Top air injection gravity-assisted flooding oil-extraction one-dimensional physical simulation experimental system

Abstract

The invention discloses a top air injection gravity-assisted flooding oil-extraction one-dimensional physical simulation experimental system. The system comprises a sample injection system, a simulation system, an output system, a PC (personal computer) monitoring system and a gas chromatography analyzer, wherein the sample injection system comprises an ISO (international organization for standardization) high-precision metering pump, a dead oil piston container, a natural gas piston container and a sample preparation device; the simulation system comprises an ISO high-precision metering pump, a formation water piston container, an air piston container, a six-way valve, a baking oven, an inclination angle marking instrument and a sand filling pipe; the output system comprises a separator, a helium cylinder and a gas metering instrument; and the PC monitoring system comprises a PC monitoring computer and a gas flow rate and quality controller. By adopting the experimental system disclosed by the invention, the consistency between a sample and formation crude oil can be ensured, an experimental result is more realistic and reliable, the characteristics of the structure of the formation can be realistically simulated, the output system has a sample online monitoring function, and the real-time property and the degree of automation are further improved.

Description

technical field [0001] The present invention relates to the field of petroleum development, specifically a one-dimensional physical simulation experiment system for top air injection gravity assisted flooding oil recovery Background technique [0002] Gravity-assisted stable flooding with top gas injection is considered to be one of the most promising methods to effectively enhance the recovery of this type of reservoir, and its recovery is the highest among all immiscible flooding, even twice that of water flooding. Due to the difference in density between the injected gas and crude oil, it is possible to control the reasonable oil production rate and use gravity stability to keep the gas with lower density separated from the crude oil with higher density, so as to suppress gas fingering when fingering is about to form and avoid horizontal During the process of gas injection flooding, the viscous fingering of gas and the gravity overriding effect have the disadvantages of l...

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Problems solved by technology

[0005] 1) Cannot simulate formation dip and cannot represent real formation conditions

[0006] 2) Dead oil was used in the experiment, which cannot represent the actual oxidation characteristics of crude oil in the formation

[0007] 3) The model tube is placed horizontally, it is difficult to adjust the dip angle of the formation, it cannot represent the real formation conditions, and gas channeling is easy to occur, which reduces the reliability of the time results

[0008] 4) The device is not designed for air injection, so it does not consider the safety of the output mixture

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