Class III tight oil reservoirs have low porosity and permeability,which are often responsible for low production rates and limited recovery.Extensive repeated fracturing is a well-known technique to fix some of these ...Class III tight oil reservoirs have low porosity and permeability,which are often responsible for low production rates and limited recovery.Extensive repeated fracturing is a well-known technique to fix some of these issues.With such methods,existing fractures are refractured,and/or new fractures are created to facilitate communication with natural fractures.This study explored how different refracturing methods affect horizontal well fracture networks,with a special focus on morphology and related fluid flow changes.In particular,the study relied on the unconventional fracture model(UFM).The evolution of fracture morphology and flow field after the initial fracturing were analyzed accordingly.The simulation results indicated that increased formation energy and reduced reservoir stress differences can promote fracture expansion.It was shown that the length of the fracture network,the width of the fracture network,and the complexity of the fracture can be improved,the oil drainage area can be increased,the distance of oil and gas seepage can be reduced,and the production of a single well can be significantly increased.展开更多
With the rapid changes in the field of information,the research and development of optical storage materials with high security and large storage capacity are particularly important in the development of contemporary ...With the rapid changes in the field of information,the research and development of optical storage materials with high security and large storage capacity are particularly important in the development of contemporary society.However,conventional memo ry materials with static fluorescent outputs have the disadvantages of easy simulation and forgery,which limits their practical application in the protection of confidential information.In this research,a dual-stimuli-responsive intelligent fluorescent material based on Tb^(3+)and Eu^(3+)ions doped layered lanthanide hydroxide(LYH:Eu_(x)Tb_(1-x)DPA)was fabricated,which can realize reversible multi-color luminescence conversion(from green to red)by varying the pH and temperature.Combined with the Morse code and security pattern,the multiple encryption and decryption of confidential information and anti-counterfeiting can also be realized.Therefore,the obtained intelligent fluorescent material has a great application prospect for information security.In addition,due to the excellent color tunability,the material can provide the possibility to obtain potential fingerprints with high contrast and no background interference on different color substrates.The unique dual-stimuli-responsive behavior of this material provides more ingenious design inspiration for the design of multi-color intelligent fluorescent devices.展开更多
基金the China Research and Pilot Test on Key Technology of Efficient Production of Changqing Tight Oil(Grant No.2021DJ2202).
文摘Class III tight oil reservoirs have low porosity and permeability,which are often responsible for low production rates and limited recovery.Extensive repeated fracturing is a well-known technique to fix some of these issues.With such methods,existing fractures are refractured,and/or new fractures are created to facilitate communication with natural fractures.This study explored how different refracturing methods affect horizontal well fracture networks,with a special focus on morphology and related fluid flow changes.In particular,the study relied on the unconventional fracture model(UFM).The evolution of fracture morphology and flow field after the initial fracturing were analyzed accordingly.The simulation results indicated that increased formation energy and reduced reservoir stress differences can promote fracture expansion.It was shown that the length of the fracture network,the width of the fracture network,and the complexity of the fracture can be improved,the oil drainage area can be increased,the distance of oil and gas seepage can be reduced,and the production of a single well can be significantly increased.
基金Project supported by the National Natural Science Foundation of China(51773052,U1904168,21805071,61505049)the Program for Science&Technology Innovation Talents in Universities of Henan Province(20HASTIT015,19HASTIT040)。
文摘With the rapid changes in the field of information,the research and development of optical storage materials with high security and large storage capacity are particularly important in the development of contemporary society.However,conventional memo ry materials with static fluorescent outputs have the disadvantages of easy simulation and forgery,which limits their practical application in the protection of confidential information.In this research,a dual-stimuli-responsive intelligent fluorescent material based on Tb^(3+)and Eu^(3+)ions doped layered lanthanide hydroxide(LYH:Eu_(x)Tb_(1-x)DPA)was fabricated,which can realize reversible multi-color luminescence conversion(from green to red)by varying the pH and temperature.Combined with the Morse code and security pattern,the multiple encryption and decryption of confidential information and anti-counterfeiting can also be realized.Therefore,the obtained intelligent fluorescent material has a great application prospect for information security.In addition,due to the excellent color tunability,the material can provide the possibility to obtain potential fingerprints with high contrast and no background interference on different color substrates.The unique dual-stimuli-responsive behavior of this material provides more ingenious design inspiration for the design of multi-color intelligent fluorescent devices.
