Fluid Transport and Silica Scaling Potential in Cross-Country Reinjection Line-The Case of 4RC RI Line, Leyte, Philippines

Abstract

Optimized transport of waste fluids in the 4RC reinjection main line is determined by evaluating the silica scalingpotential at dgerent load utilization. This k in view of the reinjection management strategv for the South Sambaloran and Tongonan sectors of the 700 W e Lqte Geothermal Production Field. Diversion of wastewater load in 4RC line to the Mahiao in-feld reiPljection sink i5 being considered to provide pressure support and arrest the observedfieldwide pressure drawdown.

Results of the study show that at current utilization (200 kds)). the scalingpotential at 4RC reinjection main line is within acceptable levels (SSR1.13). However, minimum utilization should be 100 kg/s. Flows lower than this may cause severe silica deposition. The reinjection management strategy is feasible up to a maximum divertedjlow of 100 kg/sfi.om the 4RC line to the Mahiao reinjection sink. At this utilization, silica scaling potential throughout the pipeline is still within acceptable levels (SSI .( 1.16). Validation of simulated values at 150 kg/s show that the actual and calculated SSI values and total brine residence time are comparable.