溶洞单元水驱油机理实验研究  

The Mechanism about Oil Displacement by Water in Cavernous Reservoir

作　　者：吕爱民[1] 李刚柱 谢昊君[1] 王月英[1] 马汉卿 

机构地区：[1]中国石油大学(华东)石油工程学院,青岛266580

出　　处：《科学技术与工程》2015年第10期92-96,共5页Science Technology and Engineering

基　　金：国家973项目(2011CB202404);国家科技重大专项(2008ZX05014-003-006HZ);国家自然科学基金(51274226;2013-2016)资助

摘　　要：为了研究溶洞介质中水驱油规律,结合油田现场资料,根据相似理论确定物理模拟模型及实验条件,制作了单一溶洞充填模型;并提出了无因次重力数的概念,对该模型进行水驱油实验。研究了不同充填程度、注采位置、不同充填类型,模型的油水替换效率及水驱后的剩余油分布情况。研究发现:低注高采时,油水的重力分异作用明显,油水的替换效率高,因此剩余油饱和度较低,采收率较高;高注高采时,通过无因次重力数的大小来判断重力与黏滞力对油水替换效率的贡献程度,得到无因次重力数为0.18,注水速度在40 m L/min附近时,油水替换效率较高,注水开发效果最佳。对溶洞型碳酸盐岩油藏进一步提高采收率具有重要的指导意义。In order to study the law of oil displacement by water in vuggy rock,have been produced a single cave filling model,and put forward the concept of dimensionless gravity number on the basis of site materials of oil-fields,and determined the physical conditions and simulation models on the basis of analogy theory.By carrying out experiments of oil displacement by water,different filling degrees,injection locations,types of filling,replacement efficiency and oil distribution after oil being displaced by water are observed.The investigation reveals that.under the condition of low injection high mining,the gravity differentiation between oil and water is obvious,and replacement efficiency is high,so the saturation degree of remaining oil is low,and recovery rate is high ; while under the condition of high injection and high mining,concluded the role of gravity and viscous forces in replacement coefficient by analyzing the dimensionless gravity number obtained in the experiment.When dimensionless gravity number around 0.18 and water injection rate around 40 mL/min,the replacement coefficient is high,indicating that the water flooding development effect is good.This has important guiding significance for enhancing recovery in carvernous carbonate reservoir.

关 键 词：溶洞介质 水驱油实验 无因次重力数 替换效率 

分 类 号：TE357.6[石油与天然气工程—油气田开发工程]