| Abstract |
The application of water tracers form an integral part of PNOC-EDC's reservoir management strategy in terms of mitigating effects of reinjection fluids. Tracers, such as Naphthalene disulfonate (NDS), sodium Flourescein, Iodine-125, Iodine-13`, have been utilized mainly to detect reinjection flow paths and quantify the fluids that return to the production sectors. Resource management measures have been put in place to counteract the drastic effect of the injection fluids into the production sectors: such as optimizing the injection capacities of the reinjection wells and adoption of production and reinjection well utilization strategy. However, with some production fields becoming more steam-dominated as a result of pressure drawdown due to prolonged exploitation, these liquid tracers become less useful. Thus, there is a need to search for appropriate or applicable tracers for vapor-dominated reservoirs. In other geothermal fields worldwide, such as in Indonesia, USA and South America, alcohols, tritium, sodium hexafluoride (SF^) and hydrofluorocarbons (HFC) have been experimented on as vapor tracers. Some of the countries have proven the utilization of theses tracers in this kind of environment. PNOC EDC and the International Atomic Energy Agency (IAEA) have collaborated to conduct tests in Leyte Geothermal Production Field on the usability and applicability of tritium as tracers in the highly vapor dominated part of the Tongonan reservoir. This paper presents the initial results gathered and evaluation of tritium as vapor tracer. |