Applicability and potential of polymer injection as an EOR technique for Lower Miocene reservoir in Bach Ho field
Abstract
Polymer for EOR is prepared by radiation techniques. The polymer is synthesised by gamma radiation copolymerisation of acrylamide/or sodium acrylate and N-vinyl pyrrolidone which are hydrophilic monomers. The polymerisation extent and its molecular weight depend on the parameters consisting of radiation dose, dose rate, concentrations of co-monomer and monomer-type. The yield of product is almost 100% when acrylamide is used, higher than using sodium acrylate (~ 71%). The obtained polymer dissolves well not only in water but in brine also. The polymer was not precipitated in hard brines at high temperature (>120oC) and its viscosity slightly reduced around 20% after heating for 30 days at 120oC. The features of polymer including thermal stability, rheology and efficiency of oil recovery were determined. The EOR coefficient of the studied polymer solution was evaluated by the modelling instrument, at submerged oil-well condition. The results show the EOR coefficient enhanced by 12.1% and it satisfies under the condition of Lower Miocene reservoir in Bach Ho oilfield. On the basis of tested results combined with simulation calculations, the economic efficiency of injection technology of radiation-modified polymer solution has also been discussed.
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