A device and method for simulating complex fracture sanding in shale

Abstract

The invention relates to a testing device and method for simulating pavement of propping agents in a complex manual crack. The testing device is composed of a fracturing fluid preparing tank, a fluid injection pump, a simulation shaft, a plurality of adjustment valves, a flow meter, a pressure meter and the complex manual crack. The manual crack is composed of a primary crack body and a plurality of secondary crack bodies on the periphery of the primary crack body. Different crack states can be simulated. The manual crack is made of transparent organic glass, and the width and the complex degree can be manually arranged. By means of the testing device and method, the flow conditions of sand carrying fluid in the complex manual crack and the pavement conditions of the popping agents under the conditions of different crack widths, different sand carrying fluid sand proportions, different fracturing fluid leak-off rates, different crack complex degrees and the like can be simulated, and the visualization of migration and sedimentation of the propping agents in the complex manual crack can be achieved in the test process.

Description

technical field [0001] The invention relates to a device for simulating the migration, flow and laying of proppant in complex fractures, which can simulate the width of the fracture, the ratio of sand-carrying liquid to sand, the filtration loss of fracturing fluid, and the complexity of the fracture. Sanding status of fractures and secondary fractures. Background technique [0002] my country has abundant shale gas reserves and great development potential, but complex geological conditions and deep burial make it difficult to exploit. Long-section horizontal wells and horizontal well hydraulic fracturing technology are one of the key technologies for efficient and low-cost development of shale gas. Natural fractures are developed in shale reservoirs. During the fracturing process, due to the joint action of shear slip and tension failure, the fracturing fractures often form a main fracture, and many complex secondary fractures are formed around the main fracture. The width...

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Problems solved by technology

[0004] At present, when simulating the migration and placement of proppants in fractures in oil field field fracturing design, experience or theoretical calculations are often used. Foreign experimental devices for studying this rule include concentric cylinder devices and flat plate devices, but the experimental devices are not The indoor simulation parameters are not determined according to the principle of similarity, and the size is small, so it can only conduct a simple study on the settlement of the proppant, and cannot study the accumulation and laying rules of the sand embankment. In addition, the model does not take into account the roughness of the fracture wall and the fracture surface. Fluid loss in fractures and wellbore perforation hole diameter, phase and density, so there is a big discrepancy with the actual situation

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