CN103148888B - A kind of coalbed methane reservoir bilayer closes adopts High Temperature High Pressure mining dynamic estimation system - Google Patents
A kind of coalbed methane reservoir bilayer closes adopts High Temperature High Pressure mining dynamic estimation system Download PDFInfo
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Abstract
The invention discloses a kind of coalbed methane reservoir bilayer to close and adopt High Temperature High Pressure mining dynamic estimation system, comprise coal-seam gas entrance and close and outpour mouth and closes the High Temperature High Pressure mining dynamic evaluation instrument that the High Temperature High Pressure mining dynamic evaluation instrument adopted and entrance dispensing outlet conjunction adopt; This High Temperature High Pressure mining dynamic evaluation instrument by displacement module, rock core self-clamping module, end Fluid Dynamics module, confined pressure and back pressure module, vacuumize module, metering module, temperature control and data acquisition module and form.Two cover experimental facilitiess provided by the invention are evaluated coal-seam gas bilayer specially and are closed feasibility, rationality, science and the utility of adopting, Simulation evaluation separately critical desorption pressures in reservoir, reservoir pressure reduction, feed flow change, permeability contrast, aerogenesis working fluid level difference closes the impact of drainage and mining parameters under condition of adopting on bilayer, Simulation evaluation bilayer closes the impact on above parameter when adopting, and then double-deck conjunction of optimization adopts mining scheme, promote straight well per-well production, improve recovery ratio, promote the fast, efficient, safe exploitation of coal-seam gas.
Description
Technical field
The invention belongs to cbm exploration and development technique field, particularly relate to the conjunction of a kind of coalbed methane reservoir bilayer and adopt High Temperature High Pressure mining dynamic estimation system.
Background technology
" coal-seam gas (coal-mine gas) develops " 12 " planning " of country's appearance in 2012 points out, to China's coal-seam gas added reserves 1.0 × 10 in 2015
12m
3, output will reach 300 × 10
8m
3, wherein ground drilling 160 × 10
8m
3, build Qinshui basin, Eastern Margin of Ordos Basin coal bed methane industrial base.But China's coal-seam gas exists geology occurrence condition complex, resource verifies the features such as rate is low, development difficulty is large, make exploiting coal bed methane high to exploitation technical requirement.There are two large subject matters in current China coal-seam gas: recovery ratio is low and utilization factor is low, seriously constrain coal-seam gas high efficient rational development to utilize, a lot of research work has been carried out in order to improve the domestic and international researchist of coal-seam gas recovery ratio, propose fracturing of separate layers, horizontal well and pinniform well technology, the correlation techniques such as rational mining system, but down-hole recovery ratio only has about 23% at present, and the average recovery ratio of U.S.'s coal-seam gas is 50%.
The technology of adopting of closing coal-seam gas bilayer can reduce individual well investment, and the per-well production of larger lifting coal-seam gas straight well improves coal seam recovery ratio.
Domestic for same block adjacent coal bed conjunction layer mining theory and technology at present, scholar is not almost had to carry out careful and systematic research, people often indiscriminately imitate rock gas theory, but there is basic difference between rock gas and the occurrence status of coal-seam gas, the two gas production mechanism is obviously different, and when causing developing coal-seam gas, exploitation effect is often not fully up to expectations.Can conjunction be adopted and be realized " 1+1 " and be more than or equal to 2, does is namely the gas production rate of two-layer coal conjunction layer mining more than or equal to individual layer mining gas production rate sum? when double-deck conjunction is adopted, respective reservoir permeability difference, fluid supply capacity change in each layering, how does each zonal pressure gradient change? the critical desorption pressures in coal seam, reservoir pressure reduction, coal seam buried depth is poor, fluid supply capacity, what impact do pressure gradient and coal reservoir fracture system close to have adopted to bilayer? when double-deck conjunction is adopted, how does each hierarchy parameters change? these were all only analyzed in theory, and do not verify by experiment.When double-deck conjunction is adopted, how do fluid supply capacity change, each zonal pressure gradient change in respective reservoir permeability difference, each layering? respectively to the influence degree of drainage and mining parameters how? how this regulates parameters to optimize mining working system, reaches the object of maximum efficient rate.Do not have special experimental facilities Simulation evaluation bilayer to close the experimental facilities adopted at present both at home and abroad, cause mining site practice and theory not meet.
Summary of the invention
The object of the invention is to utilize a kind of coalbed methane reservoir bilayer to close and adopt High Temperature High Pressure mining dynamic estimation system, being intended to solve does not have special experimental facilities Simulation evaluation bilayer to close the experimental facilities adopted at present both at home and abroad, by critical desorption pressures in equipment simulating evaluation separately reservoir, reservoir pressure reduction, feed flow changes, permeability contrast, the impact of aerogenesis working fluid level difference when bilayer conjunction is adopted on drainage and mining parameters, optimize double-deck conjunction and adopt drainage and mining parameters, reduce individual well investment, promote coal bed gas well per-well production, improve double-deck conjunction and adopt water pumping gas production institution efficiency, realize effect that " 1+1 " is more than or equal to 2, improve coal-seam gas recovery ratio, promote that coal-seam gas is quick, efficiently, the problem of security development.
The object of the present invention is to provide a kind of coalbed methane reservoir bilayer to close and adopt High Temperature High Pressure mining dynamic estimation system, described coalbed methane reservoir bilayer closes to be adopted High Temperature High Pressure mining dynamic estimation system and comprises closing for coal-seam gas entrance and outpour mouth and closes the High Temperature High Pressure mining dynamic evaluation instrument that the High Temperature High Pressure mining dynamic evaluation instrument adopted and entrance dispensing outlet conjunction adopt;
Described entrance closes and outpours mouth and close and adopt High Temperature High Pressure mining dynamic evaluation instrument and the outlet of entrance dispensing and close the High Temperature High Pressure mining dynamic evaluation instrument adopted and comprise respectively:
Displacement module, for simulate mining site bilayer close adopt actual water pumping gas production time, provide that rock sample is saturated, the different fluid supply capacity of flowing displacement power and simulation 3# coal seam, 15# coal seam;
Rock core self-clamping module, with described displacement module, end Fluid Dynamics module, confined pressure and back pressure module, vacuumize module, metering module, temperature control and data acquisition module and be connected, be derived from 3# coal seam for adopting, different permeability simulated by the true rock sample in 15# coal seam, different pressures gradient, different critical resolve pressure, different produce liquid level on bilayer close adopt time water pumping gas production parameter impact, and simulation is under set mining scheme, the situation of change of each zonal pressure gradient, production fluid face, permeability;
End Fluid Dynamics module, is connected with described rock core self-clamping module, for simulating in coal-seam gas gas well water pumping gas production process, and the moisture situation of each bottom;
Confined pressure and back pressure module, be connected with described rock core self-clamping module, sand face pressure and working fluid level situation of change when confined pressure change and mining site water pumping gas production suffered by reservoir country rock during for simulating mining site water pumping gas production;
Vacuumizing module, be connected with described rock core self-clamping module, making for being evacuated by rock core in rock core self-clamping module methane gas fully and the abundant Contact-sorption of rock sample simulate water environment at the bottom of reservoir with stratum water saturation;
Metering module, is connected with described rock core self-clamping module, for simulating mining site gas well separate measurement device;
Temperature control and data acquisition module, for simulating the inner actual temperature of reservoir and water production rate rock core self-clamping module import and export pressure, rock core diverse location pressure distribution situation, the different confined pressure pressure of each layering, the different back pressure pressure of each layering, different layering inner fluid speed, pressure gradient distribution, metering system obtained, gas production rate are automatically recorded in time by sensor and data acquisition panel.
Further, described entrance closes and outpours mouth and close and adopt High Temperature High Pressure mining dynamic evaluation instrument and arrange a displacement module, described displacement module is formed primarily of methane displacement pump, one-way cock, methane piston container, local water displacement pump, local water piston container, six-way valve, 3# coal seam rock core entrance point pressure transducer, 15# coal seam rock core entrance point pressure transducer, and concrete structure is:
Methane displacement pump connects one-way cock through pipeline, retaining valve connects methane piston container, and methane piston container to be connected with retaining valve after six-way valve and 3# coal seam rock core entrance point pressure transducer, 15# coal seam rock core entrance point pressure transducer through pipeline and to be connected with the import of rock core self-clamping module; Local water displacement pump connects one-way cock through pipeline, and retaining valve connects local water piston container, and local water piston container is connected six-way valve through pipeline with retaining valve and is connected with rock core self-clamping module.
Further, described entrance dispensing outlet is closed the High Temperature High Pressure mining dynamic evaluation instrument adopted and is provided with the identical displacement module of two structures, described displacement module is formed primarily of methane displacement pump, one-way cock, methane piston container, 3# coal seam local water displacement pump, 3# coal seam local water piston container, 15# coal seam local water displacement pump, 15# coal seam local water piston container, threeway, six-way valve, 3# coal seam rock core entrance point pressure transducer, 15# coal seam rock core entrance point pressure transducer, and concrete structure is:
Methane displacement pump connects one-way cock through pipeline, retaining valve connects methane piston container, and methane piston container to be connected with retaining valve after six-way valve and 3# coal seam rock core entrance point pressure transducer, 15# coal seam rock core entrance point pressure transducer through pipeline and to be connected with 3# coal seam, the rock core self-clamping module import of 15# coal seam respectively; 3# coal seam local water displacement pump connects one-way cock through pipeline, and retaining valve connects 3# coal seam local water piston container, and 3# coal seam local water piston container is connected six-way valve through pipeline with retaining valve and is connected with 3# coal seam rock core self-clamping module entrance point; 15# coal seam local water displacement pump connects one-way cock through pipeline, and retaining valve connects 15# coal seam local water piston container, and 15# coal seam local water piston container is connected with 15# coal seam rock core self-clamping module entrance point after retaining valve connecting tee through pipeline.
Further, described rock core self-clamping module also comprises: 3# coal seam rock sample clamper, 15# coal seam rock sample clamper, steel cylinder, gum cover, Di Shui inlet opening, end water tank, entrance point impurity filter screen, endpiece dust filter unit, rock sample internal monitoring pressure transducer;
Two core holding unit structures are identical, are core chamber in the middle of clamper, water tank at the bottom of core chamber's lower end connection, water hole at the bottom of one is arranged at water tank bottom, the end, water hole, end rubber connecting sleeve, and whole core chamber wraps up by gum cover, gum cover outside is steel cylinder, is full of hydraulic oil between steel cylinder and gum cover; Core chamber front end connects entrance point impurity filter screen, rear end connection outlet end dust filter unit; Core chamber's intermediate distribution rock sample internal pressure sensor
Further, Fluid Dynamics module also comprises: water pressure sensor at the bottom of water pressure sensor, 15# coal seam at the bottom of water management six-way valve, 3# coal seam at the bottom of water management six-way valve, 15# coal seam at the bottom of water injection pump, 3# coal seam local water piston container, 15# coal seam local water piston container, 3# coal seam at the bottom of water injection pump, 15# coal seam rock sample at the bottom of the rock sample of 3# coal seam at the described end;
Water injection pump at the bottom of the rock sample of 3# coal seam connects 3# coal seam local water piston container through pipeline, 3# coal seam local water piston container connects water management six-way valve at the bottom of 3# coal seam, and at the bottom of three Di Shui inlet openings of water management six-way valve at the bottom of 3# coal seam and 3# coal seam core holding unit, 3# coal seam, water pressure sensor is connected; Water injection pump at the bottom of the rock sample of 15# coal seam connects 15# coal seam local water piston container through pipeline, 15# coal seam local water piston container connects water management six-way valve at the bottom of 15# coal seam, and at the bottom of three Di Shui inlet openings of water management six-way valve at the bottom of 15# coal seam and 15# coal seam core holding unit, 15# coal seam, water pressure sensor is connected.
Further, described confined pressure and back pressure module are referred to as control pressurer system, comprising: 3# coal seam confined pressure pump, 3# coal seam confined pressure retaining valve, 3# coal seam confined pressure pressure transducer, 15# coal seam confined pressure pump, 15# coal seam confined pressure retaining valve, 15# coal seam confined pressure pressure transducer and backpressure pump, back pressure pressure transducer, check valve;
3# coal seam confined pressure pump connects 3# coal seam confined pressure retaining valve, and 3# coal seam retaining valve is connected with 3# coal seam core holding unit confined pressure entrance point after connecting 3# coal seam confined pressure pressure transducer; 15# coal seam confined pressure pump connects 15# coal seam confined pressure retaining valve, and 15# coal seam retaining valve is connected with 15# coal seam core holding unit confined pressure entrance point after connecting 15# coal seam confined pressure pressure transducer; Backpressure pump connects check valve through back pressure pressure transducer, and check valve is connected with rock core self-clamping module endpiece.
Further, vacuumize module described in also to comprise: vacuum pump, vacuum valve;
Vacuum pump connects vacuum valve, and vacuum valve is connected with 3# coal seam rock core self-clamping module, 15# coal seam rock core self-clamping module after six-way valve.
Further, described metering module also comprises: bidirectional control valve, rock core top hole pressure monitoring sensor, circular filter core, gas-liquid automatic segregator, automatic gas mass flowmeter, electronic balance;
Bidirectional control valve is connected with circular filter core, circular filter core is connected with gas-liquid automatic segregator after check valve, gas-liquid automatic segregator is connected with electronic balance, automatic gas mass flowmeter, electronic balance is arranged at the bottom of gas-liquid separator, and automatic gas mass flowmeter is arranged at the left side of gas-liquid automatic segregator.
Further, described displacement module, rock core self-clamping module, end Fluid Dynamics module installation are in temperature control box inside;
Described temperature control and data acquisition module comprise 16 pressure transducers, data acquisition board, computer systems; Data acquisition board is positioned at temperature control box outside, connects computer system; Three pressure transducers are distributed in visual self-clamping module import and export end, eight are arranged at visual core holding unit inside, a pressure transducer is arranged in the back pressure module of confined pressure and back pressure module, two are arranged in the confined pressure module of confined pressure and back pressure module, and two are arranged in end Fluid Dynamics module.
Coalbed methane reservoir provided by the invention bilayer closes adopts High Temperature High Pressure mining dynamic estimation system, close by adopting entrance outpour mouth close adopt High Temperature High Pressure mining dynamic evaluation instrument, High Temperature High Pressure mining dynamic evaluation instrument is adopted in entrance dispensing outlet conjunction; For the singularity of coal-seam gas self, propose the conjunction of coal-seam gas bilayer first and adopt raising recovery efficiency technique thinking; Design, manufacture two covers and under the on-the-spot high-temperature and high-pressure conditions of lab simulation coal-seam gas, double-deck conjunction can adopt Physical Experiment equipment, fill up domestic conjunction about coal-seam gas bilayer and adopted physical simulation techniques blank, adopted further developing of technology for the conjunction of coal-seam gas bilayer and established solid foundation; The square true core of large scale is adopted to carry out Adsorption and desorption, diffusion, the research of seepage flow displacement test, Di Shui inlet opening and end water tank is adopted to simulate end water and working fluid level situation of change first, simulate mining site pressure and temp condition first, more press close to the actual conditions of reservoir; Under the present invention of coal-seam gas industry considers generation coal dust transport conditions first, close the change of producing water, aerogenesis when adopting; Can carry out and evaluate each layering permeability contrast, each zonal pressure gradient difference opposite sex, each layering fluid supply capacity difference, the involutory dynamic effects experimental study adopting effect of working fluid level change; Optimize conjunction and adopt water pumping gas production system, improve recovery ratio; Achieve experimentation unmanned, the full-automatic record of data.Data acquisition module can by the pressure of modules, flow velocity, product water, the full-automatic record of aerogenesis data, and physical record data are quick, accurate, automaticity high.
Accompanying drawing explanation
Fig. 1 is that the coalbed methane reservoir bilayer that the embodiment of the present invention provides closes the structured flowchart adopting High Temperature High Pressure mining dynamic estimation system;
Fig. 2 is that the entrance conjunction that the embodiment of the present invention provides outpours the structured flowchart that High Temperature High Pressure mining dynamic evaluation instrument is adopted in mouth conjunction;
Fig. 3 is that the structured flowchart adopting High Temperature High Pressure mining dynamic evaluation instrument is closed in the entrance dispensing outlet that the embodiment of the present invention provides;
Fig. 4 is that the entrance that provides of the embodiment of the present invention closes and outpours mouth and close and adopt High Temperature High Pressure mining dynamic evaluation instrument structural representation;
Fig. 5 is that High Temperature High Pressure mining dynamic evaluation instrument structural representation is adopted in the entrance dispensing outlet conjunction that the embodiment of the present invention provides.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
The 3# coal seam marked herein, 15# coal seam are that China's Qinshui basin actual formation divides title.
The coalbed methane reservoir bilayer that Fig. 1,2,3 shows the embodiment of the present invention to be provided closes the structure of adopting High Temperature High Pressure mining dynamic estimation system.Illustrate only part related to the present invention for convenience of explanation.
This coalbed methane reservoir bilayer closes to be adopted High Temperature High Pressure mining dynamic estimation system and comprises: entrance closes and outpours mouth and close and adopt High Temperature High Pressure mining dynamic evaluation instrument and High Temperature High Pressure mining dynamic evaluation instrument is adopted in entrance dispensing outlet conjunction.
Entrance closes and outpours mouth and close and adopt High Temperature High Pressure mining dynamic evaluation instrument and comprise:
Displacement module, for simulate mining site bilayer close adopt actual water pumping gas production time, provide that rock sample is saturated, flowing displacement power;
Rock core self-clamping module, with displacement module, end Fluid Dynamics module, confined pressure and back pressure module, vacuumize module, metering module, temperature control and data acquisition module and be connected, be derived from 3# coal seam for adopting, different permeability simulated by the true rock sample in 15# coal seam, different pressures gradient, different critical resolve pressure, different produce liquid level on bilayer close adopt time water pumping gas production parameter impact, and simulation is under set mining scheme, the situation of change of each zonal pressure gradient, production fluid face, permeability;
End Fluid Dynamics module, is connected with rock core self-clamping module, for simulating in coal-seam gas gas well water pumping gas production process, and the moisture situation of each bottom;
Confined pressure and back pressure module, be connected with rock core self-clamping module, sand face pressure and working fluid level situation of change when confined pressure situation of change and mining site water pumping gas production suffered by reservoir country rock during for simulating mining site water pumping gas production;
Vacuumizing module, be connected with rock core self-clamping module, making for being evacuated by rock core in rock core self-clamping module methane gas fully and the abundant Contact-sorption of rock sample simulate water environment at the bottom of reservoir with stratum water saturation;
Metering module, is connected with rock core self-clamping module, for simulating mining site gas well separate measurement device;
Temperature control and data acquisition module, for simulating the inner actual temperature of reservoir and water production rate rock core self-clamping module import and export pressure, rock core diverse location pressure distribution situation, the different confined pressure pressure of each layering, the different back pressure pressure of each layering, different layering inner fluid speed, pressure gradient distribution, metering system obtained, gas production rate are automatically recorded in time by sensor and data acquisition panel.
As a prioritization scheme of the embodiment of the present invention, entrance closes and outpours mouth and close and adopt High Temperature High Pressure mining dynamic evaluation instrument and be provided with a displacement module, displacement module is formed primarily of methane displacement pump, one-way cock, methane piston container, local water displacement pump, local water piston container, six-way valve, 3# coal seam rock core entrance point pressure transducer, 15# coal seam rock core entrance point pressure transducer, and concrete structure is:
Methane displacement pump connects one-way cock through pipeline, retaining valve connects methane piston container, and methane piston container to be connected with retaining valve after six-way valve and 3# coal seam rock core entrance point pressure transducer, 15# coal seam rock core entrance point pressure transducer through pipeline and to be connected with the import of rock core self-clamping module; Local water displacement pump connects one-way cock through pipeline, and retaining valve connects local water piston container, and local water piston container is connected six-way valve through pipeline with retaining valve and is connected with rock core self-clamping module.
As a prioritization scheme of the embodiment of the present invention, rock core self-clamping module also comprises: 3# coal seam rock sample clamper, 15# coal seam rock sample clamper, steel cylinder, gum cover, Di Shui inlet opening, end water tank, entrance point impurity filter screen, endpiece dust filter unit, rock sample internal monitoring pressure transducer, rock sample.
As a prioritization scheme of the embodiment of the present invention, end Fluid Dynamics module also comprises: water pressure sensor at the bottom of water pressure sensor, 15# coal seam at the bottom of water management six-way valve, 3# coal seam at the bottom of water management six-way valve, 15# coal seam at the bottom of water injection pump, 3# coal seam local water piston container, 15# coal seam local water piston container, 3# coal seam at the bottom of water injection pump, 15# coal seam rock sample at the bottom of the rock sample of 3# coal seam.
As a prioritization scheme of the embodiment of the present invention, confined pressure and back pressure module are referred to as control pressurer system, comprising: 3# coal seam confined pressure pump, 3# coal seam confined pressure retaining valve, 3# coal seam confined pressure pressure transducer, 15# coal seam confined pressure pump, 15# coal seam confined pressure retaining valve, 15# coal seam confined pressure pressure transducer and backpressure pump, back pressure pressure transducer, check valve.
As a prioritization scheme of the embodiment of the present invention, vacuumize module and also comprise: vacuum pump, vacuum valve.
As a prioritization scheme of the embodiment of the present invention, metering module also comprises: bidirectional control valve, rock core top hole pressure monitoring sensor, circular filter core, gas-liquid automatic segregator, automatic gas mass flowmeter, electronic balance.
As a prioritization scheme of the embodiment of the present invention, temperature control and data acquisition module also comprise: temperature control box, data acquisition board, computer system.
Entrance dispensing outlet conjunction is adopted High Temperature High Pressure mining dynamic evaluation instrument and is comprised:
Displacement module, for simulate mining site bilayer close adopt actual water pumping gas production time, provide that rock sample is saturated, flowing displacement power and simulation 3# coal seam, 15# coal seam be at fluid supply capacity;
The outlet of entrance dispensing is closed the High Temperature High Pressure mining dynamic evaluation instrument adopted and is provided with the identical displacement module of two structures, displacement module is formed primarily of methane displacement pump, one-way cock, methane piston container, 3# coal seam local water displacement pump, 3# coal seam local water piston container, 15# coal seam local water displacement pump, 15# coal seam local water piston container, threeway, six-way valve, 3# coal seam rock core entrance point pressure transducer, 15# coal seam rock core entrance point pressure transducer, and concrete structure is:
Methane displacement pump connects one-way cock through pipeline, retaining valve connects methane piston container, and methane piston container to be connected with retaining valve after six-way valve and 3# coal seam rock core entrance point pressure transducer, 15# coal seam rock core entrance point pressure transducer through pipeline and to be connected with 3# coal seam, the rock core self-clamping module import of 15# coal seam respectively; 3# coal seam local water displacement pump connects one-way cock through pipeline, and retaining valve connects 3# coal seam local water piston container, and 3# coal seam local water piston container is connected six-way valve through pipeline with retaining valve and is connected with 3# coal seam rock core self-clamping module entrance point; 15# coal seam local water displacement pump connects one-way cock through pipeline, and retaining valve connects 15# coal seam local water piston container, and 15# coal seam local water piston container is connected with 15# coal seam rock core self-clamping module entrance point after retaining valve connecting tee through pipeline.
Rock core self-clamping module, with displacement model calling, be derived from 3# coal seam for adopting, different permeability simulated by the true rock sample in 15# coal seam, different pressures gradient, different critical resolve pressure, different produce liquid level on bilayer close adopt time water pumping gas production parameter impact, and simulation is under set mining scheme, the situation of change of each zonal pressure gradient, production fluid face, permeability;
End Fluid Dynamics module, is connected with rock core self-clamping module, for simulating in coal-seam gas gas well water pumping gas production process, and the moisture situation of each bottom;
Confined pressure and back pressure module, be connected with rock core self-clamping module, sand face pressure and working fluid level situation of change when confined pressure situation of change and mining site water pumping gas production suffered by reservoir country rock during for simulating mining site water pumping gas production;
Vacuumizing module, be connected with rock core self-clamping module block, making for being evacuated by rock core in rock core self-clamping module methane gas fully and the abundant Contact-sorption of rock sample simulate water environment at the bottom of reservoir with stratum water saturation;
Metering module, is connected with rock core self-clamping module, for simulating mining site gas well separate measurement device;
Temperature control and data acquisition module, for simulating the inner actual temperature of reservoir and water production rate rock core self-clamping module import and export pressure, rock core diverse location pressure distribution situation, the different confined pressure pressure of each layering, the different back pressure pressure of each layering, different layering inner fluid speed, pressure gradient distribution, metering system obtained, gas production rate are automatically recorded in time by sensor and data acquisition panel.
As a prioritization scheme of the embodiment of the present invention, displacement module also comprises: methane displacement pump, one-way cock, methane piston container, 3# coal seam local water displacement pump, 3# coal seam local water piston container, 15# coal seam local water displacement pump, 15# coal seam local water piston container, threeway, six-way valve, 3# coal seam rock core entrance point pressure transducer.
Referring to accompanying drawing, High Temperature High Pressure mining dynamic estimation system is adopted to the conjunction of embodiment of the present invention coalbed methane reservoir bilayer and is described in further detail.
The entrance that Fig. 4 shows the embodiment of the present invention to be provided closes and outpours the structure that High Temperature High Pressure mining dynamic evaluation instrument is adopted in mouth conjunction.
Entrance close outpour mouth close adopt High Temperature High Pressure mining dynamic evaluation instrument primarily of rock core displacement module, rock core self-clamping module, end Fluid Dynamics module, back pressure module and confined pressure module, vacuumize module, metering module, temperature control and data acquisition module seven part composition.
Displacement module is made up of methane displacement pump 1, one-way cock 2, methane piston container 3, local water displacement pump 4, local water piston container 5, six-way valve 6,3# coal seam rock core entrance point pressure transducer 7,15# coal seam rock core entrance point pressure transducer 8, comprise two displacement pumps, four one-way control valves, six-way valve, two piston containers, two entrance point pressure transducer compositions, displacement module is closely connected with rock core self-clamping module, its Main Function is that simulation mining site bilayer closes when adopting actual water pumping gas production, provides that rock sample is saturated, flowing displacement power.The major function of methane displacement pump 1, local water displacement pump 4 is, for methane piston container 3, local water piston container 5 provide power, to control rock core self-clamping module entrance point pressure size by methane displacement pump 1, local water displacement pump 4; Methane piston container 3,5, local water piston container are that simulate formation physical condition fills with methane or local water, and function is that the fluid by the fluid pumped into slowly is pushed away in container by piston enters six-way valve 6 through one-way cock 2; Six-way valve 6 has 6 interfaces, connects 3# coal sample, 15# coal sample respectively, vacuumizes module and one-way cock 2, and effect is the flow direction of the switch decision fluid by different valve; Rock core entrance point pressure monitored by 3# coal seam rock core entrance point pressure transducer 7,15# coal seam rock core entrance point pressure transducer 8; The workflow of displacement module is: fluid controls to enter methane piston container 3 or local water piston container 5 respectively by one-way cock 2 by methane displacement pump 1, local water displacement pump 4 displacement pump, pressure transmission makes piston container steadily can enter rock core self-clamping module entrance point through six-way valve 6 by propelling fluid (methane or local water), and entrance point pressure is monitored respectively by 3# coal seam rock core entrance point pressure transducer 7,15# coal seam rock core entrance point pressure transducer 8;
Rock core self-clamping module is by 3# coal seam rock sample clamper 9, 15# coal seam rock sample clamper 10, steel cylinder 11, gum cover 12, Di Shui inlet opening 13, end water tank 14, entrance point impurity filter screen 15, endpiece dust filter unit 16, rock sample internal monitoring pressure transducer 17, rock sample 18 is formed, its major function is derived from 3# coal seam by adopting, different permeability simulated by the true rock sample in 15# coal seam, different pressures gradient, different critical resolves pressure, different impact of producing water pumping gas production parameter when liquid level is adopted bilayer conjunction, and simulation is under set mining scheme, each zonal pressure gradient, production fluid face, the situation of change of permeability, three Di Shui inlet openings 13 are had bottom each core holding unit, Di Shui inlet opening 13 is water tank 14 at the bottom of above, its function is to ensure that the end water that displacement enters upwards evenly is boosted bottom rock core, Di Shui inlet opening 13, end water tank 14 is by end liquid water content contained by Fluid Dynamics module simulation primitive coalbed inside, the end, be steel cylinder 11 outside 3# coal seam rock sample clamper 9,15# coal seam rock sample clamper 10,80MPa pressure can be born, it is gum cover 12 inside steel cylinder 11, be full of with hydraulic oil between steel cylinder 11 and gum cover 12, the effect of gum cover 12 is to hold rock core and transmission of pressure, when loading confined pressure, pressure makes gum cover distortion make gum cover tightly hold rock sample by hydraulic oil, prevents from loosening in experimentation, rock core entrance point has entrance point impurity filter screen 15, and prevent impurity in local water or methane gas from entering rock core, plugging hole gap structure, affects primary permeability, endpiece has endpiece dust filter unit 16, prevents the bulky grain produced in rock sample in experimentation from entering pipeline and causes pipeline to block, the horizontal side of each rock core self-clamping module is uniform-distribution with four rock sample internal monitoring pressure transducers 17, the inner diverse location pressure gradient change of rock rock sample in monitoring experiment process, rock sample 18 is square rock cores, because coal-seam gas true core is easily broken when cutting, therefore adopting polishing mode that coal petrography is worn into large scale cube, being convenient to monitoring Adsorption and desorption gas content.The workflow of this module is: fluid after six-way valve 6 enters through entrance point impurity filter screen 15, endpiece dust filter unit 16 reaches outlet, in the process by 3# coal seam confined pressure pump 27, 3# coal seam confined pressure retaining valve 28, 3# coal seam confined pressure pressure transducer 29, 15# coal seam confined pressure pump 30, 15# coal seam confined pressure retaining valve 31, 15# coal seam confined pressure pressure transducer 32 adds confined pressure, by backpressure pump 33, back pressure pressure transducer 34, check valve 35, bidirectional control valve 38 controls double-deck back pressure, by water injection pump 19 at the bottom of this 3# coal seam rock sample, water injection pump 20 at the bottom of the rock sample of 15# coal seam, 3# coal seam local water piston container 21, 15# coal seam local water piston container 22, water management six-way valve 23 at the bottom of 3# coal seam, water management six-way valve 24 at the bottom of 15# coal seam, water pressure sensor 25 at the bottom of 3# coal seam, at the bottom of 15# coal seam, water pressure sensor 26 is simulated, control liquid water content at the bottom of each reservoir rock sample, by being distributed in 3# coal seam, the change of two rock sample different parts pressure gradients monitored by eight monitoring pressure sensors 17 of side, 15# coal seam, the change of permeability,
End Fluid Dynamics module is made up of water pressure sensor 26 at the bottom of water pressure sensor 25,15# coal seam at the bottom of water management six-way valve 24,3# coal seam at the bottom of water management six-way valve 23,15# coal seam at the bottom of water injection pump 20,3# coal seam local water piston container 21,15# coal seam local water piston container 22,3# coal seam at the bottom of water injection pump 19,15# coal seam rock sample at the bottom of the rock sample of 3# coal seam, its function is in simulation coal-seam gas gas well water pumping gas production process, the moisture situation of coal seam double bottom.Water injection pump 20 at the bottom of water injection pump 19,15# coal seam rock sample at the bottom of the rock sample of 3# coal seam is 3# coal seam local water piston container 21,15# coal seam local water piston container 22 provides driving pressure, by the bottom of the rock sample of 3# coal seam at the bottom of water injection pump 19,15# coal seam rock sample water injection pump 20 control enter rock core self-clamping module Di Shui inlet opening 13 water yield number; 3# coal seam local water piston container 21,22,15# coal seam local water piston container fill with 3# coal seam, the true bottom water sample in 15# coal seam respectively; At the bottom of 3# coal seam, at the bottom of water management six-way valve 23,15# coal seam, water management six-way valve 24 has 6 interfaces, connect water pressure sensor 26 and 3# coal seam local water piston container 21,15# coal seam local water piston container 22 at the bottom of 3# coal sample three Di Shui inlet openings 13,15# coal sample three Di Shui inlet openings 13, pressure transducer 25,15# coal seam respectively, effect is the whereabouts of the switch control rule fluid by different valve; End Fluid Dynamics module work flow process is: bottom 3# coal sample, 15# coal sample water cut size by water injection pump 20 at the bottom of water injection pump 19,15# coal seam rock sample at the bottom of the rock sample of 3# coal seam through 3# coal seam local water piston container 21,15# coal seam local water piston container 22 by six-way valve 6 control flow check to slowly enter bottom six Di Shui inlet openings 13, then assemble in end water tank 14, evenly advance to rock core top under the pressure effect that at the bottom of water injection pump 19,15# coal seam rock sample, water injection pump 20 provides at the bottom of the rock sample of 3# coal seam;
Confined pressure and back pressure module are referred to as control pressurer system, have by 3# coal seam confined pressure pump 27 respectively, 3# coal seam confined pressure retaining valve 28, 3# coal seam confined pressure pressure transducer 29, 15# coal seam confined pressure pump 30, 15# coal seam confined pressure retaining valve 31, 15# coal seam confined pressure pressure transducer 32 and backpressure pump 33, back pressure pressure transducer 34, check valve 35 forms, confined pressure situation of change suffered by reservoir country rock during the mining site water pumping gas production of confined pressure module simulation, and confined pressure situation suffered by country rock determines rock mesoporosity structural deformation conditions, affects fluid adsorption, desorb, diffusion, percolation ability, with aerogenesis, produce water, producing coal powder is in close relations, sand face pressure and working fluid level situation of change during the mining site water pumping gas production of back pressure module simulation, sand face pressure size during back pressure module simulation gas well liquid loading, and the size of sand face pressure determines absorption, resolve, the speed of diffusion and aerogenesis, produce water, producing coal powder number, by control sand face pressure also can simulate water pumping gas production time, in gas well, the change of working fluid level is on the impact of water pumping gas production.3# coal seam confined pressure pump 27 in confined pressure module, 15# coal seam confined pressure pump 30 is 3# coal seam, 15# coal seam provides confined pressure, 3# coal seam confined pressure retaining valve 28, the switch control rule 3# coal seam confined pressure pump 27 of 15# coal seam confined pressure retaining valve 31, the confined pressure pump 30 hydrodynamic pressure transmission of 15# coal seam, 3# coal seam confined pressure pressure transducer 29, the numerical value of 15# coal seam confined pressure pressure transducer 32 Real-Time Monitoring confined pressures, its workflow is: 3# coal seam confined pressure pump 27, 15# coal seam confined pressure pump 30 by the hydrodynamic pressure that pumps into by 3# coal seam confined pressure retaining valve 28, 15# coal seam confined pressure retaining valve 31 is passed to the steel cylinder 11 of rock core self-clamping module, make gum cover be out of shape between gum cover 12 and produce confined pressure, and then stress situation suffered by simulation coal petrography, in back pressure module, backpressure pump 33 provides the size of back pressure, check valve 35 Main Function is when back pressure reaches setting size, valve is opened automatically, backpressure pump 33 quits work, the fluid that 3# coal seam rock sample clamper 9, rock sample clamper 10 displacement of 15# coal seam go out enters metering module, when being less than the back pressure numerical value of setting, valve closes automatically, backpressure pump 33 stops after starting working and back pressure being loaded on setting numerical value automatically, now in fluid 9,10 produce fluid and do not enter metering system, the size of back pressure is by back pressure pressure transducer 34 instantaneous measurement.Its workflow is: check valve 35 controls the pressure size that backpressure pump 33 produces, and the generation of numerical value then has back pressure pressure transducer 34 record;
Vacuumize module, Main Function is evacuated by rock core in rock core self-clamping module to make methane gas fully and the abundant Contact-sorption of rock sample simulate reservoir water environment with stratum water saturation, and this module is made up of vacuum pump 36, vacuum valve 37.Its workflow is: after equipment inspection, by whole experimental provision so device is closed, rock sample is put into rock core self-clamping module and after confined pressure module adds confined pressure simultaneously, open six-way valve 6, 3# coal seam rock core entrance point pressure transducer 7, vacuum pump 36, rock sample is vacuumized 24 hours by vacuum valve 37, then vacuum pump 36 is closed, vacuum valve 37 opens methane displacement pump 1, one-way cock 2, methane piston container 3, six-way valve 6 makes methane gas enter rock sample fully to adsorb 48 hours, then close methane displacement pump 1, one-way cock 2, methane piston container 3, six-way valve 6, open water injection pump 19 at the bottom of the rock sample of 3# coal seam, water injection pump 20 at the bottom of the rock sample of 15# coal seam, 3# coal seam local water piston container 21, 15# coal seam local water piston container 22, water management six-way valve 23 at the bottom of 3# coal seam, water management six-way valve 24 at the bottom of 15# coal seam makes end water enter fully saturated 48 hours, then close,
Metering module, be made up of bidirectional control valve 38, rock core top hole pressure monitoring sensor 39, circular filter core 40, gas-liquid automatic segregator 41, automatic gas mass flowmeter 42, electronic balance 43, its function is the gas, liquid, solid three-phase fluid produced from 3# coal seam rock sample clamper 9,15# coal seam rock sample clamper 10 module to be progressively separated by specific mode, and the output of automatic gauge gas, liquid, this module main analog mining site gas well separate measurement device.Fluid is after rock core endpiece flows out, coal dust may be comprised, the effect of circular filter core 40 is coal dust to propose to stay in filtration core, gas-liquid automatic segregator 41 is gas-liquid separator, the gas mixed can be separated automatically with liquid, liquid after separation is by electronic balance 43 automatic gauge, and gas is then by automatic gas mass flowmeter 42 automatic gauge.Its workflow is: gas, liquid, solid fluid-mixing is after the outlet of rock core self-clamping module is flowed out, first by coal dust dust collection that circular coal collector will produce in rock core, then gas-liquid two-phase is separated into liquid and gas automatically by gas-liquid separator, gas phase is measured by automatic gas mass flowmeter 42, and liquid quality is monitored by electronic balance 43.
Temperature control and data acquisition module, by temperature control box 44, data acquisition board 45, computer system 46 is formed, major function is the inner actual temperature of simulation reservoir and rock core self-clamping module is entered, top hole pressure, rock core diverse location pressure distribution situation, the different confined pressure pressure of each layering, the different back pressure pressure of each layering, different layering inner fluid speed, pressure gradient distributes, the water production rate that metering system obtains, gas production rate is automatically recorded in time by sensor and data acquisition panel, for usage data analysis software process data lay the first stone, there is accurate measurement, automaticity advantages of higher.
The structure of adopting High Temperature High Pressure mining dynamic evaluation instrument is closed in the entrance dispensing outlet that Fig. 5 shows the embodiment of the present invention to be provided.
Entrance dispensing outlet conjunction adopt High Temperature High Pressure mining dynamic evaluation instrument by rock core displacement module, rock core self-clamping module, end Fluid Dynamics module, confined pressure module and back pressure module, vacuumize module, metering module, temperature control and data acquisition module seven part and form.
Close with entrance and outpour mouth and close and adopt compared with High Temperature High Pressure mining dynamic evaluation instrument structure, only have rock core displacement module to there occurs change, and all the other modular structures are identical, therefore only introduce the formation of rock core displacement module, function and workflow below.
Displacement module is by methane displacement pump 1, one-way cock 2, methane piston container 3, 3# coal seam local water displacement pump 4, 3# coal seam local water piston container 5, 15# coal seam local water displacement pump 6, 15# coal seam local water piston container 7, threeway 8, six-way valve 9, 3# coal seam rock core entrance point pressure transducer 10, 15# coal seam rock core entrance point pressure transducer 11 forms, comprise three platform displacement pumps, five one-way control valves, a six-way valve, a T-valve, three piston containers, two entrance point pressure transducer compositions, displacement module and rock core self-clamping module close proximity, when its Main Function is that actual water pumping gas production is adopted in the conjunction of simulation mining site bilayer, there is provided rock sample saturated, flowing displacement power and simulation 3# coal seam, the fluid supply capacity that 15# coal seam is different, each layering fluid supply capacity is different, pressure gradient in reservoir, rate of flow of fluid, gas production rate is different.The major function of methane displacement pump 1,3# coal seam local water displacement pump 4,15# coal seam local water displacement pump 6 is, for methane piston container 3,3# coal seam local water piston container 5,15# coal seam local water piston container 7 provide power, to control rock core self-clamping module entrance point pressure size by methane displacement pump 1,3# coal seam local water displacement pump 4,15# coal seam local water displacement pump 6, methane piston container 3,3# coal seam local water piston container 5,7,15# coal seam local water piston container are that simulate formation physical condition fills with methane or local water, and function is that the fluid by the fluid pumped into slowly is pushed away in container by piston enters 3# coal seam and 15# coal seam core holding unit 12 or 13 entrance point through one-way cock 2, six-way valve 9 has 6 interfaces, connect 3# coal sample, 15# coal sample respectively, vacuumize module and one-way cock 2, effect is the flow direction of the switch decision fluid by different valve, threeway 8 has three interfaces, be communicated with six-way valve 9,15# coal seam piston container and 15# coal seam core holding unit respectively, control the flow direction of fluid, rock core entrance point pressure in the same time monitored not by 3# coal seam rock core entrance point pressure transducer 10,15# coal seam rock core entrance point pressure transducer 11, the workflow of displacement module is: fluid is by methane displacement pump 1, 3# coal seam local water displacement pump 4, 15# coal seam local water displacement pump 6 displacement pump controls to enter methane piston container 3 respectively by one-way cock 2, 3# coal seam local water piston container 5, 15# coal seam local water piston container 7, pressure transmission makes piston container steadily can enter two rock core self-clamping module entrance points through six-way valve 9 or threeway 8 by propelling fluid (methane or local water), entrance point pressure is by 3# coal seam rock core entrance point pressure transducer 10, 15# coal seam rock core entrance point pressure transducer 11 is Real-Time Monitoring respectively, when it is characterized in that adopting by 15# coal seam local water displacement pump 6,15# coal seam local water piston container 7, one-way cock 2, threeway 8 or 3# coal seam local water displacement pump 4,3# coal seam local water piston container 5, one-way cock 2, six-way valve 9, threeway 8 Simulation evaluation 3# coal seam, the different two-layer outlet conjunction of 15# coal seam fluid supply capacity, 3# coal seam, 15# coal seam rock sample permeability, aerogenesis liquid level, desorption pressures, reservoir pressure gradient and water pumping gas production Relationship between Parameters, optimize double-deck conjunction and adopt mining scheme, improve recovery ratio.
Below in conjunction with the concrete using method of embodiments of the invention the entrance in the present invention closed and outpour mouth and close the technical scheme of adopting High Temperature High Pressure mining dynamic evaluation instrument and be described in more detail.
1. raw coal rock preparation
The coal cinder got up from down-hole takes back laboratory after the sealing wax of ground, to remain a constant speed slowly cutting along drilling through direction perpendicular to coal sample with coal sample cutting machine, constant to ensure the former layer position physical parameter in coal sample, then the coal sample of cutting is slowly worn into experiment specification coal sample on sander;
2. equipment inspection
The steel rock sample of standard is put into core holding unit, and is opened by seven modular systems, run 1 ~ 2 hour, whether the check and correction of the sealing of checkout equipment all parts, ruuning situation and sensor is correct;
3. opening temp. control and data acquisition module
Opening temp. control case 44, data acquisition board 45, computer system 46, be heated to coal-seam gas formation temperature by temperature control box 44, and keep temperature-resistant in experimentation.Various kinds of sensors one direct-open, guarantees the data each position being detected in time;
4. vacuumize, adsorb, simulate end water
1. guarantee that whole equipment can after true(-)running, by the Qinshui basin 3# coal seam of having polished, 3# coal seam rock sample clamper 9 put into by 15# coal seam rock sample, in 15# coal seam rock sample clamper 10, then closing one-way valve door 2, bidirectional control valve 38, open the valve flowing to two core holding units in six-way valve 6, open vacuum valve 37, open vacuum pump 36, vacuum valve 37 is closed after vacuumizing 24 hours, vacuum pump 36, six-way valve 6, then methane displacement pump 1 is opened, and the one-way cock 2 opened on this circuit, with 3# coal seam rock sample clamper 9 in six-way valve 6, the valve that 15# coal seam rock sample clamper 10 is connected, methane is extremely slowly injected 3# coal seam rock sample clamper 9 by methane displacement pump 1, in 15# coal seam rock sample clamper 10, injection length is 48 hours, pressure must slowly promote methane piston container 3 and slowly enter 3# coal seam rock sample clamper 9, 15# coal seam rock sample clamper 10, in the process by the 3# coal seam rock core entrance point pressure transducer 7 in two cover core holding units, 15# coal seam rock core entrance point pressure transducer 8, rock sample internal monitoring pressure transducer 17, data acquisition board 45,3# coal seam confined pressure pressure transducer 29,15# coal seam confined pressure pressure transducer 32 are all opened, timely monitoring also records the change of confined pressure in rock core, stream pressure, then closes the methane displacement pump 1, the one-way cock 2 that are connected with methane piston container 3,
2. will with water injection pump 19 at the bottom of the rock sample of 3# coal seam, 3# coal seam local water piston container 21, water injection pump 20 at the bottom of water management six-way valve 23 pipeline at the bottom of 3# coal seam and 15# coal seam rock sample, 15# coal seam local water piston container 22, at the bottom of 15# coal seam, water management six-way valve 24 pipeline is opened, two coal seam local waters are slowly injected again with extremely low speed, until when pressure in core holding unit is identical with coalbed methane reservoir original pressure, stop injecting, close water injection pump 19 at the bottom of the rock sample of 3# coal seam, 3# coal seam local water piston container 21, water injection pump 20 at the bottom of water management six-way valve 23 pipeline at the bottom of 3# coal seam and 15# coal seam rock sample, 15# coal seam local water piston container 22, water management six-way valve 24 at the bottom of 15# coal seam,
5. open confined pressure module
When rock core confined pressure is risen to formation production with 15# coal seam confined pressure pump 30,15# coal seam confined pressure retaining valve 31 by unlatching 3# coal seam confined pressure pump 27,3# coal seam confined pressure retaining valve 28 respectively, confined pressure size suffered by 3# coal seam, 15# coal seam coal petrography reality, then stops;
6. open back pressure module
Open 3# coal seam rock sample clamper 9, the backpressure pump 33 of 15# coal seam rock sample clamper 10, back pressure pressure transducer 34, check valve 35, by controlling back pressure pressure size, simulating actual mining site sand face pressure, simulation mining site dynamic liquid level height, simulation reservoir pressure reduction difference closes the impact of adopting on bilayer;
7. open metering module
Open bidirectional control valve 38, gas-liquid automatic segregator 41, automatic gas mass flowmeter 42, electronic balance 43, by from the fluid-mixing of outlet port of rock core holder fluid by the metering of different isolation of components, and the moment pay close attention to pressure transducer record the change of numerical value;
8. different schemes combination evaluation bilayer closes and adopts water pumping gas production
Open displacement module, end Fluid Dynamics module or back pressure module according to different experiment purposes and regulate back pressure force value size, when evaluating reservoir permeability change respectively, dynamic liquid level height change time, each zonal pressure gradient different time, fluid supply capacity closes the impact of adopting water pumping gas production effect to bilayer time identical or different;
9. experiment terminates; 10. measure coal dust amount; 11. data analyses; 12 write laboratory report.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. a coalbed methane reservoir bilayer closes and adopts High Temperature High Pressure mining dynamic estimation system, it is characterized in that, described coalbed methane reservoir bilayer closes to be adopted High Temperature High Pressure mining dynamic estimation system and comprises closing for coal-seam gas entrance and outpour mouth and closes the High Temperature High Pressure mining dynamic evaluation instrument that the High Temperature High Pressure mining dynamic evaluation instrument adopted and entrance dispensing outlet conjunction adopt;
Described entrance closes and outpours mouth and close and adopt High Temperature High Pressure mining dynamic evaluation instrument and the outlet of entrance dispensing and close the High Temperature High Pressure mining dynamic evaluation instrument adopted and comprise respectively:
Displacement module, for simulate mining site bilayer close adopt actual water pumping gas production time, provide that rock sample is saturated, the different fluid supply capacity of flowing displacement power and simulation 3# coal seam, 15# coal seam;
Rock core self-clamping module, with described displacement model calling, be derived from 3# coal seam for adopting, different permeability simulated by the true rock sample in 15# coal seam, different pressures gradient, different critical resolve pressure, different produce liquid level on bilayer close adopt time water pumping gas production parameter impact, and simulation is under set mining scheme, the situation of change of each zonal pressure gradient, production fluid face, permeability;
End Fluid Dynamics module, is connected with described rock core self-clamping module, for simulating in coal-seam gas gas well water pumping gas production process, and the moisture situation of each bottom;
Confined pressure and back pressure module, be connected with described rock core self-clamping module, sand face pressure and working fluid level situation of change when confined pressure change and mining site water pumping gas production suffered by reservoir country rock during for simulating mining site water pumping gas production;
Vacuumizing module, be connected with described rock core self-clamping module, making for being evacuated by rock core in rock core self-clamping module methane gas fully and the abundant Contact-sorption of rock sample simulate water environment at the bottom of reservoir with stratum water saturation;
Metering module, is connected with described rock core self-clamping module, for simulating mining site gas well separate measurement device;
Temperature control and data acquisition module, for simulating the inner actual temperature of reservoir and water production rate rock core self-clamping module import and export pressure, rock core diverse location pressure distribution situation, the different confined pressure pressure of each layering, the different back pressure pressure of each layering, different layering inner fluid speed, pressure gradient distribution, metering system obtained, gas production rate are automatically recorded in time by sensor and data acquisition panel.
2. coalbed methane reservoir bilayer as claimed in claim 1 closes and adopts High Temperature High Pressure mining dynamic estimation system, it is characterized in that, described entrance closes and outpours mouth and close and adopt High Temperature High Pressure mining dynamic evaluation instrument and be provided with a displacement module, described displacement module is formed primarily of methane displacement pump, one-way cock, methane piston container, local water displacement pump, local water piston container, six-way valve, 3# coal seam rock core entrance point pressure transducer, 15# coal seam rock core entrance point pressure transducer, and concrete structure is:
Methane displacement pump connects one-way cock through pipeline, one-way cock connects methane piston container, and methane piston container to be connected with one-way cock after six-way valve and 3# coal seam rock core entrance point pressure transducer, 15# coal seam rock core entrance point pressure transducer through pipeline and to be connected with the import of rock core self-clamping module; Local water displacement pump connects one-way cock through pipeline, and one-way cock connects local water piston container, and local water piston container is connected six-way valve through pipeline with one-way cock and is connected with rock core self-clamping module.
3. coalbed methane reservoir bilayer as claimed in claim 1 closes and adopts High Temperature High Pressure mining dynamic estimation system, it is characterized in that, described entrance dispensing outlet is closed the High Temperature High Pressure mining dynamic evaluation instrument adopted and is provided with the identical displacement module of two structures, described displacement module is primarily of methane displacement pump, one-way cock, methane piston container, 3# coal seam local water displacement pump, 3# coal seam local water piston container, 15# coal seam local water displacement pump, 15# coal seam local water piston container, T-valve, six-way valve, 3# coal seam rock core entrance point pressure transducer, 15# coal seam rock core entrance point pressure transducer is formed, concrete structure is:
Methane displacement pump connects one-way cock through pipeline, one-way cock connects methane piston container, and methane piston container to be connected with one-way cock after six-way valve and 3# coal seam rock core entrance point pressure transducer, 15# coal seam rock core entrance point pressure transducer through pipeline and to be connected with 3# coal seam, the rock core self-clamping module import of 15# coal seam respectively; 3# coal seam local water displacement pump connects one-way cock through pipeline, and one-way cock connects 3# coal seam local water piston container, and 3# coal seam local water piston container is connected six-way valve through pipeline with one-way cock and is connected with 3# coal seam rock core self-clamping module entrance point; 15# coal seam local water displacement pump connects one-way cock through pipeline, and one-way cock connects 15# coal seam local water piston container, and 15# coal seam local water piston container is connected with 15# coal seam rock core self-clamping module entrance point after one-way cock connecting tee valve through pipeline.
4. coalbed methane reservoir bilayer as claimed in claim 1 closes and adopts High Temperature High Pressure mining dynamic estimation system, it is characterized in that, described rock core self-clamping module also comprises: 3# coal seam core holding unit, 15# coal seam core holding unit, steel cylinder, gum cover, Di Shui inlet opening, end water tank, entrance point impurity filter screen, endpiece dust filter unit, rock sample internal monitoring pressure transducer;
Two core holding unit structures are identical, are core chamber in the middle of clamper, water tank at the bottom of core chamber's lower end connection, water hole at the bottom of one is arranged at water tank bottom, the end, water hole, end rubber connecting sleeve, and whole core chamber wraps up by gum cover, gum cover outside is steel cylinder, is full of hydraulic oil between steel cylinder and gum cover; Core chamber front end connects entrance point impurity filter screen, rear end connection outlet end dust filter unit; Core chamber's intermediate distribution rock sample internal pressure sensor.
5. coalbed methane reservoir bilayer as claimed in claim 1 closes and adopts High Temperature High Pressure mining dynamic estimation system, it is characterized in that, Fluid Dynamics module of the described end also comprises: water pressure sensor at the bottom of water pressure sensor, 15# coal seam at the bottom of water management six-way valve, 3# coal seam at the bottom of water management six-way valve, 15# coal seam at the bottom of water injection pump, 3# coal seam local water piston container, 15# coal seam local water piston container, 3# coal seam at the bottom of water injection pump, 15# coal seam rock sample at the bottom of the rock sample of 3# coal seam;
Water injection pump at the bottom of the rock sample of 3# coal seam connects 3# coal seam local water piston container through pipeline, 3# coal seam local water piston container connects water management six-way valve at the bottom of 3# coal seam, and at the bottom of three Di Shui inlet openings of water management six-way valve at the bottom of 3# coal seam and 3# coal seam core holding unit, 3# coal seam, water pressure sensor is connected; Water injection pump at the bottom of the rock sample of 15# coal seam connects 15# coal seam local water piston container through pipeline, 15# coal seam local water piston container connects water management six-way valve at the bottom of 15# coal seam, and at the bottom of three Di Shui inlet openings of water management six-way valve at the bottom of 15# coal seam and 15# coal seam core holding unit, 15# coal seam, water pressure sensor is connected.
6. coalbed methane reservoir bilayer as claimed in claim 1 closes and adopts High Temperature High Pressure mining dynamic estimation system, it is characterized in that, described confined pressure and back pressure module are referred to as control pressurer system, comprising: 3# coal seam confined pressure pump, 3# coal seam confined pressure one-way cock, 3# coal seam confined pressure pressure transducer, 15# coal seam confined pressure pump, 15# coal seam confined pressure one-way cock, 15# coal seam confined pressure pressure transducer and backpressure pump, back pressure pressure transducer, check valve;
3# coal seam confined pressure pump connects 3# coal seam confined pressure one-way cock, and 3# coal seam one-way cock is connected with 3# coal seam core holding unit confined pressure entrance point after connecting 3# coal seam confined pressure pressure transducer; 15# coal seam confined pressure pump connects 15# coal seam confined pressure one-way cock, and 15# coal seam one-way cock is connected with 15# coal seam core holding unit confined pressure entrance point after connecting 15# coal seam confined pressure pressure transducer; Return 3 press pumps and connect check valve through back pressure pressure transducer, check valve is connected with rock core self-clamping module endpiece.
7. coalbed methane reservoir bilayer as claimed in claim 1 closes and adopts High Temperature High Pressure mining dynamic estimation system, it is characterized in that, described in vacuumize module and also comprise: vacuum pump, vacuum valve;
Vacuum pump connects vacuum valve, and vacuum valve is connected with 3# coal seam rock core self-clamping module, 15# coal seam rock core self-clamping module after six-way valve.
8. coalbed methane reservoir bilayer as claimed in claim 1 closes and adopts High Temperature High Pressure mining dynamic estimation system, it is characterized in that, described metering module also comprises: bidirectional control valve, rock core top hole pressure monitoring sensor, circular filter core, gas-liquid automatic segregator, automatic gas mass flowmeter, electronic balance;
Bidirectional control valve is connected with circular filter core, circular filter core is connected with gas-liquid automatic segregator after check valve, gas-liquid automatic segregator is connected with electronic balance, automatic gas mass flowmeter, electronic balance is arranged at the bottom of gas-liquid separator, and automatic gas mass flowmeter is arranged at the left side of gas-liquid automatic segregator.
9. coalbed methane reservoir bilayer as claimed in claim 1 closes and adopts High Temperature High Pressure mining dynamic estimation system, it is characterized in that, described displacement module, rock core self-clamping module, end Fluid Dynamics module installation are in temperature control box inside;
Described temperature control and data acquisition module comprise 16 pressure transducers, data acquisition board, computer systems; Data acquisition board is positioned at temperature control box outside, connects computer system; Three pressure transducers are distributed in rock core self-clamping module import and export end, eight are arranged at rock core self-clamping module inside, a pressure transducer is arranged in the back pressure module of confined pressure and back pressure module, two are arranged in the confined pressure module of confined pressure and back pressure module, and two are arranged in end Fluid Dynamics module.
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| CN110672490B (en) * | 2019-10-14 | 2022-03-25 | 辽宁工程技术大学 | Coal bed gas multilayer commingled production experimental device and method for simulating bottom hole pressure |
| CN112780235B (en) * | 2019-11-01 | 2023-01-10 | 中国石油天然气股份有限公司 | Drainage and production control method, device, control equipment and storage medium for coal-bed gas well |
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| CN111155981B (en) * | 2019-12-20 | 2023-05-09 | 中煤科工集团西安研究院有限公司 | Method for monitoring gas production of double-coal laminated layer drainage and production layers of coal-bed gas well |
| CN112049610B (en) * | 2020-10-21 | 2023-09-08 | 河南理工大学 | Device and method for testing dynamic change of parameters of various coal beds during seam gas well seam production |
| CN114718512B (en) * | 2021-01-05 | 2023-08-22 | 中国石油天然气股份有限公司 | Coalbed methane depressurization drainage simulation experiment device and method |
| CN112924354B (en) * | 2021-01-22 | 2022-09-20 | 西南石油大学 | Shale reservoir stress sensitivity experiment evaluation method based on gas diffusion coefficient |
| CN114177733B (en) * | 2021-12-01 | 2023-06-09 | 武汉工程大学 | System for separating coal and water for coal bed gas drainage and gas production and purifying water and control method |
| CN114441407A (en) * | 2022-01-14 | 2022-05-06 | 合肥综合性国家科学中心能源研究院(安徽省能源实验室) | Hypotonic coal rock CO2Dynamic visual simulation test system and method for displacement process |
| CN114542019B (en) * | 2022-04-07 | 2022-11-25 | 中国地质大学（北京） | Unconventional reservoir fluid adsorption migration displacement simulation measuring device |
| CN115095320A (en) * | 2022-07-06 | 2022-09-23 | 西南石油大学 | Experimental device for simulating high-low pressure double-layer combined mining of gas reservoir |
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| US6681855B2 (en) * | 2001-10-19 | 2004-01-27 | Cdx Gas, L.L.C. | Method and system for management of by-products from subterranean zones |
| EP2691603A4 (en) * | 2011-03-31 | 2016-04-27 | Univ Wyoming | Biomass-enhanced natural gas from coal formations |
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| CN102374963A (en) * | 2010-08-27 | 2012-03-14 | 中国石油大学(北京) | Test device for evaluating well completion manner of coal bed methane |
| CN102323394A (en) * | 2011-08-23 | 2012-01-18 | 中国地质大学（武汉） | Experimental apparatus and method for researching response characteristic of natural gas hydrate stratum to drilling fluid intrusion |
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