CN1226608C - Method for determining compact rock porosity - Google Patents

Method for determining compact rock porosity Download PDF

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Publication number
CN1226608C
CN1226608C CN 02155691 CN02155691A CN1226608C CN 1226608 C CN1226608 C CN 1226608C CN 02155691 CN02155691 CN 02155691 CN 02155691 A CN02155691 A CN 02155691A CN 1226608 C CN1226608 C CN 1226608C
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chamber
rock
porosity
rock sample
hyperbar
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CN 02155691
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CN1508531A (en
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杨胜来
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China University of Petroleum Beijing
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China University of Petroleum Beijing
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Abstract

The present invention discloses a method for measuring the degree of porosity of a compact rock, which at least comprises: a rock sample is put in a measuring device, and is pressurized with a confining pressure pump; high pressure is applied to a high pressure chamber in which the rock sample is put; the pressure value in the high pressure chamber is measured; the pressure value of a low pressure chamber is measured; the high pressure chamber and the low pressure chamber is communicated, and the average pressure value of both chambers is also measured; the pore volume of the rock sample is calculated; the apparent volume of the rock sample is measured and calculated to obtain the degree of porosity of the rock sample. Utilizing the principles that finely rock pores are easy to enter for high pressure gas, and the diffusion from the rock to the outside for the gas is easier than that from the outside to the rock for the gas, the present invention realizes accurate and rapid measurement to pore volumes and the degree of porosity. The present invention has simplified flow procedures and time saving. Firstly, the high pressure gas is firstly injected to the rock sample, and then the gas in the rock sample diffuses to the low pressure chamber, and the diffusion of the gas is easy, so the equilibration time is short, the measurement precision is raised, the dead volume is decreased, and the negative value of the porosity is avoided.

Description

Measure the method for compacted rock factor of porosity
Technical field
The present invention relates to a kind of method of measuring rock porosity, the volume of voids of compacted rock in the low permeability reservoirs and the method for factor of porosity are measured in especially a kind of landing that utilizes pore pressure.
Background technology
The method that can measure the compacted rock factor of porosity at present is a lot, and these basic skills comprise: kerosene method, add wax method and gas method.The measuring process of gas method porosity measuring instrument is such: the container A that at first low-pressure gas is charged into a known volume, open valve then to rock sample chamber B venting, i.e. process (A → B), measure the pressure of venting front and back, utilize boyle law, calculate volume of voids and factor of porosity.This method is big to hole, the higher rock sample of factor of porosity is effectively, because gas is easy to enter in the hole of rock.And the pore diameter of compacted rock is little, gas molecule is not easy to enter hole, it is long to reach the balance required time, and gas is difficult to enter in the hole in rock deep and goes, make the accuracy of measurement data be subjected to very big influence, particularly when the dead volume of instrument is big, the factor of porosity of negative value may occur, this is irrational.Want by measuring the ratio of precision higher data, adopt existing method to be difficult to reach requirement.
Existing gas method porosity determination method is being measured compact rock core, factor of porosity＜10%, air permeability＜1.0 * 10 -3μ m 2Rock the time, have following point:
1, the set circuit of existing measuring method is tediously long, dead volume is big, the negative value factor of porosity can occur to the low-permeability compact rock core, and measurement result is inaccurate.
2, gaseous tension is low in the existing measuring method system, and equilibration time is long, and efficiency of measurement is low, and it is low to measure precision.
3, the set circuit of existing measuring method is tediously long, and little gas leak phenomenon takes place easily in the joint, and is difficult to search, and influences measurement effect.
4, have multiple working procedures such as measuring method need vacuumize, pressurization, balance now, the measuring process complexity, Measuring Time is long.
5, existing measuring method gas is when the rock sample hole spreads, and gaseous tension is low, because gas molecule is difficult to enter the trickle hole of diameter, therefore the equilibration time that needs is long.If equilibration time is not enough, then measuring influences precision.
In the process that rock is measured, solve above-mentioned problems of the prior art, become problem anxious to be solved.
Summary of the invention
The objective of the invention is to propose a kind of method of measuring the compacted rock factor of porosity at the deficiencies in the prior art, under high pressure, gas is easy to enter in the trickle blowhole, and gas air chamber diffusion ratio to known volume from rock spreads to rock easily from air chamber, thereby realizes the measurement accurately and fast to volume of voids, factor of porosity.
The present invention realizes by the following technical solutions:
A kind of method of measuring the compacted rock factor of porosity, this method comprises the steps:
Step 1: rock sample is put into the hyperbar chamber of measurement mechanism, with the pressurization of confined pressure pump; Described measurement mechanism comprises pressurising device, hyperbar chamber, infrabar chamber and pressure tester; Described pressurising device, hyperbar chamber and infrabar chamber are connected by pipeline in turn, and described pressure tester is arranged between hyperbar chamber and the infrabar chamber, and pipeline is provided with valve;
Step 2: add high pressure to the hyperbar chamber that rock sample is housed;
Step 3: the pressure value P of measuring the hyperbar chamber High
Step 4: the pressure value P of measuring the infrabar chamber Low
Step 5: be communicated with hyperbar chamber and infrabar chamber, and measure its average pressure value P Eqv
Step 6: according to the volume of voids of following formula computing rock sample:
P lowV o+P high(V p+V d)＝P eqv(V o+V p+V d)
V p = ( P eqv - P low ) V 0 - ( P high - P eqv ) V d P high - P eqv
Wherein, V oBe infrabar chamber volume;
V dBe the pipeline dead volume;
V pVolume of voids for rock sample;
Step 7: measure the also apparent volume V of computing rock sample Bulk, then the rock sample factor of porosity is:
φ = V p V bulk .
The confined pressure that applies to rock sample is 5.0-6.OMPa; The gas atmosphere that charges into to the hyperbaric chamber is 4-5MPa.
Carry out in above-mentioned step 3, step 4, the step 5 will passing through equilibration time before the pressure survey, equilibration time is 2-5 minute.
Wherein, the hyperbar chamber volume in the described measurement mechanism is 1-8cm 3Described hyperbar chamber be shaped as right cylinder or cube.
Described pressurising device is the source of the gas bottle, and its pressure that charges into to the hyperbar chamber is 4-5MPa; Described valve is more than one, is located at infrabar chamber, pressure tester, hyperbar chamber and pressurising device respectively and is connected on the adjacent two-part pipeline.Described valve is the multiport valve that is arranged between infrabar chamber and the hyperbar chamber, combines with pressure tester.
In sum, the present invention has following advantage:
Because gases at high pressure at first inject rock sample, the gas in the rock sample spreads to low-pressure chamber then, and gas spreads easily so equilibration time is short, measures precision and improves.
Reduced dead volume, avoided occurring the negative value of factor of porosity, improved and measure precision.
Simplified flow process, saved and vacuumize, operation steps reduces by a step, has saved the time.
The present invention utilizes gases at high pressure to be easy to enter in the trickle blowhole and gas spreads easy principle to extraneous diffusion ratio to rock from the external world from rock, thereby realizes the measurement accurately and fast to volume of voids, factor of porosity.
Description of drawings
Fig. 1 is the structural scheme of mechanism of the embodiment of the invention one;
Fig. 2 is the structural scheme of mechanism of the embodiment of the invention two.
Embodiment
Below in conjunction with accompanying drawing technical scheme of the present invention is described further.
Embodiment one:
As shown in Figure 1, be the structural representation of the embodiment of the invention one, as we know from the figure, A is standard volume air chamber (the volume 1-8cm of known volume 3), i.e. infrabar chamber; B is the hyperbar chamber, and tested rock sample is placed among the B of hyperbar chamber, therefore can be described as clamper again; C is the pressurising device, can adopt the source of the gas bottle, is used for to the B pressurising of hyperbar chamber; D is a pressure tester, can adopt tensimeter, is used for measuring under different situations, is placed with the interior atmospheric pressure value of hyperbar chamber B of tested rock sample; E is the confined pressure pump, and 1,2,3,4 is the more than one valve that is provided with on the pipeline, is used for controlling air flow direction.Being located at infrabar chamber A, pressure tester D, hyperbar chamber B and pressurising device C respectively is connected on the adjacent two-part pipeline.
As shown in Figure 1, measuring factor of porosity realizes by following operation steps:
Step 1: cylindrical rock sample is placed hyperbar chamber B, start confined pressure pump E adds 5.0-6.0MPa (absolute pressure) to rock sample confined pressure;
Step 2: valve-off 2, open valve 3,4, from pressurising device C be that the gases at high pressure of 4-5MPa (absolute pressure) charge into hyperbar chamber B with pressure, valve-off 3 after 2-5 minute.Record pressure by pressure tester (tensimeter) D after balance 2-3 minute, be designated as P High
Step 3: opening valve 1, to make the standard volume chamber be that infrabar chamber A connects atmosphere, and by other atmospheric pressure instrumentation surely the atmospheric pressure of this moment be designated as P LowValve-off 1;
Step 4: open valve 2, the gases at high pressure in the B of hyperbar chamber are spread in the A of infrabar chamber, measure mean pressure P after balance 3-5 minute Eqv
Step 5: utilize the measured data of above-mentioned steps to calculate, computing method are as follows:
P lowV o+P high(V p+V d)＝P eqv(V o+V p+V d)
Wherein, each pressure should be scaled absolute pressure in the formula;
V pVolume of voids for rock sample;
V oFor the standard volume chamber is the volume of infrabar chamber A, for known;
V dBe the pipeline dead volume;
Can obtain V by above-mentioned formula p:
V p = ( P eqv - P low ) V 0 - ( P high - P eqv ) V d P high - P eqv ;
Step 7: measure the physical dimension of rock sample with vernier caliper, and calculate its apparent volume V Bulk,
Then
The rock sample factor of porosity is: φ = V p V bulk
The gas that present embodiment filled is high-purity high pressure (＞4MPa) N 2
The present invention has utilized under high pressure, and gas is easy to enter in the trickle blowhole, and, (B → A) is than (A → B) is diffusion principle easily, realizes the measurement accurately and fast to volume of voids, factor of porosity to rock B from extraneous A to extraneous A diffusion from rock B for gas.
Embodiment two:
As shown in Figure 2, be the structural representation of the embodiment of the invention two.As we know from the figure, valve F is the multiport valve that is combined by valve among the embodiment one 1,2,3, realize the multiple function of valve 1,2,3 among the embodiment one, and multiport valve F is connected with pressure tester (tensimeter) D.
The technical scheme of embodiment two is except that above-mentioned part and embodiment one are different, and the other technologies feature is all identical with embodiment one, referring to embodiment one described content, does not repeat them here.
It should be noted that at last: above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although the present invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement technical scheme of the present invention, and not breaking away from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.

Claims (9)

1, a kind of method of measuring the compacted rock factor of porosity, it is characterized in that: this method comprises the steps:
Step 1: rock sample is put into the hyperbar chamber of measurement mechanism, with the pressurization of confined pressure pump; Described measurement mechanism comprises pressurising device, hyperbar chamber, infrabar chamber and pressure tester; Described pressurising device, hyperbar chamber and infrabar chamber are connected by pipeline in turn, and described pressure tester is arranged between hyperbar chamber and the infrabar chamber, and pipeline is provided with valve;
Step 2: add high pressure to the hyperbar chamber that rock sample is housed;
Step 3: the pressure value P of measuring the hyperbar chamber High
Step 4: the pressure value P of measuring the infrabar chamber Low
Step 5: be communicated with hyperbar chamber and infrabar chamber, and measure its average pressure value P Eqv
Step 6: according to the volume of voids of following formula computing rock sample:
P lowV 0+P high(V P+V d)＝P eqv(V 0+V P+V d)
V p = ( P eqv - P low ) V 0 - ( P high - P eqv ) V d P high - P eqv
Wherein, V 0Be infrabar chamber volume;
V dBe the pipeline dead volume;
V pVolume of voids for rock sample;
Step 7: measure the also apparent volume V of computing rock sample Bulk, then the rock sample factor of porosity is:
φ = V p V bulk .
2, the method for mensuration compacted rock factor of porosity according to claim 1 is characterized in that: the confined pressure that applies to rock sample is 5.0-6.0MPa.
3, the method for mensuration compacted rock factor of porosity according to claim 1 is characterized in that: the gas atmosphere that charges into to the hyperbaric chamber is 4-5MPa.
4, the method for mensuration compacted rock factor of porosity according to claim 1 is characterized in that: carry out will passing through equilibration time before the pressure survey in step 3, step 4, step 5, equilibration time is 2-5 minute.
5, the method for mensuration compacted rock factor of porosity according to claim 1 is characterized in that: described hyperbar chamber volume is 1-8cm 3
6, measure the method for compacted rock factor of porosity according to claim 1 or 5, it is characterized in that: described hyperbar chamber be shaped as right cylinder or cube.
7, the method for mensuration compacted rock factor of porosity according to claim 1 is characterized in that: described pressurising device is the source of the gas bottle, and its pressure that charges into to the hyperbar chamber is 4-5MPa.
8, the method for mensuration compacted rock factor of porosity according to claim 1 is characterized in that: described valve is more than one, is located at infrabar chamber, pressure tester, hyperbar chamber and pressurising device respectively and is connected on the adjacent two-part pipeline.
9, the method for mensuration blowhole according to claim 1 is characterized in that: described valve is to be arranged between infrabar chamber and the hyperbar chamber and the multiport valve that is connected with pressure tester.
CN 02155691 2002-12-13 2002-12-13 Method for determining compact rock porosity Expired - Fee Related CN1226608C (en)

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Application Number Priority Date Filing Date Title
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CN1226608C true CN1226608C (en) 2005-11-09

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Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102323199B (en) * 2011-08-09 2014-02-05 中国石油天然气股份有限公司 Porosity determination experiment design method and system
CN102353625B (en) * 2011-08-31 2013-11-06 中国石油大学(北京) Method for measuring overburden porosity with water in permeation fluid mechanics experiment
CN102359930B (en) * 2011-09-19 2013-06-05 西安公路养护技术工程研究中心有限公司 Test method for porosity of asphalt mixture, and apparatus thereof
CN102608012A (en) * 2012-03-01 2012-07-25 首钢总公司 Method for calculating porosity of sinter bed
CN103063557B (en) * 2012-12-31 2015-08-19 河海大学 A kind of rock gas penetration test device and assay method
CN103175765B (en) * 2013-03-25 2015-06-17 南通市飞宇石油科技开发有限公司 Low-porosity measurer
CN103207137A (en) * 2013-04-08 2013-07-17 河海大学 Device for fully automatically measuring penetration rate and void ratio of compact rock under dynamic confining pressure
CN103674804A (en) * 2013-11-25 2014-03-26 河海大学 Device and method for measuring effective porosity of low-permeability rock on basis of inert gas experiment
CN104655545A (en) * 2015-03-19 2015-05-27 哈尔滨工业大学 Method for measuring void ratio of macadam mixture
CN107167407A (en) * 2016-03-07 2017-09-15 中国石油化工股份有限公司 A kind of rock porosity determines device
CN109115667B (en) * 2018-09-20 2021-08-03 中国石油天然气股份有限公司 Rock porosity determination method and system
CN113984625B (en) * 2021-10-29 2024-04-09 西南石油大学 Device for measuring porosity of shale reservoir

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