Water injection for oil displacement is one of the most effective ways to develop fractured-vuggy carbonate reservoirs.With the increase in the number of rounds of water injection,the development effect gradually fail...Water injection for oil displacement is one of the most effective ways to develop fractured-vuggy carbonate reservoirs.With the increase in the number of rounds of water injection,the development effect gradually fails.The emergence of high-pressure capacity expansion and water injection technology allows increased production from old wells.Although high-pressure capacity expansion and water injection technology has been implemented in practice for nearly 10 years in fractured-vuggy reservoirs,its mechanism remains unclear,and the water injection curve is not apparent.In the past,evaluating its effect could only be done by measuring the injection-production volume.In this study,we analyze the mechanism of high-pressure capacity expansion and water injection.We propose a fluid exchange index for high-pressure capacity expansion and water injection and establish a discrete model suitable for high-pressure capacity expansion and water injection curves in fractured-vuggy reservoirs.We propose the following mechanisms:replenishing energy,increasing energy,replacing energy,and releasing energy.The above mechanisms can be identified by the high-pressure capacity expansion and water injection curve of the well HA6X in the Halahatang Oilfield in the Tarim Basin.By solving the basic model,the relative errors of Reservoirs I and II are found to be 1.9%and 1.5%,respectively,and the application of field examples demonstrates that our proposed high-pressure capacity expansion and water injection indicator curve is reasonable and reliable.This research can provide theoretical support for high-pressure capacity expansion and water injection technology in fracture-vuggy carbonate reservoirs.展开更多
目的比较腹腔镜下T管缝合时预置缝线法与传统缝合方法的效果差异。方法回顾性分析2020年6月至2023年9月间空军特色医学中心行腹腔镜T管缝合的患者的临床资料,对照组采用传统的T管缝合方法,研究组采用预置缝线的T管缝合方法:间断缝合,进...目的比较腹腔镜下T管缝合时预置缝线法与传统缝合方法的效果差异。方法回顾性分析2020年6月至2023年9月间空军特色医学中心行腹腔镜T管缝合的患者的临床资料,对照组采用传统的T管缝合方法,研究组采用预置缝线的T管缝合方法:间断缝合,进针和出针时前一针的缝线不打紧,每组24例。比较两组患者T管缝合时间和注水试验阳性率。结果研究组术中T管缝合时间少于对照组[(12.61±0.88)min vs(17.62±0.58)min,t=-23.34,P<0.001],注水试验阳性率低于对照组[0 vs 25%(6/24),P=0.029],差异均有统计学意义。结论应用预置缝线的间断缝合法可提高腹腔镜下T管缝合速度,使缝合更确切,较传统方法有明显优势。展开更多
基金supported by the China Postdoctoral Science Foundation(No.M2019650965)Major R&D Plan of Sichuan Province(No.2020YFQ0034)the National Natural Science Fund Projects(Grant No.51804253).
文摘Water injection for oil displacement is one of the most effective ways to develop fractured-vuggy carbonate reservoirs.With the increase in the number of rounds of water injection,the development effect gradually fails.The emergence of high-pressure capacity expansion and water injection technology allows increased production from old wells.Although high-pressure capacity expansion and water injection technology has been implemented in practice for nearly 10 years in fractured-vuggy reservoirs,its mechanism remains unclear,and the water injection curve is not apparent.In the past,evaluating its effect could only be done by measuring the injection-production volume.In this study,we analyze the mechanism of high-pressure capacity expansion and water injection.We propose a fluid exchange index for high-pressure capacity expansion and water injection and establish a discrete model suitable for high-pressure capacity expansion and water injection curves in fractured-vuggy reservoirs.We propose the following mechanisms:replenishing energy,increasing energy,replacing energy,and releasing energy.The above mechanisms can be identified by the high-pressure capacity expansion and water injection curve of the well HA6X in the Halahatang Oilfield in the Tarim Basin.By solving the basic model,the relative errors of Reservoirs I and II are found to be 1.9%and 1.5%,respectively,and the application of field examples demonstrates that our proposed high-pressure capacity expansion and water injection indicator curve is reasonable and reliable.This research can provide theoretical support for high-pressure capacity expansion and water injection technology in fracture-vuggy carbonate reservoirs.
文摘目的比较腹腔镜下T管缝合时预置缝线法与传统缝合方法的效果差异。方法回顾性分析2020年6月至2023年9月间空军特色医学中心行腹腔镜T管缝合的患者的临床资料,对照组采用传统的T管缝合方法,研究组采用预置缝线的T管缝合方法:间断缝合,进针和出针时前一针的缝线不打紧,每组24例。比较两组患者T管缝合时间和注水试验阳性率。结果研究组术中T管缝合时间少于对照组[(12.61±0.88)min vs(17.62±0.58)min,t=-23.34,P<0.001],注水试验阳性率低于对照组[0 vs 25%(6/24),P=0.029],差异均有统计学意义。结论应用预置缝线的间断缝合法可提高腹腔镜下T管缝合速度,使缝合更确切,较传统方法有明显优势。
