CN107807078A - 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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- 239000011435 rock Substances 0.000 title claims abstract description 128
- 238000001514 detection method Methods 0.000 title abstract description 4
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- 238000002474 experimental method Methods 0.000 claims abstract description 25
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- 238000006073 displacement reaction Methods 0.000 claims abstract description 21
- 238000012360 testing method Methods 0.000 claims abstract description 20
- 238000010998 test method Methods 0.000 claims description 25
- 239000000428 dust Substances 0.000 claims description 11
- 229920006395 saturated elastomer Polymers 0.000 claims description 8
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- 238000010438 heat treatment Methods 0.000 claims description 3
- 238000011084 recovery Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 2
- 239000012530 fluid Substances 0.000 abstract description 18
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- 238000013508 migration Methods 0.000 abstract description 3
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- 238000009738 saturating Methods 0.000 abstract 1
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- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
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- G01N23/02—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material
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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
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N2015/0846—Investigating permeability, pore-volume, or surface area of porous materials by use of radiation, e.g. transmitted or reflected light
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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 be used in the formation conditionAnd (3) developing a fluid flow experiment, and reflecting the change rule of the movable water saturation by testing the water saturation of each part of the rock core on line in real time.
Description
Technical field
It is modeled to hide the experimental technique with exploitation, specifically a kind of stratum bar the present invention relates to oil exploration and exploitation field
Fluid can carry out real-time on-line detecting method when rock core is migrated to each position mobile water saturation of dust trajectory under part.
Background technology
In oil gas field into hiding with development process, the water in reservoir will migrate with the injection or output of oil gas.But
It is due to the difference of reservoir properties difference and displacement power size, causes that part water in rock core is flowable, and 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 experiments 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 perforate, measuring point number in core holding unit and core surface
Measure limited, and influenceed by rock core anisotropism.Nuclear magnetic resonance and CT imagings 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 can be with temperature, pressure change with physicochemical characteristics of fluid and mobile water saturation
And change, so if experiment condition and the actual formation condition difference of flow of fluid are larger, just it is difficult to ensure that experiment knot
It is the science of fruit, 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 physical chemistry seepage flow microcosmic mechanism [M] Beijing:Science goes out
Society, 1990. [2] Xu Xuan, Liu Xuewei, Yang Zhengming, wait large-scale model single phase fluid flow characterization experiments [J] that appears of extra-low permeability sandstone
Petroleum journal, 2012,33 (3)：453 458. [3] Hu Yong, Li Xi Zhe, Lu Xiangguo, wait and contain in sandstone reservoirs exhaustion recovery process
Water saturation changing rule [J] Petroleum finances, 2014,06:723-726.).
In summary, this area need badly exploitation 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.
The content of the invention
Needed in view of reality, it is a primary object of the present invention to provide rock core mobile water saturation 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 comprises the following steps：
Step 1：Long cores to be measured are being dried and under the conditions of fully saturated two kinds of stratum water, are being respectively put into rock core clamping
Device, stratum Temperature-pressure Conditions are set, carry out X ray using X-ray scanning system obtains 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 rock core clamps made of not absorbing the material of X ray
Device；
Step 2：Rock core is recovered to the original saturation state of reservoir using stratum water, 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：By the rock core after recovery to the original saturation state of reservoir obtained by step 2, under the Temperature-pressure Conditions of stratum, lead to
The rock core for crossing the mode pair plus confined pressure that are pressurized gas drive water step by step carries out displacement test and used after every grade of pressurization terminates
Step 1 identical mode carries out X ray along journey multi-point scanning, obtains the corresponding air water migration road after every grade of pressurization terminates
Each position X-ray radiation intensity curve R in footpath3；
Step 4：Utilize 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 R2Water saturation corresponding to each position
SR2, then by formula SR3=Ln (R3/R0)/Ln(R1/R0) calculate the R after every grade of pressurization terminates3It is aqueous corresponding to each position
Saturation degree SR3, finally by SR2Subtract SR3Produce every grade of pressurization and terminate rear each position mobile water saturation value；When using step by step
R at the end of supercharging 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 gradual supercharging gas drive water and has tested and test its R3, be on the one hand advantageous in this way really
Determine end-state, be only pressurized to step by step and do not produce water and just can know which pressure is end-state；On the other hand, according to actual need
Will, the mobile water saturation numerical value under middle different pressure differences can be also calculated, it has more important meaning for research gas reservoir machine for producing water reason
Justice.
X-ray scanning system of the present invention may include Chinese Application No. " 201710301101.6 ", invention name
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 X ray rock core fastener (2), shielding protection system, stepper motor thoroughly.
An embodiment as the foregoing online test method of the present invention, it is preferable that in step 1, described to be measured
Long cores for rule piston-shaped rock core.More preferably the cross-sectional diameter of the piston-shaped rock core is 2.5cm~3.8cm, and it is grown
Spend for 5cm to 100cm.
An embodiment as the foregoing 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 90MPa pressure and 150 DEG C of temperature.
It is of the present invention to refer to that X-ray scanning system moves along long cores along journey multi-point scanning, 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,
Positional precision is 0.1mm, and sweep speed is 0.1~10mm/s.Under maximum sweep rate, scanning 100cm length rock cores only consume
When 100s.
Stratum Temperature-pressure Conditions of the present invention refer to the pore pressure of rock core, confined pressure and experimental temperature and stratum in experimentation
Under the conditions of relevant parameter it is identical.These design parameters under formation condition can be obtained by actual oil-gas reservoir data, can also be led to
Cross empirical equation calculating.As rock core confined pressure size can refer to the overburden pressure P that rock core bears under formation conditionsOB, it is described
Overburden pressure POBValue calculated by depth of stratum h residing for rock sample：
POB=ρ × g × h/1000
POB--- overburden pressure, unit are MPa；
The average rock density of ρ --- overlying rock, unit are 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 by rock core recover to the original saturation state of reservoir 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 into Absorb Water respectively；Also may be used
By way of vacuumizing, after making the fully saturated water of rock core, using high pressure gas drive or mode of heating, reach original and contain water saturation
Degree.
Preferably, it is aqueous moisture in the gas for being pressurized displacement in the mode of gas drive water step by step.It is highly preferred that institute
It is by being obtained after the gas of displacement is first passed through into aqueous intermediate receptacle to state aqueous moisture.
An embodiment as the foregoing online test method of the present invention, it is preferable that described to be pressurized gas drive step by step
The mode of water includes：Initial gas drive pressure is set, carries out gas drive；After rock core no longer water outlet and stable throughput, improve step by step
Gas drive pressure, carry out repeating gas drive；When not flowed to setting displacement pressure or rock core air water, experiment terminates.
The features and advantages of the invention are：The invention provides rock core mobile water saturation on-line checking side under formation condition
Method, it can be swept during fluid flow experiment using matched with the X ray multi-measuring point mobile water saturation of continuous moving
Retouch 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 testing
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, commented so as to carry out quantization to reservoir moveable water changing rule during gas reservoir development and distribution characteristics
Valency, to study mobile water saturation changing rule, the exploration and development neck such as multiphase porous flow rule and oil-gas reservoir gas well production water rule
Domain mechanism sex chromosome mosaicism provides technical support.
The present invention is used for stratum water 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 is stored up for evaluation
Layer mobile water saturation, research multiphase porous flow, reservoir gas-bearing property, oil-gas reservoir production water rule etc. is significant.
Brief description of the drawings
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 a kind of reservoir moveable water method of testing in the embodiment of the present invention 1；
Fig. 3 is the experimental curve diagram that a kind of reservoir moveable water method of testing test 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.
Embodiment
Below in conjunction with figure and specific embodiment, technical scheme is elaborated, 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
Modification to the various equivalent form of values of the present invention is each fallen within the range of the application.
Embodiment 1
The present embodiment provides rock core mobile water saturation online test method under a kind of formation condition, and it 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, available for research mobile water saturation changing rule, multiphase porous flow rule and oil-gas reservoir gas well production water rule etc..
Fig. 1 is refer to, it is rock core mobile water saturation online test method flow chart under the present embodiment formation condition, its
Comprise the following steps：
S1：From Sulige gas field, Ordos Basin box, 8 sections drill through sandstone rock sample, and sample porosity is 10.3%, infiltration
Rate 1.12mD, sample length 5.37cm, diameter 3.8cm.After rock core drying will be tested, core holding unit is put into, is recovered to ground
Layer Temperature-pressure Conditions, X ray is carried out using X-ray scanning system and obtains each position X-ray radiation intensity of rock core along journey multi-point scanning
Curve R0；
S2：After testing the fully saturated water of rock core using stratum water, core holding unit is put into, is recovered to stratum temperature and pressure bar
Part, X ray is carried out using step 1 identical mode and obtains each position X-ray radiation intensity curve R of rock core along journey multi-point scanning1；
S3：Recovered using stratum water by rock core is tested to the original water saturation 38% of reservoir, be put into core holding unit,
Recover to stratum Temperature-pressure Conditions, carry out X ray using step 1 identical mode penetrates 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, carry out and be pressurized the experiment of gas drive water step by step, it is in every grade of pressurization and final aqueous
State using step 1 identical mode carries out X ray, and along the experiment of journey multi-point scanning to obtain a plurality of corresponding air water dust trajectory each
Position X-ray radiation intensity curve R3；
S5：Utilize the X-ray radiation intensity curve R of the acquisition0, R1, R2With multiple curve R3, count by the following method
Calculate and 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 water saturation corresponding to each positions of intensity curve R2
SR2, then by formula SR3=Ln (R3/R0)/Ln(R1/R0) calculate it is aqueous corresponding to final each positions of saturation state intensity curve R3
Saturation degree SR3, finally by SR2Subtract SR3Produce each position mobile water saturation value.
Before the test should be according to standard GB/T/T 29172-2012《Core analysis method》, rock core is pre-processed
And testing rock core basic parameter.Specifically experimentation is：
S1：After rock core drying will be tested, special core holding unit is put into, recovers 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 rock sample being placed in 100 DEG C of baking oven by experiment rock core drying in above-mentioned steps S1, continuous drying 48
Hour, so as to scan the X-ray radiation intensity curve R for obtaining dry rock core0。
In above-mentioned steps S1, the rock core of testing is for regular piston-shaped rock core, a diameter of 3.8cm of rock core, length
5.37cm。
In above-mentioned steps S1, described core holding unit is made up 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 of rock core in experimentation, confined pressure and experiment temperature
Degree is identical with formation condition relevant parameter.In the present embodiment, under formation condition pore pressure be 30MPa, confined pressure be 80MPa and reality
Temperature is tested as 80 DEG C, design parameter can be obtained by actual oil-gas reservoir data, can also be calculated by empirical equation.As rock core encloses
The overburden pressure P that pressure size is born with reference to rock core under formation conditionsOB, the overburden pressure POBValue pass through rock
Depth of stratum h is calculated residing for sample：
POB=ρ × g × h/1000
POB--- overburden pressure, unit are MPa；
The average rock density of ρ --- overlying rock, unit are 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, confined pressure is 80MPa and experimental temperature is 80
℃。
In above-mentioned steps, the X-ray scanning system used is the X-ray scanning system disclosed in CN201710301101.6
System, it includes：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 is according to corresponding to attenuation law calculates a certain radiation intensity
Fluid saturation.Saturation degree formula is：
Sf1=Ln (Rx/Rf2)/Ln(Rf1/Rf2), Sf2=1-Sf1。
Wherein:SF1:Fluid f1 saturation degrees；Rx:Radiation intensity value under certain saturation degree；Rf2:During 100% saturation fluid f2
Radiation intensity value；Rf1:Radiation intensity value during 100% saturation fluid F1.Fluid f1 is stratum water in this example, and f2 is nitrogen, Rf1
Radiation intensity value R during stratum water fully saturated for rock core1, Rf2For the radiation intensity value R under rock core oven-dried condition0。
Refer to that X-ray scanning system moves 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, positional precision：0.1mm, scanning
Speed：0.1~10mm/s.
S2：After the fully saturated water of rock core will be tested, core holding unit is put into, is recovered 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 saturation is carried out to rock sample in above-mentioned steps S2, refer to the rock core after drying being put into evacuator and take out very
Sky, after vacuum reaches certain value, rock sample saturation is made using required fluid, after rock sample is totally submerged in a liquid, continued
Vacuumize 30 minutes to 1 hour, pressurization saturation can be carried out if necessary.
S3：Experiment rock core is recovered to the original saturation state of reservoir, core holding unit is put into, recovers to stratum temperature and pressure bar
Part, X ray is carried out using step 1 identical mode 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 recovers to the original saturation state of reservoir to refer to because 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 two methods：By the way that the both ends of the rock core are immersed in the water respectively
Absorb Water, make 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 mode of heating, target water saturation is reached.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 and be pressurized the experiment of gas drive water step by step, using step after every grade of pressurization terminates
Rapid 1 identical mode carries out X ray and tested 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 method of testing
(referring to Fig. 2)：
S41：Initial gas drive pressure is set, carries out gas drive；
S42：After rock core no longer water outlet and stable throughput, gas drive pressure is improved, carries out gas drive；
S43：The process of the S42 is repeated, when not flowed to design highest displacement pressure or rock core air water, 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 passed through in rock core again after being first passed through the intermediate receptacle that is filled with water.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 to experiment with rock core.
In above-mentioned steps S4, the gas drive of supercharging 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, it can reduce during lean-gas drive to the air-dried work of rock core
With can preferably determine the water saturation of rock core.According to lean-gas drive, the water saturation of the rock core can be in gas drive
Drying function is next to land vertically low, the rock core water containing saturability that measures and actually has relatively large deviation, it is impossible to reflect moveable water completely
Saturation degree feature.
In above-mentioned steps S4, the described mode for being pressurized gas drive step by step refers to gas drive pressure by low pressure, in low pressure gas
Throughput is stablized and after rock core no longer water outlet during drive, or the X ray R that 3 hour lateral probe movements obtain does not change
Afterwards, pressure is improved successively.Gas drive pressure in experimentation, from low to high, typically since 0.01 MPa, 0.05 is promoted to step by step
MPa, it is 0.1 MPa, 0.2 MPa, real after maximum displacement pressure or the throughput stabilization for reaching design and rock core no longer water outlet
Test end.
S5：Utilize the X-ray radiation intensity curve R of the acquisition0, 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 R2Water saturation corresponding to each position
SR2, then by formula SR3=Ln (R3/R0)/Ln(R1/R0) calculate the R after every grade of pressurization terminates3It is aqueous corresponding to each position
Saturation degree SR3, finally by SR2Subtract SR3Produce every grade of pressurization and terminate rear each position mobile water saturation value；When described in use
R at the end of supercharging 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, described reservoir mobile water saturation refer to oil gas field into hide and development process in, in reservoir
Water will be migrated 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 the water that can be flowed under certain displacement power or mining conditions
Saturation degree is referred to as reservoir mobile water saturation.
In above-mentioned steps 5, described formula refers to according to corresponding to attenuation law calculates a certain radiation intensity
Fluid saturation.Formula of the calculation formula with reference to described in S1 obtains.Mobile water saturation is the strong of the original saturation state of reservoir
Write music line R2The intensity curve R of reservoir saturation state is represented after terminating with every grade of pressurization3It is aqueous under corresponding two states
Saturation degree difference.R at the end of supercharging gas drive mode is final step by step described in using3When, 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, 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, available for studying mobile water saturation
Changing rule, multiphase porous flow rule and gas well production water rule etc..
Referring to Fig. 3, it is the experimental curve diagram obtained using a kind of reservoir moveable water method of testing test of the present invention, figure
Middle curve is the different conditions diverse location water saturation obtained using above-mentioned reservoir moveable water method of testing.Wherein abscissa
Rock core position corresponding to scanning measuring point is represented, ordinate is represented according to the water saturation obtained after diverse location signal transacting.
R at the end of supercharging gas drive mode is final step by step described in using3When, mobile water saturation, which is that reservoir is original, to be contained
The intensity curve R of water state2Terminate the intensity curve R of the final saturation state of interval scale reservoir with 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)
Difference, the mobile water saturation at each position on reservoir air water dust trajectory during gas reservoir development can be calculated according to curve
Value.
Claims (11)
1. rock core mobile water saturation online test method under a kind of formation condition, it comprises the following steps：
Step 1：Long cores to be measured are being dried with the conditions of fully saturated two kinds of stratum water, are being respectively put into core holding unit, if
Stratum Temperature-pressure Conditions are put, use X-ray scanning system 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 core holding unit made of not absorbing the material of X ray；
Step 2：Rock core is recovered to the original water saturation of reservoir using stratum water, under the Temperature-pressure Conditions of stratum, by step 1
Identical mode carries out X ray and tested along journey multi-point scanning to obtain each position X-ray radiation intensity curve R of rock core2；
Step 3：By the rock core after recovery to the original saturation state of reservoir obtained by step 2, under the Temperature-pressure Conditions of stratum, by by
The mode pair of level supercharging gas drive water plus the rock core of confined pressure carry out displacement test, and step is used after every grade of pressurization terminates
1 identical mode carries out X ray along journey multi-point scanning, to obtain each position X-ray radiation of a plurality of corresponding air water dust trajectory
Intensity curve R3；
Step 4：Utilize the X-ray intensity curve R of the acquisition0、R1、R2And a plurality of curve R3, calculate obtain by the following method
Each position mobile water saturation value of reservoir air water dust trajectory：
Formula S is pressed firstR2=Ln (R2/R0)/Ln(R1/R0) calculate water saturation S corresponding to each positions of intensity curve R2R2, so
Formula S is pressed afterwardsR3=Ln (R3/R0)/Ln(R1/R0) calculate the water saturation corresponding to each position after every grade of pressurization terminates
SR3, finally by SR2Subtract SR3Produce each position mobile water saturation value after every grade of pressurization terminates；
As the R using supercharging 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 regular piston-shaped rock core.
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 its 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 up 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 feel bad 90MPa pressure and 150 DEG C of temperature.
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 positional precision 0.1mm, sweep 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
It is that the both ends of rock core are immersed in the water into Absorb Water respectively that stratum water, which recovers rock core to the original water saturation of reservoir, 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
It is by way of vacuumizing that stratum water, which recovers rock core to the original water saturation of reservoir, after making the fully saturated water of rock core, is adopted
With high pressure gas drive or mode of heating, 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 of supercharging 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, it is described to contain
Water moisture is by being obtained after the gas of displacement is first passed through into aqueous intermediate receptacle.
11. according to rock core mobile water saturation online test method under formation condition according to any one of claims 1 to 10,
Wherein, the mode for being pressurized gas drive water step by step includes：Initial gas drive pressure is set, carries out gas drive；When rock core no longer water outlet and
After throughput is stable, gas drive pressure is improved step by step, carries out repeating gas drive；Do not flowed to setting displacement pressure or rock core air water
When dynamic, experiment terminates.
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