GB/T 28912-2025 Active National standards

GB/T 28912-2025 Test method for two phase relative permeability in rock

Publish Date: 2025-10-05 Implement Date: 2026-05-01 For services related to genuine standard inquiry, procurement, translation, and other related services in China, please Contact Us

Basic Information

Standard Code: GB/T 28912-2025

Standard Type: National standards

Standard Status: Active

is_force_gb: no

CCS Name: Oil development

ICS Name: The extraction and processing of oil and natural gas

Publish Date: 2025-10-05

Implement Date: 2026-05-01

Pages: 32 pages

Scope

This document describes the basic principles of using steady-state and non-steady-state methods to determine the relative permeability of two-phase fluids in rocks, and specifies the measurement steps and technical requirements, calculation methods, and technical specifications of measuring instruments. This document is applicable to the determination of the relative permeability of two-phase fluids in sandstone samples. Other types of porous media can be referenced for implementation. The steady-state method is suitable for determining the oil-water relative permeability of samples with an air permeability greater than 50 mD, and the water-air relative permeability of samples with an air permeability greater than 0.5 mD. The non-steady-state method is suitable for determining the oil-water relative permeability of samples with an air permeability greater than 5 mD, and the gas-liquid relative permeability of samples with an air permeability greater than 1 mD. For other samples outside the above permeability ranges, the document can be referenced for implementation.