List of major events/results
- GPK2 has been extended to its new depth of 5000 m (true vertical depth=TVD). This included also the removing of the existing casing, cementing, reaming out from 6.25" to 8.5", anchoring the 4200 m casing, etc. New high temperature cement and new metal packers allowed a successful completion of the new GPK2.
- The predicted temperature of 200° C was measured at a depth of 4950 m (TVD).
- An additional microseismic monitoring well OPS4 has been drilled to a depth of 1500 m and instrumented to improve the accuracy of microseismic event locations.
- The measurement of the initial, natural injectivity of around 0.2 l/MPa/s in the new deep part of GPK2 was consistent with the observations in the depth range of 3200-3800 m .
- The stimulation of the new GPK2 in summer 2000 showed the
following results:
- Starting the stimulation at high flow rates and heavy brines (1200 kg/m³) initiated and developed fluid inlets/exists at the greatest possible depth in GPK2
- The overpressure needed to create the large reservoir was lower than anticipated.
- The new reservoir at 5000 m showed closer boundaries compared to the upper reservoir at 3000-3600 m.
- No leak-off to the upper reservoir has been detected.
- The reservoir extends along NNW/SSE, about 500 m wide, 1500 m long and 1500 m tall.
- GPK2 is planned as a production well for the Scientific Pilot Plant. The fact that the majority of the fluid left the open hole during stimulation at the bottom is very encouraging, since it can be anticipated that most of the produced fluid enters the well at around 195°-°200°C.