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Generated 11.02.2012 |
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| NPDID wellbore: | 3524 | |
| Well name: | 35/9-4 | |
| Drilling operator name: | Norsk Hydro Produksjon AS | |
| Geodetic datum: | ED50 | |
| Coordinates: | 61° 19` 32.50`` N | 3° 57` 55.23`` E |
| UTM coordinates: | 6799609.42 N | 551677.16 E |
| UTM zone: | 31 | |
| Drilled in production licence: | 153 | |
| Area: | NORTH SEA | |
| Discovery: | 35/9-2 | |
| Field: | GJØA | |
| Drill permit: | 930-L | |
| Drilling facility: | TRANSOCEAN LEADER | |
| Drilling days: | 32 | |
| Wellbore entry date: | 13.07.1998 | |
| Wellbore completion date: | 13.08.1998 | |
| Original wellbore purpose: | APPRAISAL | |
| Wellbore purpose: | APPRAISAL | |
| Wellbore status: | P&A | |
| Wellbore contents: | DRY | |
| Discovery wellbore: | NO | |
| Seismic location: | NH 9301-inline 1156 & x-line 1642 | |
| Kelly bushing elevation (KB) [m]: | 24 | |
| Water depth [m]: | 364 | |
| Total Depth (MD) [m]: | 1261 | |
| Final vertical depth (TVD) [m]: | 1261 | |
| Max inclination [°]: | ||
| Bottom hole temperature [°C]: | ||
| Oldest penetrated age: | PALEOCENE | |
| Oldest penetrated formation: | LISTA FM | |
| Note: All depths, except the water depth, are relative to kelly bushing (RKB) | ||
General
Well 35/9-4 S was the sixth exploration well in the license and should appraise the hydrocarbon potential of the A South structure on the Gj øa Discovery. The primary target was sands of the Sognefjord and Fensfjord Formations, which were expected to be in full internal communication and with common fluid contacts.
Operations and results
Well 35/9-4 S was spudded with the semi-submersible installation Transocean Leader on 13 July 1998 and drilled to TD at 1261 m in the Paleocene Lista Formation. A 36" hole was drilled to 451 m, and the 30" conductor set at 449 m. The 17 1/2" hole section was drilled riserless to 1261 m. During running of the 13 3/8" casing, water flow was observed in the wellhead area. The casing was set at 1255.5 m, and the riser and BOP were installed. The water flow increased in magnitude and amount, and a successful killing operation was carried out. The well was drilled with seawater and hi-vis pills from top to TD.
The well objective was not fulfilled as the well was terminated due to the shallow water flow. The source of the shallow water flow was found to be a quaternary sand-rich interval between 559 m and 600 m, and with a significant contribution from an intra Lista Formation sand at 903 m. No cores were cut and no fluid samples taken in the well.
The well was permanently abandoned on 12 August 1998 as a dry well.
Testing
No drill stem test was performed
No cuttings in this wellbore.
No cores in this wellbore.
No scanned core photos available
No palynological slides in this wellbore.
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 | 449.0 | 36 | 451.0 | |
| SURF.COND. | 13 3/8 | 1255.0 | 17 1/2 | 1261.0 |
| Depth MD [m] | Mud weight [g/cm3] | Visc. [MPa.s] | Yield [pnt Pa.] | Mud type | Date measured |
|---|---|---|---|---|---|
| 445 | 1.60 | 18.0 | WATER BASED | ||
| 451 | 1.03 | WATER BASED | |||
| 460 | 1.60 | 18.0 | WATER BASED | ||
| 510 | 2.04 | 16.0 | WATER BASED | ||
| 1261 | 1.60 | 18.0 | WATER BASED |
No drill stem test in this wellbore.
| Log type | Intervals logged [m] |
|---|---|
| MWD - GR RES DIR | 389 - 1261 |
| CBL VDL GR | 389 - 1254 |
| TDT | 389 - 1254 |
| TEMPERATURE | 389 - 1261 |
| Top depth [m] | Litostratigraphic unit |
|---|---|
| 388 | NORDLAND GP |
| 559 | HORDALAND GP |
| 605 | ROGALAND GP |
| 605 | BALDER FM |
| 642 | SELE FM |
| 723 | LISTA FM |
| 832 | NO FORMAL NAME |
| 843 | LISTA FM |
| 875 | NO FORMAL NAME |
| 987 | LISTA FM |
No composite log presently available.
No geochemical data presently available. Regional geochemical studies which include data from this well may however be filed on a different well.
No documents presently available.
