新疆油田强水敏砾岩油藏二氧化碳驱连通特征  

CO_(2) Flooding Connectivity Characteristics of the Strong Water-Sensitive Conglomerate Reservoir in Xinjiang Oilfield

作　　者：陈神根 徐金山 张鑫 王瑞 张莉伟 李海福 CHEN Shengen;XU Jinshan;ZHANG Xin;WANG Rui;ZHANG Liwei;LI Haifu(Research Institute of Engineering Technology,PetroChina Xinjiang Oilfield Company,Karamay 834000,Xinjiang,China)

机构地区：[1]中国石油新疆油田分公司工程技术研究院(监理公司),新疆克拉玛依834000

出　　处：《新疆石油天然气》2024年第1期44-51,共8页Xinjiang Oil & Gas

基　　金：中国石油天然气集团公司科研项目“CCUS注采工艺、产出气循环利用及高效防腐关键技术研究”(2021ZZ-01-04)。

摘　　要：明确CO_(2)驱油藏注采井间连通特征可为后续针对性实施CO_(2)驱波及效率改善技术提供基础支撑。以新疆油田某强水敏砾岩油藏为研究对象,通过现场注采相关数据分析,明确注采连通性判断关键参数,预设关键参数比重后设计评价系数C,确定C值不同取值范围下注采井间连通关系,建立一套强水敏砾岩油藏连通性评判方法。通过该方法可判断该区注采井间弱连通、中等连通、强连通情况,分析不同连通特征主控因素,形成针对性治理对策。研究表明,注采连通性判断关键参数为生产井产油量、油压、气体组分;C值大于8时注采井属于强连通关系,C值在3~8时注采井属于中等连通关系,C值小于3时注采井属于弱连通关系。统计全区注采数据,根据C值判断,区块注采井间连通性呈两种明显连通特征,一是注采连通具有方向性,中强连通主要偏西北方向,但局部连通具有一定差异性,分析主要受构造及前期水驱影响;其次是注采连通具有区域性,区块中心偏东北注采连通性较好,该区22口井中强连通井14口,占比达63.6%,主要受地层渗透性差异及注碳量影响。根据注采连通性判断结果,建议对该区各类连通井分类治理,边缘区弱连通井吞吐补能,核心区弱连通井小规模压裂,强连通井封窜调剖。本研究可对提升强水敏砾岩油藏注水后CO_(2)驱高效开发提供参考和借鉴。Clarifying the connectivity characteristics between injection and production wells in CO_(2) flooding reservoirs can provide es-sential support for the subsequent implementation of CO_(2) flooding technology to improve sweep efficiency.With a strong water-sensi-tive conglomerate reservoir in Xinjiang Oilfield as the research object,this paper specifies the key parameters for determination of in-jection and production connectivity through the analysis of injection and production data.It designs the evaluation coefficient Cafter presetting the proportion of key parameters,and confirms the connectivity between injection and production wells under different rang-es of Cvalue,thus establishing a connectivity evaluation method for the strong water-sensitive conglomerate reservoir.This method can be used to judge weak,medium,or strong connectivity between injection and production wells in this area and analyze the main control-ling factors of different connectivity characteristics to form targeted treatment measures.The study shows that the key parameters for determination of injection and production connectivity are oil production rate,tubing pressure,and the gas component of production wells.When the Cvalue is greater than 8,the injection and production wells have strong connectivity;between 3 and 8,the injection and production wells have medium connectivity;and when less than 3,the injection and production wells have weak connectivity.Ac-cording to the statistical injection and production data of the whole area and the Cvalue,the connectivity between injection and produc-tion wells in the block presents two apparent characteristics.First,the connectivity between injection and production wells has direc-tionality.The medium and strong connectivity is mainly northwest,but the local connectivity has specific differences,primarily affected by the structure and early water flooding.Second,the connectivity has regional characteristics and is better in the northeast region of the block center.Among the 22 wells in the area,

关 键 词：强水敏砾岩油藏 CO_(2)驱 注采井 连通性 主控因素 准噶尔盆地 

分 类 号：TE357[石油与天然气工程—油气田开发工程]