| Abstract |
Several production wells at the Sandawa sector discharged acidic fluids. The separated brine is highly saturated with respect to amorphous silica. It has an average Silica Saturation Index (SSI) of 1.45 at 770░C suggesting high potential of silica deposition along the reinjection line. Wells KN-2D and KN- 38 which discharge fluids with pH ~ 5. 0we re utilized to inhibit the deposition of silica along the reinjection line. Using the SOLVEQ speciation program at actual line condition, fluid chemistry of wells KN- 20 and KN-3B and the resulting mixed brine at the separator vessels SV600 and SV607 showed a pH of ~ 5. 0an d indicated a potential for corrosion. However, Eh-pH diagram suggests that active corrosion is unlikely to occur. Instead, passive corrosion products consisting of iron oxides and sulfides will likely develop and form a ,protective film on the underlying steel and result in low corrosion rate. Silica induction and profiling studies along the reinjection line showed that silica has not deposited even with high SSI. The stable reinjection capacity of well KN-IRD aRer one year of utilization also confirms that significant silica deposition has not occurred in the well. To monitor the rate of uniform corrosion at the wellhead assembly and production lines, ultrasonic test (UT) are conducted regularly. |