Experimental device and special model system for simulating gas-assisted steam thermal oil recovery in heavy oil reservoirs

Abstract

The invention discloses an experimental device for simulating heavy oil reservoir gas auxiliary steam thermal oil recovery and a special model system of the experimental device. The model system consists of a cylinder body. Openings at both ends of the cylinder body are respectively matched with an upper cover and a piston in a sealing mode. The piston is fixed on the cylinder body through a piston fixed pressing cap. At least one fluid in-out hole is formed in the upper cover, and the fluid in-out hole extends to a cavity of the cylinder body and connected with a well model connecting port. The well model connecting port is used for connecting well models. At least one data acquisition port is arranged on the cylinder body. The data acquisition port extends to the cavity of the cylinder body, the piston fixed pressing cap is provided with a liquid inlet, and the liquid inlet extends to a cavity between the piston and the piston fixed pressing cap. The experimental device can carry out precise experiments over a production increasing mechanism and an effect of gas improving steam stimulation and steam drive, the experimental results are genuine and believable, and the device has an important significance for gas auxiliary steam thermal oil recovery and development.

Description

technical field [0001] The invention relates to an experimental device for simulating gas-assisted steam thermal recovery of heavy oil reservoirs and a special model system thereof, belonging to indoor physical simulation experimental devices in the field of oil and gas field development. Background technique [0002] The high viscosity of crude oil has become the main factor restricting the development of heavy oil fields. It is difficult to develop heavy oil fields economically and effectively by using conventional technologies. However, the viscosity of heavy oil is very sensitive to temperature. As the temperature rises, the viscosity drops sharply. It has become the main method of heavy oil production at present. Due to the limited amount of steam injection and heat carrying capacity of steam, the heating radius of the reservoir is limited. Domestic and foreign theoretical and field test studies have shown that mixed injection of steam and gas into the formation is an e...

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Problems solved by technology

The displacement experiment is mainly applied to the one-dimensional sand-packing tube experiment. The one-dimensional sand-packing tube experiment can only simulate the linear displacement experiment, which is quite different from the actual development status of the on-site gas-assisted steam huff and puff and subsequent transfer flooding. The experimental results can be used for reference. It is not meaningful

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