A new design of automatic vertical drilling tool

Abstract

In order to effectively improve penetration rates and enhance wellbore quality for vertical wells, a new Automatic Vertical Drilling Tool (AVDT) based on Eccentric Braced Structure (EBS) is designed. Applying operating principle of rotary steering drilling, AVDT adds offset gravity block automatic induction inclination mechanism. When hole straightening happens, tools take essentric moment to be produced by gravity of offset gravity lock to control the bearing of guide force, so that well straightening is achieved. The normal tool's size of the AVDT is designed as 215.9 mm，other major components' sizes are worked out by the result of theoretical analysis, including the offset angle of EBS. This paper aims to introduce the structure, operating principle, theoretical analysis and describe the key components' parameters setting of the AVDT.

Keywords

Automatic vertical drilling tool / Eccentric braced structure / Well deviation control / Well straightening

References

[1] Han Laiju, Ni Hongjian, Development of mechanical tool for automatic vertical drilling, Acta Pet. Sin. 29 (5) (2008) 766-768.

[2] Sun Feng, Lv Guanyun, M.A. Qingming, A strap-down automatic vertical drilling system, Acta Pet. Sin. 32 (2) (2011) 360-363.

[3] Yan Wenhui, Peng Yong, Zhang Shaohuai, Mechanism of rotary steering drilling tool, Acta Pet. Sin. 26 (5) (2005) 94297.

[4] B.H.Z. Yongqiang, Application of verti trak in Chuanke-1 well, Pet. Drill. Tech. 2 (2008) 007.

[5] Yuxi Han, Tao Liu, Application of deviation control and fast drilling technology in shengli oilfield block 373, Drill. Prod. Technol. 32 (2) (2009) 87-88.

[6] Wang Yan, Liu Baiyan, PWM control of the anti-deviation mechanism in the vertical drilling system[J], Pet. Drill. Tech. 02 (2015) 120-125.

[7] Xu Chao, Xia Hongnan, The technology of power-V and practical application[J], Yangtze University Natural Science, Sci. Eng. (2012) 104-106.

[8] Feng Liu, Power-v and pd-xceed vertical guide drilling technology applied in bohai oilfield, Oil Drill. Prod. Technol. 31 (2009) 29-32.

[9] Junliang Zhang, Ke Xiao, Brief introduction of rotary steerable systemspower-v drilling technical application, West-China Explor. Eng. 20 (2008) 79-82.

[10] Pingli Liu, Yinsheng Feng, Technical status and challenges of shale Gas development in sichuan Basin, China, Petroleum 3 (2015) 1-7.

[11] Xiangchao Shi, Yingfeng Meng, Confined compressive strength model of rock for drilling optimization original research article, Petroleum 3 (2015) 40-46.

[12] Jiang Dong Xia, Jing Zhou, Sheng Fu Xin, Stability controlling model of built in eccentric directional controller, J. Xi'an Pet Inst. Nat. Sci. Ed. 15 (1) (2000) 44-49.

[13] Yan Wenhui, Peng Yong, Shi Hongxun, The design of working fluid control distribution in rotary steering drilling tool, Drill. Prod. Technol. 28 (5) (2005) 69-72.

[14] Tang Xikuan, Jin Dewen, Mechanical Dynamics,China Higher Education Press, Beijing, 1983.