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GB/T 29171-2023: Rock capillary pressure measurement
Status: Valid GB/T 29171: Evolution and historical versions
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| GB/T 29171-2023 | English | 649 |
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Rock capillary pressure measurement
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GB/T 29171-2023
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| GB/T 29171-2012 | English | 959 |
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Rock capillary pressure measurement
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GB/T 29171-2012
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PDF similar to GB/T 29171-2023
Basic data | Standard ID | GB/T 29171-2023 (GB/T29171-2023) | | Description (Translated English) | Rock capillary pressure measurement | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | E12 | | Classification of International Standard | 75.020 | | Word Count Estimation | 34,362 | | Date of Issue | 2023-09-07 | | Date of Implementation | 2024-01-01 | | Older Standard (superseded by this standard) | GB/T 29171-2012 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 29171-2023: Rock capillary pressure measurement---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
ICS 75.020
CCSE12
National Standards of People's Republic of China
Replace GB/T 29171-2012
Determination of rock capillary pressure curve
Published on 2023-09-07
2024-01-01 Implementation
State Administration for Market Regulation
Released by the National Standardization Administration Committee
Table of contents
Preface III
1 Scope 1
2 Normative reference documents 1
3 Terms and Definitions 1
4 Mercury porosimetry1
4.1 Principle 1
4.2 Measuring instruments 2
4.3 Test step 3
4.4 Test data processing 4
4.5 Characteristics and limitations of mercury porosimetry capillary pressure curve determination method 7
5 Centrifuge method 7
5.1 Principle 7
5.2 Measuring instruments 7
5.3 Test step 8
5.4 Test data processing 10
5.5 Characteristics and limitations of the centrifuge method for measuring capillary pressure curve 11
6 Semi-permeable partition method 11
6.1 Principle 11
6.2 Measuring instruments11
6.3 Test step 12
6.4 Test data processing 14
6.5 Characteristics and limitations of the semi-permeable partition method for measuring capillary pressure curve 14
7 Data rounded to approximately 15
8 Report content and format15
Appendix A (informative) Calculation of rock pore structure characteristic parameters using mercury intrusion method capillary pressure curve 16
A.1 Average throat radius 16
A.2 Average pore radius 16
A.3 Average pore-throat ratio (η) 16
A.4 Average pore throat radius 16
A.5 Contribution rate of a single throat to permeability16
A.6 Sorting coefficient (Sp) 17
A.7 Skewness (Skp) 17
A.8 Kurtosis (Kp) 17
A.9 Homogenization coefficient (α) 17
A.10 Structural coefficient (ϕp) 18
A.11 Total pore mercury saturation (Sb) 18
A.12 Total throat mercury saturation (St) 18
A.13 Final mercury saturation (Sf) 18
Appendix B (informative) Report format of rock capillary pressure curve measurement results by constant pressure mercury intrusion method 19
Appendix C (informative) Report format of rock capillary pressure curve measurement results by constant velocity mercury intrusion method 21
Appendix D (informative) Centrifuge method rock capillary pressure curve measurement result report format 24
Appendix E (informative) Report format for rock capillary pressure curve measurement results using the partition method 26
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).
Please note that some content in this document may be subject to patents. The publisher of this document assumes no responsibility for identifying patents.
This document is proposed and coordinated by the National Petroleum and Natural Gas Standardization Technical Committee (SAC/TC355).
This document was drafted by. PetroChina Exploration and Development Research Institute, Daqing Oilfield Co., Ltd. Exploration and Development
Research Institute, CNOOC Energy Development Co., Ltd. Engineering Technology Company, China Petroleum & Chemical Corporation Shengli Oilfield Branch Exploration
Development Institute.
The main drafters of this document. Zhang Zubo, Lu Weifeng, Chen Xu, Wang Xinjiang, Zhang Ke, Gao Jian, Sun Linghui, Cui Huanqi, Tang Lei, Hong Xin, Sun Zhigang,
Li Fen, Zhang Hongxin.
This document was first published in.2012 and this is the first revision.
Determination of rock capillary pressure curve
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).
Pc=
2σcosθ
rc
(1)
In the formula.
Pc---the value of capillary pressure (absolute pressure), in megapascals (MPa);
σ ---The value of the surface tension of mercury, in Newtons per meter (N/m);
θ ---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, σ=0.48N/m, θ=140°, then there is formula (2).
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