In-situ fluid volume measuring method for use in high-temperature and high-pressure rock core displacement process and device thereof

Abstract

The invention discloses an in-situ fluid volume measuring method for use in a high-temperature and high-pressure rock core displacement process, and a device which can be used for measuring the fluid volume by using the method. The method comprises the following steps of: I, preparing before formal displacement to keep a fluid in the rock core, a fluid in a guide tube and a fluid in a container in a corresponding high-temperature and high-pressure environment; II, starting formal displacement: pumping a displacement liquid through a pressure pump, and converging the fluid (particularly gas and oil) driven out of the rock core through displacement in an enclosed transparent container; and III, measuring the volume of each fluid: after oil, gas and water are delaminated fully, reading the volumes of oil, gas and water through graduation marks on the container according to different colors of the three kinds of fluids. The design fluid volume measuring device is simple in structure, and is realized by only arranging four valves, two guide tubes, two pressure measuring instruments, a collecting container, a buffering container and a semi-permeable clapboard on the basis of the conventional high-temperature and high-pressure rock core displacement experimental device.

Description

technical field [0001] The invention also relates to a fluid volume measuring device, in particular to a fluid volume measuring device during high temperature and high pressure rock core displacement. Background technique [0002] Under high temperature and high pressure, especially the existence of high temperature, the expelled fluid in the process of core displacement has two phases of gas and liquid. At present, the displacement fluid is mostly directly measured by an open small measuring cylinder, so that the capture and measurement of the gas phase cannot be realized; in addition, at high temperature, the liquid is volatile, so the measurement error of the liquid is relatively large, especially in the tight sandstone displacement experiment. Due to the slow displacement speed and the small amount of expelled liquid, the error caused by the volatilization of liquid will be larger. Aiming at the shortcomings of the open small measuring cylinder measurement method, a clo...

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Problems solved by technology

Although this method can capture and measure the gas, it can also avoid the volatilization of the liquid, but there are still many problems in this measurement method. It has a great impact, and also affects the solubility of gas in liquid, thereby changing the gas-liquid volume ratio. Therefore, the volume of each phase fluid measured in this way is still inaccurate, and cannot truly reflect the fluid volume inside the core under high temperature and high pressure.

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