Device and method for dynamically testing sand carrying capacity of large fracturing fluid

Abstract

The invention relates to a device and method for dynamically testing the sand carrying capacity of a large fracturing fluid, and belongs to the technical research field of oil and gas field development fracturing. The device comprises a mixing tank, a screw pump, a rectangular model and a slag liquid collecting tank, wherein the outflow end of the mixing tank is communicated with the input end ofthe rectangular model with an adjustable slit width and inclinable through the screw pump, the outflow end of the rectangular model is divided into two branches after passing through an inlet and outlet diffuser, one is communicated with the slag liquid collecting tank through a pipeline and a ball valve VDd, and the other is communicated with the mixing tank through the pipeline and a VDe. The device has the advantages of simple and rapid operation, convenient control, safety, reliability and reasonable structure; according to the using method of the device, the sand carrying capacity of thefracturing fluid can be comprehensively evaluated, proper fracturing fluid and proppant for oil-gas fracturing can be preferentially screened, and the prediction results of typical fracture width canbe tested and verified according to the hydraulic fracturing model; the test method is closer to the actual situation of the application environment, and the performance evaluation of the fracturing fluid and the proppant is more scientific.

Description

technical field [0001] The invention relates to a large-scale fracturing fluid sand-carrying capacity dynamic testing device and method, belonging to the research field of fracturing technology for oil and gas field development. Background technique [0002] Fracturing fluid is an important part of fracturing technology, which plays the role of transmitting pressure and carrying proppant. It is of great significance to study the settlement law of proppant in fracturing fluid. For the settlement of particles, due to the complexity of the phenomenon, strict theoretical analysis is very difficult, and most of them are carried out by experimental methods. At the same time, the sand-carrying ability of fracturing fluid under different flow rates, different sand injection concentrations and different fluid viscosities during fracturing construction will directly affect the distribution of sand particles and the conductivity of sand-filled fractures. [0003] The cracks in the exi...

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Problems solved by technology

[0003] The cracks in the existing crack simulation device are fixed, which cannot realize the stepless adjustment of the fracture width, and the model size is small. The cracks in the simulation device are only equipped with single-sided transparent glass, which can only be observed from one side, and the simulation device cannot be tilted, so fracturing cannot be simulated. The sand-carrying ability of liquid in different fracture structures can be seen from the test limitations of existing fracture simulation devices

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