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Exhibitors News

30.05.2010 15:45

3D presentations of the Troll oil and gas field and Grane oil field at Statoil stand.

Troll is an oil and gas field discovered in 1979 and covers 750 km2. It is considered to be the most valuable field on the Norwegian Continental Shelf in terms of energy. It represents 40 % of Norways total gas reserves. The Troll Field is also one of the most significant oil fields offshore Norway.

Since the oil is located in a thin layer, three important technological steps had to be overcome to produce the Troll oil:

  • Horizontal drilling to increase the length of the producing zone in each well. The longest horizontal leg on Troll is 5.5 km.
  • Sea Bottom templates accompanied with several well slots
  • Branched wells to maximize the use of every well slot. E.g. one of the Troll producers has seven branches.

The producing zone, the Sognefjord Fm., from late Jurrasic age, was formed by a prograding shore face with alternating zones of clean-sand deposit (beach-like) and silt/mud dominated sands. A horizontal well on Troll is planned to target as much clean sand as possible for optimal production.

The presented case study will give an example of how one of the Trolls 400 drilled wells, were carefully planned to secure as best outcome as possible.

The Troll license group consists of Petoro, Norske Shell, Total, ConocoPhillips and Statoil.

The Grane Case Study

This case study presents the Grane oil field on the Norwegian Continental Shelf.

It was discovered in 1991 and covers 10 square miles. Even though Grane is not among Norways largest oil fields, it has at the moment the platform with the highest oil production in the North Sea with its more than 200.000 barrels per day. The field has anticipated reserves of 735 million barrels and will be producing for the next 25-30 years.

Grane can be considered as an atypical Norwegian Sea field due to its:

  • Age (quite young being a 60 mill year old Paleocene sand)
  • Oil characteristic (heavy oil field)
  • Topography (very undulating top and base reservoir)

The Grane sand was deposited as density-driven turbidite currents coming from the Shetland platform in the west. They gave birth to the fields Grane, Balder, Frigg, Jotun and Sleipner.

In spite of the heavy oil characteristics, the field expect to have a 65% recovery factor in the main area. This is due to very good porosity and permeability in the reservoir. Knowledge gained through the Grane oil production, comes to use in Statoils other international heavy-oil activities as in Canada and Brazil.

In this 3D visual case study we will fly through the reservoir presenting the Grane production strategy, gas and water injectors, multi-branched horizontal wells and multi-disciplinary visualization.

The license group consists of Petoro, ExxonMobil, ConocoPhillips and Statoil.

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