6406/2-5 A
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General information
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Wellbore history
GeneralWell 6406/2-5 A is a sidetrack well to 6406/2-5, drilled on the Kristin structure in the north-western part of block 6406/2, south-west of the Smørbukk Field and north-west of the Lavrans Field on Haltenbanken. The Kristin structure is a fault bounded horst block, somewhat eroded in the western part. The discovery well 6406/2-3 was drilled high on the structure and tested gas and condensate in a down-to situation in both the Garn and the Ile Formations, while the down flank well 6406/2-5 was water filled. The sidetrack well penetrated the Fangst Group reservoirs in an intermediate position between wells 6406/2-3 and 6406/2-5. The main objective of the sidetrack well was to identify the hydrocarbon water contacts in the Kristin structure and to test the hydrocarbon potential of the Garn and Ile Formations down flank of well 6406/2-3.Operations and resultsAppraisal well 6406/2-5 A was drilled as a deviated well with the semi-submersible drilling installation "Deepsea Bergen". The well was spudded on 29 September 1997 and permanently abandoned on 23 February 1998 after one drill stem test. The sidetrack was kicked off under the 18 5/8" shoe at 1404 m. Two attempts were made to reach the reservoir. The first, 6406/2-5 A, reached 2643 m, but had to be abandoned due to hole instability problems. The second sidetrack, 6406/2-5 A T2, reached the planned TD at 5600 m (4956 m TVD), 27 m TVD into the Upper Ror Formation and approximately 2 km NNW from well 6406/2-5. The well was drilled water based with KCl and glycol (ANCO 208 and Glydrill) from kick-off to 2825 m, and with oil based mud from 2825 m to TD. A total of 146,9 days were used for drilling, coring, logging, performing one DST, and permanently abandon the well. Of this, 30.3 % (or 44,5 days) was non-productive time (NPT). Waiting on weather caused a major part of this (11 days). Well 6406/2-5 A T2 found hydrocarbons, and hydrocarbon-water contacts were successfully penetrated in both the Garn and the Ile Formations. The 6406/2-5 A T2 Garn Formation reservoir parameters were intermediate compared to the good parameters of well 6406/2-3 and the marginal parameters of well 6406/2-5. In particular the permeability values of the three wells show a large range, with the 6406/2-5 AT2 values being intermediate. The Ile Formation reservoir parameters did not differ very much from what was measured in the recent wells, but showed large vertical variation in lithology and reservoir quality. Parts of the Ile Formation show excellent reservoir qualities. Pore pressures of the Jurassic units were very high, reaching a gradient of 1.95 g/cc BMW in upper part of the Garn Formation. A total of 172 meters (7 cores) were cored in the well, of which 98.6 % were recovered. No wire line fluid samples were obtained from this well. The well was plugged and abandoned as a gas/condansate appraisal well.TestingThe Garn Formation was production tested in the interval 5304.4 - 5334 m (4691.3 - 4717.2 m TVD) with a gas rate of 221 500 Sm3/D and a condensate rate of 274 Sm3/D, giving a GOR of 821 Sm3/Sm3. -
Cuttings at the Norwegian Offshore Directorate
Cuttings at the Norwegian Offshore Directorate Cuttings available for sampling?YESCuttings at the Norwegian Offshore Directorate Cutting sample, top depth [m]Cutting samples, bottom depth [m]1440.005598.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom15307.05316.2[m ]25316.25326.0[m ]35326.05353.7[m ]45354.05389.8[m ]55390.55429.3[m ]65505.05526.7[m ]75527.05553.9[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]169.8Cores at the Norwegian Offshore Directorate Cores available for sampling?YES -
Core photos
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Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit3643641540201320132423242324892570257028533087383238323852522452385238530553055440548155775577 -
Composite logs
Composite logs Document nameDocument formatDocument size [MB]pdf0.38 -
Geochemical information
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Documents – reported by the production licence (period for duty of secrecy expired)
Documents – reported by the production licence (period for duty of secrecy expired) Document nameDocument formatDocument size [MB]pdf49.03 -
Drill stem tests (DST)
Drill stem tests (DST) Test numberFrom depth MD
[m]To depth MD
[m]Choke size
[mm]1.05304533411.1Drill stem tests (DST) Test numberFinal shut-in pressure
[MPa]Final flow pressure
[MPa]Bottom hole pressure
[MPa]Downhole temperature
[°C]1.087.00038.000Drill stem tests (DST) Test numberOil
[Sm3/day]Gas
[Sm3/day]Oil density
[g/cm3]Gas grav. rel.airGOR
[m3/m3]1.02742215000.7950.745821 -
Casing and leak–off tests
Casing and leak–off tests Casing typeCasing diam.
[inch]Casing depth
[m]Hole diam.
[inch]Hole depth
[m]LOT/FIT mud eqv.
[g/cm3]Formation test typeINTERM.13 3/82818.017 1/22820.02.01LOTINTERM.9 5/85133.012 1/45143.02.20LOTLINER75600.08 1/25600.00.00LOT -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured14331.4527.0WATER BASED17311.6744.0WATER BASED17311.6536.0KCL MUD18331.4629.0WATER BASED20221.6541.0WATER BASED21811.6440.0KCL MUD22741.6430.0WATER BASED26431.6734.0WATER BASED26431.6736.0KCL MUD28251.6550.0OIL BASED28251.6846.0KCL MUD28251.6846.0KCL MUD35101.7058.0OIL BASED38021.7352.0OIL BASED40031.7453.0OIL BASED40981.7455.0OIL BASED42001.7454.0OIL BASED43791.7456.0OIL BASED44041.7458.0OIL BASED45331.7556.0OIL BASED46901.7853.0OIL BASED47631.8155.0OIL BASED48601.8257.0OIL BASED49491.8263.0OIL BASED51041.8255.0OIL BASED51431.8255.0OIL BASED51492.0074.0OIL BASED51572.0062.0OIL BASED51842.0057.0OIL BASED52182.0260.0OIL BASED52772.0261.0OIL BASED53022.0460.0OIL BASED53252.0467.0OIL BASED53542.0465.0OIL BASED53912.0465.0OIL BASED54292.04OIL BASED54912.0471.0OIL BASED55282.0470.0OIL BASED55552.0487.0OIL BASED56002.0487.0OIL BASED56002.0480.0OIL BASED56001.24BRINE -
Pressure plots
Pressure plots The pore pressure data is sourced from well logs if no other source is specified. In some wells where pore pressure logs do not exist, information from Drill stem tests and kicks have been used. The data has been reported to the NPD, and further processed and quality controlled by IHS Markit.Pressure plots Document nameDocument formatDocument size [MB]PDF0.22