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中文摘要：
循环压降是指钻井过程中在钻井液循环系统中所产生的阻力损失。在泵压一定的条件下,降低循环压降是窄安全密度窗口条件下的重要技术之一。以宾汉流体为例,用理论计算的方法分析了密度、动塑比、润滑性和固相含量等钻井液性能对循环压降的影响规律。计算结果表明：在保证井壁稳定的前提下,降低钻井液密度可有效降低循环压降;一定的工程条件和一定的表观黏度对应着一个临界动塑比,此时的循环压降最小;当动塑比小于临界动塑比时,提高动塑比可以降低循环压降;提高钻井液的润滑性和降低固相含量,也可以降低循环压降。通过室内管内循环压降测试和松科1井（主井）钻井工程实例对上述结论进行了验证。分析结果对窄安全密度窗口条件下的钻井液设计具有重要的指导作用。
英文摘要：
Circulating pressure loss refers to the sum of pressure loss caused by flow resistance on drill pipe,drill collar,annular space,and in surface pipelines,etc.Under a certain pump pressure,decreasing circulating pressure loss is one of the important drilling technologies under narrow mud density window.Taking the Bingham fluid as an example and using theoretical calculations,the paper presents the effects of mud density,shearing thinning properties,lubricating property and solid content on circulating pressure loss.Calculation shows that,with the assurance of wellbore stability,decreasing mud density can effectively reduce circulating pressure loss.Certain engineering conditions and apparent viscosity corresponds to a critical ratio of yield point to plastic viscosity（YP/PV）,where the circulating pressure loss is minimum.When YP/PV is smaller than the critical ratio,increasing YP/PV ratio can reduce circulating pressure loss.Improvements of mud lubricating ability and reducing solid content can decrease circulating pressure loss.Lab circulating pressure loss tests and the application in Well CCSD-SK1 proved the above conclusions.The analysis results provide guidance to drilling fluid design under narrow mud density windows.
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