摘要
推靠式旋转导向工具的防斜、稳斜能力强,能基本满足复杂地层安全高效钻进的需要,但目前的造斜率预测方法没有考虑推靠块控制方式及钻进过程的影响,存在造斜率预测精度低的问题。为此,考虑导向工具的结构特性,建立了静态推靠式旋转导向控制模型,给出了可靠的导向力控制方案,利用下部钻具组合力学模型及钻头–地层相互作用模型,得到了基于零侧向钻速条件下的造斜率预测模型,并引入折算系数对造斜率预测结果进行了修正。实例计算及敏感性分析结果表明,该方法预测精度高,能够满足井眼轨迹精确控制的需要;导向合力、钻压、钻头与稳定器的距离对推靠式旋转导向工具的造斜能力影响显著,现场施工时为了充分发挥导向合力的作用,要适当减小钻头与稳定器的距离、降低钻压,以提高旋转导向工具的造斜能力。研究结果为旋转导向钻具组合优选、钻井参数优化等提供了理论依据。
The push-the-bit rotary steerable tool(RST)has strong anti-inclination ability,which can basically meet the needs of safe and efficient drilling in complex formations.However,the current prediction method of build-up rates does not fully consider the influence of push-the-bit unit control and drilling process and has low prediction accuracy of build-up rates.Therefore,In view of the structural characteristics of the steering tool,a static push-the-bit rotary steerable control model was established,and a reliable steerable force control scheme was given.By using the bottom hole assembly(BHA)mechanics model and the bit-formation interaction model,a prediction model of build-up rates based on the zero lateral rate of penetration was obtained,and the conversion coefficient was introduced to correct the prediction result of build-up rates.The results of case calculation and sensitivity analysis show that the method has high prediction accuracy and can meet the need for precise control of borehole trajectory.The steerable force,weight on bit(WOB),and the distance between the bit and the stabilizer have significant effects on the deflecting ability of push-the-bit RST.In field construction,in order to give full play to the role of steerable force,it is necessary to shorten the distance between the bit and the stabilizer and reduce the WOB,so as to improve the deflecting ability of the RST.The research results can provide a theoretical basis for the optimization of rotary steerable BHAs and drilling parameters.
作者
秦永和
范永涛
陈文辉
刘越
李晓军
王舸
QIN Yonghe;FAN Yongtao;CHEN Wenhui;LIU Yue;LI Xiaojun;WANG Ge(China National Petroleum Corporation,Beijing,100010,China;China Petroleum Logging Co.,Ltd.,Xi’an,Shaanxi,710054,China;MOE Key Laboratory of Petroleum Engineering(China University of Petroleum(Beijing)),Beijing,102249,China)
出处
《石油钻探技术》
CAS
CSCD
北大核心
2023年第4期74-80,共7页
Petroleum Drilling Techniques
基金
国家自然科学基金项目“旋转钻柱动力屈曲临界条件与后屈曲蛇形摆动和螺旋涡动行为研究”(编号:51904317)
中国石油集团公司科研攻关项目“智能导向系统研发(二期)”(编号:2022T-005-001)联合资助。
关键词
旋转导向
导向钻井
推靠块
导向力
控制方案
造斜率
预测模型
rotary steering
steerable drilling
push-the-bit unit
steerable force
control method
build-up rate
prediction model
