温度和气体对稠油物性的影响
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摘要
为明确多元热流体增产机理、优化多元流体组成,以便为科学编制多元热流体热采的工程方案提供技术支持,通过室内实验研究了温度和气体对渤海南堡油田稠油物性的影响。结果表明,在56数120℃范围内,含天然气稠油和脱气稠油黏度均随温度升高而迅速降低,温度升高到120℃时的原油降黏率约为92%,继续升高温度对稠油黏度的影响较小。在同等条件下,CO_2比N_2更易溶解到原油中,尤其是在温度较低的条件下。注入N_2对改善稠油黏度的作用较小,只在100℃以下时略有降黏效果,温度超过120℃时稠油黏度增加。温度低于160℃时,注入CO_2可以显著降低稠油黏度。将稠油加热至80℃并注入天然气和CO_2体积比约为2∶1的混合气体至16.86MPa可使稠油黏度降低90%。通过升高温度和注入气体两种途径均可使稠油黏度大幅降低。考虑到注汽设备、热损失和注汽成本等因素,"适度加热,辅以注气"的开采技术可以达到较好的降黏效果,可用于海上稠油开采。图2表3参10
Laboratory experiments were performed to investigate the effects of temperature and inject gas on the physical property of heavy oil from an offshore oilfield,so as to clarify the mechanism of enhanced oil recovery by multi-components thermal fluid,optimize the composition of multi-components fluid,and provide technical support for the proper design of the engineering scheme of multi-components heat recovery. The results showed that in the range of 56℃ to 120℃,the viscosity of natural gas saturated oil and degassed oil decreased rapidly with the increase of temperature. The viscosity of heavy oil decreased by about 92% when it was heated to 120℃,while further raising the temperature had little effect on the viscosity. Under the same condition,CO_2 dissolved into crude oil more easily than N_2,especially at low temperature condition. Injection of N_2 had little effect on the viscosity improvement of heavy oil. The viscosity could be reduced slightly with the injection of N_2 when the temperature was below 100℃,and that increased with the injection of N_2 when the temperature was over 120℃. When the temperature was below 160℃,the viscosity reduced obviously with the injection of CO_2. The viscosity of heavy oil could be reduced by 90% at 80℃ with the injection of gas mixture including natural gas and CO_2 in volume ratio of 2∶1 to the pressure of 16.86 MPa. The viscosity of heavy oil could be greatly reduced by raising temperature or injecting CO_2. Taking into account the steam injection equipment,heat loss and the cost of steam injection etc.,the viscosity reduction effect could be achieved by the technology of"moderate heating,auxiliary gas injection",which could be applied to the production of offshore heavy oil.
Laboratory experiments were performed to investigate the effects of temperature and inject gas on the physical property of heavy oil from an offshore oilfield,so as to clarify the mechanism of enhanced oil recovery by multi-components thermal fluid,optimize the composition of multi-components fluid,and provide technical support for the proper design of the engineering scheme of multi-components heat recovery. The results showed that in the range of 56℃ to 120℃,the viscosity of natural gas saturated oil and degassed oil decreased rapidly with the increase of temperature. The viscosity of heavy oil decreased by about 92% when it was heated to 120℃,while further raising the temperature had little effect on the viscosity. Under the same condition,CO_2 dissolved into crude oil more easily than N_2,especially at low temperature condition. Injection of N_2 had little effect on the viscosity improvement of heavy oil. The viscosity could be reduced slightly with the injection of N_2 when the temperature was below 100℃,and that increased with the injection of N_2 when the temperature was over 120℃. When the temperature was below 160℃,the viscosity reduced obviously with the injection of CO_2. The viscosity of heavy oil could be reduced by 90% at 80℃ with the injection of gas mixture including natural gas and CO_2 in volume ratio of 2∶1 to the pressure of 16.86 MPa. The viscosity of heavy oil could be greatly reduced by raising temperature or injecting CO_2. Taking into account the steam injection equipment,heat loss and the cost of steam injection etc.,the viscosity reduction effect could be achieved by the technology of"moderate heating,auxiliary gas injection",which could be applied to the production of offshore heavy oil.
引文
[1]刘小鸿,张风义,黄凯,等.南堡35-2海上稠油油田热采初探[J].油气藏评价与开发,2011,1(2):61-63.
[2] SUN Yongtao,ZHAO Lichang,LIN Tao,et al. Enhance offshore heavy oil recovery by cyclic steam-gas-chemical co-stimulation[C].//SPE Heavy Oil Conference and Exhibition. Kuwait,2011.
[3]顾启林,孙永涛,郭娟丽,等.多元热流体吞吐技术在海上稠油油藏开发中的应用[J].石油化工应用,2012,31(9):8-10.
[4]方国印,马增华,顾启林.多元热流体技术在特稠油探井测试中的应用研究[J].石油化工应用,2018,37(5):11-13.
[5]姜杰,李敬松,祁成祥,等.海上稠油多元热流体吞吐开采技术研究[J].油气藏评价与开发,2012,2(4):38-40.
[6] LIU Yiguang,YANG Hailin,ZHAO Lichang,et al. Improve offshore heavy oil recovery by compound stimulation technology involved thermal,gas and chemical methods[C].//Offshore Technology Conference. Houston,Texas,USA,3-6 May,2010.
[7]唐晓旭,马跃,孙永涛.海上稠油多元热流体吞吐工艺研究及现场试验[J].中国海上油气,2011,23(3):185-188.
[8]张伟,孙永涛,林涛,等.海上稠油多元热流体吞吐增产机理室内实验研究[J].石油化工应用,2013,32(1):34-36.
[9]汪成,孙永涛,王少华,等.温敏凝胶封窜辅助多元热流体吞吐研究与应用[J].油田化学,2018,35(1):109-113.
[10]冯祥,李敬松,杨兵,等.海上稠油多元热流体吞吐各组分增产优化设计研究[J].重庆科技学院学报(自然科学版),2018,20(4):28-31.
[2] SUN Yongtao,ZHAO Lichang,LIN Tao,et al. Enhance offshore heavy oil recovery by cyclic steam-gas-chemical co-stimulation[C].//SPE Heavy Oil Conference and Exhibition. Kuwait,2011.
[3]顾启林,孙永涛,郭娟丽,等.多元热流体吞吐技术在海上稠油油藏开发中的应用[J].石油化工应用,2012,31(9):8-10.
[4]方国印,马增华,顾启林.多元热流体技术在特稠油探井测试中的应用研究[J].石油化工应用,2018,37(5):11-13.
[5]姜杰,李敬松,祁成祥,等.海上稠油多元热流体吞吐开采技术研究[J].油气藏评价与开发,2012,2(4):38-40.
[6] LIU Yiguang,YANG Hailin,ZHAO Lichang,et al. Improve offshore heavy oil recovery by compound stimulation technology involved thermal,gas and chemical methods[C].//Offshore Technology Conference. Houston,Texas,USA,3-6 May,2010.
[7]唐晓旭,马跃,孙永涛.海上稠油多元热流体吞吐工艺研究及现场试验[J].中国海上油气,2011,23(3):185-188.
[8]张伟,孙永涛,林涛,等.海上稠油多元热流体吞吐增产机理室内实验研究[J].石油化工应用,2013,32(1):34-36.
[9]汪成,孙永涛,王少华,等.温敏凝胶封窜辅助多元热流体吞吐研究与应用[J].油田化学,2018,35(1):109-113.
[10]冯祥,李敬松,杨兵,等.海上稠油多元热流体吞吐各组分增产优化设计研究[J].重庆科技学院学报(自然科学版),2018,20(4):28-31.