| Title | Managing the Decline Rate at the South Sector Production Area of Darajat Geothermal Field, Indonesia |
|---|---|
| Authors | Martiady, Krisnendar; Dawud H, Abu; Pasaribu, Fernando; Roberts, Jeffrey; Sugandhi, Arias |
| Year | 2011 |
| Conference | Geothermal Resources Council Transactions |
| Keywords | Darajat; decline; superheat; South Sector; geothermal |
| Abstract | The South Sector Production area of Darajat Geothermal Field has been producing since 1994, the commercial operation of 55 MW Darajat Unit-I. The wells supplying to the steam gathering system in this area is situated close to Darajat surface manifestation, which recently experiencing significant land instability. The wells are characterized by relatively high NCG content, lower shut-in pressure and slightly superheated steam at the wellhead compared to majority of the wells at the northern area of Darajat field. The rapid decline rate of the wells, suspected by in-field injection impact and condensation cell at the field margin, calls for Darajat Resource Management to establish a comprehensive surveillance plan and wellbore integrity monitoring to sustain and improve the production from this area. This paper discussed different problem characteristic of each well in this south production area. Shallow casing integrity has forced the DRJ-4 to be suspended, rapid decline rate at DRJ-13 has caused the well plugged by scale and produce zero steam from initial 40 kg/s of steam, rapid growing of superheat at DRJ-8 from wellhead to bottom has limited the well operating mode to only at high wellhead pressure, are examples of complex behavior of wells in this area. However, with comprehensive surveillance plan, production optimization efforts and high commitment to safe operations, steam production could still be sustained and the steam gathering system continues operating safely. |