An extensive fracturing study has been completed, evaluating over 400 fracture treatments on more than 130 Mesaverde gas wells in the Piceance Basin. This study involved a comparison of many types of fracturing fluids and techniques. Linear gels, foams, energized fluids, titanate crosslinked fluids, zirconium crosslinked fluids and borate crosslinked fluids have all been utilized in stimulating the Mesaverde formation in the study area. The authors evaluated the success of previous treatments which ultimately resulted in stimulation design changes, operational modifications, and expanded quality control methods. Dead strings were utilized on a number of treatments to record static tubing measurements and incorporate into a three dimensional (3D) fracture stimulation model. The modeling work assisted in determining fracture geometry which led to job size changes and revised perforating schemes. This paper will illustrate a number of correlations relating the effect of fracturing fluid viscosity, job size and completion method. Based upon the correlations of the study and the modeling work conducted, Barrett Resources has been able to greatly optimize their fracture treatments from the standpoint of cost effectiveness and enhancement of natural gas production.

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