空气钻井钻具组合动力学特征及井斜机理研究  

Dynamic features of bottom hole assembly and borehole deviation mechanism in air drilling

作　　者：狄勤丰[1] 朱卫平[1] 姚建林[1] 赵业荣 雷桐 张汉林 

机构地区：[1]上海大学上海市应用数学和力学研究所,上海200072 [2]中国石油长庆石油勘探局,陕西西安710061

出　　处：《石油学报》2008年第6期917-921,共5页Acta Petrolei Sinica

基　　金：国家自然科学基金项目(No.50174047、No.50674065);上海市科委项目(061658035);上海市重点学科建设项目(Y0103)联合资助

摘　　要：研究了用牙轮钻头进行空气钻井时光钻铤钻具组合动力学特征及井斜机理,建立了光钻铤钻具组合的转子动力学模型,分析了空气钻井与泥浆钻井时光钻铤钻具组合动力学特征的区别。结果表明,高碰摩系数使空气钻井时钻具组合反向涡动,空气的低阻力使空气钻井的涡动速度增大。泥浆钻井则相反,钻具组合以较低的涡动速度向前涡动。这些特征的综合作用使得空气钻井时钻头上的降斜力小于泥浆钻井,成为引起空气钻井井眼易斜的主要原因之一。The dynamic features of bottom hole assembly （BHA） and mechanism of borehole deviation in air drilling were studied using slick drill collar. The dynamic model for rotor of slick BHA was established. The dynamic features of BHA under the conditions of mud fluid were compared to those of air drilling. The results show that the higher friction coefficients of borehole wall can result in a backward whirling motion of the BHA and lower damping coefficient of air makes the whirling speed higher in air drilling. The BHA in mud fluid drilling can whirl forward at a lower speed, due to the lower friction coefficients in the wall of borehole and higher damping coefficient of mud. The comprehensive function of these dynanfic features made a smaller deviation dropping on hit in air drilling than that in mud drilling, which leads to the deviation of drilled borehole in air drilling.

关 键 词：空气钻井 钻具组合 斗斜机理 动力学模型 涡动 

分 类 号：TE242[石油与天然气工程—油气井工程]