| Title | Well-To-well Two Phase Injection Using a 10IN Diameter Line to Initiate Well Discharge in Mahanagdong Geothermal Field, Leyte, Philippines |
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| Authors | Christine H. Siega, Virgilio S. Saw, Romeo P. Andrino Jr. and Garry F. Cañete |
| Year | 2006 |
| Conference | Asian Geothermal Symposium |
| Keywords | two phase injection, Mahanagdong, 10in injection line, liquid dominated |
| Abstract | Most of the wells in the Mahanagdong Geothermal Field need to be induced in order to 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 this condition, additional energy must be put into the water column of a static well to convert it to two-phase column and for pressure to build-up. There are several methods use for this purpose, namely; a) air (or gas) compression; b) gas lifting; and c) well-to-well two-phase injection. The most commonly used method at PNOC-EDC fields is the well-to-well two-phase injection. This paper discusses in details the procedures of a well-to-well two-phase injection using two different diameter sizes of injection lines. Previous practice is done through the use of a 2” diameter injection line connected to the wing valve of each well. Using this line size, injection time is longer, ~ 2 days, with the chances of a successful discharge seldom achieved. In contrast, the use of a 10in diameter line has greatly reduced the time for two-phase injection and improved significantly the chances of a successful well discharge. |