Interpreting Natural Fracture Directions in Horizontal Wells from Wellbore Image Logs
O. Jørgensen, N. W. Petersen, 2003. "Interpreting Natural Fracture Directions in Horizontal Wells from Wellbore Image Logs", Horizontal Wells: Focus on the Reservoir, Timothy R. Carr, Erik P. Mason, Charles T. Feazel
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A method is presented to discriminate on wellbore image logs natural open fractures from far more abundant drilling-induced fractures in horizontal wells in the Dan chalk field, offshore Denmark. The method recognizes that drilling-induced fractures are predominantly shear failures in a preferred orientation relative to the wellbore, whereas natural fractures are confined to a limited strike range determined by the regional stress field.
The strike of natural fractures derived from the image logs agrees well with core analyses and with the strike of hydraulic fractures generated during injection and stimulation. Valuable information on likely injection fracture propagation direction can thus be derived.
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Horizontal Wells: Focus on the Reservoir
This book provides an overview of the new technical approaches required for best use of horizontal and extended-reach technology in different reservoir situations. The volume is a selection from more than 50 papers presented at an AAPG/SPWLA Hedberg Research Symposium, “International Horizontal and Extended Reach Well Symposium: Focus on the Reservoir,” held in The Woodlands, Texas, on October 10 14, 1999. The 16 chapters describe horizontal and extended-reach wells and drilling programs in a variety of geologic settings all over the world.