Generated 11.02.2012
|
|
The NPD's Fact-pages |
|
|
Generated 11.02.2012 |
|
After more than 10 years as a fact provider NPDs FactPages version 1 will be shut down in Dec. 2011.
Start using FactPages version 2 now! See also FactPages version 2 Quick Reference' If you have any questions or comments please send an e-mail to FactWEB@npd.no. |
| NPDID wellbore: | 3209 | |
| Well name: | 25/8-11 | |
| Drilling operator name: | Esso Exploration and Production Norway A/S | |
| Geodetic datum: | ED50 | |
| Coordinates: | 59° 18` 07.00`` N | 2° 26` 51.00`` E |
| UTM coordinates: | 6573957.14 N | 468534.61 E |
| UTM zone: | 31 | |
| Drilled in production licence: | 027 | |
| Area: | NORTH SEA | |
| Discovery: | 25/8-11 RINGHORNE | |
| Field: | BALDER | |
| Drill permit: | 909-L | |
| Drilling facility: | WEST ALPHA | |
| Drilling days: | 48 | |
| Wellbore entry date: | 16.10.1997 | |
| Wellbore completion date: | 02.12.1997 | |
| Original wellbore purpose: | WILDCAT | |
| Wellbore purpose: | WILDCAT | |
| Wellbore status: | P&A | |
| Wellbore contents: | OIL | |
| Discovery wellbore: | YES | |
| Formation/age with hydrocarbons 1: | HERMOD FM / PALEOCENE | |
| Formation/age with hydrocarbons 2: | STATFJORD FM / EARLY JURASSIC | |
| Seismic location: | ES9403 3D- INLINE 3824 & X-LINE 2313 | |
| Kelly bushing elevation (KB) [m]: | 18 | |
| Water depth [m]: | 128 | |
| Total Depth (MD) [m]: | 1994 | |
| Final vertical depth (TVD) [m]: | 1994 | |
| Max inclination [°]: | 2.97 | |
| Bottom hole temperature [°C]: | 82 | |
| Oldest penetrated age: | EARLY JURASSIC | |
| Oldest penetrated formation: | STATFJORD FM | |
| Note: All depths, except the water depth, are relative to kelly bushing (RKB) | ||
General
The 25/8-11 well was drilled in PL 027 with Esso as the operator and sole licensee. The well was drilled in the Ringhorn prospect, which is located approximately 14 km North of Balder. The primary target was the Paleocene Hermod Formation sandstones. Jurassic sandstones constituted a secondary target.
Operations and results
Wildcat well 25/8-11 was spudded with the semi-submersible drilling rig "West Alpha" on 16 October 1997 and drilled to a total depth of 1994 m in Early Jurassic sediments of the Statfjord Formation. The well was drilled with spud mud down to 1001 m and oil-based mud from 1001 m to TD. Hydrocarbons were encountered in both targets. Top Hermod sandstones were found at 1765 m. The Paleocene OWC (from wire line log) was found at 1775 m. The Paleocene reservoir properties were close to those of the Balder reservoirs and it was not the plan to test this reservoir. The top of the Jurassic reservoir (Top Statfjord Formation) came in at 1891 m. The Jurassic OWC (from wire line log) was found at 1935 m. The discovery in the Jurassic was the first of it's kind in this area and it was therefore decided to test this part of the Ringhorn Discovery. One core was cut in the interval 1763 m to 1790 m from lowermost Sele Formation and through half of the Hermod Formation. Two MDT samples were taken in the Statfjord Formation: one oil sample from 1919 m and one water sample from 1938 m. After production testing the well was suspended as an oil discovery on 2 December 1997.
Testing
A DST was performed in the interval 1892.5 m to 1909.5 m in thin sands of the Upper Statfjord Formation. The well produced 517 Sm3 oil per day and with a GOR of 42 Sm3/Sm3 on a 40/64th inch choke. Only surface samples were collected. Initial reservoir conditions at 1882 m were found to be 18.74 Mpa and 78 deg C. The plan was to continue with the test by perforating a lower sand interval and do a commingled test of both sand intervals. Due to bad weather this was delayed and when the weather improved technical problems lead to suspension of the test without any data obtained from the lower interval.
Interval [m]: 1030.00 - 1994.50
Core length [m]: 26.70
| Core number | Interval |
|---|---|
| 1 | 1763.00-1789.70 |
 1763-1768m |
 1768-1773m |
 1773-1778m |
 1778-1783m |
 1783-1788m |
 1788-1790m |
| Test type: | Bottle test number: | Bottle interval [m]: | Fluid type: | Test date and time: |
|---|---|---|---|---|
| DST | 1893.000 - 1910.000 | 1997.11.15 00:00 | ||
| DST | DST1 | 1893.000 - 1910.000 | 1997.11.15 00:00 |
| Type | Casing diam. [inch] | Depth below KB [m] | Hole diam. [inch] | Hole depth below KB [m] | Lot mud eqv. [g/cm3] |
|---|---|---|---|---|---|
| CONDUCTOR | 30 | 220.0 | 36 | 221.0 | |
| INTERM. | 13 3/8 | 998.0 | 17 1/2 | 1008.0 | |
| OPEN HOLE | 1994.0 | 8 1/2 | 1994.0 |
| Depth MD [m] | Mud weight [g/cm3] | Visc. [MPa.s] | Yield [pnt Pa.] | Mud type | Date measured |
|---|---|---|---|---|---|
| 1001 | 1.32 | 24.0 | OIL BASED | ||
| 1024 | 1.32 | 26.0 | OIL BASED | ||
| 1471 | 1.32 | 20.0 | OIL BASED | ||
| 1565 | 1.32 | 25.0 | OIL BASED | ||
| 1790 | 1.33 | 26.0 | OIL BASED | ||
| 1994 | 1.13 | DUMMY | |||
| 1994 | 1.32 | 26.0 | OIL 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 | 1893 - 1910 | 16.0 | 0 |
| Test no. | Oil [Sm3/day] | Gas [Sm3/day] | Oil grav. [g/cm3] | Gas grav. rel.air | GOR [m3/m3] |
|---|---|---|---|---|---|
| 1.0 | 520 | 23000 | 44 |
| Log type | Intervals logged [m] |
|---|---|
| MWD - GR RES DIR | 219 - 1001 |
| MWD - DIR | 920 - 998 |
| MWD - GR RES DIR | 1024 - 1994 |
| AIT UBI DSI | 992 - 1986 |
| CMR IPL | 1671 - 1990 |
| LDL CNL GR | 1578 - 1995 |
| MDT | 1766 - 1981 |
| SWC | 1678 - 1985 |
| VSP | 350 - 1990 |
| Top depth [m] | Litostratigraphic unit |
|---|---|
| 146 | NORDLAND GP |
| 555 | UTSIRA FM |
| 651 | NO FORMAL NAME |
| 708 | HORDALAND GP |
| 708 | SKADE FM |
| 904 | NO FORMAL NAME |
| 943 | SKADE FM |
| 978 | NO FORMAL NAME |
| 1129 | GRID FM |
| 1138 | NO FORMAL NAME |
| 1678 | ROGALAND GP |
| 1678 | BALDER FM |
| 1743 | SELE FM |
| 1765 | HERMOD FM |
| 1768 | SELE FM |
| 1774 | HERMOD FM |
| 1796 | SELE FM |
| 1824 | LISTA FM |
| 1872 | VÅLE FM |
| 1876 | SHETLAND GP |
| 1876 | EKOFISK FM |
| 1891 | NO GROUP DEFINED |
| 1891 | STATFJORD FM |
|
Composite log (Format:PDF. Size: 0.312 Mb) |
|
|
You need an ACROBAT reader from ADOBE to display the reports in pdf format. |
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.
