A dynamic monitoring system and method for simulation of fracture expansion in oil and gas reservoirs

Abstract

The invention discloses a dynamic monitoring system and method for simulating the expansion of fractures in oil and gas reservoirs. The system and method use pistons to hydraulically load rock specimens, and dynamically monitor the extension of fractures by means of the real-time imaging function of the neutron photography system. and extended behavior. The present invention introduces the neutron photography system in the fracturing physical simulation process, overcomes the shortcomings of the traditional acoustic emission technology and fluorescent tracer method that cannot be monitored in real time during the study of fracturing expansion, and solves the problem of dynamic real-time monitoring of fracturing expansion. The real-time cooperation between rock true triaxial and neutron imaging technology is realized, which is of great significance for studying the formation and extension of fractures under true triaxial stress state.

Description

technical field [0001] The invention relates to a dynamic monitoring system and method for simulating fracture expansion in oil and gas reservoirs, belonging to the fields of rock mechanics and oil and gas development. Background technique [0002] With the deepening of oil and gas exploration and development, conventional oil and gas resources are becoming increasingly tense, and the success of the shale gas revolution in the United States has made shale oil and gas, tight oil and gas and other unconventional oil and gas resources show strong vitality under the existing technology. my country is rich in unconventional oil and gas resources, but generally speaking, unconventional oil and gas reservoirs have the characteristics of low porosity and low permeability. Under conventional conditions, oil and gas extraction is difficult, and artificial fracturing and other technical means are needed. Mastering the law of fracture extension in oil and gas reservoirs is the key to co...

AI Technical Summary

Problems solved by technology

[0004] Acoustic emission technology and fluorescent tracer are the common methods for fracturing monitoring at present, but they have limitations: First, the positioning accuracy of acoustic emission technology is largely affected by the location and accuracy of the probe, and the acoustic emission The technology cannot accurately display the fracture surface of the fracture, and it is difficult to accurately present the complex extension and expansion phenomena such as torsion and bifurcation of the fracture surface; both, the effect of the fluorescent tracer can only be realized after the experiment is completed along the fracture. Reflects that the dynamic expansion path of the fracture during the fracturing process cannot be recorded

[0007] Although the above-mentioned patents can be used for real-time monitoring of fracture expansion experiments, they still have limitations. When the rock breaks through its strength limit and forms fractures, the fracture expansion rate may exceed the ability of CT to capture imaging, resulting in some key fracture expansion details. It is impossible to know; in addition, the preparation of special carbon fiber materials also has problems such as high cost and applicability

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