The pivotal areas for the extensive and effective exploitation of shale gas in the Southern Sichuan Basin have recently transitioned from mid-deep layers to deep layers.Given challenges such as intricate data analysis...The pivotal areas for the extensive and effective exploitation of shale gas in the Southern Sichuan Basin have recently transitioned from mid-deep layers to deep layers.Given challenges such as intricate data analysis,absence of effective assessment methodologies,real-time control strategies,and scarce knowledge of the factors influencing deep gas wells in the so-called flowback stage,a comprehensive study was undertaken on over 160 deep gas wells in Luzhou block utilizing linear flow models and advanced big data analytics techniques.The research results show that:(1)The flowback stage of a deep gas well presents the characteristics of late gas channeling,high flowback rate after gas channeling,low 30-day flowback rate,and high flowback rate corresponding to peak production;(2)The comprehensive parameter AcmKm1/2 in the flowback stage exhibits a strong correlation with the Estimated Ultimate Recovery(EUR),allowing for the establishment of a standardized chart to evaluate EUR classification in typical shale gas wells during this stage.This enables quantitative assessment of gas well EUR,providing valuable insights into production potential and performance;(3)The spacing range and the initial productivity of gas wells have a significant impact on the overall effectiveness of gas wells.Therefore,it is crucial to further explore rational well patterns and spacing,as well as optimize initial drainage and production technical strategies in order to improve their performance.展开更多
2019年12月6日,欧洲纤维产业联盟(EURATEX)召开了理事会,欧洲委员会环境总局长Calleja Crespo先生特邀参加,会议建议了面向EURATEX新循环经济的行动计划。EURATEX的新战略,以"Prospering in the Circular Economy 2019(在循环经济...2019年12月6日,欧洲纤维产业联盟(EURATEX)召开了理事会,欧洲委员会环境总局长Calleja Crespo先生特邀参加,会议建议了面向EURATEX新循环经济的行动计划。EURATEX的新战略,以"Prospering in the Circular Economy 2019(在循环经济中的繁荣)"标题,由在9个行动计划之下,12个重点要点、6个条件、38个具体建议构成。展开更多
2019年12月6日,欧洲纤维产业联盟(EURATEX)召开了理事会,欧洲委员会环境总局长Calleja Crespo先生特邀参加,会议建议了面向EURATEX新循环经济的行动计划。EURATEX的新战略,以“Prospering in the Circular Economy 2019(在循环经济中的...2019年12月6日,欧洲纤维产业联盟(EURATEX)召开了理事会,欧洲委员会环境总局长Calleja Crespo先生特邀参加,会议建议了面向EURATEX新循环经济的行动计划。EURATEX的新战略,以“Prospering in the Circular Economy 2019(在循环经济中的繁荣)”标题,由在9个行动计划之下,12个重点要点、6个条件、38个具体建议构成。展开更多
We performed a multifractal analysis using wavelet transform to detect the changes in the fractality of the USD/JPY and EUR/JPY exchange rates, and predicted their extreme values using extreme value theory. After the ...We performed a multifractal analysis using wavelet transform to detect the changes in the fractality of the USD/JPY and EUR/JPY exchange rates, and predicted their extreme values using extreme value theory. After the 1997 Asian financial crisis, the USD/JPY and EUR/JPY became multifractal, then the USD/JPY became monofractal and stable, and yen depreciation was observed. However, the EUR/JPY became multifractal and unstable, and a strong yen depreciation was observed. The coherence between the USD/JPY and EUR/JPY was strong between 1995 and 2000. After the 2007-2008 financial crisis, the USD/JPY became monofractal and stable, and yen appreciation was observed. However, the EUR/JPY became multifractal and unstable, and strong yen appreciation was observed. Various diagnostic plots for assessing the accuracy of the GP model fitted to USD/JPY and EUR/JPY are shown, and all the diagnostic plots support the fitted GP model. The shape parameters of USD/JPY and EUR/JPY were close to zero, therefore the USD/JPY and EUR/JPY did not have finite upper limits. We predicted the maximum return level for the return periods of 10, 20, 50, 100, 350, and 500 years and their respective 95% confidence intervals (CI). As a result, the 10-year and 100-year return levels for USD/JPY were estimated to be 149.6 and 164.8, with 95% CI [143.2, 156.0] and [149.4, 180.1], respectively.展开更多
文摘The pivotal areas for the extensive and effective exploitation of shale gas in the Southern Sichuan Basin have recently transitioned from mid-deep layers to deep layers.Given challenges such as intricate data analysis,absence of effective assessment methodologies,real-time control strategies,and scarce knowledge of the factors influencing deep gas wells in the so-called flowback stage,a comprehensive study was undertaken on over 160 deep gas wells in Luzhou block utilizing linear flow models and advanced big data analytics techniques.The research results show that:(1)The flowback stage of a deep gas well presents the characteristics of late gas channeling,high flowback rate after gas channeling,low 30-day flowback rate,and high flowback rate corresponding to peak production;(2)The comprehensive parameter AcmKm1/2 in the flowback stage exhibits a strong correlation with the Estimated Ultimate Recovery(EUR),allowing for the establishment of a standardized chart to evaluate EUR classification in typical shale gas wells during this stage.This enables quantitative assessment of gas well EUR,providing valuable insights into production potential and performance;(3)The spacing range and the initial productivity of gas wells have a significant impact on the overall effectiveness of gas wells.Therefore,it is crucial to further explore rational well patterns and spacing,as well as optimize initial drainage and production technical strategies in order to improve their performance.
文摘2019年12月6日,欧洲纤维产业联盟(EURATEX)召开了理事会,欧洲委员会环境总局长Calleja Crespo先生特邀参加,会议建议了面向EURATEX新循环经济的行动计划。EURATEX的新战略,以"Prospering in the Circular Economy 2019(在循环经济中的繁荣)"标题,由在9个行动计划之下,12个重点要点、6个条件、38个具体建议构成。
文摘2019年12月6日,欧洲纤维产业联盟(EURATEX)召开了理事会,欧洲委员会环境总局长Calleja Crespo先生特邀参加,会议建议了面向EURATEX新循环经济的行动计划。EURATEX的新战略,以“Prospering in the Circular Economy 2019(在循环经济中的繁荣)”标题,由在9个行动计划之下,12个重点要点、6个条件、38个具体建议构成。
文摘We performed a multifractal analysis using wavelet transform to detect the changes in the fractality of the USD/JPY and EUR/JPY exchange rates, and predicted their extreme values using extreme value theory. After the 1997 Asian financial crisis, the USD/JPY and EUR/JPY became multifractal, then the USD/JPY became monofractal and stable, and yen depreciation was observed. However, the EUR/JPY became multifractal and unstable, and a strong yen depreciation was observed. The coherence between the USD/JPY and EUR/JPY was strong between 1995 and 2000. After the 2007-2008 financial crisis, the USD/JPY became monofractal and stable, and yen appreciation was observed. However, the EUR/JPY became multifractal and unstable, and strong yen appreciation was observed. Various diagnostic plots for assessing the accuracy of the GP model fitted to USD/JPY and EUR/JPY are shown, and all the diagnostic plots support the fitted GP model. The shape parameters of USD/JPY and EUR/JPY were close to zero, therefore the USD/JPY and EUR/JPY did not have finite upper limits. We predicted the maximum return level for the return periods of 10, 20, 50, 100, 350, and 500 years and their respective 95% confidence intervals (CI). As a result, the 10-year and 100-year return levels for USD/JPY were estimated to be 149.6 and 164.8, with 95% CI [143.2, 156.0] and [149.4, 180.1], respectively.
