6506/12-10 A
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General information
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Wellbore history
GeneralThe main objective of well 6506/12-10 A was to appraise the down flanks hydrocarbons in the Garn, Ile, Tilje, and the Åre Formation, on the Smørbukk Field.Operations and resultsThe appraisal sidetrack well 6506/12-10 A was kicked off with the semi-submersible installation "Ross Rig" from 2823 m in 6506/12-10 on 25 June 1995 and drilled to 6260 m with a total cost considerably higher than planned budget. The higher costs were mainly due to kick off and orienting problems from the vertical well, lots of trips to change bits, milling cones lost in the 12 1/4" hole and problems cementing the 7" liner. In general the drilling rate was lower than expected. Oil based mud (ANCO VERT) was used trough out the sidetrack. High mud weight (1.80 g/cm3) was used in the beginning to prevent formation damage during drilling. This can have caused lower ROP than expected. Prior to testing, a lot of leakage problems occurred within the test string mainly due to bad quality of the o-rings in the Halliburton test-valves. The string was pulled and reran 5 times before all the problems were sorted out. Total lost times in the test phase was 893 hrs (squeeze cementing of 7" liner, leak in BHA of the test string, BOP problems, WOW, fishing of packer slips).Eleven cores were cut in the Tilje and Åre Formations. Two FMT samples were taken in the Garn Formation (4397.7 m TVD and 4402.7 m TVD, respectively) and one in the Tilje Formation (4806.8 m TVD). The Garn samples contained water while the Tilje sample contained oil. The 6506/12-10A well proved producible oil in the Garn, Ile, Tilje and upper parts of the Åre Formations in good sand intervals. After testing the well 6506/12-10 A was permanently plugged and abandoned on 11 December 1995 as an oil and gas appraisal well.TestingThe test plan included short tests of the Åre and Tilje Formations followed by a long term production period. Thereafter a minifrac from the rig plus a massive stimulation job of the Tilje Formation should be performed. The objectives for this operations was to try to establish the productivity improvements from a massive stimulation, and thereby more accurate be able to evaluate the production potential for the Tilje Formation within the Smørbukk field. Due to problems during cementing of the 7" liner, severe zone isolation problems occurred and the Åre test was abandoned for the more important Tilje test. The production test of well 6506/12-10 A perforated the interval 5686 m to 5706 m (4793 m to 4813 m TVD RKB) in the Tilje Formation. The Tilje test started, but it became more or less obvious during the test that it was the Åre formation that was producing 90 -100 % of the fluid and Tilje only contributed with a very small amount of fluid. Later analysis of test results, PVT analysis, comparison of FMT data from earlier wells and this well, confirm that it was the Åre formation that was produced during the test, and that the cement bound between the Åre and Tilje was broken down during the test. At the end of the test a minifrac was performed in the perforated interval to indicate stress level in the Tilje formation. The test was ended after two shiploads of oil were sent to Mongstad, and within the time budget. -
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]2800.006260.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom15674.05711.5[m ]25711.55748.4[m ]35948.05948.5[m ]45959.05971.2[m ]55972.05984.7[m ]65986.06005.0[m ]76038.06057.0[m ]86057.06060.7[m ]96119.06128.6[m ]106160.06178.0[m ]116223.06230.5[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]176.4Cores at the Norwegian Offshore Directorate Cores available for sampling?YES -
Core photos
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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 availableDSTTEST10.000.0028.10.1995 - 13:00YES -
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.9 5/85248.012 1/45250.00.00LOTLINER76260.08 1/26260.01.80LOT -
Drill stem tests (DST)
Drill stem tests (DST) Test numberFrom depth MD
[m]To depth MD
[m]Choke size
[mm]1.05707568619.0Drill stem tests (DST) Test numberFinal shut-in pressure
[MPa]Final flow pressure
[MPa]Bottom hole pressure
[MPa]Downhole temperature
[°C]1.022.000165Drill stem tests (DST) Test numberOil
[Sm3/day]Gas
[Sm3/day]Oil density
[g/cm3]Gas grav. rel.airGOR
[m3/m3]1.04501687500.810375 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]4-ARM CAL GR27803477CBL VDL GR56375776DCBIL GR52606202DPIL MAC SLH TTRM58456259DPIL MAC ZDL CN GR52485552DPIL MAC ZDL CN SLH TTRM52495878FMT QDYNE GR52735842FMT VPC CHT GR59266197MND DPR52605553MRIL XDL DN DSL52485880MWD DPR27805260MWD DPR55535781ZDL CN TTRM GR58456259ZOVSP GR28006175 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit309145219141914222722272315238423842555284834573457358048334901490149665246524653055338541654165468552455525711 -
Composite logs
Composite logs Document nameDocument formatDocument size [MB]pdf0.46 -
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]pdf33.51 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured28101.8058.012.0OIL BASED06.07.199528101.8058.012.5OIL BASED11.07.199528101.7656.010.0OIL BASED11.07.199528101.7457.011.0OIL BASED11.07.199528101.7052.010.0OIL BASED11.07.199528101.7053.010.0OIL BASED12.07.199528101.7048.09.0OIL BASED14.07.199528101.7047.09.5OIL BASED14.07.199528101.7046.09.5OIL BASED17.07.199528101.7047.09.0OIL BASED17.07.199528101.7044.09.0OIL BASED17.07.199528101.7040.08.5OIL BASED18.07.199528101.7043.08.0OIL BASED19.07.199528101.7041.08.0OIL BASED20.07.199528101.8059.010.5OIL BASED03.07.199528101.8058.011.5OIL BASED04.07.199528101.7653.010.0OIL BASED11.07.199528201.6647.08.5OIL BASED28.06.199528201.7044.08.0OIL BASED30.06.199528201.8056.09.5OIL BASED03.07.199528201.8060.011.5OIL BASED03.07.199528591.6644.08.0OIL BASED29.06.199529651.7044.08.0OIL BASED30.06.199531091.8056.09.5OIL BASED03.07.199532211.8060.011.5OIL BASED03.07.199532621.8059.010.5OIL BASED03.07.199533011.8058.011.5OIL BASED04.07.199533621.8058.012.0OIL BASED06.07.199533631.8058.012.5OIL BASED11.07.199534601.7656.010.0OIL BASED11.07.199534651.7653.010.0OIL BASED11.07.199535351.7457.011.0OIL BASED11.07.199536431.7052.010.0OIL BASED11.07.199537301.7053.010.0OIL BASED12.07.199537751.7048.09.0OIL BASED14.07.199538901.7047.09.5OIL BASED14.07.199540991.7046.09.5OIL BASED17.07.199543001.7047.09.0OIL BASED17.07.199544301.7044.09.0OIL BASED17.07.199544571.7040.08.5OIL BASED18.07.199546701.7043.08.0OIL BASED19.07.199547021.7041.08.0OIL BASED20.07.199549001.7548.09.5OIL BASED21.07.199549901.7552.010.0OIL BASED24.07.199549901.7550.010.0OIL BASED24.07.199549901.7554.011.0OIL BASED25.07.199549901.7551.010.0OIL BASED24.07.199549901.7554.011.0OIL BASED26.07.199550411.7751.010.0OIL BASED24.07.199550761.7852.010.0OIL BASED24.07.199551751.7850.010.0OIL BASED24.07.199552451.2025.07.0OIL BASED07.08.199552601.2028.07.5OIL BASED07.08.199552601.2028.07.0OIL BASED07.08.199552601.7854.011.0OIL BASED25.07.199552601.7854.011.0OIL BASED26.07.199552601.2028.07.5OIL BASED08.08.199552601.2029.08.0OIL BASED10.08.199552601.2028.07.0OIL BASED10.08.199552601.2028.07.5OIL BASED15.08.199552601.2029.07.0OIL BASED15.08.199552601.2029.07.5OIL BASED15.08.199552601.2029.08.5OIL BASED17.08.199552601.2030.07.5OIL BASED17.08.199552601.2028.08.0OIL BASED17.08.199552601.2127.07.0OIL BASED07.08.199552601.2028.08.0OIL BASED18.08.199552731.2028.08.0OIL BASED21.08.199552731.2028.08.0OIL BASED21.08.199552731.2028.08.0OIL BASED21.08.199552731.2028.08.0OIL BASED22.08.199552731.2031.09.0OIL BASED23.08.199552731.2035.010.0OIL BASED29.08.199552731.2036.010.0OIL BASED01.09.199552731.2035.09.5OIL BASED30.08.199552801.2124.06.0OIL BASED07.08.199553101.2025.06.5OIL BASED07.08.199553451.2026.07.5OIL BASED07.08.199553711.2025.07.0OIL BASED07.08.199553791.2026.07.5OIL BASED07.08.199553801.2028.08.0OIL BASED21.08.199554321.2027.07.0OIL BASED07.08.199554571.2028.07.5OIL BASED07.08.199554991.2028.07.0OIL BASED07.08.199555361.2028.07.5OIL BASED08.08.199555531.2029.08.0OIL BASED10.08.199556131.2028.07.0OIL BASED10.08.199556451.2028.07.5OIL BASED15.08.199557111.2029.07.0OIL BASED15.08.199557371.2028.08.0OIL BASED22.08.199557371.2028.08.0OIL BASED21.08.199557371.2031.09.0OIL BASED23.08.199557371.2028.08.0OIL BASED21.08.199557531.2029.07.5OIL BASED15.08.199557811.2029.08.5OIL BASED17.08.199558461.2030.07.5OIL BASED17.08.199558901.2028.08.0OIL BASED17.08.199558901.2032.09.0OIL BASED25.08.199558901.2030.07.5OIL BASED29.08.199558901.2033.09.0OIL BASED25.08.199558901.2028.08.0OIL BASED18.08.199558931.2029.08.5OIL BASED29.08.199559121.2033.08.5OIL BASED29.08.199559481.2035.010.0OIL BASED29.08.199559591.2035.09.5OIL BASED30.08.199559721.2036.010.0OIL BASED01.09.1995