CN109900614A - The method for measuring Oil in Super-low Permeability core permeability - Google Patents
The method for measuring Oil in Super-low Permeability core permeability Download PDFInfo
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Abstract
The present invention provides a kind of method for measuring Oil in Super-low Permeability core permeability, and the method for the measurement Oil in Super-low Permeability core permeability uses core permeability test device, this method comprises: step 1, test obtains the pore volume of rock core；Step 2, rock core to be measured is packed into core permeability test device；Step 3, displacement pressure P1 is recorded；Step 4, the drop of pressure data P2 at displacement end is recorded；Step 5, data processing is carried out to pressure drop P2, to obtain the permeability of rock core.Based on the method for the measurement Oil in Super-low Permeability core permeability is analyzed by Well Testing Theory, testing injection/pressure fall is carried out to rock core, falloff curve is obtained, carries out curve fitting, to obtain core permeability；For hypotonic, special hypotonic and Oil in Super-low Permeability, its permeability can be quickly tested；Test method is simple, and calculated result is accurate.
Description
Technical field
The present invention relates to Oilfield Natural Gas Plant development technique fields, especially relate to a kind of measurement Oil in Super-low Permeability core permeability
Method.
Background technique
At present there are mainly two types of the test methods of low permeability cores permeability: steady state method and pulse attenuation method.Fig. 1 is using steady
The device schematic diagram of state method test permeability.Before experiment, core section product S and length L is measured.Rock core is mounted in core holding unit
In, by confining pressure booster, apply simulated formation confining pressure.Constant flow pump is the liquid of η with flow Q injection viscosity, passes through rock core, day
The changes in flow rate equaled a record in the unit time, same day flow and constant flow pump the injection flow Q that equals a record are suitable, it is believed that reach stable state.
Pressure gauge 1 and pressure gauge 2 record rock core pressure at two ends respectively, calculate pressure difference △ P.According to Darcy's law, rock can be calculated
Heart permeability.The record of data and calculating are completed by computer.
Steady state method is tested according to Darcy's law: Q/S=-k △ P/ η L；Q is flow (m in formula3/s)；S is sample
Cross-sectional area (m2)；L is sample length (m)；η is fluid coefficient of viscosity (Pas)；K is permeability (m2)；Δ P be sample on,
The pressure difference (Pa) in downstream.But for hypotonic, Oil in Super-low Permeability rock core, the time that fluid is difficult by or passes through is longer, influences
The accuracy of test.
Pulse attenuation method be by test rock sample one-dimensional and unsteady state flow event in the attenuation data of pore pressure at any time,
And corresponding mathematical model is combined, the accurate answer of percolation equationk and suitable control errors are simplified, so that it may be tested
The pulse calculation model of permeability and method of rock sample.
As shown in Fig. 2, Fig. 2 is the device schematic diagram for testing permeability using pulse attenuation method.Respectively there is an envelope at sample both ends
The container closed i.e. upstream container and downstream reservoir give upper end container when test after tandem container and rock sample internal pressure balance
One pressure pulse.Then upper container pressure will be reduced slowly, and bottom container pressure slowly increases, and monitoring pressure at two ends is at any time
Between situation of change, until container in reach new pressure balance.Upstream and downstream decline of pressure curve can acquire test specimens infiltration
Rate:
Δ p (t) --- rock sample both ends pressure difference measured value；Pi--- inceptive impulse pressure；θ --- attenuation curve slope；Vu、
Vd--- upstream and downstream volume volume
Pulse attenuation method is tested under unstable state, and the testing time is short, and test result is more accurate.But experimental provision is to sealing
Property is more demanding, and experiment condition is harsher.
Thus we have invented a kind of method of new measurement Oil in Super-low Permeability core permeability, solves the above technical problem.
Summary of the invention
The linear flow state that the object of the present invention is to provide a kind of using displacement fluid in rock core, to the pressure measured
Curve carries out double-log derivative processing, carries out curve fitting, to obtain the measurement Oil in Super-low Permeability core permeability of core permeability
Method.
The purpose of the present invention can be achieved by the following technical measures: the method for measurement Oil in Super-low Permeability core permeability, the survey
The method for determining Oil in Super-low Permeability core permeability uses core permeability test device, this method comprises: step 1, test obtains rock
The pore volume of the heart；Step 2, rock core to be measured is packed into core permeability test device；Step 3, displacement pressure P1 is recorded；Step
4, record the drop of pressure data P2 at displacement end；Step 5, data processing is carried out to pressure drop P2, to obtain the permeability of rock core.
The purpose of the present invention can be also achieved by the following technical measures:
In step 1, according to Boyle's law testing rock core pore volume, the i.e. pressure vessel of rock core and a fixed volume
Connection, the container are full of the test gas of certain pressure, measure the pressure before and after the pressure vessel and rock core porosity communication, pass through
The pore volume of formula calculating rock core.
In step 1, the formula of the pore volume of rock core is calculated are as follows:
p1V1=p2(V1+Vp)
p1The gassiness initial pressure of-pressure vessel, MPa；
p2Pressure after-pressure vessel gas and rock core porosity communication, MPa；
V1- pressure vessel volume, cm3；
Vp- rock pore volume, cm3。
Step 1 further includes injecting V in the container of core permeability test devicepThe test liquid of/3 volumes.
In step 2, rock core to be measured is packed into the core holding unit of core permeability test device, opens core permeability
The exhaust-valve of test device empties core entry air in pipeline.
In step 3, after applying simulated formation confining pressure, the constant flow pump of core permeability test device is with constant flow rate Q1 drive
For the fluid in container of core permeability test device, until whole displacements finish, the pressure gauge of core permeability test device
Record displacement pressure P1.
In steps of 5, logarithmic derivative processing, and fitting data curve are carried out for pressure drop P2, to obtain rock core
Permeability.
The method of measurement Oil in Super-low Permeability core permeability in the present invention, is related in a kind of natural petroleum gas field field, right
The measurement method of core permeability is particularly directed to hypotonic, special hypotonic and Oil in Super-low Permeability core permeability measurement method.It should
Based on method is analyzed by Well Testing Theory, testing injection/pressure fall is carried out to rock core, falloff curve is obtained, carries out curve fitting, from
And obtain core permeability.For hypotonic, special hypotonic and Oil in Super-low Permeability, its permeability can be quickly tested；Test method
Simply, calculated result is accurate.
Detailed description of the invention
Fig. 1 is the device schematic diagram that permeability is tested using steady state method；
Fig. 2 is the device schematic diagram that permeability is tested using pulse attenuation method；
Fig. 3 is the structure of a specific embodiment of the device that the method for measurement Oil in Super-low Permeability core permeability of the invention uses
Figure；
Fig. 4 by the present invention foundation schematic illustration；
Fig. 5 is the schematic diagram of a specific embodiment pressure of the invention；
Fig. 6 is the schematic diagram of matched curve in a specific embodiment of the invention；
Fig. 7 is the flow chart of a specific embodiment of the method for measurement Oil in Super-low Permeability core permeability of the invention.
Specific embodiment
To enable above and other objects, features and advantages of the invention to be clearer and more comprehensible, preferably implementation is cited below particularly out
Example, and cooperate shown in attached drawing, it is described in detail below.
As shown in figure 3, the structure chart of the device for the method use of measurement Oil in Super-low Permeability core permeability of the invention.Constant current
Pump 1 provides driving force for whole system.Container 2 fills test liquid, and volume size is adjustable, less than the pore volume of rock core.Pressure
Power meter 3 records core entry end force.Exhaust-valve 4 is opened manually in constant flow pump displacement, empties gas in pipeline.Rock core
Rock core 6 to be measured is housed in clamper 5.Confining pressure device 7 can apply the confining pressure of different requirements to rock core.8 access diffusate of beaker
Body.Computer 9 controls constant flow pump and confining pressure, while recording the pressure data that pressure gauge transmits.
As shown in fig. 7, the flow chart of the method for measurement Oil in Super-low Permeability core permeability of the invention.
In step 101, test obtains the pore volume of rock core
(1) measurement of pore volume: according to Boyle's law testing rock core pore volume, i.e. rock core and a fixed volume
Pressure vessel connection, the container are full of the test gas of certain pressure, before and after measuring the pressure vessel and rock core porosity communication
Pressure is calculated by the following formula the pore volume of rock core
p1V1=p2(V1+Vp)
p1The gassiness initial pressure of-pressure vessel, MPa；
p2Pressure after-pressure vessel gas and rock core porosity communication, MPa；
V1- pressure vessel volume, cm3；
Vp- rock pore volume, cm3。
(2) V is injected in container 2pThe test liquid of/3 volumes.
In step 102, rock core 6 to be measured is packed into core holding unit 5, opens exhaust-valve 4, empties gas in core entry pipeline
Body.
In step 103, after applying simulated formation confining pressure 7, constant flow pump 1 with fluid in constant flow rate Q1 displacement container 2, until
Whole displacements finish, and pressure gauge records displacement pressure P1.
In step 104, keep whole pipelines constant, pressure gauge 3 records the drop of pressure data P2 at displacement end.
In step 105, to the data that step 103 and 104 obtain, logarithmic derivative processing is carried out for pressure drop P2, and
Fitting data curve can obtain the permeability of rock core.
Concrete principle are as follows: fluid flows in rock core, meets the diffusion equation of fluid seepage flow in porous media:
In formula
P: pressure；
R: pressure radius；
Φ: porosity；
μ: fluid coefficient of viscosity；
Ct: system compressibility；
K: permeability；
It is solved are as follows:
In formula:
P (t): landing pressure, that is, P2；
Pi: final injection pressure, that is, P1；
K: core permeability；
H: rock core equivalent thickness；
Q: injection flow, that is, Q1；
μ: for fluid coefficient of viscosity；
B: fluid volume coefficient；
Φ: porosity；
Ct: system compressibility；
rw: pressure diffusion distance；
S: rock core end face skin factor may be considered 0 in experiment.
It is homogeneous that rock core, which can be approximately considered, then the double-log derivative curve of formula (2) is as shown in Figure 4.Pass through fitting
Fig. 4 curve can obtain core permeability.
In one embodiment, a rock core design parameter is as follows:
| Rock core | Parameter | Unit |
| Length | 5.6 | cm |
| Diameter | 2.5 | cm |
| Porosity | 0.015 | |
| Pore volume | 4.12 | cm3 |
| Liquid volume to be implanted | 1.37 | cm3 |
By step 102- step 104, it is as shown in Figure 5 to obtain P1 and P2.By step 105, carry out at double-log derivative
Reason, and be fitted, as shown in Figure 6.To obtain core permeability are as follows: 0.15mdc.
Claims (7)
1. the method for measuring Oil in Super-low Permeability core permeability, which is characterized in that the method for the measurement Oil in Super-low Permeability core permeability uses
Core permeability test device, this method comprises:
Step 1, test obtains the pore volume of rock core；
Step 2, rock core to be measured is packed into core permeability test device；
Step 3, displacement pressure P1 is recorded；
Step 4, the drop of pressure data P2 at displacement end is recorded；
Step 5, data processing is carried out to pressure drop P2, to obtain the permeability of rock core.
2. the method for measurement Oil in Super-low Permeability core permeability according to claim 1, which is characterized in that in step 1, according to
Boyle's law testing rock core pore volume, i.e. rock core are connect with the pressure vessel of a fixed volume, which is full of a level pressure
The test gas of power measures the pressure before and after the pressure vessel and rock core porosity communication, and the pore-body of rock core is calculated by formula
Product.
3. the method for measurement Oil in Super-low Permeability core permeability according to claim 2, which is characterized in that in step 1, calculate
The formula of the pore volume of rock core are as follows:
p1V1=p2(V1+Vp)
p1The gassiness initial pressure of-pressure vessel, MPa；
p2Pressure after-pressure vessel gas and rock core porosity communication, MPa；
V1- pressure vessel volume, cm3；
Vp- rock pore volume, cm3。
4. the method for measurement Oil in Super-low Permeability core permeability according to claim 3, which is characterized in that step 1 further includes,
V is injected in the container of core permeability test devicepThe test liquid of/3 volumes.
5. the method for measurement Oil in Super-low Permeability core permeability according to claim 1, which is characterized in that in step 2, will be to
The core holding unit that rock core is packed into core permeability test device is surveyed, the exhaust-valve of core permeability test device, emptying are opened
Core entry air in pipeline.
6. the method for measurement Oil in Super-low Permeability core permeability according to claim 1, which is characterized in that in step 3, apply
After simulated formation confining pressure, the constant flow pump of core permeability test device is with constant flow rate Q1 displacement core permeability test device
Fluid in container, until whole displacements finish, the pressure gauge of core permeability test device records displacement pressure P1.
7. the method for measurement Oil in Super-low Permeability core permeability according to claim 1, which is characterized in that in steps of 5, for
Pressure drop P2 carries out logarithmic derivative processing, and fitting data curve, to obtain the permeability of rock core.
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Cited By (8)
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| CN110261282A (en) * | 2019-07-23 | 2019-09-20 | 西南石油大学 | A kind of shearing seam shale core impulse attenuation permeability test method |
| CN110530777A (en) * | 2019-09-30 | 2019-12-03 | 中国科学院力学研究所 | A kind of acquisition methods of particulate samples permeability |
| CN112505085A (en) * | 2021-02-05 | 2021-03-16 | 西南石油大学 | Method for measuring porosity effective stress coefficient based on nuclear magnetic resonance |
| CN112834405A (en) * | 2021-01-07 | 2021-05-25 | 中国科学院西北生态环境资源研究院 | Method and device for testing permeability of rock core overburden pressure matrix |
| CN114486674A (en) * | 2022-01-06 | 2022-05-13 | 青岛中石大教育发展有限公司 | Method for rapidly determining permeability on drilling and logging site |
| CN114894693A (en) * | 2022-04-28 | 2022-08-12 | 河南理工大学 | Small-size rock core permeability testing method and device |
| US11598711B2 (en) | 2021-01-07 | 2023-03-07 | Saudi Arabian Oil Company | Method and apparatus for measuring stress dependency of shale permeability with steady-state flow |
| CN116242654A (en) * | 2023-03-16 | 2023-06-09 | 沂源县东里自然资源管理所 | Shale sampling equipment and shale sampling method |
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| CN110261282A (en) * | 2019-07-23 | 2019-09-20 | 西南石油大学 | A kind of shearing seam shale core impulse attenuation permeability test method |
| CN110530777A (en) * | 2019-09-30 | 2019-12-03 | 中国科学院力学研究所 | A kind of acquisition methods of particulate samples permeability |
| CN112834405A (en) * | 2021-01-07 | 2021-05-25 | 中国科学院西北生态环境资源研究院 | Method and device for testing permeability of rock core overburden pressure matrix |
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| CN112505085A (en) * | 2021-02-05 | 2021-03-16 | 西南石油大学 | Method for measuring porosity effective stress coefficient based on nuclear magnetic resonance |
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| CN114894693A (en) * | 2022-04-28 | 2022-08-12 | 河南理工大学 | Small-size rock core permeability testing method and device |
| CN114894693B (en) * | 2022-04-28 | 2023-03-28 | 河南理工大学 | Small-size rock core permeability testing method and device |
| CN116242654A (en) * | 2023-03-16 | 2023-06-09 | 沂源县东里自然资源管理所 | Shale sampling equipment and shale sampling method |
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Application publication date: 20190618 |