Method for testing filtration loss of rough natural fracture fracturing fluid

Abstract

The invention discloses a method for testing filtration loss of rough natural fracture fracturing fluid. The method comprises the following steps: manually drilling an outcrop of a construction site of a target oil field to obtain a cylindrical rock core; treating the cylindrical rock core, and then conducting artificial fracture forming on the cylindrical rock core in an artificial fracture cutting mode; scanning cracks of the cylindrical rock core to obtain a crack profile map of the cylindrical rock core; calculating the surface roughness of each crack surface; conducting a displacement experiment on the cylindrical rock core subjected to fracture forming; according to the filtration loss time and the accumulated filtration loss of the filtration loss, making a filtration loss and time square root relational graph; according to the filtration loss and time square root relational graph, obtaining a linear relational expression of the filtration loss and time square root and the slope and intercept of a straight line; and according to the cross sectional area of the rock core, the slope of the straight line and the intercept, obtaining the filtration coefficient, the filtration velocity and the initial filtration amount through calculation. According to the method, the filtration law of the fracturing fluid in the natural crack can be accurately obtained, and a basis is provided for hydraulic fracturing during subsequent site construction.

Description

technical field [0001] The invention relates to the technical field of shale oil and gas exploration and development, in particular to a method for testing rough natural fracture fracturing fluid loss. Background technique [0002] The success of the shale gas revolution in the United States in recent years has led the world to gradually pay attention to the development of unconventional oil and gas, and major resource countries in the world have increased their efforts in shale oil and gas exploration and development. In China, the Sichuan Basin is rich in shale gas resources. The annual shale gas production of the Southwest Oil and Gas Field has exceeded 10 billion cubic meters, and future development is expected. [0003] In the development process of unconventional oil and gas exploration and development technology, reservoir stimulation technology such as hydraulic fracturing has become the key technology for economic development in oil and gas field exploration and dev...

AI Technical Summary

Problems solved by technology

However, the existing theory of fracturing fluid loss in fractured reservoirs is not systematic enough to study the law of fracturing fluid loss in natural fractures.

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