Hydraulic fracturing treatments are often significantly impacted by near-wellbore flow regimes that are not anticipated and usually unaccounted for. Identifying the existence of these unusual flow restrictions and quantifying their magnitude has been described in previous work done by Cleary et al.' This paper presents case histories showing the value of simple pump-in/shutdown tests before large-scale hydraulic fracture treat-ments to evaluate such near-wellbore formation restrictions as tortuosity, existence of multiple fractures, and perforation fric-tion, based on the previous work of Cleary et al. These case history evaluations have led to more predictable job outcomes. Testing includes step-down rate tests, water-hammer effects, and fluid efficiency test analysis. These tests are all conducted and analyzed before the treatment, on the day of the treatment.

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