Test device and test method for measuring change of rock core permeability along with pressure

Abstract

The invention discloses a test device and a test method for measuring change of rock core permeability along with pressure. The device comprises a hydraulic cylinder, a servo motor, a PLC and a watertank, the water tank is communicated with the hydraulic cylinder through a water inlet pipe, and a water inlet valve is arranged on the water inlet pipe; the upper end of the hydraulic cylinder is communicated with the rock core through a water outlet pipe which is provided with a pressure sensor, a pressure gauge and a water outlet valve; the lower end of the hydraulic cylinder is communicated with the hydraulic cylinder through an emptying pipe, and an air valve is arranged on the emptying pipe; the water inlet valve, the pressure sensor, the water outlet valve and the air valve are all connected with the PLC; the PLC is connected with the servo motor, and the servo motor is connected with a piston rod of the hydraulic cylinder through a reduction gear pair and used for driving the piston to move up and down. Test pressure values can be set at will, and characteristics of different rock core samples can be automatically identified. An optimized control strategy is adopted to realizerapid boosting, pressure maintaining, pressure value tracking, small overshoot or no overshoot.

Description

technical field [0001] The invention relates to the technical field of rock core permeability tests, in particular to a test device and a test method for measuring changes in rock core permeability with pressure. Background technique [0002] Core permeability has a great influence on oil production, production methods, and oil production measures in oilfields. Accurate measurement of core permeability and the change of core permeability with pressure will help to adopt corresponding production measures to increase oil production, so the research is of great significance. [0003] At present, the core permeability tester can only test the permeability of the core under one confining pressure. The constant pressure method used by the petroleum industry to test the permeability of the core is the Darcy principle. This type of testing instrument generally has a single function, and can only test the permeability of the core under a fixed pressure, and can only complete the meas...

AI Technical Summary

Problems solved by technology

This type of testing instrument generally has a single function, and can only test the permeability of the core under a fixed pressure, and can only complete the measurement of the permeability of one medium, and cannot perform adaptive testing according to the medium characteristics of the test object

At

Images