CN103256045B - The generation of coalbed methane reservoir coal dust, migration, sedimentation, blocking dynamic evaluation instrument - Google Patents

The generation of coalbed methane reservoir coal dust, migration, sedimentation, blocking dynamic evaluation instrument Download PDF

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CN103256045B
CN103256045B CN201310055324.0A CN201310055324A CN103256045B CN 103256045 B CN103256045 B CN 103256045B CN 201310055324 A CN201310055324 A CN 201310055324A CN 103256045 B CN103256045 B CN 103256045B
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module
pressure
rock core
visual
water
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CN201310055324.0A
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CN103256045A (en
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彭小龙
王铭伟
杜志敏
王可可
孙晗森
张平
吴翔
莫非
张燕
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西南石油大学
中联煤层气有限责任公司
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Abstract

The invention discloses the generation of a kind of coalbed methane reservoir coal dust, migration, sedimentation, blocking dynamic evaluation instrument, comprise rock core displacement module, vacuumize module, visual rock core self-clamping module, end Fluid Dynamics module, confined pressure module, back pressure module, metering module, micro-digital image sub-module, temperature control and data acquisition module; Observe, evaluate the experimental facilities of the characteristics of motion such as the generation of coalbed methane reservoir coal dust, migration, sedimentation, blocking under the nearly well condition of this dynamic evaluation instrument simulation mining site, can be used for analyzing, observing coal bed gas well coal dust source, coal dust migration pathway, the sedimentation of quantitative assessment coal dust, block impact on reservoir permeability and production, and the relation of establishing between water pumping gas production parameter and output coal dust, for reducing coal dust output, reduce equipment attrition rate, optimizing mining system provides experiment basis; The characteristics of motion of coal dust in rock core can be observed, explore the optimum mining system under coal dust migration condition, obtain maximum resource utilization rate.

Description

The generation of coalbed methane reservoir coal dust, migration, sedimentation, blocking dynamic evaluation instrument
Technical field
The invention belongs to cbm exploration and production industry, particularly relate to the generation of a kind of coalbed methane reservoir coal dust, migration, sedimentation, blocking dynamic evaluation instrument.
Background technology
Current coal bed gas well adopts art technique, fracturing renovation technique and multicomponent gas displacement technology to improve Single Gas Well output mostly.But China's major part coal geology complex structure, deformation coal is grown, ature of coal have more crisp, cementing properties is poor, the frangible and feature such as easily to cave in, and there is serious output coal dust phenomenon in recovery process.The migration of coal dust in coal seam sedimentation can block seepage channel, coal bed gas well decline rate is accelerated, even stops production; Coal dust migration is piled up to pit shaft or in shaft bottom, or enter mining pipeline, finally cause holddown, bury the generation of the phenomenons such as pump, have a strong impact on cbm development process, reduce coal-bed gas exploitation benefit, therefore conservative control and management coal dust output have become the key of coal bed gas well stable high yield.
In the research of coal bed gas well output coal dust: first, the source of Chinese scholars to coal dust there is much controversy.Some scholars thinks that coal dust derives from the landwaste that produces in drilling process and drill bit creeps into the destruction of causing country rock; Some scholars thinks that coal dust self composes by the effect of tectonic geology power in reservoir forming process to exist in reservoir; The scholar also had thinks that coal dust is formed due to well stimulation (fracturing) destruction to rock, and therefore, coal dust source there is much controversy; Secondly, coal dust migration pathway, position it be unclear that.Coal dust can, in whole reservoir inside migration, as long as the place that Pressure Drop fluctuates, can make coal dust migrate to have scholar to think; Coal dust migration only can be migrated in crack to have scholar to think, and is only present near wellbore zone; Its three, for coal dust migration influence factor, do not do both at home and abroad and tested research; Its four, be how sedimentation and blocking in coal dust motion process? anything is caused to affect on production after sedimentation, blocking? Chinese scholars did not also do research.
Observe, evaluate the experimental facilities of the characteristics of motion such as the generation of coalbed methane reservoir coal dust, migration, sedimentation, blocking under lacking the nearly well condition of a set of special simulation mining site at present both at home and abroad, can be used for analyzing, observing coal bed gas well coal dust source, coal dust migration pathway, the sedimentation of quantitative assessment coal dust, block impact on reservoir permeability and production, and the relation of establishing between water pumping gas production parameter and output coal dust, for reducing coal dust output, reduce equipment attrition rate, optimizing mining system provides experiment basis.
This equipment can migrate on the source of coal dust, the factor affecting coal dust migration, the relation between coal dust and mining system, coal dust passage, coal dust motion every trade is when affecting factor and consequence, single-phase, two-phase seepage flow that coal dust moves, relation between the gentle well production of output coal dust makes quantitative assessment, the characteristics of motion of coal dust in rock core can be observed, the optimum mining system under coal dust migration condition can be explored, obtain maximum resource utilization rate.
Summary of the invention
The object of the invention is to utilize the generation of a kind of coalbed methane reservoir coal dust, migration, sedimentation, blocking dynamic evaluation instrument, be intended to solve under lacking the nearly well condition of a set of special simulation mining site at present both at home and abroad the problem of observing, evaluating the characteristics of motion experimental facilities such as the generation of coalbed methane reservoir coal dust, migration, sedimentation, blocking.
The object of the present invention is to provide the generation of a kind of coalbed methane reservoir coal dust, migration, sedimentation, blocking dynamic evaluation instrument, described dynamic evaluation instrument comprises:
Rock core displacement module, for simulating, mining site water pumping gas production is single-phase, Two-phase flow time displacement power is provided;
Vacuumize module, being connected with described rock core displacement module, visual rock core self-clamping module, making for being evacuated by rock sample in visual rock core self-clamping module methane gas fully and the abundant Contact-sorption of rock sample use coal seam formation water saturation simulation reservoir water environment;
Visual rock core self-clamping module, with described rock core displacement module, metering module, confined pressure module, back pressure module, vacuumize module, end Fluid Dynamics module, micro-digital image module, metering module be connected, for by adopting the true rock sample being derived from coal seam to simulate the generation of coal dust under different permeability, different pore structures, migration, sedimentation, blocking behavior and rock core internal pressure gradient, resolve relation between pressure, producing pressure differential, flow velocity;
End Fluid Dynamics module, is connected with described visual rock core self-clamping module, for simulating in coal bed gas gas well water pumping gas production process, and moisture situation bottom the reservoir of coal seam;
Confined pressure analog module, be connected with described visual rock core self-clamping module, confined pressure situation of change suffered by reservoir country rock during for simulating mining site water pumping gas production, confined pressure situation suffered by country rock determines rock mesopore structural deformation conditions, pore structure distortion with coal seam aerogenesis, produces water, producing coal powder is in close relations, stream press and confined pressure jointly determine coal dust transport conditions;
Back pressure module, be connected with described visual rock core self-clamping module, flowing bottomhole pressure (FBHP) and producing fluid level situation of change when back pressure module and rock core displacement module simulate mining site water pumping gas production jointly, flowing bottomhole pressure (FBHP) size during back pressure module simulation gas well liquid loading, the size of flowing bottomhole pressure (FBHP) and aerogenesis, produce water, producing coal powder is in close relations, when also can simulate water pumping gas production by controlling flowing bottomhole pressure (FBHP) in gas well the change of producing fluid level on the impact of water pumping gas production;
Metering module, be connected with described visual rock core self-clamping module, for the gas, liquid, solid three-phase fluid produced from visual rock core self-clamping module is progressively separated by specific mode, and the output of automatic gauge gas, liquid, main analog mining site gas well separate measurement device;
Micro-digital image sub-module, is connected with described visual rock core self-clamping module, and for taking rock sample surface picture or recording a video to coal dust migration behavior, record coal dust produces position, migration pathway and migration consequence;
Temperature control and data acquisition module, for by automatically recording in time by sensor and data acquisition panel the inner actual temperature of the regulation and control of device temperature simulation reservoir and aquifer yield, gas production for visual rock core self-clamping module inlet and outlet pressure, rock core diverse location pressure distribution situation, different confined pressure pressure, different back pressure pressure, different layering inner fluid speed, barometric gradient distribution, metering system being obtained.
Further, described rock core displacement module comprises constant speed and constant pressure pump, single-pass control valve, one-way control valve, formation water piston container, methane piston container, entrance point pressure sensor, distilled water device;
After constant speed and constant pressure pump is opened, distilled water through distilled water device by one-way control valve controlling party to single-pass control valve, methane piston container and formation water piston container respectively below single-pass control valve, two piston containers have two four single-pass control valves to determine direction of flow, and entrance point pressure sensor is arranged on visual rock core self-clamping module entrance point.
Further, vacuumize module described in and comprise vacuum buffer container, vacuum pump, the first atmospheric valve, the second single-pass;
Vacuum pump is connected with vacuum buffer container, and vacuum buffer container is connected with the first atmospheric valve, the second single-pass, and the second single-pass is connected with visual rock core self-clamping module entrance point.
Further, described visual rock core self-clamping module comprises visual core holding unit, pressing plate, backing plate, nut combinations, liner plate, inlet hole, gum cover, end water tank, sight glass, gland, microscopic examination window, entrance point filter core, port of export filter core, rock core internal pressure sensor, Di Shui inlet opening, outlet pressures sensor;
Have microexamination window in the middle part of pressing plate, backing plate is arranged between described pressing plate and sight glass; The periphery of backing plate and sight glass is provided with two described liner plates, and a liner plate is arranged on pressing plate lower end, and another is arranged on described gland upper end; There is cavity gland inside, be provided with described core chamber, Di Shui inlet opening, end water tank, gum cover, rock core internal pressure sensor, entrance point filter core, port of export filter core, wherein entrance point filter core and port of export filter core are separately positioned on core chamber front end and end, and cavity is arranged on the below of sight glass; Pressing plate is fixedly connected with described gland by stud; Gland front is provided with inlet hole, and inlet hole is connected with rock core displacement module.
Further, Fluid Dynamics module of the described end comprises the second single-pass, end water piston container, bottom water drive for pump, end water pressure detecting sensor;
Bottom water drive is connected with end water piston container for pump, and end water piston container is connected with the second single-pass with end water pressure sensor, and the second single-pass and visual rock core accommodate water hole entrance point at the bottom of module and be connected;
Further, described confined pressure analog module comprises automatic confined pressure tracking pump, ring pressure pressure sensor, the second atmospheric valve;
Automatic confined pressure is followed the tracks of pump and is connected with the second atmospheric valve, ring pressure pressure sensor, automatic confined pressure is followed the tracks of pump and is connected with visual rock core self-clamping module, it is ring pressure pressure sensor that automatic confined pressure follows the tracks of the pump left side, and here is the second atmospheric valve, connects visual rock core self-clamping module above;
Further, described back pressure module comprises backpressure pump, back pressure pressure sensor, back-pressure valve;
After back-pressure valve is connected with backpressure pump, back pressure pressure sensor, connect with the visual rock core self-clamping module port of export.
Further, described metering module comprises: filter core, two-way valve, gas-liquid separator, automatic gas mass flowmenter, electronic balance;
Be connected with visual outlet port of rock core holder after filter core is connected with bidirectional control valve, bidirectional control valve connects gas-liquid separator, liquid/gas separator is divided to be connected with electronic balance, automatic gas mass flowmenter, electronic balance is arranged on below gas-liquid separator, and automatic gas mass flowmenter is arranged on the left side of gas-liquid separator.
Further, described micro-digital image sub-module comprises the computer of microscope, video camera, microscope and camera interface, built-in program control shooting software;
Connect with camera interface with microscope above microscope, aim at the microscopic observation window in visual rock core self-clamping module below; Micro-ly to connect with camera interface and video camera, video camera via line is connected computer, the program control shooting software of built-in computer.
Further, described rock core displacement module, visual rock core self-clamping module, end Fluid Dynamics module installation are in temperature control box inside;
Described temperature control and data acquisition module comprise seven pressure sensors, data acquisition board, computer systems; Data acquisition board is arranged at temperature control box outside and is connected with computer system; Two pressure sensors are distributed in visual rock core self-clamping module into and out of end, and two are arranged on visual core holding unit inside, and a pressure sensor is arranged in back pressure module, and one is arranged in confined pressure module, and one is arranged in end water module.
Coalbed methane reservoir coal dust generation provided by the invention, migration, sedimentation, blocking dynamic evaluation instrument, design first, manufacture a set of can under lab simulation coal bed gas condition the generation of reservoir coal dust, migration, sedimentation, blocking dynamic evaluation experimental equipment, fill up domestic blank about coal bed gas coal dust research physical analogy art, established solid foundation for coal bed gas improves the further developing of recovery efficiency technique; Di Shui inlet opening and tank is adopted to simulate end water situation of change first; By producing fluid level situation of change in pit shaft during the water pumping gas production of inlet and outlet pressure differential mode plan; This equipment also can simulate confined pressure pressure, bottom pressure, temperature condition suffered by mining site coal petrography, more presses close to the actual conditions of reservoir; Can when testing by the generation position of imaging device Real Time Observation coal dust, blocking, transport conditions; Different pressures, different in flow rate, water content of the different ends can be carried out experimental study is affected on coal dust; Metering module can be separated automatically to gas, liquid, solid three-phase, and real time record gas, liquid output; Data acquisition module can by the pressure of modules, flow velocity, product water, the full-automatic record of aerogenesis data, experimentation achieves unmanned, have record data fast, accurately, automaticity high, in addition, structure of the present invention is simple, easy to operate, stability is high, has good promotional value and using value.
Accompanying drawing explanation
Fig. 1 be the embodiment of the present invention provide the generation of coalbed methane reservoir coal dust, migration, sedimentation, blocking dynamic evaluation instrument structured flowchart;
Fig. 2 be the embodiment of the present invention provide a kind of coalbed methane reservoir coal dust generation, migration, sedimentation, blocking dynamic evaluation instrument structural representation;
Fig. 3 is the visual rock sample clamper sectional structure chart that the embodiment of the present invention provides.
Detailed description of the invention
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.
Fig. 1 shows the structure embodiments providing the generation of coalbed methane reservoir coal dust, migration, sedimentation, blocking dynamic evaluation instrument.Illustrate only part related to the present invention for convenience of explanation.
This coalbed methane reservoir coal dust generation, migration, sedimentation, blocking dynamic evaluation instrument comprise:
Rock core displacement module, for simulating, mining site water pumping gas production is single-phase, the Two-phase flow stage provides flowing displacement power;
Vacuumizing module, be connected with described visual rock core self-clamping module, making for being evacuated by rock core in rock core displacement module methane gas fully and the abundant Contact-sorption of rock sample simulate water environment at the bottom of reservoir with stratum water saturation;
Visual rock core self-clamping module, with described rock core displacement module, metering module, confined pressure module, back pressure module, vacuumize module, end Fluid Dynamics module, micro-digital image module, metering module be connected, for by adopting the generation of the true rock sample simulation coal dust being derived from coal seam, migration, sedimentation, blocking behavior and rock core internal pressure gradient, resolving relation between pressure, different producing pressure differential, different in flow rate;
End Fluid Dynamics module, is connected with described visual rock core self-clamping module, for simulating in coal bed gas gas well water pumping gas production process, and moisture situation bottom the reservoir of coal seam;
Confined pressure analog module, be connected with described visual rock core self-clamping module, confined pressure situation of change suffered by reservoir country rock during for simulating mining site water pumping gas production, confined pressure situation suffered by country rock determines rock mesopore structural deformation conditions, pore structure distortion with coal seam aerogenesis, produces water, producing coal powder is in close relations, stream press and confined pressure jointly determine coal dust transport conditions;
Back pressure module, be connected with described visual rock core self-clamping module, flowing bottomhole pressure (FBHP) and producing fluid level situation of change when back pressure module and rock core displacement module simulate mining site water pumping gas production jointly, flowing bottomhole pressure (FBHP) size during back pressure module simulation gas well liquid loading, the size of flowing bottomhole pressure (FBHP) and aerogenesis, produce water, producing coal powder is in close relations, when also can simulate water pumping gas production by controlling flowing bottomhole pressure (FBHP) in gas well the change of producing fluid level on the impact of water pumping gas production;
Metering module, be connected with described visual rock core self-clamping module, for the gas, liquid, solid three-phase fluid produced from visual rock core self-clamping module is progressively separated by specific mode, and the output of automatic gauge gas, liquid, main analog mining site gas well separate measurement device;
Micro-digital image sub-module, is connected with described visual rock core self-clamping module, and for taking rock sample surface picture or recording a video to coal dust migration, record coal dust produces position, migration pathway and migration consequence;
Temperature control and data acquisition module, temperature control is for simulating the inner actual temperature of reservoir, and the aquifer yield that rock core is clamped import and export pressure by data acquisition, rock core diverse location pressure distribution situation, different confined pressure pressure, different back pressure pressure, different layering inner fluid speed, barometric gradient distribution, metering system obtain, gas production are automatically recorded in time by sensor and data acquisition panel.
As a prioritization scheme of the embodiment of the present invention, rock core displacement module comprises constant speed and constant pressure pump, single-pass control valve, one-way control valve, formation water piston container, methane piston container, entrance point pressure sensor, distilled water device.
The major function of one-way cock is to control to constant speed and constant pressure pump feed flow and makes the liquid supplied oppositely to flow in distilled water;
The major function of constant speed and constant pressure pump is as visual rock core self-clamping module provides power, is controlled visual rock core self-clamping module entrance point driven power size by constant speed and constant pressure pump, single-pass control valve, one-way control valve, formation water piston container, methane piston container, a distilled water device;
The function of the first single-pass valve determines fluid flow direction;
Formation water piston container and methane piston container are for the fluid pumped into slowly is promoted fluid in container through entering visual rock core self-clamping module by the piston propeller of piston intermediate receptacle;
The major function of inlet pressure sensor is Real-Time Monitoring visual core holding unit module inlet displacement end pressure size.
As a prioritization scheme of the embodiment of the present invention, vacuumize module and comprise vacuum buffer container, vacuum pump, the first atmospheric valve, the first single-pass.
The function of vacuum pump is that the rock sample in visual rock core self-clamping module vacuumizes by cooperation first single-pass;
Vacuum buffer container major function prevents from fluid in visual rock core blessing module from flowing directly into vacuum pump to cause damage to vacuum pump;
The function of the first atmospheric valve is after having vacuumized, and is discharged by unnecessary pressure by the first atmospheric valve 10.
As a prioritization scheme of the embodiment of the present invention, visual rock core self-clamping module comprises visual core holding unit, pressing plate, backing plate, nut combinations, liner plate, inlet hole, gum cover, end water tank, sight glass, gland, microscopic examination window, entrance point filter core, port of export filter core, rock core internal pressure sensor, Di Shui inlet opening, outlet pressures sensor.
After visual core holding unit put into by rock sample, in order core holding unit is assembled, by this module and rock core displacement module, vacuumize module, confined pressure module, back pressure module, end Fluid Dynamics module, microimaging module, metering module couples together, vacuumize module and the rock sample in visual rock core self-clamping module is vacuumized saturation water, Fluid Dynamics module simulation stratum, the end is containing end water content, confined pressure module provides confined pressure for the rock sample in clamper, back pressure module provides back pressure for rock sample, rock core displacement module provides driving power, microimaging module real time record gas, liquid, Gu the motor behavior of three-phase in rock sample pore structure, metering module is by the gas of visual rock core self-clamping module fluid, liquid, Gu three-phase is progressively separated and accurate-metering.
As a prioritization scheme of the embodiment of the present invention, end Fluid Dynamics module comprises the second single-pass, end water piston container, bottom water drive for pump; Bottom water drive, controls to enter water content at the bottom of rock core displacement module simulation by the second single-pass for end water piston container provides driving pressure for pump.
As a prioritization scheme of the embodiment of the present invention, confined pressure analog module comprises automatic confined pressure and follows the tracks of pump, ring pressure pressure sensor, the second atmospheric valve;
As a prioritization scheme of the embodiment of the present invention, back pressure module comprises backpressure pump, back pressure pressure sensor, back-pressure valve; Backpressure pump provides the size of back pressure, and back-pressure valve Main Function is that valve is opened automatically, and back pressure pressure sensor is for measuring the size of back pressure when back pressure reaches setting size.
As a prioritization scheme of the embodiment of the present invention, metering module comprises: filter core, two-way valve, gas-liquid separator, gaseous mass meter, electronic balance;
The effect of filter core is coal dust to propose to stay in filtration core;
The gas mixed can be separated with liquid by gas-liquid separator automatically;
Electronic balance is by the automatic liquid metering after separation;
Gaseous mass meter is by gas automatic gauge.
As a prioritization scheme of the embodiment of the present invention, micro-digital image sub-module comprises the computer of microscope, video camera, microscope and camera interface, built-in program control shooting software; Microscope is the optical amplifier microscope of 1600 times, can observe rock sample surface micrometre-grade pore structure; Video camera is the imaging camera machine of 3,000,000 pixels, for taking rock sample surface picture or recording a video to coal dust migration; Program control shooting software directly controls acquisition parameters by computer, file storage, conversion etc., and all operations process realizes on computers; Analysis software, by global function image analysis software I MAGEEX, can carry out area shapes and photodensitometry; Fluoroscopic image quantitative analysis; Cell analysis, analyzing biochips, particle count analysis; Material tests; Quality Q C, by the pulverized coal particle number of movement, granular size, quality, moving particles number area occupied size, all can be calculated by software systems.
As a prioritization scheme of the embodiment of the present invention, temperature control and data acquisition module comprise temperature control box, seven pressure sensors.
The structure of the coalbed methane reservoir coal dust generation provided the embodiment of the present invention below in conjunction with Fig. 2 and Fig. 3, migration, sedimentation, blocking dynamic evaluation instrument is further described.
Rock core displacement module forms primarily of a constant speed and constant pressure pump 3, four single-pass control valves 4, one-way control valve 2, formation water piston container 5, methane piston container 6, entrance point pressure sensor 7, distilled water device 1, rock core displacement module and visual rock core accommodate module and are closely connected, its Main Function is that simulation mining site water pumping gas production is single-phase, Two-phase flow time provide flowing displacement power, this module and vacuumize module and coordinate and can test initial preparation to rock sample in addition.The major function of distilled water device 1 is for constant speed and constant pressure pump provides the liquid after purification; The major function of one-way cock 2 is to control to constant speed and constant pressure pump feed flow and makes the liquid supplied oppositely to flow in distilled water; The major function of constant speed and constant pressure pump 3 is as visual rock core self-clamping module provides power, is controlled visual rock core self-clamping module entrance point driven power size by constant speed and constant pressure pump, one-way control valve, single-pass control valve, formation water piston container, methane piston container, a distilled water device; The function of the first single-pass 4 valve determines fluid flow direction; Formation water piston container 5 and 6, methane piston container are fluids contained by reservoir in simulate formation actual formation, fill with methane or coal seam formation water, function is the fluid pumped into slowly to promote fluid in container through entering visual rock core self-clamping module by the piston propeller of piston intermediate receptacle; The major function of inlet pressure sensor 7 is that the visual rock core of Real-Time Monitoring accommodates device module inlet displacement end pressure size; The workflow of rock core displacement module is: fluid controls to enter formation water piston container 5 or methane piston container 6 respectively by distilled water device 1 and one-way cock 2 by constant speed and constant pressure pump 3 displacement pump, then under constant speed and constant pressure pump 3 acts on, pressure transmission made piston container steadily can enter visual rock core blessing module through formation water piston container 5 or methane piston container 6 by propelling fluid (methane or formation water) through the first single-pass 4, entrance point pressure is by inlet pressure sensor 7 Real-Time Monitoring, record; The single-phase flowing of fluid or Two-phase flow when this module simulates mining site water pumping gas production by constant speed and constant pressure pump 3, formation water piston container 5, methane piston container 6, magnitude of pressure differential suffered by rock sample in visualization model is together determined with back pressure module, can observe, Simulation evaluation is single-phase, relation under Two-phase flow condition in rock sample between coal dust and producing pressure differential, flow velocity, different dynamic liquid level height coal dust production can be simulated;
Vacuumize module, Main Function is evacuated by rock core in visual rock core self-clamping module to make methane gas fully and the abundant Contact-sorption of rock sample simulate water environment at the bottom of reservoir with stratum water saturation, this module is by vacuum buffer container 8, vacuum pump 9, first atmospheric valve 10 forms, the function of vacuum pump 9 is that the rock sample that visual rock core accommodates in module vacuumizes by cooperation first single-pass 4, the major function of vacuum buffer container 8 prevents from fluid in visual rock core blessing module from flowing directly into vacuum pump 9 pairs of vacuum pumps 9 to cause damage, the function of the first atmospheric valve 10 is after having vacuumized, pressure is discharged by the first atmospheric valve 10, the workflow of whole module is: after equipment inspection, by whole experimental facilities so device is closed, rock sample is put into visual rock core simultaneously and accommodate module after confined pressure module adds confined pressure, open the first single-pass 4 be connected with vacuum pump 9 and rock sample is vacuumized 24 hours, then the first single-pass 4 is closed and by opening distilled water device 1 after the first atmospheric valve 10 emptying, one-way cock 2, constant speed and constant pressure pump 3, first single-pass 4, methane piston container 6 makes methane gas enter rock sample fully to adsorb 48 hours, then close the first single-pass 4, methane piston container 6, first single-pass 4, open single-pass 27, end water piston container 28, bottom water drive is for pump 29, end water-aspirator pressure sensor 30 makes end water enter rock sample fully saturated 48 hours, then close,
Visual rock core accommodates module by visual core holding unit 11, pressing plate 12, backing plate 13, nut combinations 14, liner plate 15, inlet hole 16, gum cover 17, end water tank 18, sight glass 19, gland 20, microscopic examination window 21, entrance point filter core 22, port of export filter core 23, rock core internal pressure sensor 24, Di Shui inlet opening 25, outlet pressures sensor 26 is formed, and its major function is by adopting the true rock sample being derived from coal seam to simulate different permeability, the generation of coal dust under different pore structures, migration, sedimentation, blocking behavior and rock core internal pressure gradient, resolve pressure, different producing pressure differential, relation between different in flow rate, this module is combined with program control and micro-digital image sub-module, just can be got off in face by motor behavior or the photograph of coal dust in rock sample during experiment displacement or real time record of making a video recording on computers, people can observe the source of coal dust by computer screen, can observe in different mining conditions intuitively, different pressure, different in flow rate, single, the startup of coal dust under biphasic condition, the migration of coal dust, the sedimentation of coal dust, the blocking of coal dust, can observe the relation between coal dust motion and coal petrography pore structure, can also observe coal dust, gas, the interphase interaction behavior of water.Visual core holding unit is by a simulation Di Shui inlet opening 25, a ring pressure hole, an entrance point, a port of export, two rock core internal pressure sensors 24, an entrance point filter core 22, a port of export filter core 23, a pressing plate 12, a backing plate 13, 12 nuts 14 combine, two liner plates 15, a rock sample gum cover 17, water tank 18 at the bottom of one, sight glass 19, a gland 20, 4 display watch windows 21 form, concrete structure figure is shown in accompanying drawing 2, visual rock core accommodates module can bear 80MPa pressure, 120 degree celsius temperature, coal bed gas well shaft bottom true temperature pressure can be simulated, bottom, Di Shui inlet opening 25 is connected with end Fluid Dynamics module, top, Di Shui inlet opening 25 connects with end water tank 18, ring pressure hole is connected with confined pressure module, entrance point connects with rock core displacement module, the port of export is connected with back pressure module, metering module, entrance point filter core 22 is arranged between entrance point and rock sample, prevent impurity in formation water or methane gas from entering rock core, plugging hole gap structure, affect primary permeability, port of export filter core 23 is arranged between rock sample and the port of export, prevents the bulky grain produced in rock sample in experimentation from entering pipeline and causes pipeline to block, end water tank 18 is above core chamber, can hold long 10 centimetres, the coal petrography rock beam of wide 10 centimetres, thickness 2.5 centimetres, gum cover 17 is arranged between end water tank 18 and gland 20, and effect is to hold rock core and transmission of pressure, and when loading confined pressure, pressure makes gum cover 17 distortion make gum cover 17 tightly hold rock sample by hydraulic oil, prevents from loosening in experimentation, the horizontal side of visual rock core self-clamping module is uniform-distribution with two rock core internal pressure sensors 24, the inner diverse location barometric gradient change of rock sample in monitoring experiment process, the workflow of this module is: fluid reaches outlet through visual core holding unit 11 after formation water piston container 5 or methane piston container 6 enter entrance point, by confined pressure module, confined pressure is applied to rock sample in the process, by producing fluid level height in import pump and back pressure module simulation flowing bottomhole pressure (FBHP) and pit shaft, by this end water module simulation, control water content at the bottom of each reservoir rock sample, the gas, water, the coal dust that are flowed out by metering module monitoring,
End Fluid Dynamics module is made up of for pump 29 and end water-aspirator pressure sensor 30 the second single-pass 27, end water piston container 28, bottom water drive, and its function is in simulation coal bed gas gas well water pumping gas production process, moisture situation bottom the reservoir of coal seam.Bottom water drive, controls to enter visual rock core self-clamping module simulation end water content by the second single-pass 27 for end water piston container 28 provides driving pressure for pump 29; 28, end water piston container fills with the true bottom water sample in coal seam; The pressure monitoring of end water module is by end water-aspirator pressure sensor 30 real time record; End Fluid Dynamics module work flow process is: bottom coal sample, water content size slowly enters Di Shui inlet opening 25 by end water piston container 28 through the second single-pass 27, then assemble in end water tank 18, evenly advance to rock core top under the pressure effect that bottom water drive provides for pump 29;
Confined pressure analog module, pump 31 is followed the tracks of by an automatic confined pressure, a ring pressure pressure sensor 32, second atmospheric valve 33 forms, confined pressure situation of change suffered by reservoir country rock during the mining site water pumping gas production of confined pressure module simulation, confined pressure situation suffered by country rock determines rock mesopore structural deformation conditions, structural deformation conditions and aerogenesis, produce water, producing coal powder is in close relations, the migration of coal dust is fundamentally limited by the form of coal seam pore structure under different confined pressure.In confined pressure module, automatic confined pressure follows the tracks of pump 31 for visual rock core self-clamping module provides confined pressure, the numerical value of ring pressure pressure sensor 32 Real-Time Monitoring confined pressures, its workflow is: automatically confined pressure is followed the tracks of pump 31 and confined pressure is passed between the visual core holding unit 11 of visual rock core self-clamping module, pressing plate 12 and makes gum cover 17 be out of shape generation confined pressure, and then stress situation suffered by simulation coal petrography, after experiment terminates, by the second atmospheric valve 33 pairs of confined pressures through row unloading;
Back pressure module is made up of backpressure pump 34, back pressure pressure sensor 35, back-pressure valve 36, flowing bottomhole pressure (FBHP) and producing fluid level situation of change when back pressure module and rock core displacement module simulate mining site water pumping gas production jointly, flowing bottomhole pressure (FBHP) size during back pressure module simulation gas well liquid loading, the size of flowing bottomhole pressure (FBHP) and aerogenesis, produce water, producing coal powder is in close relations, when also can simulate water pumping gas production by controlling flowing bottomhole pressure (FBHP), in gas well, the change of producing fluid level is on the impact of water pumping gas production.In back pressure module, backpressure pump 34 provides the size of back pressure, back-pressure valve 36 Main Function is when back pressure reaches setting size, valve is opened automatically, back-pressure valve 36 quits work, the fluid that the displacement of visual core holding unit 11 goes out enters metering module, when being less than the back pressure numerical value of setting, valve closes automatically, back-pressure valve 36 stops after starting working and back pressure being loaded on setting numerical value automatically, now in flow shear stress core holding unit 11 produce fluid and do not enter metering system, the size of back pressure is by back pressure pressure sensor 35 instantaneous measurement.Its workflow is: back-pressure valve 36 controls the pressure size that backpressure pump 34 produces, the generation of numerical value then has back pressure pressure sensor 35 record, the difference of back pressure module and displacement inlet pressure determines in rock sample receives magnitude of pressure differential, bottom pressure size during pressure reduction simulation gas well liquid loading, pressure size is closely related with coal dust;
Metering module, be made up of filter core 37, two-way valve 38, gas-liquid separator 39, mass-flow gas meter 40, electronic balance 41, its function is the gas, liquid, solid three-phase fluid produced from visual core holding unit 11 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 the rock core port of export flows out, coal dust may be comprised, the effect of filter core 37 is coal dust to propose to stay in filtration core, gas-liquid separator 39, the gas mixed can be separated automatically with liquid, liquid after separation is by electronic balance 41 automatic gauge, and gas is then by mass-flow gas meter 40 automatic gauge.Its workflow is: concrete mode is that gas, liquid, solid fluid-mixing is after visual rock core self-clamping module outlet 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 39, gas phase is measured by automatic gas mass flowmenter 40, and liquid quality is monitored by electronic balance 41.
Micro-digital image sub-module is made up of the computer 45 of microscope 42, video camera 44, microscope and camera interface 43, built-in program control shooting software, and micro-42 is the optical amplifier microscope of 1600 times, can observe rock sample surface micrometre-grade pore structure; Video camera 44 is the imaging camera machine of 3,000,000 pixels, for taking rock sample surface picture or recording a video to coal dust migration; Program control shooting software 45 directly controls acquisition parameters by computer, file storage, conversion etc., and all operations process realizes on computers; Analysis software, by global function image analysis software I MAGEEX, can carry out area shapes and photodensitometry; Fluoroscopic image quantitative analysis; Cell analysis, analyzing biochips, particle count analysis; Material tests; Quality Q C, by the pulverized coal particle number of movement, granular size, quality, moving particles number area occupied size, all can be calculated by software systems.
Temperature control and data acquisition module, by a temperature control box 46, seven pressure sensors are formed, major function is the inner actual temperature of simulation reservoir and visual rock core self-clamping module is entered, outlet pressure, rock core diverse location pressure distribution situation, different confined pressure pressure, different back pressure pressure, different layering inner fluid speed, barometric gradient distributes, the aquifer yield that metering system obtains, gas production 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.
Below in conjunction with the generation of equipment coal bed gas coal dust, migration, sedimentation, blocking HTHP dynamic evaluation instrument, technical scheme of the present invention is 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 being opened by seven modular systems, runs 1 ~ 2 hour, and whether the check and correction of the sealing of checkout equipment all parts, operating condition and sensor is correct;
3. opening temp. control and data acquisition module, open entrance point pressure sensor 7, rock core internal pressure sensor 24, outlet pressures sensor 26, end water-aspirator pressure sensor 30, ring pressure pressure sensor 32, be heated to coal bed gas formation temperature by temperature control box 46, and keep temperature-resistant in experimentation.Various kinds of sensors one direct-open, guarantees the data each position being detected in time;
4. vacuumize, absorption, simulation original bottom water: 1. guarantee that the coal seam rock sample of having polished after true(-)running, can be put into visual core holding unit 11, then close the first single-pass 4 by whole equipment, two-way valve 38, opens vacuum buffer container 8, the first single-pass 4 above vacuum pump 9 and rock core import route, closes after vacuumizing 24 hours and vacuumizes module, then open distilled water device 1, one-way cock 2, constant speed and constant pressure pump 3 and the first single-pass 4, methane piston container 6, first single-pass 4 circuit, methane is extremely slowly injected visual core holding unit 11 by 1, injection length is 48 hours, pressure must slowly promote methane piston container 6 and slowly enter visual core holding unit 11, in the process by the mouth end pressure sensor 7 in visual core holding unit 11, rock core internal pressure sensor 24, outlet pressures sensor 26, end water-aspirator pressure sensor 30, ring pressure pressure sensor 32 is opened, and monitors and records confined pressure in rock core in time, the change of stream pressure, then closes and the first single-pass 4, methane piston container 6, first single-pass 4 circuit,
2. will with single-pass 27, end water piston container 28, bottom water drive is for pump 29, end water-aspirator pressure sensor 30, distilled water device 1, one-way cock 2, constant speed and constant pressure pump 3, first single-pass 4, formation water piston container 5, first single-pass 4 pipeline is opened, water at the bottom of coal seam formation water and reservoir is slowly injected again with extremely low speed, until when pressure in visual core holding unit 11 is identical with coalbed methane reservoir initial pressure, stop injecting, close the first single-pass 4, formation water piston container 5, first single-pass 4, close 27, end water piston container 28, bottom water drive is for pump 29, end water-aspirator pressure sensor 30 pipeline,
5. open confined pressure module, when opening that automatic confined pressure follows the tracks of pump 31, rock core confined pressure is risen to formation production by ring pressure pressure sensor 32, second atmospheric valve 33 respectively, confined pressure size suffered by the coal petrography reality of coal seam, then stops;
6. open back pressure module, open backpressure pump 34, back pressure pressure sensor 35, back-pressure valve 36, filter core 37, two-way valve 38, by controlling back pressure pressure size, simulate actual mining site flowing bottomhole pressure (FBHP), simulate mining site dynamic liquid level height, coordinate the impact of simulating reservoir pressure reduction difference and coal dust being migrated with rock core displacement module;
7. open metering module, open filter core 37, two-way valve 38, gas-liquid separator 39, gaseous mass meter 40, electronic balance 41, 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 sensor record the change of numerical value;
8. Different factor is observed, is evaluated coal dust migration, open rock core displacement module, end Fluid Dynamics module according to different experiment purposes or regulate back pressure force value size, when evaluating reservoir pressure change of gradient respectively, dynamic liquid level height change time, flow velocity when changing, time single-phase, two-phase flow time coal dust transport conditions, and evaluate the impact of coal dust migration on water pumping gas production;
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 (2)

1. coalbed methane reservoir coal dust generation, migration, sedimentation, a blocking dynamic evaluation instrument, is characterized in that, described dynamic evaluation instrument comprises:
Rock core displacement module, for simulating, mining site water pumping gas production is single-phase, Two-phase flow time displacement power is provided;
Vacuumize module, being connected with described rock core displacement module, visual rock core self-clamping module, making for being evacuated by rock sample in visual rock core self-clamping module methane gas fully and the abundant Contact-sorption of rock sample use coal seam formation water saturation simulation reservoir water environment;
Visual rock core self-clamping module, be connected with described rock core displacement module, for by adopting the true rock sample being derived from coal seam to simulate the generation of coal dust under different permeability, different pore structures, migration, sedimentation, blocking behavior and rock core internal pressure gradient, resolve relation between pressure, producing pressure differential, flow velocity;
End Fluid Dynamics module, is connected with described visual rock core self-clamping module, for simulating in coal bed gas gas well water pumping gas production process, and moisture situation bottom the reservoir of coal seam;
Confined pressure module, is connected with described visual rock core self-clamping module, confined pressure situation of change suffered by reservoir country rock during for simulating mining site water pumping gas production;
Back pressure module, is connected with described visual rock core self-clamping module, flowing bottomhole pressure (FBHP) and producing fluid level situation of change during for jointly simulating mining site water pumping gas production with visual rock core self-clamping module;
Metering module, is connected with described visual rock core self-clamping module, for the gas, liquid, solid three-phase fluid produced from visual rock core self-clamping module is progressively separated by specific mode, and the output of automatic gauge gas, liquid;
Micro-digital image sub-module, is connected with described visual rock core self-clamping module, and for taking rock sample surface picture or recording a video to coal dust migration behavior, record coal dust produces position, migration pathway and migration consequence;
Temperature control and data acquisition module, for by automatically recording in time by sensor and data acquisition panel the inner actual temperature of the regulation and control of device temperature simulation reservoir and aquifer yield, gas production for visual rock core self-clamping module inlet and outlet pressure, rock core diverse location pressure distribution situation, different confined pressure pressure, different back pressure pressure, different layering inner fluid speed, barometric gradient distribution, metering system being obtained;
Described temperature control and data acquisition module comprise seven pressure sensors, data acquisition board, computer systems; Data acquisition board is arranged at temperature control box outside and is connected with computer system; Two pressure sensors are distributed in visual rock core self-clamping module into and out of end, and two are arranged on visual core holding unit inside, and a pressure sensor is arranged in back pressure module, and one is arranged in confined pressure module, and one is arranged in end water module;
Described rock core displacement module comprises constant speed and constant pressure pump, single-pass control valve, one-way control valve, formation water piston container, methane piston container, entrance point pressure sensor, distilled water device; Described entrance point pressure sensor is the pressure sensor that temperature control and data acquisition module are arranged on visual rock core self-clamping module inlet side;
After constant speed and constant pressure pump is opened, distilled water through distilled water device by one-way control valve controlling party to single-pass control valve, methane piston container and formation water piston container respectively below single-pass control valve, two piston containers have two single-pass control valves to determine direction of flow, and entrance point pressure sensor is arranged on visual rock core self-clamping module entrance point;
The described module that vacuumizes comprises vacuum buffer container, vacuum pump, the first atmospheric valve, the second single-pass;
Vacuum pump is connected with vacuum buffer container, and vacuum buffer container is connected with the first atmospheric valve, the second single-pass, and the second single-pass connects with visual rock core self-clamping module;
Described visual rock core self-clamping module comprises visual core holding unit, pressing plate, backing plate, nut combinations, liner plate, inlet hole, gum cover, end water tank, sight glass, gland, microscopic examination window, entrance point filter core, port of export filter core, two rock core internal pressure sensors, Di Shui inlet opening, outlet pressures sensor; Described rock core internal pressure sensor is the pressure sensor that temperature control and data acquisition module are arranged on visual core holding unit inside, and described outlet pressures sensor is the pressure sensor that temperature control and data acquisition module are arranged on that visual rock core self-clamping module goes out end;
Be provided with microexamination window in the middle part of pressing plate, backing plate is arranged between described pressing plate and sight glass; The periphery of backing plate and sight glass is provided with two described liner plates, and a liner plate is arranged on pressing plate lower end, and another is arranged on described gland upper end; There is cavity gland inside, be provided with described core chamber, Di Shui inlet opening, end water tank, gum cover, rock core internal pressure sensor, entrance point filter core, port of export filter core, wherein entrance point filter core and port of export filter core are separately positioned on core chamber front end and end, and cavity is arranged on the below of sight glass; Pressing plate is fixedly connected with described gland by stud; Gland front is provided with inlet hole, and inlet hole is connected with rock core displacement module;
Described confined pressure module comprises automatic confined pressure and follows the tracks of pump, ring pressure pressure sensor, the second atmospheric valve; Described ring pressure pressure sensor is the pressure sensor that temperature control and data acquisition module are arranged in confined pressure module;
Automatic confined pressure is followed the tracks of pump and is connected with the second atmospheric valve, ring pressure pressure sensor, automatic confined pressure is followed the tracks of pump and is connected with visual rock core self-clamping module, it is ring pressure pressure sensor that automatic confined pressure follows the tracks of the pump left side, and here is the second atmospheric valve, connects visual rock core self-clamping module above;
Described back pressure module comprises backpressure pump, back pressure pressure sensor, back-pressure valve; Described back pressure pressure sensor is the pressure sensor that temperature control and data acquisition module are arranged in back pressure module;
After back-pressure valve is connected with backpressure pump, back pressure pressure sensor, connect with the visual rock core self-clamping module port of export;
Described metering module comprises: filter core, two-way valve, gas-liquid separator, automatic gas mass flowmenter, electronic balance;
Be connected with visual outlet port of rock core holder after filter core is connected with bidirectional control valve, bidirectional control valve connects gas-liquid separator, gas-liquid separator is connected with electronic balance, automatic gas mass flowmenter, electronic balance is arranged on below gas-liquid separator, and automatic gas mass flowmenter is arranged on the left side of gas-liquid separator;
Described micro-digital image sub-module comprises the computer of microscope, video camera, microscope and camera interface, built-in program control shooting software;
Connect with camera interface with microscope above microscope, aim at the microscopic observation window in visual rock core self-clamping module below; Micro-ly to connect with camera interface and video camera, video camera via line is connected computer, the program control shooting software of built-in computer;
Described rock core displacement module, visual rock core self-clamping module, end Fluid Dynamics module installation are inner at temperature control box.
2. a kind of coalbed methane reservoir coal dust generation as claimed in claim 1, migration, sedimentation, blocking dynamic evaluation instrument, is characterized in that, Fluid Dynamics module of the described end comprises the second single-pass, end water piston container, bottom water drive for pump, end water pressure detecting sensor; Water pressure detecting sensor of the described end is the pressure sensor that temperature control and data acquisition module are arranged in end Fluid Dynamics module;
Bottom water drive is connected with end water piston container for pump, and end water piston container is connected with the second single-pass with end water pressure sensor, and the second single-pass connects with water hole entrance point at the bottom of visual rock core self-clamping module.
CN201310055324.0A 2013-02-21 2013-02-21 The generation of coalbed methane reservoir coal dust, migration, sedimentation, blocking dynamic evaluation instrument CN103256045B (en)

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