TAILIEUCHUNG - Acoustic Waves From Microdevices to Helioseismology Part 5

Tham khảo tài liệu 'acoustic waves from microdevices to helioseismology part 5', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 148 Acoustic Waves - From Microdevices to Helioseismology track to reach the underground targets. In rotary drilling the forming of wellbore its trajectory is the result of the rock-bit interaction. In this interaction the drill bit anisotropy and its mechanical behavior . the drill bit force and tilt angle are important factors that can directly affect the well trajectory. The mechanical behavior depends on by the bottom hole assembly BHA analysis. Accordingly principal factors influencing the well trajectory generally contain BHA drill bit operating parameters in drilling drilled wellbore configuration and the formations to be drilled. Of which the BHA drill bit and operating parameters in drilling are the factors that can be artificially controlled and the formation property such as rock drillability and its anisotropy is the objective factor which can not be changed by us. The trajectory can be predicted before drilling and also can be determined after drilling through surveys and calculations. Besides the drilled wellbore will not only generate a strong reaction on the drill bit force and the drillstring deflection but also will exert an influence on the anisotropic drilling characteristics of the formation. Due to the above-complicated factors the hole deviation is always inevitable which may seriously influence the wellbore quality and the drilling performance. The well trajectory control is the process which forces drill bit to break through formations along the designed track forward by applying reasonable techniques. The anisotropic drilling characteristics of the drill bit the formation and their interaction effects are the factors which will cause a direct influence on the well trajectory control. Thereby it is a complicated scientific and technological problem for us how to make the cognition evaluation and utilization of anisotropic drilling characteristics of the formation as well as the prediction control of mechanical action of the drill bit on

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