纳林河地区深部煤层气水平井轨迹控制关键技术  

Key technologies for trajectory control in deep CBM horizontal wells,Nalinhe area,Ordos Basin

作　　者：乔博[1] 何鎏[1] 周国晓 李楠 QIAO Bo;HE Liu;ZHOU Guoxiao;LI Nan(Exploration and Development Research Institute,PetroChina Changqing Oilfield Company,Xi'an,Shaanxi 710018,China;No.6 Gas Production Plant,PetroChina Changqing Oilfield Company,Xi'an,Shaanxi 710018,China)

机构地区：[1]中国石油长庆油田公司勘探开发研究院,陕西西安710018 [2]中国石油长庆油田公司第六采气厂,陕西西安710018

出　　处：《天然气技术与经济》2024年第6期20-28,共9页Natural Gas Technology and Economy

基　　金：中国石油天然气股份有限公司科技专项“深地煤岩气成藏理论与效益开发技术研究”项目课题四“深地煤岩气开发优化设计关键技术研究”(编号:2023ZZ18YJ04)。

摘　　要：为了解决鄂尔多斯盆地纳林河地区深部煤层气水平井轨迹控制难度大、有效储层钻遇率低的问题,以JA-31NH6井为研究对象,综合钻井工程、测井、地质录井和三维地震分析,开展了“多因素考虑优选井位、多级标志层控制入靶、多手段精准导向”等水平井钻井关键技术研究。研究结果表明:①通过三维地震结合趋势构造精细刻画微幅度构造,并综合煤层厚度、成熟度和顶底板岩性等因素,优选水平井井位;②根据以毛儿沟灰岩为代表的6套标志层,逐级调整井斜精准入靶;③综合钻井、测井和录井等多种资料,尤其是近钻头方位伽马和元素录井等技术手段,建立纵向岩性组合剖面和各岩性综合参数表,准确分析钻遇岩性,判断钻头位置,精细水平段导向;④在水平段实施过程中,统筹考虑煤层厚度、微幅度构造、井眼轨迹和井筒质量等因素,地质地震工程一体化,精细调整水平段轨迹,提升水平井开发效果。结论认为,通过一系列技术攻关,JA-31NH6井煤层钻遇率从50.7%提高到91.6%,实现了该区深部煤层气水平井科学高效优快钻井,相关成果可以为其他地区深部煤层气水平井钻完井提供借鉴和参考。Most deep coalbed methane(CBM)horizontal wells in Nalinhe area are confronted with difficult trajectory control and low drilling rate in effective reservoirs.Therefore,taken JA-31NH6 well as an example,some key drilling technologies which include the multi-factor to optimize well location,the multi-marker to condition targeting,and the multimeans for precise steering were studied from drilling engineering,well logging,mud logging and 3D seismic exploration.Results show that(i)the micro-amplitude structure is exactly characterized through 3D seismic combined with trend structure,and the well location is optimized on the basis of CBM thickness,maturity,and roof and floor lithology;(ii)the deviation is fine-tuned for targeting in accordance with 6 marker beds represented by Maoergou limestone;(iii)both vertical profile of lithological combination and parameter tables of each lithology are established by making full use of drilling,welllogging and mud-logging data,especially near-bit azimuth gamma and elemental mud logging.And accurately,the drilled lithology can be analyzed,the bit position can be traced,and the horizontal section can be steered;and(iv)the CBM thickness,micro-amplitude structure,and wellbore trajectory and quality as a whole should be taken into consideration during drilling the horizontal section in an effort to improve the development effect by integrating geology with seismic engineering together with fine trajectory adjustment.As a result,the drilling rate is increased from 50.7% to 91.6%,which achieves the scientific,efficient,optimal and fast drilling in deep CBM horizontal wells in this area.These drilling technologies may provide reference for such deep CBM horizontal wells in other areas.

关 键 词：鄂尔多斯盆地 深部煤层气 水平井 井位优选 轨迹控制 

分 类 号：TE243[石油与天然气工程—油气井工程]