Overflow and its prevention and control:An example from CNPC Chuanqing Drilling Engineering Company Limited
Oil and gas exploitation during the 13th Five-Year Plan was confronted with challenges of complex geological conditions and terrible wellbore situations as it advanced towards some fresh domains of deep to ultra deep or unconven-tional reservoirs.Secure development puts forward higher requirements for all process,equipment and staffs of well control.So,taken PetroChina Chuanqing Drilling Engineering Company Limited as an example,some difficulties to prevent and control overflow were figured out.Then,countermeasures were made exclusively from five aspects of management,process,equipment,informatization and emergency response through"densifying all-around well control management,perfecting control technologies,upgrading control equipment,boosting overall informatization,and enhancing emergency response abili-ty".Results show that(ⅰ)there exist profound control risks in the exploration of deep to ultra-deep petroleum,and the ge-ology and engineering integration in depth is a fundamental measure to increase the accuracy to predict reservoir pressure while decrease overflow risks;(ⅱ)the digital and information-oriented overflow prevention and control,as an essential de-velopment tendency,shall be expedited;(ⅲ)both upgrading and iteration of the control equipment are able to ensure this prevention and keep away from certain risks in those deep to ultra-deep wells,and the gradual equipment automation and intelligentization is critical in the future;and(ⅳ)professional control personals are the key to prevent and control overflow,and it is necessary to cultivate"management + on site"individuals in a row,and stress the post-skill assembly and ability promotion of base teams.
Ultra deepThree-high wellOverflow prevention and controlWell-control safetyGeology and engineering integration
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