15/6-11 A
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General information
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Wellbore history
GeneralWell 15/6-11 A was drilled to appraise the 15/5-1 Dagny Discovery in the South-eastern end of the Viking Graben. The north-eastern extension of this structure, the Ermintrude Segment, was tested in 2007 by well 15/6-9 S and side tracks 15/6-9 A&B, which proved oil and gas in a down-to situation in the Hugin Formation, and in communication with the Dagny Discovery. Well 15/6-11-A was drilled on the western part of the Ermintrude structure, on the saddle point between the main Dagny segment and the Ermintrude Segment. The main objective was thus to delimit and test the extension of the hydrocarbon-bearings sands in Hugin Formation of the Dagny Discovery. If hydrocarbons were confirmed a drill stem test would be conducted.Operations and resultsAppraisal well 15/6-11 A was sidetracked from the primary well 15/6-11 S on 26 December 2010. Kick-off point was 1981 m. The well was drilled with the semi-submersible installation Ocean Vanguard to TD at 4305 m (3853 m TVD) in the Early Jurassic Statfjord Formation. No significant problems were encountered in the operations. The sidetrack well was drilled with XP-07 14A oil based mud from kick-off to TD.The target reservoir sandstones of the Hugin Formation were encountered at 4121 m (3708.5 m TVD), 12.5 m deeper than prognosis. The Hugin Formation was found to be heterolithic siltstone/sandstone at the top but grading to better sand quality with depth. Good sandstones with high gas values and hydrocarbon shows were encountered 4138 m. Both the core and the logs showed presence of hydrocarbons in the Hugin Formation with OWC at 4167 m (3745 m TVD). There were shows indications also in sands in the Sleipner Formation and in the Statfjord Formation towards TD of the well.A core was cut from 4148 m to 4179 m. The core shift relative to the logs was found to be close to + 2.3 m for the whole core. MDT wire line fluid samples were taken at 4148 m (oil and gas), and at 2597.7 m (water).The well was permanently abandoned on 13 March 2011 as a gas/condensate appraisal well.TestingA drill stem test was conducted from perforations at 4137.8 m to 4158.5 m in the gas/condensate bearing zone of the Hugin Formation. The test produced 120 Sm3 oil and 220000 Sm3 gas /day through a 32/64" choke. The GOR was 1830 Sm3/Sm3. The bottom hole temperature at reference depth was 118 deg 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]1990.004305.20 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom14148.04181.0[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]33.0Cores at the Norwegian Offshore Directorate Cores available for sampling?YES -
Oil samples at the Norwegian Offshore Directorate
Oil samples at the Norwegian Offshore Directorate Test typeBottle numberTop depth
MD [m]Bottom depth
MD [m]Fluid typeTest timeSamples availableDST4158.004139.58OIL25.02.2011 - 19:40YES -
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 typeLINER9 5/84002.012 1/44006.02.13LOTLINER74304.08 1/24305.00.00LOT -
Drill stem tests (DST)
Drill stem tests (DST) Test numberFrom depth MD
[m]To depth MD
[m]Choke size
[mm]1.04148418012.7Drill stem tests (DST) Test numberFinal shut-in pressure
[MPa]Final flow pressure
[MPa]Bottom hole pressure
[MPa]Downhole temperature
[°C]1.022.000118Drill stem tests (DST) Test numberOil
[Sm3/day]Gas
[Sm3/day]Oil density
[g/cm3]Gas grav. rel.airGOR
[m3/m3]1.0120220000 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]MWD LWD - ARCRES8 TELE40104148MWD LWD - ARCVRES8 TELE19894003MWD LWD - GVR ARC6 TELE40104305 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit137786996132817482109210921672217224527572850285028953284371537183802380239143935396739674009412141214201428642864291 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured4201.3928.0Spud Mud19501.4913.0XP-07 - #1422441.3928.0XP-07 - #1426311.4023.0XP-07 - #1429021.3925.0XP-07 - #1430421.4028.0XP-07 - #1431171.4024.0XP-07 - #1433901.4227.0XP-07 - #1434301.4323.0XP-07 - #1434771.4524.0XP-07 - #1435491.4826.0XP-07 - #1440031.5029.0XP-07 - #1440031.5025.0XP-07 - #1440281.5028.0XP-07 - #1440761.5030.0XP-07 - #1441741.5034.0XP-07 - #1441801.5131.0XP-07 - #1443051.5230.0XP-07 - #1443051.5027.0XP-07 - #1443051.5026.0XP-07 - #1443051.5231.0XP-07 - #1443051.5032.0XP-07 - #14 -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory3965.0[m]DC3970.0[m]DC3975.0[m]DC3980.0[m]DC3985.0[m]DC3990.0[m]DC3995.0[m]DC4000.0[m]DC4006.0[m]DC4012.0[m]DC4018.0[m]DC4024.0[m]DC4030.0[m]DC4036.0[m]DC4042.0[m]DC4048.0[m]DC4054.0[m]DC4060.0[m]DC4066.0[m]DC4072.0[m]DC4078.0[m]DC4084.0[m]DC4090.0[m]DC4096.0[m]DC4102.0[m]DC4105.0[m]DC4108.0[m]DC4114.0[m]DC4117.0[m]DC4120.0[m]DC4123.0[m]DC4126.0[m]DC4129.0[m]DC4132.0[m]DC4135.0[m]DC4138.0[m]DC4141.0[m]DC4144.0[m]DC4147.0[m]DC4148.0[m]C4150.0[m]DC4151.7[m]C4153.0[m]DC4156.0[m]DC4156.2[m]C4159.0[m]DC4159.5[m]C4162.0[m]DC4163.1[m]C4163.9[m]C4165.0[m]DC4165.6[m]C4168.0[m]DC4171.0[m]DC4171.7[m]C4174.0[m]DC4174.6[m]C4177.0[m]DC4178.0[m]C4179.1[m]C4180.0[m]DC4183.0[m]DC4186.0[m]DC4189.0[m]DC4192.0[m]DC4195.0[m]DC4198.0[m]DC4207.0[m]DC4213.0[m]DC4219.0[m]DC4225.0[m]DC4231.0[m]DC4237.0[m]DC4243.0[m]DC4249.0[m]DC4255.0[m]DC4261.0[m]DC4267.0[m]DC4273.0[m]DC4279.0[m]DC4285.0[m]DC4291.0[m]DC4297.0[m]DC4303.0[m]DC4305.2[m]C