9
July
2010

IDDP-1 flow test.

The flow test of IDDP-1 began in March 2010, when the well was initially discharged. The initial flow test (phase 1) took place during 22-31 March 2010, when the well discharged through a DN100 (4’’) pipeline. The full-initial flow test (phase 1b) began 11 May, by discharging the well through a DN250 (10’’) pipeline with a 125 mm orifice. Initially the flow was wet but it has been superheated since May 18. This test is ongoing.

A video was made, showing the discharge after a new 125 mm orifice had been inserted. In this video we can see the discharge changing from wet to dry steam. The entire video, almost 10 minutes long can be viewed via youtube, but here on the right we have a short version, 2 minutes, 21 second.

Approx 20 MW electric power.

The diagram below shows the development of P, T during the flow test phase 1b. The following has been observed:

  • The flow from the well is over 30 kg/s of dry superheated steam, corresponding to ~20 MW electric power
  • The P and T at well head have been monitored and the T has been rising since beginning
  • The steam is superheated with an enthalpy close to 3100 kJ/kg. The discharge steam is now ~120°C superheated and its temperature, superheating and enthalpy is still rising at the same time as pressure is not changing significantly, dropping slightly
  • Samples have been collected from the well for chemical analysis
  • Corrosion, erosion and some scaling have been observed in the exhaust pipelines

Initially the flow was wet but it has been superheated since May 18, as said above. During this time some modifications and improvements of the well head platform and pipelines have turned out to be needed as listed below:

  • Erosion/corrosion of bends has been observed. This calls for replacement of one bend and a modification of the pipeline to reduce erosion
  • The rise of the well head, due to thermal expansion, is a little more than expected. Because of this the well head platform and the pipeline will be modified slightly
  • The orifice in the discharge line has been replaced once. The diameter of the orifice had increased by 10 mm when it was replaced. It is necessary to check the diameter of the present orifice and replace it if necessary

In order to carry out the required maintenance the discharge will be stopped temporarily later this month. After that the flow test will continue for several more months. As seen on the diagram below the temperature of the superheated steam has been rising continuously and is now ~330°C at 16.5 bar-g pressure. The fluid discharge has been sampled regularly as said above, and tests on the steam quality and properties for electricity production are ongoing.