The Heidrun Field was discovered in March, 1985 in Block 6507/7 of the Norwegian sector of the North Sea. Partners in the block are Conoco Norway Inc., Operator (30%), Den norske stats oljeselskap a.s, (50%), Arco Norway Inc., (10%), and Tenneco Oil Company Norsk A/S, (10%). Reservoir delineation has begun with three additional wells drilled to date.

The Heidrun Field lies under 350 m (1150 ft) of water in Blocks 6507/7 and 6507/8. The average reservoir depth is 2375 m (7800 ft) subsea. The hydrocarbon bearing strata are predominantly unconsolidated sands which exhibit varied sedimentology, mineralogy and permeability through the section.

A variety of drilling and completion challenges will arise in order to fully exploit the reserves. Due to the relatively shallow depth of the reservoir and the areal extent of the sands. These include the following:

  • High angle drilling

  • Possible sand control measures over long sections

  • High production rate completion practices

This paper deals with preliminary drilling and completion considerations. Items covered include reservoir modelling for well requirements; well flow analysis for well capability; structure requirements to meet various alternatives; subsea well alternatives; and sand production prediction studies to help determine completion techniques.

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