CN106525889B - The experimental provision and method of varying aperture during a kind of fine and close oily blowdown of simulation - Google Patents
The experimental provision and method of varying aperture during a kind of fine and close oily blowdown of simulation Download PDFInfo
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- CN106525889B CN106525889B CN201610972239.4A CN201610972239A CN106525889B CN 106525889 B CN106525889 B CN 106525889B CN 201610972239 A CN201610972239 A CN 201610972239A CN 106525889 B CN106525889 B CN 106525889B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N24/00—Investigating or analyzing materials by the use of nuclear magnetic resonance, electron paramagnetic resonance or other spin effects
- G01N24/08—Investigating or analyzing materials by the use of nuclear magnetic resonance, electron paramagnetic resonance or other spin effects by using nuclear magnetic resonance
Abstract
The invention discloses the device and methods of rock core varying aperture state during a kind of fine and close oily blowdown of simulation, it includes: rock core pressure-loaded unit (1), core holding unit (2), core data acquisition unit (3), Nuclear Magnetic Resonance (4).The present invention is by the way that the fine and close oil rock heart to be placed under original condition of triaxial stress, change varying aperture caused by effective stress based on Nuclear Magnetic Resonance and radial displacement transducer association evaluation, realize the varying aperture measurement based on the interpretation of result for combining radial displacement measurement and nuclear magnetic resonance test, have the characteristics that measurement accuracy is high, representativeness is strong, strong operability, be suitble to promote and apply, the oily blowdown of densification is horizontal and oil yield has important practical significance to improving.
Description
Technical field
The invention belongs to oil development technical field, in particular to aperture during a kind of fine and close oily blowdown of simulation
The experimental provision and method of variation.
Background technique
Fine and close oil is the important petroleum resources in China, in fine and close oily recovery process, with the output of reservoir internal flow,
Pore pressure reduces, and causes the effective stress of rock to increase, causes the variation of pore structure and pore volume, pore volume occur
Diminution, closing of fracture phenomena such as, this variation directly reduces seepage flow of the fine and close oil in reservoir, and fine and close oil well is caused to put into
After exploitation, yield is successively decreased rapidly, and yield can be decremented to about 2/3 after 1 year.Analyze the biography that pore size caused by stress changes
System method is to carry out stress sensitive experiment according to SY/T 5358-2010 professional standard.It keeps pore pressure constant in experiment, changes
Become confining pressure to simulate influence of the effective stress to permeability, and then the deformation of indirect analysis rock matrix particle.But by
In the micro-nano hole of fine and close oily reservoir development, it is rich in clay, stress variation caused by blowdown is mainly reflected in aperture
It shrinks in the compacting with clay mineral.Meanwhile before conventional chambers test, rock reservoir primitive stress and hole are not restored to
Under gap fluid pressure condition, and it can not consider influence of the ground stress deviation to varying aperture, therefore the accuracy of test result, representative
Property is strong not enough.As it can be seen that cannot simulate fine and close oily failure by the analysis method for changing confining pressure, testing permeability variation
The physical process of formula exploitation.
Summary of the invention
The object of the present invention is to provide a kind of experimental provision of varying aperture during fine and close oily blowdown of simulation and
Method is realized based on the varying aperture measurement for the interpretation of result for combining radial displacement measurement and nuclear magnetic resonance test, is further mentioned
High-densit oil blowdown level and oil yield.
The technical scheme is that during a kind of fine and close oily blowdown of simulation rock core varying aperture state dress
It sets, it includes: rock core pressure-loaded unit (1), core holding unit (2), core data acquisition unit (3), Nuclear Magnetic Resonance
(4)；
The rock core pressure-loaded unit (1) is used to simulate the pressure of rock core carrying during fine and close oily blowdown,
It include: ISCO pump (11), left side working solution piston container (12), right side back-pressure valve (13), confining pressure valve (14)；The ISCO pump
(11) for pushing the piston in the left side working solution piston container (12) with 40MPa following pressures；The left side working solution
Piston container (12) infuses neutral kerosene for pumping to apply 40MPa to rock core by left-handed tight plug (23) inner tube of core holding unit
Displacement pressure below；The right side back-pressure valve (13) by the tight plug of core holding unit dextrorotation (25) inner tube to rock core for being applied
Add 30MPa axial compressive force below；The confining pressure valve (14) is used to apply 50MPa into core holding unit shell (21) below
Pressure forms 50MPa pressure below around the core holding unit rubber tube (24), makes the core holding unit rubber tube
(24) rock core can be clamped with 50MPa pressure below, prevents neutral kerosene along rock core and core holding unit rubber tube (24)
Gap flowing；
The core holding unit (2) is for the rock core that is fixedly clamped, comprising: core holding unit shell (21), core holding unit
The left-handed tight plug (23) of sealing cover (22), core holding unit, core holding unit rubber tube (24), the tight plug of core holding unit dextrorotation
(25), pressurized handgrip (26) be can be manually rotated；It is cavity structure, the core holding unit inside the core holding unit shell (21)
Rubber tube (24) is located at cavity inside, when by the confining pressure valve (14) to being pumped into water inside the core holding unit shell (21)
When with on-load pressure, after the core holding unit shell (21) and the core holding unit rubber tube (24) compression, formed closed
State；The core holding unit sealing cover (22) is convenient for simultaneously for closing core holding unit shell (21) internal cavities
It installs or removes the radial displacement transducer (34) in cavity inside；The left-handed tight plug (23) of core holding unit is for sealing
The rock core in the core holding unit rubber tube (24) is closed, left-handed tight plug (23) inner tube of core holding unit is passed to rock core
Pass the kerosene pressure of left side working solution piston container (12) load；The core holding unit rubber tube (24) is used for built-in rock
The heart clamps rock core after the core holding unit rubber tube (24) is received through the pressure of confining pressure valve (14) load；It is described
The tight plug of core holding unit dextrorotation (25) is used for the rock core being enclosed in the core holding unit rubber tube (24), the rock core folder
The tight plug of holder dextrorotation (25) inner tube conducts the pressure that the right side back-pressure valve (13) loads to rock core；It is described to can be manually rotated pressurization
Handle (26) is fixed on the tight plug of core holding unit dextrorotation (25), and can be manually rotated pressurized handgrip (26) described in rotation can band
The tight plug of core holding unit dextrorotation (25) axial movement is moved, to rock core on-load pressure or reduces rock core pressure；
The data acquisition unit (3) includes: pump injection pressure force snesor (31), back pressure pressure sensor (32), flow prison
Survey device (33), radial displacement transducer (34)；The pump injection pressure force snesor (31) shows the left side working solution for measuring
Piston container (12) loads the pressure on rock core；The back pressure pressure sensor (32) shows the right side back pressure for measuring
Valve (13) loads the pressure on rock core；The flow monitor (33) is used for the liquid flow that reception and measurement is flowed out from rock core
Amount；
The Nuclear Magnetic Resonance (4) is used to provide nuclear-magnetism magnetic field for the core holding unit (2), and measures core experiment mistake
The variation that T2 is composed in journey.
Rock core varying aperture state measurement strategy during a kind of fine and close oily blowdown, it uses a kind of above-mentioned simulation
The device of rock core varying aperture state during fine and close oil blowdown, it includes the following steps:
A. reservoir core pore fluid pressure, overburden stress and horizontal crustal stress are determined；
If: stratum water density is ρw, depth of reservoirs h, acceleration of gravity g, density of earth formations ρs, tectonic stress σs、
Rock Poisson Ratio Using is v；
Then:
Pore fluid pressure Pp are as follows:
Pp=ρwgh
Overburden pressure σ v are as follows:
Horizontal crustal stress σ h are as follows:
σh=v σv+σs
B. rubber tube radial deformation is measured；
2.5cm solid cylindrical steel vacation rock core is put into clamper rubber tube, rubber tube confining pressure is loaded onto σv-Pp,
It can be manually rotated pressurized handgrip, axial stress increased into σh-Pp, 5 effective stress points are set, according to identical size,
It is synchronous to reduce confining pressure and axis pressure, measure the radial-deformation of rubber tube；
C. restore cylindrical rock core primitive stress and pore pressure；
If: cylindrical rock core radius is R, length L, porosity arePermeability is k, surface relaxivity ρ；
Fine and close oily rock core vacuumizing is saturated neutral kerosene, and rock core is put into clamper rubber tube, to be gradually pressurized
Mode adjust driving pressure and back pressure, rock core pore pressure is increased into the original pore fluid pressure of reservoir, confining pressure increases to
Overlying strata ply stress, axis pressure increase to horizontal crustal stress；
D. the fine and close oily reservoir failure recovery process of simulation；
A certain flow velocity is selected, neutral kerosene displacement is carried out, according to 5 effective stress points that step A is set, is sequentially reduced out
Mouth back pressure, simulating reservoir pore pressure in failure recovery process reduces caused reservoir stress sensitive damage, record permeability, diameter
Change to displacement R and nuclear magnetic resonance T 2 spectrum；
E. according to rock core radial displacement Δ R, cylindrical rock core varying aperture Δ r, the i.e. radial displacement of capillary are obtained；
If: capillary number is n inside cylindrical rock core, and sample radial displacement is Δ R,
Then: cylindrical rock core radial dimension reduces Δ r, caused cylindrical rock core change in size are as follows:
[πR2-π(R-Δr)2] L=π (2R Δ R- Δ R2)L
Capillary aperture reduces variation caused by Δ r are as follows:
πn(2rΔr-Δr2)L
The reduction amount in capillary aperture are as follows:
F: changed according to rock core nuclear magnetic resonance T 2 spectrum, obtain the changes delta r in cylindrical rock core aperture；
If: the nuclear magnetic resonance T 2 spectrum area under spectrum changes delta A at a certain aperture of cylindrical rock corer, aqueous volume conversion factor
For α；
Then: nuclear magnetic resonance T 2 spectrum can be converted into cylindrical rock core aperture radius r are as follows:
R=2T2ρ
Above formula is it can be seen that the area under spectrum of nuclear magnetic resonance T 2 spectrum is then directly proportional to water content；
Then: a certain aperture interior moisture content changes delta V of cylindrical rock corer:
ΔVr=α Δ Ar
Cylindrical rock core aperture reduction amount Δ r are as follows:
G: the varying aperture Δ r in comparison step E and step F, obtain analyzing aperture during fine and close oily blowdown
The state of variation.
The present invention is based on Nuclear Magnetic Resonance and radial displacement by the way that the fine and close oil rock heart to be placed under original condition of triaxial stress
Sensor association evaluation changes varying aperture caused by effective stress, realizes based on the radial displacement measurement of joint and nuclear magnetic resonance
The varying aperture of the interpretation of result of test measures, and has measurement accuracy height, representative strong, strong operability, is suitble to promote and answer
With the features such as, to improving, fine and close oily blowdown is horizontal and oil yield has important practical significance.
Detailed description of the invention
Fig. 1 is apparatus of the present invention schematic diagram；
Fig. 2 is the method for the present invention flow chart.
Specific embodiment
Embodiment 1: referring to Fig. 1, the device of rock core varying aperture state during a kind of fine and close oily blowdown of simulation,
It includes: rock core pressure-loaded unit (1), core holding unit (2), core data acquisition unit (3), Nuclear Magnetic Resonance (4)；
The rock core pressure-loaded unit (1) is used to simulate the pressure of rock core carrying during fine and close oily blowdown,
It include: ISCO pump (11), left side working solution piston container (12), right side back-pressure valve (13), confining pressure valve (14)；The ISCO pump
(11) for pushing the piston in the left side working solution piston container (12) with 40MPa following pressures；The left side working solution
Piston container (12) infuses neutral kerosene for pumping to apply 40MPa to rock core by left-handed tight plug (23) inner tube of core holding unit
Displacement pressure below；The right side back-pressure valve (13) by the tight plug of core holding unit dextrorotation (25) inner tube to rock core for being applied
Add 30MPa axial compressive force below；The confining pressure valve (14) is used to apply 50MPa into core holding unit shell (21) below
Pressure forms 50MPa pressure below around the core holding unit rubber tube (24), makes the core holding unit rubber tube
(24) rock core can be clamped with 50MPa pressure below, prevents neutral kerosene along rock core and core holding unit rubber tube (24)
Gap flowing；
The core holding unit (2) is for the rock core that is fixedly clamped, comprising: core holding unit shell (21), core holding unit
The left-handed tight plug (23) of sealing cover (22), core holding unit, core holding unit rubber tube (24), the tight plug of core holding unit dextrorotation
(25), pressurized handgrip (26) be can be manually rotated；It is cavity structure, the core holding unit inside the core holding unit shell (21)
Rubber tube (24) is located at cavity inside, when by the confining pressure valve (14) to being pumped into water inside the core holding unit shell (21)
When with on-load pressure, after the core holding unit shell (21) and the core holding unit rubber tube (24) compression, formed closed
State；The core holding unit sealing cover (22) is convenient for simultaneously for closing core holding unit shell (21) internal cavities
It installs or removes the radial displacement transducer (34) in cavity inside；The left-handed tight plug (23) of core holding unit is for sealing
The rock core in the core holding unit rubber tube (24) is closed, left-handed tight plug (23) inner tube of core holding unit is passed to rock core
Pass the kerosene pressure of left side working solution piston container (12) load；The core holding unit rubber tube (24) is used for built-in rock
The heart clamps rock core after the core holding unit rubber tube (24) is received through the pressure of confining pressure valve (14) load；It is described
The tight plug of core holding unit dextrorotation (25) is used for the rock core being enclosed in the core holding unit rubber tube (24), the rock core folder
The tight plug of holder dextrorotation (25) inner tube conducts the pressure that the right side back-pressure valve (13) loads to rock core；It is described to can be manually rotated pressurization
Handle (26) is fixed on the tight plug of core holding unit dextrorotation (25), and can be manually rotated pressurized handgrip (26) described in rotation can band
The tight plug of core holding unit dextrorotation (25) axial movement is moved, to rock core on-load pressure or reduces rock core pressure；
The data acquisition unit (3) includes: pump injection pressure force snesor (31), back pressure pressure sensor (32), flow prison
Survey device (33), radial displacement transducer (34)；The pump injection pressure force snesor (31) shows the left side working solution for measuring
Piston container (12) loads the pressure on rock core；The back pressure pressure sensor (32) shows the right side back pressure for measuring
Valve (13) loads the pressure on rock core；The flow monitor (33) is used for the liquid flow that reception and measurement is flowed out from rock core
Amount；
The Nuclear Magnetic Resonance (4) is used to provide nuclear-magnetism magnetic field for the core holding unit (2), and measures core experiment mistake
The variation that T2 is composed in journey.
Embodiment 2: referring to fig. 2, rock core varying aperture state measurement strategy during a kind of fine and close oily blowdown, it
Using the device of rock core varying aperture state during a kind of above-mentioned fine and close oily blowdown of simulation, it includes the following steps:
A. reservoir core pore fluid pressure, overburden stress and horizontal crustal stress are determined；
If: stratum water density is ρw, depth of reservoirs h, acceleration of gravity g, density of earth formations ρs, tectonic stress σs、
Rock Poisson Ratio Using is v；
Then:
Pore fluid pressure Pp are as follows:
Pp=ρwgh
Overburden pressure σ v are as follows:
Horizontal crustal stress σ h are as follows:
σh=v σv+σs
B. rubber tube radial deformation is measured；
2.5cm solid cylindrical steel vacation rock core is put into clamper rubber tube, rubber tube confining pressure is loaded onto σv-Pp,
It can be manually rotated pressurized handgrip, axial stress increased into σh-Pp, 5 effective stress points are set, according to identical size,
It is synchronous to reduce confining pressure and axis pressure, measure the radial-deformation of rubber tube；
C. restore cylindrical rock core primitive stress and pore pressure；
If: cylindrical rock core radius is R, length L, porosity arePermeability is k, surface relaxivity ρ；
Fine and close oily rock core vacuumizing is saturated neutral kerosene, and rock core is put into clamper rubber tube, to be gradually pressurized
Mode adjust driving pressure and back pressure, rock core pore pressure is increased into the original pore fluid pressure of reservoir, confining pressure increases to
Overlying strata ply stress, axis pressure increase to horizontal crustal stress；
D. the fine and close oily reservoir failure recovery process of simulation；
A certain flow velocity is selected, neutral kerosene displacement is carried out, according to 5 effective stress points that step A is set, is sequentially reduced out
Mouth back pressure, simulating reservoir pore pressure in failure recovery process reduces caused reservoir stress sensitive damage, record permeability, diameter
Change to displacement R and nuclear magnetic resonance T 2 spectrum；
E. according to rock core radial displacement Δ R, cylindrical rock core varying aperture Δ r, the i.e. radial displacement of capillary are obtained；
If: capillary number is n inside cylindrical rock core, and sample radial displacement is Δ R,
Then: cylindrical rock core radial dimension reduces Δ r, caused cylindrical rock core change in size are as follows:
[πR2-π(R-Δr)2] L=π (2R Δ R- Δ R2)L
Capillary aperture reduces variation caused by Δ r are as follows:
πn(2rΔr-Δr2)L
The reduction amount in capillary aperture are as follows:
F: changed according to rock core nuclear magnetic resonance T 2 spectrum, obtain the changes delta r in cylindrical rock core aperture；
If: the nuclear magnetic resonance T 2 spectrum area under spectrum changes delta A at a certain aperture of cylindrical rock corer, aqueous volume conversion factor
For α；
Then: nuclear magnetic resonance T 2 spectrum can be converted into cylindrical rock core aperture radius r are as follows:
R=2T2ρ
Above formula is it can be seen that the area under spectrum of nuclear magnetic resonance T 2 spectrum is then directly proportional to water content；
Then: a certain aperture interior moisture content changes delta V of cylindrical rock corer:
ΔVr=α Δ Ar
Cylindrical rock core aperture reduction amount Δ r are as follows:
G: the varying aperture Δ r in comparison step E and step F, obtain analyzing aperture during fine and close oily blowdown
The state of variation.
Claims (2)
1. the device of rock core varying aperture state during a kind of fine and close oily blowdown of simulation, which is characterized in that it includes:
Rock core pressure-loaded unit (1), core holding unit (2), core data acquisition unit (3), Nuclear Magnetic Resonance (4)；
The rock core pressure-loaded unit (1) is used to simulate the pressure of rock core carrying during fine and close oily blowdown, comprising:
ISCO pumps (11), left side working solution piston container (12), right side back-pressure valve (13), confining pressure valve (14)；The core holding unit (2)
For the rock core that is fixedly clamped, comprising: core holding unit shell (21), core holding unit sealing cover (22), core holding unit are left-handed
Tight plug (23), the tight plug of core holding unit dextrorotation (25), can be manually rotated pressurized handgrip at core holding unit rubber tube (24)
(26)；
The ISCO pump (11) is used to push the piston in the left side working solution piston container (12) with 40MPa following pressures；
The left side working solution piston container (12) infuses neutral kerosene for pumping to pass through left-handed tight plug (23) inner tube of core holding unit
Apply 40MPa displacement pressure below to rock core；The right side back-pressure valve (13) is used to pass through the tight plug of core holding unit dextrorotation
(25) inner tube applies 30MPa axial compressive force below to rock core；The confining pressure valve (14) is used for core holding unit shell (21)
Interior application 50MPa pressure below forms 50MPa pressure below around the core holding unit rubber tube (24), makes institute
Rock core can be clamped with 50MPa pressure below by stating core holding unit rubber tube (24), prevent neutral kerosene along rock core and rock
It flows in the gap of heart clamp holder rubber tube (24)；
The core data acquisition unit (3) includes: pump injection pressure force snesor (31), back pressure pressure sensor (32), flow prison
Survey device (33), radial displacement transducer (34)；The pump injection pressure force snesor (31) shows the left side working solution for measuring
Piston container (12) loads the pressure on rock core；The back pressure pressure sensor (32) shows the right side back pressure for measuring
Valve (13) loads the pressure on rock core；The flow monitor (33) is used for the liquid flow that reception and measurement is flowed out from rock core
Amount；
It is cavity structure inside the core holding unit shell (21), the core holding unit rubber tube (24) is located in cavity
Portion, when being pumped into water to the core holding unit shell (21) is internal by the confining pressure valve (14) with on-load pressure, the rock
After heart clamp holder shell (21) and the core holding unit rubber tube (24) are pressurized, air-tight state is formed；The core holding unit
Sealing cover (22) is convenient for installing or removing in cavity inside for closing core holding unit shell (21) internal cavities
The radial displacement transducer (34)；The left-handed tight plug (23) of core holding unit is for being enclosed in the core holding unit rubber
Rock core in sebific duct (24), left-handed tight plug (23) inner tube of core holding unit transmit the left side working solution piston to rock core
The kerosene pressure of container (12) load；The core holding unit rubber tube (24) is used for built-in rock core, when the core holding unit
After rubber tube (24) is received through the pressure of confining pressure valve (14) load, rock core is clamped；The core holding unit dextrorotation is tightly blocked up
Head (25) is used for the rock core being enclosed in the core holding unit rubber tube (24), the tight plug of core holding unit dextrorotation (25)
Inner tube conducts the pressure that the right side back-pressure valve (13) loads to rock core；It is described can be manually rotated pressurized handgrip (26) be fixed in it is described
On the tight plug of core holding unit dextrorotation (25), can be manually rotated pressurized handgrip (26) described in rotation can drive the core holding unit right
Plug (25) axial movement is screwed, to rock core on-load pressure or reduces rock core pressure；
The Nuclear Magnetic Resonance (4) is used to provide nuclear-magnetism magnetic field for the core holding unit (2), and during measuring core experiment
The variation of T2 spectrum.
2. rock core varying aperture state measurement strategy during a kind of fine and close oily blowdown, it is used described in claim 1
A kind of fine and close oily blowdown of simulation during rock core varying aperture state device, it is characterised in that: including following step
It is rapid:
A. reservoir core pore fluid pressure, overburden stress and horizontal crustal stress are determined；
If: stratum water density is ρw, depth of reservoirs h, acceleration of gravity g, density of earth formations ρs, tectonic stress σs, rock
Poisson's ratio is ν；
Then:
Pore fluid pressure PpAre as follows:
Pp=ρwgh
Overburden pressure σvAre as follows:
σv=∫0 hρs(h)ghdh
Horizontal crustal stress σhAre as follows:
σh=ν σv+σs
B. rubber tube radial deformation is measured；
2.5cm solid cylindrical steel vacation rock core is put into clamper rubber tube, rubber tube confining pressure is loaded onto σv-Pp, manually
Rotary manual rotary presser handle, increases to σ for axial stressh-Pp, 5 effective stress points are set, it is synchronous according to identical size
Confining pressure and axis pressure are reduced, the radial-deformation of rubber tube is measured；
C. restore cylindrical rock core primitive stress and pore pressure；
If: cylindrical rock core radius is R, length L, porosity arePermeability is k, surface relaxivity ρ；
Fine and close oily rock core vacuumizing is saturated neutral kerosene, and rock core is put into clamper rubber tube, with the side being gradually pressurized
Formula adjusts driving pressure and back pressure, rock core pore pressure is increased to the original pore fluid pressure of reservoir, confining pressure increases to overlying strata
Ply stress, axis pressure increase to horizontal crustal stress；
D. the fine and close oily reservoir failure recovery process of simulation；
A certain flow velocity is selected, neutral kerosene displacement is carried out, according to 5 effective stress points that step A is set, is sequentially reduced and exports back
Pressure, simulating reservoir pore pressure in failure recovery process reduces caused reservoir stress sensitive damage, record permeability, radial position
Move Δ R and nuclear magnetic resonance T 2 spectrum variation；
E. according to rock core radial displacement Δ R, cylindrical rock core varying aperture Δ r, the i.e. radial displacement of capillary are obtained；
If: capillary number is n inside cylindrical rock core, and sample radial displacement is Δ R,
Then: cylindrical rock core radial dimension reduces Δ r, caused cylindrical rock core change in size are as follows:
[πR2-π(R-Δr)2] L=π (2R Δ R- Δ R2)L
Capillary aperture reduces variation caused by Δ r are as follows:
πn(2rΔr-Δr2)L
The reduction amount in capillary aperture are as follows:
F: changed according to rock core nuclear magnetic resonance T 2 spectrum, obtain the changes delta r in cylindrical rock core aperture；
If: the nuclear magnetic resonance T 2 spectrum area under spectrum changes delta A at a certain aperture of cylindrical rock corer, aqueous volume conversion factor be α；
Then: the area under spectrum T of nuclear magnetic resonance T 2 spectrum2Cylindrical rock core aperture radius r can be converted into are as follows:
R=2T2ρ
Above formula is it can be seen that nuclear magnetic resonance T2The area under spectrum of spectrum is then directly proportional to water content；
Then: a certain aperture interior moisture content changes delta V of cylindrical rock corer:
ΔVr=α Δ Ar
Cylindrical rock core aperture reduction amount Δ r are as follows:
G: the varying aperture Δ r in comparison step E and step F, obtain analyzing varying aperture during fine and close oily blowdown
State.
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| CN113406134A (en) * | 2021-06-03 | 2021-09-17 | 中国石油化工股份有限公司 | Testing method and testing device for water-drive pore structure change of loose rock core |
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| CN114137012B (en) * | 2021-10-29 | 2022-11-15 | 合肥综合性国家科学中心能源研究院(安徽省能源实验室) | True triaxial experiment magnetic signal trapping device and application method |
| CN114137013B (en) * | 2021-10-29 | 2022-11-01 | 合肥综合性国家科学中心能源研究院(安徽省能源实验室) | In-situ experiment magnetic signal sensing device and method |
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