Technology improvement to create EOR chemical system at pilot scale and trial industrial application for Miocene reservoirs in Bach Ho field, Cuu Long basin

This paper introduces the process of optimising the pilot-scale production of an EOR chemical system for trial industrial application based on laboratory testing results, the results of evaluating EOR efficiency on Miocene reservoir samples taken from Bach Ho field and the results of the chemical injection test on the reservoir dynamic model for wells 1605 and 1609 in the southern part of Bach Ho field. The main components of the surfactant chemical systems consist of sodium olefin sulfonate (SOS), alkyl aryl sulfonate (AAS), sodium dodecylbenzene sulfonate (SDBS)and nonylphenol ethoxylate (NPEO), which were improved by minimising interfacial tension (IFT), increasing the ability to form micro-emulsions as well as resistance to temperature and high mineralisation/salinity. The polymer composition of the chemical system was improved by increasing the viscosity and reducing the mobility of the injected fluid system to increase the sweep coefficient.