GSPC records moderate gas flows at well KG#16

Vol 11, PW 6 (26 Jul 07) Exploration & Production

Gujarat State Petroleum has recorded moderate gas flows at well KG#16 on its eastern offshore discovery block KG-OSN-2001/3.

PETROWATCH learns GSPC recorded a flow rate of 3.5m cf/d from the second zone during a Drill Stem Test by rig Atwood Beacon. An industry source tells us the flow was obtained using a 20/64-inch choke.

“The flowing well head pressure was between 1000 and 1500-psi, bottom hole pressure was around 11,600-psi and the bottom hole temperature was around 375-degrees Fahrenheit,â€‌ we hear. For GSPC, the second zone turned out to be better than the first zone, which lay in the lower portion of the well.

The first zone did not flow much gas because the formation was tight. “This is not surprising given the effect of â€کcompaction’, high temperature and high pressure at such depths,â€‌ says an observer.

Compaction is part of the geological process of â€کlithification’, in which sediments get tightly bound together into rocks. “In fact, this seems to be a pattern in the lower most zones of almost all wells drilled so far by GSPC here.

â€‌ GSPC has yet to get details of the composition of the gas, but first indications are it is dry. “The permeability is quite similar to what was encountered in KG#15 while the porosity ranges between 12% and 16%.

â€‌ GSPC is now planning to test a third zone at KG#16. Earlier plans to test the topmost zone have been called off and Atwood Beacon will, most likely, move to well KG#20.

“This well will be drilled from the same location as KG#16 but will be deviated from the surface itself,â€‌ we hear. GSPC is not worried about the low flow rate from the second zone of KG#16.

“Hydrofracturing will increase the rate of production from the zone,â€‌ says a source. “GSPC has been advised that hydrofracturing will see production go up between six and 10 times.

â€‌ One positive development for GSPC at the second zone of KG#16 is that the temperature is not too high. “There are gels in the market that can withstand such temperatures (while hydrofracturing).