2018043 EXPERIMENTAL OPTIMIZATION OF THE FRACTURING TREATMENT DESIGN TO ENHANCE LONG-TERM GAS PRODUCTION IN SHALE FORMATIONS

The study optimizes the effect of the non-ionic surfactant and slugs of low concentration HCl on the near fracture face matrix permeability of Eagle Ford and Marcellus shale by considering different scenarios for the fracturing treatment design. Constant rate flooding apparatus was used to measure the samples base permeability and the permeability after flooding with either slickwater fluid or slickwater with nonionic surfactant or with 3 wt% HCl at 200 oF. The permeability was measured using 3 wt% KCl and at atmospheric temperature.

Three scenarios were considered. The first investigates the pad fluid type effect on the near fracture face matrix permeability. The second scenario investigates the effect of injecting non-ionic surfactant and slugs of 3 wt% HCl on the matrix permeability when a slickwater was used in the pad stage. 
The third scenario is investigating the effect of injecting slugs of 3 wt% HCl on the matrix permeability when non-ionic surfactant is added to the slickwater pad fluid.