The Geesbrug-1 well was drilled in 1992, and perforated and tested in 1993. The production was considered uneconomic at the time. In 2009, the well was re-completed for fracture stimulation. Three horizons were targeted, the Rotliegend, Dalen and Hardenberg. Two propped fracture treatments were placed successfully and the data analyzed to estimate fracture dimensions and conductivity. The post-frac gas production was history matched using a high resolution 3D model and local grid refinement to explicitly model propped fractures. In addition to this the water production was matched to calibrate and understand the relative permeability behavior. PLT data was available at several points in time and used in the matching process. The history matched model was used to optimize the completion design (number of fractures, fracture spacing) for two additional horizontal multiple fractured wells that are planned to develop the field.

This case study illustrates the ability to accurately model the post-frac production from a vertical well producing from multiple intervals. By integrating the fracture treatment analysis with the post-frac production evaluation, a more accurate estimate of fracture and reservoir properties can be obtained, leading to better long-term forecasting and optimization of future wells and stimulation treatments.

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