A low-frequency petrophysical modulus measurement system for reservoir rocks

Abstract

The invention provides a reservoir rock low-frequency rock physical modulus measurement system. The reservoir rock low-frequency rock physical modulus measurement system comprises 1, a hyperbaric cabin subsystem comprising an upper cover, a lower cover, a cylindrical aluminum resonator and a test sample connected to upper and lower pipes, 2, a confining pressure control subsystem comprising a deionized water container, a confining pressure pump and a gas removal device, 3, a pore pressure injection subsystem comprising a constant-speed constant-pressure pump, a high-pressure flexible pipe, a high-pressure stainless steel polished hard pipe, a small core holder and a pressure return device, 4, a mobile core measurement subsystem comprising a position controller, a stepper motor, a screw, a guide rail and a slider, 5, a temperature control subsystem comprising an electrical heating system, a thermal insulation system and a temperature controller, and 6, a signal output and receiving subsystem comprising a lock-in amplifier, a power amplifier and a preamplifier. The reservoir rock low-frequency rock physical modulus measurement system can realize measurement of a reservoir rock sample under reservoir conditions of changing confining pressure, changing temperature and changing pore pressure.

Description

technical field [0001] The invention relates to the field of oil and gas exploration equipment, in particular to a low-frequency rock physical modulus measurement system for reservoir rocks. Background technique [0002] The laboratory measurement of petrophysical properties is a basic research work in geophysical applied research. Due to the complexity of underground rocks, it is generally believed that the petrophysical properties of rocks change with the frequency. Accurately measuring the petrophysical properties in the field application frequency range in the laboratory is very important for using seismic exploration and acoustic logging data to understand underground rocks. It is of great significance to study the change characteristics of seismic phase and logging phase with frequency. [0003] There are several important methods in the experimental measurement of rock physics at home and abroad. The first type is the ultrasonic transmission method; this method is w...

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Problems solved by technology

[0005] Using differential resonance acoustic spectrum measurement technology to obtain the elastic properties of materials at frequencies below kHz, the measurement technology and elastic modulus estimation technology involved have some important limitations and shortcomings, as follows: 1) The device can only be used in The measurement was carried out under normal temperature and pressure, which failed to provide reservoir conditions for the rock samples to be tested, that is, high temperature and high pressure conditions; 2) During the measurement, multiple points were measured in the cavity, but only the measurement information of the center point of the cavity was used for modulus estimation ; 3) The algorithm approximates too much, so that the elastic modulus (or acoustic properties) of relatively soft materials is estimated relatively accurately; 4) The repeatability of the sample elastic property measurement is poor

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