Zhu Keshang, Ma Huifang, Zhang Ruiwang. DRILLING FLUID TECHNOLOGY USED IN CB30A-1 well[J]. Oil Drilling & Production Technology, 2003, 25(3): 24-26. DOI: 10.3969/j.issn.1000-7393.2003.03.007
Citation: Zhu Keshang, Ma Huifang, Zhang Ruiwang. DRILLING FLUID TECHNOLOGY USED IN CB30A-1 well[J]. Oil Drilling & Production Technology, 2003, 25(3): 24-26. DOI: 10.3969/j.issn.1000-7393.2003.03.007
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DRILLING FLUID TECHNOLOGY USED IN CB30A-1 well

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  • CB30A-1 well is a direction well based on the area of CB30,with bottom dept at 4303.88m.The purpose is exploring buried hill reservoir.Different drilling fluid system were selected based on different formation characteristic.In the upper formation,polymer drilling fluid is used.In the below formation,no-solids polyol drilling fluid is used.Lost circulation was encountered when reached at 4220.44m,losing rate is 48m3/h.subsequence,no-plugging and protecting reservation drilling technology was applied to achieve the fourth drilling.Results reveal polymer drilling fluid has strong shale inhibition,cutting transportation,hole stabilization abilities.No-solids polyol drilling fluid has better high-temperature resistance and lubricity,sloughing prevention and formation damage prevention.
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