Method for rebuilding gas storage reservoir and layered injection and recovery system

Abstract

The invention discloses a method for rebuilding a gas storage reservoir and a layered injection and recovery system. The method for rebuilding the gas storage reservoir comprises the following steps of acquiring formation parameters of an oil and gas reservoir; respectively arranging an gas injection and recovery well and an observation well on the oil and gas reservoir; tripping a layered water drainage tubular column in the observation well; performing perforation on different sections of the layered water drainage tubular column to form perforation sections; tripping a gas injection and recovery tubular column in the gas injection and recovery well to perform gas injection; performing a single layer test in the observation well to obtain a single layer test result; determining a gas production layer position according to the single layer test result; and closing the gas production layer position. By the method for rebuilding the gas storage reservoir and the layered injection and recovery system, the content of water in the oil and gas reservoir can be reduced effectively, and the storage capacity of the gas storage reservoir is increased.

Description

technical field [0001] The invention relates to the field of oil and gas reservoir reconstruction and development of a gas storage, in particular to a method for rebuilding a gas storage and a layered injection-production system. Background technique [0002] Underground gas storage is a way to store natural gas. Generally, the underground gas storage is to find a completely closed structure in the deep underground, and pump the natural gas into the structure on the ground for storage. When needed, the natural gas is extracted to the ground through production wells and delivered to users. Underground gas storage has the advantages of large gas storage capacity; high safety factor, not easy to cause fire and explosion; good economic benefits, and low gas storage cost compared with metal gas tanks. In addition, underground gas storage can coordinate the relationship between supply and demand and peak shaving, implement strategic reserves, ensure the reliability and continuit...

AI Technical Summary

Problems solved by technology

[0004] However, due to the inhomogeneity of formation development, especially the flow of gas in the oil layer tends to move toward the position with better permeability, when injecting natural gas into the injection-production gas well, it is likely that most of the effective gas will enter the aquifer in the formation Below, gas coning is caused, which not only wastes natural gas, but also cannot drive the water in the middle of the formation to the edge, and cannot reach the expected set storage capacity

Correspondingly, during the drainage process of the observation wells at the edge, the phenomenon of gas and water co-production often occurs in the observation wells, or even only gas is produced but not water, which eventually leads to the continuous high pressure of the gas injection and production wells that cannot be effectively injected, and the observation wells at the edge only produce gas and water. Gas production without water production cannot achieve the purpose of effective capacity expansion

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