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Stebbing remains untested
Posted 16.07.2012 10:02:23 av John Bradbury
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Drilling on the Stebbing prospect in the South Falklands has had to be halted due to technical difficulties downhole after strong gas shows were encountered.

Well operator Borders and Southern Petroleum said today that the the 61/25-1 well penetrated an upper Tertiary target on prognosis but was unable to reach a lower drilling target due to anomalous pressure, so the lower target remains unevaluated.

Borders and Southern said “very strong gas shows” were encountered in the upper Tertiary drilling target, and petrophysical analysis of wireline logs obtained between 2,500 metres and 2,651 metres, (8,200 – 8,695 feet ) containing thin siltstones and claystones had a net to gross ratio of 36% and average porosity of 19%.

“Due to the thin bedded character of this sequence it was not possible to obtain a clear indication of the fluid type or saturation. The geophysical anomalies identified on seismic are coincident with this zone containing hydrocarbons.,” the company has revealed, but: “Our initial assessment is that this upper target is unlikely to be commercial although further technical evaluation is required.”

More strong gas shows continued further down the hole: “However, progress was slow due to lost circulation and well flows which occurred in consecutive hole sections. Several of these flows contained gas,” B&S says.

“On each occasion the well was successfully controlled but it became necessary to set additional strings of casing, using the contingency casing considered in the well design. In the final 6-inch hole section, the fluid pressures continued to rise giving further well flows and it became impossible to continue drilling whilst maintaining well integrity. A decision was therefore made to cease drilling.”

Borders and Southern says that although it was disappointing not to have reached all the potential reservoir targets, geological and engineering data will be scrutinised to understand the complexity of the Stebbing prospect.

“The company now intends to plug and abandon the well in line with regulatory requirements and assign the rig to Falkland Oil and Gas.”

Stebbing was drilled to a total depth of 3,060 metres (10,036 feet) and a true vertical depth of 3011 m (9,876 ft) in PL 018, located 170 kilometres (106 miles) m south of the Falkland Islands, by the Leiv Eiriksson semi-submersible, which mobilised after drilling for Cairn Energy offshore Greenland. Borders & Southern operated the Stebbing well, with 100% interest.

Meanwhile the company is continuing to analyse fluid samples from its earlier 61/17-1 Darwin gas and condensate discovery, and results from laboratory tests are on track to be delivered with a 10-week schedule.
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