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Otto Energy: SM 71 F2 well completion and new SM 71 F3 well to be drilled

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Oilfield Technology,

Otto Energy Limited has announced that the OCS G-34266 #F-2 well (‘SM 71 F2’), operated on behalf of the joint venture by Byron Energy Ltd within the South Marsh Island 71 (‘SM 71’) lease in the Gulf Of Mexico shelf, will be completed for near term production in the B65 sand. In addition, the joint venture has approved the drilling of the F3 development well, expected to spud next week, with the intention to provide a second take point in the D5 sand zone.

SM 71 F2 Well

On 27 December 2017 Otto reported that the SM 71 F2 appraisal well encountered four discrete hydrocarbon bearing sands, including the B65 and D5, The joint venture has decided to case the F2 well to a depth of 7700 ft measured depth (“MD”), 130 ft MD below the base of the B65 Sand.

The F2 well will now be used to provide a take point to produce hydrocarbons from the B65 Sand. The F2 well can also be used in the future to produce the J1 Sand and B55 Sand after cessation of production in B65 Sand.

On 1 January 2018, current operations are running 7 5/8 in. casing before suspending the well for a short period before completion for production.

Further petrophysical analysis of the net oil pay counts confirms the preliminary analysis, reported on 27 December 2017.

The previously reported net oil pay counts based on transmitted data, will serve as final internal pay counts as the additional higher resolution log while drilling (“LWD”) memory data was not retrieved. Real time LWD porosity data indicates the porosity of both the B65 and D5 Sands to be consistent with other wells the area with porosities ranging up to 31% with a high net to gross sand ratio in each zone.

SM 71 F3 Well

The joint venture has also decided to drill the SM 71 F3 well and utilise it as a D5 development well. The very significant results from the F2 well have provided the basis for the joint venture to make the decision to accelerate drilling of the F3 well.

Given the high quality and thickness of the D5 Sand encountered in the F2 well and the fact that the joint venture has an option to drill a second well under the existing Ensco drilling contract (at current day rates), it has been decided to drill SM 71 F3 well immediately using the Ensco 68 rig, rather than releasing it.

As designed, the SM 71 F3 well will intersect the D5 Sand very near the point that the F2 well intersected the D5 Sand. The F3 well will provide a second take point in the D5 Sand reservoir in addition to the F1 well, which was drilled in 2016. The engineering design of the F3 well will allow for a borehole angle of 24 degrees with shorter measured depth than the F2 well which had an angle of 60°.

The SM 71 F3 development well will be drilled to planned total depth of 7624 ft/2324 m MD, equivalent to 7423 ft/2263 m true vertical depth (“TVD”). F3 is estimated to take approximately 30 days to drill to total depth and evaluate from the spud date. Operations on the F3 should begin later this week after work is completed on the F2 and will be conducted under an approved permit the operator applied for in November in anticipation of a desirable result in the SM 71 F2 well.

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