Electric, acoustic, and nuclear logs, as well as rock properties information from cores and downhole tests, such as leakoff, minifrac, hydraulic fracturing, and pressure buildup, are normally available in the gas fields in Northern Mexico. The existing information was used to fully determine rock properties and to select the optimum perforating technique to minimize formation damage and to help produce gas from this type of reservoir.
The critical drawdown and formation compressibility were evaluated based on the integration of rock mechanical properties from dipole sonic and from density logs with core analysis information determining proper dynamic-to-static calibration parameters.
The process to design the perforating technique to maintain a balance between hole diameter for future hydraulic fracturing and maximum penetration to reduce the skin damage in this type of reservoir is presented in the paper. The results from different wells, as well as the advantages and disadvantages of the technique, are compared.