Gas injection oil production process in double-layer oil pipe

Abstract

The invention discloses a gas injection oil production process in a double-layer oil pipe. The gas lift process comprises the following steps that a small oil pipe is put into a main oil pipe, and a gas lift valve is arranged on the small oil pipe; nitrogen or natural gas is injected into the small oil pipe; and oil is discharged from the annular spaces of the small oil pipe and the main oil pipe,and gas lift production is carried out. The process has the beneficial effects that when a conventional gas lift pipe column is injected with nitrogen or natural gas, the outer wall of an oil pipe and a casing pipe are seriously corroded, the casing pipe can be well protected from being corroded, and oxygen-containing gas does not directly contact the casing pipe; a gas exchange lifting pipe column or a gas injection pipe column of an original well production pipe column is avoided, the well repairing period is reduced, the yield is improved, and the operation cost is saved; and later leakagefinding, leakage blocking and channeling plugging workover are reduced, and operation cost is saved.

Description

technical field [0001] The invention belongs to the technical field of gas lift production, and in particular relates to a gas injection and oil production process in a double-layer oil pipe. Background technique [0002] In the production process of many self-spraying oil and gas wells in the oilfield, due to the accumulation of liquid in the wellbore or the production string of the formation water, the self-spraying cannot be performed. way of production. [0003] Gas lift oil recovery: relying on the high-pressure gas injected from the surface into the well to mix with the fluid produced from the oil layer in the wellbore, the expansion of the gas is used to reduce the density of the mixed liquid in the wellbore, and the crude oil flowing into the well is lifted to the surface. [0004] Run the small tubing + in-pipe concentric gas lift valve into the existing production tubing string to implement secondary completion, inject nitrogen or natural gas into the small tubing...

AI Technical Summary

Problems solved by technology

[0008] The object of the present invention is to provide a gas injection and oil recovery process in double-layer tubing to solve the serious corrosion of the outer wall and casing of the tubing when nitrogen or natural gas is injected into the existing gas lift string proposed in the background art; Existing production strings are ventilated and lifted strings or gas injection strings, and the strings are frequently lifted

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