水驱开发多层油藏井间连通性反演模型.pdf

石油勘探与开发
2016年2月
PETROLEUM EXPLORATION AND DEVELOPMENT
Vol43 No. 1 99
文章编号:100047(2016)01-0099-08DOI:10.11698/PED.2016.01.12
水驱开发多层油藏井间连通性反演模型
赵辉',康志江2,孙海涛,张贤松3,李颖
(1.长江大学石油工程学院:;2.中国石油化工般份有限公司石油勘探开发研究院;3.海洋石油高效开发国家重点实验室)
基金项目:国家科技重大专项(2011ZX05014);国家自然科学基金资助项目(51344003)
摘要:针对当前井闯连通性模型只能预測产液动态变化、无法计算油水两相动态且不能分层进行连通性分析等局限性,
建立了新的可模拟油水动态的多层油藏井间连通性模型。模型将油藏系统分层离散成一系列由井间传导率和连通体积等参
数表征的井间连通单元,并以连通单元为模拟对象进行物质平衡方程计算,通过考虑定液、定压两种生产模式实现压力求
解和井间流量计算,结合前缘推进理论建立了井间饱和度迫踪计算方法,最终得出井点处各层的油水产出动态;以此为基
础利用随机扰动近似法和投影梯度法等通过动态拟合建立了模型参数反演方法。实例应用显示,所建模型取得了较好的动
态拟合和预测效果,反演后的连通模型参数与实际油藏地质特征相吻合,验证了方法的正确性;相比当前连通性方法,模
型能实时获得分层井间流量分配系数、单井产液和产油劈分系数等信息,可以更准确地反映油藏平面及纵向的油水流动关
系和生产措施变化,指导油田实际生产。图8参28
关键词:多层油藏;井间连通性;反演模型;井间连通单元;井间流量分配系数;油井产量劈分系数
中图分类号:TE319
文献标识码:A
An interwell connectivity inversion model for waterflooded multilayer reservoirs
ZHAO Hui, KANG Zhijiang SUN Haitao,, ZHANG Xiansong, LI Ying
(1. College of Petroleum Engineering, Yangtze University, in zhou 434023, China; 2. Sinopec Exploration& Production Research
Institute, Beijing 100728, China; 3. State Key Laboratory of Offshore Oil Exploitation, Beijing 100727, China)
Abstract: In view of the limi ations that the curent connectivity model an only forecast the fluid production dynamic change, can
calculate the dynamics of oil and water phases, and cant analyze the connectivity between wells layer by layer, this study establishes a
new interwell connectivity mode for multiayer reservoirs which can simulate dynamics of l and water between wells. The model
hierarchically separates the reservoir system into a series of interwell connecting units characterized by parameters such as conductivit
and control olume, and b using the material balance equation, the pressure and interwell flow at constant liquid production and constant
pressure is calculated with the connecting unit as simulation object, which are combined with the frontal advance theory to establish
interwell saturation tracking calculation me, and finally water production dynamics of every layer at well points can be worked out
On this basis, using simultaneous perturbation stochastic approximation method and gradient projection method, a model parameter
inversion method is set up by dynamic fitting. The application cases show that the model has good dynamic fitting and prediction effect
inversed model parameters and the actual geological parameters coincide with well, verifing the validity of the method. Compared with
the current connectivity method, it can obtain the real-time model of hierarchical interwell ow rate distribution coefficient, liquid
production of single well and oil plit coeffient and other n ormation and elect the esir hozontal and vertical oil-water ow
relation more accurately, providing uidance for production measure adjustment in oilfield
Key words: multilayer reservoir; interwell conectivity; inversion model, interwell connecting unit; interwell flow rate distribution
coefficient; oil split coefficient
0引言
体认识的需要
利用油田注采数据研究井间连通性是另一类非常
油层井间连通性评价是油藏注水开发设计的基重要的方法,其具有操作简单、计算快速、反演范围
础,对于优化注采结构关系、分析剩余油分布规律和大等特点,其反演模型主要包括相关分析模型?、多元
制定加密调剖等措施方案具有重要的指导作用]。实回归模型?、电容模型]和系统分析模型?等。前两
际矿场一般通过示踪剂测试、井间微地震、干扰试井种模型通过拟合实际产液数据获取注采动态的相关系
等方法来认识井间连通性],但其存在影响实际生产、数来表征井间连通状况。后两种模型实质是对多元回
解释周期长、费用高等缺点,无法满足区块和油田整归模型中的注入速度进行