Deepwater Frontier begins development drilling at D-6

Vol 10, PW 18 (11 Jan 07) Exploration & Production
     

Transocean deepwater drillship Deepwater Frontier has begun development drilling at Reliance’s discovery block KG-DWN-98/3 (D-6).

An industry source tells us Deepwater Frontier began development drilling on 6th December on discoveries Dhirubhai 1 and 3 – both of which have been earmarked for first commercial gas supplies in mid-2008. Another source, aware of these developments, tells us Transocean is drilling the wells â€کbatch’ by â€کbatch’.

“In a â€کbatch’ there are four wells,â€‌ we hear. “Initially only the top sections of these wells are being drilled.

â€‌ The four development wells are: KG-D-6-B-13 KG-D-6-A-9 KG-D-6-A-13 KG-D-6-A-16 “This is a common strategy in implementing development programmes,â€‌ he adds. “Usually the top portions of development wells have a common requirement but the differentiation in terms of equipment required and well completion takes place when you get into the reservoir zone.

â€‌ For each well the top section was drilled to a depth of about 1500 metres to take in the 20-inch casing. After the top section of each well is drilled, the rig begins drilling the bottom section, well by well.

So far the bottom section of well KG-D-6-A-9 has been completed and the bottom section of KG-D-6-A-16 is now being drilled. “This well is expected to be completed by end-February,â€‌ says a source.

These four wells, we learn, are about a kilometre apart from each other and about 50 or 60-km away from the shore. According to another source Reliance plans â€کlarge diameter’ completions for each well.

“Most likely the completions will be either 9 5/8-inches or a 7-inch liner,â€‌ we are told. “This is because the formations are rich (in gas) and Reliance wants to produce large volumes.

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