GSPC to begin testing third zone in fourth KG well

Vol 9, PW 26 (20 Apr 06) Exploration & Production

Gujarat State Petroleum will soon begin testing the third zone at KG#17 its fourth well in shallow water block KG-OSN-2001/3.

Preparations are underway to begin testing the third zone and this is likely to take another week. Sitting at a depth of between 4800 metres and 5000 metres, the third zone sits above the second zone.

As with the second zone, the perforation will be about 10 to 15 metres wide to clearly mark out the producing layer and to prevent any influx of sand. Disappointing results from the second zone have prompted GSPC to test the third zone.

Like the first zone, the second zone also flowed limited gas to surface even though there was significant bottom hole pressure - because the formation was tight. The second zone was not as tight as the first zone, we learn.

The third zone is expected to be even less tight. GSPC was not surprised by the inability of the second zone to flow sufficient quantities of gas to surface.

This was not unexpected, we are told. The formation is very deep and is subjected to very high pressures and high temperatures.

This is the first time in India that such a play has been opened up. Though limited, the second zone flowed enough gas to surface for GSPC to test its composition.

We learn that the gas is 95% methane and the rest is C2 and C3. The good news is that there is no carbon dioxide and no hydrogen sulphide in the gas, adds a source.

Despite the tightness of the first two zones, GSPC has not lost hope at this well. The third zone is not likely to be as tight as the second zone, we hear.

The fourth zone could be even less tight and could yield sufficient gas flow to surface. Still, it remains unclear if GSPC can complete KG#17 as a producer.

A build-up test at the first zone the deepest showed very low permeability at only 0.03 millidarcies. GSPC is looking at a technological breakthrough to produce from this well, we hear.

Ideally, permeability should have been 0.5 millidarcies to get gas to flow to surface.