Device capable of evaluating dynamic sand-carrying capacity of foam fracturing fluid and working method of device

Abstract

The invention discloses a device capable of evaluating the dynamic sand-carrying capacity of foam fracturing fluid. The device comprises a gas producing part, a fracturing fluid storage part, a foam generator, connected with the gas producing part and the fracturing fluid storage part, a proppant storage tank and a simulative crack plate, wherein the gas producing part comprises a gas cylinder, a gas flow meter and a one-way valve which are sequentially connected with one another in the gas diffusion direction; the fracturing fluid storage part comprises a device capable of controlling the outflow rate of the fracturing fluid; gas generated by the gas producing part and liquid produced by the fracturing fluid storage part are used for producing fracturing fluid foam under the action of a bubble generator; the fracturing fluid foam flows into the top of the proppant storage tank; the simulative crack plate is arranged at the bottom of the proppant storage tank; a back-pressure valve is arranged at the tail end of the simulative crack plate. The device is capable of evaluating the dynamic sand-carrying capacity of the foam fracturing fluid and normal single-phase fracturing fluid under predetermined pressure; the microscopic visualization of interaction between the foam and a proppant can be achieved. The device has the characteristics of being efficient, accurate and economic.

Description

technical field [0001] The invention relates to a foam fracturing fluid dynamic sand-carrying capacity evaluation device and a working method, belonging to the technical field of fluid performance evaluation devices for oil and natural gas fracturing stimulation. Background technique [0002] At the end of the 1970s, foam fracturing fluid has been developed and applied in the world. Up to now, foam fracturing technology has been widely used in the United States, Canada, Australia and other countries. After the foam fracturing technology was introduced in China in the late 1980s, experimental research and on-site application exploration have been carried out continuously, and various foam fluid systems have been formed, mainly including pure surfactant foam fracturing fluid and linear rubber foam fracturing fluid. , acid-base cross-linked foam fracturing fluid, etc. [0003] Dynamic sand-carrying performance refers to the ability of the fracturing fluid system to carry propp...

AI Technical Summary

Problems solved by technology

First of all, this kind of experimental equipment is bulky, expensive, and difficult to popularize; secondly, this method is still to study the sand-carrying performance of fracturing fluid in pipelines instead of fractures; finally, although the article realizes the visualization of proppant settlement However, due to the large diameter of the pipe, poor light transmission of the foam, and irregular particle migration tracks, the device cannot achieve a good microscopic visualization of the interaction between the foam and the proppant.

Images