In this study,to meet the stringent requirements on the hydrophobicity of nano-SiO_(2)particles for use in depressurization and enhanced injection operations in high-temperature and high-salinity oil reservoirs,second...In this study,to meet the stringent requirements on the hydrophobicity of nano-SiO_(2)particles for use in depressurization and enhanced injection operations in high-temperature and high-salinity oil reservoirs,secondary chemical grafting modification of nano-SiO_(2)is performed using a silane coupling agent to prepare superhydrophobic nano-SiO_(2) particles.Using these superhydrophobic nano-SiO_(2)particles as the core agent,and liquid paraffin or diesel as the dispersion medium,a uniform dispersion of nano-SiO_(2)particles is achieved under high-speed stirring,and a chemically enhanced water injection system with colloidal stability that can be maintained for more than 60 d is successfully developed.Using this system,a field test of depressurization and enhanced injection is carried out on six wells in an oilfield,and the daily oil production level is increased by 11 t.The cumulative increased water injection is 58784 m^(3),the effective rate of the measures was 100%,and the average validity period is 661 d.展开更多
Study on the residual oil distribution regularity is the important thing during the middle and later stage of the oilfield.With understanding and development of oilfield,the research methods of remaining oil are varie...Study on the residual oil distribution regularity is the important thing during the middle and later stage of the oilfield.With understanding and development of oilfield,the research methods of remaining oil are varied.Well block A is a low permeability oilfield and complex relationship between injection wells and production wells.The well pattern has low control of sand body.Based on the characteristics and the geological and dynamic data,technology of integrated 3-D geological modeling with reservoir numerical simulation is ensured to study the residual oil.Finally,deposition facies and flowing units are studied to analyze the residual oil distribution regularity.As a result,the types of residual oil were confirmed and the basis for the following development adjustment of the well block is provided.展开更多
基金funded by National Natural Science Foundation of China (grant number 42207083)the project of SINOREC (No.322052)
文摘In this study,to meet the stringent requirements on the hydrophobicity of nano-SiO_(2)particles for use in depressurization and enhanced injection operations in high-temperature and high-salinity oil reservoirs,secondary chemical grafting modification of nano-SiO_(2)is performed using a silane coupling agent to prepare superhydrophobic nano-SiO_(2) particles.Using these superhydrophobic nano-SiO_(2)particles as the core agent,and liquid paraffin or diesel as the dispersion medium,a uniform dispersion of nano-SiO_(2)particles is achieved under high-speed stirring,and a chemically enhanced water injection system with colloidal stability that can be maintained for more than 60 d is successfully developed.Using this system,a field test of depressurization and enhanced injection is carried out on six wells in an oilfield,and the daily oil production level is increased by 11 t.The cumulative increased water injection is 58784 m^(3),the effective rate of the measures was 100%,and the average validity period is 661 d.
文摘Study on the residual oil distribution regularity is the important thing during the middle and later stage of the oilfield.With understanding and development of oilfield,the research methods of remaining oil are varied.Well block A is a low permeability oilfield and complex relationship between injection wells and production wells.The well pattern has low control of sand body.Based on the characteristics and the geological and dynamic data,technology of integrated 3-D geological modeling with reservoir numerical simulation is ensured to study the residual oil.Finally,deposition facies and flowing units are studied to analyze the residual oil distribution regularity.As a result,the types of residual oil were confirmed and the basis for the following development adjustment of the well block is provided.
