AWE Ltd. recently announced that preparations are being made to drill a second sidetrack on the Pateke-4H development well, offshore New Zealand.
Operations have been unable to drill past an obstruction in the lower portion of the first sidetrack (ST-1) and a second sidetrack (ST-2) will be drilled from a measured depth of 3587m with an 8.5in. drilling assembly.
The forward work plan requires ST-2 to be drilled to a depth of about 4110m and intersect the F10 reservoir at a horizontal angle of about 90 degrees. Drilling will continue through the F10 reservoir section to a planned total measured depth of 5361m, following which a 6 5/8in. production liner will be installed.
The Kapuni F10 sandstone objective has already been intersected on prognosis with oil shows and real time logging measurements indicating the likely presence of an oil bearing reservoir. The commercial significance of the oil shows will not be clear until the horizontal drilling is completed and the reservoir size and quality is fully assessed.
Based on the additional work required to mitigate the operational difficulties encountered to date, gross pre-completion well costs have increased beyond the pre-spud estimate of $US55 million (AWE share $US2 million). An updated estimate of pre-completion well costs will be issued after the horizontal drilling is completed and the production liner has been installed.
The Pateke-4H development well is in PMP 38158 and AWE is the Operator. Located in the offshore Taranaki Basin, New Zealand, PMP 38158 contains the Tui, Amokura and Pateke fields and has been producing since 2007.
Pateke-4H is targeting a mapped northern extension of the currently producing Pateke field. The well is being drilled in water depth of approximately 124m with a planned total measured depth of 5361m, including a 1272m horizontal section. If successful, the well will be completed for subsequent tie-back to the Tui FPSO (“Umuroa”) for production in 2015.
The Joint Venture partners in PMP 38158 are: AWE Ltd. (operator) 57.5% New Zealand Oil & Gas 27.5% Pan Pacific Petroleum 15.0%
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