Zeng Heng. THE FIRST TEST OF THE DIAMOND BI-CENTER CORING BIT SUCCESSFUL[J]. Oil Drilling & Production Technology, 1994, 16(4): 48-50. DOI: 10.3969/j.issn.1000-7393.1994.04.007
Citation: Zeng Heng. THE FIRST TEST OF THE DIAMOND BI-CENTER CORING BIT SUCCESSFUL[J]. Oil Drilling & Production Technology, 1994, 16(4): 48-50. DOI: 10.3969/j.issn.1000-7393.1994.04.007
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THE FIRST TEST OF THE DIAMOND BI-CENTER CORING BIT SUCCESSFUL

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  • According to the requirement of Chuan Zhong Oilfield,Chuan Shi-Christensen Co.Ltd has designed and manufactured the C201B bi-center coring bit and its diameter is 153 mm(6").Through three continuously coring tests between 3025 meters to 3066.48 meters in Jiao 57 well,the core recovery is 98.48% and the enlargement is 7.5%.Compared to the conventional coring bits and roller bits,the hole enlargement increased by 6.47 percent.This coincides with the design requirements.
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