CN106872328A - A kind of test device and method of testing of flow in low permeability core porosity and permeability - Google Patents
A kind of test device and method of testing of flow in low permeability core porosity and permeability Download PDFInfo
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- CN106872328A CN106872328A CN201611230822.4A CN201611230822A CN106872328A CN 106872328 A CN106872328 A CN 106872328A CN 201611230822 A CN201611230822 A CN 201611230822A CN 106872328 A CN106872328 A CN 106872328A
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- 230000035699 permeability Effects 0.000 title claims abstract description 52
- 238000012360 testing method Methods 0.000 title claims abstract description 44
- 238000010998 test method Methods 0.000 title claims abstract description 9
- 238000005086 pumping Methods 0.000 claims abstract description 11
- 239000011435 rock Substances 0.000 claims description 44
- 238000000034 method Methods 0.000 claims description 5
- 238000011144 upstream manufacturing Methods 0.000 claims description 5
- 238000005259 measurement Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 238000009738 saturating Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/082—Investigating permeability by forcing a fluid through a sample
- G01N15/0826—Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/088—Investigating volume, surface area, size or distribution of pores; Porosimetry
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Abstract
The invention discloses a kind of test device and method of testing of flow in low permeability core porosity and permeability, test device includes source of the gas, buffer container, vavuum pump, core holding unit, confined pressure control device and gas flow metering device, described source of the gas is provided with and is connected with buffer container by main air inlet pipe road, described buffer container is connected by clamper air inlet pipeline with the arrival end of core holding unit, described vavuum pump is connected by vacuum-pumping pipeline with buffer container, described confined pressure control device is by confined pressure pipeline and the confined pressure orifice of core holding unit, described gas flow metering device is connected by outlet pipe with the port of export of core holding unit.The present invention is intended to provide a kind of test device and method of testing of the gaseous porosity and permeability for accurately and efficiently determining flow in low permeability core.
Description
Technical field
The invention belongs to oil exploration and development fields, more particularly to a kind of test of flow in low permeability core porosity and permeability
Device and method of testing.
Background technology
With the sustainable growth of world's Demand of Oil ＆ Gas, conventional gas and oil yield constantly declines, and unconventionaloil pool is increasingly becoming entirely
The new highlight of ball petroleum exploration and development, fine and close oil-gas reservoir and shale oil-gas reservoir are even more has captured important angle in global energy structure
Color.
Porosity, permeability characterize the ability of reservoir collection oil gas and migration oil gas respectively, are reserves and evaluating production capacity
Important parameter.And fine and close oil-gas reservoir and shale oil-gas reservoir porosity, permeability are low, the evaluating apparatus of conventional reservoir are uncomfortable to it
With.Therefore, how accurately and efficiently to determine the porosity of the flow in low permeability core such as fine and close oil-gas reservoir, shale oil-gas reservoir, permeability into
It is problem in the urgent need to address.
Boyle law is based on the current test to porosity more, and the test of permeability then has steady state method and cold store enclosure
Two kinds.When testing the gas permeability of flow in low permeability core using steady state method and corresponding intrument, the gas flow by rock core is small, surely
Fix time length, the gas flow error of artificial measurement is larger；Using cold store enclosure test flow in low permeability core gas permeability again
Preparation requirement to instrument and sample is strict.Also, a set of equipment can only measure a parameter, for example, porosity can only be used
Instrument measures porosity, permeability is measured using permeameter, for flow in low permeability core porosity, permeability under different stress
Test then needs separately to carry out, and not only wastes the time, and rock core is also destroyed in the process pore structure of repeated loading, unloading.
The content of the invention
The present invention is to overcome above-mentioned deficiency of the prior art, there is provided one kind accurately and efficiently determines hyposmosis
The gaseous porosity of rock core and the test device of permeability and method of testing.
To achieve these goals, the present invention uses following technical scheme：
A kind of test device of flow in low permeability core porosity and permeability, including the clamping of source of the gas, buffer container, vavuum pump, rock core
Device, confined pressure control device and gas flow metering device, described source of the gas are provided with and are connected with buffer container by main air inlet pipe road,
Described buffer container is connected by clamper air inlet pipeline with the arrival end of core holding unit, and described vavuum pump is true by taking out
Blank pipe road is connected with buffer container, and described confined pressure control device is connected by confined pressure pipeline with the confined pressure interface of core holding unit
Logical, described gas flow metering device is connected by outlet pipe with the port of export of core holding unit.
Preferably, described source of the gas includes gas cylinder and the source of the gas valve being arranged at the top of gas cylinder, it is described
Main air inlet pipe curb source of the gas to the direction of buffer container is sequentially provided with pressure-reducing valve, intake valve and upstream pressure table.
Preferably, described clamper air inlet pipeline is provided with stop valve.
Preferably, described vacuum-pumping pipeline is provided with evacuation valve.
Preferably, described outlet pipe is sequentially provided with down along the direction of core holding unit to gas flow metering device
Trip pressure gauge and needle valve.
Preferably, the buffer container includes cylinder body and the cylinder cap being detachably connected with cylinder body, the bottom of the cylinder body
End seal is closed, and cylinder body top seals with cylinder cap and coordinates, and at least one is provided with described cylinder body for changing buffer container volume
Filling block.
Preferably, first interface, second interface, the 3rd interface are sequentially provided with described cylinder cap from left to right, it is described
First interface and main air inlet pipe road connect, described second interface is connected with clamper air inlet pipeline, the 3rd described interface
Connected with vacuum-pumping pipeline.
A kind of method of testing of flow in low permeability core porosity and permeability, comprises the following steps：
A. the length L and diameter d of rock core are measured, rock core is put into core holding unit；
B. confined pressure is loaded to core holding unit, the confined pressure of setting is higher by 0.5MPa, sets rock core than initial pressure in buffer container
Clamper outlet pressures pL is less than core holding unit inlet port pressure；
C. test device is vacuumized, 600Pa is reached to vacuum pressure；
D. the output pressure of regulation source of the gas is air inlet after pL, makes the pressure in core holding unit be pL；
E. test temperature as 25 DEG C is set, constant temperature two hours keeps the pressure in core holding unit for pL；
F. the output pressure of regulation source of the gas is 0.6MPa, the pressure in buffer container is risen to 0.6MPa；
G. the air inlet of source of the gas, the initial pressure pin of record buffer container are stopped；
H. the pressure p 0 of record buffer container, a data are recorded in equal time interval, draw p0-t relation curves；
I. calculate pressure not in the same time in buffer container, and with the p0-t relation curves fitting surveyed in step h, draw test
The rock core clancy behavior scale of rock core.
Preferably, in step i, the pressure in buffer container in the same time is calculated not by formula (1),
In formula, p0Pressure in-buffer container, atm；- n the moment enters the mass flow of rock core, kg/s from core entry end；V-
Buffer container volume, m3；M- tests the molal weight of gas, kg/kmol；Z- tests the compressibility factor of gas；R- argoshields
Constant, R=0.08314atmm3/(kmol·K)；T- absolute temperature, K；Dt- time steps；
Subscript represents the value at the n-th moment, subscript represent using point-centered grid by j-th grid of the timesharing such as rock core m (j=0~
m)；By the mass flow Q of rock core in any time formula (1)0Tried to achieve by formula (2)：
In formula, k∞The clancy behavior scale of-rock core, 10-3μm2；The b- gas slip factors, atm；A- core sections are accumulated, A=π d2/ 4,
m2；Dx- Gridding lengths, m；μ-gas viscosity, mPs；
Pressure is p in initial time (n=0) buffer containerin,By the gaseous mass of rock core
Flow is：
Can obtain the pressure in Δ t arrival end buffer container for people's formula (1) is：
Meet in j=1 to j=n-1 grid：
In formula,φ-core porosity, %；By equation group (5)
Obtain p1, p2..., pn-1In the pressure value of Δ t；
Repeat above-mentioned calculating, you can obtain not p in the same time0, p1, p2..., pm-1In i Δs t, (i=1,2 ..., n) value at moment, paints
P processed0- t relation curves, adjust k∞Size, until curve fit error reaches requirement, the rock core kirschner for obtaining testing rock core is oozed
Saturating rate, passes throughFormula obtains slip factor.
The beneficial effects of the invention are as follows：(1) flow in low permeability core porosity, permeability test is carried out simultaneously, has saved test
Time；(2) rock core loading and unloading number of times are reduced, it is to avoid rock core pore structure is corrupted such that measurement result is more accurate.
Brief description of the drawings
Fig. 1 is a kind of structural representation of test device of the present invention.
In figure：Gas cylinder 1, source of the gas valve 11, pressure-reducing valve 12, intake valve 13, buffer container 2, filling block 21, vavuum pump 3,
Evacuation valve 31, core holding unit 4, upstream pressure table 41, stop valve 42, downstream pressure table 43, needle valve 44, confined pressure control device
5, gas flow metering device 6.
Specific embodiment
The present invention will be further described with reference to the accompanying drawings and detailed description.
In embodiment as shown in Figure 1, a kind of test device of flow in low permeability core porosity and permeability, including source of the gas,
Buffer container 2, vavuum pump 3, core holding unit 4, confined pressure control device 5 and gas flow metering device 6.Wherein, source of the gas includes
Gas cylinder 1 and the source of the gas valve 11 being arranged at the top of gas cylinder, the outlet of source of the gas valve are provided with by main air inlet pipe Lu Yuhuan
Rush reservoir.Main air inlet pipe curb source of the gas to the direction of buffer container is sequentially provided with pressure-reducing valve 12, intake valve 13 and upstream pressure
Power table 41, pressure-reducing valve is used to reduce the gas pressure from source of the gas to preset pressure, and intake valve is used to control main air inlet pipe road
Break-make, upstream pressure table is then used to detect the pressure in buffer container.
Buffer container is connected by clamper air inlet pipeline with the arrival end of core holding unit, is set on clamper air inlet pipeline
There is stop valve 42, be controlled for the break-make to clamper air inlet pipeline.Vavuum pump passes through vacuum-pumping pipeline and buffer container
Connection, vacuum-pumping pipeline is provided with evacuation valve 31, and evacuation valve is used to be controlled the break-make of vacuum-pumping pipeline, in order to vacuum
Pump carries out vacuum pumping.Confined pressure control device is by confined pressure pipeline and the confined pressure orifice of core holding unit, confined pressure control
Device includes confined pressure pump and confined pressure control valve, and confined pressure is loaded to core holding unit by the controllable confined pressure pump of confined pressure control valve.This
The port of export of outer core holding unit is provided with back pressure control device, and back pressure control device includes back pressure control valve and backpressure pump, passes through
The controllable backpressure pump of back pressure control valve loads back pressure to core holding unit.Gas flow metering device passes through outlet pipe and rock core
The port of export connection of clamper.Outlet pipe is sequentially provided with downstream and presses along the direction of core holding unit to gas flow metering device
Power table 43 and needle valve 44, downstream pressure table are used to detect the pressure in core holding unit that needle valve to be used to control outlet pipe
Break-make.
Buffer container includes cylinder body and the cylinder cap that is detachably connected with cylinder body, the bottom end closure of cylinder body, cylinder body top with
Cylinder cap sealing coordinates, and at least one is provided with cylinder body is used to change the filling block 21 of buffer container volume.On cylinder cap from left to right
It is sequentially provided with first interface, second interface, the 3rd interface, first interface and the connection of main air inlet pipe road, second interface and clamper
Air inlet pipeline is connected, and the 3rd interface is connected with vacuum-pumping pipeline.
A kind of method of testing of flow in low permeability core porosity and permeability, comprises the following steps：
A. the length L and diameter d of rock core are measured, rock core is put into core holding unit；
B. the confined pressure control valve in confined pressure control device is opened, confined pressure pump is adjusted, confined pressure is loaded to core holding unit, set confined pressure
0.5MPa is higher by than the initial pressure in buffer container, back pressure control valve is opened, regulation backpressure pump gives back-pressure valve on-load pressure, if
Determine outlet port of rock core holder pressure pL, outlet port of rock core holder pressure pLInlet port pressure should be less than, be such as set to
0.2MPa；
C. source of the gas valve is closed, intake valve, needle valve is opened, test device is vacuumized using vavuum pump, reached to vacuum pressure
After 600Pa, needle valve is closed, close vavuum pump；
D. gas cylinder is opened, by the valve regulation gas cylinder output pressure that depressurizes for pL, source of the gas valve is opened, enter gas slow
Rush container and core holding unit；
E. it is 25 DEG C by incubator set point experimental temperature, constant temperature two hours closes source of the gas valve, now core holding unit and buffering are held
Pressure is initial pressure p in deviceL；
F. intake valve is closed, by the valve regulation gas cylinder output pressure that depressurizes for 0.6MPa, makes buffer container initial pressure liter
To 0.6MPa；
G. source of the gas valve is closed, intake valve is opened, buffer container pressure now is designated as the initial pressure p of buffer containerin；
H. the pressure p of record buffer container0, a data were recorded every 10 seconds, 100 data points are gathered altogether, draw p0- t relations
Curve；
I. consult《Physical chemistry handbook》(Yao Yunbin writes, Shanghai science tech publishing house, 1985) gas and the absolute of steam glue
Degrees of data table obtains testing viscosity, mu of the gas under test temperature, pressure；
Assuming that the clancy behavior scale of testing rock core is k∞, the statistics tested by steady state method obtains the gas slip factor of rock core and isCalculate pressure not in the same time in buffer container by formula (1), and with the drop of pressure curve matching of actual measurement.
In formula, p0Pressure in-buffer container, atm；- n the moment enters the mass flow of rock core, kg/s from core entry end；
V- buffer container volumes, m3；M- tests the molal weight of gas, kg/kmol；Z- tests the compressibility factor of gas；The general gas of R-
Body constant, R=0.08314atmm3/(kmol·K)；T- absolute temperature, K；Dt- time steps；
Subscript represents the value at the n-th moment, subscript represent using point-centered grid by j-th grid of the timesharing such as rock core m (j=0~
m)；By the mass flow Q of rock core in any time formula (1)0Tried to achieve by formula (2)：
In formula, k∞The clancy behavior scale of-rock core, 10-3μm2；The b- gas slip factors, atm；A- core sections are accumulated, A=π d2/ 4,
m2；Dx- Gridding lengths, m；μ-gas viscosity, mPs；
Pressure is p in initial time (n=0) buffer containerin,By the gaseous mass of rock core
Flow is：
Can obtain the pressure in Δ t arrival end buffer container for people's formula (1) is：
Meet in j=1 to j=n-1 grid：
In formulaφ-core porosity, %, are obtained by equation group (5)
To p1, p2..., pn-1In the pressure value of Δ t；
Repeat above-mentioned calculating, you can obtain not p in the same time0, p1, p2..., pm-1In i Δs t, (i=1,2 ..., n) value at moment, paints
P processed0- t relation curves, adjust k∞Size, until curve fit error reaches requirement, the rock core kirschner for obtaining testing rock core is oozed
Saturating rate, passes throughFormula obtains slip factor.
Claims (9)
1. a kind of test device of flow in low permeability core porosity and permeability, it is characterized in that, including it is source of the gas, buffer container (2), true
Empty pump (3), core holding unit (4), confined pressure control device (5) and gas flow metering device (6), described source of the gas are provided with and pass through
Main air inlet pipe road connects with buffer container (2), and described buffer container (2) is by clamper air inlet pipeline and core holding unit
(4) arrival end connection, described vavuum pump (3) is connected by vacuum-pumping pipeline with buffer container (2), described confined pressure control
Device (5) is led to by confined pressure pipeline and the confined pressure orifice of core holding unit (4), described gas flow metering device (6)
Outlet pipe is crossed to be connected with the port of export of core holding unit (4).
2. the test device of a kind of flow in low permeability core porosity and permeability according to claim 1, it is characterized in that, it is described
Source of the gas include gas cylinder (1) and the source of the gas valve (11) that is arranged at the top of gas cylinder (1), described main air inlet pipe curb
Source of the gas to the direction of buffer container (2) is sequentially provided with pressure-reducing valve (12), intake valve (13) and upstream pressure table (41).
3. the test device of a kind of flow in low permeability core porosity and permeability according to claim 1, it is characterized in that, it is described
Clamper air inlet pipeline be provided with stop valve (42).
4. a kind of test device of the flow in low permeability core porosity and permeability according to claim 1 or 2 or 3, its feature
It is that described vacuum-pumping pipeline is provided with evacuation valve (31).
5. a kind of test device of the flow in low permeability core porosity and permeability according to claim 1 or 2 or 3, its feature
It is that described outlet pipe is sequentially provided with downstream pressure table along core holding unit (4) to the direction of gas flow metering device (6)
And needle valve (44) (43).
6. a kind of test device of the flow in low permeability core porosity and permeability according to claim 1 or 2 or 3, its feature
It is, the cylinder cap that the buffer container (2) is detachably connected including cylinder body and with cylinder body, the bottom end closure of the cylinder body, cylinder body
Top seals with cylinder cap and coordinates, and at least one is provided with described cylinder body is used to change the filling block of buffer container (2) volume
(21)。
7. the test device of a kind of flow in low permeability core porosity and permeability according to claim 6, it is characterized in that, it is described
Cylinder cap on be sequentially provided with first interface, second interface, the 3rd interface from left to right, described first interface and main air inlet pipe road
Connect, described second interface is connected with clamper air inlet pipeline, the 3rd described interface is connected with vacuum-pumping pipeline.
8. a kind of method of testing of flow in low permeability core porosity and permeability, it is characterised in that comprise the following steps：
A. the length L and diameter d of rock core are measured, rock core is put into core holding unit；
B. confined pressure is loaded to core holding unit, the confined pressure of setting is higher by 0.5MPa, sets rock core than initial pressure in buffer container
Clamper outlet pressures pLLess than core holding unit inlet port pressure；
C. test device is vacuumized, 600Pa is reached to vacuum pressure；
D. the output pressure of regulation source of the gas is pLAir inlet afterwards, makes the pressure in core holding unit be pL；
E. test temperature as 25 DEG C is set, constant temperature two hours keeps the pressure in core holding unit for pL；
F. the output pressure of regulation source of the gas is 0.6MPa, the pressure in buffer container is risen to 0.6MPa；
G. the air inlet of source of the gas, the initial pressure p of record buffer container are stoppedin；
H. the pressure p of record buffer container0, a data are recorded in equal time interval, draw p0- t relation curves；
I. calculate pressure not in the same time in buffer container, and with the p that surveys in step h0- t relation curves are fitted, and draw test
The rock core clancy behavior scale of rock core.
9. the method for testing of a kind of flow in low permeability core porosity and permeability according to claim 8, it is characterized in that, step
In i, the pressure in buffer container in the same time is calculated not by formula (1),
In formula, p0Pressure in-buffer container, atm；Moment enters the mass flow of rock core, kg/s from core entry end；
V- buffer container volumes, m3；M- tests the molal weight of gas, kg/kmol；Z- tests the compressibility factor of gas；The general gas of R-
Body constant, R=0.08314atmm3/(kmol·K)；T- absolute temperature, K；Dt- time steps；
Subscript represents the value at the n-th moment, subscript represent using point-centered grid by j-th grid of the timesharing such as rock core m (j=0~
m)；
By the mass flow Q of rock core in any time formula (1)0Tried to achieve by formula (2)：
In formula, k∞The clancy behavior scale of-rock core, 10-3μm2；The b- gas slip factors, atm；A- core sections are accumulated, A=π d2/ 4,
m2；Dx- Gridding lengths, m；μ-gas viscosity, mPs；
Pressure is p in initial time (n=0) buffer containerin,By the gas of rock core
Mass flow is：
Can obtain the pressure in Δ t arrival end buffer container for people's formula (1) is：
Meet in j=1 to j=n-1 grid：
In formulaφ-core porosity, %, are obtained by equation group (5)
To p1, p2..., pn-1In the pressure value of Δ t；
Repeat above-mentioned calculating, you can obtain not p in the same time0, p1, p2..., pm-1I Δs t (i=1,2 ..., n) the value at moment,
Draw p0- t relation curves, adjust k∞Size, until curve fit error reaches requirement, obtain the rock core kirschner of testing rock core
Permeability, passes throughFormula obtains slip factor.
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| CN107167413A (en) * | 2017-06-26 | 2017-09-15 | 中国石油大学(北京) | A kind of compact rock core apparent permeability test device and method of testing |
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| CN108982333A (en) * | 2018-10-18 | 2018-12-11 | 四川富利斯达石油科技发展有限公司 | A kind of gas survey core porosity device |
| CN109540758A (en) * | 2018-11-02 | 2019-03-29 | 上海交通大学 | It is a kind of for studying the experimental provision of gas flow characteristic in porous structure |
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| CN110595982A (en) * | 2019-10-15 | 2019-12-20 | 贵州大学 | Testing device and calculating method for anisotropic permeability of rock gas |
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| US10801943B2 (en) | 2017-06-26 | 2020-10-13 | China University Of Petroleum-Beijing | Apparatus and method for measuring apparent permeability of tight rock core |
| 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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| 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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