Abstract This case study details the use of Sealed Wellbore Pressure Monitoring (SWPM) to improve the characterization of fracture geometry and propagation during stimulation of inter-connected stacked pay in the South Texas Eagle Ford Shale.
The SWPM workflow utilizes surface pressure gauges to detect hydraulically induced fracture arrivals at horizontal monitor locations adjacent to the stimulated wellbore (Haustveit et al. 2020). A stacked and staggered development in Dewitt County provided the opportunity to jointly evaluate primary completion and recompletion efforts spanning three reservoir target intervals. Five monitor wells at varying distances across the unit were employed for SWPM during the stimulation of four wells. An operational overview, analysis of techniques, correlation with seismic attributes, image log interpretations, and fracture model calibration are provided.
Outputs from this workflow allow for a refined analysis of the overall completion strategy. The high-density, five well monitor array recorded a total of 160 fracture arrivals at varying vertical and lateral distances, with far-field fracture arrivals providing significant insight into propagation rates and geometry. A pronounced trend occurred in both arrival frequency and volumes pumped as monitor locations increased in distance from the treatment well. Specific to target zone isolation, it was identified that traversing vertically in section through a high stress interval yielded a 30% reduction in arrival frequency. An indirect relationship between horizontal distance and arrival frequency was also observed when monitoring from the same interval. A decrease in fracture arrivals from 70% down to 8% was realized as offset distance increased from 120 to 1,700 ft.
The results from this study have proven to be instrumental in guiding interdisciplinary discussion. Assessing fracture geometry and propagation during stimulation, particularly in the co-development of a stacked pay reservoir, is paramount to the determination of proper completion volume, perforation design, and well spacing. Leveraging the observations of SWPM ultimately provides greater confidence in field development strategy and economic optimization.
Biography Kourtney Brinkley is currently functioning as a Senior Geologist within the South Texas group at Devon Energy. Prior to serving in her Geology role, Kourtney has worked in operations as a Drilling and Completions Engineer along with subsurface responsibilities as a Reservoir Engineer. Within Devon, Kourtney has worked a variety of assets including the STACK, Eagle Ford, Powder River and Delaware Basin. Kourtney’s background includes a dual degree. She is a graduate of Oklahoma State University with a bachelor’s degree in Geology and a second bachelor’s degree in Petroleum Engineering from The University of Oklahoma. Kourtney currently serves as member of the Industry Advisory Board of the Mewbourne School of Petroleum and Geological Engineering and Energy at OU and is a committee member for the SPE Near Wellbore Optimization workshop.
This event will be hosted in Packard's Private Event Space (directly west of the main restaurant). Lunch will be served at 11:30am.