大庆石油地质与开发2025，Vol.44Issue(2)：89-98,10.DOI:10.19597/J.ISSN.1000-3754.202310016
海上多层合采油藏酸化解堵影响下的水驱差异化动用机理
Differential producing mechanism of waterflooding in offshore multi-layered commingled production reservoirs influenced by acidizing plug removal
摘要
Abstract
In order to study differential producing mechanism of waterflooding in offshore multi-layered commingled production reservoirs influenced by acidizing plug removal,cores are selected from X oilfield in Bohai Bay Basin as research object in static compatibility experiment,thin section analysis of cast bodies,and core-parallel acidizing waterflooding experiment based on nuclear magnetic resonance technique,determining scaling types of reservoirs,scale crystal formation mechanism and plug removal effect of hydrochloric acid of X oilfield,so as to reveal the in-fluence of acidizing on displacement efficiency,injection pressure,oil occurrence characteristics and producing laws of cores with different properties during the process of multi-layered commingled waterflooding.The results show that the key factor causing reservoir damage is CaCO3 scale formed by poor compatibility between injection wa-ter and formation water,distributing granularly and reducing reservoir properties in pore throats.Acidizing plug re-moval can improve reservoir properties,with displacement efficiency of relatively high-permeability cores in-creased by 3.45 percentage points of that before acidizing,while displacement efficiency of relatively low-permea-bility cores decreased by 23.56 percentage points of that before acidizing.The reaction of acid with CaCO3 scale generates gas,causing Jamin effect in pore throat flow,which not only prevents the migration of some oil droplets but also"locks"the formed water flooding channels,resulting in increase of waterflooding pressure and secondary plugging in low-permeability cores,and significant increase of remaining oil in small pore throats.The research pro-vides theoretical guidance for waterflooding development of offshore multi-layered commingled production reser-voirs after acidizing.关键词
酸化解堵/差异化动用/储层结垢/多层合采/核磁共振Key words
acidizing plug removal/differential producing/reservoir scaling/multi-layered commingled produc-tion/nuclear magnetic resonance分类
石油、天然气工程引用本文复制引用
田冷,王嘉新,康凯,张雷,王锐,张博..海上多层合采油藏酸化解堵影响下的水驱差异化动用机理[J].大庆石油地质与开发,2025,44(2):89-98,10.基金项目
国家自然科学基金项目"基于超声波作用促进低渗透油藏CO2驱动态混相机理研究"(51974329). （51974329）
