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| A new rotary steering method for controlling wellbore trajectory by combining pushing and pointing forces on drill bit |
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LIU Yongwang1,2,3, GUO Fugui4, GUAN Zhichuan1,2,3, QIN Xiaobing1,2,3
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(1.School of Petroleum Engineering in China University of Petroleum (East China), Qingdao 266580, China;2.Key Laboratory of Unconventional Oil and Gas Development(China University of Petroleum (East China)), Ministry of Education, Qingdao 266580, China;3.Shandong Deep Drilling Process Control Engineering Technology Research Center, Qingdao 266580, China;4.Northwest Oilfield Branch of SINOPEC, Urumqi 830011, China)
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| Abstract: |
| The main working principle of the pushing bit rotary steering drilling system is via the so called "speed lever" mechanism. But, due to the limitation of the method, it has become a "strangle" problem to further improve trajectory control ability, prolong service life and increase drilling speed. In this study, a new rotary steering method based on the principle of "force-reducing lever" was proposed, and a finite element analysis model of trajectory control ability was established. The effectiveness of the new method was analyzed by comparing the three indexes of lateral pushing force, bit pointing angle and drilling trend angle obtained using a conventional push rotary steering drilling system. The results show that the new rotary steering method can increase the pushing force of the rotary steering tool by several times, achieving the purpose of combining with the pushing and pointing of the bit to control the wellbore trajectory, and providing space for the installation of speed-up tools without affecting the trajectory control ability and tool life. |
| Key words: rotary steering method trajectory control ability working life drilling speed speed lever force-reducing lever |
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