CN107807078B - Rock core movable water saturation online detection method under stratum condition - Google Patents
Rock core movable water saturation online detection method under stratum condition Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
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Abstract
The invention relates to an on-line detection method for movable water saturation of a rock core under stratum conditions, which comprises the steps of obtaining an X-ray radiation intensity curve R of each part of the rock core under two conditions of drying and completely saturating stratum water0And R1(ii) a Obtaining an X-ray radiation intensity curve R of each part of the rock core after the rock core is restored to the original water saturation of the reservoir2(ii) a Carrying out displacement experiment by adopting a step-by-step pressurizing air-water displacement mode, and obtaining a plurality of corresponding X-ray radiation intensity curves R of all parts after the end of each step of pressurizing process3(ii) a By means of R0、R1、R2And R3Calculating to obtain movable water saturation values of all parts of the reservoir gas-water migration path; when using R at the end of the run3And calculating the movable water saturation value of each part in the final state. The invention can develop fluid flow experiment under stratum condition, and reflect the change rule of movable water saturation by real-time on-line testing the water saturation of each part of the rock core.
Description
Technical field
The present invention relates to the experimental technique that oil exploration and exploitation field is modeled to hiding with exploitation, specifically a kind of stratum items
Fluid can carry out real-time on-line detecting method to each position mobile water saturation of dust trajectory when rock core is migrated under part.
Background technique
In oil gas field in hiding and development process, water in reservoir will migrate with the injection or output of oil gas.But
It is the difference due to reservoir properties difference and displacement power size, causes in rock core that part water is flowable, part water is not flowable,
Mobile water saturation distribution and changing rule become considerably complicated in reservoir.The real-time online of mobile water saturation is detected for grinding
It is significant to study carefully multiphase porous flow, reservoir gas-bearing property, oil-gas reservoir production water rule etc..
The method of mobile water saturation is mainly conventional core displacement weight method, resistivity method, core in research rock core at present
Magnetic resonance test experience and CT imaging experiment etc..After weight method exactly unloads rock core down from experimental provision, measurement weight becomes
Change and calculate fluid saturation, the method can not measure the water saturation in rock core in flow process in real time.Resistivity method can
To realize the on-line checking of core fluids saturation degree, but need to carry out aperture, measuring point number in core holding unit and core surface
It measures limited, and is influenced by rock core heterogeneity.Nuclear magnetic resonance and CT imaging are by equipment limit, it tends to be difficult in formation temperature and pressure
Follow-on test is carried out under the conditions of power, and reservoir and physicochemical characteristics of fluid and mobile water saturation can be with temperature, pressure change
And change, so if the actual formation condition that experiment condition is flowed with fluid differs greatly, just it is difficult to ensure experiment knot
Fruit it is scientific, accurate.Therefore, existing method is difficult to carry out real-time online to reservoir mobile water saturation during gas reservoir development
Accurate test and analysis.([1] Guo Shangping, Huang Yanzhang, Zhou Juan, wait the Beijing physical chemistry seepage flow microcosmic mechanism [M]: science goes out
Society, 1990. [2] Xu Xuan, Liu Xuewei, Yang Zhengming wait extra-low permeability sandstone large size to appear model single phase fluid flow characterization experiments [J]
Petroleum journal, 2012,33 (3): 453 458. [3] Hu Yong, Li Xi Zhe, Lu Xiangguo wait and contain in sandstone reservoirs failure recovery process
Water saturation changing rule [J] Petroleum finance, 2014,06:723-726.).
In summary, this field need to develop it is a kind of can carry out under formation conditions can each portion of real-time in-line testing rock core
The method of position moveable water water saturation.
Summary of the invention
It is needed in view of reality, the main purpose of the present invention is to provide rock core mobile water saturations under a kind of formation condition
The experimental method of on-line checking, the experimental method can carry out under formation conditions and can each position of real-time in-line testing rock core it is aqueous
Saturation degree.
To achieve the above object, the present invention provides rock core mobile water saturation online test method under a kind of formation condition,
It includes the following steps:
Step 1: by long cores to be measured under the conditions of drying and two kinds of fully saturated water flooding, being respectively put into rock core clamping
Stratum Temperature-pressure Conditions are arranged in device, carry out X-ray using X-ray scanning system and obtain each position X-ray of rock core along journey multi-point scanning
Radiation intensity curve R0And R1；
The core holding unit be tolerable stratum temperature and pressure and the material not absorbing X-ray made of rock core clamping
Device；
Step 2: being restored rock core to the original saturation state of reservoir using water flooding, under the Temperature-pressure Conditions of stratum, by step
Rapid 1 identical mode carries out X-ray along journey multi-point scanning to obtain each position X-ray radiation intensity curve R of rock core2；
Step 3: the resulting recovery of step 2 to the rock core after the original saturation state of reservoir is led under the Temperature-pressure Conditions of stratum
The mode for being pressurized gas drive water step by step is crossed to the rock core progress displacement test for adding confining pressure and is used after every grade of pressurization
The identical mode of step 1 carries out X-ray along journey multi-point scanning, obtains corresponding air water migration road after every grade of pressurization
Each position X-ray radiation intensity curve R of diameter3；
Step 4: utilizing the X-ray intensity curve R of the acquisition0、R1、R2And a plurality of curve R3, calculate by the following method
Obtain each position mobile water saturation value of reservoir air water dust trajectory:
Formula S is pressed firstR2=Ln (R2/R0)/Ln(R1/R0) calculate intensity curve R2The corresponding water saturation in each position
SR2, then press formula SR3=Ln (R3/R0)/Ln(R1/R0) calculate R after every grade of pressurization3Each position is corresponding aqueous
Saturation degree SR3, finally by SR2Subtract SR3Each position mobile water saturation value after up to every grade of pressurization；When using step by step
R at the end of pressurization gas drive mode is final3When, each position mobile water saturation value of end-state can be calculated to obtain.
The present invention has carried out gradually pressurization gas drive water and has tested and test its R3, be on the one hand conducive in this way really
Determine end-state, is only pressurized to step by step and does not produce water just and can know which pressure is end-state；On the other hand, according to practical need
It wants, can also calculate the mobile water saturation numerical value under intermediate different pressure differences, have more important meaning for research gas reservoir machine for producing water reason
Justice.
X-ray scanning system of the present invention may include that application No. is " 201710301101.6 ", invention names for China
A kind of X-ray scanning system referred to as in " method and device for detecting core fluids saturation degree ", by reference will herein
The content of the patent application is incorporated to.The X-ray scanning system generally comprises: X-ray scanning platform, radiographic source, ray generator,
Ray detector, can thoroughly X-ray rock core fastener (2), shielding protection system, stepper motor.
A specific embodiment as the aforementioned online test method of the present invention, it is preferable that in step 1, described to be measured
Long cores be rule piston-shaped rock core.The cross-sectional diameter of the more preferable piston-shaped rock core is 2.5cm~3.8cm, length
Degree is 5cm to 100cm.
A specific embodiment as the aforementioned online test method of the present invention, it is preferable that the core holding unit is by titanium
Alloy material is made.It is highly preferred that the core holding unit can feel bad the pressure and 150 DEG C of temperature of 90MPa.
It is of the present invention to refer to that X-ray scanning system is moved along long cores along journey multi-point scanning, it is carried out in moving process more
Spot scan obtains each position X-ray radiation intensity of rock core.Preferably, the minimum step of the X-ray scanning system is 0.1mm,
Position precision is 0.1mm, and scanning speed is 0.1~10mm/s.Under maximum sweep rate, scanning 100cm length rock core only consumes
When 100s.
Stratum Temperature-pressure Conditions of the present invention refer to the pore pressure, confining pressure and experimental temperature of rock core and stratum in experimentation
Under the conditions of relevant parameter it is identical.These design parameters under formation condition can be obtained by practical oil-gas reservoir data, can also be led to
Cross empirical equation calculating.As rock core confining pressure size can refer to the overburden pressure P that rock core is born under formation conditionsOB, described
Overburden pressure POBValue calculated by depth of stratum h locating for rock sample:
POB=ρ × g × h/1000
POB--- overburden pressure, unit are megapascal；
ρ --- overlying rock is averaged rock density, and unit is gram/cc；
G --- acceleration of gravity, unit be ox/kilogram；
H --- depth in the middle part of sampling layer, unit is rice.
It is of the present invention to restore rock core to the original saturation state of reservoir to refer to due to gas reservoir under the conditions of prime stratum
There is certain initial water saturation, it is according to research needs, rock core is actually original aqueous full with stratum water saturation to Gas Reservoir
And angle value.It can make to reach original water saturation inside rock core by the way that the both ends of rock core are immersed in the water Absorb Water respectively；It can also
By way of vacuumizing, after making the fully saturated water of rock core, using high pressure gas drive or heating method, reach original containing water saturation
Degree.
Preferably, the gas of displacement is aqueous moisture in the mode for being pressurized gas drive water step by step.It is highly preferred that institute
Stating aqueous moisture is by obtaining after the gas of displacement is first passed through aqueous intermediate receptacle.
A specific embodiment as aforementioned online test method of the invention, it is preferable that described to be pressurized gas drive step by step
The mode of water includes: the initial gas drive pressure of setting, carries out gas drive；After rock core is no longer discharged and throughput stablizes, improve step by step
Gas drive pressure carries out repeating gas drive；When not flowing to setting displacement pressure or rock core air water, experiment terminates.
The features and advantages of the invention are: the present invention provides rock core mobile water saturation on-line checking sides under formation condition
Method can be swept during fluid flow experiment using matched with the X-ray multi-measuring point mobile water saturation of continuous moving
It retouches system and real-time online detection is carried out to each position mobile water saturation of dust trajectory.The original aqueous X of gas reservoir is obtained by test
X-ray radiation intensity curve in x ray intensity x and gas drive water experimentation under different displacement pressures, is calculated two kinds
Water saturation under state is commented to carry out quantization to reservoir moveable water changing rule during gas reservoir development and distribution characteristics
Valence, to study mobile water saturation changing rule, multiphase porous flow rule and oil-gas reservoir gas well produce the exploration and developments such as water rule neck
The mechanistic problem in domain provides technical support.
The present invention is for water flooding mobility in Study In Reservoir.Fluid flow experiment can be carried out under formation conditions, passed through
Each position water saturation of real-time in-line testing rock core, reflects mobile water saturation changing rule.This technology stores up evaluation
Layer mobile water saturation, research multiphase porous flow, reservoir gas-bearing property, oil-gas reservoir production water rule etc. are significant.
Detailed description of the invention
Fig. 1 is the flow chart of rock core mobile water saturation online test method under formation condition in the embodiment of the present invention 1；
Fig. 2 is displacement test block diagram in reservoir moveable water test method a kind of in the embodiment of the present invention 1；
Fig. 3 is a kind of experimental curve diagram that the test of reservoir moveable water test method obtains in the embodiment of the present invention 1, it is shown that
Each position water saturation of air water dust trajectory under different step.
Specific embodiment
It below in conjunction with figure and specific embodiment, elaborates to technical solution of the present invention, it should be understood that these implementations
Example is only illustrative of the invention and is not intended to limit the scope of the invention, after the present invention has been read, those skilled in the art
The modification of various equivalent forms of the invention is each fallen within the scope of the application.
Embodiment 1
The present embodiment provides rock core mobile water saturation online test methods under a kind of formation condition, can simulate and survey
As strata pressure declines during runin hair, the mistake of caused reservoir pore space water dynamic change after gas phase driving pressure increase
Journey, can be used for studying mobile water saturation changing rule, and multiphase porous flow rule and oil-gas reservoir gas well produce water rule etc..
Referring to FIG. 1, it is rock core mobile water saturation online test method flow chart under the present embodiment formation condition,
Include the following steps:
S1: drilling through sandstone rock sample from 8 sections of Sulige gas field, Ordos Basin box, and sample porosity is 10.3%, infiltration
Rate 1.12mD, sample length 5.37cm, diameter 3.8cm.After rock core drying will be tested, it is put into core holding unit, is restored to ground
Layer Temperature-pressure Conditions carry out X-ray using X-ray scanning system and obtain each position X-ray radiation intensity of rock core along journey multi-point scanning
Curve R0；
S2: after the fully saturated water of rock core will be tested using water flooding, it is put into core holding unit, is restored to stratum temperature and pressure item
Part carries out X-ray using the identical mode of step 1 and obtains each position X-ray radiation intensity curve R of rock core along journey multi-point scanning1；
S3: being restored rock core is tested to the original water saturation 38% of reservoir using water flooding, be put into core holding unit,
Restore to stratum Temperature-pressure Conditions, X-ray is carried out using the identical mode of step 1 and is penetrated along journey multi-point scanning acquisition each position X of rock core
Beta radiation intensity curve R2；
S4: under the Temperature-pressure Conditions of stratum, carrying out pressurization gas drive water experiment step by step, in every grade of pressurization and final aqueous
It is each along a plurality of corresponding air water dust trajectory of journey multi-point scanning experiment acquisition that state uses the identical mode of step 1 to carry out X-ray
Position X-ray radiation intensity curve R3；
S5: the X-ray radiation intensity curve R of the acquisition is utilized0, R1, R2With multiple curve R3, count by the following method
It calculates and obtains each position mobile water saturation value of reservoir air water dust trajectory:
Formula S is pressed firstR2=Ln (R2/R0)/Ln(R1/R0) calculate the corresponding water saturation in each position intensity curve R2
SR2, then press formula SR3=Ln (R3/R0)/Ln(R1/R0) calculate each position final saturation state intensity curve R3 it is corresponding aqueous
Saturation degree SR3, finally by SR2Subtract SR3Up to each position mobile water saturation value.
Rock core should be pre-processed according to standard GB/T/T 29172-2012 " core analysis method " before the test
And testing rock core basic parameter.Specific experimentation are as follows:
S1: after experiment rock core drying, it is put into special core holding unit, restores to stratum Temperature-pressure Conditions, carries out X-ray
Each position X-ray radiation intensity curve R of rock core is obtained along journey multi-point scanning0；
It is described to refer to experiment rock core drying in the baking oven that rock sample is placed in 100 DEG C in above-mentioned steps S1, continuous drying 48
Hour, to scan the X-ray radiation intensity curve R for obtaining dry rock core0。
In above-mentioned steps S1, the experiment rock core is the piston-shaped rock core of rule, and the diameter of rock core is 3.8cm, and length is
5.37cm。
In above-mentioned steps S1, the core holding unit is made of titanium alloy material.It does not absorb X-ray, X-ray transparent
Core holding unit by core holding unit without being absorbed.The core holding unit has high pressure resistant and hot properties, is resistant to maximal pressure
Power 90MPa, 150 DEG C of maximum temperature.
In above-mentioned steps S1, the stratum Temperature-pressure Conditions refer to the pore pressure, confining pressure of rock core and experiment temperature in experimentation
It spends identical as formation condition relevant parameter.In the present embodiment, pore pressure is 30MPa under formation condition, confining pressure is 80MPa and reality
Testing temperature is 80 DEG C, and design parameter can be obtained by practical oil-gas reservoir data, can also be calculated by empirical equation.As rock core encloses
The overburden pressure P that pressure size is born under formation conditions referring to rock coreOB, the overburden pressure POBValue pass through rock
Depth of stratum h locating for sample is calculated:
POB=ρ × g × h/1000
POB--- overburden pressure, unit are megapascal；
ρ --- overlying rock is averaged rock density, and unit is gram/cc；
G --- acceleration of gravity, unit be ox/kilogram；
H --- depth in the middle part of sampling layer, unit is rice.
Therefore, the present embodiment stratum Temperature-pressure Conditions be pore pressure be 30MPa, confining pressure is 80MPa and experimental temperature is 80
℃。
In above-mentioned steps, the X-ray scanning system used is X-ray scanning system disclosed in CN201710301101.6
System comprising: X-ray scanning platform, radiographic source, ray generator, ray detector, can thoroughly X-ray rock core fastener (2),
Shielding protection system, stepper motor.Its measuring principle be a certain radiation intensity is calculated according to attenuation law corresponding to
Fluid saturation.Saturation degree formula are as follows:
Sf1=Ln (Rx/Rf2)/Ln(Rf1/Rf2), Sf2=1-Sf1。
Wherein: SF1: fluid f1 saturation degree；Rx: the radiation intensity value under certain saturation degree；Rf2: when 100% saturation fluid f2
Radiation intensity value；Rf1: radiation intensity value when 100% saturation fluid F1.Fluid f1 is water flooding in this example, and f2 is nitrogen, Rf1
Radiation intensity value R when water flooding fully saturated for rock core1, Rf2For the radiation intensity value R under rock core oven-dried condition0。
Refer to that X-ray scanning system is moved along long cores along journey multi-point scanning in S1, multi-point scanning is carried out in moving process
Obtain each position X-ray radiation intensity of rock core.The minimum step of X-ray scanning system: 0.1mm, position precision: 0.1mm, scanning
Speed: 0.1~10mm/s.
S2: after the fully saturated water of rock core will be tested, it is put into core holding unit, is restored to stratum Temperature-pressure Conditions, using step 1
Identical mode carries out X-ray and obtains each position X-ray radiation intensity curve R of rock core along journey multi-point scanning1；
It is described that rock sample is saturated in above-mentioned steps S2, refer to for the rock core after drying to be put into evacuator and take out very
Sky is saturated rock sample using required fluid after vacuum degree reaches certain value, after rock sample is totally submerged in a liquid, continues
It vacuumizes 30 minutes to 1 hour, pressurization saturation can be carried out when necessary.
S3: experiment rock core is restored to the original saturation state of reservoir, core holding unit is put into, is restored to stratum temperature and pressure item
Part carries out X-ray using the identical mode of step 1 and obtains each position X-ray radiation intensity curve R of rock core along journey multi-point scanning2；
In above-mentioned steps S3, the rock core restores to the original saturation state of reservoir to refer to since gas reservoir is in prime stratum condition
Under have certain initial water saturation, according to research needs, contain rock core stratum water saturation to Gas Reservoir is actually original
Water saturation angle value 38%.
Rock core initial water saturation is established in S3, and there are two types of methods: by being immersed in the water at the both ends of the rock core respectively
Absorb Water makes to reach target water saturation inside rock core；Or by way of vacuumizing, make the fully saturated water of the rock core
Afterwards, using high pressure gas drive or heating method, reach target water saturation.High pressure gas drive is used in the present embodiment specific implementation
Method reach target water saturation.
S4: under the Temperature-pressure Conditions of stratum, carry out pressurization gas drive water experiment step by step, using step after every grade of pressurization
Rapid 1 identical mode carries out X-ray and tests along journey multi-point scanning, obtains each position X-ray radiation of corresponding air water dust trajectory
Intensity curve R3；
In above-mentioned steps S4, displacement test specifically comprises the following steps in the reservoir pore space water mobility test method
(refering to Fig. 2):
S41: setting initial gas drive pressure, carries out gas drive；
S42: after rock core is no longer discharged and throughput stablizes, gas drive pressure is improved, carries out gas drive；
S43: repeating the process of the S42, until when design highest displacement pressure or rock core air water do not flow, experiment knot
Beam.
In above-mentioned steps S4, the gas of displacement is aqueous moisture in the gas drive water mode, by by the gas of displacement
Body is first passed through be filled with water intermediate receptacle after be passed through in rock core again.The i.e. described gas drive water mode uses moisture, passes through the side being pressurized step by step
Formula carries out gas drive water experiment with rock core to experiment.
In above-mentioned steps S4, the gas drive of pressurization step by step simulates produced on-site pressure difference dynamic change and causes air water migration dynamic
The process of power enhancing.
It is described that gas drive is carried out using moisture in above-mentioned steps S4, lean-gas drive can be reduced in the process to the air-dried work of rock core
With can preferably measure the water saturation of rock core.According to lean-gas drive, the water saturation of the rock core can be in gas drive
One lands vertically low under drying function, the rock core water containing saturability that measures and actually has relatively large deviation, cannot reflect moveable water completely
Saturation degree feature.
In above-mentioned steps S4, the mode for being pressurized gas drive step by step refers to gas drive pressure by low pressure, in low pressure gas
Throughput is stable during drive and rock core be no longer discharged after or the obtained X-ray R of 3 hour lateral probe movements do not change
Afterwards, pressure is successively improved.Gas drive pressure in experimentation generally since 0.01 megapascal, is promoted to 0.05 from low to high step by step
Megapascal, 0.1 megapascal, 0.2 megapascal are real after the maximum displacement pressure or throughput that reach design are stable and rock core is no longer discharged
Test end.
S5: the X-ray radiation intensity curve R of the acquisition is utilized0, R1, R2With multiple curve R3, obtained by formula as described above
Obtain reservoir mobile water saturation.
Formula S is pressed firstR2=Ln (R2/R0)/Ln(R1/R0) calculate intensity curve R2The corresponding water saturation in each position
SR2, then press formula SR3=Ln (R3/R0)/Ln(R1/R0) calculate R after every grade of pressurization3Each position is corresponding aqueous
Saturation degree SR3, finally by SR2Subtract SR3Each position mobile water saturation value after up to every grade of pressurization；Described in use
R at the end of pressurization gas drive mode is final step by step3When, each position mobile water saturation value of end-state can be calculated to obtain.
In above-mentioned steps 5, the reservoir mobile water saturation refer to oil gas field at hiding and development process in, in reservoir
Water will migrate with the injection or output of oil gas.Due to reservoir properties difference and the difference of displacement power size, cause
Part water is flowable in rock core, and part water is not flowable, by can be with flowing water under certain displacement power or mining conditions
Saturation degree is known as reservoir mobile water saturation.
In above-mentioned steps 5, corresponding to the formula refers to and calculates a certain radiation intensity according to attenuation law
Fluid saturation.Calculation formula formula referring to described in S1 obtains.Mobile water saturation is the strong of the original saturation state of reservoir
Write music line R2With the intensity curve R for representing reservoir saturation state after every grade of pressurization3It is aqueous under corresponding two states
Saturation degree difference.As the R using the gas drive mode of pressurization step by step at the end of final3When, each position of end-state can be calculated to obtain
Mobile water saturation value.
Rock core mobile water saturation online test method under formation condition of the present invention, in fluid flow experiment process
In, it can be with the X-ray multi-measuring point mobile water saturation scanning means of continuous moving to each portion of dust trajectory using matched
Position mobile water saturation carries out real-time online detection, obtains water saturation value and distribution, can be used for studying mobile water saturation
Changing rule, multiphase porous flow rule and gas well produce water rule etc..
Referring to Fig. 3, it is using a kind of experimental curve diagram that the test of reservoir moveable water test method obtains of the present invention, figure
Middle curve is the different conditions different location water saturation obtained using above-mentioned reservoir moveable water test method.Wherein abscissa
Indicate the corresponding rock core position of scanning measuring point, ordinate is indicated according to the water saturation obtained after different location signal processing.
As the R using the gas drive mode of pressurization step by step at the end of final3When, mobile water saturation, which is that reservoir is original, to be contained
The intensity curve R of water state2With the intensity curve R for representing the final saturation state of reservoir at the end of final experiment3Corresponding two kinds of shapes
Saturation degree difference under state.It is respectively original water saturation curve (R in Fig. 32) and experiment at the end of saturation curves (R3)
The mobile water saturation at each position on reservoir air water dust trajectory during gas reservoir development can be calculated according to curve for difference
Value.
Claims (11)
1. rock core mobile water saturation online test method under a kind of formation condition comprising following steps:
Step 1: by long cores to be measured under the conditions of drying and two kinds of fully saturated water flooding, it is respectively put into core holding unit, if
Stratum Temperature-pressure Conditions are set, X-ray scanning system is used to carry out X-ray along journey multi-point scanning to obtain each position X-ray spoke of rock core
Penetrate intensity curve R0And R1；
The core holding unit be tolerable stratum temperature and pressure and the material not absorbing X-ray made of core holding unit；
Step 2: being restored rock core to the original water saturation of reservoir using water flooding, under the Temperature-pressure Conditions of stratum, by step 1
Identical mode carries out X-ray and tests along journey multi-point scanning to obtain each position X-ray radiation intensity curve R of rock core2；
Step 3: restore step 2 is resulting to the rock core after the original saturation state of reservoir, under the Temperature-pressure Conditions of stratum, by by
The mode of grade pressurization gas drive water carries out displacement test to the rock core for adding confining pressure, and uses and step after every grade of pressurization
Rapid 1 identical mode carries out X-ray along journey multi-point scanning, to obtain each position X-ray under a plurality of corresponding air water dust trajectory
Radiation intensity curve R3；
Step 4: utilizing the X-ray intensity curve R obtained0、R1、R2And a plurality of curve R3, calculate obtain reservoir by the following method
Each position mobile water saturation value of air water dust trajectory:
Formula S is pressed firstR2=Ln (R2/R0)/Ln(R1/R0) the corresponding water saturation SR2 in each position intensity curve R2 is calculated,
Then formula S is pressedR3=Ln (R3/R0)/Ln(R1/R0) calculate after every grade of pressurization each position it is corresponding contain water saturation
Spend SR3, finally by SR2Subtract SR3Up to each position mobile water saturation value after every grade of pressurization；
As the R using pressurization gas drive mode step by step at the end of final3When, each position mobile water saturation of end-state can be calculated to obtain
Value.
2. rock core mobile water saturation online test method under formation condition according to claim 1, wherein in step 1
In, the long cores to be measured are the piston-shaped rock core of rule.
3. rock core mobile water saturation online test method under formation condition according to claim 2, wherein the piston-shaped
The cross-sectional diameter of rock core is 2.5cm~3.8cm, and the length is 5cm to 100cm.
4. rock core mobile water saturation online test method under formation condition according to claim 1, wherein the rock core
Clamper is made of titanium alloy material.
5. rock core mobile water saturation online test method under formation condition according to claim 4, wherein rock core folder
Holder can tolerate the pressure and 150 DEG C of temperature of 90MPa.
6. rock core mobile water saturation online test method under formation condition according to claim 1, wherein the X is penetrated
The minimum step of linear scanning system is 0.1mm, and position precision 0.1mm, scanning speed is 0.1~10mm/s.
7. rock core mobile water saturation online test method under formation condition according to claim 1, wherein the use
Rock core is restored to the original water saturation of reservoir to be that the both ends of rock core are immersed in the water Absorb Water respectively by water flooding, is made in rock core
Portion reaches original water saturation.
8. rock core mobile water saturation online test method under formation condition according to claim 1, wherein the use
Water flooding restores rock core to be to make the fully saturated water flooding of rock core by way of vacuumizing to the original water saturation of reservoir
Afterwards, using high pressure gas drive or heating method, reach original water saturation.
9. rock core mobile water saturation online test method under formation condition according to claim 1, wherein step 3 institute
The gas for stating displacement in the mode for being pressurized gas drive water step by step is aqueous moisture.
10. rock core mobile water saturation online test method under formation condition according to claim 9, wherein described to contain
Water-wet gas is by obtaining after the gas of displacement is first passed through aqueous intermediate receptacle.
11. rock core mobile water saturation online test method under formation condition described according to claim 1~any one of 10,
Wherein, the mode for being pressurized gas drive water step by step includes: the initial gas drive pressure of setting, carries out gas drive；No longer be discharged when rock core and
After throughput is stablized, gas drive pressure is improved step by step, carries out repeating gas drive；It is not flowed to setting displacement pressure or rock core air water
When dynamic, experiment terminates.
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