The Effects of the Urea and Mixture-T on Residual Oil Gasification Into Methane Under Reservoir Simulation System

Abstract

A simulation reservoir system was designed to study the process of transforming residual oil into methane by indigenous microbes under initial pressure 10MPa, 55oC and the simulation time was 465 days. The Urea was used with four levels (U), U1 0mg/L, U2 200mg/L, U3 300mg/L, U4 400mg/L. the mixture-T (surfactant Tween 80 and complexing agent EDTA, proportion was 5:1) had five levels: 0CMC(Critical Micelle Concentration), 0.5CMC, 1CMC, 2CMC, 3CMC. The CMC was 14mg/L and the sterile treatments were control. When the urea concentration was 300mg/L or 400mg/L, the methane yield were both highest and the difference was not significant. When the additives mixture-T amount reached CMC, the methane yield was highest and among 1CMC, 2CMC and 3CMC treatments the difference was not significant. Meanwhile the urea and mixture T had additive effect on methane yield(3CMC-U4 treatment was highest), and oil removal efficiency had similar trend.