摘要
中国水驱老油田已进入高含水甚至特高含水开采期,平面矛盾和层间矛盾加剧,剩余油分布高度分散,经济有效开采难度越来越大。为满足油田快速、准确识别优势渗流通道和治理低效无效循环的需要,基于油藏数值模拟和水驱规律曲线方法,提出了一种快速预测单井分层动态指标的方法。对大庆油田筛选出的10条天然岩心相对渗透率曲线进行了研究,发现采出程度与水油比在半对数坐标系中有很好的线性关系,相关系数均在0.99以上。以此为基础进一步回归出了这一线性关系表达式中斜率和截距与渗透率的关系,从而得到了不同渗透率下采出程度与含水率(或水相分流量)之间的关系式。对单井产液量进行劈分,与得到的关系式结合,建立了一种新的油井分层动态指标预测模型,并提出了采用实际生产动态数据对产量的修正方法。与Eclipse数值模拟软件计算进行了对比,两者水驱采收率计算结果最大误差为2.72%.对实际生产区块动态指标计算结果表明,方法简便易掌握,能够高效、准确地对水驱油藏分层动态指标进行预测,解决了常用预测方法耗时长、计算复杂、受人为因素影响大等问题。
As the matured waterflooding oilfields in China are mostly at high/uhra-high water cut stages, and plane and interlayer conflicts become more serious, remaining oil distribution is highly dispersed and economic and efficient production becomes more and more difficult. In order to meet the requirements to identify preferential flow paths quickly and accurately and to control the ineffective and low effective circulation for oilfields, this paper puts forward a new method to fast forecast layered production indexes for individual wells based on the conventional numerical simulation technology and the method of water flooding curves. In this paper, 10 relative permeability curves of natural cores selected by Daqing oilfield are studied, it is found that the recovery percent of reserves and water-oil ratio exhibit a good linear relation in semilog coordinate system with the correlation coefficient greater than 0.99. Based on this, the functional relationship among the slope and intercept of the expression and permeability is calculated by using parameter regression, and then the relationship between recovery percent of reserves and water cut （or water fractional flow） under various permeability is obtained. Combining single well production split with the above formula, the paper establishes a new forecasting model of layered production indexes for individual wells, and simultaneously proposes a production correction method using actual production data. Compared with the calculation results obtained from Eclipse numerical simulation software, the maximum error between the waterflooding recovery factors obtained from the 2 methods is 2.72%. The calculation results of the dynamic index of the actual production block shows that the method is simple and easy to learn, which can forecast the layered production indexes of water flooding reservoirs efficiently and accurately, and can solve the problems such as timeconsuming, complex computation and human intervention in previous forecast methods.
出处
《新疆石油地质》
CAS
CSCD
北大核心
2017年第2期233-239,共7页
Xinjiang Petroleum Geology
基金
国家科技重大专项(2016ZX05010003-003)
国家自然科学基金(51574085)
关键词
水驱油田
多产层油藏
分层动态指标
水驱特征曲线
预测方法
参数回归
waterflooding oilfield
multiple-pay reservoir
layered production index
waterflooding type curve
forecasting method
parameter regression
