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Generated 08.02.2012 |
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| NPDID wellbore: | 2830 | |
| Well name: | 33/9-19 | |
| Drilling operator name: | Den norske stats oljeselskap a.s | |
| Geodetic datum: | ED50 | |
| Coordinates: | 61° 28` 33.56`` N | 1° 59` 50.60`` E |
| UTM coordinates: | 6816380.31 N | 446585.05 E |
| UTM zone: | 31 | |
| Drilled in production licence: | 037 | |
| Area: | NORTH SEA | |
| Discovery: | 33/9-19 S SYGNA | |
| Field: | SYGNA | |
| Drill permit: | 848-L | |
| Drilling facility: | TRANS. WILDCAT | |
| Drilling days: | 25 | |
| Wellbore entry date: | 29.06.1996 | |
| Wellbore completion date: | 23.07.1996 | |
| Original wellbore purpose: | APPRAISAL | |
| Wellbore purpose: | WILDCAT | |
| Wellbore status: | P&A | |
| Wellbore contents: | OIL | |
| Discovery wellbore: | YES | |
| Formation/age with hydrocarbons 1: | ETIVE FM / MIDDLE JURASSIC | |
| Formation/age with hydrocarbons 2: | RANNOCH FM / MIDDLE JURASSIC | |
| Seismic location: | E 86 REPR. 93 INLINE 620& CROSSL. 990 | |
| Kelly bushing elevation (KB) [m]: | 25 | |
| Water depth [m]: | 304 | |
| Total Depth (MD) [m]: | 3197 | |
| Final vertical depth (TVD) [m]: | 3061 | |
| Max inclination [°]: | ||
| Bottom hole temperature [°C]: | ||
| Oldest penetrated age: | EARLY JURASSIC | |
| Oldest penetrated formation: | STATFJORD FM | |
| Note: All depths, except the water depth, are relative to kelly bushing (RKB) | ||
General
Well 33/9-19 S is situated in the Tampen Spur area. The well 33/9-19 S was drilled to the Statfjord Nord Nordøst Segment (SFNN&S) of the Statfjord Field. The segment lies at the north-eastern extension of the Statfjord North Field structure in both blocks 33/9 and 34/17. Well 33/9-19 S was an exploration well designed to prove the most likely oil water contact in Brent Group in the previously undrilled Statfjord Nord Nordøst Segment (SFNN&S).
Operations and results
The 33/9-19 S well was spudded on the 29 of June 1996, using the semi-submersible installation "Transocean Wildcat". The well was drilled in a north-western direction to TD at 3197 m in the Early Jurassic Statfjord Formation.& The pilot hole was drilled with bentonite mud. The 36" and 17 1/2" sections were drilled with sea water and swept clean with bentonite mud. The 12 1/4" hole section was drilled with Ancho-2000 mud and the 8 1/2" hole section was drilled with Ancovert Oil based mud. No shallow gas was recorded.
Schlumberger ran logs on wireline run no. 2B after having fished the Supercombo tool at TD due to a cable-socket broke when pulling up to high and into upper sheave. RFT points were taken with a MDT tool in run no. 2A. Only two MDT samples were recovered from depth 2701 m (6 bottles of 450ml was empty).
The target Base Cretaceous/Top Brent was reached at 2689.0 m (2646.8 m TVD RKB), 28 m shallower than prognosed. One 90 ft core was cut from 2709 & 2727 m (100% recovery). The core jammed off after 18 m during coring of a calcite cemented sandstone interval. The core consisted of 100% RC filled Brent Group sandstone. Drilling continued towards the planned TD in Dunlin Group with an inclination of 35&. After having reached this TD, it was decided to continue drilling in order to investigate the Statfjord Formation reservoir characteristics and to improve the mapping of the Brent and Dunlin Groups. The inclination stayed at approximately 29.5& to final TD at 3197 m (3061.5 m TVD RKB). Top Statfjord Formation, which was water wet, came in at 3122 m (2996 m TVD RKB), 19 m TVD shallower than prognosed.
The well 33/9-19 A was plugged as an oil discovery on 23 July 1996.
Testing
No drill stem test was performed
Interval [m]: 780.00 - 3197.00
Core length [m]: 18.10
| Core number | Interval |
|---|---|
| 1 | 2709.00-2727.15 |
 2709-2714m |
 2714-2719m |
 2719-2714m |
 2724-2727m |
No oil samples available.
| Type | Casing diam. [inch] | Depth below KB [m] | Hole diam. [inch] | Hole depth below KB [m] | Lot mud eqv. [g/cm3] |
|---|---|---|---|---|---|
| CONDUCTOR | 30 | 390.0 | 36 | 392.0 | |
| INTERM. | 13 3/8 | 758.0 | 17 1/2 | 760.0 | 1.58 |
| INTERM. | 9 5/8 | 1951.0 | 12 1/4 | 1953.0 | 1.85 |
| OPEN HOLE | 3197.0 | 8 1/2 | 3197.0 |
| Depth MD [m] | Mud weight [g/cm3] | Visc. [MPa.s] | Yield [pnt Pa.] | Mud type | Date measured |
|---|---|---|---|---|---|
| 450 | 1.03 | DUMMY | |||
| 1220 | 1.22 | DUMMY | |||
| 1900 | 1.50 | DUMMY | |||
| 1956 | 1.50 | 24.0 | ANCO 2000 | ||
| 2305 | 1.62 | 40.0 | ANCO VERT | ||
| 2709 | 1.62 | 42.0 | ANCO VERT | ||
| 3197 | 1.62 | 39.0 | ANCO VERT |
No drill stem test in this wellbore.
| Log type | Intervals logged [m] |
|---|---|
| MWD - DPR II | 329 - 3197 |
| LDL CNL GR AMS | 1951 - 3165 |
| MDT GR | 2692 - 2797 |
| AS GR AMS | 1951 - 3192 |
| DIL GR AMS | 1951 - 3185 |
| VSP | 832 - 2635 |
| Top depth [m] | Litostratigraphic unit |
|---|---|
| 328 | NORDLAND GP |
| 960 | UTSIRA FM |
| 1131 | HORDALAND GP |
| 1681 | ROGALAND GP |
| 1681 | BALDER FM |
| 1714 | LISTA FM |
| 1869 | SHETLAND GP |
| 1869 | JORSALFARE FM |
| 2237 | KYRRE FM |
| 2678 | CROMER KNOLL GP |
| 2678 | MIME FM |
| 2689 | BRENT GP |
| 2689 | ETIVE FM |
| 2742 | RANNOCH FM |
| 2845 | DUNLIN GP |
| 2845 | DRAKE FM |
| 2939 | COOK FM |
| 2975 | BURTON FM |
| 3027 | AMUNDSEN FM |
| 3122 | NO GROUP DEFINED |
| 3122 | STATFJORD FM |
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