柔性短节对RSBHA导向力特征的影响分析  

AFFECTION OF FLEX SUB'S POSITION AND LENGTH ON THE STEERING FORCE OF RSBHA

作　　者：王明杰[1] 狄勤丰[1] 王文昌[1] 胡以宝[1] 何保生[2] 李汉兴[2] 程载斌[2] 

机构地区：[1]上海大学,上海市应用数学和力学研究所,上海市力学在能源工程中的应用重点实验室 [2]中海石油研究中心

出　　处：《钻采工艺》2012年第1期52-55,11,共4页Drilling & Production Technology

基　　金：国家重大专项“大型油气田及煤层气开发”之课题“多枝导流适度出砂技术”(2008ZX05024-003)子课题:旋转导向钻井系统导向能力分析及结构优化技术;国家自然科学基金项目:空气钻井直井易斜机理及其控制技术研究(50674065),国家自然科学基金项目:深井、超深井钻柱的非线性动力学特性分析(51174130);上海市教委创新项目:高效率水平井岩屑床清除钻具研发(11CXY32);

摘　　要：旋转导向系统是实现井眼轨迹精确控制的核心工具,代表了当前井眼轨迹控制技术的最高水平。在带旋转导向工具的底部钻具组合(RSBHA)中,都带有柔性短节,但至今未发现有关柔性短节对旋转导向工具控制效果影响的文献。文章在建立了带位移工作方式旋转导向工具的底部钻具组合(RSBHA)的三维小挠度力学分析模型的基础上,加入柔性短节的连续条件,采用加权余量法对模型进行了求解。分析了柔性短节位置及长度对RS-BHA侧向力的影响规律,并对RSBHA进行了实例计算分析。静力学结果表明,在不同的RSBHA工作模式下,柔性短节长度和位置对钻头侧向力的影响规律不同,柔性短节材料对钻头侧向力的影响较小,而稳定器间距具有较大影响,国外公司的RSBHA结构已经过优化。Rotary steering drilling system is a key tool to realize accurate control of hole trajectory,which represents the highest level of hole trajectory control technology nowadays.There are always flex subs in the bottom hole assembly with rotary steering tool(RSBHA),but any literatures have not been found about it's affection on the steering ability of the rotary steering tool.The three-dimensional mechanical model of RSBHA under small deflection was established in this paper where the boundary conditions and continuity conditions of the bit,stabilizer,tangency point and the restriction of the hole wall were considered.According to the investigation of the RSBHA structure in foreign literatures,the continuity conditions of flex sub was taken into accounted also.On this basis,the affection of flex sub's position and length on the lateral force of RSBHA was analyzed,and an example was made.The results showed that the influence of flex sub's position and length on lateral force of bit was different under different working mode of RSBHA.The material of flex sub has little influence on steering force of bit,but the distance between stabilizers has major influence.The RSBHA of foreign company has already been optimized.

关 键 词：BHA 旋转导向工具 柔性短节 导向能力 

分 类 号：TE921.2[石油与天然气工程—石油机械设备]