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杜建芬,赵勇,郭平,等. 鄂北致密气藏注CO2驱替提高采收率实验研究[J]. 科学技术与工程, 2020, 20(16): 6459-6465.
dujianfen,郭平,et al.Experimental Research On Recovery Efficiency Improvement By CO2 Injection In Tight Gas Reservoirs In E Bei[J].Science Technology and Engineering,2020,20(16):6459-6465.
鄂北致密气藏注CO2驱替提高采收率实验研究
Experimental Research On Recovery Efficiency Improvement By CO2 Injection In Tight Gas Reservoirs In E Bei
投稿时间:2019-07-02  修订日期:2020-02-27
DOI:
中文关键词:  关键词:枯竭气藏  CO2埋存  长岩心实验  提高气藏采收率  
英文关键词:Key words: diffusion coefficient  CO2 embedding  Long Core Experiment  Improving gas reservoir recovery  
基金项目:(国家科技重大专项示范任务2016ZX05048003,(《鄂尔多斯盆地致密低渗油气藏注气提高采收率技术》)
           
作者单位
杜建芬 西南石油大学
赵勇 西南石油大学
郭平 西南石油大学
赵清民 中国石油化工股份有限公司石油勘探开发研究院
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中文摘要:
      摘要:在低渗透致密气藏注提高气藏采收率是目前世界研究的热点。为了揭示气藏中CO2埋存与提高气藏采收率之间的关系和影响因素,开展了高温高压条件下CO2驱替CH4的长岩心实验。通过85℃下长岩心驱替实验研究了注入时机、注入速度、储层渗透率和地层倾角存在对CH4采收率、CO2突破时间及埋存的影响.实验结果表明:对气藏而言应早期采用衰竭开发到废弃压力再注气为最佳开发方式。,CO2驱替CH4过程采收率在80.37%——94.83%,CO2突破时间在0.6PV——0.7PV,CO2突破时CH4采收率在69.37%——91.87%。驱替速度越小,CO2突破越快,最终CH4采收率越小;高注低采45°比高注低采5°CO2突破要早0.1PV左右,采收率低约1.02%;渗透率越低时,相同注入PV时CO2的驱气效率更低,最终CH4采收率越低。研究结果说明,气藏中注CO2可提高气藏采收率及实施CO2埋存,CO2超临界性质、重力作用、低速下扩散以及CO2在地层水中溶解不容忽视。
英文摘要:
      Abstract: Greenhouse gas CO2 buried in exhausted gas reservoirs and enhanced gas reservoir recovery rate are currently the world's research hotspots. In order to reveal the relationship and influencing factors between CO2 storage and enhanced gas reservoir recovery, long core experiments of CO2 displacement of CH4 under high temperature and high pressure were carried out. The effects of injection timing, injection rate, reservoir permeability and formation dip on CH4 recovery, CO2 breakthrough time and burial were studied by long core displacement experiment at 85 ℃. The experimental results show that the lower the depletion pressure is, the higher the cumulative recovery is. The recovery of CO2 displacement CH4 is 80.37%-94.83%, the breakthrough time of CO2 is 0.6PV-0.7PV, and the recovery of CH4 is 69.37%-91.87% when CO2 breaks through. The smaller the displacement speed is, the faster the CO2 breakthrough is, the smaller the final CH4 recovery rate is; the 45 degree of high injection and low recovery is about 0.1 PV earlier than the 5 degree CO2 breakthrough of high injection and low recovery, and the recovery rate is about 1.02%. The lower the permeability is, the lower the displacement efficiency of CO2 is at the same injection of PV, and the lower the final CH4 recovery rate is. The results show that CO2 injection into gas reservoirs can improve gas reservoir recovery and implement CO2 storage. The supercritical nature of CO2, gravity, low-speed diffusion and CO2 dissolution in formation water can not be ignored.
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