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Exploration wellbore: 2/1-9 A

General information

Wellbore history

General

Well 2/1 &9 A was drilled to appraise the 2/1-9 discovery in the Late Jurassic "Gyda sandstone member" (Ula Formation), by side-tracking up-dip to the crest of the Gyda South structure. If successful, the well could at a later stage be completed as a producer and tie back to Gyda platform. The structure is a fault/dip closure, which lies in the Late Jurassic fairway on the eastern flank of the Central Graben, 6 kilometres south of the Gyda field in the North Sea.

Operations and results

Well 2/1-9 was re-entered on 18 January 1992 by the semi submersible installation Ross Isle. The appraisal sidetrack well 2/1-9 A was kicked off in the 8 1/2" hole from 3270 m in the Late Cretaceous Tor Formation and drilled to TD 4379 m in the Late Jurassic Ula Formation. It took 25 1/2 days (18 1/2 days longer than planned) to drill to coring point at 4140 m. This delay was mainly due to difficulties in controlling the directional tendencies of the BHA's, which required a number of correction runs. In addition, poor bit performance and harder than expected formations exacerbated the slow progress. Hole inclination was 52.8 degrees at coring point. Problems were also experienced during TD logging with stuck logging tools and stuck pipe whilst attempting to retrieve the tool. In addition a 9 bbl influx had to be circulated out during this time. The well was drilled with Novamul ether-based mud from kick-off to TD.

The target Ula Formation sandstone was encountered at 4099 m (3966 m TVD RKB). It was 120 m thick (TVD) and oil-bearing all through. The logs observed no OWC.

Six cores (178 m) were cut in the 8 1/2" hole. All cores had 100% recovery with excellent shows being observed throughout. Core 1 to 5 covered the sandstone of the Ula Formation while core 6 entered into a mud stone member at the base. No H2S was observed whilst coring -despite having high level contingency due to H2S seen on well 2/1-9. The RFT was run and pressure points were recorded, but no fluid samples were taken.

The well was suspended on 8 March 1983 as a potential future Gyda sub sea producer.

Testing

No drill stem test was performed.

Cuttings available at the NPD

Interval [m]: 3280.00 - 4379.00

Cores available at the NPD

Core length [m]: 177.50

Scanned core photos

4141-4146m	4146-4151m	4151-4156m	4156-4161m	4161-4166m
4166-4171m	4171-4176m	4176-4178m	4178-4183m	4183-4188m
4188-4193m	4193-4198m	4198-4203m	4203-4208m	4208-4213m
4213-4218m	4218-4223m	4223-4224m	4223-4228m	4228-4233m
4233-4238m	4238-4243m	4243-4248m	4248-4251m	4251-4256m
4256-4261m	4261-4266m	4266-4271m	4271-4276m	4276-4279m
4279-4284m	4284-4289m	4289-4294m	4294-4299m	4299-4304m
4304-4307m	4307-4312m	4312-3217m	4317-4319m

Palynological slides available at the NPD

No palynological slides in this wellbore.

Oil samples available at the NPD

No oil samples available.

Casing and leak-off tests

Mud

Drill stem test

No drill stem test in this wellbore.

Available logs

Lithostratigraphy

Composite log

No composite log presently available.

Geochemical information available at the NPD

No geochemical data presently available. Regional geochemical studies which include data from this well may however be filed on a different well.

Documents reported by the licencees (period for duty of secrecy expired)

No documents presently available.

Old NPD WDSS reports, NPD papers and other related documents

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