Lancaster tests confirm basement potential

Hurricane Exploration has completed production testing of its Lancaster oil discovery west of the Shetlands.

Offshore staff

ALTON, UK-- Hurricane Exploration has completed production testing of its Lancaster oil discovery west of the Shetlands.

The company drilled a side track on well 205/21a to determine the reservoir properties of the basement structure and to test its commercial potential.

The main reservoir target comprised two seismic scale faults separated by a section of fractured reservoir. Evaluation included production logging and two drillstem tests, with the following results: 

- DST-1 examined over 400 ft (122 m) of open hole, targeting the shallower of the two faults. The test flowed 38º API crude at a constrained, stabilized rate of 2,350 b/d on a 48/64-in. choke. Logging data suggests that virtually the entire logged section contributed to flow, with certain fractures dominating production rates

- DST-2 examined a 600-ft (183-m) open-hole section, testing the combined output from the two seismic faults and the intervening section of unfaulted reservoir. This test also generated 38º API crude at the same choke, with stabilized oil flow of 2,450 b/d and 8% water flow at a rate of 200 b/d. However, logging data revealed that water production was limited to a single fracture.

Hurricane is compiling a wireline logging suite, and will continue operations into August, when the well will be suspended for future use.

Chief executive Robert Trice said: “We have confirmed that our strategy to drill with a balanced brine system and deploy sequential testing is highly effective. The test results...confirm the basement reservoir is not only saturated with mobile oil, but is also productive outside of the target reservoir fault zones.”

Contractors involved in the program are Schlumberger, the main testing service supplier; Axis Well Technology, well test technical support; AGR Petroleum Services for well management; and Dolphin Drilling.

07/29/2010

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