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Generated 11.02.2012 |
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| NPDID wellbore: | 5779 | |
| Well name: | 1/3-10 | |
| Drilling operator name: | DONG E&P Norge AS | |
| Geodetic datum: | ED50 | |
| Coordinates: | 56° 55` 39.83`` N | 2° 42` 20.61`` E |
| UTM coordinates: | 6309521.02 N | 482087.93 E |
| UTM zone: | 31 | |
| Drilled in production licence: | 274 | |
| Area: | NORTH SEA | |
| Discovery: | 1/3-6 OSELVAR | |
| Field: | OSELVAR | |
| Drill permit: | 1168-L | |
| Drilling facility: | MÆRSK GUARDIAN | |
| Drilling days: | 38 | |
| Wellbore entry date: | 07.01.2008 | |
| Wellbore completion date: | 13.02.2008 | |
| Original wellbore purpose: | APPRAISAL | |
| Wellbore purpose: | APPRAISAL | |
| Wellbore status: | P&A | |
| Wellbore contents: | OIL/GAS | |
| Discovery wellbore: | NO | |
| Formation/age with hydrocarbons 1: | FORTIES FM / PALEOCENE | |
| Seismic location: | BPN 9202 R02 3D dataset inline 904 & crossline 3018 | |
| Kelly bushing elevation (KB) [m]: | 45 | |
| Water depth [m]: | 72 | |
| Total Depth (MD) [m]: | 3632 | |
| Final vertical depth (TVD) [m]: | 3335 | |
| Max inclination [°]: | 53.80 | |
| Bottom hole temperature [°C]: | 145 | |
| Oldest penetrated age: | PALEOCENE | |
| Oldest penetrated formation: | SELE FM | |
| Note: All depths, except the water depth, are relative to kelly bushing (RKB) | ||
General
Well 1/3-10 A is located on the Hidra High, ca 20 km south-south west of the Ula Field in the North Sea. It was drilled to further appraise the Forties Formation Sandstone in the Oselvar structure, after the primary well 1/3-10 had confirmed oil and gas in the structure. The main goal of the sidetrack well was to penetrate the water leg for water sampling and establish the free water level in the structure.
Operations and results
The Oselvar 1/3-10 A appraisal sidetrack kicked off in the claystones of the Hordaland Group at 2276 m on 7 January 2008. It was drilled with the jack-up installation Mærsk Guardian to final TD at 3632 m in the lower part of the Sele Formation below the target Forties Sandstone. The well was drilled without significant technical problems. It was drilled with Carbo SEA OBM from kick-off to TD.
The well track penetrated the remaining Hordaland claystone, and the claystones, tuffaceous claystones and sandstones of the Rogaland Group (Paleocene-Eocene), which included the Balder Formation, the Sele Formation, and the target Forties Sandstone Member. The top of the Balder Formation came in only 1 m TVD shallow compared to prognosis, the Sele Formation came in deep (10 m TVD) compared to prognosis. The Forties Sandstone came in at 3516 m (3257 m TVD RKB), 11 m TVD compared to prognosis. The log data confirmed that the well had penetrated the water leg of the reservoir as expected, and indicated 64 m MD (43 m TVD) gross reservoir and a net reservoir of 37 m MD (25 m TVD), giving a Net/Gross of 0.58. The net reservoir, all of which is considered to be non-pay, has an average porosity of 18 % and mobilities in the range 1-13 mD/cP. Pressure measurements indicated a free water level at 3245 m TVD RKB.
From petrophysical evaluation the water bearing reservoir was found to contain residual hydrocarbons. The only oil show in the well was a weak oil stain at 3525 m (3263 m TVD RKB) in the Forties Formation.
No cores were cut in 1/3-10 A. An RCI log was run for pressure and fluid sampling.Water samples were taken at 3556 m, 3572 m, and 3536.75 m.
The well was permanently abandoned on 13 January 2008 as an oil and gas appraisal well.
Testing
No DST was carried out
Interval [m]: 2310.00 - 3631.80
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] |
|---|---|---|---|---|---|
| OPEN HOLE | 2276.0 | 8 1/2 | 3632.0 | 1.90 |
No mud data available.
No drill stem test in this wellbore.
| Log type | Intervals logged [m] |
|---|---|
| MWD LWD - PWD DGR EWR ALD CTN... | 2282 - 3126 |
| MWD LWD - ...PCDC BAT | 2283 - 3126 |
| MWD LWD - EWR DGR PWD ALD CTN... | 3126 - 3632 |
| MWD LWD - ...PCDC BAT | 3126 - 3632 |
| RCI | 3495 - 3577 |
| DSL | 2145 - 3569 |
| ZDL DSL | 2193 - 3616 |
| Top depth [m] | Litostratigraphic unit |
|---|---|
| 117 | NORDLAND GP |
| 1685 | HORDALAND GP |
| 3320 | ROGALAND GP |
| 3320 | BALDER FM |
| 3348 | SELE FM |
| 3516 | FORTIES FM |
| 3580 | SELE 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.
