双弯与三弯钻具对单弯钻具的等效问题  

PROBLEM OF DOUBLE AND TRIPLE BENT PDM EQUIVALENT TO SINGLE BENT PDM

作　　者：苏义脑[1] 唐雪平[1] 高兰[2] 

机构地区：[1]中国石油勘探开发研究院钻井所,北京100083 [2]辽河油田分公司钻采工艺研究院,辽宁盘锦124010

出　　处：《石油学报》2002年第2期77-81,共5页Acta Petrolei Sinica

基　　金：国家"八五";"九五"科技攻关项目 (85 2 0 4 0 2 0 2;95 1 0 8 0 1 0 3)

摘　　要：提出了把双弯钻具简化为等效单弯钻具的方法和公式 ,建立了适用于同向、反向双弯的统一表达式 ,并给出了把三弯 (多弯 )钻具简化为单弯钻具的分步等效方法。通过极限曲率法论述了钻头侧向力与极限曲率、造斜率等概念间的联系和区别。这些方法和成果可以解释所存在的理论疑点并用于指导水平井双弯 (多弯 )钻具的结构和性能设计。The method and formula of simplifying double bent PDM to equivalent single bent PDM is presented and the integrated equations applied to DKO and DTU are derived and a step equivalent method of simplifying double bent(mutibent) PDM to single bent PDM is provided.The difference and relationship between the deflecting force of bit and limiting curvature,build_up rate,etc in concept is discussed in this paper through limiting curvature method.These methods and results can be used to explain doubtful points of theory existed and to guide the design of structure and behavior of double bent(mutibent) PDM assembly in horizontal drilling.

关 键 词：双弯钻具 三弯钻具 单弯钻具 等效问题 石油钻具 水平井 极限曲率 造斜率 

分 类 号：TE921[石油与天然气工程—石油机械设备]