Over the last decade an unconventional revolution has occurred through the use of horizontal drilling and hydraulic fracturing. Countless operators have invested billions to develop new resources and implement factory mode completions which have changed the landscape of the oil and gas industry. The impact of unconventional completions has led to a global market surplus of both oil and gas at the date of this publication. To succeed in today's market, operators must evolve by testing innovative methods to drill and complete unconventional developments with a focus on capital efficiency.
The most common completion method for shale horizontal wells is a cemented plug and perforation stage design. Although aspects of the plug and perforation design have been optimized to deliver improved well performance and operational efficiency, there is still an opportunity to maximize cluster efficiency and zonal isolation. One of the methods is creating pin point fractures through the use of coiled tubing cemented sleeves. The sleeves allow for single point injection and greater control of fracture initiation to maximize stimulated rock volume and reservoir drainage across the lateral.
While some in the industry have trialed the technology, few have focused on how to optimize the sleeve design in terms of fracture interaction and completion design. Linking the design of the sleeve technology to upfront modeling efforts can accelerate the application in unconventional plays. This paper will present the modeling aspects and surveillance to optimize shale completions through the use of coil tubing frac sleeves. Furthermore, operational aspects of this alternative completion method and various learnings that provide for future optimization will be discussed. Finally, field data will be used to illustrate the impact of the completion design.
This paper focuses on upfront modeling efforts, field implementation, and resulting analyses of a non-traditional type of completion technique — single point entry completion system. Plug and perf is the operator's completion method of choice and it is widely believed that achieving complete cluster efficiency is challenging using this method. In contrast, the single point entry completion system is expected to provide the technical limit for cluster efficiency.