Improved Single-Trip Multistage Completion Systems for Unconventional Gas Formations

Abstract

Abstract Cost-effective development of unconventional gas resources depends upon strategic application of advancing technologies. By employing efficient fracturing techniques with an appropriate multi-stage fracturing completion, operators can achieve higher initial gas rates, increased recovery rates and reduced completion costs. The completion process employs a single-trip multi-stage isolation completion system which is driving the cost-effective exploitation of difficult reservoirs. Operational issues, case studies and system improvements, such as the means to isolate water producing zones, will be covered. Key factors to be reviewed include reserve estimates, selection of number of fractures, production behavior analysis, production forecast analysis, risk analysis, fracture design, and economic evaluation. Installation strategy issues will be addressed regarding equipment and operations such as quantity and spacing of packers and sleeves as well as the fracturing process. These strategies are critical relative to achieving mechanical, volumetric and economic success which is established by the efficiency of each fracture and total gas production rate when compared to initial evaluations. The one-trip multi-stage isolation fracturing completion process reduces rig time and cost for hydraulic fracturing services, accelerates production and improves reservoir drainage. When coupled with effective fracturing strategies and best practice procedures, the system provides improved production from unconventional gas formations.