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

李松 康毅力 李大奇 唐龙 杨建 刘雪芬

LI Song KANG Yili LI Daqi TANG Long YANG Jian LIU Xuefen

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 中国石油西南油气田公司工程技术研究院，四川广汉　618300 中国石化石油工程技术研究院，北京　100101 陇东学院能源工程学院，甘肃庆阳　745000

State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China Engineering and Technology Research Institute of Southwest Oil & Gas Field Company, CNPC, Guanghan 618300, China Petroleum Engineering Technology Institute, SINOPEC, Beijing 100101, China

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1 mm 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.

10.13639/j.odpt.2015.06.014