Device and method for measuring fluid loss coefficient of supercritical carbon dioxide fracturing fluid

Abstract

The invention belongs to the technical field of production increase of unconventional oil and gas and particularly relates to a device and a method for measuring a leakoff coefficient of a supercritical carbon dioxide fracturing fluid. The device and the method are used for determining the leakoff coefficient of the supercritical carbon dioxide fracturing fluid. The device for measuring the leakoff coefficient of the supercritical carbon dioxide fracturing fluid comprises a gas injection system, a pressure control system, an experimental model system and a measuring system, wherein the gas injection system injects methane or carbon dioxide into the experimental model system, the pressure control system provides pressure for the experimental model system and the gas injection system, the experimental model system provides a high-temperature and high-pressure stratum environment for experiments, and the measuring system measures the volumes of different gases flowing out in the experimental process. The temperature and the pressure of the device provided by the invention can be adjusted to satisfy the high-temperature and high-pressure environmental requirements on carbon dioxide in a supercritical state, so that the leakoff rule of the supercritical carbon dioxide fracturing fluid under different temperature and pressure conditions can be truly researched.

Description

technical field [0001] The invention belongs to the technical field of unconventional oil and gas stimulation, and in particular relates to a device and method for measuring the fluid loss coefficient of supercritical carbon dioxide fracturing fluid, which is used to study the fluid loss of supercritical carbon dioxide fracturing fluid in unconventional oil and gas fracturing stimulation engineering To determine the fluid loss coefficient of supercritical carbon dioxide fracturing fluid. Background technique [0002] Supercritical carbon dioxide (SC-CO 2 ) fracturing is a new type of unconventional oil and gas reservoir stimulation technology. It has a series of advantages that cannot be compared with conventional hydraulic fracturing technology. means. [0003] Supercritical carbon dioxide fracturing fluid has many characteristics such as less formation damage, viscosity reduction, anti-swelling, resistance reduction, and drainage aid. When the injection volume is constan...

AI Technical Summary

Problems solved by technology

Excessive fracturing fluid fluid loss will also lead to gradual accumulation of proppant, increasing the proppant content in fractures, prone to sand plugging, and wellbore collapse

After fracturing, under a certain fluid loss rate, the formed fractures can be closed in time, but when the fluid loss rate is too slow, the proppant will quickly deposit in the fracture, which will affect the uniform distribution of proppant in the fracture, and cannot Supporting the entire height of the fracture, the width of the fracture becomes narrower, and the stimulation effect is not ideal

Therefore, the key parameter for optimal design of fracturing hydraulic parameters using supercritical carbon dioxide fracturing is to determine the fluid loss coefficient of supercritical carbon dioxide fracturing fluid; at present, there are no reports on the fluid loss performance of supercritical carbon dioxide fracturing fluid in China

Images