6406/3-10
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General information
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Wellbore history
GeneralWell 6406/3-10 was drilled to test the Bergknapp prospect on the Halten Terrace in the Norwegian Sea. The primary objective was to prove oil in the Middle to Early Jurassic Fangst and B t groups. In case of a discovery the well would be tested and cored.Operations and resultsWildcat well 6406/3-10 was spudded with the semi-submersible installation West Mira on 8 November 2019. West Mira completed drilling the top hole to TD in the 16" section at 2287 m and installed the 13 3/8" intermediate casing. However, problems caused by the very rough winter season and inability to essential crew change during the Covid 19 pandemic it was decided to suspend the well on 29 January 2020 and complete the remaining well scope with a different drilling unit. Two months later, the Scarabeo 8 went on contract on 3 March 2020 and drilled the remaining part of the well to TD at 4600 m in the Early Jurassic re Formation. The well was drilled with seawater and hi-vis pills down to 418 m, with KCl/polymer/GEM mud from 418 m to 1197 m and with Innovert NS oil-based mud from 1197 m to final TD. Scarabeo 8 went off contract on 5 April 2020 and the wellbore 6406/3-10 was again suspended for a year until it was re-entered with DeepSea Aberdeen for drill stem testing.The well proved hydrocarbons in the Garn, Ile, Tilje and re formations. The Garn Formation had an oil column of at least 60 meters, with the oil-water contact estimated at 4128.7 m based on the log response and the oil and water samples taken in the reservoir. The Ile Formation was penetrated with a 65-meter oil column. The reservoir has a high hydrocarbon saturation at the top of the interval, while the rest of the reservoir is likely in a transition zone. The reservoir was classified as poor and not producible and the hydrocarbon-water contact was not established. The Tilje Formation has an oil column of at least 120 meters. The Tilje reservoir has two oil-saturated intervals separated by a shaly zone, and a water-saturated zone at the base. ODTs in the Upper and Lower Tilje are estimated at 4458 m and 4506 m, respectively. The re Formation contains a lighter oil than Garn, Ile, and Tilje, Geochemical analyses also indicated a more terrigenous source for this oil. No oil-water contact was established. There were no oil shows other than in the hydrocarbon-bearing formations in the Fangst and B t Groups.No cores were cut in 6406/3-10, coring was instead planned to do in a side-track. Wireline fluid samples were taken at 4065.2 m (Oil), 4114.7 m (oil and trace water), 4132.2 m (water), 4231.8 m (OBM filtrate), 4447.7 m (oil), 4480 m (oil), 4502.7 m (oil), and 4528 m (water).The well was plugged back for side-tracking on 14 July as an oil discovery.TestingThree DSTs were run in the well during 15 June and 2 July 2021. DST 1 in the Lower Tilje Formation tested the interval 4487.5 - 4492.6 m, DST 2 in the Upper Tilje Formation with tested the interval 4432.0 - 4454.5 m, and DST 3 in the Garn Formation with tested the interval 4057.7 - 4096. 0 m. The main flow results are given here. DST 1 produced 417 Sm3 oil and 125149 Sm3 gas/day through a 36/64 " choke. This gives a GOR of 300 Sm3/Sm3. The bottom hole temperature in the test was 156 C. DST 2 produced 92 Sm3 oil and 24604 Sm3 gas/day through a 26/64 " choke. This gives a GOR of 267 Sm3/Sm3. The bottom hole temperature in the test was 156 C. DST 3 produced 45 Sm3 oil and 22542 Sm3 gas/day through a 24/64 " choke. This gives a GOR of 501 Sm3/Sm3. The bottom hole temperature in the test was 149 C. -
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]430.004600.00 -
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 typeCONDUCTOR36417.542419.00.00SURF.COND.201191.5261198.01.88FITINTERM.13 3/82281.517 1/22293.01.95FITLINER9 5/84049.012 1/44058.01.87FITOPEN HOLE4600.08 1/24600.00.00 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]6CAL DSL RCX SDP406445386CAL DSL RCX SSP40494600DSL CN ZDL FTEX 3DEX HDIL40494600DSL MRX FLEX 6CAL40494600LWD - DIR345418LWD - DIR PWD GR RES4181197LWD - DIR PWD GR RES ABG11972287LWD - DIR PWD GR RES RAB DEN NEU40554600LWD - DIR PWG GR RES ABG DEN NEU22874055LWD - SON FTWD ABG FTWD40554600MC SWC40494600VSI540494600XMAC GXPL ORIT UXPL40494600 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit34734715471969196923402340240624672467262328103352335234424032403240444065406541404192425642564293433543864533 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured3401.2619.04.7INNOVERT3601.021.03.8Sea Water4171.3911.9Water10861.3915.3Water11471.3812.9Water11971.5011.4Oil11971.3911.0Water12391.509.5Oil17861.5213.4Oil20901.5514.3Oil22701.747.6Oil40551.767.6Oil40551.255.7Oil44701.270.4Salt Base44761.267.6Oil44761.270.4Salt Base45341.257.1Oil45961.2620.04.7INNOVERT46001.256.2Oil50371.021.03.8Sea Water