In China, more and more mature wells require re-stimulation to extend their productive life, this requires utilizing expandable tubular patching to restore wellbore integrity, followed by plug-and-perf operations to create complex fracture networks, thereby enlarging stimulated reservoir volume and enhancing well productivity. However, this technique introduces operational challenges including irregular wellbore ID at plug setting depth and reduced inner diameter at liner hanger, which potentially smaller than standard plug OD.

Vertechs addresses this challenge with an innovative dissolvable plug, specifically designed for re-stimulation in casing-patched wells. This solution has been successfully deployed in Northwest China, where downhole temperatures average 140°F. After installing expandable tubular patching in the horizontal section (final ID: 4.13"), the narrowest restriction - a liner hanger with an ID of just 3.62". 

Vertechs' dissolvable plug, with an OD of 3.35", reliably passes through these tight clearances and sets securely on the irregular inner wall of the expandable tubular patching, demonstrating consistent performance throughout the operation.Post re-frac, the well's production increased by 55%, Oil production rate increased 14-fold. 

For more information about Vertechs dissolvable technologies, please feel free to contact us.