摘要
鄂尔多斯盆地东部气田深层煤岩气开发初期采用“储层专打”三开井身结构,施工过程存在钻井效率低、漏塌复杂矛盾突出、钻井周期长等问题,难以满足煤岩气水平井经济高效开发需求。为此,以提高钻井效率和控降故障复杂为目的,通过工程地质难点及区域地三压力预测分析,优化确定了地质工程必封点,开展了“导管+深表层”二开井身结构优化设计,研究形成了深表层大井眼快速钻井技术、井眼轨道优化设计及控制技术、储层综合地质导向钻井技术、分段钻井液体系优化等钻井提速关键技术,在现场应用完井10口,平均钻井周期36.71 d,较优化前缩短了55.52%,平均单井复杂时效65.8 h/井,较优化前降低了70.76%,平均钻机月速度3123 m/台月,较优化前提高117.03%,实践应用表明,“导管+深表层”二开井身结构及提速关键技术,能够解决塌漏矛盾问题,实现塌漏分治和提高钻井效率目的,为长庆油田深层煤岩气低成本高效钻完井技术提供理论指导与实践经验。
In the early stage of deep coa-rock gas development in the eastern gas field of Ordos Basin,the three spud wellbore structure of"special drilling for reservoirs"was adopted.During the construction process,there were problems such as low drilling efficiency,prominent contradictions between leakage and collapse complexity,and long drilling cycle,which were difficult to meet the economic and efficient development needs of coalbed methane horizontal wells.Therefore,for the purpose of ROP optimization and controlling and reducing faults and complexity,through the prediction and analysis of engineering geological difficulties and three pressures,the necessary sealing points for geological engineering were optimized and determined.The optimization design of the two-spud wellbore structure of"conductor pipe+deep surface casing"was carried out.Key drilling technologies for ROP optimization such as deep surface large-hole rapid drilling technology,wellbore trajectory optimization design and control technology,near-bit azimuth gamma guidance technology for reservoirs,and segmented drilling fluid system optimization were studied and formed.Ten wells were completed in field applications.The average drilling cycle was 36.71 days,shortening by 55.52%compared to before optimization.The average complex time efficiency per single well was 65.8 hours/well,reducing by 70.76%.The average monthly drilling speed of the drilling rig was 3,123 m/unit-month,an increase of 117.03%compared to before optimization.Practical applications show that the two-spud wellbore structure of"conductor pipe+deep surface casing"and key drilling technologies for ROP optimization can solve the contradiction problem of collapse and leakage,achieve the purposes of separate treatment of collapse and leakage and improving drilling efficiency,and provide theoretical guidance and practical experience for the low-cost and high-efficiency drilling and completion technology of deep coal-rock gas e in Changqing Oilfield.
作者
王运功
张汉信
倪华峰
陈元
贺会锋
石崇东
陈万明
史配铭
WANG Yungong;ZHANG Hanxing;NI Huafeng;CHEN Yuan;HE Huifeng;SHI Chongdong;CHEN Wanming;SHI Peiming(CNPC Chuanqing Drilling Engineering Co.,Ltd.,Chengdu,Sichuan 610051,China;Changqing General Drilling Company,CNPC Chuanqing Drilling Engineering Co.,Ltd.,Chengdu,Xi′an,Shaanxi 710018,China)
出处
《钻采工艺》
北大核心
2025年第3期62-69,共8页
Drilling & Production Technology
基金
中国石油川庆钻探工程有限公司长庆钻井总公司致密气藏工程技术中心重点科技计划项目“盆地东部本溪组8#煤岩层水平井储层安全快速钻完井关键技术研究”(编号:CQ2024B-8-18-3-Z)。
关键词
深层煤层气
储层专打
必封点
二开井身结构
井眼轨道优化
塌漏分治
deep coalbed methane
special drilling for reservoirs
necessary sealing point
two-spud wellbore structure
wellbore trajectory optimization
separate treatment of collapse and leakage
