Prediction Model of Build Rate of Push-the-Bit Rotary Steerable System

Wang Meishan; Li Xiaojun; Wang GeHuang WenjunFan YongtaoLuo WeiZhang JiangeZhang JunfengShi Xiaolei

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Prediction Model of Build Rate of Push-the-Bit Rotary Steerable System

机译：Prediction Model of Build Rate of Push-the-Bit Rotary Steerable System

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The accurate prediction of build rate of rotary steerable system (RSS) is the prerequisite for the precise control of wellbore trajectory and optimal design of the steerable tool. Push-the-bit RSS refers to a steerable drilling system that controls well trajectory through adjustment of stretch length of pushing block. Based on this feature, a three-dimensional mechanical model of push-the-bit RSS is established on the basis of the conventional steerable tool mechanical model while considering pushing force. Meanwhile, the effects of bit cutting performance and formation anisotropy are considered. Next, the lateral force method, inclination trend angle method, and ultimate build rate method based on zero lateral force are analyzed and a new ultimate build rate method based on zero lateral drilling penetration is built. A conversion coefficient is introduced to reflect the ratio of actual build rate to theoretical build rate. At last, the new model is applied to a case study. The new method is superior to other previous methods, because the effects of bit-rock interaction and actual drilling process are sufficiently considered. The influence mechanism of build rate includes "leverage effect," "pendulum effect," and "pushing effect." The build rate of steerable tool is a comprehensive outcome of various effects, of which the "pushing effect" plays a dominant role. With the increase of weight on bit (WOB), the proportion of "leverage effect" increases, while the proportion of "pushing effect" decreases, and therefore the build rate decreases.

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来源
《Mathematical Problems in Engineering: Theory, Methods and Applications》 |2020年第17期|4673759.1-4673759.9|共9页
作者
Wang Meishan; Li Xiaojun; Wang GeHuang WenjunFan YongtaoLuo WeiZhang JiangeZhang JunfengShi Xiaolei;
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作者单位

CNPC Oilfield Serv Co Ltd, Sci & Technol Informat Dept, Beijing 102206, Peoples R China;

CNPC XIBU Drilling Engn Co Ltd, Engn Technol Res Inst, Urumqi 830000, Peoples R China|China Petr Logging Co Ltd, Well Logging Technol Res Inst, Beijing 102206, Peoples R China;

China Univ Petr, Sch Petr Engn, Beijing 102249, Peoples R ChinaChina Petr Logging Co Ltd, Well Logging Technol Res Inst, Beijing 102206, Peoples R China|CNPC BOHAI Drilling Engn Co Ltd, Engn Technol Res Inst, Tianjin 300457, Peoples R ChinaChina Petr Logging Co Ltd, Well Logging Technol Res Inst, Beijing 102206, Peoples R China|China Petr Logging Co Ltd, Logging Drilling Ctr, Xian 710000, Peoples R China;

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Prediction Model of Build Rate of Push-the-Bit Rotary Steerable System

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