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| Drilling rate model of cone bit in bottom hole and field application |
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LI Wei1, LI Ya-nan1, CHEN Shi-chun2, CONG Chang-jiang2, HUO Ming-yu1, YANG Bin1
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(1.College of Petroleum Engineering in Northeast Petroleum University, Daqing 163318, China;2.The Fourth Exploration Department, Tarim Oilfield Branch Company, Bohai Drilling Engineering Company Limited, Korla 841000, China)
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| Abstract: |
| Based on rock intrusive theory and considering the bottom hole pressure, the problems of rock breading of cone bit were studied, a drilling rate model in actual drilling was built. The results show that in the process of transition from soft, medium-hard to hard formation, drilling rate model can explain the problems of penetration rate of cone bit in different rock breaking ways. The invasion depths of conical insert and chisel teeth decrease exponentially with bit angle and fluid column pressure increasing, and conical insert is more obvious than chisel teeth. The calculation results of drilling speed of model are close to the data of drilling speed in field. The minimum euclidean distance is 25.8. |
| Key words: drilling oil and gas well engineering drilling rate equation cone bit rock breaking mechanism formation pressure |
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