冀东浅层稠油油藏CO2/N2复合气体吞吐提高采收率的可行性
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国家重大专项“低渗-致密油藏高效提高采收率新技术”(项目编号2017ZX05009-004)


Feasibilty of Gas-EOR Using CO2/N2 Mixture for a Shallow-buried Heavy Oil Reservoir in Jidong Oilfield
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    摘要:

    冀东浅层稠油油藏开展CO2吞吐取得了较好的增油效果,但长期注CO2导致的井筒腐蚀等生产问题日益凸显;N2是优良的增能介质,且来源广、性能稳定,将二者结合形成复合气体,是冀东油田CO2吞吐后的储备技术之一。为对比不同注气介质的增油效果,分别设计了5种摩尔比例的CO2/N2复合气体(1∶0(纯CO2)、4∶1、7∶3、1∶1 和0∶1(纯N2)),并开展了相应的注气膨胀实验和注气吞吐物理模拟实验。注气膨胀实验结果表明,CO2与稠油的作用能力要明显好于N2;复合气体与原油的作用能力介于纯CO2与纯N2之间,且随着复合气中CO2比例的增加,其溶解降黏和溶解膨胀的效应越明显;当注气量超过20 mol%、摩尔比例超过7∶3时,复合气体对稠油的降黏率可达40%以上。注气吞吐实验结果表明,体积比2∶1(摩尔比4∶1)的复合气体经过4轮吞吐后可提高采收率17.03%,接近纯CO2的增油效果;该比例的复合气体可实现CO2溶解降黏和N2增能的协同效应,有效提高稠油油藏采收率。

    Abstract:

    Although a remarkable oil increment has been obtained using CO2 huff-n-puff process in a shallow-buried heavy oil reservoir of Jidong oilfield,production problems especially wellbore corrosions also occur due to the long-term CO2 injection. N2 is a kind of gas with wide sources and stable properties,which can be used for energy supplement. Based on the respective properties of CO2 and N2,their mixture is then proposed as an alternative technique for enhanced oil recovery(EOR)after CO2 huff-n-puff process. In order to compare different EOR effect using different injecting gas media,CO2/N2 mixtures with five different CO2/N2 molar ratios(1∶0(pure CO2),4∶1,7∶3,1∶1 and 0∶1(pure N2))were designed in this paper,and PVT analysis and gas huff-n-puff experiments were conducted in the laboratory. PVT analysis results revealed that CO2 had a better interactions with the heavy oil compared with N2. The interactions of CO2/N2 mixture and formation oil were between CO2-oil interactions and N2-oil interactions,and the abilities of solubility,oil swelling and viscosity reduction for the mixture increased as the CO2 concentration increased.When the injection gas excessed 20 mol% and CO2/N2 molar ratio was higher than 7∶3,the viscosity reduction rate was higher up to 40%. Gas huff-n-puff experimental results showed that about 17.03% of oil recovery could be obtained after 4 cycles of 2∶1(CO2/N2 molar ratio is 4∶1)mixture injection,which was nearly the oil recovery obtained by pure CO2 injection. With such a design of CO2/ N2 ratio for the mixture,a synergetic effect could be achieved with viscosity reduction dominated by CO2 solubility coupled with energy supplement by N2 injection,which could then effectively enhance the heavy oil recovery

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郝宏达,侯吉瑞,黄捍东,赵凤兰,刘怀珠.冀东浅层稠油油藏CO2/N2复合气体吞吐提高采收率的可行性[J].油田化学,2020,37(1):80-85.
HAO Hongda, HOU Jirui, HUANG Handong, ZHAO Fenglan, LIU Huaizhu. Feasibilty of Gas-EOR Using CO2/N2 Mixture for a Shallow-buried Heavy Oil Reservoir in Jidong Oilfield[J]. OILFIELD CHEMISTRY,2020,37(1):80-85.

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  • 在线发布日期: 2020-04-27
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