摘要
为研究水平井压单缝和多缝时裂缝夹角(从0°变化到90°,以15°为递增单元)对开发效果的影响,利用商业软件Eclipse中NWM模块,对比笛卡尔网格加密法,提出了利用Pebi网格加密模拟裂缝的新方法.提出了减小缝间干扰的方法.研究表明:较之笛卡尔网格加密法,Pebi网格加密法更能准确地模拟夹角处于0°～90°之间的情况;易见水的夹角受多种因素的影响,过早见水会严重影响开发效果;夹角越大,缝间干扰越明显;缝间干扰只对初期的采油速度产生影响,对最终的开发效果影响不大;均质地层情况下,中间缝长、两端缝短的裂缝分布有利于减弱对驱替能量的阻挡,推迟见水时间;裂缝均匀分布于两注水井之间可以平衡各缝之间的影响,改善开发效果.
A new method for simulating artificial fractures using Pebi grid refinement is proposed when there is any angle between artificial fracture and horizontal well-bore.The effect of the angle(varying from 0° to 90°,increment is 15°) on the development result of horizontal well is studied under the conditions of single fracture and multiple fractures separately,and the way to decrease the interference among the artificial fractures is suggested under the condition of multiple fractures.The results indicated that,compared with Cartesian grid refinement method,Pebi grid refinement can more accurately simulate the fractures with the angle of 0° ~ 90°;the angle which easily leads to early water breakthrough is influenced by many factors,and early water breakthrough could severely decrease the total oil production;the bigger the angle,the more obvious the effect of interference among fractures on development result;between 15° and 90°,the bigger the angle,the greater the interference among the factures,the lower the initial oil recovery rate and the greater the final oil production except easily water breakthrough angle;under the condition of homogeneous formation,the fracture distribution of short fractures in the two ends and long fractures in the middle of horizontal well could delay the time of water breakthrough;the uniform distribution of fractures along horizontal well between two water injection wells could balance the effect among fractures and improve the development result of horizontal well.
出处
《西安石油大学学报（自然科学版）》
CAS
北大核心
2012年第2期58-62,120,共5页
Journal of Xi’an Shiyou University（Natural Science Edition）
关键词
水平井
人工裂缝方位
开发效果
数值模拟
网格加密
水驱前缘
缝间干扰
horizontal well
artificial fracture azimuth
development result
numerical simulation
grid refinement
water driving front
interference among fractures
