Chemical agent oil displacement whole-process physical simulation device and chemical agent oil displacement whole-process physical simulation method

Abstract

The invention relates to a chemical agent oil displacement whole-process physical simulation device and method, and the device comprises a visual pouring flat plate model which is provided with a sample feeding hole, a sampling hole and a sample discharging hole; the oil filling piston container and the water filling piston container are connected with the sample injection hole through a valve assembly; the constant-flux pump is used for pumping oil or water in the oil-filled piston container and the water-filled piston container to the visual pouring flat plate model; the sampling container and the pressure sensor are connected with the sampling hole and are used for analyzing the consumption condition of the chemical agent in the porous medium through the sample and monitoring the pressure condition near the sampling place; and the metering container is connected with the sample outlet hole and is used for collecting the flowing-out sample. The model is provided with a plurality of sampling and pressure measuring points, so that the consumption effects of adsorption, retention and the like of the chemical agent in the porous medium can be better evaluated, and the physical property change characteristics of the weakly cemented reservoir caused by sand migration can be evaluated through the pressure change of the measuring points.

Description

technical field [0001] The invention relates to a physical simulation device and method for the whole process of chemical agent flooding, and belongs to the technical field of petroleum and natural gas development. Background technique [0002] Weakly cemented reservoirs are widely distributed in my country's onshore and offshore oilfields, and affected by geological factors and development factors during the development process, there will be sand production in different degrees. At present, most oilfields have entered the stage of chemical flooding. Chemical flooding has become the main technology for tertiary oil recovery in various high water-cut oilfields because it can greatly improve the sweeping degree and oil displacement efficiency. In the process of chemical flooding in weakly cemented reservoirs, the rheology, viscoelasticity and other special physical properties of chemical agents will also increase the complexity of production analysis and dynamic prediction. ...

AI Technical Summary

Problems solved by technology

[0004] (1) During the chemical agent injection process, there will be a strong shearing effect due to the high flow rate near the bottom of the well. Limited by the shape rules of the model, it is impossible to simultaneously simulate the high flow rate area near the wellbore and the low flow area between wells

Due to the great difference in the properties of chemical agents at different flow velocities, it is difficult to objectively evaluate the oil displacement performance of chemical agents if the flow velocity distribution in the process of chemical flooding is not balanced.

[0005] (2) During the process of chemical agent migration inside the reservoir, there will be consumption phenomena such as adsorption, retention, and degradation, and the degree of consumption varies with different reservoir parts.

In the existing chemical agent consumption evaluation methods, the long core model is mostly used, and it is difficult to realize the intuitive evaluation of chemical agent consumption in different regions

[0006] (3) Sand migration occurs during the development of weakly cemented sandstone reservoirs, which will have a great impact on physical properties

Although the existing simulation device can realize the evaluation and analysis of the sand production phenomenon, it is difficult to realize the change characteristics of the liquid flow distribution caused by the sand control measures.

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