GB/T 26981-2020Analysis method for reservoir fluid physical properties (English PDF)

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009.

This standard replaces GB/T 26981-2011 "Analytical Methods of Oil and Gas Reservoir Fluid Properties". Compared with GB/T 26981-2011, the main technical The technical changes are as follows:

---Added the definition of dissolved gas-oil ratio and pseudo-components (see 3.9.3, 3.23);

---Modified the definitions of single degassing, black oil, volatile crude oil, condensate gas, moisture, dry gas, bubble point pressure, dew point pressure (see section Chapter 3, Chapter 3 of the 2011 edition);

---Modified the names and specifications of instruments and meters (see 4.1, 4.1 in the 2011 edition);

--- Deleted the dead oil cutting distillation method to determine the average relative molar mass and density of the C7 fraction (see 9.2.6 in the 2011 edition);

---Added capillary viscosity test method and electromagnetic viscosity test method (see 13.3, 13.4);

---Added the direct test method of the formation fluid density, namely the high temperature and high pressure density meter method (see 13.5.3);

---Added the calculation method of pseudo-component density and molar mass (see 14.2.2.2, 14.2.2.3);

---Move the calculation part of the separation experiment of the depleted effluent of constant volume of condensate gas to the informative appendix (see Appendix F, 2011 edition 15.6);

---Modified the types of volatile crude oil properties analysis items (see Chapter 16, Chapter 16 of the 2011 edition).

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1 Scope

This standard clarifies the basic principles of the physical property analysis of oil and gas reservoir fluids, and specifies the main instruments used, the inspection of oil and gas samples, and formation fluids.

Preparation, sample transfer, analysis and testing, calculation methods and instrument calibration methods.

This standard applies to the determination of the physical properties of oil and gas reservoir fluids.

2 Normative references

The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this document. For undated references, the latest version (including all amendments) applies to this document.

GB/T 13610 Natural gas composition analysis gas chromatography

SH/T 0169 Determination of average molecular weight of mineral insulating oil (freezing point reduction method)

SH/T 0604 crude oil and petroleum products density determination method (U-shaped vibrating tube method)

SY/T 5154 Oil and gas reservoir fluid sampling method

3 Terms and definitions

The following terms and definitions apply to this document.