CALGARY, Canada -- The Ana-2 appraisal well in the Romanian Black Sea has confirmed gas pay consistent with the discovery well, according to Sterling Resources. Ana-2 was drilled as a follow up appraisal well following the Ana-1 discovery well, which was drilled and tested earlier this year.
The well encountered gas within the Doina Main sand formation at 1,121 m (3,678 ft) TVD subsea, some 10 m (33 ft) shallower than originally mapped. The well has been extensively evaluated with electric logs, MDT pressure tests and a collection of wireline gas samples. These results confirm the presence of a 39-m (128-ft) gas column with a net pay of 23 m (75 ft) in high quality reservoir sands with porosity of up to 32% and good permeability, the company says.
The pressure data also confirms a gas water contact consistent with the earlier Ana-1 well. The reservoir sands encountered in the Ana-2 well are equivalent to, or slightly better, than those encountered in Ana-1. The original Ana-1 well tested gas, at rates up to 20 MMcf/d of gas under conditions restricted by equipment. Under unrestricted conditions, a final completed rate in excess of 30 MMcf/d per well is anticipated, the company says.
The well also encountered a 5-m (16-ft) gas-bearing reservoir in a shallower horizon at 766 m (2,513 ft) TVD subsea. This shallower horizon was also present in the Ana-1 well and will be further evaluated, in order to determine its feasibility as a new reservoir.
The well reached a total depth of 1,600 m (5,249 ft). Following conclusion of the successful acquisition of the logging suite, the well is now being suspended and rig release is expected by the end of the week. As previously reported, Ana-2 was directionally drilled from a seabed template, which provides re-entry capability for both of the Ana wells for future production, the company says.