To meet the requirements of marine natural gas hydrate exploitation,it is necessary to improve the penetration of completion sand control string in the large curvature borehole.In this study,large curvature test wells...To meet the requirements of marine natural gas hydrate exploitation,it is necessary to improve the penetration of completion sand control string in the large curvature borehole.In this study,large curvature test wells were selected to carry out the running test of sand control string with pre-packed screen.Meanwhile,the running simulation was performed by using the Landmark software.The results show that the sand control packer and screen can be run smoothly in the wellbore with a dogleg angle of more than 20°/30 m and keep the structure stable.Additionally,the comprehensive friction coefficient is 0.4,under which and the simulation shows that the sand control string for hydrate exploitation can be run smoothly.These findings have important guiding significance for running the completion sand control string in natural gas hydrate exploitation.展开更多
Gravel packing is a promising sand control method for natural gas wells in deepwater environments.However,premature screenout,wellbore shrinkage,and packer installationlimit gravel packing efficiency in long-reach hor...Gravel packing is a promising sand control method for natural gas wells in deepwater environments.However,premature screenout,wellbore shrinkage,and packer installationlimit gravel packing efficiency in long-reach horizontal wells.In this paper,we introduce a novel multi-path screen that provides alternative pathways once the circulating annulus is blocked.The basic geometric parameters of the screen are given first.Then,the frictional pressure loss in each circulating unit during packing is evaluated.Finally,the application of this screen in a long-reach horizontal well in the northern South China Sea is discussed.The application results demonstrate the applicability of multi-path screens in complex downhole completion conditions.The multi-path screen described here may widen the application ranges of gravel packing techniques to meet the exploitation demand for unconventional natural gas resources,such as marine natural gas hydrate.展开更多
基金supported jointly by one of the major projects of Basic and Applied Basic Research in Guangdong Province“Key Basic Theory Research for Natural Gas Hydrate Trial Production in Shenhu Pilot Test Area”(2020B0301030003)the project from Southern Marine Science&Engineering Guangdong Laboratory Guangzhou City“Research on New Closed Circulation Drilling Technology without Riser”(GML2019ZD0501)the special project for hydrate from China Geological Survey“Trial Production Implementation for Natural Gas Hydrate in Shenhu Pilot Test Area”(DD20190226)。
文摘To meet the requirements of marine natural gas hydrate exploitation,it is necessary to improve the penetration of completion sand control string in the large curvature borehole.In this study,large curvature test wells were selected to carry out the running test of sand control string with pre-packed screen.Meanwhile,the running simulation was performed by using the Landmark software.The results show that the sand control packer and screen can be run smoothly in the wellbore with a dogleg angle of more than 20°/30 m and keep the structure stable.Additionally,the comprehensive friction coefficient is 0.4,under which and the simulation shows that the sand control string for hydrate exploitation can be run smoothly.These findings have important guiding significance for running the completion sand control string in natural gas hydrate exploitation.
基金supported by the National Natural Science Foundation of China(Grant No.41976074)Key Laboratory of Gas Hydrate,Guangzhou Institute of Energy Conversion,Chinese Academy of Sciences(Grant No.E129kf1301).
文摘Gravel packing is a promising sand control method for natural gas wells in deepwater environments.However,premature screenout,wellbore shrinkage,and packer installationlimit gravel packing efficiency in long-reach horizontal wells.In this paper,we introduce a novel multi-path screen that provides alternative pathways once the circulating annulus is blocked.The basic geometric parameters of the screen are given first.Then,the frictional pressure loss in each circulating unit during packing is evaluated.Finally,the application of this screen in a long-reach horizontal well in the northern South China Sea is discussed.The application results demonstrate the applicability of multi-path screens in complex downhole completion conditions.The multi-path screen described here may widen the application ranges of gravel packing techniques to meet the exploitation demand for unconventional natural gas resources,such as marine natural gas hydrate.
