In light of the constraints and difficulties of drilling in-fill wells, drilling of additional wells from peripheral pads is one of the current resource management strategies in the Leyte Geothermal Production Field to sustain steam supply for the target generation. Among the pads under consideration are Pad 403 in the northeastern periphery of Upper Mahiao sector, Pad MG-F in the eastern block of Mahanagdong sector, and Pad 208 to the northeast of Tongonan-1 sector. This strategy will disperse mass extraction to the periphery of the reservoir and allow recovery in the drawn-down central portion of the field.
Pad 403, a 20 MW peripheral development, is an idle production pad located in the northeast boundary of the field. The first well, 403, was drilled in 1980 to probe for the northeastern limits of the Tongonan Geothermal field. The second well, 424D, was drilled in 2006 to gain more subsurface information particularly on the permeability of structures east of Pad 403 which had not been previously intersected by earlier wells.
To assess the present total production capability of the pad, wells 403 and 424D were subjected to simultaneous discharge to the silencers during the 1st and 3rd quarters of 2008. The simultaneous discharge also aimed to evaluate possible output interference between the two wells that may result to output sharing. The results of the simultaneous discharges were also vital in defining future targets of additional production wells, 425D and 426D, as well as in evaluating the commercial potential of this first peripheral pad development in LGPF.
In Pad MG-F, a 40 MW development, the first well MG40D was drilled towards the northwest to access newly mapped structures and validate the resistivity survey results. Four more wells are programmed for drilling in the next 2 years. In Pad 208, a 20 MW development, well 208 was already drilled and two more wells are programmed for drilling in 2009. This will augment the steam supply requirements of the Tongonan-1 power plant, the first power plant to operate in LGPF. Pipeline construction in all these peripheral developments are in full swing with Pad 403 commissioning in March 2009.

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