Application status and prospects of stimuli-responsive materials in oil and gas fields
Oilfield chemicals play a crucial role in drilling and completion,fracturing and acidizing,profile control and water plugging,emulsification and viscosity reduction,oil-water separation,etc.However,the harsh oil reservoir environment such as low permeability,high temperature,high salinity,extreme pH,and changes in temperature or pH has brought severe challenges to the research of polymers and surfactants used in oilfield chemicals.The traditional methods of introducing sulfonic groups to achieve temperature-resistant or salinity-resistant and increasing the relative molecular mass of oil displacement agents can no longer meet the oilfield needs.In this review,the principle and properties of temperature-sensitive polymers,pH-sensitive polymers,magnetic-responsive polymers,CO2-sensitive polymers and surfactants,and saline-sensitive polymers in response to environmental changes were introduced.The application of 5 types stimuli-responsive materials in drilling and completion,enhanced oil recovery,emulsification and demulsification,fracturing and acidizing,profile control and water plugging,oil-water separation and so on were summarized.Finally,the development prospect of stimuli-responsive materials in oil and gas production was discussed.
stimuli-responsive materialsoil and gas productiontemperature-sensitivepH-sensitivemagnetic-responsiveCO2-sensitivesalinity-sensitive
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