title: Numerical simulation study on the optimization design of the crown shape of PDC drill bit.
abstract: The design of bit crown is an important part of polycrystalline diamond compact (PDC) bit design, although predecessors have done a lot of researches on the design principles of PDC bit crown, the study of the law about rock-breaking energy consumption according to different bit crown shape is not very systematic, and the mathematical model of design is over-simplified. In order to analyze the relation between rock-breaking energy consumption and bit crown shape quantificationally, the paper puts forward an idea to take "per revolution-specific rock-breaking work" as objective function, and analyzes the relationship between rock properties, inner cone angle, outer cone arc radius, and per revolution-specific rock-breaking work by means of explicit dynamic finite element method. Results show that the change law between per revolution-specific rock-breaking work and the radius of gyration is similar for rocks with different properties, it is beneficial to decrease rock-breaking energy consumption by decreasing inner cone angle or outer cone arc radius. Of course, we should also consider hydraulic structure and processing technology in the optimization design of PDC bit crown.
authors.affiliation: MOE Key Laboratory of Petroleum Engineering in China, China University of Petroleum, Beijing, 102249 China.
authors.forename: Pei
authors.initials: P
authors.lastname: Ju
authors.affiliation: MOE Key Laboratory of Petroleum Engineering in China, China University of Petroleum, Beijing, 102249 China.
authors.forename: Zhenquan
authors.initials: Z
authors.lastname: Wang
authors.affiliation: MOE Key Laboratory of Petroleum Engineering in China, China University of Petroleum, Beijing, 102249 China.
authors.forename: Yinghu
authors.initials: Y
authors.lastname: Zhai
authors.affiliation: MOE Key Laboratory of Petroleum Engineering in China, China University of Petroleum, Beijing, 102249 China.
authors.forename: Dongyu
authors.initials: D
authors.lastname: Su
authors.affiliation: MOE Key Laboratory of Petroleum Engineering in China, China University of Petroleum, Beijing, 102249 China.
authors.forename: Yunchi
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: MOE Key Laboratory of Petroleum Engineering in China, China University of Petroleum, Beijing, 102249 China.
authors.forename: Zhaohui
authors.initials: Z
authors.lastname: Cao
keywords: Bit crown; Numerical simulation; PDC drill bit; Per revolution-specific rock-breaking work