Method for determining relative permeability of artificial fracture oil-water based on two-dimensional nuclear magnetic resonance

Abstract

The present application relates to a method for determining artificial fracture oil-water relative permeability based on two-dimensional nuclear magnetic resonance, which comprises: oil-water nuclear magnetic signal calibration under reservoir temperature and pressure conditions; two-dimensional nuclear magnetic substrate signal test of shale matrix; artificial fracture filling with fracturing fluid, calculation of single-sided wall surface area of the fracture, estimation of fracture volume; making the conditions of the core and artificial fracture be the initial state of the reservoir after fracturing; nuclear magnetic resonance test of the initial state of the reservoir after fracturing; initial fracture width CT scan test; calculation of absolute permeability of the fracture; fracture fluid saturation test during flowback production process, calculation of water saturation and oil saturation in the fracture at t i ; fracture width test during flowback production process, calculation of fracture width at t 10 ; calculation of artificial fracture oil-water relative permeability; and drawing of a shale oil reservoir artificial fracture relative permeability curve. The present application can non-destructively, in-situ and in real time reveal the dynamic percolation behavior of artificial fractures in multiphase flow process.

Images