An automatic coating technology of corrosion inhibitor for gas production well

Abstract

The invention discloses an automatic film coating process of corrosion inhibitor for gas production wells. First, the injection speed of corrosion inhibitor and the dosage of corrosion inhibitor required for coating film of corrosion inhibitor are calculated based on the relevant production parameters of the gas production well; the relevant coating is controlled by a PC. The membrane equipment injects the required corrosion inhibitor into the annular space of the oil jacket, and then injects it into the tubing string from the corrosion inhibitor injection valve. Under the high-speed airflow, a stable annular liquid film is formed along the inner wall of the tubing string, and it is continuous and uniform. The flow returns to form a uniform protective film on the inner wall of the tubing string. The invention can make the coating of the corrosion inhibitor on the inner wall of the tubing string more evenly, and the integrity of the corrosion inhibitor film is better; the consumption of the corrosion inhibitor can be effectively reduced, and the protection cost of the downhole tubing string of the gas production well can be saved; Adjusting the injection amount of the corrosion inhibitor realizes the automatic coating of the corrosion inhibitor and improves the protection efficiency of the wellbore.

Description

technical field [0001] The invention relates to the technical field of oil and gas well safety, in particular to an automatic film coating process of a corrosion inhibitor for gas production wells. Background technique [0002] The tubing and casing string is the necessary channel for natural gas to move from the bottom of the well to the surface. During gas production, CO contained in natural gas 2 , H 2 S and other corrosive gases will cause corrosion damage to the tubing string in the process of migrating from the tubing string to the surface with the natural gas, thereby destroying the integrity of the wellbore, further reducing the service life of the downhole tubing string and even endangering the safety of the wellbore, affecting the normal production of gas wells and causing huge Economic losses. In view of the corrosion problem of the sour gas well tubing string, corrosion-resistant alloy pipes are currently mainly used to realize the safe production of the wellb...

AI Technical Summary

Problems solved by technology

However, this method requires modification of existing wellhead devices and downhole pipe strings, which increases operating procedures and costs. At the same time, the method of automatic smearing of corrosive media will affect the normal production of gas wells when implemented

There are also experimental methods to clarify the type of corrosion inhibitor, the installation position of the injection valve, the injection amount of the corrosion inhibitor, the pre-coating time and the pre-coating cycle, which is helpful for the optimization of the gas well anti-corrosion process, but no specific process parameters and corrosion inhibition are given. Calculation method of liquid consumption

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