Simulation Analysis on Mechanics of Bottomhole Assembly in Ultradeep Wells in Tahe Area
The efficient development of ultradeep oil and gas resources is of great significance for ensuring na-tional energy security and achieving energy replacement,and such resources represent a critical domain of explora-tion and development.In the Tahe area,the oil and gas resources are rich and buried deeply,revealing a huge potential.However,ultradeep well drilling is faced by challenges such as incapability of vertical drilling system at high temperature downhole,and poor anti-deviation capacity and low ROP of conventional drills.Based on the generalized vertical and horizontal bending method and the bit-formation interaction model,the anti-deviation per-formance of drill in adjacent wells were evaluated,and the formation dip angle,direction and anisotropy coeffi-cient were inverted.In order to provide field support for the ultradeep well TS-X,considering the characteristics of the Cambrian and Sinian strata,the impacts of different bottomhole assembly(BHA)structures on wellbore devia-tion were analyzed,a BHA including positive displacement motor(PDM)was designed,and an optimal structural scheme was formed.During field application,real drilling data were substituted to predict the anti-deviation capac-ity in a real-time manner,and an optimal weight on bit(WOB)parameter scheme was formed.The actual drilling results show that the use of optimized BHA has advantages such as good anti-deviation capacity and high rate of penetration(ROP),which verifies the correctness of the model and the rationality of the optimized design.The study results have important guiding significance for safe and efficient drilling and achieving anti-deviation and fast drilling of other ultradeep wells in the Tahe area.
ultradeep wellanti-deviation and fast drillingTahe areaBHA
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