EnQuest gets go-ahead for North Sea Scolty/Crathes subsea tiebacks

Offshore staff

LONDON – Britain’s Oil & Gas Authority has approved EnQuest’s development plan for the Scolty/Crathes fields in the UK central North Sea. The estimated cost is $125 million.

EnQuest plans single horizontal wells on each fields tied back to the Kittiwake platform in the Greater Kittiwake Area (GKA). Development drilling should start by mid-2016 followed by first oil during the first half of 2017, with peak volumes of 20,000 boe/d.

Production from Scolty/Crathes should continue until 2025.

The cost of the tieback and the work required on the platform topsides have been agreed on a fixed lump-sum turnkey basis, payable after a first oil-determined date.

This year the company has continued measures to improve production efficiency from the GKA, which was previously operated by Centrica. A redundant production well on the Gadwall field was successfully side tracked to an updip location and brought onstream in August.

At Goosander, chemical treatment has raised production levels substantially. By end-November, total GKA production was more than three times the level generated during 2014.

In late October, EnQuest delivered first oil from its Alma/Galia development project, also in the central sector, initially via two wells on the Alma field (K3Z and K5) equipped with electrical submersible pumps (ESPs). The Galia well came online in mid-November.

EnQuest expects to attain peak production from Alma/Galia before the end of 1Q 2016, after a brief shutdown to implement a switch to power generated from the steam turbine generators and also to commission the remaining subsea facilities.

Thereafter, six producer wells will be available for production and one water injector.

At the EnQuest-operated Thistle/Deveron complex in the UK northern North Sea, an additional production well (A62/53) was placed on production in August. At the same time, an ESP workover was completed on well A59/45, followed by restoration to production.

Due to the strong performance of the drilling program, two wells planned for 2016 were brought forward: well A64/40 was drilled in the crest of the Western Fault block and put online in October, followed by completion of the Deveron A63/07 well with a dual ESP, and put online in November.

During the current quarter, the Thistle/Deveron work program has been extended to include a workover of Deveron A58 to replace and upgrade the ESPs, and an infill producer in the Southern Fault block of Thistle (SFB-P2).

At Heather/Broom in the same region, reinstatement earlier this year of water injection at the satellite Broom field has led to increased oil production.

As for the ongoing heavy-oil Kraken development in the East Shetland basin, the submerged turret/buoy for the FPSO was transported to the field and installed. Drill center 1 (DC1) was then connected to the turret/buoy, with only one production riser still to be connected from the second drill center. 

Following the completion of the Kraken batch top-hole drilling program at DC1, the rig has been engaged in pre-drilling of individual wells into the reservoir and is currently ahead of schedule.

Reservoir analysis of the two full well penetrations to date appears to match the subsurface prognosis. Procurement, manufacture, and installation continue for the next phases of wells, subsea infrastructure, and the FPSO.

EnQuest has relinquished other UK license interests as a result of the oil price decline, and has also completed the disposal of its Norwegian North Sea interests.


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