Zhu Xiaohua,Deng Kaichuang,Liu Weiji,et al.Customized design and application of high ROP bit for deep shale gas[J].China Petroleum Machinery,2025,53(10):1-7.
Zhu Xiaohua,Deng Kaichuang,Liu Weiji,et al.Customized design and application of high ROP bit for deep shale gas[J].China Petroleum Machinery,2025,53(10):1-7.DOI: 10.12473/CPM.202503085.
Customized Design and Application of High ROP Bit for Deep Shale Gas
As the development scale of shale gas expands, improving the rate of penetration (ROP) of deep shale gas has become the key to improving development efficiency, and designing more targeted bit based on formation characteristics is an effective means to enhance drilling performance. In response to the ROP improvement demand of a shale gas well in Yuxi Block, the characteristics of target horizons were analyzed. Considering that the bit needs to penetrate multiple layers, the formation adaptability and impact resistance of the bit should be ensured. Based on the cutter layout optimization method from global force balanced model, a five-blade double-row-cutter PDC bit was designed, and a hybrid cutter layout strategy (combination of planar cutter and triple planar cutter) was used to enhance the drilling efficiency and impact resistance of the bit. Field application shows that the PDC bit achieves a single-run footage of 868 m in ø311.2 mm hole section, with an average ROP of 12.67 m/h, which is at least 16.65% higher than that of offset wells, showing excellent adaptability in deep shale gas development. This PDC bit integrates hybrid cutter layout design with a force-balanced optimization model, forming a customized PDC bit solution for complex formations in deep shale gas reservoirs, providing technical support for reducing drilling costs and enhancing development efficiency.
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