Well-to Well Two-Phase Stimulation Using a 10 inch Diameter Line to Initiate Well Discharge in Mahanagdong Geothermal Field, Leyte, Philippines

Abstract

Most of the wells in the Mahanagdong Geothermal Field need stimulation in order to initiate well discharge. This is mainly because the field lies at a much higher elevation of 700-900 mASL and therefore producing wells have a low water level at the wellbore. Added to that is the absence of gas and two-phase pressure build-up in most of the Mahanagdong wells.

To initiate well discharge in Mahanagdong wells with fhis condition, a well-to-well two-phase stimulation is conducted. Previous practice is done through the use of a 2" diameter stimulation line connected to the wing valve of each well. With this line size, stimulation time is longer, -2 days, and the chances of a successful discharge are seldom achieved. Thus, the use of a 1}-inch diameter two-phase branch line as stimulation line is preferred. With the use of this set-up, the time for two-phase stimulation has been greatly reduced and well discharge success rate significantly improved. This paper aims to present the procedures of the well-to-well two-phase stimulation based from actual field activities and drscuss the factors that made the large diameter stimulation line more advantageous.