CN103334725A - Method and device for evaluating low permeability reservoir displacement effectiveness - Google Patents
Method and device for evaluating low permeability reservoir displacement effectiveness Download PDFInfo
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- CN103334725A CN103334725A CN2013102618080A CN201310261808A CN103334725A CN 103334725 A CN103334725 A CN 103334725A CN 2013102618080 A CN2013102618080 A CN 2013102618080A CN 201310261808 A CN201310261808 A CN 201310261808A CN 103334725 A CN103334725 A CN 103334725A
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Abstract
The invention relates to the field of the development of oil reservoir, and in particular to a method and a device for evaluating low permeability reservoir displacement effectiveness. The method comprises the following steps of selecting a core to carry out the displacement, and acquiring an energy curve of the core reflecting the variation of an energy retention coefficient along the time, wherein the energy retention coefficient is the pressure retention state of the core in the displacement process; and evaluating the displacement effectiveness through the variation of the energy curve. By measuring the pressure on different points of the core, the temperature and pressure condition of the low permeability reservoir can be simulated, and the low permeability reservoir energy retention coefficient test method is obtained. Whether an effective displacement system can be established or not can be evaluated by utilizing the energy retention coefficient. Important significance in the low permeability reservoir recovery field can be achieved.
Description
Technical field
The present invention relates to the oil reservoir development field, relate in particular to a kind of method and device of estimating low-permeability oil deposit displacement validity.
Background technology
Low-permeability oil deposit has become the important component part of producing in the China's oil increasing the storage, at present still insufficient to the level of understanding of low-permeability oil deposit, its seepage flow mechanism, movement disciplinarian of oil and water etc. all have a great difference with the saturating sandstone reservoir of general middle and high infiltration, the passage that the permeability of low-permeability oil deposit is very low, oil gas water is depended on for existence is very trickle, filtrational resistance is very big, the interaction force of liquid-solid boundary and liquid-liquid interface is remarkable, and cause percolation law to depart from Darcy's law, at present how low-permeability oil deposit is set up also ripe evaluation method without comparison of effective displacement system.
Summary of the invention
The embodiment of the invention provides a kind of method and device of estimating low-permeability oil deposit displacement validity, be used for to solve existing low-permeability oil deposit and how to set up also ripe evaluation method without comparison of effective displacement system.
A kind of method of estimating low-permeability oil deposit displacement validity is provided in the embodiment of the invention, comprises:
Choose rock core and carry out displacement, and obtain the energy retention coefficient of described rock core with the energy curve of displacement time variation; Described energy retention coefficient is the pressure hold mode of described rock core in displacement process;
By the variation of described energy curve, estimate the validity of this displacement.
Above-mentioned a kind of method of estimating low-permeability oil deposit displacement validity, wherein, described method also comprises:
When described energy curve increases progressively, then the energy of described displacement keeps high;
When described energy curve successively decreases, then the energy of described displacement keeps low.
Above-mentioned a kind of method of estimating low-permeability oil deposit displacement validity, wherein, the energy retention coefficient that obtains described rock core comprises:
Choose a plurality of pressure spots and real-time force value of gathering each pressure spot on the rock core;
Calculate the first integral area of each force value and length, calculate the second integral area of force value and the length of described rock core oil phase under the irreducible water condition simultaneously; Described length is that described pressure spot is to the distance of the injection end of described displacing medium;
Calculate the ratio of described first integral area and second integral area, obtain the energy retention coefficient of described rock core.
Above-mentioned a kind of method of estimating low-permeability oil deposit displacement validity, wherein, a plurality of described pressure spots evenly distribute along the seepage direction of described rock core.
Above-mentioned a kind of method of estimating low-permeability oil deposit displacement validity, wherein, described displacement comprises: miscible-phase displacement and immiscible displacement.
Above-mentioned a kind of method of estimating low-permeability oil deposit displacement validity, wherein, after adopting multiple displacing medium that described rock core is carried out displacement respectively, the displacement time to every kind of displacing medium is carried out normalized, obtains the time dependent energy curve of energy retention coefficient under every kind of displacing medium.
Above-mentioned a kind of method of estimating low-permeability oil deposit displacement validity, wherein, described rock core is the whole rock core of length 0.8m-1.5m.
The present invention also provides a kind of device of estimating low-permeability oil deposit displacement validity, and corresponding device comprises:
Acquiring unit is used for choosing rock core and carries out displacement, and obtains the energy retention coefficient of described rock core with the energy curve of displacement time variation; Described energy retention coefficient is the pressure hold mode of described rock core in displacement process;
Analytic unit is used for the variation by described energy curve, estimates the validity of this displacement.
Above-mentioned a kind of device of estimating low-permeability oil deposit displacement validity, wherein, described acquiring unit also comprises:
Acquisition module is used for choosing a plurality of pressure spots and real-time force value of gathering each pressure spot on the rock core;
Computing module for the first integral area that calculates each force value and length, calculates the second integral area of force value and the length of described rock core oil phase under the irreducible water condition simultaneously; Described length is that described pressure spot is to the distance of the injection end of described displacing medium;
Described computing unit also is used for calculating the ratio of described first integral area and second integral area, obtains the energy retention coefficient of described rock core.
Above-mentioned a kind of device of estimating low-permeability oil deposit displacement validity, wherein, described device also comprises: processing unit, be used for after adopting multiple displacing medium that described rock core is carried out displacement respectively, the displacement time to every kind of displacing medium is carried out normalized, by the time dependent energy curve of energy retention coefficient under every kind of displacing medium of described acquiring unit acquisition.
The embodiment of the invention provides, and by whole rock core is carried out the multiple spot pressure measurement, temperature, the pressure condition of simulation low-permeability oil deposit obtain low-permeability oil deposit energy retention coefficient method of testing.Utilize the energy retention coefficient to estimate to set up effective displacement system.Be significant in low-permeability oil deposit exploitation field.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, does not constitute limitation of the invention.In the accompanying drawings:
Fig. 1 is a kind of method flow diagram of estimating low-permeability oil deposit displacement validity in the embodiment of the invention;
Fig. 2 is a kind of device schematic diagram of estimating low-permeability oil deposit displacement validity in the embodiment of the invention;
Fig. 3 is that energy retention coefficient of the present invention calculates schematic diagram;
Fig. 4 is the energy curve schematic diagram of the different displacing mediums of the present invention correspondence in displacement process.
The specific embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing the embodiment of the invention is described in further detail.At this, illustrative examples of the present invention and explanation thereof are used for explanation the present invention, but not as a limitation of the invention.
The embodiment of the invention provides a kind of method and device of estimating low-permeability oil deposit displacement validity, be used for to solve existing low-permeability oil deposit and how to set up also ripe evaluation method without comparison of effective displacement system.
A kind of method of estimating low-permeability oil deposit displacement validity is provided in the embodiment of the invention, and as shown in Figure 1, described method comprises:
The invention provides in a kind of method preferred embodiment of estimating low-permeability oil deposit displacement validity, described rock core is the whole rock core of length 0.8m-1.5m.
Preferable, in a kind of method of estimating low-permeability oil deposit displacement validity, the validity of estimating displacement comprises:
When described energy curve increases progressively, then the energy of described displacement keeps high;
When described energy curve successively decreases, then the energy of described displacement keeps low.
The embodiment of the invention is utilized whole rock core and many pressure taps rock core model system by the method for above-mentioned evaluation low-permeability oil deposit displacement validity, and temperature, the pressure condition of simulation low-permeability oil deposit obtain low-permeability oil deposit energy retention coefficient method of testing.Utilize the energy retention coefficient with the energy curve that the displacement time changes, can estimate and to set up effective displacement system.
A kind of method of estimating low-permeability oil deposit displacement validity that the embodiment of the invention provides, wherein, the energy retention coefficient that obtains described rock core comprises:
Choose a plurality of pressure spots and real-time force value of gathering each pressure spot on the rock core;
Calculate the first integral area of each force value and length, calculate the second integral area of force value and the length of described rock core oil phase under the irreducible water condition simultaneously; Described length is that described pressure spot is to the distance of the injection end of described displacing medium;
Calculate the ratio of described first integral area and second integral area, obtain the energy retention coefficient of described rock core.
Concrete, the length of supposing this rock core is L, calculates the pressure value P of each pressure measurement electricity of a certain this rock core of moment t earlier
t(x) and the pressure value P of this rock core oil phase under the irreducible water condition
OiAfter, try to achieve the pressure value P of each pressure measurement electricity
t(x) with the first integral area of length and the pressure value P of oil phase
OiWith the second integral area of length, the ratio of described first integral area and second integral area is the energy retention coefficient η of this rock core
p, namely
By above-mentioned identical computational methods, obtain different energy retention coefficients constantly, draw the energy retention coefficient with the energy curve that the displacement time changes, adopt the mode of above-described embodiment to estimate the validity of this displacement system at last.
Among the embodiment of above-mentioned a kind of method of estimating low-permeability oil deposit displacement validity, a plurality of described pressure spots evenly distribute along the seepage direction of described rock core.
A kind of method of estimating low-permeability oil deposit displacement validity that the embodiment of the invention provides, wherein, described displacement comprises: miscible-phase displacement and immiscible displacement.Concrete, the embodiment of the invention has not only adopted water drive but also adopted gas drive.
Above-mentioned a kind of method of estimating low-permeability oil deposit displacement validity, wherein, after adopting multiple displacing medium that described rock core is carried out displacement respectively, obtain the energy curve that different energy retention coefficients constantly changed with the displacement time, the displacement time to every kind of displacing medium is carried out normalized, obtains the time dependent energy curve of energy retention coefficient under every kind of displacing medium.Concrete, because miscible-phase displacement is under the prerequisite of same effect (identical oil saturation), the used time phase difference of different displacing mediums is very big, for the ease of contrast directly perceived, its time is carried out normalization, so use non dimensional time.
The embodiment of the invention is utilized the long rock core simulation system of whole rock core and many pressure taps rock core model, and temperature, the pressure condition of simulation low-permeability oil deposit obtain low-permeability oil deposit energy retention coefficient method of testing.Utilize the energy retention coefficient to estimate to set up effective displacement system.Be significant in low-permeability oil deposit exploitation field.
The embodiment of the invention also provides a kind of device of estimating low-permeability oil deposit displacement validity, and as shown in Figure 2, corresponding device comprises:
Acquiring unit 201 is used for choosing rock core and carries out displacement, and obtains the energy retention coefficient of described rock core with the energy curve of displacement time variation; Described energy retention coefficient is the pressure hold mode of described rock core in displacement process; Preferable, described rock core is chosen whole rock core, and chooses a plurality of pressure measurement electricity at described rock core, and temperature, the pressure condition of simulation infiltration oil reservoir, obtains low-permeability oil deposit energy retention coefficient method of testing.Wherein, concrete, the energy retention coefficient characterizes pressure maintenance level in the displacement process, discloses pressure transitivity and energy supplement validity.Concrete simulation test mode can adopt prior art, repeats no more in the embodiment of the invention.
The invention provides in a kind of device preferred embodiment of estimating low-permeability oil deposit displacement validity, described rock core is the whole rock core of length 0.8m-1.5m.
Concrete, adopting whole rock core and many pressure taps rock core model system, temperature, the pressure condition of simulation low-permeability oil deposit obtain low-permeability oil deposit energy retention coefficient.Utilize the energy retention coefficient with the energy curve that the displacement time changes, can estimate and to set up effective displacement system.
Above-mentioned a kind of device of estimating low-permeability oil deposit displacement validity, wherein, described acquiring unit also comprises:
Acquisition module is used for choosing a plurality of pressure spots and real-time force value of gathering each pressure spot on the rock core;
Computing module for the first integral area that calculates each force value and length, calculates the second integral area of force value and the length of described rock core oil phase under the irreducible water condition simultaneously; Described length is that described pressure spot is to the distance of the injection end of described displacing medium;
Described computing unit also is used for calculating the ratio of described first integral area and second integral area, obtains the energy retention coefficient of described rock core.
Above-mentioned a kind of device of estimating low-permeability oil deposit displacement validity, wherein, described device also comprises: processing unit, be used for after adopting multiple displacing medium that described rock core is carried out displacement respectively, the displacement time to every kind of displacing medium is carried out normalized, by the time dependent energy curve of energy retention coefficient under every kind of displacing medium of described acquiring unit acquisition.
The embodiment of the invention provides, and by whole rock core is carried out the multiple spot pressure measurement, temperature, the pressure condition of simulation low-permeability oil deposit obtain low-permeability oil deposit energy retention coefficient method of testing.Utilize the energy retention coefficient to estimate to set up effective displacement system.Be significant in low-permeability oil deposit exploitation field.
Do explanation in further detail below in conjunction with accompanying drawing 3,4 couples of the present invention.
Water drive embodiment one: the employing specification is that the integral body of 4.5cm * 4.5cm * 100cm does not have the butt joint hyposmosis long rock core of appearing, evenly arrange 9 pressure taps along seepage direction, be adjacent two pressure taps apart from 12.5cm, carry out pressure by pressure automatic acquisition device in the prior art and gather in real time.Long core simulation system inlet pressure is controlled by pump, the simulating oil deposit injection pressure, and outlet pressure is controlled by back-pressure valve, bottom hole flowing pressure in the simulation mining process, the experiment confined pressure is controlled to be 32MPa.
Long rock core perm-plug method is 1.96 * 10-3 μ m2, and degree of porosity is 13.8%, and the average pore radius is 1.234 μ m.The long celebrating of this experimental simulation oil field low-permeability oil deposit feature, formation water viscosity is 1mPa.s, and salinity is 10000mg/L, and Simulation of Crude Oil viscosity is 1mPa.s, and experimental procedure is as follows:
Step 11: the whole rock core that with length is 1m is dried 48h in 105 ℃ of insulating boxs;
Step 12: this rock core is put into the long rock core simulation system of many pressure taps rock core model, add confined pressure to 4MPa;
Step 13: with the long rock core simulation system of many pressure taps rock core model vacuumize 24 hours to the model rock core vacuum reach-0.1MPa, adopt pressurization with the slow saturated formation water of rock core, for reducing the stress sensitive effect, the clean effective stress of rock core is no more than 3MPa in the saturation history, finally make the formation water saturation pressure reach 25MPa, increase confined pressure again to 32MPa;
Step 14: use simulated oil to make irreducible water, constant voltage 7MPa, rock core outlet back pressure 5MPa, and improve displacement pressure gradually to 25MPa, reach 20 times of voids volumes up to saturated oil mass;
Step 15: carry out water drive oil, water drive pressure 25MPa, production end back pressure 5MPa gathers each the pressure tap pressure dynamic change of water drive oil process rock core diverse location in real time, metering extraction profit amount;
Step 16: utilize a certain moment t of displacement pressure value P
t(x) with length integral area and irreducible water condition under the pressure value P of oil phase
OiRatio calculating energy retention coefficient η with the length integral area
p, design formulas is:
The concrete schematic diagram that calculates is referring to Fig. 3.(t=0 represents under the irreducible water saturation among the figure, the pressure distribution when namely oil phase flows separately; T=t1 represents arbitrary moment pressure distribution situation of displacement; S1 represents displacement t1 moment force value and length gets integral area, the force value of oil phase and the integral area of length under S2 representative and the irreducible water condition.
N2 drives embodiment two: the employing specification is that the integral body of 4.5cm * 4.5cm * 100cm does not have the butt joint hyposmosis long rock core of appearing, evenly arrange 9 pressure taps along seepage direction, adjacent two pressure taps carry out pressure by the pressure automatic acquisition device and gather in real time apart from 12.5cm.Long core simulation system inlet pressure is controlled by pump, the simulating oil deposit injection pressure, and outlet pressure is controlled by back-pressure valve, bottom hole flowing pressure in the simulation mining process, the experiment confined pressure is controlled to be 32MPa.
Long rock core perm-plug method is 1.96 * 10-3 μ m2, and degree of porosity is 13.8%, and the average pore radius is 1.234 μ m.The long celebrating of this experimental simulation oil field low-permeability oil deposit feature, formation water viscosity is 1mPa.s, and salinity is 10000mg/L, and Simulation of Crude Oil viscosity is 1mPa.s, and experimental procedure is as follows:
Step 21: the whole rock core that with length is 1m is dried 48h in 105 ℃ of insulating boxs;
Step 22: this rock core is put into the long rock core simulation system of many pressure taps rock core model, add confined pressure 4MPa;
Step 23: with the long rock core simulation system of many pressure taps rock core model vacuumize 24 hours to the model rock core vacuum reach-0.1MPa, adopt pressurization with the slow saturated formation water of rock core, for reducing the stress sensitive effect, the clean effective stress of rock core is no more than 3MPa in the saturation history, finally make the formation water saturation pressure reach 25MPa, increase confined pressure again to 32MPa;
Step 24: use simulated oil to make irreducible water, constant voltage 7MPa, rock core outlet back pressure 5MPa, and improve displacement pressure gradually to 25MPa, reach 20 times of voids volumes up to saturated oil mass;
Step 25: carry out N
2The displacement of reservoir oil, water drive pressure 25MPa, production end back pressure 5MPa gathers N in real time
2Each the pressure tap pressure dynamic change of oil displacement process rock core diverse location, metering extraction oil, tolerance;
Step 26: utilize a certain moment t of displacement pressure value P
t(x) with length integral area and irreducible water condition under the pressure value P of oil phase
OiRatio calculating energy retention coefficient η with the length integral area
p, design formulas is:
The concrete schematic diagram that calculates is referring to Fig. 3.
CO
2Drive embodiment three: the employing specification is that the integral body of 4.5cm * 4.5cm * 100cm does not have the butt joint hyposmosis long rock core of appearing, and evenly arranges 9 pressure taps along seepage direction, and adjacent two pressure taps carry out pressure by the pressure automatic acquisition device and gather in real time apart from 12.5cm.Long core simulation system inlet pressure is controlled by pump, the simulating oil deposit injection pressure, and outlet pressure is controlled by back-pressure valve, bottom hole flowing pressure in the simulation mining process, the experiment confined pressure is controlled to be 32MPa.
Long rock core perm-plug method is 1.96 * 10-3 μ m2, and degree of porosity is 13.8%, and the average pore radius is 1.234 μ m.The long celebrating of this experimental simulation oil field low-permeability oil deposit feature, formation water viscosity is 1mPa.s, and salinity is 10000mg/L, and Simulation of Crude Oil viscosity is 1mPa.s, and experimental procedure is as follows:
Step 31: the whole rock core that with length is 1m is dried 48h in 105 ℃ of insulating boxs;
Step 32: this rock core is put into the long rock core simulation system of many pressure taps rock core model, add confined pressure 4MPa;
Step 33: with the long rock core simulation system of many pressure taps rock core model vacuumize 24 hours to the model rock core vacuum reach-0.1MPa, adopt pressurization with the slow saturated formation water of rock core, for reducing the stress sensitive effect, the clean effective stress of rock core is no more than 3MPa in the saturation history, finally make the formation water saturation pressure reach 25MPa, increase confined pressure again to 32MPa;
Step 34: use simulated oil to make irreducible water, constant voltage 7MPa, rock core outlet back pressure 5MPa, and improve displacement pressure gradually to 25MPa, reach 20 times of voids volumes up to saturated oil mass;
Step 35: carry out CO
2The displacement of reservoir oil, water drive pressure 25MPa, production end back pressure 5MPa gathers CO in real time
2Each the pressure tap pressure dynamic change of oil displacement process rock core diverse location, metering extraction profit amount;
Step 36: utilize a certain moment t of displacement pressure value P
t(x) with length integral area and irreducible water condition under the pressure value P of oil phase
OiRatio calculating energy retention coefficient η with the length integral area
p, design formulas is:
The concrete schematic diagram that calculates is referring to Fig. 3.
With reference to Fig. 4, show water drive of the present invention, N
2Drive and CO
2The energy retention coefficient schematic diagram of correspondence when mixed phase drives the every propelling of process displacing front 12.5cm.Because gas drive arrives under the prerequisite of same effect (identical oil saturation) with water drive, both used time phase differences are very big, for the ease of contrast directly perceived, its time carried out normalization, so use non dimensional time.
The energy retention coefficient characterizes pressure maintenance level in the displacement process, discloses pressure transitivity and energy supplement validity.As seen from Figure 4: by energy retention coefficient η
pAs can be known, water drive oil energy retention coefficient descends earlier in time and afterwards rises, and has flex point, and the initial stage reduces very fast, minimumly is reduced to 63%, and the later stage slowly rises.N2 displacement of reservoir oil energy retention coefficient is monotonic increase, finally remains on 125%, and stratum energy replenishes fully in the displacement process.CO2 miscible displacement of reservoir energy retention coefficient rises earlier and afterwards descends, and has flex point, and after mixed phase finished, pressure maintenance level was down to 112%, and the displacement process stratum energy is abundant.High infiltration rock core water drive effective pressure coefficient is about 100%, and water drive is less to the reservoir pressure systematic influence.The hyposmosis water drive should be optimized well pattern, well spacing, keeps stratum energy as far as possible.Draw low-permeability oil deposit displacement validity with this.
The embodiment of the invention has not only adopted water drive but also adopted gas drive, has namely related to mixed phase and has driven and related to non-phase-mixing driving, and provided detailed experiments step and evaluation method, and drawn the valuable true conclusion that meets.This shows, further, adopt similar method, can utilize the energy retention coefficient η that sets up in this experiment
pJudge the validity of any one low-permeability oil deposit displacement system.
The above-described specific embodiment; purpose of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the above only is the specific embodiment of the present invention; and be not intended to limit the scope of the invention; within the spirit and principles in the present invention all, any modification of making, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a method of estimating low-permeability oil deposit displacement validity is characterized in that, comprising:
Choose rock core and carry out displacement, and obtain the energy retention coefficient of described rock core with the energy curve of displacement time variation; Described energy retention coefficient is the pressure hold mode of described rock core in displacement process;
By the variation of described energy curve, estimate the validity of this displacement.
2. a kind of method of estimating low-permeability oil deposit displacement validity as claimed in claim 1 is characterized in that described method also comprises:
When described energy curve increases progressively, then the energy of described displacement keeps high;
When described energy curve successively decreases, then the energy of described displacement keeps low.
3. a kind of method of estimating low-permeability oil deposit displacement validity as claimed in claim 1 is characterized in that, the energy retention coefficient that obtains described rock core comprises:
Choose a plurality of pressure spots and real-time force value of gathering each pressure spot on the rock core;
Calculate the first integral area of each force value and length, calculate the second integral area of force value and the length of described rock core oil phase under the irreducible water condition simultaneously; Described length is that described pressure spot is to the distance of the injection end of described displacing medium;
Calculate the ratio of described first integral area and second integral area, obtain the energy retention coefficient of described rock core.
4. a kind of method of estimating low-permeability oil deposit displacement validity as claimed in claim 3 is characterized in that, a plurality of described pressure spots evenly distribute along the seepage direction of described rock core.
5. a kind of method of estimating low-permeability oil deposit displacement validity as claimed in claim 1 is characterized in that described displacement comprises: miscible-phase displacement and immiscible displacement.
6. a kind of method of estimating low-permeability oil deposit displacement validity as claimed in claim 1, it is characterized in that, after adopting multiple displacing medium that described rock core is carried out displacement respectively, the displacement time to every kind of displacing medium is carried out normalized, obtains the time dependent energy curve of energy retention coefficient under every kind of displacing medium.
7. a kind of method of estimating low-permeability oil deposit displacement validity as claimed in claim 1 is characterized in that, described rock core is the whole rock core of length 0.8m-1.5m.
8. device of estimating low-permeability oil deposit displacement validity is characterized in that corresponding device comprises:
Acquiring unit is used for choosing rock core and carries out displacement, and obtains the energy retention coefficient of described rock core with the energy curve of displacement time variation; Described energy retention coefficient is the pressure hold mode of described rock core in displacement process;
Analytic unit is used for the variation by described energy curve, estimates the validity of this displacement.
9. a kind of device of estimating low-permeability oil deposit displacement validity as claimed in claim 8 is characterized in that described acquiring unit also comprises:
Acquisition module is used for choosing a plurality of pressure spots and real-time force value of gathering each pressure spot on the rock core;
Computing module for the first integral area that calculates each force value and length, calculates the second integral area of force value and the length of described rock core oil phase under the irreducible water condition simultaneously; Described length is that described pressure spot is to the distance of the injection end of described displacing medium;
Described computing unit also is used for calculating the ratio of described first integral area and second integral area, obtains the energy retention coefficient of described rock core.
10. a kind of device of estimating low-permeability oil deposit displacement validity as claimed in claim 8, it is characterized in that, described device also comprises: processing unit, be used for after adopting multiple displacing medium that described rock core is carried out displacement respectively, the displacement time to every kind of displacing medium is carried out normalized, by the time dependent energy curve of energy retention coefficient under every kind of displacing medium of described acquiring unit acquisition.
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