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- W1965402555 abstract "Abstract The conventional PDC bits have seldom been successfully used in the inter-bedded formation since Shengli Oilfield was discovered in 1964. The inter-bedded formation contains hard dolomite, limestone stringers, abrasive sands etc. In this kind of formation, rocks alter between soft and hard quite frequently. Cutters of the PDC bit are prone to damage because of bit vibrations while drilling. This paper studies the characteristic of the inter-bedded formation in Shengli oilfield, analysis the damage reason of PDC cutters, presents a new method of cutting structure design and describes the work principle of it. According to the new design method, a new PDC bit with new cutting structure is developed, in which two or three types of cutter are arranged on each blade. These cutters are arranged in special way to protect each other while drilling, and then extends the bit life. In field tests, the new designed PDC bit was successfully used in inter-bedded formation drilling. Comparing with conventional roller cone bit(or PDC bit) used in same intervals, drilling footage of new designed bit increases by more than one time and ROP increases by 30-70%. Economic benefits have been achieved. The new designed bit is being widely used in Shengli Oilfield." @default.
- W1965402555 created "2016-06-24" @default.
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- W1965402555 date "2000-06-19" @default.
- W1965402555 modified "2023-09-27" @default.
- W1965402555 title "New Cutting Structure Design Improves the Performance of the PDC Bit" @default.
- W1965402555 cites W2043433693 @default.
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- W1965402555 doi "https://doi.org/10.2118/62858-ms" @default.
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