Evolution of Completion Techniques in the Lower Shaunavon Tight Oil Play in Southwestern Saskatchewan

摘要

The Oil and Gas industry has explored and developed the Lower Shaunavon formation through vertical drilling and completion technology.In 2006,previously uneconomic oil reserves in the Lower Shaunavon were unlocked through horizontal drilling and completions technologies.This success is similar to the developments seen in many other formations within the Williston Basin and Western Canadian Sedi- mentary Basin including Crescent Point Energy’s Viewfield Bakken play in southeast Saskatchewan. In the Lower Shaunavon play,the horizontal multistage completion era began in 2006,with horizontal divisions of four to six completion stages per well that utilized ball-drop sleeves and open-hole packers. By 2010,the stage count capabilities of ball-drop systems had increased and liners with nine to 16 stages per well were being run. With an acquisition in 2009,Crescent Point Energy began operating in the Lower Shaunavon area.The acquisition was part of the company’s strategy to acquire large oil-in-place resource plays.Recognizing the importance that technology brings to these plays,Crescent Point Energy has continuously developed and implemented new technology.In 2009,realizing the success of coiled tubing fractured cemented liners in the southeast Saskatchewan Viewfield Bakken play,Crescent Point Energy trialed their first cemented liners in the Lower Shaunavon formation. At the same time,technology progressed with advancements in completion strategies that were focused on fracture fluids,fracture stages,tool development,pump rates,hydraulic horsepower,environmental impact,water management,and production. In 2013,another step change in technology saw the implementation of coiled tubing activated fracture sleeves in cemented liner completions.Based on field trials and well results in Q4 2013,Crescent Point Energy committed to a full cemented liner program in the Lower Shaunavon. This paper presents the evolution of Crescent Point Energy’s Lower Shaunavon resource play of southwest Saskatchewan.The benefits of current completion techniques are:reductions in water use, increased production,competitive well costs,and retained wellbore functionality for potential re-fracture and waterflooding programs.