摘要
海拉尔油田高倾角油藏石油探明地质储量规模大,地层倾角超过10°以上的储量占总探明地质储量的68.6%。受构造高差的影响,常规注水开发难以实现构造顶底部位油井均衡驱替,边底部油井含水率上升快,构造高部位油井受效差,整体开发效果不理想。针对海拉尔油田高倾角断块油藏水驱开发效果差的问题,以注CO_(2)重力驱油实验为基础,以油藏数值模拟为手段,开展注CO_(2)重力驱油机理、影响因素及适用性研究。结果表明:当以原始地层压力10.57 MPa注入1.2 PV的CO_(2)时,CO_(2)驱油效率可达55.9%,能大幅度提高高倾角断块油藏的采收率;地层倾角、储层渗透率、注气速度是影响注CO_(2)重力驱效果的主要因素;海拉尔油田有4411.35×10^(4) t石油探明地质储量适合开展注CO_(2)重力驱开发,注CO_(2)重力驱技术在海拉尔油田具有广阔的应用前景。
High-dip reservoirs in Hailar Oilfield have large amount of proved OOIP,and reserves with stratigraphic dip of>10°account for 68.6% of the total proved OOIP.Affected by structural relief,conventional water flooding development cannot realize balanced displacement of wells in top and bottom of structure.Water cut in producers at the edge and bottom increases rapidly,while producers in structural high get less response,with ineffective overall development.Aiming at the problem of poor water flooding development effect of high-dip fault block reservoir in Hailar Oilfield,based on laboratory oil displacement experiment of CO_(2) gravity drainage and using reservoir numerical simulation method,the mechanism,influencing factors and applicability of CO_(2) gravity drainage are studied.The results show that CO_(2) displacement efficiency reaches 55.9% with 1.2 PV CO_(2) injected at initial formation pressure of 10.57 MPa,greatly improving the recovery of high-dip fault block reservoir.Stratigraphic dip,reservoir permeability and gas injection rate are the main factors affecting the effect of CO_(2) gravity drainage.Hailar Oilfield has 4411.35×104 t of proved OOIP suitable for gravity drainage development.CO_(2) gravity drainage technology has broad application prospects in Hailar Oilfield.
作者
孔凡顺
李延军
郭天娇
刘建栋
南金浩
KONG Fanshun;LI Yanjun;GUO Tianjiao;LIU Jiandong;NAN Jinhao(R&D Center of Sustainable Development of Continental Sandstone Mature Oilfield,Daqing 163712,China;Exploration and Development Research Institute of PetroChina Daqing Oilfield Co Ltd,Daqing 163712,China)
出处
《大庆石油地质与开发》
CAS
北大核心
2023年第6期75-81,共7页
Petroleum Geology & Oilfield Development in Daqing
基金
中国石油天然气股份有限公司重大科技专项“松辽盆地(大庆、吉林)CCUS技术集成与工业化试验”(2021ZZ01-08)。
关键词
注CO_(2)重力驱
数值模拟
驱油效率
高倾角断块油藏
CO_(2)gravity drainage
numerical simulation
oil displacement efficiency
high-dipfault block reservoir
