CN104374683A - Device and method for testing core pore compressibility - Google Patents
Device and method for testing core pore compressibility Download PDFInfo
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- CN104374683A CN104374683A CN201410662702.6A CN201410662702A CN104374683A CN 104374683 A CN104374683 A CN 104374683A CN 201410662702 A CN201410662702 A CN 201410662702A CN 104374683 A CN104374683 A CN 104374683A
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Abstract
The invention relates to a device and a method for testing core pore compressibility. The method comprises the steps of selecting a core to be tested, wherein the core to be tested can be a low-porosity and low-permeability core; measuring the pore volume of the core by a saturated brine weighing method; calculating the volume coefficient of the brine used by an experiment; drawing volume shrinkage curves of a core holding unit and a connecting pipeline of the core holding unit; measuring the blank volumes of the core holding unit and the connecting pipeline of the core holding unit; measuring a core pore volume under each net effective pressure; calculating the measured results to obtain the core pore volume compressibility under all net effective pressures. By the device and the method, the core pore compressibility of the large-sized abnormal high-pressure low-permeability reservoir with can be tested and analyzed, and the error of the test results can be reduced.
Description
Technical field
The present invention relates to oil-gas field development core experiment analysis technology, particularly relate to a kind of rock core pore compressibility proving installation and method of testing thereof.
Background technology
Rock pore volume compressibility coefficient is an important parameter of hydrocarbon zone physical study, and it has important using value in evaluation hydrocarbon-bearing pool elasticity production capacity and dynamic geological reserves.For surpressure low permeability reservoir, because rock sample voidage is little, reservoir pressure change span greatly, causes compressibility coefficient to be difficult to Measurement accuracy.At present, surpressure low permeability reservoir rock core pore compressibility equally with conventional core all mainly continues to use that standard No. is SY/T 5815-2008, name is called the national oil Gas Industry standard of " rock pore volume compressibility coefficient assay method ".
But, " rock pore volume compressibility coefficient instrument " in above-mentioned national standard has the device having volumetric metering pump and apply pore pressure simultaneously, volumetric metering pump is used for pumping liquid in core holding unit, the device applying pore pressure is used for applying pore pressure to rock core to be measured, when measuring, instrument operator needs operational volume volume pump and pore pressure device simultaneously, therefore, inconvenient operation during measurement.
Further, the measuring method of the pore space compressibility of rock undertaken by the instrument in above-mentioned national standard, can not be measured the rock core pore compressibility of surpressure low permeability reservoir accurately, this be due to:
One, for high pressure low permeability compact reservoir, reservoir has low porosity and low permeability feature, according to the result of study of boundary layer theory and nuclear magnetic resonance, there is the dead volume that liquid cannot participate in flowing in hypotonic compact reservoir hole.Due to the singularity (as slippage effect) of gas molecule, part but can be flowed for gas for the dead volume liquid.This will cause with helium be medium obtain gas gaging hole gap volumetric quantities be greater than with salt solution be medium obtain liquid survey volume of voids.And the initial volume of voids of said method adopts helium to be medium, covering to press through in journey adopts salt solution to be medium, it is inevitable different that two kinds of different mediums record volume of voids, do not consider this difference and this species diversity is classified as pore compressibility during data processing, obviously like this can cause comparatively big error.
Two, relative to compact rock core hole, void volume in instrument (as in pipeline) is very large, in addition in high-pressure reservoir simulation, pressure span is larger, as the change that the volume of salt solution originally in experimentation of measuring media also can be can not ignore, and said method does not consider the volume change of salt solution itself, cause comparatively big error.
Three, the rock core yardstick that said method adopts is less, and the core diameter generally adopted in said method is less than 10cm, and length is less than 100cm.Because adopted rock core yardstick is less, if for low porosity and low permeability rock core, be difficult to set up the rock core irreducible water saturation that original water saturation matches with actual reservoir, and experimentation due to the water yield saturated in hole limited, be difficult to the volume change of the accurate-metering water yield.
Four, the experimental pressure scope of said method is lower, and for Abnormal High Pressure Gas Reservoirs stress, its variation range is obviously higher than 70MPa, and existing equipment is difficult to simulation surpressure hydrocarbon-bearing pool STRESS VARIATION.
Therefore, existing rock pore volume compressibility coefficient determinator and assay method thereof are difficult to meet surpressure low permeability reservoir rock core pore compressibility experiment test and analysis.
Summary of the invention
For above-mentioned technical matters, the object of the present invention is to provide a kind of rock core pore compressibility proving installation simple to operation, the present invention also aims to provide a kind of measurement result conventional core pore compressibility method of testing more accurately, and the rock core pore compressibility method of testing of a kind of measurement result surpressure low permeability reservoir more accurately.
The technical scheme of the application is as follows:
A kind of rock core pore compressibility proving installation, described device comprises the volumetric metering pump (MP), the first stop valve (V1), the first pressure transducer (P1), core holding unit (CH), the second pressure transducer (P2), the second stop valve (V2) and the vacuum pump (VP) that are connected successively;
Described device also comprises ring press pump (HP) and the 3rd pressure transducer (P3), described ring press pump (HP) connects the annular space of described core holding unit (CH) by the 3rd stop valve (V3), and described 3rd pressure transducer (P3) connects the annular space of described core holding unit (CH);
Described volumetric metering pump (MP) is for applying pore pressure to rock core, and measure the liquid volume pumped in described core holding unit (CH) and associated line thereof, described ring press pump (HP) is for applying burden pressure to rock core, the maximum pressure that described core holding unit (CH) bears is 140MPa, the maximum gauge holding rock core to be measured is 10cm, and the maximum length holding rock core to be measured is 100cm.
A kind of rock core pore compressibility method of testing, the method comprises,
Choose rock core to be measured, described rock core is the rock core of low porosity and permeability;
Prepare the salt solution having identical salinity with the glassware for drinking water on object stratum, and pass through formula
Calculate the volume factor B of described salt solution
w, wherein, k
1=0.351104 × 10
-6, k
2=0.687323 × 10
-5, k
3=0.555917 × 10
-11, k
4=0.350709 × 10
-6, k
5=0.993080 × 10
-5, k
6=0.166979 × 10
-11, p
1=145.038p, p are Pore Pressure force value, and c is brine concentration value;
Measure the weight of described rock core, by saturated for described rock core described salt solution, measure the weight of described rock core after saturated brine, calculate the difference of described rock core weight before and after saturated brine, based on described difference and described salt solution density calculation described in the voidage V of rock core
p;
Choosing pressure coefficient is known liquid, described liquid is pumped in described core holding unit (CH) and associated line thereof, adjusted volume volume pump (MP), the pressure of liquid in core holding unit (CH) is made progressively to change to 100MPa from 0MPa, the liquid volume pumped into corresponding under measuring each pressure, liquid volume corresponding under calculating each pressure described based on described pressure coefficient, the measured value of liquid volume corresponding under each pressure described in calculating and the difference of calculated value, the volume change discharge curve of described core holding unit (CH) and associated line thereof is drawn based on the difference corresponding to each pressure described and each pressure described,
Aluminum standard rock core is loaded described core holding unit (CH), described core holding unit (CH) and associated line thereof are vacuumized, close the first stop valve (V1), described salt solution is pumped in associated line, till brine pressure in this associated line equals 0.69MPa, now measure the brine volume V pumped into
0open the first stop valve (V1), close the second stop valve (V2), continue to pump into described salt solution, till brine pressure in described core holding unit (CH) equals 0.69MPa, now again measure the brine volume V pumped into
1, by formula V
d=V
1-V
0calculate the void volume V of described core holding unit (CH) and associated line thereof
d;
Rock core to be measured is loaded described core holding unit (CH), described core holding unit (CH) and associated line thereof are vacuumized, change clean effective pressure P by changing burden pressure or changing pore pressure
c, measure each clean effective pressure P simultaneously
cthe corresponding brine volume V pumped into
c, described clean effective pressure P
cequal the difference of burden pressure and pore pressure;
According to formula
Calculate each clean effective pressure P described
cthe pore volume compressibility c of corresponding rock core
p, wherein, Δ V
sfor with each clean effective pressure P
cthe volume change stating core holding unit (CH) and associated line thereof corresponding to corresponding pore pressure, described volume change draws from volume change discharge curve.
Technique scheme has following beneficial effect:
A kind of rock core pore compressibility proving installation provided by the invention, volumetric metering pump in described device can not only measure the liquid volume pumped in described core holding unit (CH) and associated line thereof, can also be used for applying pore pressure to rock core, therefore, the operation of described device is more simple and convenient.A kind of rock core pore compressibility method of testing provided by the invention, makes porosity measurement more unified (liquid gaging hole porosity); Secondly, consider liquid and the compressibility coefficient of device own thus record accurate volume of voids; 3rd, increase rock sample size (diameter can reach 10cm, and length can reach 100cm) thus be convenient to saturated and increase liquid volume measurement accuracy; 4th, adopt high pressure resistant equipment simulating high-pressure reservoir effective stress scope (0 ~ 100MPa), therefore, described method of testing can not only improve the accuracy of conventional core pore compressibility measurement result, can also improve the accuracy of the rock core pore compressibility measurement result of surpressure low permeability reservoir.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the structural representation of a kind of rock core pore compressibility of embodiment of the present invention proving installation.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
The application provides a kind of rock core pore compressibility proving installation, as shown in Figure 1.Described device comprises, volumetric metering pump MP, ring press pump HP, vacuum pump VP, core holding unit CH, stop valve V1, V2 and V3, pressure transducer P1, P2 and P3.
Volumetric metering pump MP connects stop valve V1, stop valve V1 Bonding pressure sensor P1, pressure transducer P1 connects the inlet end of core holding unit CH, connecting pipeline used is high pressure resistant hollow pipeline, wherein volumetric metering pump MP is used in core holding unit CH and associated line thereof, pump into test liquid used, and measure the volume of liquid pumped into, and measuring accuracy can reach ± and 10
-6mL.Volumetric metering pump MP is also for applying pore pressure to rock core to be measured, the scope applying pore pressure is 0 ~ 100MPa, described pore pressure refers to the pressure of liquid described in rock core, by regulating described volumetric metering pump MP, the volume pumping into liquid in core holding unit CH and associated line thereof can be changed, and then change the pore pressure of rock core to be measured.
Ring press pump HP connects stop valve V3, and stop valve V3 Bonding pressure sensor P3, pressure transducer P3 is connected the annular space of core holding unit CH with stop valve V3.Rock core is placed in the round rubber cover of core holding unit CH, places the steel circular cylindrical plug that has central through hole at rock core two ends respectively, be connected to pipeline respectively at the through hole of plug, experimental liquid can be made to flow through rock core by pipeline.Rubber sleeve to be placed in a circular steel cylinder (outer wall of core holding unit) and to form airtight annular space with steel cylinder, when injecting highly pressurised liquid or gas to annular space, highly pressurised liquid or gas act on rubber sleeve outer wall, rubber sleeve can be made to deform and produce radial pressure to rock core.Ring press pump HP is used for applying burden pressure to rock core to be measured, described burden pressure refers to and utilizes ring press pump HP by the water in the annular space of compression core holding unit CH or gas to realize supercharging, described water or gas contact with the rubber sleeve of parcel rock core, and directly do not contact with rock core to be measured, the scope that ring press pump HP applies burden pressure is 0 ~ 140MPa.
Vacuum pump VP connects stop valve V2, and stop valve V2 Bonding pressure sensor P2, pressure transducer P2 connect the endpiece of core holding unit CH, and vacuum pump VP is used for vacuumizing core holding unit CH and associated line thereof in experimentation.
Core holding unit CH can be high pressure resistant, and the scope of proof pressure is 0 ~ 140MPa.Pressure transducer P1, P2 and P3 are used for monitoring pressure, and measurement pressure limit is 0 ~ 140MPa.Pipeline in the application's proving installation and stop valve all can the pressure of withstand voltage 0 ~ 140MPa scope.
The following detailed description of the method for the proving installation testing rock core pore compressibility according to the application.The method is carried out according to following steps:
1) rock core to be measured is chosen and volume of voids under measuring its normal pressure.
Select to need the rock sample carrying out experiment test, rock sample is regular piston-shaped rock core, and the diameter of rock core can have three kinds of specification 2.5cm, 3.8cm and 10cm, and monolithic length is less than 100cm.The rock core chosen can be conventional core, also can be low porosity and low permeability rock core, and described low porosity and low permeability rock core generally refers to that the factor of porosity of rock core is less than 15%, permeability is less than 50 × 10
-3μm
2rock core.
Volume of voids under the normal pressure of rock core under normal circumstances adopts helium porosimeter to measure, but be that the measurement result of medium there are differences based on the measurement result of helium porosimeter with adopting salt solution.Covering to press through in journey due to the application follow-up adopts salt solution to be volume of voids under the normal pressure of Medium Measurement rock core, and therefore, the application adopts saturated brine weight method to measure volume of voids V under its normal pressure for the rock core to be measured chosen
p.Concrete measuring process is as follows:
By reservoir water salinity preparation NaCl salt solution; First the quality of saturated front rock core is measured; If the rock core to be measured chosen is low porosity and low permeability rock core, then adopts and vacuumize pressurization to rock core saturated brine to be measured, if the rock core chosen is conventional core, then direct to rock core saturated brine to be measured; Then measure the quality of the rock core after saturated brine, calculate rock sample active porosity volume V according to saturated front and back rock sample is of poor quality with brine density that is that adopt
p.
2) volume factor of salt solution is calculated.
The volume factor B of NaCl brine solution
wcan according to following formulae discovery:
In formula:
k
1＝0.351104×10
-6；
k
2＝0.687323×10
-5；
k
3＝0.555917×10
-11；
k
4＝0.350709×10
-6；
k
5＝0.993080×10
-5；
k
6＝0.166979×10
-11；
p
1＝145.038p；
C is the numerical value of NaCl solution concentration, and unit is milligrams per liter (mg/l);
P is the numerical value of pore pressure, and unit is MPa (MPa).
3) constant of instrument is demarcated.
Before measurements, need to calibrate instrument and demarcate.Instrumental calibration comprises the demarcation of measuring stick diameter, the demarcation of instrument void volume, the demarcation of instrument pressure variable coefficient, pressure gauge and manometric demarcation.
Wherein, the scaling method of instrument pressure variable coefficient is: measure with the liquid of known pressure coefficient, draw out pressure and instrument volume shrinkage mass curve.Concrete grammar is as follows:
Close stop valve V1, open stop valve V2, by vacuum pump VP, described core holding unit (CH) and associated line thereof are vacuumized.Open stop valve V1, close stop valve V2, choosing pressure coefficient is known liquid, by volumetric metering pump MP, described liquid is pumped in described core holding unit CH and associated line thereof, adjusted volume volume pump MP, the pressure of liquid in core holding unit CH is made progressively to change to 100MPa from 0MPa, in the process of adjusted volume volume pump MP, the liquid volume (being called the variable of liquid volume) pumped into that the liquid measured in core holding unit CH by volumetric metering pump MP is corresponding under each pressure, liquid in described core holding unit CH liquid volume (being called the calculated value of liquid volume) corresponding under each pressure is calculated based on described pressure coefficient, calculate the variable of liquid volume corresponding under each pressure and the difference of calculated value, the volume change discharge curve of described core holding unit CH and associated line thereof is drawn based on the difference corresponding to each pressure and each pressure described.
4) void volume in core holding unit and pipeline system is measured.
Aluminum standard rock core is loaded described core holding unit CH, by vacuum pump VP, described core holding unit CH and associated line thereof are vacuumized, experimentally require to add burden pressure by ring press pump HP, close stop valve V1, in associated line, described salt solution is pumped into by volumetric metering pump MP, brine pressure in this associated line now measures the brine volume V pumped into till equaling 0.69MPa (100psi)
0.Open stop valve V1, close stop valve V2, liquid enters core holding unit and arrives stop valve V3 by pipeline, now the mesohalobic pressure of this associated line reduces, continue to pump into described salt solution, brine pressure in described core holding unit CH and associated line thereof now measures the brine volume V pumped into till equaling 0.69MPa (100psi) again
1.By the void volume V of core holding unit described in formulae discovery (CH) and associated line thereof
d, computing formula is as follows,
V
d＝V
1-V
0(2)
5) volume of voids of rock core is measured.
The volume of voids of rock core is measured and is obtained under clean effective pressure, described clean effective pressure P
cfor the difference of burden pressure and pore pressure.
Change clean effective pressure P
cthe volume of voids measuring rock sample has two kinds of methods, a kind of for keeping pore pressure to change net overburden pressure, another kind of for keeping burden pressure to reduce pore pressure.
Maintenance pore pressure changes net overburden pressure mensuration rock sample volume of voids method concrete steps:
Wrap up rock core with thermoplastic, and air between material and rock core is all eliminated, as rock sample has defect, then apply hot-melt plastic filling;
By vacuum pump VP, described core holding unit CH and associated line thereof are vacuumized, rock core to be measured is loaded core holding unit CH, experimentally require the burden pressure adding first experiment point, the experimental needs of burden pressure of first and setting flexibly, the burden pressure of first is greater than 0.69MPa, is less than 140MPa;
Precession volumetric metering pump, makes pore pressure be increased to 0.69MPa (100psi), and keeps pressure change in 5min to be less than 0.0069MPa.Record each parameter value of first burden pressure,
Empirically the pointwise that needs of object increases burden pressure.Pointwise increases in the process of burden pressure, records each parameter value of each point when pore pressure is at 0.69MPa, until terminate experiment when burden pressure reaches top pressure, described parameter value comprises clean effective pressure P
c, volume pump metered volume V
c.
Maintenance burden pressure reduces pore pressure mensuration rock sample volume of voids method concrete steps:
Wrap up rock sample with thermoplastic, and air between material and rock sample is all eliminated, as rock sample has defect, then apply hot-melt plastic filling;
Rock sample to be measured is loaded core holding unit CH, core holding unit CH and associated line thereof are vacuumized.Open stop valve V3 and V1 after vacuumizing end, pump into salt solution and at least saturated 12 hours with volumetric metering pump;
At burden pressure all the time higher than under the condition of pore pressure 2-5MPa, to burden pressure and pore pressure continuous pressure, until burden pressure or pore pressure reach the top pressure of requirement of experiment;
By adjusted volume volume pump, make pore pressure reach first experiment spot pressure, and keep pressure change in 5min to be less than 0.0069MPa.Record each parameter value of the first measuring point, comprise clean effective pressure P
c, volume pump metered volume V
c;
Empirically require that pointwise reduces pore pressure, record each parameter value of each measuring point after pore pressure is stablized, until terminate experiment when pore pressure drops to 0.69MPa (100psi), described parameter value comprises clean effective pressure P
c, volume pump metered volume V
c.
6) rock pore volume compressibility coefficient is calculated.
When rock pore volume compressibility coefficient refers to and changes unit pressure, the changing value of unit volume of voids, that is:
In formula:
C
pfor rock pore volume compressibility coefficient, unit is Mpa
-1;
DV
pvolume of voids change when/dp is unit pressure change, unit is cm
-3/ Mpa;
V
pfor rock core initial pore volume, unit is cm
-3.
Sample is by clean effective pressure P
ctime, the cumulative volume variation delta V of volumetric metering pump metering
tfor pore volume change Δ V
p, brine volume variation delta V in system
ewith instrument volume variation delta V
ssum, namely
ΔV
T＝ΔV
P+ΔV
E+ΔV
S(4)
The cumulative volume changes delta V of volume pump metering
tfor rock sample volume of voids V during atmospheric pressure
dwith instrument void volume V
psum and clean effective pressure P
ctime volume pump metered volume V
cdifference, be calculated as follows,
ΔV
T＝(V
d+V
p)-V
c(5)
Brine volume variation delta V in system
e, be calculated as follows,
ΔV
E＝(V
d+V
p)(1-B
W) (6)
Instrument body amasss decrement Δ V
sby step 3) in the pressure drawn out and instrument volume shrinkage mass curve draw.
Formula (5), formula (6) are substituted into formula (4) and can try to achieve pore volume change Δ V
p:
ΔV
P＝ΔV
T-(ΔV
E+ΔV
S)＝(V
d+V
p)B
W-V
c-ΔV
S(7)
By step 1), step 2), step 3), step 4), step 5) can obtain respectively: rock core initial pore volume V
p, brine volume coefficient B
w, instrument volume variation delta V
s, instrument void volume V
d, volume pump metered volume V
c.Through type (6) can try to achieve effective stress P
ctime volume change Δ V
p, rock pore volume compressibility coefficient C can be obtained according to formula (3)
p, that is,
Wherein,
V
dfor the void volume of described core holding unit CH and associated line thereof,
V
pthe voidage of described rock core, B
wfor the volume factor of described salt solution,
V
cfor this clean effective pressure P
ctime the brine volume that pumps into,
Δ V
sfor with this clean effective pressure P
cthe volume change of described core holding unit CH and associated line thereof during corresponding pore pressure, described volume change draws from volume change discharge curve.
Rock pore volume compressibility coefficient is an important parameter of hydrocarbon zone physical study, and it has important using value in evaluation hydrocarbon-bearing pool elasticity production capacity and dynamic geological reserves.For surpressure low permeability reservoir, because rock sample voidage is little, reservoir pressure change span greatly, causes compressibility coefficient to be difficult to Measurement accuracy.From the above mentioned, first the application makes porosity measurement more unified (liquid gaging hole porosity) by improving low permeability reservoir initial porosity measuring method; Secondly, consider liquid and the compressibility coefficient of device own thus record accurate volume of voids; 3rd, increase rock sample size (diameter can reach 10cm, and length can reach 100cm) thus be convenient to saturated and increase liquid volume measurement accuracy; 4th, adopt high pressure resistant equipment simulating high-pressure reservoir effective stress scope (0-100MPa).Improved one's methods with technological innovation by above series thus define a kind of surpressure low permeability reservoir pore space compressibility of rock proving installation and method of testing.This device has unified porosity measurement medium, solves the problem that hypotonic fine and close rock sample volume of voids is difficult to accurately measure less; Overcome void volume relatively large, the difficulty that the compressibility of test medium own causes error larger; Surpressure reservoir effective stress scope can be simulated, meet the requirement of surpressure low permeability reservoir pore space compressibility of rock testing and analyzing.
Above-described embodiment; object of the present invention, technical scheme and beneficial effect are further described; be understood that; the foregoing is only the specific embodiment of the present invention; the protection domain be not intended to limit the present invention; within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. a rock core pore compressibility proving installation, it is characterized in that, described device comprises the volumetric metering pump (MP), the first stop valve (V1), the first pressure transducer (P1), core holding unit (CH), the second pressure transducer (P2), the second stop valve (V2) and the vacuum pump (VP) that are connected successively;
Described device also comprises ring press pump (HP) and the 3rd pressure transducer (P3), described ring press pump (HP) connects the annular space of described core holding unit (CH) by the 3rd stop valve (V3), and described 3rd pressure transducer (P3) connects the annular space of described core holding unit (CH);
Described volumetric metering pump (MP) for applying pore pressure to rock core, and measures the liquid volume pumped in described core holding unit (CH) and associated line thereof, and described ring press pump (HP) is for applying burden pressure to rock core.
2. device as claimed in claim 1, it is characterized in that, the maximum pressure that described core holding unit (CH) bears is 140MPa, and the maximum gauge holding rock core to be measured is 10cm, and the maximum length holding rock core to be measured is 100cm.
3. device as claimed in claim 1, it is characterized in that, the maximal value that described ring press pump (HP) applies burden pressure is 140MPa.
4. device as claimed in claim 1, it is characterized in that, the maximal value that described volumetric metering pump (MP) applies pore pressure is 100MPa, and measuring accuracy is ± 10
-6ml.
5. device as claimed in claim 1, it is characterized in that, the measurement range of the measurement range of described first pressure transducer (P1), the measurement range of described second pressure transducer (P2) and described 3rd pressure transducer (P3) is 0 ~ 140MPa.
6. utilize a method for the device to test rock core pore compressibility according to any one of claim 1-5, it is characterized in that, the method comprises:
Choose rock core to be measured, described rock core is the rock core of low porosity and permeability;
Prepare the salt solution having identical salinity with the glassware for drinking water on object stratum, and pass through formula
calculate the volume factor B of described salt solution
w, wherein, k
1=0.351104 × 10
-6, k
2=0.687323 × 10
-5, k
3=0.555917 × 10
-11, k
4=0.350709 × 10
-6, k
5=0.993080 × 10
-5, k
6=0.166979 × 10
-11, p
1=145.038p, p are Pore Pressure force value, and c is brine concentration value;
Measure the weight of described rock core, by saturated for described rock core described salt solution, measure the weight of rock core after saturated brine, calculate the difference of described rock core weight before and after saturated brine, based on described difference and described salt solution density calculation described in the voidage V of rock core
p;
Be that known liquid pumps in core holding unit (CH) by pressure coefficient, adjusted volume volume pump (MP), the pressure of liquid in core holding unit (CH) is progressively changed from 0 ~ 100MPa, calculate the difference of the liquid volume that pump into corresponding with each pressure and the liquid volume calculated by pressure coefficient, the difference based on each pressure and the liquid volume corresponding with each pressure described draws the volume change discharge curve of described core holding unit (CH) and associated line thereof;
Aluminum rock core is loaded core holding unit (CH), close the first stop valve (V1), the brine volume V pumped into when the brine pressure measured in the associated line between volumetric metering pump (MP) and the first stop valve (V1) equals 0.69MPa
0, open the first stop valve (V1), close the second stop valve (V2), measure the brine volume V pumped into when the brine pressure in core holding unit (CH) equals 0.69MPa
1, by formula V
d=V
1-V
0calculate the void volume V of core holding unit (CH) and associated line thereof
d;
Rock core to be measured is loaded core holding unit (CH), by changing burden pressure or changing clean effective pressure P by changing pore pressure
c, measure and each clean effective pressure P
cthe corresponding brine volume V pumped into
c, described clean effective pressure P
cequal the difference of burden pressure and pore pressure;
According to formula
calculate and each clean effective pressure P described
cthe pore volume compressibility c of corresponding rock core
p, wherein, Δ V
sfor with each clean effective pressure P described
cthe volume change stating core holding unit (CH) and associated line thereof corresponding to corresponding pore pressure, described volume change draws from described volume change discharge curve.
7. method as claimed in claim 6, is characterized in that, changes clean effective pressure P by changing burden pressure
ccomprise:
Described core holding unit (CH) and associated line thereof are vacuumized, apply the first burden pressure, described first burden pressure is greater than 0.69MPa;
Open the first stop valve (V1), close the second stop valve (V2), in core holding unit (CH), pump into salt solution, till pore pressure equals 0.69MPa, calculate clean effective pressure P
c, measure the brine volume V pumped into simultaneously
c;
Progressively increase burden pressure, till burden pressure equals 140MPa;
Progressively increase in the process of burden pressure, after each step before next step, adjusted volume volume pump (MP), till pore pressure equals 0.69MPa, now calculates clean effective pressure P
c, measure the brine volume V pumped into simultaneously
c.
8. method as claimed in claim 6, is characterized in that, changes clean effective pressure P by changing pore pressure
ccomprise:
Described core holding unit (CH) and associated line thereof are vacuumized, in described core holding unit (CH) and associated line thereof, pumps into described salt solution;
Be greater than the condition of pore pressure 2 ~ 5MPa at burden pressure under, increase burden pressure and pore pressure, till pore pressure equals 100MPa;
Apply the first pore pressure, described first pore pressure is greater than 0.69MPa, calculates clean effective pressure P
c, measure the brine volume V pumped into simultaneously
c;
Progressively reduce pore pressure, till pore pressure equals 0.69MPa;
Progressively reduce in the process of pore pressure, after each step before next step, calculate clean effective pressure P
c, measure the brine volume V pumped into simultaneously
c.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410662702.6A CN104374683B (en) | 2014-11-19 | 2014-11-19 | A kind of rock core pore compressibility test device and its method of testing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410662702.6A CN104374683B (en) | 2014-11-19 | 2014-11-19 | A kind of rock core pore compressibility test device and its method of testing |
Publications (2)
| Publication Number | Publication Date |
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| CN105160146A (en) * | 2015-07-07 | 2015-12-16 | 中国石油天然气股份有限公司 | Water flooding characteristic relation chart generation method and apparatus |
| CN105673003A (en) * | 2015-12-29 | 2016-06-15 | 中国石油天然气股份有限公司 | Tight oil exploitation physical simulation test method |
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