, all described methods do not provide and reclaim methane from permeable country rock.
Summary of the invention
The technique effect of the inventive method is the output increasing coalbed methane, reduces energy ezpenditure, and improves safety and the environment friendly of process.
This technique effect is that the described method by reclaiming methane from coal seam realizes, described method is that repeating the excitation of short interval pulse by use produces sound, electricity, machinery and hydrodynamic force tension and compression stress, describedly repeat short interval pulse and produced by the blast of the calibration conductor of the vibration source be arranged in the operating interval of well, the energy of blast is applied to coal seam.In the case, groove perforation is formed in well, it is along the direction orientation of the main stress bar in coal seam, extra groove perforation is formed in the country rock of permeable coal seam, and the direction of extra groove perforation is the direction orientation along the main stress bar in the country rock of coal seam, described coal seam country rock enhances the coal from coal seam, crackle, micro-crack, hole, micropore, capillary tube, the sound of the bubble that microcapillary and the crackle produced in the country rock of permeable coal seam and micro-crack send and hydrodynamical cavitation, this facilitate the more multiple cracks in the development of the pattern of the abnormal micro-fracture in coal seam and permeable coal seam country rock and micro-crack, and make desorb and the maximizes diffusion of methane.
Accompanying drawing explanation
Now will by technical scheme required for protection Fig. 1 to 5 illustrate.
Fig. 1 is the schematic diagram of the periodicity exercising result of plasma energy on coal bed.
Fig. 2 is the part in the coal seam (sample) before and after the method protected by application claims is encouraged.
Fig. 3 is the faultage image in the coal seam (sample) after the method protected by application claims is encouraged.
Fig. 4 is the performance parameter of the well before and after the method protected by application claims is encouraged.
Fig. 5 is the impact of repetition pulse on the stress state in coal seam.
Detailed description of the invention
Through any distortion producing coal layer and simultaneously through more how permeable country rock well (see Fig. 1) operating interval in groove perforation combination can make by plasma start produced shock wave when there is no obstacle radial penetration in coal seam and country rock, and stand periodic pulse repetition, tension and compression stress is repeated to produce, and it allows (due to synergy: micro-fracture, cavitation, heat and quality transmission, capillary release in capillary tube, the appearance of the concentrated diffusion of the power of being accumulated by external energy) within the scope of maximum possible, reclaim methane when not taking other additionally to improve capacity operation.
Described method makes by groove perforation directly contact coal seam and permeable country rock, consider the physics of coal seam and permeable country rock, machinery and geological characteristics, and, as the result of the directed periodically wideband pulse excitation according to development plan and Mathematical Modeling, produce the effect that the nature of coal seam along with active methane desorb and diffusion regulates.
The program being applied to the periodicity broadband plasma body pulse excitation in coal seam by groove perforation makes the yield maximization of methane by successfully using following natural details:
-the coal bed that retrained by country rock is the system of porous in essence under overload, does not usually have rock mass consolidation;
-vertical the intrusion of fluid (water) of being permeated by coal bed is by capillary tube and GRAVITY CONTROL;
-coal seam has the higher capillary pressure of lower Penetration Signature; Alternatively, coal seam and rock have the lower capillary pressure of higher Penetration Signature;
-capillary pressure raises when coal seam water saturation reduces, and promotes gas desorption and diffusion process;
The mechanical strength of-coal is far below the mechanical strength of other rocks, and it can not bear more precipitous excitation gradient and not break.There is an antinomy to be called Bridgman effect, namely when stress relieving and when not applying, the scission of link in coal occurs.Under these conditions, coal fragments into the thin layer of wafer-like;
-when being subject to stress and there is sound conductivity high than usual, coal seam presents character that is non-equilibrium, dissipation transmission medium, wherein, maintains natural frequency confusion by external energy (tide, distant shock, the blast operations in outlying district in exploitation);
-according to electrical property, most coal belongs to semiconductor and conductor.The plasma pulse excitation of coal seam or permeable country rock produces and the charged fluid in the saturated with fluid medium of porous moves relevant machinery and concentration extension.External force presents and has dynamic electricity source, and each pulses generation electric field; This develops into the energy of different field; And along with the stopping of pulse excitation, the external energy of accumulation recovers with its original form, and it has some to lose.
Gas saturation containing the coal seam of methane is made up of four components:
--the non-associated gas body-5-6% of filler opening and crackle;
--be adsorbed on the gas (gas absorption and volume are filled)-28 to 35% on the wall of micropore, capillary tube and crackle;
--be included in gas-40 in coal body to 50% with dissolved form;
--be partly dissolved in the gas in moisture film, in the case, according to Henry's law, gas solubility is in aqueous directly proportional to pressure and the degree of depth increases-3 to 8%.
The base substance of the methane molecule in gassiness coal bed distributes in whole coal body, so the concept of interstitial solid solution is applicable to methane-coal system.According to coal seam adsorption curve, the methane molecule invaded in volume does not take empty position of a crystal lattice, but the room in solid.
The unique method of air release is diffusion mechanism.In order to start it, must make coal in stress release process, be dispersed into size about 10
-6the particle of cm.Methane concentration in coal will reduce at double, and it will discharge as free gas.
Coal dispergation can be caused and cause the exclusive mechanism that abnormal micro-fracture pattern develops to be the bubble blast be immersed in coal bed texture, it actively launches starting in the process of periodically directed broadband plasma body pulse excitation, wherein periodically the pulse excitation of directed broadband plasma body is bored a hole by groove and is directly arrived coal seam, therefore creates sound and hydrodynamical cavitation.
The water that infiltration has the coal seam of dissolved gas is weak, and it is owing to the seed that there is cavitation wherein.They soak coal surface deficiently and have the crackle of gas filling and the coal particles of micro-crack.
When producing plasma near operating groove interval, sound to be radiated in fluid more than the acoustic pressure of 100dB, to cause on the cavitation seed comprising gaseous inclusion in a fluid and audible device vibration surface on form cavitation bubble in the half period process of discharging.Can destroy in compression half cyclic process of (in units of microsecond) the in short-term pressure up to 10000kg/sq.cm stronger than coal material in generation, bubbles burst.
The bench test being placed on the directed periodically broadband plasma body pulse excitation of the coal sample of blast area confirms that dispergation effect and coal are divided into wafer-like thin slice (see Fig. 2).
Stood the tomoscan inspection display of the sample of periodically broadband plasma body pulse excitation by groove perforation, the development of the micro-fracture in sample and most of micro-crack is orthogonal to the direction extension of coal bed.
In the Taldinsk mining area of Kuzbas, in the well UM-5.9 with groove perforation, using plasma pulsing techniques confirms, the rear excitation of six permeabilitys containing methane coal bed increases (see Fig. 4).
In area, Chinese table mountain, in the coal bed with 0.014mD permeability, using plasma pulsing techniques confirms, methane enters in well and coal bed permeability is increased, and tension and compression stress propagation is to the distance more than 200 meters, it is along with positive methane release (Fig. 5).
The economic benefits realized by work of the present invention are actually, and produce the gas of maximum volume with the environment friendly of minimum energy, high security and process from coal seam from more how permeable country rock.
Above-mentioned benefit is achieved by the inventive method comprising following steps:
-detect in advance containing the coal bed place of methane vertically drill (or use old exploitation/undeveloped well),
-along wellhole determination coal bed thickness,
-determine the permeability of coal grade composition, reservoir pressure, temperature, the hydrology, porosity and coal seam and country rock;
The gas experiment in-coal seam,
-take coal bed containing methane to by repeating short interval, directed broadband high-voltage pulsed source, comprise and directly take coal seam and permeable country rock to by the groove perforation in the operating interval of Vertical Well,
-by the energy of plasma that produced by the blast of the metallic conductor calibrated, encourage coal bed and permeable country rock with the form repeating directed compression and the short interval high pressure pulse that stretches; In the case, high-voltage pulse quantity and containing the excitation in each interval of methane coal bed duration by along the coal bed thickness of wellhole, coal rock physics and grade composition and determined by the Characteristics of Geotechnical Engineering of permeable country rock.
Produce methane by the present invention's method required for protection to be undertaken by vertical shaft at the coal bed containing methane; under the described coal bed containing methane is in overload load; described vertical shaft is from surface probing at sunshine; and with the shell setting of casing of different-diameter; there is groove perforation in operating interval, described operating interval unloading coal seam and permeable country rock.
Fig. 1 is the schematic diagram of the periodicity exercising result of plasma energy on coal bed.In the case, (perforate in advance) well that employing can start immediately, determine the coal seam thickness along wellhole, find the grade composition of coal and permeable characteristics of surrounding rock, therefore, repeat short interval, directed broadband high pressure clock to be bored a hole the coal bed be brought to containing methane by the groove in the operating interval of vertical shaft, and coal bed excitation starts with the form repeating directed short interval high pressure pulse, in the case, the quantity of high pressure pulse and containing duration of the excitation in each interval of the coal bed of methane by the coal bed thickness along wellhole, the grade composition of coal, and determined by the characteristic of country rock.Repeat the energy excitation that short interval, directed broadband high pressure clock passes through the plasma produced by the blast of the metallic conductor calibrated.In itself, repeating short interval, directed broadband high pressure clock is plasma pulse generator in essence.Usually, the operation of this provenance is as follows: the high-tension current from the 3000-5000V in the storehouse of energy-storage capacitor is applied to electrode, and described electrode by the calibration conductor closes causing it to explode, and limits plasma generation.In blast process, fault offset, and become the state forcing hot gas with very high pressure, this High Voltage heated air produces shock wave again, described shock wave affects environment with very large power and causes it to compress, this is continued until that surge equals coal seam pressure, and therefore, coal bed starts towards the well expansion with driving source.The periodicity short interval wideband pulse of multiple repetitions in the medium with the satisfactory electrical conductivity harmony conductivity causing compression and tensile stress causes the development of Natural regulation of the pattern of abnormal micro-fracture in coal seam, cavitation, heat and mass exchange and coal bed, this facilitates the maximization of methane desorb.
If there is more permeable country rock, plasma pulse excitation is also carried out in this rock, because methane is diffused in more how permeable rock, in this case, its amount may exceed the amount of the methane in coal seam.Permeable country rock is similar to the reservoir producing oil and natural gas, and without coal dust, therefore, it will be high as far as possible that gas reclaims.
Claims (1)
1. one kind is reclaimed the method for methane from coal seam, described method is that repeating the excitation of short interval pulse by use produces sound, electricity, machinery and hydrodynamic force tension and compression stress, describedly repeat short interval pulse and produced by the blast of the calibration conductor of the vibration source be arranged in the operating interval of well, the energy of blast is applied to coal seam, wherein, groove perforation is carried out in described well, described groove perforation is along the direction orientation of the main stress bar in coal seam, extra groove perforation is carried out in the country rock of permeable coal seam, and the direction of described extra groove perforation is the direction orientation along the main stress bar in the country rock of described coal seam, described coal seam country rock enhances the coal from described coal seam, crackle, micro-crack, hole, micropore, capillary tube, the sound of the bubble that microcapillary and the crackle produced in the country rock of described permeable coal seam and micro-crack send and hydrodynamical cavitation, which promote the more multiple cracks in the development of the pattern of the abnormal micro-fracture in described coal seam and described permeable coal seam country rock and micro-crack, and make desorb and the maximizes diffusion of methane.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| RU2014108013 | 2014-03-04 | ||
| RU2014108013/03A RU2554611C1 (en) | 2014-03-04 | 2014-03-04 | Method of methane extraction from coal seam |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104895543A true CN104895543A (en) | 2015-09-09 |
| CN104895543B CN104895543B (en) | 2018-04-24 |
Family
ID=53498569
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410286161.1A Active CN104895543B (en) | 2014-03-04 | 2014-06-24 | From the method for seam mining methane |
Country Status (8)
| Country | Link |
|---|---|
| EP (1) | EP3115547A4 (en) |
| CN (1) | CN104895543B (en) |
| AU (2) | AU2014203426A1 (en) |
| CA (1) | CA2928816C (en) |
| EA (1) | EA033490B1 (en) |
| HK (1) | HK1210246A1 (en) |
| RU (1) | RU2554611C1 (en) |
| WO (1) | WO2015133938A2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112780243A (en) * | 2020-12-31 | 2021-05-11 | 中国矿业大学 | Integrated reinforced coal seam gas extraction system and extraction method |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2626104C1 (en) * | 2016-07-15 | 2017-07-21 | Общество с ограниченной ответственностью "Георезонанс" | Method for prliminary degassing of coal beds |
| CN114934765B (en) * | 2022-05-19 | 2022-12-06 | 贵州一和科技有限公司 | Method for enhancing gas extraction efficiency by combining hydraulic joint cutting and loosening blasting of coal roadway |
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| SU1765465A1 (en) * | 1990-08-07 | 1992-09-30 | Государственный Макеевский Научно-Исследовательский Институт По Безопасности Работ В Горной Промышленности | Method of pulsed action on gas-bearing coal bed |
| RU2129209C1 (en) * | 1996-12-09 | 1999-04-20 | Акционерная нефтяная компания "Башнефть" | Device for slot perforation of wall in well |
| DE10320402A1 (en) * | 2003-05-06 | 2004-11-25 | Udo Adam | Methane extraction method for diminishing or unstable mountains, involves placing pipes having slots and perforations into bore holes that are drilled into mountain |
| CN101004133A (en) * | 2007-01-17 | 2007-07-25 | 中国兵器工业第二一三研究所 | Sound wave shock and pulse combustion type pressing crack apparatus |
| CN201045293Y (en) * | 2006-12-13 | 2008-04-09 | 中国兵器工业第二一三研究所 | High dense holes multilevel pulse sand carrying compound perforation device |
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| CN102865058A (en) * | 2012-09-14 | 2013-01-09 | 中北大学 | Multi-pulse synergistic perforation device |
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2014
- 2014-03-04 RU RU2014108013/03A patent/RU2554611C1/en active
- 2014-06-24 AU AU2014203426A patent/AU2014203426A1/en not_active Abandoned
- 2014-06-24 CN CN201410286161.1A patent/CN104895543B/en active Active
-
2015
- 2015-03-27 CA CA2928816A patent/CA2928816C/en active Active
- 2015-03-27 WO PCT/RU2015/000188 patent/WO2015133938A2/en active Application Filing
- 2015-03-27 EA EA201650012A patent/EA033490B1/en not_active IP Right Cessation
- 2015-03-27 AU AU2015224617A patent/AU2015224617B2/en not_active Ceased
- 2015-03-27 EP EP15758369.1A patent/EP3115547A4/en not_active Withdrawn
- 2015-10-30 HK HK15110766.4A patent/HK1210246A1/en unknown
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| SU1765465A1 (en) * | 1990-08-07 | 1992-09-30 | Государственный Макеевский Научно-Исследовательский Институт По Безопасности Работ В Горной Промышленности | Method of pulsed action on gas-bearing coal bed |
| RU2129209C1 (en) * | 1996-12-09 | 1999-04-20 | Акционерная нефтяная компания "Башнефть" | Device for slot perforation of wall in well |
| DE10320402A1 (en) * | 2003-05-06 | 2004-11-25 | Udo Adam | Methane extraction method for diminishing or unstable mountains, involves placing pipes having slots and perforations into bore holes that are drilled into mountain |
| CN201045293Y (en) * | 2006-12-13 | 2008-04-09 | 中国兵器工业第二一三研究所 | High dense holes multilevel pulse sand carrying compound perforation device |
| CN101004133A (en) * | 2007-01-17 | 2007-07-25 | 中国兵器工业第二一三研究所 | Sound wave shock and pulse combustion type pressing crack apparatus |
| RU2369728C2 (en) * | 2007-08-28 | 2009-10-10 | Валерий Степанович Вячеславов | Sector method of fissure hydro-mechanical perforation of well |
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| CN102865058A (en) * | 2012-09-14 | 2013-01-09 | 中北大学 | Multi-pulse synergistic perforation device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112780243A (en) * | 2020-12-31 | 2021-05-11 | 中国矿业大学 | Integrated reinforced coal seam gas extraction system and extraction method |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2015133938A3 (en) | 2015-11-05 |
| EA201650012A1 (en) | 2017-05-31 |
| WO2015133938A2 (en) | 2015-09-11 |
| EP3115547A2 (en) | 2017-01-11 |
| CA2928816C (en) | 2018-03-13 |
| AU2015224617B2 (en) | 2017-08-10 |
| EA033490B1 (en) | 2019-10-31 |
| RU2554611C1 (en) | 2015-06-27 |
| HK1210246A1 (en) | 2016-04-15 |
| AU2015224617A1 (en) | 2016-04-21 |
| CN104895543B (en) | 2018-04-24 |
| CA2928816A1 (en) | 2015-09-11 |
| AU2014203426A1 (en) | 2015-09-24 |
| EP3115547A4 (en) | 2017-12-06 |
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