元坝气田超深酸性气藏钻完井关键技术

发布时间：2018-10-09 16:31

【摘要】：四川盆地元坝气田是近年来中石化发现的一个大型气田,是继普光气田之后天然气增储上产的又一个重点探区。元坝气田超深酸性气藏地质构造复杂,储层埋藏深,钻遇地层复杂,特别是陆相深部地层,属于高研磨性地层,机械钻速慢,钻井周期长。为此,经过多年的钻井实践和技术攻关,引进新工具、新技术,研制专用钻头,优化钻井设计,形成了针对该气藏的6项钻完井关键技术:(1)保证提速、安全完井作业的井身结构优化技术;(2)陆相上部地层气体钻井、陆相深部高研磨地层钻井提效技术体系;(3)气液转换、超深大斜度井及水平井润滑减阻、井壁稳定控制及防酸性气体污染技术等钻井液配套技术;(4)气体介质条件下固井、深井长封固段固井及超高压小间隙固井技术系列;(5)完善了以测量仪器、动力钻具优选及钻具组合设计等水平井井眼轨迹控制技术;(6)适合该气藏衬管完井方式和完井管柱优选技术。现场应用效果表明,系列关键技术有效地解决了机械钻速慢的难题,大幅度缩短了作业周期,实现了7 000 m井深水平井的提速提效的目标。
[Abstract]:Yuanba gas field in Sichuan basin is a large gas field discovered by Sinopec in recent years. The ultra-deep acid gas reservoir in Yuanba gas field is characterized by complex geological structure, deep reservoir burial and complex drilling, especially in the deep continental facies, which belongs to high abrasive formation, slow drilling speed and long drilling period. Therefore, after many years of drilling practice and technical research, the introduction of new tools and technologies, the development of special drill bits and the optimization of drilling design, six key drilling and completion techniques for this gas reservoir have been formed: (1) to ensure the increase of speed, Optimization of wellbore structure for safe completion operations; (2) gas drilling in upper continental facies and high abrasive formation in deep continental facies; (3) gas-liquid conversion, lubrication and drag reduction in ultra-deep and high inclination wells and horizontal wells, Drilling fluid matching technologies such as sidewall stability control and anti-acid gas pollution technology; (4) cementing technology series for deep well long cementing section and ultra-high pressure small clearance cementing technology under gas medium condition; (5) perfect measuring instruments, The horizontal wellbore trajectory control techniques, such as dynamic drilling tool optimization and drilling tool combination design, (6) are suitable for the gas reservoir liner completion mode and completion string optimization. The results of field application show that the series of key technologies can effectively solve the problem of slow drilling speed, shorten the working cycle and achieve the goal of raising speed and efficiency in 7 000 m horizontal wells.
【作者单位】：中石化西南石油工程有限公司;中石化西南石油工程有限公司钻井工程研究院;
【分类号】：TE2

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