A simulation experiment method and experimental device for fracturing proppant transportation with real-time variable sand ratio

Abstract

The invention discloses a fracturing proppant transportation simulation experiment method for real-time variable sand ratio, comprising the following steps: (1) measuring the bulk density ρ of the proppant t and apparent density ρ s ; (2) Set the value C of the initial sand ratio 1 ; (3) Set the fracturing fluid volume flow rate V f (4) Calculate the mass flow rate W of the required proppant by the volume flow rate of the fracturing fluid and the given sand ratio p , according to W p Calculate the servo motor speed n; (5) According to the determined fracturing fluid volume flow V f Pump proppant and fracturing fluid into the sand mixing cylinder at the same time as the speed n of the servo motor. When the liquid in the sand mixing cylinder reaches the high water level limit, stop pumping the fracturing fluid and proppant, open the sand mixing fluid outlet of the sand mixing cylinder, The sand mixing fluid is injected into the simulated fracture; when the liquid in the sand mixing cylinder reaches the limit of the low water level, the fracturing fluid and proppant are pumped into the sand mixing cylinder; (6) Change the value of the sand ratio and repeat steps (3) to (5 ), to achieve the purpose of changing the sand ratio in real time in the fracturing proppant delivery simulation experiment.

Description

technical field [0001] The invention relates to the technical field of fracturing reconstruction of oil and gas wells and coal bed gas wells. In particular, a fracturing proppant transportation simulation experiment method and experimental device for real-time variable sand ratio. Background technique [0002] Hydraulic fracturing is an important measure for oil and gas wells and coalbed methane wells to be put into production and increase production. Its basic principle is to use ground high-pressure pumps to pump fracturing fluid into the well to create fractures in the formation. When fractures are generated in the formation, fracturing fluid containing proppant (also known as sand mixing fluid) is pumped in to prevent the fractures from reclosing after fracturing. The process of fracturing fluid carrying proppant into formation fractures is called proppant delivery process. The delivery of proppant affects the distribution state of proppant in fractures, which is the k...

AI Technical Summary

Problems solved by technology

[0004] One purpose of the present invention is to provide a fracturing proppant transport simulation experiment method for real-time variable sand ratio in view of the deficiency that traditional proppant delivery devices cannot realize real-time change of sand ratio

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