Dan Field - Danish North Sea

Conference · Fri Mar 01 04:00:00 EST 1991 · AAPG Bulletin (American Association of Petroleum Geologists); (United States)

OSTI ID:5572816

Joergensen, L N ^[1]

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1. Maersk Oil and Gas, Copenhagen (Denmark)

The Dan field is a simple, salt-induced structural dome with the bulk of oil and gas trapped in low permeability chalk of Upper Cretaceous and Lower Paleocene age. Oil in place is in excess of 2 Bbbl. Matrix permeabilities are generally less than 3 md. Permeability enhancement from natural fracturing as d toit is known from other chalk fields in the North Sea appears to be limited. The lack of natural fracturing gave rise to rapid production decline in the wells drilled during the 1970s and early 1980s. Significant effort was continuously directed towards overcoming the lack of natural fracturing. In 1987, the first horizontal well was drilled in the Dan field. This was to be the industry's first hydraulically fractured well. Since then, seven more horizontal wells with massive propped hydraulic fractures have been drilled in the field. The technique has more than doubled production per well, thereby proving to be viable for further development of the Dan field. Horizontal wells have recently successfully been placed in three other chalk fields in the Danish North Sea. The introduction of horizontal wells has required strong geological participation in the well planning phase. In particular, determination of the orientation of the in-situ stress has been the subject of extensive investigation. In the drilling phase, geological involvement has led to optimization of certain geological techniques, such as high-resolution biostratigraphy that is required to ensure correct stratigraphic placement of the individual well.

• OSTI ID: 5572816
• Report Number(s): CONF-910403--
• Conference Information: Journal Name: AAPG Bulletin (American Association of Petroleum Geologists); (United States) Journal Volume: 75:3
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
03 NATURAL GAS
030300 -- Natural Gas-- Drilling
Production
& Processing
ATLANTIC OCEAN
CENOZOIC ERA
CRETACEOUS PERIOD
DENMARK
DEVELOPED COUNTRIES
DIRECTIONAL DRILLING
DRILLING
ENGINEERING
ENHANCED RECOVERY
EUROPE
FRACTURING
GEOLOGIC AGES
GEOLOGIC DEPOSITS
GEOLOGIC TRAPS
HYDRAULIC FRACTURING
MESOZOIC ERA
MINERAL RESOURCES
NATURAL GAS DEPOSITS
NATURAL GAS FIELDS
NATURAL GAS WELLS
NORTH SEA
OFFSHORE SITES
OIL FIELDS
OIL WELLS
PERMEABILITY
PETROLEUM DEPOSITS
RECOVERY
RESERVOIR ENGINEERING
RESOURCES
SCANDINAVIA
SEAS
STIMULATION
SURFACE WATERS
TERTIARY PERIOD
WELL STIMULATION
WELLS