Coalbed methane (CBM) wells usually are dewatered with sucker rod or progressive cavity pumps to reduce wellbore water levels, although not without problems. This paper describes high-volume artificial-lift technology that incorporates specifically designed gas-lift methods to dewater Black Warrior CBM wells. Gas lift provides improved well maintenance and production optimization by the use of conventional wireline service methods.
Historically, well drilling operations have been based exclusively on steel pipe. Recently a well construction system that incorporates composite coiled-tubing technology has been introduced. This paper examines this system and its implications for the future, with specific emphasis on composite issues: the pipe and connectors. This revolutionary full-system development encountered numerous challenges, many of which are related to the unique properties of composite pipe in difficult hole conditions. The technological solutions to these challenges are examined in depth.
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