长庆油田低渗透油藏开发分类分级标准及应用  

Classification Standard of Development in Low Permeability Reservoirs of Changqing Oilfield and Its application

作　　者：周小英[1] 魏明霞 Zhou Xiaoying;Wei Mingxia(Exploration and Development Research Institute of PetroChina Changqing Oilfield Company,Xi'an Shaanxi 710021)

机构地区：[1]中国石油长庆油田分公司勘探开发研究院,陕西西安710021

出　　处：《中外能源》2021年第7期52-57,共6页Sino-Global Energy

摘　　要：针对国内外现有低渗透油藏开发分类分级方法,阶段划分不够精细,难以满足长庆油田精细油藏管理的需求,而且现有方法没有考虑油藏的属性,对目前油藏开发水平的差异无法实施分类管理等问题。在行业标准和长庆低渗透油藏分类的基础上,研究引入表征储层特征及注水精细管理的指标,并运用动静态相关性和累积频率法确定指标的评价区间,运用灰色关联分析法确定权重值,建立了低渗透油藏分级评价标准。通过采用新的评价体系对全油田278个油藏进行了综合评价,其中Ⅰ类油藏89个,占全油田的32%;Ⅱ类油藏135个,占全油田的48.6%;Ⅲ类油藏54个,占全油田的19.4%。Ⅰ类、Ⅱ类、Ⅲ类油藏综合含水分别为41.1%、57.6%、66.6%。实例应用表明,该分类标准能够有效区分各类超低渗透油藏区块的开发特征,分类结果与实际开发特征相吻合,能够达到精细油藏管理、提高油藏开发水平的目的,目前已经推广到基层进行实践。The existing classification methods of low permeability reservoir development at home and abroad has the issues that insufficient stage division results in being hard to meet the needs of delicacy reservoir management in Changqing Oilfield,and no consideration on the properties of reservoirs results in being difficult to manage according to current various reservoir development levels.Based on the industry standard and the classification of the low permeability reservoir in Changqing,this paper introduces the indicators that characterize reservoir and the fine management of water injection.The dynamic and static correlation and method of cumulative frequency are applied to the determination of the evaluation interval of the indicators,and the method of grey correlation analysis is used to determine the weight value,and then the grading evaluation standard of the low permeability reservoir is established.New evaluation system is applied to 278 oil reser-voirs in the whole oilfield,among which there are 89 ClassⅠreservoirs,accounting for 32%of the whole oilfield,there are 135 ClassⅡreservoirs,accounting for 48.6%of the whole oilfield,and there are 54 ClassⅢreservoirs,accounting for 19.4%of the whole oilfield.The composite water cut of ClassⅠ,ClassⅡand ClassⅢreservoirs is 41.1%,57.6%and 66.6%respectively.The cases shows that this classification standard can effectively distinguish the development characteristics of various ultra-low permeability reservoirs,and the classification results are consistent with the actual development characteristics,which can achieve the purpose of fine reservoir management and improving the reservoir development level.At present,it has been popularized to the basic level for application.

关 键 词：低渗透油藏 分类分级 动静结合 精细管理 

分 类 号：TE348[石油与天然气工程—油气田开发工程]