Physical simulation method and physical simulation experimental device for oil and gas charging of fracture-cave carbonate reservoir

Abstract

The invention provides a physical simulation experimental device for oil and gas charging of a fracture-cave carbonate reservoir. The physical simulation experiment device comprises a fracture-cave model, an experiment table with a window, surrounding rock and a camera shooting and monitoring system, wherein the fracture-cave model comprises simulation caves in different sizes and simulation fractures in different sizes, and the simulation caves are communicated through the simulation fractures; the fracture-cave model is arranged in the experiment table with the window, and the simulation caves in at least one side of the fracture-cave model are visible through the window of the experiment table; the surrounding rock surrounds the fracture-cave model to form the fracture-cave carbonate reservoir in a simulating manner; and the camera shooting and monitoring system is used for detecting and adjusting changes of both the flow rate and pressure in the charging process and recording images, displayed in the window, of the fractures and the caves in the charging process. The invention further provides a physical simulation method for oil and gas charging of the fracture-cave carbonate reservoir, and the physical simulation method employs the experimental device. According to the physical simulation method and the physical simulation experimental device for oil and gas charging of the fracture-cave carbonate reservoir, an oil-gas-water distribution rule can be obtained according to such parameters as karst, fractures, crude oil density and oil-gas-water distribution.

Description

technical field [0001] The invention designs a physical simulation method and experimental device for oil and gas filling in fracture-cavity carbonate rock reservoirs, and belongs to the technical field of petroleum gas exploration. Background technique [0002] Fracture-vuggy carbonate reservoirs are an important type of storage space in my country's oil and gas exploration. The storage and seepage space of this type of reservoir is mainly composed of caves with different sizes and geometric shapes and fractures with different widths. Fracture-cavity reservoirs are formed by karstification of carbonate rocks, with karst caves and vugs as the main storage space for oil and gas, and structural fractures and dissolved fractures as fluid flow channels. Due to the extremely complex combination relationship between fractures and caves, which shows strong heterogeneity, the fluid has a special seepage law when flowing in it. Physical simulation is an important means to study seep...

AI Technical Summary

Problems solved by technology

However, in general, the understanding of the hydrocarbon charging process in fracture-cavity systems, especially the simulation of hydrocarbon charging in super-core-scale large caves and fracture systems is still unclear.

Difficulties are mainly reflected in four aspects: ① Lack of systematic and effective experimental observation instruments and equipment, unable to monitor and record real-time changes in parameters such as flow velocity and pressure during oil and gas charging; The oil-gas accumulation system with karst caves as the main storage space is taken as the research object without considering the configuration relationship of fractures and caves as a whole; ③Research mostly focuses on how to improve the recovery rate of fracture-cavity reservoirs, while the oil and gas charging process There are very few studies on oil and gas fullness and oil and gas distribution

④Physical simulation is mainly based on two-dimensional models, which cannot reflect the real situation of oil and gas migration in three-dimensional space

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