The development of the tight gas sands in the northwest flank of Shell/Esso's Leman field required massive hydraulic fracture (MHF) stimulation. Well tests were commissioned to help understand the link between fracture design and performance. A statistical analysis of the test results gave credence to the hypotheses that hydraulic fractures connected these wells to a large natural fracture system, that the hydraulic fractures were semiradial in shape, and that a minimal productivity loss arose from the limited communication between wellbore and fracture. These results have assisted in further stimulation design.