{
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  "LayerName" : "Wellbore - History",
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    "wlbNpdidWellbore" : 1689,
    "wlbName" : "31/5-4 A",
    "wlbHistory" : "\r\n\u003cp\u003e\u003cb\u003eGeneral\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eWell 31/5-4 A was drilled as a horizontal\r\nside track to well 31/5-4 S in the Troll West oil and gas province. The well\r\nobjective was test production from the 13 m oil layer in the Sognefjord\r\nFormation. The test production should evaluate the oil production potential\r\nfrom the Troll West Gas Province, obtain dynamic data from a potential\r\ndevelopment type well, and obtain static reservoir and geological data to\r\nprovide proper understanding of well behaviour. \u003c/p\u003e\r\n\r\n\u003cp\u003e\u003cb\u003eOperations and results\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eWell bore 31/5-4 A was kicked off from\r\n31/5-4 S at 1569 m on 10 October 1990, using the semi-submersible installation\r\nTransocean 8. Due to difficulties in building sufficient angle, the well was\r\nplugged back and technically sidetracked from 1604 m. The 9 5/8" casing\r\nwas set horizontally at 1803 m, and the well drilled horizontally for another\r\n800 m to TD at 2603 m in the Late Jurassic Sognefjord Formation. The well was\r\ndrilled with Carbotec oil based mud from kick-off to TD. The horizontal section\r\nwas drilled in the oil bearing part, approximately 1 meter above the oil-water\r\ncontact.\u00A0 No cores were cut and no fluid samples taken. The well was completed\r\nwith a prepacked screen in the horizontal section. A clean-up test and a\r\nproduction logging test was conducted with the Transocean 8 before the well was\r\nsuspended on 13 Dcember 1990 and connected to the vessel Petrojarl I for a\r\nlong-term production test. Well 31/5-4 A is classified as an oil and gas\r\nappraisal well.\u003c/p\u003e\r\n\r\n\u003cp\u003e\u003cb\u003eTesting\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eThe well was tested from the horizontal\r\ninterval in the Sognefjord Formation beyond the 9 5/8" casing shoe , i.e.\r\n1801-2603 m RKB / 1578.5 m TVD RKB +/- 0.3 m. The measured test data from the\r\nend of the second and final production logging period, with the production\r\nlogging tool (PLT) at 1825 m / 1578.5 m TVD RKB, were reported as follows: Oil\r\nrate = 217 Sm3/day, gas rate = 11869 Sm3/day, water rate = 318 Sm3/day, GOR =\r\n55 Sm3/Sm3, CO2 content = 1%, oil d",
    "wlbHistoryDateUpdated" : "2026-02-24T00:00:00"
  }
}