34/7-3
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General information
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Wellbore history
GeneralWell 34/7-3 was drilled on the Snorre E structure in the northern part of block 34/7. The purpose was to further appraise the reservoir potential of the Statfjord Formation and upper Lunde Formation in the E-structure extension of the Snorre Discovery and to test the oil/water contact found in wells 34/4-4 and 34/7-1.Operations and resultsWell 34/7-3 was spudded with the semi-submersible installation Vildcat Explorer on 14 September 1984 and drilled to TD at 3414 m in the Late Triassic Lunde Formation. Drilling proceeded without significant problems. The well was drilled with spud mud down to 454 m, with gel mud from 454 m to 1165 m, with KCl/Polymer mud from 1165 m to 2769 m, and with ligno/lignosulphonate mud from 2769 m to TD.The well consisted mainly of claystones in the Tertiary and Cretaceous sections, with the exception of sand development in the Utsira Formation (Miocene), and an Early Oligocene sand development (1288 - 1323 m). The rest of the well, the Jurassic and Triassic sections, was mainly composed of alternating claystone/sandstone sequences. Top Statfjord was encountered at 2414 m.The Statfjord and Lunde Formations were oil filled down to a common OWC at 2610 m based on pressure gradients. Strong shows on cores continued down to 2622 m, below this depth the shows became weak and spotted. Apart from this oil shows, of variable quality, started in silty claystones at 2180 m in the Late Cretaceous and continued down to 2755 m in the Lunde Formation.A total of 19 cores were taken in the interval 2396 - 2643 m in the Jurassic (Dunlin- and Statfjord Formations) and the Triassic sequence (Upper Lunde Formation). The core recovery was 91.5%. Core depth for core 17 was 0.5 m deeper than logger's depth and core depth for core 19 was 2.0 m shallower than logger's depth. Otherwise core depths were found equal to logger's depth. In addition to conventional cores 240 sidewall cores were recovered in this well. RFT fluid samples were taken at 2418 m (oil), 2475 m (oil/water/mud), and 2605 (water and mud filtrate with small amount of oil)The well was permanently abandoned on 2 January 1985 as an oil appraisal well.TestingThree drill stem tests were carried out.DST 1 tested the interval 2601.0 to 2607.5 m in the upper Lunde Formation. It produced 293 Sm3 oil/day through an 8 mm choke. The separator GOR was 28.5 Sm3/Sm3, the oil density was 0.840 g/cm3, and the gas gravity was . The down hole temperature measured in the test was 94.4 deg C.DST 2 tested the interval 2505.0 to 2513 m in the Statfjord Formation. It produced 666 Sm3 oil/day through an 11 mm choke. The separator GOR was 26 Sm3/Sm3, the oil density was 0.836 g/cm3, and the gas gravity was . The down hole temperature measured in the test was 91.4 deg CDST 3 tested the interval 2440.9 to 2449 m in the Statfjord Formation. It produced 1390 Sm3 oil/day through a 12.7 mm choke. The separator GOR was 32 Sm3/Sm3, the oil density was 0.838 g/cm3, and the gas gravity was . The down hole temperature measured in the test was 89.4 deg C.All tests produced clean oil with no water or sand. The initial oil formation volume factor ranged from 1.23 m3 /Sm3 to 1.35 m3 /Sm3 in DST1 to DST3 test intervals respectively. -
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]460.003379.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom12396.02414.0[m ]22414.02414.5[m ]32414.52425.5[m ]42425.52434.1[m ]52439.02449.8[m ]62450.02458.8[m ]72459.52467.8[m ]82469.02470.7[m ]92471.02481.5[m ]102481.52486.8[m ]112487.52505.5[m ]132506.52515.5[m ]142515.52518.0[m ]152519.02527.0[m ]162527.52528.4[m ]172549.52553.0[m ]182606.02623.0[m ]192625.02643.0[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]160.4Cores at the Norwegian Offshore Directorate Cores available for sampling?YES -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory1095.0[m]SWCRRI1125.0[m]SWCRRI1135.0[m]SWCRRI1155.0[m]SWCRRI1170.0[m]DCRRI1180.0[m]DCRRI1195.0[m]SWCRRI1220.0[m]DCRRI1235.0[m]SWCRRI1240.0[m]DCRRI1260.0[m]DCRRI1275.0[m]SWCRRI1290.0[m]DCRRI1300.0[m]DCRRI1330.0[m]DCRRI1360.0[m]DCRRI1380.0[m]DCRRI1395.0[m]SWCRRI1415.0[m]SWCRRI1425.0[m]DCRRI1440.0[m]DCRRI1455.0[m]SWCRRI1470.0[m]DCRRI1485.0[m]DCRRI1495.0[m]SWCRRI1515.0[m]DCRRI1535.0[m]SWCRRI1545.0[m]DCRRI1560.0[m]DCRRI1605.0[m]DCRRI1620.0[m]DCRRI1740.0[m]DCRRI1770.0[m]DCRRI1790.0[m]DCRRI1800.0[m]SWCRRI1828.0[m]SWCRRI1850.0[m]SWCRRI1860.0[m]DCRRI1875.0[m]SWCRRI1890.0[m]DCRRI1900.0[m]SWCRRI2240.0[m]SWCRRI2260.0[m]DCRRI2330.0[m]SWCRRI2355.1[m]SWCRRI2362.0[m]DCRRI2364.0[m]SWCRRI2380.0[m]SWCRRI2388.0[m]SWCRRI2396.0[m]CRRI2414.7[m]CRRI2429.2[m]CRRI2449.8[m]SWCRRI2452.3[m]CRRI2454.9[m]CRRI2656.0[m]DCRRI2671.0[m]DCRRI2683.0[m]DCRRI2884.0[m]DCRRI -
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 availableDSTDST12601.002607.5005.12.1984 - 06:07YESDSTDST3B2440.902449.40OIL25.12.1984 - 22:10YES -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit328112311331288132316721672168818311831194023532353235723632363241425132513 -
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]pdf17.12 -
Drill stem tests (DST)
Drill stem tests (DST) Test numberFrom depth MD
[m]To depth MD
[m]Choke size
[mm]1.0260126078.02.02505251311.03.02441244912.7Drill stem tests (DST) Test numberFinal shut-in pressure
[MPa]Final flow pressure
[MPa]Bottom hole pressure
[MPa]Downhole temperature
[°C]1.02.03.0Drill stem tests (DST) Test numberOil
[Sm3/day]Gas
[Sm3/day]Oil density
[g/cm3]Gas grav. rel.airGOR
[m3/m3]1.030084000.840282.0680176800.836263.01370438720.83832 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]00BGL CAL GR11531924BGL GR4511158CDR CAL GR11521826CDR CAL GR11531924CNL EPL PCT NGT19212761CNL GR27523412CST00DLL MSFL GR23352764GR322451ISF LSS GR4511162ISF LSS GR11531923ISF LSS MSFL GR27523411ISF MSFL BHC GR19212543LDL19212767LDL GR4511163LDL GR11531924LDL NGL27523412RFT HP GR19212543RFT HP GR19212768RFT HP GR27523413SHDT GR19212768SHDT GR27523413VSP4513412 -
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 typeCONDUCTOR30451.036454.00.00LOTSURF.COND.201153.0261168.01.62LOTINTERM.13 3/81922.017 1/21940.01.70LOTINTERM.9 5/82753.012 1/42786.01.96LOTOPEN HOLE3414.08 1/23414.00.00LOT -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured3541.03WATER BASED16.09.19846521.07WATER BASED16.09.198410211.1346.031.0WATER BASED17.09.198411651.1945.030.0WATER BASED25.09.198411651.1448.031.0WATER BASED20.09.198411651.1945.030.0WATER BASED25.09.198411651.2452.034.0WATER BASED25.09.198411651.2653.035.0WATER BASED25.09.198411651.1348.032.0WATER BASED20.09.198411651.1448.031.0WATER BASED20.09.198411651.2452.034.0WATER BASED25.09.198411651.2653.035.0WATER BASED25.09.198411651.2650.028.0WATER BASED25.09.198411651.2650.028.0WATER BASED25.09.198411681.2648.022.0WATER BASED25.09.198411681.1344.010.0WATER BASED01.10.198411681.1344.010.0WATER BASED01.10.198414301.1344.010.0WATER BASED01.10.198415751.2850.020.0WATER BASED01.10.198418601.3750.020.0WATER BASED03.10.198419401.4655.019.0WATER BASED03.10.198419401.5059.020.0WATER BASED04.10.198419401.5054.018.0WATER BASED07.10.198419401.5058.020.0WATER BASED07.10.198419401.5059.020.0WATER BASED04.10.198419401.5054.018.0WATER BASED07.10.198419401.5058.020.0WATER BASED07.10.198419451.5055.018.0WATER BASED07.10.198422141.6717.018.0WATER BASED11.10.198423091.6821.018.0WATER BASED14.10.198423761.7324.015.0WATER BASED14.10.198423961.7324.015.0WATER BASED14.10.198424281.7023.014.0WATER BASED31.10.198424281.7024.014.0WATER BASED01.11.198424281.7024.014.0WATER BASED01.11.198426111.7024.016.0WATER BASED02.11.198426991.7052.016.0WATER BASED03.12.198426991.7052.016.0WATER BASED03.12.198426991.6170.020.0WATER BASED03.12.198427861.6320.014.0WATER BASED15.11.198428461.6120.014.0WATER BASED19.11.198429341.6170.020.0WATER BASED03.12.198430341.6119.014.0WATER BASED19.11.198431971.6119.014.0WATER BASED21.11.198433181.6163.012.0WATER BASED21.11.198433721.6163.012.0WATER BASED23.11.198434141.6167.012.0WATER BASED26.11.198434141.6169.012.0WATER BASED26.11.198434141.6170.010.0WATER BASED27.11.198434141.6170.010.0WATER BASED29.11.198434141.6165.012.0WATER BASED26.11.198434141.6169.010.0WATER BASED27.11.198434141.6167.012.0WATER BASED26.11.198434141.6169.012.0WATER BASED26.11.198434141.6169.010.0WATER BASED27.11.198434141.6170.010.0WATER BASED29.11.198434141.6170.010.0WATER BASED27.11.1984 -
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