Method for measuring thick oil-water relative permeability curve

Abstract

The invention discloses a method for measuring a thick oil-water relative permeability curve. The method comprises the following steps of S1, preparing a long rock core, S2, pretreating the long rock core to obtain a nuclear magnetic resonance T2 spectrum after the rock core is saturated with formation water and crude oil, S3, calibrating the formation water and the crude oil through nuclear magnetic resonance testing, and acquiring the conversion relation between the signal amplitude and the volume of the formation water and the crude oil, S4, performing a nuclear magnetic on-line displacement experiment on the long rock core to obtain a nuclear magnetic resonance T2 spectrum of the fluid at the outlet end, S5, according to the signal amplitude of the nuclear magnetic resonance T2 spectrum, calculating the pore volume and irreducible water saturation of the long rock core and the volume of formation water and crude oil at the outlet end, and S6, calculating oil and water relative permeability and corresponding water saturation according to the experimental data obtained in the steps S1 to S5, and drawing an oil-water relative permeability curve. The nuclear magnetic resonance technology and the displacement experiment technology are effectively combined, the experiment result more conforming to the actual situation can be measured, and the operation is simpler.

Description

Technical field [0001] The present invention relates to the field of heavy oil development, and more particularly to a measurement method of a heavy oil-water relative permeability curve. Background technique [0002] In recent years, with the gradual reduction of conventional oil and gas reserves, heavy oil has become an important area of ​​domestic oil and gas exploration and development. Among them, heavy oil-driven development potential and development is large, and has gradually become the focus of the geological and development experts of oil and gas fields at home and abroad. The heavy oil is highly viscosity, the water-drive process is prone to emulsification, and the pressure of the water drive is high, so that the water drilling oil process is more complicated. The relative penetration rate is an important basic measurement parameter in the development experiment. The existing test method mainly uses conventional physical simulation methods to measure oil-water relative...

AI Technical Summary

Problems solved by technology

Due to the high viscosity of heavy oil, the water flooding process is prone to emulsification, and the water flooding injection pressure is relatively high, which makes the water flooding process more complicated.

Relative permeability is an important basic measurement parameter in development experiments. The existing test methods mainly use conventional physical simulation methods to measure the oil-water relative permeability in the process of water flooding, and the oil and water volumes are manually read or weighed. method, the measurement accuracy is poor, and there is a large error

Images