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The cleanup phase after hydraulic fracturing is often unavoidable, because under-displaced proppant will remain in the wellbore.1 During this stage, personnel and equipment are usually still in place, and any flowback can be handled easily. In contrast, proppant flowback during the well's production phase may lead to:
•Local loss of fracture conductivity, causing a reduction in hydraulic fracturing's potential benefits
•Damage to equipment (abrasion to valves, tubing, surface pipelines and other equipment).
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