裂缝性地层H-B流型钻井液漏失流动模型及实验模拟  

Flow model and experimental simulation for leak-off of H-B flow-pattern drilling fluid in fractured formation

作　　者：李松[1,2] 康毅力[1] 李大奇[3] 唐龙[1] 杨建 刘雪芬[1,4] 

机构地区：[1]西南石油大学油气藏地质及开发工程国家重点实验室,成都610500 [2]中国石油西南油气田公司工程技术研究院,四川广汉618300 [3]中国石化石油工程技术研究院,北京100101 [4]陇东学院能源工程学院,甘肃庆阳745000

出　　处：《石油钻采工艺》2015年第6期57-62,共6页Oil Drilling & Production Technology

基　　金：国家重点基础研究发展规划(973计划)"深井复杂地层漏失与井壁失稳机理及预测"(编号:2010CB226705);国家科技重大专项"复杂地层漏失诊断及完井方法研究"(编号:2011ZX05005-006-008HZ);陇东学院青年科技创新科研项目(编号:XYZK1205)

摘　　要：随着油气勘探开发逐步面向深层、超深层、深水、高温高压高含硫及多压力层系等复杂地层,井漏问题异常严峻,严重迟滞了油气勘探开发进程。因此,开展钻井液漏失诊断研究,揭示钻井液漏失动态行为及其特征,对认识井漏和优化防漏堵漏技术有重要意义。建立了二维平面裂缝H-B流型钻井液漏失流动模型,揭示了钻井液漏失动态行为及其影响因素。研究结果表明,二维平面裂缝的纵横比、裂缝面积、延伸长度、裂缝变形及裂缝面倾角越大,钻井液漏失速率及累积漏失量则越大。钻井液稠度系数及动切力越大,钻井液漏失速率及累积漏失量则越小。利用高温高压钻井液漏失动态评价仪评价了0.5 mm和1mm缝宽的平面裂缝的钻井液漏失行为,与漏失模型模拟结果整体趋势吻合,误差小于25%,表明所建二维平面裂缝钻井液漏失流动模型具有一定的合理性。As the oil and gas exploration and development gradually shifts to complicated formations such as deep formation, super-deep formation, deepwater formation, high-temperature high-pressure & high-sulfur-content formation and multi-pressure formation, the problem of lost circulation becomes more and more serious, which greatly delays the progress of oil and gas exploration and development. Therefore, researching the diagnosis of leak-off of drilling fluid and revealing the dynamic behavior and characteristics of leak-off of drilling fluid are of great significance for understanding the lost circulation and optimizing the leakage prevention and sealing technologies. The flow model for leak-off of H-B flow pattern drilling fluid in 2-dimensional planar fracture has been established, and the dynamic behavior and affecting factors of leak-off of drilling fluid have been revealed. The research results indicate that, as the aspect ratio, area, extended length, deformation and surface inclination angle of 2-dimensional planar fracture increase, the leak-off rate and accumulative loss quantity of drilling fluid will increase. As the consistency factor and dynamic shearing force of drilling fluid increase, the leakage & loss rate and accumulative leakage quantity of drilling fluid will decrease. The dynamic evaluation instrument for leak-off of high-temperature & high-pressure drilling fluid has been used to test and evaluate the leak-off of drilling fluid in planar fracture of which the width is 0.5 mm and 1 mm respectively, and the result is consistent with the result simulated by leak-off model, with the error being less than 25%. This indicates that, the established flow model for leak-off of drilling fluid in 2-dimensional planar fracture is reasonable to a certain extent.

关 键 词：裂缝性地层 钻井液漏失 平面裂缝 H-B流型 漏失模型 漏失速率 漏失量 

分 类 号：TE254[石油与天然气工程—油气井工程]