A test device and method for simulating proppant backflow after fracture closure

Abstract

The present invention relates to a test device and method for simulating proppant backflow after fracture closure, which includes a first advection pump, an infusion pipeline, a temperature-controllable intermediate container, a pressure supply system, a visual sand collector, a balance and a data acquisition system; One end of the first advection pump is connected to the container containing the experimental liquid, and the other end is connected to the temperature-controllable intermediate container and the first end of the pressure supply system through the infusion pipeline in turn, and the second end of the pressure supply system is connected to the first end of the pressure supply system through the infusion pipeline. The infusion pipeline is respectively connected with the visual sand collector and the balance; and the second end of the pressure supply system is also electrically connected with the data acquisition system; the pressure supply system is set to two, and the two pressure supply systems System parallel setup. The present invention makes the experimental efficiency higher and closer to the actual situation of the stratum by superimposing the diversion chamber, vacuuming, circulating flushing and other designs.

Description

technical field [0001] The invention relates to the technical field of hydraulic fracturing reservoir reconstruction, in particular to a test device and method for simulating the backflow of proppant after fracture closure. Background technique [0002] Hydraulic fracturing is the key technology for reservoir stimulation at present, and the important link is fracturing fluid flowback. The purpose of reasonable flowback is to minimize proppant backflow and maintain high fracture conductivity. However, because there is no clear understanding of fracture closure and proppant migration, a large amount of proppant flows back during the flowback process after fracturing, which affects the fracturing effect and punctures the production equipment. [0003] At present, although there are device simulations for proppant reflux in relevant literature, they are limited by equipment reasons: conventional equipment is generally a single diversion chamber, that is, only one set of experime...

AI Technical Summary

Problems solved by technology

However, due to the lack of a clear understanding of fracture closure and proppant migration, a large amount of proppant flows back during the flowback process after fracturing, which affects the fracturing effect and punctures the production equipment.

[0003] At present, although there are device simulations for proppant reflux in relevant literature, they are limited by equipment reasons: conventional equipment is generally a single diversion chamber, that is, only one set of experiments can be performed each time, and the experiment efficiency is low; in order to better simulate the formation In the actual situation, the diversion chamber needs to be vacuumed before the experiment. Conventional equipment generally has a built-in filter in the diversion tank, which cannot be taken out after vacuuming; it is difficult to collect sand at the outlet of the diversion chamber in conventional equipment, and effective measurement cannot be performed.

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