超稠油油藏蒸汽辅助重力泄油后期注空气开采技术  

Air-SAGD technology for super-heavy oil reservoirs

作　　者：高永荣[1] 郭二鹏[1] 沈德煌[1] 王伯军[1] GAO Yongrong;GUO Erpeng;SHEN Dehuang;WANG Bojun(Research Institute of Petroleum Exploration & Development,PetroChina,Beijing 100083,China)

机构地区：[1]中国石油勘探开发研究院,北京100083

出　　处：《石油勘探与开发》2019年第1期109-115,共7页Petroleum Exploration and Development

基　　金：国家油气重大专项"改善SAGD开发效果技术研究与应用"(2016ZX05012-002)

摘　　要：利用室内实验方法研究注空气低温氧化对超稠油黏度、组分的影响程度以及低温氧化前后驱油效率的变化特点,以此为基础,利用数值模拟方法探讨蒸汽辅助重力泄油(SAGD)后期注空气开发的可行性、实施方式与实施效果。实验研究表明,对于辽河油田杜84块兴Ⅵ组直井水平井组合SAGD试验区,汽腔温度150～250℃,注空气发生低温氧化,低温氧化后原油黏度大幅升高,驱油效率急剧下降。模拟了SAGD后期3种开发方式,即蒸汽+空气低温氧化、单纯空气低温氧化和单纯空气高温燃烧,通过对比生产动态曲线、剩余油分布等发现,在SAGD后期采用注空气高温燃烧方法能够有效避免蒸汽热损失,最大程度采出剩余油,延长油藏开发时间。The air oxidation of super-heavy oil at low temperature was studied in laboratory and its influences on oil viscosity,component and steam sweep efficiency before and after air-injection were analyzed.The feasibility,operation mode and air flooding effect at the late stage of steam assisted gravity drainage(SAGD)were investigated by numerical simulation.The experimental results show for vertical-horizontal well pair SAGD test area of Xing VI Formation in Block Du 84 of Liaohe Oilfield,the low temperature oxidation occurred between 150-250℃(steam chamber temperature),the oil viscosity increased greatly after low temperature oxidation,consequently,the oil displacement efficiency dropped sharply.Three development methods in the late stage of SAGD were simulated,i.e.,steam+air low temperature oxidation,only air low temperature oxidation and only air high temperature oxidation.By comparing production dynamic curves and residual oil distribution etc.,high temperature oxidation reduced the heat loss in late stage of SAGD,recovered the residual oil effectively,and prolonged reservoir development time.

关 键 词：超稠油 蒸汽辅助重力泄油 注空气 低温氧化 高温燃烧 

分 类 号：TE345[石油与天然气工程—油气田开发工程]