摘要
海上多层聚驱油井压裂渗流方面的研究相对缺乏。针对该问题,运用渗流力学、数学物理学、数值分析等方法,建立多层聚驱油井压裂解堵的试井模型,利用Laplace积分变换和有限余弦傅立叶变换求得压裂井拉氏空间解析解,并通过Stehfest数值反演方法计算井底压力、绘制井底压力双对数曲线。研究表明:海上多层聚驱油藏聚堵井压裂试井双对数曲线呈现7个典型渗流阶段。其中,线性流“双轨”特征是内区压裂裂缝的反映,两条近似水平的拟径向流段,反映内区为聚合物溶液、外区为油水混合物油藏的复合特征,导数曲线后期是多层合采井不同组合边界的特征响应。
At present, there is a lack of research on fracture flow in offshore multilayer polymer flooding wells.Aiming at this problem, with the help of seepage flow mechanics, mathematical physics method, numerical analysis methods, a well test model for fracturing and plugging removal of multi-layer polymer flooding wells is established.Laplace integral transform and finite cosine Fourier transform are used to obtain the analytical solution of the Laplace space of fractured well, and the double logarithm curve of bottom hole pressure is calculated and drawn by Stehfest numerical inversion method.The results show that there are 7 typical seepage stages in the log-log curve of plugging well fracturing test in offshore multilayer polymer flooding reservoirs.Among them, the “double track” characteristic of linear flow is the reflection of fracture in inner zone.Two quasi-radial flow sections, which are approximately horizontal, reflect the composite characteristics of a reservoir with polymer solution in the inner zone and oil-water mixture in the outer zone.The late derivative curve is the characteristic response of different combination boundary of multilayer commingled production well.
作者
瞿朝朝
刘斌
李展峰
张伟
别梦君
QU Zhaozhao;LIU Bin;LI Zhanfeng;ZHANG Wei;BIE Mengjun(Tianjin Branch,CNOOC(China)Ltd.,Tianjin 300452,China)
出处
《重庆科技学院学报（自然科学版）》
CAS
2022年第1期28-34,共7页
Journal of Chongqing University of Science and Technology：Natural Sciences Edition
基金
国家科技重大专项“渤海油田加密调整及提高采收率油藏工程技术示范”(2016ZX05058-001)。
关键词
海上油田
多层油藏
聚合物驱
聚堵井
压裂试井
offshore oilfield
multilayer reservoir
polymer flooding
polymer plugging well
fracturing well test
