GB/T 29171-2023Rock capillary pressure measurement (English PDF)
岩石毛管压力曲线的测定
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
September 7, 2023
Implementation date
January 1, 2024
Scope
GB/T 29171-2023 is the English-translated version of 岩石毛管压力曲线的测定.
GB/T 29171-2023 describes how the capillary pressure curve of a rock sample is measured.
It gives the principle, the measuring instruments and their technical indicators, the test steps and the data processing for three methods - mercury intrusion, at constant pressure and at constant rate, the centrifuge method and the semi-permeable partition method - and states the characteristics and the limitations of each, together with the rounding of the rock structure parameters and the content and format of the report.
An annex shows how pore structure parameters such as the average throat radius, the sorting coefficient and the skewness are worked out from a mercury intrusion curve.
It applies to cemented cores, and it cites GB/T 29172 and SY/T 6014. It replaces GB/T 29171-2012, was issued on 7 September 2023 and has applied since 1 January 2024.
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Document preview — GB/T 29171-2023
National Standard of the People's Republic of China
- ICS
- 75.020
- Classification
- E 12
- Replacing
- GB/T 29171-2012
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- Preface
- 1 Scope
- 2 Normative reference documents
- 3 Terms and Definitions
- 4 Mercury porosimetry
- 4.1 Principle
- 4.2 Measuring instruments
- 4.3 Test step
- 4.4 Test data processing
- 4.5 Characteristics and limitations of mercury porosimetry capillary pressure curve determination method
- 5 Centrifuge method
- 5.1 Principle
- 5.2 Measuring instruments
- 5.3 Test step
- 5.4 Test data processing
- 5.5 Characteristics and limitations of the centrifuge method for measuring capillary pressure curve
- 6 Semi-permeable partition method
- 6.1 Principle
- 6.2 Measuring instruments
- 6.3 Test step
- 6.4 Test data processing
- 6.5 Characteristics and limitations of the semi-permeable partition method for measuring capillary pressure curve
- 7 Data rounded to approximately
- 8 Report content and format
- Appendix A (informative) Calculation of rock pore structure characteristic parameters using mercury intrusion method capillary pressure curve
- A.1 Average throat radius
- A.2 Average pore radius
- A.3 Average pore-throat ratio (eta)
- A.4 Average pore throat radius
- A.5 Contribution rate of a single throat to permeability
- A.6 Sorting coefficient (Sp)
- A.7 Skewness (Skp)
- A.8 Kurtosis (Kp)
- A.9 Homogenization coefficient (alpha)
- A.10 Structural coefficient (phip)
- A.11 Total pore mercury saturation (Sb)
- A.12 Total throat mercury saturation (St)
- A.13 Final mercury saturation (Sf)
- Appendix B (informative) Report format of rock capillary pressure curve measurement results by constant pressure mercury intrusion method
- Appendix C (informative) Report format of rock capillary pressure curve measurement results by constant velocity mercury intrusion method
- Appendix D (informative) Centrifuge method rock capillary pressure curve measurement result report format
- Appendix E (informative) Report format for rock capillary pressure curve measurement results using the partition method
Foreword
This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1: Structure and Drafting Rules of Standardization Documents" Drafting.
This document replaces GB/T 29171-2012 "Determination of Rock Capillary Pressure Curve". Compared with GB/T 29171-2012, except for the structure In addition to adjustments and editorial changes, the main technical changes are as follows.
a) Added the method of measuring capillary pressure curve by constant speed mercury porosimetry (see Chapter 4);
b) Added a method for calculating the water saturation at the core inlet using the centrifuge method (see 5.4.2);
c) Added analysis of the characteristics and limitations of capillary pressure measurement methods using mercury intrusion method, centrifuge method, and semi-permeable partition method (see 4.5, 5.5, 6.5);
d) Added data rounding of rock structure parameters (see Chapter 7).
1 Scope
This document describes the principle of rock capillary pressure curve measurement, and stipulates the test steps and technical requirements for three types of rock capillary pressure curves.
The test data processing methods and technical indicators of measuring instruments provide the characteristics and limitations of various capillary pressure curve measurement methods.
This document is applicable to the constant-pressure mercury intrusion method of cemented cores, the constant-rate mercury intrusion method with core air permeability not less than 0.1mD, and the semi-permeable isolation method.
For the determination of capillary pressure curve by the plate method and the centrifuge method with the air permeability of the core not less than 5 mD, other cores shall be implemented as a reference.
2 Normative reference documents
The contents of the following documents constitute essential provisions of this document through normative references in the text. Among them, the dated quotations For undated referenced documents, only the version corresponding to that date applies to this document; for undated referenced documents, the latest version (including all amendments) applies to this document.
GB/T 18216.4 Testing of electrical safety protection measures for low-voltage power distribution systems with AC 1000V and DC 1500V and below, Measuring or monitoring equipment Part 4: Earth resistance and equipotential earth resistance
GB/T 29172 Core analysis method
SY/T 6014 Petroleum Geology Laboratory Safety Regulations
3 Terms and definitions
There are no terms or definitions to be defined in this document.
4 Mercury porosimetry
4.1 Principle
Mercury is a non-wetting phase for most rocks. If the pressure exerted on mercury is greater than or equal to the capillary pressure of the pore throat, mercury will Subdue capillary resistance to enter the pore. According to the pore volume percentage of mercury entering and the corresponding capillary pressure, the capillary pressure and the mercury content of the sample can be obtained.
The relationship curve of saturation is called the capillary pressure curve of mercury porosimetry.
Since the surface tension and wetting contact angle of mercury are relatively stable, the capillary pressure curve measured by a mercury porosimeter is commonly used to convert the pore throat size and distribution.
Assuming that the rock pore system is composed of cylindrical capillary bundles with different thicknesses, the relationship between capillary pressure and pore throat radius is as formula (1). In the formula. Pc---the value of capillary pressure (absolute pressure), in megapascals (MPa);
sigma ---The value of the surface tension of mercury, in Newtons per meter (N/m);
theta ---The value of the wetting contact angle of mercury, in degrees (°); rc---The value of pore radius, unit is micron (µm).
Under normal laboratory temperature conditions, sigma=0.48N/m, theta=140°, then there is formula (2).
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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 26 pages — is available in the English PDF.
Referenced standards
Normative references
- GB/T 18216.4Electrical safety in low voltage distribution systems up to 1 000 V a. c and 1 500 V d. c - Equipment for testing, measuring or monitoring of protective measures - Part 4: Resistance of earth connection and equipotential bonding
- GB/T 29172Practices for core analysis
SY/T 6014
Similar standards
Editions of GB/T 29171
| Edition | Title | Revision | Status |
|---|---|---|---|
| GB/T 29171-2023 | Rock capillary pressure measurement | current edition | Current |
| GB/T 29171-2012 | Rock capillary pressure measurement | previous edition | Superseded |
This page sells the current edition, GB/T 29171-2023. Earlier editions are listed for reference only.
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Related Standards
GB/T 18216.4-2021 — Electrical safety in low voltage distribution systems up to 1 000 V a. c and 1 500 V d. c - Equipment for testing, measuring or monitoring of protective measures - Part 4: Resistance of earth connection and equipotential bonding
GB/T 29172-2012 — Practices for core analysis
GB/T 7251.4-2026 — Low-voltage switchgear and controlgear assemblies - Part 4: Particular requirements for assemblies for construction sites (ACS)
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