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Generated 11.02.2012 |
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| NPDID wellbore: | 2886 | |
| Well name: | 30/5-2 | |
| Drilling operator name: | Norsk Hydro Produksjon AS | |
| Geodetic datum: | ED50 | |
| Coordinates: | 60° 30` 16.30`` N | 2° 38` 12.71`` E |
| UTM coordinates: | 6707814.40 N | 480053.38 E |
| UTM zone: | 31 | |
| Drilled in production licence: | 034 | |
| Area: | NORTH SEA | |
| Discovery: | 30/8-1 SR TUNE | |
| Field: | TUNE | |
| Drill permit: | 861-L | |
| Drilling facility: | TREASURE SAGA | |
| Drilling days: | 79 | |
| Wellbore entry date: | 04.10.1996 | |
| Wellbore completion date: | 21.12.1996 | |
| Original wellbore purpose: | APPRAISAL | |
| Wellbore purpose: | APPRAISAL | |
| Wellbore status: | P&A | |
| Wellbore contents: | OIL/GAS | |
| Discovery wellbore: | NO | |
| Formation/age with hydrocarbons 1: | BRENT GP / MIDDLE JURASSIC | |
| Seismic location: | SH 9106- INLINE 445 & CROSSLINE 177 | |
| Kelly bushing elevation (KB) [m]: | 26 | |
| Water depth [m]: | 92 | |
| Total Depth (MD) [m]: | 4076 | |
| Final vertical depth (TVD) [m]: | 4075 | |
| Max inclination [°]: | 3.00 | |
| Bottom hole temperature [°C]: | 139 | |
| Oldest penetrated age: | EARLY JURASSIC | |
| Oldest penetrated formation: | DRAKE FM | |
| Note: All depths, except the water depth, are relative to kelly bushing (RKB) | ||
Well 30/5-2 is located a few km west of the Oseberg Field in the Northern North Sea. It was drilled on the northern and down dip extension of the hydrocarbon accumulation discovered by well 30/8-1 S. The main target was the Brent deltaic sands of the Tarbert Formations. The primary objectives were to prove filling level and hydrocarbon types in a down dip (northern) direction, and to prove pressure communication and continuity with the reservoirs in 30/8-1 S. Planned TD was 50 m into the Dunlin Group.
Operations and results
Appraisal well 30/5-2 was spudded with the semi-submersible installation Treasure Saga on 4 October 1996 and drilled to TD at 4076 m in the Early Jurassic Drake Formation. The total duration of the well was some 20 days behind schedule. The main contribution to this was time spent to cure a shallow gas source, corrective measures in conjunction with a 13 3/8" casing hanger sitting high and a stuck MDT tool. The well was drilled with spud mud and bentonite down to 1558 m, with KCl/polymer mud from 1558 m to TD.
The main reservoir interval consisted of the Tarbert Formation, but the Ness and ORE Formations were also encountered. Gas and oil pay was interpreted below 3528.5 m in the "Tarbert 2" reservoir, approximately 58 m and 10 m respectively. The well interpretation concludes with a GDT (gas down to) situation at 3591.5 m in the Tarbert 2 reservoir and with an OUT (oil up to) at 3602 m. An OWC is indicated at 3614 m with a FWL (free water level) at about 3616.5 m. In the Ness Formation a total of 16 m pay was interpreted in channel sands. The assumed fluid in these sands is gas, but this was not conclusively proven. The ORE (Oseberg - Rannoch - Etive) Formation had 1.4 m pay interpreted, but this may be an optimistic result as it was equally likely that this could represent so-called residual hydrocarbons. The reservoir properties are considered fairly modest with porosities generally below 20 % and with core permeabilities generally in the range 1 to 100 mD. The best properties, based on MDT mobility, were found in the Tarbert 2 gas reservoir and in the water bearing Ness sand at 3720 - 3740 m.
Three cores were cut in the Tarbert Formation from 3531 to 3632.35 m.
The well was permanently abandoned on 21 December 1996 as an oil and gas appraisal well.
Testing
Three drill stem tests were performed. DST IA tested the water zone in the interval 3623.3 - 3627.8 m. It produced water at a rate of 30 m3 /day. DST IB tested the intervals 3623.3 - 3627.8 m + 3601.3 - 3621.3 m. In the main flow, using a 32/64" choke, it produced 250 m3 water, 135 Sm3 oil, and 63000 Sm3 gas /day. The GOR was 470 Sm3/Sm3, the oil density was 0.88 g/cm3 and the gas gravity was 0.79 - 0.82 (air = 1). The initial reservoir temperature measured in this flow was 131.1 deg C. DST II tested the gas zone in the interval 3529.1 - 3591.1 m. At maximum rates in the main flow, using a 72/64" choke, this test produced 980000 Sm3 gas and 510 Sm3 oil /day. No water was produced. The GOR was 1920 Sm3/Sm3, the oil density was 0.83 g/cm3, and the gas gravity was 0.69 (air = 1). The initial reservoir temperature measured in this flow was 127.4 deg C.
Interval [m]: 350.00 - 4075.00
Core length [m]: 100.85
| Core number | Interval |
|---|---|
| 1 | 3531.00-3558.25 |
| 2 | 3558.50-3595.35 |
| 3 | 3595.50-3632.35 |
 3531-3536m |
 3536-3541m |
 3541-3546m |
 3546-3551m |
 3551-3556m |
 3556-3558m |
 3558-3563m |
 3563-3568m |
 3568-3573m |
 3573-3578m |
 3578-3583m |
 3583-3588m |
 3588-3593m |
 3593-3595m |
 3595-3600m |
 3600-3605m |
 3605-3610m |
 3610-3615m |
 3615-3620m |
 3620-3625m |
 3625-3620m |
 3630-3632m |
No palynological slides in this wellbore.
| Test type: | Bottle test number: | Bottle interval [m]: | Fluid type: | Test date and time: |
|---|---|---|---|---|
| DST | DST1B | 3627.800 - 3601.300 | 1996.12.04 00:04 | |
| DST | DST2 | 3591.000 - 3529.000 | 1996.12.10 00:22 |
| Type | Casing diam. [inch] | Depth below KB [m] | Hole diam. [inch] | Hole depth below KB [m] | Lot mud eqv. [g/cm3] |
|---|---|---|---|---|---|
| CONDUCTOR | 30 | 190.0 | 36 | 192.0 | |
| SURF.COND. | 13 3/8 | 1544.0 | 17 1/2 | 1558.0 | |
| INTERM. | 9 5/8 | 3476.0 | 12 1/4 | 3477.0 | |
| LINER | 7 | 4070.0 | 8 1/2 | 4076.0 |
| Depth MD [m] | Mud weight [g/cm3] | Visc. [MPa.s] | Yield [pnt Pa.] | Mud type | Date measured |
|---|---|---|---|---|---|
| 150 | 1.14 | WATER BASED | |||
| 250 | 1.20 | WATER BASED | |||
| 263 | 1.64 | 40.0 | WATER BASED | ||
| 300 | 1.20 | 11.0 | WATER BASED | ||
| 1558 | 1.20 | 18.0 | WATER BASED | ||
| 2513 | 1.41 | 24.0 | WATER BASED | ||
| 3478 | 1.41 | 23.0 | WATER BASED | ||
| 3828 | 1.64 | 34.0 | WATER BASED | ||
| 4076 | 1.64 | 39.0 | WATER BASED | ||
| 4078 | 1.64 | 37.0 | 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 | 3611 - 3624 | 12.5 | 7.000 | 24.000 | 130 | |
| 2.0 | 3566 - 3590 | 11.0 | 36.000 | 127 |
| Test no. | Oil [Sm3/day] | Gas [Sm3/day] | Oil grav. [g/cm3] | Gas grav. rel.air | GOR [m3/m3] |
|---|---|---|---|---|---|
| 1.0 | 135 | 63000 | .880 | .710 | 470 |
| 2.0 | 140 | 300000 | .830 | .690 | 2140 |
| Log type | Intervals logged [m] |
|---|---|
| MWD - GR RES DIR | 118 - 4076 |
| DLL MSFL DSI GR SP ACTS | 3676 - 4075 |
| LDL CNL CMR NGT ACTS | 3476 - 4075 |
| FMI GR ACTS | 3476 - 4063 |
| MRIL GR | 3510 - 3660 |
| MDT GR ACTS | 3529 - 3766 |
| MDT GR AMS | 3566 - 3621 |
| VSP GR | 3000 - 4010 |
| Top depth [m] | Litostratigraphic unit |
|---|---|
| 118 | NORDLAND GP |
| 627 | UTSIRA FM |
| 917 | HORDALAND GP |
| 993 | SKADE FM |
| 1045 | NO FORMAL NAME |
| 1487 | GRID FM |
| 1632 | NO FORMAL NAME |
| 2091 | ROGALAND GP |
| 2091 | BALDER FM |
| 2169 | SELE FM |
| 2271 | LISTA FM |
| 2430 | VÅLE FM |
| 2449 | SHETLAND GP |
| 2449 | HARDRÅDE FM |
| 2470 | JORSALFARE FM |
| 2702 | KYRRE FM |
| 3167 | TRYGGVASON FM |
| 3288 | BLODØKS FM |
| 3292 | SVARTE FM |
| 3468 | VIKING GP |
| 3468 | HEATHER FM |
| 3472 | BRENT GP |
| 3472 | TARBERT FM |
| 3710 | NESS FM |
| 4005 | UNDIFFERENTIATED |
| 4041 | DUNLIN GP |
| 4041 | DRAKE 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.
