SPE Online Education
Using Well Heterogeneity as an Advantage to Designing Stage Specific Diverter Strategies
Recorded On: 08/19/2019
When hydraulically fracturing a horizontal wellbore with multiple perforation clusters, the fluid being pumped into the reservoir will preferentially take the path of least resistance. Perforations that are located in the lowest stressed rocks will take a larger amount of fluid, and those perforations located in highest stressed rocks will receive less, or in some cases none. One of the ways that engineers are trying to overcome these differences is the use of diverters. A fluid diverter is typically inserted at some point within a hydraulic fracturing pump schedule to seal off dominant fractures, allowing fluid to flow into under-stimulated fractures.
The problem with this methodology is that without reservoir knowledge, operators rely on rules of thumb developed through trial and error to determine when and how much diverter to use. Data has shown how this methodology can be ineffective, leaving some clusters over stimulated and others under-stimulated. Anecdotal evidence also supports these concerns because equally sized diverter slugs do not always have equal pressure response.This talk will discuss a methodology that examines well heterogeneity, and designs the diversion strategy based on the rock properties within each fracturing stage. In addition to rock properties, the method proposed utilizes stress shadows, perforation design, and modified pump schedules to ensure equal cluster stimulation in diverter applications.
The result of this workflow is a tool that has been used to maximize the effectiveness of diverters which has shown, through several case studies that will be discussed, to result in better producing wells at lower completions cost.
Chief Technology Officer, Drill2Frac
Kevin has 20 years of industry experience both with an operator and in the service industry. Before joining Drill2Frac as the Chief Technology Officer, where he has worked for the last 2 years, he was the Director of Completions at Rice Energy where he led a team of engineers in creating the top performing wells in the region. Before that he held multiple positions including Stimulation Domain Expert over a fifteen-year career at Schlumberger. He is the lead inventor on seven patents related to fracturing procedures and tools, and has authored many SPE papers and contributed to several industry publications primarily focused on shale completions. Kevin has also been honored with multiple industry awards, most recently for his creation and development of ”Engineered Diversion Strategies”, which was selected as the World Oil Awards “2018 Best Completion Technology”. Kevin received a Bachelor’s degree in Chemical Engineering from the University of Waterloo in Canada.
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