Research and application of intelligent recovery technology for Fanzhuang high rank CBM wells

Wells in Fanzhuang high rank CBM fields in Qinshui Basin vary a lot in geological conditions and recovery conditions, so we could not adopt the same recovery system and control model. In view of this, intelligent control and recovery technology applicable for CBM wells is studied. Based on summarizing and exploring the recovery law, intelligent control principle which is dominated by closed loop control technology with variable frequency is applied, as a result, intelligent control of flowing bottom hole pressure and recovery system of CBM wells are fulfilled. Application of the technology in 10 well including rod-pumped wells, submersible electric centrifugal pump wells, surface drive screw pump wells, etc. shows that the intelligent recovery technology has such advantages as high adaptability to different working conditions, good self-regulated performance, high efficiency in executing recovery system. It has broad application prospect in CBM development.