摘要
热采技术是渤海油田开采稠油的主要方式,但普遍存在能耗高、规模大等缺点,制约了海上稠油的开采。渤海A油田具有丰富的地热资源,由此提出了一种利用深部地热能辅助开采浅层稠油的方法。系统地介绍了地热能辅助开采浅层稠油的工艺设计,基于渤海A油田实际地质背景,结合传热理论和油气渗流规律建立了地热能辅助开采稠油的数值模拟模型,并通过经济评价验证了该方法的可行性,分析了敏感因素。模拟结果表明:注入水经地热储层的加热,上返至稠油储层时具有80℃以上高温,能够有效加热稠油储层使稠油黏度大幅度降低,累积产油量达3.0×10^(6)m^(3),是常规注海水累积产油量的1倍;生产20 a净现值显示出地热能辅助开采方法具有良好的经济可行性,资金回收期为2 a,净现值高达21.8×10^(8)元。敏感性分析显示,注水温度为50~60℃时具有较好的开采效果,长水平井段地热能利用率较好,稠油采收率较高,注水速度对地热能辅助开采方法具有多重影响。
The thermal recovery technology is the main method for heavy oil reservoirs in Bohai Oilfield,but it is usually ac⁃companied with high-energy consumption and large capital expenses,restricting the exploitation of offshore heavy oil reser⁃voir.With regard to Bohai Oilfield A with abundant geothermal resources,we proposed a deep geothermal energy assisted recovery method for shallow heavy oil reservoirs and systematically introduced its technological design.In light of the actu⁃al geological background of Bohai Oilfield A,a numerical model of geothermal energy assisted recovery for heavy oil reser⁃voirs was built,which was combined with the heat transfer theory and oil-gas flow laws.In addition,the feasibility of this method was verified by economic evaluation,and sensitive factors were analyzed.The simulation results show that the in⁃jected water,heated by the geothermal reservoir,has a temperature above 80℃when it returns to the heavy oil reservoir.The water can effectively heat the heavy oil reservoir to dramatically reduce the viscosity of heavy oil.The cumulative oil production reaches 3.0×10^(6)m^(3),which is twice the cumulative oil production by conventional seawater injection.Moreover,the net present value over 20 years of production is CNY21.8×10^(8),proving the good economic feasibility of geothermal ener⁃gy assisted recovery,and the payback period is 2 years.Sensitivity analysis finds that recovery results are satisfactory at the water injection temperature of 50-60℃;the long horizontal well section reveals a better utilization of geothermal energy and a higher recovery factor of heavy oil;the water injection rate has multiple influences on geothermal energy assisted re⁃covery.
作者
朱旭晨
刘汝敏
王涛
田苗
陈军
王朔
ZHU Xuchen;LIU Rumin;WANG Tao;TIAN Miao;CHEN Jun;WANG Shuo(Production Optimization,China Oilfield Services Limited,Tianjin City,300450,China)
出处
《油气地质与采收率》
CAS
CSCD
北大核心
2021年第6期63-70,共8页
Petroleum Geology and Recovery Efficiency
基金
“十三五”国家科技重大专项“大型油气田及煤层气开发”之子课题“规模化多元热流体热采工程技术示范”(2016ZX05058-003-009)。
关键词
地热能
稠油
可行性
经济评价
净现值
渤海油田
geothermal energy
heavy oil
feasibility
economic evaluation
net present value
Bohai Oilfield
作者简介
朱旭晨(1994-),男,辽宁葫芦岛人,硕士,从事油气田开发工作。E-mail:zhuxch11@cosl.com.cn。
