In the course of oil drilling, high-quality drill bits play a vital role in reducing cost and improving drilling efficiency. A new hybrid single cone bit was designed by connecting the teeth palm with conical tooth and the cone with PDC teeth. The hybrid single cone bit was added with the PDC teeth based on general single cone bit, which broke rock by shocking and shearing. The big end of hybrid single cone passed through the center of bottom hole, and all teeth rings contacted with wall of hole which could achieve gauge protection during rock breaking. A finite element model of interaction between hybrid single cone bit and rock was established, and the bottom hole model, the main cutting force and rock breaking volume were simulated and analyzed. Bench test was carried out to verify the drilling pressure and the drilling depth which were obtained by the numerical simulation. Research results showed that the drilling pressure and the drilling depth obtained by numerical simulation conformed to bench test results, and the regulation of rock breaking load was consistent with the design characteristics of the cone bit structure. Comparing with the spherical single cone bit, the side force of hybrid single cone bit was reduced by 39.6%, and the rock breaking efficiency increased by 33%. The stability was higher when drilling using the hybrid single cone bit, and it could reduce the probability of well deviation as well. According to the results, the numerical simulation is effective to study the rock breaking law of the hybrid single cone bit, which provides a basis for further design and performance evaluation of the drill bit.
DENG Rong, HOU Kai, LI Meng-hua, LI Xiang-dong. Study on rock breaking performance of hybrid single cone bit. Chinese Journal of Engineering Design, 2018, 25(3): 262-269.
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