| Abstract |
EPT-L/2 is one of production well in geothermal prospective area to support steam supply into the existing power plant. During its production period, the well had a quite rapid decline among other wells due to scaling formation in this well. Hole cleaning and acidizing conducted to break the scale and the well was automatically shut-in during and after both treatment when the well had heated up, the discharge test was trying to asses well EPT-L/2 producibility. But, this well has decreased WHP during the discharge test rapidly, causing the well to not flow. Based on the latest Pressure & Temperature measurement data, it is known that there is a very significant increasing in temperature at depth of 230 mMD. Preliminary analysis of the possibility of a water pocket at that depth is heated by steam-heated water in a shallow aquifer. There is an indication of casing leak namely: There are 2 inflow points on the 13-3 / 8 casing "which are at a depth of 223 mMD and 932 mMD and There is a temperature anomaly that is probably associated with cold water inflow into the casing 13-3 / 8 "at a depth of 223 mMD and 932 mMD. Another survey is needed to ensure that there is a leak/damage to the casing at the depth of the suspected damage to the casing. Well integrity surveillances have been conducted to unlock the root cause such as PTS Survey, Magnetic Thickness Detection survey. Acoustic Leak Flow Analyzer, Caliper Logging, and Downhole Sampling. Based on all the well integrity surveillance, those survey can confirm that there are some casing damage at depth 223 mMD, 390 mMD, 650 mMD, 932 mMD, which is characterized by the inflow of cold water appearance in production casing based on metal loses, soundwave sensor, and caliper data. The acid content of fluid either from steam-heated water or acid dumping during acidizing is negligible based on downhole sample analysis. Eventually, EPT-L/2 suggested being worked over for maintaining the production of the well. |