Foam huff and puff sand discharging experiment device and method based on integration of well hole and oil reservoir

Abstract

The invention discloses a foam huff and puff sand discharging experiment device and method based on integration of a well hole and an oil reservoir. The experiment device is formed by a core holding unit provided with an artificial core, a second sand-filled pipe used for simulating the well hole, a first sand-filled pipe used for simulating a well hole buffering space and a fourth sand-filled pipe used for simulating an oil reservoir buffering space in a communicated mode, wherein the inlet end of the second sand-filled pipe is communicated with an outlet cavity of a piston-type stirring container, the outlet cavity is further communicated with a nitrogen gas cylinder, a plurality of valves and a plurality of pressure sensors are arranged in a communication pipes of the above components, and each pressure sensor is connected with a data acquisition device. The experiment device is based on the principle of the integration of the well hole and the oil reservoir, takes the buffering characteristic of the well hole and the oil reservoir into full account, takes the storage effect of the well hole into account, and can simulate the whole process from foam injection to displacement.

Description

technical field [0001] The invention relates to a foam huff-puff and sand-discharging experimental device, in particular to a foam huff-puff and sand-discharging experimental device and method based on the integration of well bore and reservoir. Background technique [0002] Aiming at the problem of clogging in the near-wellbore area during the development process, the characteristics of the foam fluid itself are used to discharge the sand particles and blockages in the near-wellbore area through foam huff and puff, circulation and mixed discharge, so as to relieve the compound blockage in the near-wellbore area, improve the perforation blasthole, and improve The sand control effect of gravel packing and the purpose of improving seepage conditions in the near-wellbore area. Foam mixed flow reservoir stimulation technology is mainly used for two types of oil wells, one is old wells that are blocked near the wellbore during production, and the other is new wells that are about...

AI Technical Summary

Problems solved by technology

[0005] (1) The simulation type is single:

[0006] It can only simulate the seepage characteristics of foam displacement in the formation, but cannot simulate the flow characteristics in the wellbore, so it cannot completely simulate the entire process from injection to displacement;

[0007] (2) The assumptions are too idealistic:

[0012] It is only used to understand the characteristics of foam seepage, not combined with practical application

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