Rock core measuring system and method

Abstract

The invention provides a rock core measuring system and method. The system comprises a core holder, an injection pump, a suction pump, a pressure difference sensor and a resistivity measuring unit, wherein the injection pump is connected with a fluid injection port of the core holder and used for displacing a non-wetting phase entering into a to-be-measured rock core fixed in the core holder at a constant speed; the suction pump is connected with a fluid output port of the core holder and used for collecting the original fluid which is in the to-be-measured rock core and is displaced out from the to-be-measured rock core; two ends of the pressure difference transducer are connected with the fluid injection port and the fluid output port respectively, and the pressure difference transducer is used for measuring the pressure difference of fluid at the two ends of the to-be-measured rock core in the displacement process of the to-be-measured rock core; the resistivity measuring unit is connected with the to-be-measured rock core and used for measuring the resistivity of the to-be-measured rock core in the displacement process of the to-be-measured rock core. The system and the method provided by the invention solve the technical problems that when a constant-pressure difference method is adopted for measuring a rock core, the resistivity of the rock core and the information of a pore connected with a throat can not be determined at the same time, and the number of obtained data points is small; meanwhile, the measurement period is shortened compared with that of the constant-pressure difference method.

Description

technical field [0001] The invention relates to the field of petroleum exploration and production, in particular to a rock core measurement system and method. Background technique [0002] At present, in order to measure the resistivity, capillary pressure and other characteristics of rock, the method generally adopted is the constant pressure difference method. The basic principle of the constant pressure difference method is: put the rock core to be tested into the core holder, and press the Apply a constant pressure difference from low to high (discontinuous), and use the non-wetting phase to displace the brine in the core. According to the capillary pressure theory, the core is subjected to the interfacial tension, contact angle and pore throat of two immiscible fluids. Influenced by radius, under a certain pressure difference, the distribution of non-wetting phase and water in the core will reach equilibrium, and the water saturation in the core will also reach a certai...

AI Technical Summary

Problems solved by technology

[0009] The present invention provides a rock core measurement system and method to at least solve the inability to simultaneously determine the core resistivity and the information of the pores connected to the throat and the obtained data points caused by the use of the constant pressure difference method to measure the rock core in the related art The technical problem of less and long measurement cycle

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