Geometric properties and three-dimensional rock-breaking mechanics of a new ring-embedded PDC drill bit
TIAN Jia-lin1,2, LIU Gang1, LIU Si-lu1, ZHOU Kun1, HUANG Jun-hang1, SUN Ye1, LIU Yan-qiu1, YANG Jia-jun1
1. School of Mechatronic Engineering, Southwest Petroleum University, Chengdu 610500, China;
2. School of Mechanical Engineering, Southwest Jiaotong University, Chengdu 610031, China
In order to overcome the adverse phenomenon of polycrystalline diamond layer peeling off and passivation serious when integrated polycrystalline diamond compact (PDC) suffers overload, which results in the rapid decline in its cutting function, a new embedded PDC is presented. Based on the uniform-style design concept and triangle stable property in regular hexagon, a ring-embedded PDC of which six teeth surround with central tooth was designed. It was embedded in the new drill bit shoulder to test its cutting performance. Meanwhile, combined with field test, the wear property between new PDC drill bit and general PDC drill bit was compared. The results showed that:the embedded tooth and carbide matrix were combined by brazing welding, which not only exerted the high abrasion resistance of polycrystalline diamond layer, but also combined with the good impact performance of carbide matrix. Compared with general PDC, the ring-embedded PDC had stronger "eating ability", meanwhile, different polycrystalline diamond layers would participate in cutting rock which effectively avoided the stress concentration phenomenon of integrated PDC. According to the established 3D cutting mechanical model, the rock local displacement-stress parameter under the action of shear stress was solved. Additionally, the analysis model could be applied to other types of PDC via adjusting the embedded programs. The research results will provide important reference value for the research of PDC wear law, cutting performance and the research of new PDC drill bit.
TIAN Jia-lin, LIU Gang, LIU Si-lu, ZHOU Kun, HUANG Jun-hang, SUN Ye, LIU Yan-qiu, YANG Jia-jun. Geometric properties and three-dimensional rock-breaking mechanics of a new ring-embedded PDC drill bit. Chinese Journal of Engineering Design, 2017, 24(1): 70-76.
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