Refracturing horizontal shale wells with solid-steel expandable liners ///
Many times, a well that must be hydraulically fractured to be economic will experience a production decline that will make attaining the well’s estimated ultimate recovery (EUR) impossible. In unconventional reservoirs, such as shales with long laterals requiring multiple frac stages, it is often more economical to refracture the same lateral wellbore, rather than to drill a new well. In shale reservoirs, it is common to shoot 1-to-3-ft perforation clusters, with four to six phased shots per ft (13 to 20 shots per m), with clusters spaced greater than 50 ft (15.2 m) apart.
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