CALGARY -- Ithaca Energy’s sidetrack well (30/6a-8Z) in the Stella in the UK North Sea field has confirmed a fully hydrocarbon-saturated reservoir interval in the Andrew sandstone.
Sampling and pressure tests have also provided essential fluid composition data to help scope development of the field.
Well 30/6a-8Z was drilled to determine the nature of the hydrocarbons at an intermediate depth in the reservoir up-structure from the initial vertical well (30/6a-8).
Ithaca says the data gleaned allows accurate interpolations that define the compositional changes from gas and condensate to oil with increasing depth.
The well intersected an 18-ft (5.5 m) true vertical thickness section of Palaeocene Andrew sandstone reservoir, similar in thickness to that seen in other wells on and near the Stella structure.
A full suite of wireline logs were acquired which indicate porosities up to 27%, providing further confirmation of the lateral extent and quality of the reservoir interval.
A full set of pressure data were also acquired to allow Ithaca to help determine the depth of the gas/oil contact in the Andrew reservoir, above the light oil encountered in the vertical well (30/6a-8). Further data was gathered over the Ekofisk chalk interval penetrated by the well.
Ithaca says the Stella appraisal program is complete, and the rig will be demobilized after 89 days on location (the pre-drill estimate was 79 days).
The partners in block 30/6a (Stella and Harrier) are Ithaca (68.33%) and Dyas UK Ltd (31.67%). Post completion of a farm out to Challenger Minerals (North Sea), interests will be Ithaca (50.33%), Dyas UK (31.67%), and Challenger (18.00%).
Ithaca concludes Stella side-track
Ithaca Energy’s sidetrack well (30/6a-8Z) in the Stella in the UK North Sea field has confirmed a fully hydrocarbon-saturated reservoir interval in the Andrew sandstone.