The special gas wettability phenomenon of reservoir rocks has been recognized by more and more researchers.It has a significant effect on efficient development of unconventional reservoirs.First,based on the preferent...The special gas wettability phenomenon of reservoir rocks has been recognized by more and more researchers.It has a significant effect on efficient development of unconventional reservoirs.First,based on the preferentially gas-covered ability and surface free energy changes,definition and evaluation methods have been established.Second,a method for altering rock wettability and its mechanisms have been studied,surface oriented phenomena of functional groups with low surface energy are the fundamental reason for gas wettability alteration of rock.Third,the effect of gas wettability on the surface energy,electrical properties and dilatability are investigated.Last,the effects of gas wettability on capillary pressure,oil/gas/water distribution and flow are investigated with capillary tubes and etchedglass network models.The gas wettability theory of reservoir rocks has been initially established,which provides theoretical support for the efficient production of unconventional reservoirs and has great significance.展开更多
为了解非离子型气湿反转剂在改变砂岩表面润湿性方面的作用效果,获得气润湿性良好的砂岩地层,提高凝析气藏的生产能力,分别采用接触角法和Owens二液法考察了非离子型表面活性剂处理前后砂岩岩心的气润湿程度和表面自由能,研究了无机盐...为了解非离子型气湿反转剂在改变砂岩表面润湿性方面的作用效果,获得气润湿性良好的砂岩地层,提高凝析气藏的生产能力,分别采用接触角法和Owens二液法考察了非离子型表面活性剂处理前后砂岩岩心的气润湿程度和表面自由能,研究了无机盐、温度和pH值对气润湿性的影响及气润湿反转的有效期。结果表明,质量分数为0.3%的非离子型氟碳表面活性剂(FG24)可将岩心表面的润湿性由液润湿性反转为强气润湿性,水相和油相在岩心表面的接触角由处理前的36.0°和0°分别增至141.3°和108.0°,且岩心的表面自由能由71.0 m N/m急剧降至3.29 m N/m。在pH值为1数10、无机盐溶液质量浓度为100 g/L、温度140℃范围内,油水相在岩心表面的接触角均大于90°;岩心可在60 d内保持强气润湿性。FG24可将岩心表面反转为強气湿性,并具有良好的耐盐性和耐温性。展开更多
基金supported by the Basic Research on Drilling & Completion of Critical Wells for Oil & Gas (Grant No. 51221003)National Science Fund for Petrochemical Industry (Project No. U1262201)+2 种基金"863" National Project (Project No. 2013AA064803)National Science Fund for Distinguished Young Scholars (Project No. 50925414)National Natural Science Foundation (Project No. 51074173)
文摘The special gas wettability phenomenon of reservoir rocks has been recognized by more and more researchers.It has a significant effect on efficient development of unconventional reservoirs.First,based on the preferentially gas-covered ability and surface free energy changes,definition and evaluation methods have been established.Second,a method for altering rock wettability and its mechanisms have been studied,surface oriented phenomena of functional groups with low surface energy are the fundamental reason for gas wettability alteration of rock.Third,the effect of gas wettability on the surface energy,electrical properties and dilatability are investigated.Last,the effects of gas wettability on capillary pressure,oil/gas/water distribution and flow are investigated with capillary tubes and etchedglass network models.The gas wettability theory of reservoir rocks has been initially established,which provides theoretical support for the efficient production of unconventional reservoirs and has great significance.
文摘为了解非离子型气湿反转剂在改变砂岩表面润湿性方面的作用效果,获得气润湿性良好的砂岩地层,提高凝析气藏的生产能力,分别采用接触角法和Owens二液法考察了非离子型表面活性剂处理前后砂岩岩心的气润湿程度和表面自由能,研究了无机盐、温度和pH值对气润湿性的影响及气润湿反转的有效期。结果表明,质量分数为0.3%的非离子型氟碳表面活性剂(FG24)可将岩心表面的润湿性由液润湿性反转为强气润湿性,水相和油相在岩心表面的接触角由处理前的36.0°和0°分别增至141.3°和108.0°,且岩心的表面自由能由71.0 m N/m急剧降至3.29 m N/m。在pH值为1数10、无机盐溶液质量浓度为100 g/L、温度140℃范围内,油水相在岩心表面的接触角均大于90°;岩心可在60 d内保持强气润湿性。FG24可将岩心表面反转为強气湿性,并具有良好的耐盐性和耐温性。
