Experimental device used for simulating blockage of sand blocking medium of unconsolidated sandstone reservoir

Abstract

The invention provides an experimental device used for simulating the blockage of a sand blocking medium of an unconsolidated sandstone reservoir. The experimental device comprises a mechanical sievetube model, the mechanical sieve tube model is provided with a transparent tube, a first sand blocking screen and a second sand blocking screen, the first sand blocking screen and the second sand blocking screen are installed in the transparent tube, the transparent tube is divided into a gravel cavity at the middle part, a discharge cavity facing the side of the first sand blocking screen, and afeed cavity facing the side of the second sand blocking screen, and the gravel cavity is used for being filled with a gravel to form a gravel layer. By adopting the experimental device, the process ofthe blockage of the sand blocking medium by formation sand flow is accurately simulated within a larger range, thereby being favorable for analyzing and studying the blockage mechanism of the sand blocking medium.

Description

technical field [0001] The invention belongs to the technical field of unconsolidated sandstone oil reservoir exploitation, and in particular relates to an experimental device for simulating the clogging of sand retaining media in unconsolidated sandstone oil reservoirs. Background technique [0002] Unconsolidated sandstone reservoirs are an important part of oil and gas reservoirs in my country, and their geological reserves of crude oil account for more than a quarter of the country's total. During the exploitation of unconsolidated sandstone reservoirs, the formation fluid carries fine sand, mechanical impurities, clay mud and other solid media to impact the sand retaining medium (sand retaining layer and gravel layer in the mechanical screen) and enter the gravel layer. The irregularity and heterogeneity of the voids in the layer make it difficult to discharge the solid medium, resulting in the decrease of the permeability of the gravel layer and the formation of blocka...

AI Technical Summary

Problems solved by technology

However, the operating conditions of the simulation experiment are limited by the currently used experimental equipment, such as the thickness of the gravel layer of the mechanical screen model cannot be adjusted, so it is impossible to accurately simulate and restore the clogging process of the sand retaining medium in the actual sand control well operation. Accurately explain the clogging mechanism of sand retaining media

Images