35/11-14 S

Exploration · Appraisal · P&A · Oil/gas · Norsk Hydro Petroleum AS · Byrding · PL 090 B

35/11-14 S is an appraisal exploration wellbore in the North Sea, drilled by Norsk Hydro Petroleum AS, entered Aug 23, 2006, to 3,306 m in the Heather Fm.

Discovery 35/11-13 Byrding · On the map →

3,306: m total depth · 3,285.5 m vertical
361: m water depth
Aug 23, 2006: entered · completed Dec 7, 2006
Heather Fm: at total depth · Late Jurassic
53.3: m of core in 2 cores
122: °C bottom-hole temperature

SODIR FACTPAGES · RECORD UPDATED NOV 4, 2026 · RELEASED DEC 7, 2008

On file for this wellbore

What the Directorate holds from this wellbore. Each opens the section that lists it.

Drilling

Drilling facility: TRANSOCEAN WINNER · Semisub steel
Drilling days: 107
Kelly bushing elevation: 26 m
Maximum inclination: 16.5°
Drilling permit: 1119-L
Licensing round: 8
Plugged and abandoned: —
Core samples available: Yes
Cuttings samples available: Yes
Position · ED50: 61.15067° N, 3.54771° E
Hydrocarbons in: Intra Heather Fm Ss · Late Jurassic

Well history

WRITTEN BY THE NORWEGIAN OFFSHORE DIRECTORATE

General

Well 35/11-14 S is an appraisal well on the B-segment of the Astero discovery in PL090B. The Astero prospect is located north of the Fram West field, in the northern part of the 35/11-block. The target was Intra Heather Formation turbidite sandstones of Middle Oxfordian age derived from the Sognefjord delta in the East. The primary objectives were to test the presence and type of hydrocarbons in the Oxfordian sands, and assess reservoir quality, hydrocarbon column heights and regional pressure communication. Samples of all fluids were to be obtained. The TD criterion was to drill 100 m below base of the Intra Heather Formation reservoir section.

Operations and results

Well 35/11-14 S was spudded with the semi-submersible installation Transocean Winner on 23 August 2006 and drilled to TD at 3306 m (3285.6 m TVD RKB) in the Late Jurassic Heather Formation. After drilling into Pliocene sands at 693 m the well started to flow. The well was then displaced to 1.5 SG kill mud. It was discovered that mud motor and 26" bit had been twisted off and left in the hole. The well was cemented back to 30" casing shoe and technically side tracked from 500 m. A new 26" section was drilled to 641 m. The well was drilled as a deviated hole, but close to vertical through the reservoir section. It was drilled with spud mud down to 640 m and with Glydril (2 - 4.5% glycol) from 640 m to TD.

The well was drilled within the fault bounded dip closure, shallow on the structure. The Intra Heather Formation sands (Oxfordian turbidites) were encountered as prognosed at 3103 - 3215 m (3083 - 3195 m TVD RKB). They contained commercial hydrocarbons with a gas oil contact at 3106.5 m (3086.5 m TVD RKB), and an oil water contact (Free Water Level) at 3126.0 m (3106 m TVD RKB). Good oil shows were observed down to 3158 m.

Two cores were cut from 3110 to 3164 m. They comprised mainly sandstones with occasional thin siltstones. The reserv

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About this data

Norwegian Offshore Directorate (Sodir) FactPages, mirrored nightly and used under the Norwegian Licence for Open Government Data (NLOD). Depths are metres along the wellbore from the kelly bushing unless a row gives its own unit; older cores are filed in feet. A zero the Directorate files for an unmeasured pressure, density, or temperature is shown as a dash.

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