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Generated 11.02.2012 |
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| NPDID wellbore: | 1794 | |
| Well name: | 36/7-1 | |
| Drilling operator name: | Norsk Hydro Produksjon AS | |
| Geodetic datum: | ED50 | |
| Coordinates: | 61° 21` 13.49`` N | 4° 0` 57.22`` E |
| UTM coordinates: | 6802775.15 N | 554334.61 E |
| UTM zone: | 31 | |
| Drilled in production licence: | 153 | |
| Area: | NORTH SEA | |
| Discovery: | 36/7-1 | |
| Field: | GJØA | |
| Drill permit: | 842-L | |
| Drilling facility: | WEST VANGUARD | |
| Drilling days: | 38 | |
| Wellbore entry date: | 31.03.1996 | |
| Wellbore completion date: | 07.05.1996 | |
| Original wellbore purpose: | WILDCAT | |
| Wellbore purpose: | WILDCAT | |
| Wellbore status: | P&A | |
| Wellbore contents: | OIL/GAS | |
| Discovery wellbore: | YES | |
| Formation/age with hydrocarbons 1: | INTRA DRAUPNE FM SS / LATE JURASSIC | |
| Formation/age with hydrocarbons 2: | SOGNEFJORD FM / LATE JURASSIC | |
| Formation/age with hydrocarbons 3: | FENSFJORD FM / MIDDLE JURASSIC | |
| Seismic location: | NH 8902-INLINE 928 & CROSSLINE 900 | |
| Kelly bushing elevation (KB) [m]: | 22 | |
| Water depth [m]: | 358 | |
| Total Depth (MD) [m]: | 2841 | |
| Final vertical depth (TVD) [m]: | 2839 | |
| Max inclination [°]: | 8.80 | |
| Bottom hole temperature [°C]: | 81 | |
| Oldest penetrated age: | PRE-DEVONIAN | |
| Oldest penetrated formation: | BASEMENT | |
| Note: All depths, except the water depth, are relative to kelly bushing (RKB) | ||
General
Well 36/7-1 is located on the Måløy slope, ca 4 km SE of the 35/9-1 Gjøa Discovery well. It was the third exploration well to be drilled in the licence area and tested the hydrocarbon potential of the A-East structure. The primary target was the transgressive sands of the Sognefjord and Fensfjord formations. Brent Group sandstone was secondary target.
Operations and results
Wildcat well 36/7-1 was spudded with the semi-submersible installation West Vanguard on 31 March 1996 and drilled to TD at 2841 m in basement rock. No significant technical problems were encountered in the operations. The well was drilled with seawater and hi-vis sweeps (spud mud) mud down to 1256 m and with ANCO 2000 mud from 1256 m to TD.
The well discovered oil and gas in Intra Draupne sandstones and the Sognefjord Formations of Late Jurassic age as well as in middle jurassic Fensfjord Formation. The Brent Group was dry. The reservoir consists of sandstone, siltstone and shale. The free oil and free water levels were clearly defined from the MDT pressure data and were consistent with the fluid contacts apparent from the logs. The FOL was at 2337.6 m (2315.0 m TVD MSL), and the FWL was at 2372.1 m, (2349.5 m TVD MSL). Proven gross gas column was 217 m (2120 -2337 m) and proven gross oil column was 34.5 m (2337 - 2371.5 m). Reported oil shows began at 1910 m and ended at 2429 m. Evaluation of MDT data from well 36/7-1 showed the same pressure environment within the oil zone of the Fensfjord Formation as in the wells 36/7-1 and 35/9-2.
A total of 280 m core was retrieved in nine cores from the interval 2124 m to 2429.5 m in the Sognefjord and Fensfjord Formations. MDT sampling was performed at 2443.5 m in the water zone.
The well was permanently abandoned on 7 May 1996 as an oil and gas discovery.
Testing
A successful production test was performed in an approximately 12 m thick sandstone layer within the oil zone (2362.9 - 2367.9 m). Production was 1025 Sm3 /day on a 64/64 choke. The fluid contained 0.15% CO2 and the gas/oil ratio was 166 Sm3/Sm3. The oil density was 0.82 g/cm3. No water was produced.
Interval [m]: 1260.00 - 2842.00
Core length [m]: 280.80
| Core number | Interval |
|---|---|
| 1 | 2124.00-2142.90 |
| 2 | 2143.00-2169.74 |
| 3 | 2171.00-2199.00 |
| 4 | 2199.00-2226.80 |
| 5 | 2247.00-2272.85 |
| 6 | 2275.00-2308.30 |
| 7 | 2309.00-2345.60 |
| 8 | 2346.00-2383.10 |
| 9 | 2383.00-2429.50 |
 2124-2129m |
 2129-2134m |
 2134-2139m |
 2139-2142m |
 2143-2148m |
 2148-2153m |
 2153-2158m |
 2158-2163m |
 2163-2168m |
 2168-2169m |
 2171-2176m |
 2176-2181m |
 2181-2186m |
 2186-2191m |
 2191-2196m |
 2196-2199m |
 2199-2204m |
 2204-2209m |
 2209-2214m |
 2214-2219m |
 2219-2224m |
 2224-2226m |
 2247-2252m |
 2252-2257m |
 2257-2262m |
 2262-2267m |
 2267-2272m |
 2272-2273m |
 2275-2280m |
 2280-2285m |
 2285-2290m |
 2290-2295m |
 2295-2300m |
 2305-2308m |
 2309-2314m |
 2314-2319m |
 2319-2324m |
 2324-2329m |
 2329-2334m |
 2334-2339m |
 2339-2344m |
 2344-2345m |
 2346-2351m |
 2151-2356m |
 2356-2361m |
 2361-2366m |
 2366-2371m |
 2371-2376m |
 2376-2381m |
 2381-2383m |
 2383-2388m |
 2388-2393m |
 2393-2398m |
 2398-2403m |
 2403-2408m |
 2408-2413m |
 2413-2418m |
 2418-2423m |
 2423-2428m |
 2428-2430m |
| Test type: | Bottle test number: | Bottle interval [m]: | Fluid type: | Test date and time: |
|---|---|---|---|---|
| DST | DST1 | 2363.000 - 2368.000 | 1996.05.01 00:07 |
| Type | Casing diam. [inch] | Depth below KB [m] | Hole diam. [inch] | Hole depth below KB [m] | Lot mud eqv. [g/cm3] |
|---|---|---|---|---|---|
| CONDUCTOR | 30 | 440.0 | 36 | 440.0 | |
| SURF.COND. | 13 3/8 | 1251.0 | 17 1/2 | 1251.0 | 1.46 |
| OPEN HOLE | 2124.0 | 12 1/4 | 2124.0 | ||
| OPEN HOLE | 2841.0 | 8 1/2 | 2841.0 |
| Depth MD [m] | Mud weight [g/cm3] | Visc. [MPa.s] | Yield [pnt Pa.] | Mud type | Date measured |
|---|---|---|---|---|---|
| 440 | 1.20 | WATER BASED | |||
| 979 | 1.05 | WATER BASED | |||
| 1256 | 1.20 | 8.0 | WATER BASED | ||
| 2142 | 1.20 | 12.0 | WATER BASED | ||
| 2305 | 1.23 | 16.0 | WATER BASED | ||
| 2777 | 1.20 | 15.0 | WATER BASED | ||
| 2832 | 1.21 | 22.0 | WATER BASED | ||
| 2841 | 1.21 | 23.0 | WATER BASED |
| Test no. | Test interval [m] | Choke size [mm] | Final shut in pressure [MPa] | Final flow pressure [MPa] | Bottom hole pressure [MPa] | Downhole temperature [°C] |
|---|---|---|---|---|---|---|
| 1.0 | 2362 - 2367 | 25.4 | 24.000 | 22.000 | 24.000 | 0 |
| Test no. | Oil [Sm3/day] | Gas [Sm3/day] | Oil grav. [g/cm3] | Gas grav. rel.air | GOR [m3/m3] |
|---|---|---|---|---|---|
| 1.0 | 1025 | 171175 | .820 | .800 | 167 |
| Log type | Intervals logged [m] |
|---|---|
| MWD - GR RES DIR | 380 - 2841 |
| DLL MSFL SDT LDL CNL GR AMS | 1253 - 2835 |
| MDT GR ACTS | 2135 - 2778 |
| FMI NGT AMS | 1253 - 2834 |
| MDT GR | 2443 - |
| VSP | 1035 - 2820 |
| CST GR | 1287 - 2116 |
| Top depth [m] | Litostratigraphic unit |
|---|---|
| 380 | NORDLAND GP |
| 608 | ROGALAND GP |
| 1281 | SHETLAND GP |
| 1281 | JORSALFARE FM |
| 1323 | KYRRE FM |
| 1958 | BLODØKS FM |
| 1976 | SVARTE FM |
| 2020 | CROMER KNOLL GP |
| 2020 | RØDBY FM |
| 2046 | ÅSGARD FM |
| 2120 | VIKING GP |
| 2120 | INTRA DRAUPNE FM SS |
| 2171 | SOGNEFJORD FM |
| 2207 | HEATHER FM |
| 2235 | FENSFJORD FM |
| 2510 | KROSSFJORD FM |
| 2560 | HEATHER FM |
| 2662 | BRENT GP |
| 2662 | NESS FM |
| 2700 | ETIVE FM |
| 2727 | RANNOCH FM |
| 2770 | DUNLIN GP |
| 2808 | NO GROUP DEFINED |
| 2808 | STATFJORD FM |
| 2834 | BASEMENT |
No composite log presently available.
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