Development Status of Drainage Gas Recovery Technology in High Sulfur Gas Wells

Abstract

Due to the particularity of its stratigraphic structure, Sichuan Basin is rich in natural gas resources. With the production of gas wells, effusion is bound to occur in the wellbore. Once water invasion occurs, it will lead to the decline of natural gas production and even shutdown of the wells. Therefore, timely drainage of water in the wellbore is the key to restoring gas well production. Because of the high sulfur content of natural gas in Sichuan Basin, the conventional gas well drainage measures are difficult to apply, and some special drainage measures need to be taken. This paper mainly reviews the development and present situation of drainage technology for gas wells with high sulfur content, and introduces four main types of high sulfur gas well drainage gas recovery technologies: plunger gas lift, tubing perforation, electrical submersible pump drainage gas recovery technology, and foam drainage gas recovery, and compares their applicability, advantages and disadvantages.