A supercritical water flooding oil simulation device and method

Abstract

The invention relates to a supercritical water-oil displacement simulator and method. The supercritical water-oil displacement simulator comprises a high-pressure metering pump, an outlet of the high-pressure metering pump is connected with the pure water side of a crude oil middle piston container, the pure water side of a formation water middle piston container and the inlet end of a supercritical water generator at the same time, the oil side of the crude oil middle piston container, the formation water side of the formation water middle piston container and the outlet end of the supercritical water generator are connected with the inlet end of a core simulating device at the same time, the outlet end of the core simulating device is sequentially connected with a heat exchange system, a back-pressure adjusting device and a gas-liquid separating device, and the core simulating device is arranged in a temperature tracking and monitoring system which is used for adjusting temperature of the wall surface of the core simulating device so that a constant wall temperature boundary or adiabatic boundary can be formed on the wall surface. Constant temperature of a core can be achieved in the oil saturating process, adiabatic boundary conditions are formed in the oil displacement stage, energy loss of injected hot fluid can be avoided, the influence on test results by external heating is eliminated, and the simulator is suitable for researching the displacement rule of supercritical water-oil displacement.

Description

【Technical field】 [0001] The invention belongs to the field of energy and environment, and in particular relates to a supercritical water flooding oil simulation device and method. 【Background technique】 [0002] For oil reservoirs with deep burial depth and high crude oil viscosity, taking the deep heavy oil in the eastern Lukeqin area as an example, the burial depth exceeds 2000m, and the viscosity exceeds 4000cp, even reaching above 10000cp. Due to the high original formation pressure, it is difficult for ordinary steam boilers to inject steam , the mining efficiency is very limited. The injection pressure of supercritical water exceeds 22.1MPa, which can ensure the injection of hot fluid into the ground. At present, the supercritical water development method for heavy oil and extra heavy oil is still in the field test and exploration stage. To master the corresponding recovery mechanism, it needs supporting indoor simulation research . [0003] At present, the indoor s...

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Problems solved by technology

The existing research equipment cannot operate above the critical point parameter of water, and the research method is to place the one-dimensional tubular model directly in the constant temperature chamber, and then raise the temperature of the entire one-dimensional displacement model to the same temperature as that of the injected thermal fluid in advance. This is quite different from the low temperature of the original reservoir. This research method is more suitable for the determination of relative permeability curves, but not suitable for the study of displacement laws.

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