ID: 100
OBJECTID: 100
wlbNpdidWellbore: 102
wlbName: 30/9-3 A
wlbHistory:

General

Well 30/9-3 A is a sidetrack to well 30/9-3 on the Gamma West structure on the Oseberg Fault Block in the northern North Sea. The primary objective of 30/9-3 was to find hydrocarbon accumulations in the Middle Jurassic Brent Group. Secondary objective was to find additional hydrocarbon accumulations in the Early Jurassic. Planned TD was ca 75 m below a possible intra Triassic marker to a depth of 4188 +/- 100 m. Well 30/9-3 discovered oil in the Brent Group, but reached only 3113 m in the Drake Formation due to fish in the hole. For the same reason no wire line logs were run below 1713.5 m.

Sidetrack well 30/9-3 A was drilled to complete the well programme.

Operations and results

Well 30/9-3 A was kicked off on 26 February 1984, from a window from 1539 to 1562 m in the 13 3/8" casing. The well was drilled to TD at 4300 m (4008 m TVD) in the Late Triassic Lunde Formation using the semi-submersible installation Nortrym. No significant problem was encountered in the operations. The well was drilled with Invermul/EZmul Oil Based Mud from kick-off to TD.

The Ness Formation (2853.5 - 3059 m, 2717.3 - 2890 m TVD) was encountered at a horizontal distance of 538 m to the west of the 30/9-3 well. The top of the formation had been subjected to erosion and lacked the sandstone units which were found in the upper part of the 30/9-3 well. The lithology was alternating sandstones, siltstones and shales with beds of coal. The sandstones were generally very fine to fine grained, locally medium grained, and occurred often as normally graded beds.

The Ness Formation was found oil bearing down to 3000 m (2840m TVD). No oil/water contact c
wlbHistoryDateUpdated: 2016-05-19T00:00:00