The Two-Phase Flow of Oil-Gas Multiple Rounds Injection-Production in the Reconstructed of Gas Storage with Oil-Ring Condensate Gas Reservoir

Abstract

ABSTRACT: There will be multiple rounds of oil and gas mutual displacement during the operation of the condensate gas reservoir with oil-ring. Up to now, the experimental research on the characteristics of two-phase flow in the industry mainly focuses on gas-water or oil-water mutual displacement. While, the construction and operation of gas storage reservoirs in condensate reservoirs with oil-rings will appear the phenomenon of two-phase flow of oil and gas, the indoor physical simulation method has been used to carry out the two-phase flow characteristics experiments of the actual reservoirs relative to the relatively high, medium, and low penetration cores of each of the eight times of the two-phase seepage characteristics of the mutual displacement of oil and gas. Studies the flow of oil-gas in two phases during the operation of gas storage, analyzes the influence of multiple rounds of oil-gas mutual displacement on the storage capacity of gas storage, grasps the changes of oil-gas flow under different permeability conditions, and optimizes the optimal reservoir suitable for the construction of gas storage. 1. INTRODUCTION As an important means of developing clean energy, underground gas storage has the characteristics of large capacity and low cost(Yuan et al, 2020). Generally speaking, there are two purposes for the construction of underground gas storage: one is to meet the gas demand and seasonal peak shaving needs of nearby urban residents, and the other is to serve as a strategic resource reserve. The construction and operation of gas storage has been relatively mature abroad, but it is still in the development stage in China(Ding, et al, 2020). For the construction of gas storage, foreign theories cannot be copied, and the construction of gas storages must be carried out based on my country's national conditions and local conditions (Zhang 2018, Yin 2013). During the operation of gas storage, it has the characteristics of alternating strong injection and extraction of gas, high-speed seepage of single well, large flow huff and puff fluid, etc. In order to ensure the normal operation of gas storage after built, it is necessary to study the relative permeability of gas storage fluid. At present, a large number of scholars have carried out indoor physical model experiments on the two-phase flow rules of gas-water mutual flooding in different types of gas storage, and there are few studies on the relative permeability of oil-gas mutual flooding in gas storage.