Device and method for measuring biot coefficient of poroelastic medium under high temperature and high pressure

Abstract

The invention relates to a device and a method for measuring the Biot coefficient of a poroelastic medium under high temperature and high pressure. The experimental device comprises an autoclave, a pore pressure pump system, a confining pressure pump system, a computer control system, a heating system, a temperature control box and the like, wherein the computer control system is connected with the pore pressure pump system, the confining pressure pump system and the autoclave respectively; a first vent valve and a second vent valve are mounted on the autoclave; the other end of the confining pressure pump system is connected with the autoclave; the other end of the pore pressure pump system is connected with the autoclave; the heating system covers the outer side of the autoclave; the temperature control box is connected with inside and outside of the autoclave respectively. With the adoption of the device and the method, the problem about test of the Biot coefficient of a rock core under the high temperature condition is solved, the temperature pressure condition of the rock core in the stratum can be more really restored, and more guidance is achieved for field application. Main equipment adopted by the device is obtained through renovation based on original normal-temperature triaxial experimental equipment, so that the cost is greatly saved, and the experimental requirements can be met.

Description

technical field [0001] The present invention relates to the field of rock mechanics, in particular to a device and method for measuring the Biot coefficient of porous elastic media under high temperature and high pressure, which is used to obtain the Biot coefficient for calculating the effective stress of elastic porous media, and to finely analyze the mechanical properties of rocks under high temperature and high pressure conditions , to provide a basis for guiding the drilling and production of oil, gas and mine resources. Background technique [0002] In 1925, Terzahi first proposed the effective stress principle in soil mechanics, and Biot conducted pioneering research on the basis of it, and proposed the Biot coefficient reflecting the effective stress of poroelastic media. The Biot coefficient has become a very important characteristic parameter to describe porous media such as rocks, and is a key parameter required for hydraulic fracturing design, sand production pre...

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Problems solved by technology

[0004] Although this invention patent can complete the stress-seepage coupling test of rock materials, especially low-permeability rocks under complex stress paths, and automatically calculate the permeability, porosity, axial and lateral Biot coefficients of rock samples, there is no Consider the effect of temperature on test results

In fact, when a formation with a high temperature is encountered during on-site drilling construction, when the Biot coefficient obtained at normal temperature is used to calculate the effective stress of the porous medium to predict the formation pressure, there is often a large deviation from the actual situation. When it is large, it is likely to cause complex accidents

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