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Title: Multilateral installation from a floating rig

The Troll Olje gas province is approximately 100 km northwest of Bergen, Norway, in the Norwegian sector of the North Sea at a water depth of approximately 315 to 340 m. Troll Olje is part of the Troll gas field, where Norsk Hydro is responsible for developing two areas with thin oil rims. Before spudding the multilateral well described in this paper, 17 wells had been drilled and completed in the Troll Olje oil province. The multilateral-well concept was introduced in the gas province primarily to increase the drainage area for each well. When producing from two separate laterals, a lower drawdown pressure exists throughout the horizontal section. Therefore, gas coning is less likely to occur, and higher production rates can be sustained for a longer period of time. In addition, cost savings are substantial because of reduced well-construction time for each horizontal reservoir-drainage section and because of the reduced number of completion strings, subsea wellheads, and pipelines required for total field development. The full-length paper details design, development, testing, and installation of the first successful multilateral well installed from a floating rig offshore Norway. The paper gives a synopsis.
Publication Date:
OSTI Identifier:
634599
Resource Type:
Journal Article
Resource Relation:
Journal Name: JPT, Journal of Petroleum Technology; Journal Volume: 50; Journal Issue: 7; Other Information: PBD: Jul 1998
Country of Publication:
United States
Language:
English
Subject:
03 NATURAL GAS; NORTH SEA; OFFSHORE PLATFORMS; NATURAL GAS FIELDS; DIRECTIONAL DRILLING; RESERVOIR ENGINEERING; NATURAL GAS WELLS; WELL COMPLETION