Device and method for measuring minimum starting pressure and pressure wave propagation rate

Abstract

The invention provides a device and a method for measuring a minimum starting pressure and a pressure wave propagation rate. The device comprises: a micro constant-flux pump, an intermediate container, a pressure sensor, a monitoring module, a core holder, a micro transfer pipette and a ring pressure pump, wherein the core holder is used for clamping a non-permeable object for calibration and a core to be tested; the micro transfer pipette is connected with the other end of the core holder through a connecting pipe for observing a liquid discharge starting time of the core to be tested so a tomeasure the pressure wave propagation rate; the ring pressure pump is connected with the core holder through a pressurization pipeline; and the monitoring module is electrically connected with the pressure sensor for respectively monitoring a pressure time-varying relationship of the pressure sensor when the non-permeable object and the core to be tested are clamped in the core holder in real time, so as to measure the minimum starting pressure. By adoption of the device and the method provided by the invention, the minimum starting pressure and the pressure wave propagation rate of liquid inthe core can be accurately measured.

Description

Technical field [0001] The invention relates to the field of petroleum exploration and development, in particular to core parameter measurement technology, in particular to a device and method for measuring minimum starting pressure and pressure wave propagation velocity. Background technique [0002] The proportion of tight and low-permeability oil and gas reservoirs in my country's oil and gas resources is increasing year by year. Oil and gas show nonlinear characteristics when seepage in tight and low-permeability oil and gas reservoirs. A typical feature is the existence of minimum starting pressure. The current method of measuring minimum starting pressure is divided into steady-state method and non-steady-state method. The steady-state method is to measure the flow rate under different stable pressure differences, and then extrapolate to the minimum starting pressure when the flow rate is zero. Pressure: The non-steady state method is a given initial pressure difference bet...

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Problems solved by technology

Both the steady-state method and the unsteady-state method are a dynamic-to-static measurement process, and the minimum starting pressure corresponds to a static-to-dynamic process as the name implies; the two states are not reversible. To sum up, there is currently no one A measuring device and method that can accurately measure the minimum starting pressure, and then there is no device and method that can accurately measure the propagation rate of fluid pressure waves in the core

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