Fracturing fluid rheological proppant transport simulation method and stepless adjustable fracture width test device

Abstract

The invention provides a fracturing fluid rheological proppant transport simulation method and a stepless adjustable fracture width test device. The device comprises a transparent observation window, a back panel, a screw rod and a wedge-shaped sliding block, wherein input holes are longitudinally formed in the input side of the back panel and output holes are longitudinally formed in the output side of the back panel; and an observation cavity is communicated with a material supply device through a first multi-pass pipe arranged on the input side and a second multi-pass pipe arranged on the output side. According to the method and the device, the simulation of a large-section crack is realized through the movable sliding block, the change of the crack can be subjected to stepless regulation, the liquid-solid flow state change in the crack in a fracturing environment can be effectively simulated, and more direct reference data is provided for fracturing fluid formula optimization and proppant selection, so that a fracturing fluid and a proppant can be optimized; and for the flow change of coal bed gas and shale gas fracturing fluids in the crack and the sanding effect monitoring, measurement data can reflect a fracture forming effect of the fracturing fluid and a coal bed gas and shale gas fracturing process is optimized.

Description

technical field [0001] The invention relates to a fracturing fluid rheological proppant migration simulation method and a stepless adjustable fracture width testing device, belonging to the field of simulation experiments. Background technique [0002] Coalbed methane and shale gas, as unconventional natural gas, account for an increasing proportion in the national energy system. As an effective construction technology, water-based fracturing plays a decisive role in the mining of coalbed methane and shale gas, and is the most mature and effective mining method today. Fracturing fluid, as the medium for formation fracturing, plays the role of fracture creation, penetration and sand carrying. Fractures serve as gas production channels, and their width and proppant filling determine the gas production rate of a single well. In actual construction, poor sand-carrying effect of fracturing fluid often leads to insufficient filling in fractures, resulting in closure of fractures ...

AI Technical Summary

Problems solved by technology

The fixed fracture device cannot simulate the impact of the dynamic change process of the fracture on the fracturing fluid and proppant, and cannot realize the expansion and closure of the fracture. It is not targeted for the simulation of different formations and different fracturing degrees.

Images