摘要
大宁-吉县区块多储层(煤层气、致密气、页岩气)共存,可在同一井筒实现3类天然气资源的开采。本文针对地层特性设计了多只PDC钻头,基于实测钻井轨迹建立考虑地层深度和岩性的钻柱动力学模型,对比机械钻速、振动和扭矩等方面表现确定最佳钻头设计方案,并对其进行水力结构优化。建立三维全井钻柱动力学模型对选用钻头开展钻井参数优化、钻具组合优选及选配套提速工具评价。最终设计研制的PDC钻头在二开井段的石盒子组至太原组地层开展钻井提速任务,累计进尺达422 m,整体机械钻速为6.62 m/h,钻头在钻遇高强度灰岩地层、致密砂岩和泥页岩地层时仍具有较高的机械钻速。文章形成了针对钻遇多气种、多目的层开展以钻井参数优化、钻头优化设计、钻具组合优化为核心的钻井提速方案。
Multiple reservoirs(coalbed methane,tight gas,shale gas)coexist in the Daning-Jixian block,allowing for the extraction of three types of natural gas resources in the same wellbore.This study designs multiple PDC drill bits based on formation characteristics,establishes a drilling dynamics model,considering formation depth and lithology based on measured drilling trajectories,compares the performance of rate of penetration(ROP),vibration,and torque to determine the optimal PDC bit design scheme,and optimizes its hydraulic structure.A three dimensional full well drill string dynamic model was established to optimize drilling parameters,select drilling tool combinations,and evaluate the selection of matching ROP-enhancing tools for the selected PDC bits.The PDC drill bit carried out drilling test in the second section of the well from the Shihezi Formation to the Taiyuan Formation,with a cumulative footage of 422 meters and ROP of 6.62 m/h.Moreover,the PDC bit still has high ROP when encountering high-strength limestone formations,tight sandstone formations,and shale formations.This study has developed a ROP enhancement plan focusing on drilling parameter optimization,PDC bit optimization design,and drilling tool combination optimization for encountering multiple gas types and multi-purpose layers during drilling.
作者
祝效华
刘伟吉
邓开创
刘洪涛
李柯
王勇
ZHU Xiaohua;LIU Weiji;DENG Kaichuang;LIU Hongtao;LI Ke;WANG Yong(School of Mechanical Engineering Southwest Petroleum University,Chengdu,Sichuan 610500,China;PetroChina Coal-bed Methane Co.,Ltd,Beijing 102200,China)
出处
《钻采工艺》
北大核心
2025年第3期70-76,共7页
Drilling & Production Technology
基金
国家自然科学基金杰出青年项目“钻井提速理论与方法”(编号:52225401)。
关键词
三气合采
PDC钻头
钻柱动力学
提速工具
钻井提速
three-gas co-production
PDC bit
drill string dynamics
ROP-enhancing tool
ROP enhancement
