CN106153522A - Core porosity measurement apparatus and measuring method - Google Patents
Core porosity measurement apparatus and measuring method Download PDFInfo
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- CN106153522A CN106153522A CN201610707301.7A CN201610707301A CN106153522A CN 106153522 A CN106153522 A CN 106153522A CN 201610707301 A CN201610707301 A CN 201610707301A CN 106153522 A CN106153522 A CN 106153522A
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- 238000005259 measurement Methods 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title claims abstract description 22
- 239000001307 helium Substances 0.000 claims abstract description 21
- 229910052734 helium Inorganic materials 0.000 claims abstract description 21
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims abstract description 21
- 239000011148 porous material Substances 0.000 claims abstract description 15
- 239000011435 rock Substances 0.000 claims abstract description 11
- 239000007789 gas Substances 0.000 claims description 12
- 239000002245 particle Substances 0.000 claims description 7
- 230000001186 cumulative effect Effects 0.000 claims description 6
- 229910001220 stainless steel Inorganic materials 0.000 claims description 6
- 239000010935 stainless steel Substances 0.000 claims description 6
- 238000012360 testing method Methods 0.000 claims description 4
- 230000006835 compression Effects 0.000 claims description 3
- 238000007906 compression Methods 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 230000009977 dual effect Effects 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
Classifications
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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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- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
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- Measuring Fluid Pressure (AREA)
Abstract
The invention discloses a kind of core porosity measurement apparatus, including helium tank, pressure-reducing valve, sample room, reference cell, pressure sensor, digital wash, the first valve, the second valve and the 3rd valve, can realize that helium is introduced into sample room and enters back into reference cell by valve.The invention also discloses a kind of core porosity measuring method, comprise the following steps: (1) calibrates: helium is first introduced sample room dividing potential drop again to reference cell, be calculated reference cell volume Vr and sample room volume Vc by simultaneous equations, repeated multiple times complete calibration；(2) measure: be calculated core porosity by simultaneous equations.First the present invention by introducing sample room by high-tension measurement helium, dividing potential drop is to reference cell again, significantly increase pressure change before and after dividing potential drop, and pressure change reduces with rock pore volume and increases, under the conditions of equivalent devices, use the measurement apparatus of the present invention and measuring method can measure the porosity of core sample especially low-porosity sample more accurately.
Description
Technical field
The present invention relates to a kind of core porosity measurement apparatus and measuring method, particularly relate to a kind of measurement gas and be introduced into sample
Behind product room, dividing potential drop enters core porosity measurement apparatus and the measuring method of reference cell again.
Background technology
The core porosity measuring method of existing domestic and international main flow, main employing oil and gas industry standard SY/T
5336-2006 " core analysis method " (i.e. API RP 40:1998, Recommended Practices for Core
Version introduced in the Chinese of Analysis, IDT) in, 5.3.2.1.1 Boyle law dual chamber method (rock sample cup) measures particle volume
Measure the apparent volume of rule rock core with 5.2.3 kind of calliper method, apparent volume deducts the difference of particle volume divided by apparent volume, i.e.
For porosity.
In theory, said method can measure the regular core sample of arbitrary dimension, any porosity；But in reality
In application, it is necessary to consider that:
During using Robert Boyle dual chamber method to measure particle volume, actual gas pressure is converted to the telecommunications of pressure sensor
Number, and finally transmit the registration of the digital wash being converted to, during a series of conversions, there is error；
Manometric figure place showing is limited, i.e. the limited resolution of pressure-measuring system；
As described in SY/T 5336-2006 5.3.2.1.1.8 f, after rock core and filling block are put in sample room, except the hole of rock core
Outside gap, in sample room and pipeline, there is also system void volume；
As described in SY/T 5336-2006 5.3.2.1.1.8 g, pore volume should be close with reference cell volume, but works as pore-body
When amassing very little, reference cell volume is difficult to and pore volume approximation；
Utilize the essence of Boyle law dual chamber method measurement core porosity, i.e. measure the pressure being caused by rock pore volume and become
Changing, pore volume is more big, and the pressure change being caused by it is bigger；Getting over hour at pore volume relative to reference cell, pressure changes then
Less, the change of error relative pressure is bigger, bigger on measurement result impact.
To sum up, the Boyle law dual chamber method (rock sample cup) that SY/T 5336-2006 recommends measures particle volume, is measuring
During low-porosity sample such as shale (porosity is often 0～2%), measuring result error is relatively big, have impact on follow-up test and research.
Content of the invention
The purpose of the present invention is that provides one measuring low-porosity sample such as shale to solve the problems referred to above
When still there is core porosity measurement apparatus and the measuring method of high-acruracy survey result.
The present invention is achieved through the following technical solutions above-mentioned purpose:
A kind of core porosity measurement apparatus, including helium tank, pressure-reducing valve, sample room, reference cell, pressure sensor and numeral show
Showing table, also including the first valve, the second valve and the 3rd valve, the outlet of described helium tank is with the entrance of described pressure-reducing valve even
Connecing, the outlet of described pressure-reducing valve is connected with the first end of described first valve, the second end of described first valve respectively with described
The test side of the first end of the second valve, the entrance of described sample room and described pressure sensor connects, described second valve
Second end is connected with described first end of the 3rd valve and the entrance of described reference cell respectively, and the second end of described 3rd valve hangs
Sky, the signal output part of described pressure sensor is connected with the signal input part of described digital wash.
The measuring method that a kind of core porosity measurement apparatus as claimed in claim 1 uses, comprises the following steps:
(1) calibrate, specifically include following steps:
(1.1) make helium admission pressure close to the range upper limit of pressure sensor by regulating pressure-reducing valve；
(1.2) open the second valve and the 3rd valve, close after about 30 seconds, the stable registration of record digital wash, it is designated as
Pa1；
(1.3) vacant sample room, opens the first valve, closes the first valve after about 30 seconds, and record shows by stablizing of digital wash
Number, is designated as P1；
(1.4) open the second valve, the stable registration of record digital wash, be designated as P2, close after opening the 3rd valve emptying
Close；
(1.5) sample room loading standard stainless steel filling block as much as possible, filling block cumulative volume is designated as Vf0；
(1.6) open the first valve, close the first valve, the stable registration of record digital wash after about 30 seconds, be designated as P3；
(1.7) open the second valve, the stable registration of record digital wash, be designated as P4, close after opening the 3rd valve emptying
Close；
(1.8) simultaneous equation below:
Obtaining reference cell volume Vr and sample room volume Vc, wherein Za1, Z1, Z2, Z3, Z4 are respectively corresponding pressure when temperature is Ta
Power Pa1, the Gas Compression Factor of helium under P1, P2, P3, P4；Keeping environment conditions constant during measurement, environment temperature is designated as
Ta, and when assuming all pressure readings, in system, gas temperature is Ta；
(1.9) in adjustment sample room, after filling block volume, repetition step (1.5) is to (1.8), and repeated multiple times completing is calibrated；
(2) measure, specifically include following steps:
(2.1) rock core that apparent volume is Vs is put into sample room, and load standard stainless steel filling block as much as possible, filling block
Cumulative volume is designated as Vf1；
(2.2) open the second valve and the 3rd valve, close after about 30 seconds, the stable registration of record digital wash, it is designated as
Pa2；
(2.3) open the first valve, close the first valve, the stable registration of record digital wash after about 30 seconds, be designated as P5；
(2.4) open the second valve, the stable registration of record digital wash, be designated as P6, close after opening the 3rd valve emptying；
(2.5) simultaneous equation below:
%
Obtaining core porosity, wherein Za2, Z5, Z6 are the gas pressure of temperature helium under corresponding pressure Pa2, P5, P6 when being Ta
The contracting factor, Vg is the particle volume of sample, and Vp is the pore volume of sample.
Above-mentioned measurement apparatus and measuring method are mutually corresponding, measurement apparatus of the present invention and traditional measurement apparatus
Defining difference at helium tank in the attachment structure of reference cell and sample room, this architectural difference is formally seen smaller,
But defining substantial variations, this change causes measuring method of the present invention to be implemented smoothly.
The beneficial effects of the present invention is:
First the present invention by introducing sample room by high-tension measurement helium, then dividing potential drop is to reference cell, relative to traditional industry mark
Quasi-method significantly increases pressure change before and after dividing potential drop, and pressure change reduces with rock pore volume and increases, and is setting on an equal basis
Under the conditions of Bei, use the measurement apparatus of the present invention and measuring method can measure core sample especially low-porosity more accurately
The porosity of sample.
Brief description
Fig. 1 is the structural representation of core porosity measurement apparatus of the present invention；
Fig. 2 is structural representation during core porosity measurement apparatus of the present invention application.
Detailed description of the invention
The invention will be further described below in conjunction with the accompanying drawings:
As it is shown in figure 1, core porosity measurement apparatus of the present invention includes helium tank the 1st, pressure-reducing valve the 9th, sample room the 3rd, reference cell
2nd, pressure sensor the 4th, digital wash the 5th, the first valve the 8th, the second valve 7 and the 3rd valve 6, the outlet pressure-reducing valve 9 of helium tank 1
Entrance connect, the outlet of pressure-reducing valve 9 is connected with the first end of the first valve 8, the second end of the first valve 8 respectively with the second valve
First end of door 7, the test side of the entrance of sample room 3 and pressure sensor 4 connect, and the second end of the second valve 7 is respectively with the
The entrance of the first end of three valves 6 and reference cell 2 connects, and the second end of the 3rd valve 6 is unsettled, as emptying end, pressure sensing
The signal output part of device 4 is connected with the signal input part of digital wash 5.In said structure, absolute pressure measured by pressure sensor 4
Power, digital wash 5 at least can show that all significant digits add 1 bit sign position, as measured value should contain 3 reliable digits and 1
Incredible figures, then digital wash 5 should at least show 5；The displacement volume of the first valve the 8th, the second valve 7 and the 3rd valve 6
It is 0.
As in figure 2 it is shown, the measuring method that core porosity measurement apparatus of the present invention uses, comprise the following steps:
(1) calibrate, specifically include following steps:
(1.1) make helium admission pressure close to the range upper limit of pressure sensor 4 by regulating pressure-reducing valve 9；
(1.2) open the second valve 7 and the 3rd valve 6, close after about 30 seconds, the stable registration of record digital wash 5, note
For Pa1；
(1.3) vacant sample room 3, opens the first valve 8, closes the first valve 8 after about 30 seconds, records the steady of digital wash 5
Determine registration, be designated as P1；
(1.4) open the second valve 7, the stable registration of record digital wash 5, be designated as P2, after opening the 3rd valve 6 emptying
Close；
(1.5) sample room 3 loading standard stainless steel filling block as much as possible, filling block cumulative volume is designated as Vf0；
(1.6) open the first valve 8, close the first valve 8, the stable registration of record digital wash 5 after about 30 seconds, be designated as
P3；
(1.7) open the second valve 7, the stable registration of record digital wash 5, be designated as P4, after opening the 3rd valve 6 emptying
Close；
(1.8) simultaneous equation below:
Obtaining reference cell volume Vr and sample room volume Vc, wherein Za1, Z1, Z2, Z3, Z4 are respectively corresponding pressure when temperature is Ta
Power Pa1, the Gas Compression Factor of helium under P1, P2, P3, P4；Keeping environment conditions constant during measurement, environment temperature is designated as
Ta, and when assuming all pressure readings, in system, gas temperature is Ta；
(1.9) in adjustment sample room 3, after filling block volume, repetition step (1.5) is to (1.8), and repeated multiple times completing is calibrated；
(2) measure, specifically include following steps:
(2.1) rock core that apparent volume is Vs is put into sample room 3, and load standard stainless steel filling block as much as possible, fill
Block cumulative volume is designated as Vf1；
(2.2) open the second valve 7 and the 3rd valve 6, close after about 30 seconds, the stable registration of record digital wash 5, it is designated as
Pa2；
(2.3) open the first valve 8, close the first valve 8, the stable registration of record digital wash 5 after about 30 seconds, be designated as
P5；
(2.4) open the second valve 7, the stable registration of record digital wash 5, be designated as P6, close after opening the 3rd valve 6 emptying
Close；
(2.5) simultaneous equation below:
%
Obtaining core porosity, wherein Za2, Z5, Z6 are the gas pressure of temperature helium under corresponding pressure Pa2, P5, P6 when being Ta
The contracting factor, Vg is the particle volume of sample, and Vp is the pore volume of sample.
The marrow of this method is, the volume of air inlet is servo-actuated with pore volume, the pore volume greatly then many dividing potential drops of air inlet
The change of rear pressure is relatively small, and after the few dividing potential drop of the little then air inlet of pore volume, pressure change is relatively large；The volume of conventional method air inlet is
Reference cell volume, after the big dividing potential drop of pore volume, pressure changes greatly, and after the little dividing potential drop of pore volume, pressure change is little.
Above-described embodiment is presently preferred embodiments of the present invention, is not the restriction to technical solution of the present invention, as long as
The technical scheme that can realize on the basis of above-described embodiment without creative work, is regarded as falling into patent of the present invention
Rights protection in the range of.
Claims (2)
1. a core porosity measurement apparatus, including helium tank, pressure-reducing valve, sample room, reference cell, pressure sensor and numeral
Display table, it is characterised in that: also including the first valve, the second valve and the 3rd valve, the outlet of described helium tank subtracts with described
The entrance of pressure valve connects, and the outlet of described pressure-reducing valve is connected with the first end of described first valve, the second of described first valve
End is connected with the test side of the first end of described second valve, the entrance of described sample room and described pressure sensor respectively, institute
The second end stating the second valve is connected with described first end of the 3rd valve and the entrance of described reference cell respectively, described 3rd valve
Second end of door is unsettled, and the signal output part of described pressure sensor is connected with the signal input part of described digital wash.
2. the measuring method that a core porosity measurement apparatus as claimed in claim 1 uses, it is characterised in that: include with
Lower step:
Calibration, specifically includes following steps:
Make helium admission pressure close to the range upper limit of pressure sensor by regulating pressure-reducing valve；
Open the second valve and the 3rd valve, close after about 30 seconds, the stable registration of record digital wash, it is designated as Pa1；
Vacant sample room, opens the first valve, closes the first valve, the stable registration of record digital wash, note after about 30 seconds
For P1；
Open the second valve, the stable registration of record digital wash, be designated as P2, close after opening the 3rd valve emptying；
Sample room loads standard stainless steel filling block as much as possible, and filling block cumulative volume is designated as Vf0；
Open the first valve, close the first valve, the stable registration of record digital wash after about 30 seconds, be designated as P3；
Open the second valve, the stable registration of record digital wash, be designated as P4, close after opening the 3rd valve emptying；
Simultaneous equation below:
Obtaining reference cell volume Vr and sample room volume Vc, wherein Za1, Z1, Z2, Z3, Z4 are respectively corresponding pressure when temperature is Ta
Power Pa1, the Gas Compression Factor of helium under P1, P2, P3, P4；Keeping environment conditions constant during measurement, environment temperature is designated as
Ta, and when assuming all pressure readings, in system, gas temperature is Ta；
In adjustment sample room, after filling block volume, repetition step (1.5) is to (1.8), and repeated multiple times completing is calibrated；
Measurement, specifically includes following steps:
(2.1) rock core that apparent volume is Vs is put into sample room, and load standard stainless steel filling block as much as possible, filling block
Cumulative volume is designated as Vf1；
(2.2) open the second valve and the 3rd valve, close after about 30 seconds, the stable registration of record digital wash, it is designated as
Pa2；
(2.3) open the first valve, close the first valve, the stable registration of record digital wash after about 30 seconds, be designated as P5；
(2.4) open the second valve, the stable registration of record digital wash, be designated as P6, close after opening the 3rd valve emptying；
(2.5) simultaneous equation below:
%
Obtaining core porosity, wherein Za2, Z5, Z6 are the gas pressure of temperature helium under corresponding pressure Pa2, P5, P6 when being Ta
The contracting factor, Vg is the particle volume of sample, and Vp is the pore volume of sample.
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Cited By (8)
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|---|---|---|---|---|
| CN108872045A (en) * | 2018-08-06 | 2018-11-23 | 四川杰瑞泰克科技有限公司 | A kind of measurement method of the broken sample total porosity of shale |
| CN108956943A (en) * | 2018-06-20 | 2018-12-07 | 中国石油天然气股份有限公司 | Method and device for measuring coal rock cleat compression coefficient |
| CN109142680A (en) * | 2018-08-20 | 2019-01-04 | 中国石油天然气股份有限公司 | Coal rock cleat compression coefficient testing device, determining method and system |
| CN110095397A (en) * | 2019-04-26 | 2019-08-06 | 四川杰瑞泰克科技有限公司 | The multi-functional full-automatic shale gas gaging hole porosity measurement method of GRT-1 type and device |
| CN112485175A (en) * | 2020-11-12 | 2021-03-12 | 武汉古生代检测科技有限公司 | Rock porosity measuring method and measuring device |
| CN112540033A (en) * | 2020-11-18 | 2021-03-23 | 中国科学院武汉岩土力学研究所 | Test device for salt deposit sediment void ratio and gas displacement brine |
| CN112964598A (en) * | 2021-02-22 | 2021-06-15 | 科吉思石油技术咨询(北京)有限公司 | Method and device for continuously measuring density and organic carbon content of formation cuttings |
| CN114047105A (en) * | 2021-11-15 | 2022-02-15 | 东北石油大学 | Device and method for testing porosity of high-pressure helium shale |
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| CN109142680A (en) * | 2018-08-20 | 2019-01-04 | 中国石油天然气股份有限公司 | Coal rock cleat compression coefficient testing device, determining method and system |
| CN109142680B (en) * | 2018-08-20 | 2021-06-01 | 中国石油天然气股份有限公司 | Coal rock cleat compression coefficient testing device, determining method and system |
| CN110095397A (en) * | 2019-04-26 | 2019-08-06 | 四川杰瑞泰克科技有限公司 | The multi-functional full-automatic shale gas gaging hole porosity measurement method of GRT-1 type and device |
| CN112485175A (en) * | 2020-11-12 | 2021-03-12 | 武汉古生代检测科技有限公司 | Rock porosity measuring method and measuring device |
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| CN112964598A (en) * | 2021-02-22 | 2021-06-15 | 科吉思石油技术咨询(北京)有限公司 | Method and device for continuously measuring density and organic carbon content of formation cuttings |
| CN114047105A (en) * | 2021-11-15 | 2022-02-15 | 东北石油大学 | Device and method for testing porosity of high-pressure helium shale |
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