Three-dimensional single-well gas injection oil replacement simulation experiment device for fracture-cavity reservoir

Abstract

The invention relates to a three-dimensional single-well gas injection oil replacement simulation experiment device for a fracture-cavity reservoir. The experiment device comprises a gas injection system, a fracture-cavity simulation system and an image collecting and information processing system, wherein the fracture-cavity simulation system is communicated with the gas injection system, and the image collecting and information processing system is used for collecting, transmitting and processing image and data information of the fracture-cavity simulation system. The fracture-cavity simulation system comprises a plurality of karst cave models, a plurality of fracture models and a plurality of wellbore models, wherein the fracture models are used for allowing every two adjacent karst cave models to be connected in series; the wellbore models are communicated with the gas injection system, all the karst cave models and all the fracture models. The image collecting and information processing system comprises a plurality of particle imaging test modules and image collecting modules, wherein the particle imaging test modules are arranged in all the karst cave models respectively, and the image collecting modules are arranged on the periphery of the fracture-cavity simulation system. The experiment device can accurately and visually monitor the migration speed, pressure and time, in the gravitational differentiation process, of the three phases comprising oil, gas and water in karst caves, fractures and wellbores in real time, and therefore the experiment device can be widely used in research, development and production of oil and gas fields.

Description

technical field [0001] The invention relates to the field of oil and gas field development simulation, in particular to a three-dimensional single-well gas injection and oil replacement simulation experiment device for fracture-cavity reservoirs. Background technique [0002] Fracture-cavity carbonate reservoirs contain multiple media such as pores, caves, and fractures, and have complex structures. Such reservoirs have strong heterogeneity, and oil, gas, and water are distributed among them, and the fluid flow characteristics complex. [0003] In the reservoir development, in order to obtain a higher and stable recovery rate, water injection is used for oil recovery, and some single well constant volume units are also developed by "water injection instead of oil", and good results have been achieved. However, after multiple rounds of water injection to replace oil, the secondary oil-water contact has been continuously lifted, so it is difficult to recover the crude oil loc...

AI Technical Summary

Problems solved by technology

However, the existing physical model of gas injection for oil replacement only stays on the long core, which is only a manifestation of the local morphological characteristics of the reservoir, and cannot meet the large-scale and full three-dimensional requirements of the actual reservoir.

[0005] So far, there is no complete physical experimental model specifically for the development process of gas injection for oil and the differentiation law of each phase fluid after decompression. Simulation studies cannot accurately measure the interface between each phase

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