CN104266950B - Portable rock core perm-plug method measurement apparatus - Google Patents
Portable rock core perm-plug method measurement apparatus Download PDFInfo
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- CN104266950B CN104266950B CN201410447200.1A CN201410447200A CN104266950B CN 104266950 B CN104266950 B CN 104266950B CN 201410447200 A CN201410447200 A CN 201410447200A CN 104266950 B CN104266950 B CN 104266950B
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Abstract
The invention discloses a kind of portable rock core perm-plug method measurement apparatus, including rock core, pressure transducer, cylinder, also include hand hydraulic pump, rubber sleeve, piston, piston driver, computing chip and liquid crystal display, atmospheric valve, the rock core is positioned in cylinder, the rubber sleeve is arranged between rock core and cylinder, the hydraulic pump is arranged at the outside of cylinder, and be connected with the rubber sleeve, the piston and the piston driver are arranged in cylinder, inner chamber is formed between one end face of the rock core and the piston, the pressure transducer, the computing chip is arranged at the outside of cylinder with liquid crystal display and the atmospheric valve, and be connected with the inner chamber.The portable rock core perm-plug method measurement apparatus compact of the present invention, simple structure are convenient for carrying, it is adaptable to which field or situ of drilling well carry out permeability survey.
Description
Technical field
The invention belongs to petroleum works technical field, is related to the e measurement technology of core permeability, more particularly to it is a kind of portable
Formula rock core perm-plug method measurement apparatus.
Background technology
In petroleum industry, permeability is to characterize important parameter of the oil gas by reservoir rock ability, generally using gas
Or liquid is measured to core permeability as medium.In testing indoors, the test medium of perm-plug method can be helium
Gas or nitrogen, may also be employed air measurement rock permeability in the case where experimental precision is less demanding；Liquid surveys permeability
Test medium is generally water or crude oil.
Under normal circumstances, laboratory core test results contrast is accurate, but experimental facilitiess are huge, high to environmental requirement,
Field carrying is not easy to, equipment is drilled through using portable rock sample in the wild and is taken out rock sample of appearing, or adopt core drill at the scene
After head takes out reservoir rock sample, need for sample to deliver laboratory and be analyzed, it is long that the process expends time cycle, it is impossible in real time
Understanding formation parameter, until laboratory measurement, the property of rock has occurred and that change, therefore cannot reflect real rock core gas
Survey permeability.
At present, the measuring method of core permeability mainly has two kinds, steady state method and cold store enclosure.Steady state method is referred in test
Process medium fluid forms steady seepage, and flowing measures the pressure and the flow by rock core at rock core two ends in steady statue,
Core permeability is calculated using Darcy formula.The method is relatively reliable, using more, but operates more complicated, time of measuring
The stability of long and data is subject to more multifactorial impact.In steady state method, for the measurement of fluid flow, particularly hypotonic rock
The measurement of stone tiny flow quantity is highly difficult and also not accurate enough.
Steady state method perm-plug method is core permeability measuring method common at present, mainly has following deficiency：Equipment is huge
Greatly, not only need to equip nitrogen or helium source of the gas, in addition it is also necessary to huge constant voltage room and constant-pressure control device, it has not been convenient to which field is surveyed
Amount；Upstream and downstream constant voltage room pressure reduction can not be strictly controlled, needs pressure feedback control device is installed to ensure rock between upstream and downstream
Heart entrance and exit constant pressure differential, it is oversize the time required to reaching balance；Gas flowmeter typically uses soap bubble flowmeter or bead
Lifting height is measured, and as gas has compressibility and viscosity, the accuracy of the data measured by the said equipment is relatively low.
Cold store enclosure is referred to and does not require that in test process fluid forms steady seepage, and flowing is in unsteady state, only
Measure pressure versus time curve, it is possible to core permeability is calculated using the method for calculus.Cold store enclosure has
Have the advantages that easy to operate, measuring speed is fast, data uniformities are preferable.What is more important it avoid the survey of gas flow
Amount.
Cold store enclosure is by measuring pressure over time calculating core permeability, it is to avoid gas flow measurement is not
Accurate shortcoming, but due to needing source of the gas, its equipment is huger, is not suitable for field work, and needs continuous measurement foot
The enough long time, core permeability could be calculated, if gas flow is unstable, the measurement effect of the device is also bad.
The content of the invention
To solve problems of the prior art, the present invention provides a kind of portable rock core perm-plug method measurement dress
Put, including rock core, pressure transducer, cylinder, also including hydraulic pump, rubber sleeve, piston, piston driver, computing chip with
Liquid crystal display, atmospheric valve, the rock core are positioned in cylinder, and the rubber sleeve is arranged between rock core and cylinder, the liquid
Press pump is arranged at the outside of cylinder, and is connected with the rubber sleeve, and the piston and the piston driver are arranged at cylinder
It is interior, inner chamber, the pressure transducer, the computing chip and liquid crystal are formed between an end face of the rock core and the piston
Display and the atmospheric valve are arranged at the outside of cylinder, and are connected with the inner chamber.
Current Unsteady-state Gas Permeability Measuring method needs the constancy of volume for ensureing constant volume chamber (inner chamber), and passes through air
Compressor or vaccum-pumping equipment manufacture pressure reduction, therefore equipment is huge, is not suitable for external pelivimetry out of office.The present invention cardinal principle be
At present on the basis of Unsteady-state Gas Permeability Measuring method, at the uniform velocity change the size of inner chamber, manufacture pressure reduction, huge gas need not be carried
Bottle and pressurizer, reduce Permeability tester volume, so as to reach miniaturization, portable purpose.By recording piston
During uniform motion, the pressure of inner chamber over time, and then measures rock core perm-plug method.
The portable rock core perm-plug method measurement apparatus of the present invention, are to be drilled through equipment using portable rock sample in the wild
Taking-up is appeared rock core, or takes out reservoir core using coring bit at the scene and be put in cylinder, using being integrated on cylinder
Small-scale liquid press pump applies certain confined pressure to rock core, and the piston in moving cylinder body, piston move with uniform velocity, and produces rock core two ends
Pressure reduction, and then measures rock core perm-plug method by the pressure at pressure inductor measurement rock core two ends over time.The survey
Amount device volume is compact, and simple structure is convenient for carrying, it is adaptable to which field or situ of drilling well carry out permeability survey.The measurement
Device projects portable advantage, can detect field acquisition rock sample Fast Evaluation is had important after obtaining rock core in the wild at once
Meaning.
Preferably, the hydraulic pump is hand hydraulic pump, alternatively small-scale liquid press pump or small-sized hand hydraulic pump.Institute
State hydraulic pump to be substituted by confined pressure pump.Hydraulic pump applies confined pressure to rock core by rubber sleeve in the form of hydraulic pressure.Hydraulic pump is to rock
The confined pressure that the heart applies is 0.5-3.0MPa, of the invention through experimental results demonstrate, applies the confined pressure of this value range, it can be ensured that gas
Body is non-leakage.The body of measurement apparatus can further be reduced using hand hydraulic pump, small-scale liquid press pump or small-sized hand hydraulic pump
Product and weight, make measurement apparatus more portable.
In any of the above-described scheme preferably, in the embedded barrel wall of the pressure transducer, measurement can further be reduced
The weight of device so as to more portable.
In any of the above-described scheme preferably, the pressure transducer protrudes the inwall of cylinder.
Pressure transducer can monitor the pressure change in inner chamber.Computing chip can collect the data of pressure transducer simultaneously
Rock core perm-plug method is calculated, while the numerical value of rock core perm-plug method is shown on a liquid crystal display.Atmospheric valve is oozing
It is closed in rate measurement process thoroughly, opens after measurement terminates, to balance the pressure in inner chamber.
In any of the above-described scheme preferably, an end face of the rock core is concordant with one end of the cylinder, another
Individual end face is in the inside of cylinder.
In any of the above-described scheme preferably, an end face of the rock core protrudes one end of the cylinder, another
End face is in the inside of cylinder.
In any of the above-described scheme preferably, the piston driver is arranged at one end of cylinder, with the rock core
Relatively.Piston driver can control piston uniform motion in the cylinder, at the uniform velocity pulled out or at the uniform velocity pushed away with the speed for giving
Enter, to control the size of inner chamber, it is ensured that the pressure reduction produced at rock core two ends is at least 0.2MPa.
In any of the above-described scheme preferably, the piston driver includes motor, roller, power supply.Power supply
Motor is driven at the uniform velocity to rotate, motor drives roller rotation.Roller is that the tooth bar on gear structure, with piston rod is mutual
Engagement.The rotary speed of roller receives the control of computing chip.
In any of the above-described scheme preferably, the motor is connected with the roller, the roller and piston rod
On tooth bar engagement.
In any of the above-described scheme preferably, in the embedded barrel wall of the power supply, measurement apparatus can further be reduced
Weight so as to more portable.
In any of the above-described scheme preferably, the power supply is battery.
In any of the above-described scheme preferably, the battery is positioned in the power slot in embedded barrel wall.It is embedded
Power slot, can further reduce the weight of measurement apparatus so as to more portable.
In any of the above-described scheme preferably, the cylinder is made up of aluminium alloy, magnesium alloy or titanium alloy material.On
State alloy material lighter, intensity is high, good processability, be easy to the protecting film that nature produces one layer of compact and firm on its surface,
Protect the substrate can not corroded well.
In any of the above-described scheme preferably, the cylinder is made up of stainless steel material.The intensity of stainless steel material is high,
Hardness is high, and wearability and corrosion resistance preferably, also can be used as cylinder material.
In any of the above-described scheme preferably, the wall thickness of the cylinder is 1.0-5.0cm.The present invention is through many experiments
Prove, when cylinder is made by aluminium alloy, magnesium alloy or titanium alloy material, the wall thickness of cylinder suitably can increase, bigger to bear
Pressure.
In any of the above-described scheme preferably, the wall thickness of the cylinder is 0.5-1.0cm.The present invention is through many experiments
Prove, when cylinder is made by stainless steel material, the wall thickness of cylinder suitably can reduce, although rustless steel than aluminium alloy, magnesium alloy and
Titanium alloy weight, but which can bear higher pressure.
In any of the above-described scheme preferably, the length of the cylinder is 50-80cm.The present invention is demonstrate,proved through many experiments
It is bright, the length of cylinder within this range when, the measurement apparatus can easily lift and put down, and still belong to portable category.
In any of the above-described scheme preferably, the thickness of the piston is 3.0-5.0cm.The present invention is through many experiments
Prove, the thickness of piston within this range when, it can be ensured that gas is non-leakage.
In any of the above-described scheme preferably, a diameter of 2.5cm of the rock core.Arrange between rock core and cylinder inboard wall
Rubber sleeve, to guarantee that gas is non-leakage, due to the thickness of rubber sleeve it is less, therefore the diameter of rock core (inner chamber is straight with cylinder internal diameter
Footpath) approximately equal can be regarded as, in the derivation of rock core gas superficial computing permeability formula, lumenal cross-section product is rock
Heart cross-sectional area.
In any of the above-described scheme preferably, the length of the rock core is 3.0-8.0cm.
The present invention be based on astable method measuring rock core perm-plug method, but in Unsteady-state Gas Permeability Measuring
Measurement process in, it is to avoid using vacuum machine or air compressor manufacture pressure reduction, but by piston uniform motion manufacture pressure
Difference, therefore measurement apparatus compact, reduces cost, are easy to carry.
The present invention also provides one kind and carries out the survey infiltration of rock core gas using above-mentioned portable rock core perm-plug method measurement apparatus
The measuring method of rate, comprises the following steps：
(1) rock core perm-plug method measurement apparatus are debugged, and the air-tightness of check measurement device；
(2) diameter and length of rock core are measured, measured value is input into into computing chip；
(3) rock core is positioned in rubber sleeve, confined pressure is applied to rock core by hydraulic pump；
(4) piston is pushed into into inner chamber minimum calibration position, closes atmospheric valve；
(5) pressure in pressure transducer measurement initial time inner chamber, sets piston movement speed, opens piston and drives dress
Put, pressure transducer record chamber pressure changes and the piston movement time, and data are input into computing chip in real time, and piston drives
Device quits work when piston is moved to inner chamber maximum calibration position, and computing chip calculates rock core gas superficial permeability, enters
And calculate rock core perm-plug method and store, complete first time measurement process；
During piston movement, computing chip calculates the rock core gas superficial permeability of each computation interval, and then
Calculate rock core perm-plug method.
(6) atmospheric valve is opened, after balance chamber pressure, atmospheric valve is closed, repeat step (5), piston driver will be living
Plug is moved to inner chamber minimum calibration position, carries out second measurement；
(7) computing chip calculates the meansigma methodss of measured value twice, as final rock core perm-plug method, and passes through liquid crystal
Display shows；
The piston moves with uniform velocity.The rock core perm-plug method measurement apparatus can be surveyed when cavity volume at the uniform velocity changes
Amount rock core perm-plug method.
The measuring method of the present invention can measure rock core perm-plug method twice, measurement effect during piston back-and-forth movement
Rate is high, and speed is fast.In measuring method using accurate pressure transducer record pressure over time, it is to avoid because of gas flow
Change and cause to measure inaccurate defect.In addition, calculating institute by the rock core gas superficial computing permeability formula of the present invention
The result for obtaining is more reliable.It is significant for field acquisition rock sample Fast Evaluation.
Preferably, repeat step (5), take multiple measurements, and computing chip calculates the meansigma methodss of multiple measured value, as
Final rock core perm-plug method, and shown by liquid crystal display.The measuring method of the present invention can take multiple measurements,
So that measurement result is more accurate, error is less.
According to the fine and close or loose situation of rock core, the measuring process of rock core perm-plug method is adjusted.If rock core is fine and close, infiltration
Rate is relatively low, then piston from inner chamber minimum calibration position be moved to inner chamber maximum calibration position when caused pressure reduction may not enough,
Therefore piston is moved to after inner chamber maximum calibration position, then is moved to inner chamber minimum calibration position, complete one-shot measurement process.
If rock core is loose, permeability is higher, then in measurement process need the movement velocity for increasing piston to measure.
In any of the above-described scheme preferably, the rock core perm-plug method measurement apparatus are that the survey of portable rock core gas is oozed
Saturating rate measurement apparatus.
In any of the above-described scheme preferably, the inner chamber minimum calibration position is piston and end of the rock core in cylinder
The distance in face is at 3.5cm.
In any of the above-described scheme preferably, the inner chamber maximum calibration position is moved to piston driver for piston
Place.
In any of the above-described scheme preferably, the hydraulic pump is 0.5-3.0MPa to the confined pressure that rock core applies.This
It is bright through experimental results demonstrate, apply the confined pressure of this value range, it can be ensured that gas is non-leakage.
In any of the above-described scheme preferably, the movement velocity of the piston is 0.1-10cm/s.The present invention is through big
Amount can ensure that the measured value of rock core perm-plug method is more reliable, more it is demonstrated experimentally that piston moves with uniform velocity in this velocity interval
Accurately, it is significant to field acquisition rock sample Fast Evaluation.
In any of the above-described scheme preferably, the computing formula of the rock core gas superficial permeability is
Wherein
In formula, K-rock core gas superficial permeability, D；1μm2=1D=1000mD；
A-lumenal cross-section product, cm2；
L-rock sample length, cm；
P1、P2- piston movement is to t1Moment and t2Moment, the pressure value in inner chamber, 0.1MPa；
P0- atmospheric pressure, 0.1MPa；
μ-gas viscosity, mPas；
V-piston movement speed, cm/s.
Calculating of the above-mentioned computing formula for the rock core gas superficial permeability of each computation interval during piston movement
Formula.
In any of the above-described scheme preferably, the derivation method of the computing formula of the rock core gas superficial permeability is pressed
Comprise the following steps according to sequencing,
(1), when assuming that piston is in inner chamber minimum calibration position, rock core hole is V with cavity volume sum；It is assumed that piston
The moment for calculating starting point in motor process in each computation interval is t1(i.e. piston cumulative motion time), chamber pressure is
P, rock core hole are V with cavity volume sum0, the volume that the gas of rock core hole and cavity volume is converted under atmospheric condition is
Vt；
(2) piston is in t1Move the dt times after moment, then the pressure in inner chamber is P+dP, rock core hole and cavity volume
Gas is converted to the volume under atmospheric condition for Vt+dV；
(3) in measurement and calculating process, motor process is divided into into the computation interval Δ t of several constant durations, is counted
The moment for calculating calculating starting point in interval is t1, the moment that terminating point is calculated in computation interval is t2, then Δ t=t2-t1It is fixed
Value；
(4) piston is in t1At the moment, according to atmospheric pressure equilibrium principle, then there is P0Vt=PV0；
(5) the piston movement dt times, according to atmospheric pressure equilibrium principle, then there is P0(Vt+ dV)=(P+dP) (V0+vAdt)；
(6) according to gas Darcy's law, then have
In formula, A'-rock core cross-sectional area, cm2；In view of lumenal cross-section product with rock core cross-sectional area A ' difference very
It is little, approximately equal, it is assumed that A'=A.
(7) arranged by the formula in step (4)-(6) and obtained
(8) the formula calculus in step (7) is obtained
Wherein,
(9) according to piston movement position relationship, then there is V0=V+At1v；
(10) formula in step (9) is substituted into into the formula in step (8) and rock core gas superficial permeability is obtained.
Derivation is as follows：
P0Vt=PV0 (1)
P0(Vt+ dV)=(P+dP) (V0+vAdt) (2)
Take above formula apart, then have
P0Vt+P0DV=PV0+PvAdt+V0dP+vAdtdP (3)
Formula (1) is substituted into into formula (3), and ignores higher-order shear deformation item dtdP, then had
According to gas Darcy's law, then have
In formula, A'-rock core cross-sectional area, cm2.In view of lumenal cross-section product with rock core cross-sectional area A ' difference very
It is little, approximately equal, it is assumed that A'=A.
Formula (4) is substituted into into formula (5), is then had
Formula (6) abbreviation is obtained into differential expression
Formula (7) two ends are integrated, is then had
Due toTherefore integral result is
Wherein,
According to piston movement position relationship, then have
V0=V+At1v (10)
Formula (10) is substituted into into formula (9), is then had
Wherein,
As can be seen that variable only has K mono- from formula (11), other are all known quantities, by P1、P2、t1、t2Substitution formula
(11) in, using Program by two way classification, the iteration lower limit K of wherein K1=1 × 10-3MD, iteration upper limit K2=3 ×
104The iterative initial value of mD, KThe K for solving isPressure reduction under rock core gas superficial
Permeability.
When piston is moved to inner chamber minimum calibration position from inner chamber maximum calibration position, initial condition piston is in inner chamber
During maximum calibration position, rock core hole is V with cavity volume sum, and related increment is only on symbol conversely, Computing Principle is identical.
In any of the above-described scheme preferably, make the inverse of pressure reduction in each computation interval during piston movement
With the graph of a relation of rock core gas superficial permeability, fitting a straight line, the straight line are with the y-intercept of rock core gas superficial permeability
Rock core perm-plug method.
In calculating process, the interval time of setting record pressure data is equal, then Δ t=t2-t1For definite value, each
Δ t is a computation interval；Record Δ t startings and end time chamber pressure value, obtain the gas superficial under the pressure reduction every time
Permeability, finally makes the graph of a relation of the inverse and gas superficial permeability of pressure reduction, fitting a straight line, straight line and permeability y-intercept
It is the perm-plug method of the rock sample.
In any of the above-described scheme preferably, the measurement range of the rock core perm-plug method is 1 × 10-3～3.0 ×
104mD。
The derivation of the computing formula of the rock core gas superficial permeability of the present invention is easily understood, and calculates the result of gained
It is more reliable, more accurate, and then the result of the rock core perm-plug method for measuring is also more accurately, for field acquisition rock sample is quickly commented
Valency is significant.
Description of the drawings
Fig. 1 is the structural representation of the preferred embodiment according to portable rock core perm-plug method measurement apparatus of the invention
Figure；
Fig. 2 is the structural representation of another preferred embodiment according to portable rock core perm-plug method measurement apparatus of the invention
Figure；
Fig. 3 is the preferred reality according to the piston driver in portable rock core perm-plug method measurement apparatus of the invention
Apply the structural representation of example；
Fig. 4 is the measuring method of the rock core perm-plug method according to portable rock core perm-plug method measurement apparatus of the invention
Flow chart；
Fig. 5 is public according to the rock core gas superficial computing permeability of portable rock core perm-plug method measurement apparatus of the invention
Piston uniform speed motion state schematic diagram in formula derivation；
Fig. 6 is a certain calculating area during piston movement according to portable rock core perm-plug method measurement apparatus of the invention
The inverse of interior pressure reduction and the graph of a relation of rock core gas superficial permeability.
Explanation is marked in figure：1- hand hydraulic pumps, 2- cylinders, 3- rock cores, 4- rubber sleeves, 5- inner chambers, 6- pistons, 7- pistons
Driving means, 8- pressure transducers, 9- computing chips and liquid crystal display, 10- atmospheric valves, 11- power supplys, 12- rollers, 13- drive
Galvanic electricity machine.
Specific embodiment
In order to be further understood that the content of the invention of the present invention, the present invention is elaborated below in conjunction with specific embodiment.
Embodiment one：
As shown in figure 1, a kind of portable rock core perm-plug method measurement apparatus, which includes rock core 3, pressure transducer 8, cylinder
Body 2, hand hydraulic pump 1, rubber sleeve 4, piston 6, piston driver 7, computing chip and liquid crystal display 9, atmospheric valve 10.Institute
State rock core 3 to be positioned in cylinder 2, the rubber sleeve 4 is arranged between rock core 3 and cylinder 2, and the hydraulic pump is arranged at cylinder 2
Outside, and be connected with the rubber sleeve 4, the piston 6 and the piston driver 7 are arranged in cylinder 2, the rock core
Inner chamber 5, the pressure transducer 8, the computing chip and liquid crystal display 9 are formed between 3 end face and the piston 6
The outside of cylinder 2 is arranged at the atmospheric valve 10, and is connected with the inner chamber 5.
Pressure transducer 8 is embedded in 2 wall of cylinder.One end face of rock core 3 protrudes one end of cylinder 2, and another end face exists
The inside of cylinder 2.Piston driver 7 is arranged at one end of cylinder 2, relative with rock core 3.Cylinder 2 is made up of stainless steel material,
2 length of cylinder is 50cm, and 2 wall thickness of cylinder is 0.5cm, and 6 thickness of piston is 3.0cm.
As shown in figure 3, piston driver 7 includes motor 13, roller 12, power supply 11.Motor 13 and roller
12 are connected, and roller 12 is engaged with the tooth bar on piston rod.Power supply 11 is embedded in 2 wall of cylinder.
As shown in figure 4, the survey of rock core perm-plug method is carried out using above-mentioned portable rock core perm-plug method measurement apparatus
Amount method is comprised the following steps：
(1) rock core perm-plug method measurement apparatus are debugged, and the air-tightness of check measurement device；
(2) diameter and length of rock core are measured, measured value is input into into computing chip；
(3) rock core is positioned in rubber sleeve, confined pressure is applied to rock core by hydraulic pump；
(4) piston is pushed into into inner chamber minimum calibration position, closes atmospheric valve；
(5) pressure in pressure transducer measurement initial time inner chamber, sets piston movement speed, opens piston and drives dress
Put, pressure transducer record chamber pressure changes and the piston movement time, and data are input into computing chip in real time, and piston drives
Device quits work when piston is moved to inner chamber maximum calibration position, and computing chip calculates rock core gas superficial permeability, enters
And calculate rock core perm-plug method and store, complete first time measurement process；
(6) atmospheric valve is opened, after balance chamber pressure, atmospheric valve is closed, repeat step (5), piston driver will be living
Plug is moved to inner chamber minimum calibration position, carries out second measurement；
(7) computing chip calculates the meansigma methodss of measured value twice, as final rock core perm-plug method, and passes through liquid crystal
Display shows；
The piston moves with uniform velocity.The rock core perm-plug method measurement apparatus can be surveyed when cavity volume at the uniform velocity changes
Amount rock core perm-plug method.
A diameter of 2.5cm of rock core, the length of rock core is 7.376cm；Hand hydraulic pump applies 1.0MPa to rock core and encloses
Pressure；It is inner chamber maximum calibration position at 3.5cm in the distance of the end face in cylinder that inner chamber minimum calibration position is piston and rock core
It is moved at piston driver for piston；The speed that piston moves with uniform velocity is 0.5cm/s.
As shown in figure 5, during piston movement the rock core gas superficial permeability of each computation interval computing formula
Derivation method comprise the following steps by its sequencing：
(1), when assuming that piston is in inner chamber minimum calibration position, rock core hole is V with cavity volume sum；It is assumed that piston
The moment for calculating starting point in motor process in each computation interval is t1(i.e. piston cumulative motion time), chamber pressure is
P, rock core hole are V with cavity volume sum0, the volume that the gas of rock core hole and cavity volume is converted under atmospheric condition is
Vt；
(2) piston is in t1Move the dt times after moment, then the pressure in inner chamber is P+dP, rock core hole and cavity volume
Gas is converted to the volume under atmospheric condition for Vt+dV；
(3) in measurement and calculating process, motor process is divided into into the computation interval Δ t of several constant durations, is counted
The moment for calculating calculating starting point in interval is t1, the moment that terminating point is calculated in computation interval is t2, then Δ t=t2-t1It is fixed
Value；
(4) piston is in t1At the moment, according to atmospheric pressure equilibrium principle, then there is P0Vt=PV0；
(5) the piston movement dt times, according to atmospheric pressure equilibrium principle, then there is P0(Vt+ dV)=(P+dP) (V0+vAdt)；
(6) according to gas Darcy's law, then have
In formula, A'-rock core cross-sectional area, cm2；In view of lumenal cross-section product with rock core cross-sectional area A ' difference very
It is little, approximately equal, it is assumed that A'=A.
(7) arranged by the formula in step (4)-(6) and obtained
(8) the formula calculus in step (7) is obtained
Wherein,
(9) according to piston movement position relationship, then there is V0=V+At1v；
(10) formula in step (9) is substituted into into the formula in step (8) and rock core gas superficial permeability is obtained.
Make during piston movement the pass of the inverse of pressure reduction and rock core gas superficial permeability in each computation interval
System's figure, fitting a straight line, the straight line are rock core perm-plug method with the y-intercept of rock core gas superficial permeability.
Calculated by taking artificial sand rock rock sample G-45 as an example, core diameter is 2.5cm, rock core length is 7.376cm, inner chamber
Diameter is approximately equal to 2.5cm, and atmospheric pressure is 0.1013MPa, and gas viscosity is 0.018448mPas, the piston setting in motion moment
Inner chamber is 17.185cm with the cumulative volume of blowhole3, rock pore volume is negligible, and the speed of piston uniform motion is
0.5cm/s, the data of record are processed, and make the graph of a relation of 1/P～K, as shown in Figure 6, it is known that the rock core gas surveys infiltration
Rate is 103.92mD.
Embodiment two：
Portable rock core perm-plug method measurement apparatus, the measuring method of rock core perm-plug method and rock core gas superficial are oozed
The computing formula and derivation of rate are identical with embodiment one thoroughly, except for the difference that：As shown in Fig. 2 portable rock core gas surveys infiltration
Pressure transducer in rate measurement apparatus protrudes the inwall of cylinder.Cylinder is made up of stainless steel material, and barrel lenght is 60cm, cylinder
It is 1.0cm that body wall is thick, and piston thickness is 3.5cm.Power supply in piston driver is battery, and battery is positioned over embedded barrel wall
In power slot in.The length of rock core is 3.0cm；Hand hydraulic pump applies the confined pressure of 0.5MPa to rock core；Piston does at the uniform velocity to be transported
Dynamic speed is 0.1cm/s.
Embodiment three：
Portable rock core perm-plug method measurement apparatus, the measuring method of rock core perm-plug method and rock core gas superficial are oozed
The computing formula and derivation of rate are identical with embodiment one thoroughly, except for the difference that：Cylinder is made up of stainless steel material, barrel lenght
For 55cm, cylinder wall thickness are 0.8cm, and piston thickness is 4.0cm.The length of rock core is 8.0cm；Hand hydraulic pump applies to rock core
The confined pressure of 3.0MPa；The speed that piston moves with uniform velocity is 0.8cm/s.
Example IV：
Portable rock core perm-plug method measurement apparatus, the measuring method of rock core perm-plug method and rock core gas superficial are oozed
The computing formula and derivation of rate are identical with embodiment one thoroughly, except for the difference that：Cylinder is made up of stainless steel material, barrel lenght
For 50cm, cylinder wall thickness are 0.6cm, and piston thickness is 3.5cm.The length of rock core is 6.5cm；Hand hydraulic pump applies to rock core
The confined pressure of 1.2MPa；The speed that piston moves with uniform velocity is 1.0cm/s.
Embodiment five：
Portable rock core perm-plug method measurement apparatus, the measuring method of rock core perm-plug method and rock core gas superficial are oozed
The computing formula and derivation of rate are identical with embodiment one thoroughly, except for the difference that：Cylinder is made up of aluminum alloy materials, barrel lenght
For 80cm, cylinder wall thickness are 1.0cm, and piston thickness is 4.5cm.The length of rock core is 5.5cm；Hand hydraulic pump applies to rock core
The confined pressure of 1.5MPa；The speed that piston moves with uniform velocity is 10cm/s.
Embodiment six：
Portable rock core perm-plug method measurement apparatus, the measuring method of rock core perm-plug method and rock core gas superficial are oozed
The computing formula and derivation of rate are identical with embodiment one thoroughly, except for the difference that：Cylinder is made up of aluminum alloy materials, barrel lenght
For 75cm, cylinder wall thickness are 3.0cm, and piston thickness is 5.0cm.The length of rock core is 7.5cm；Hand hydraulic pump applies to rock core
The confined pressure of 2.0MPa；The speed that piston moves with uniform velocity is 5.0cm/s.
Embodiment seven：
Portable rock core perm-plug method measurement apparatus, the measuring method of rock core perm-plug method and rock core gas superficial are oozed
The computing formula and derivation of rate are identical with embodiment one thoroughly, except for the difference that：Cylinder is made up of magnesium alloy materials, barrel lenght
For 70cm, cylinder wall thickness are 5.0cm, and piston thickness is 4.0cm.The length of rock core is 6.825cm；Hand hydraulic pump is applied to rock core
Plus the confined pressure of 2.5MPa；The speed that piston moves with uniform velocity is 1.5cm/s.
Embodiment eight：
Portable rock core perm-plug method measurement apparatus, the measuring method of rock core perm-plug method and rock core gas superficial are oozed
The computing formula and derivation of rate are identical with embodiment one thoroughly, except for the difference that：Cylinder is made up of magnesium alloy materials, barrel lenght
For 65cm, cylinder wall thickness are 4.0cm, and piston thickness is 4.5cm.The length of rock core is 7.553cm；Hand hydraulic pump is applied to rock core
Plus the confined pressure of 1.8MPa；The speed that piston moves with uniform velocity is 5.5cm/s.
Embodiment nine：
Portable rock core perm-plug method measurement apparatus, the measuring method of rock core perm-plug method and rock core gas superficial are oozed
The computing formula and derivation of rate are identical with embodiment one thoroughly, except for the difference that：As shown in Fig. 2 portable rock core gas surveys infiltration
Pressure transducer in rate measurement apparatus protrudes the inwall of cylinder.Cylinder is made up of aluminum alloy materials, and barrel lenght is 58cm, cylinder
It is 4.5cm that body wall is thick, and piston thickness is 4.0cm.Power supply in piston driver is battery, and battery is positioned over embedded barrel wall
In power slot in.The length of rock core is 8.0cm；Small-scale liquid press pump applies the confined pressure of 2.2MPa to rock core；Piston does at the uniform velocity to be transported
Dynamic speed is 2.5cm/s.
Embodiment ten：
Portable rock core perm-plug method measurement apparatus, the measuring method of rock core perm-plug method and rock core gas superficial are oozed
The computing formula and derivation of rate are identical with embodiment one thoroughly, except for the difference that：As shown in Fig. 2 portable rock core gas surveys infiltration
Pressure transducer in rate measurement apparatus protrudes the inwall of cylinder.Cylinder is made up of aluminum alloy materials, and barrel lenght is 68cm, cylinder
It is 4.3cm that body wall is thick, and piston thickness is 3.8cm.Power supply in piston driver is battery, and battery is positioned over embedded barrel wall
In power slot in.The length of rock core is 4.0cm；Small-sized hand hydraulic pump applies the confined pressure of 1.9MPa to rock core；Piston does even
The speed of speed motion is 3.3cm/s.
It will be apparent to those skilled in the art that the portable rock core perm-plug method measurement apparatus of the present invention include above-mentioned
The combination in any of each several part shown by the content of the invention of description of the invention and specific embodiment part and accompanying drawing, is limited to a piece
Width and for make description concisely without by these combination constitute each scheme describe one by one.It is all in the spirit and principles in the present invention
Within, any modification, equivalent substitution and improvements done etc. should be included within the scope of the present invention.
Claims (18)
1. a kind of portable rock core perm-plug method measurement apparatus, including rock core, pressure transducer, cylinder, it is characterised in that：Also
Including hydraulic pump, rubber sleeve, piston, piston driver, computing chip and liquid crystal display, atmospheric valve, the rock core is placed
In cylinder, the rubber sleeve is arranged between rock core and cylinder, and the hydraulic pump is arranged at the outside of cylinder, and with the rubber
Gum cover is connected, and the piston and the piston driver are arranged in cylinder, an end face and the piston of the rock core
Between form inner chamber, in the embedded barrel wall of the pressure transducer or protrusion cylinder inwall, the computing chip and liquid crystal
In the embedded barrel wall of display, the atmospheric valve is arranged at the outside of cylinder and is connected with the inner chamber；Hydraulic pump is applied to rock core
Plus confined pressure, piston uniform motion in the cylinder changes inner chamber size, pressure transducer record chamber pressure change and piston movement
Time, and data are input into computing chip in real time, computing chip calculates rock core gas superficial permeability, and then makes piston movement
During in each computation interval the inverse of pressure reduction and rock core gas superficial permeability graph of a relation, fitting a straight line, the straight line
Rock core perm-plug method is with the y-intercept of rock core gas superficial permeability；The calculating of the rock core gas superficial permeability is public
Formula is
Wherein,
In formula, K-rock core gas superficial permeability, D；1μm2=1D=1000mD；
A-lumenal cross-section product, cm2；
L-rock sample length, cm；
P1、P2- piston movement is to t1Moment and t2Moment, the pressure value in inner chamber, 0.1MPa；
P0- atmospheric pressure, 0.1MPa；
μ-gas viscosity, mPas；
V-piston movement speed, cm/s.
2. portable rock core perm-plug method measurement apparatus as claimed in claim 1, it is characterised in that：The hydraulic pump is handss
Shake hydraulic pump.
3. portable rock core perm-plug method measurement apparatus as claimed in claim 1 or 2, it is characterised in that：The rock core
One end face is concordant with one end of the cylinder, and another end face is in the inside of cylinder.
4. portable rock core perm-plug method measurement apparatus as claimed in claim 1 or 2, it is characterised in that：The rock core
One end face protrudes one end of the cylinder, and another end face is in the inside of cylinder.
5. portable rock core perm-plug method measurement apparatus as claimed in claim 1 or 2, it is characterised in that：The piston drives
Dynamic device is arranged at one end of cylinder, relative with the rock core.
6. portable rock core perm-plug method measurement apparatus as claimed in claim 5, it is characterised in that：The piston drives dress
Put including motor, roller, power supply.
7. portable rock core perm-plug method measurement apparatus as claimed in claim 6, it is characterised in that：The motor with
The roller is connected, and the roller is engaged with the tooth bar on piston rod.
8. portable rock core perm-plug method measurement apparatus as claimed in claim 6, it is characterised in that：The power supply is embedded in cylinder
In body wall.
9. portable rock core perm-plug method measurement apparatus as claimed in claim 6, it is characterised in that：The power supply is electricity
Pond.
10. portable rock core perm-plug method measurement apparatus as claimed in claim 9, it is characterised in that：The battery is placed
In the power slot in embedded barrel wall.
11. portable rock core perm-plug method measurement apparatus as claimed in claim 1 or 2, it is characterised in that：The cylinder by
Aluminium alloy, magnesium alloy or titanium alloy material are made.
12. portable rock core perm-plug method measurement apparatus as claimed in claim 1 or 2, it is characterised in that：The cylinder by
Stainless steel material is made.
13. portable rock core perm-plug method measurement apparatus as claimed in claim 11, it is characterised in that：The wall of the cylinder
Thick is 1.0-5.0cm.
14. portable rock core perm-plug method measurement apparatus as claimed in claim 12, it is characterised in that：The wall of the cylinder
Thick is 0.5-1.0cm.
15. portable rock core perm-plug method measurement apparatus as claimed in claim 1 or 2, it is characterised in that：The cylinder
Length is 50-80cm.
16. portable rock core perm-plug method measurement apparatus as claimed in claim 1 or 2, it is characterised in that：The piston
Thickness is 3.0-5.0cm.
17. portable rock core perm-plug method measurement apparatus as claimed in claim 1 or 2, it is characterised in that：The rock core
A diameter of 2.5cm.
18. portable rock core perm-plug method measurement apparatus as claimed in claim 1 or 2, it is characterised in that：The rock core
Length is 3.0-8.0cm.
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| CN107063968B (en) * | 2017-05-02 | 2023-06-13 | 三峡大学 | Concrete gas permeability testing device and method |
| CN111879674B (en) * | 2020-07-15 | 2022-02-01 | 西南石油大学 | Testing device and method for determining reasonable well closing time based on shale imbibition permeability |
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| CN1065936A (en) * | 1991-04-16 | 1992-11-04 | 四川石油管理局地质勘探开发研究院 | Core gas permeameter |
| CN101509865B (en) * | 2009-03-25 | 2010-08-18 | 中国科学院地质与地球物理研究所 | Nonsaturated soil hydraulic parameter measuring device |
| KR101248531B1 (en) * | 2011-12-05 | 2013-04-03 | 한국지질자원연구원 | Apparatus and method for measuring porosity and permeability of dioxide carbon underground storage medium |
| CN202500557U (en) * | 2012-04-05 | 2012-10-24 | 青岛石大石仪科技有限责任公司 | Portable point type rock core permeability tester |
| CN103994958B (en) * | 2014-01-02 | 2016-06-22 | 浙江海洋学院 | A kind of for measuring the measurement apparatus of ultra-low penetration rock core gas permeability and utilizing the measuring method of this device |
| CN203732405U (en) * | 2014-01-13 | 2014-07-23 | 中国石油天然气股份有限公司 | rock permeability testing device |
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