Integrating Microseismic, Geomechanics, Hydraulic Fracture Modeling, and Reservoir Simulation to Characterize Parent Well Depletion and Infill Well Performance in the Bakken
- Craig Cipolla (Hess Corporation) | Monet Motiee (Hess Corporation) | Aicha Kechemir (Hess Corporation)
- Document ID
- Unconventional Resources Technology Conference
- SPE/AAPG/SEG Unconventional Resources Technology Conference, 23-25 July, Houston, Texas, USA
- Publication Date
- Document Type
- Conference Paper
- 2018. Unconventional Resources Technology Conference
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North Dakota Middle Bakken-Three Forks development has proceeded in two phases; the first phase consisted of drilling one well per drilling spacing unit (DSU) to hold the lease. Due to the time between completion of the initial well (H1) and infill development, the H1 depletion can significantly affect infill well hydraulic fracture geometry and impact well spacing decisions. The objective of this work was to characterize the effect of H1 well depletion on infill well fracture geometry and well performance. This paper documents the multi-disciplinary data integration that was required to calibrate the hydraulic fracture and reservoir simulation models.
This project included an existing Middle Bakken (MB) H1 well, two infill Three Forks (TF) wells, and one infill MB well. Microseismic depletion delineation (MDD) was performed on the existing H1 well to estimate the drainage pattern before the completion of the three offset wells. The MDD consisted of low-rate injection of 5,000 bbls of water and was monitored using microseismic. H1 bottomhole pressures were monitored during the MDD and offset well completions. Fracture geometries were determined using microseismic for the MB infill well and one of the TF infill wells, with the microseismic array in the other TF lateral. The MDD results were used to calibrate the H1 reservoir simulation model, and geomechanical modeling was used to predict the stress changes due to the H1 depletion.
The microseismic data showed fracture height covering both MB and TF formations and very asymmetric fracture growth toward the H1 depletion. Asymmetric growth was expected for the offset TF well that was 750 ft from the H1 well, but the severe asymmetry observed during the completion of the offset MB infill well that was 1,500 ft from the H1 well was not anticipated. Guided by the microseismic data and H1 “frac hits,” the results from the geomechanical modeling were combined with advanced hydraulic fracturing modeling to evaluate the effect of H1 depletion on infill well fracture geometry, accurately predicting the asymmetry. The fracture geometries for the offset wells were discretely gridded in the reservoir simulation model, and history matching was used to characterize well performance.
The reservoir simulation model accurately predicted the production behavior of the infill wells, while also matching the threefold increase in H1 production due to the numerous “frac hits” during the infill well completions. The integration of MDD, microseismic fracture geometry measurements, geomechanical modeling, advanced hydraulic fracture modeling, and detailed reservoir simulation history matching provided valuable insights into the depletion patterns of H1 wells, MB-TF connectivity, the impact of H1 depletion on infill well fracture geometry, the effect of “frac hits” on H1 well performance, and infill well performance. The calibrated hydraulic fracture and reservoir simulation models were essential components of subsequent studies to optimize Bakken development.
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