Unstable-state titration device and method for testing medium-high permeable core liquid permeability

Abstract

The invention provides an unstable-state titration device and method for testing medium-high permeable core liquid permeability. The device comprises a standard container, a core clamp, an ISCO pump,a pressure sensor and a liquid receiving pipe, the standard container is connected with an upstream-end inlet of the core clamp by an inlet valve through a pipeline, and an outlet of the core clamp isconnected with the liquid receiving pipe by an outlet valve through a pipeline; the upstream end of the core clamp is connected with an emptying valve, and the ISCO pump is connected with annulus ofthe core clamp by the pressure sensor through a pipeline. The unstable-state titration device and method are low in requirements on experimental hardware, simple in operation and accurate and reliablein experimental result, the objective of quickly, effectively, conveniently, quickly and accurately testing medium-high permeable core liquid permeability is achieved, and acquired testing results can provide basic data for medium-high permeable reservoir evaluation and capacity research.

Description

technical field [0001] The invention relates to an unsteady-state titration device and method for testing medium and high-permeability rock core fluids to measure permeability, and belongs to the technical field of oil-gas field development core experiment analysis. Background technique [0002] Medium- and high-permeability cores have strong seepage capacity. When measuring their hydraulic permeability, the seepage velocity is low and the displacement pressure is small. The pressure may be within or equal to the error range of the pressure sensor system, and the reliability of the test results is poor; When the seepage velocity is too fast, according to the sensitivity experiment standard, the velocity-sensitive effect may occur, thereby affecting the test results. At present, although the "steady-state titration method" for testing the permeability of medium and high-permeability cores has been formed, this method requires a constant liquid level, and the flow rate at the ...

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Problems solved by technology

[0002] Medium- and high-permeability cores have strong seepage capacity. When measuring their hydraulic permeability, the seepage velocity is low and the displacement pressure is small. The pressure may be within or equal to the error range of the pressure sensor system, and the reliability of the test results is poor; When the seepage velocity is too fast, according to the sensitivity test standard, the velocity-sensitive effect may occur, thereby affecting the test results

At present, although the "steady-state titration method" for testing the permeability of medium and high-permeability cores has been formed, this method requires a constant liquid level, and the flow rate at the inlet of the container is consistent with the flow rate at the core outlet. The experimental operation is difficult and time-consuming.

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