Well Test Analysis of Multiple Hydraulically Fractured Horizontal Wells MHFHW in Gas Condensate Reservoirs

Abstract

Horizontal wells with multiple fractures are becoming more prevalent in the Industry. They can especially beneficial in gas condensate reservoirs to minimize the pressure drop in order to reduce liquid drop-out and reduce the severe loss of well productivity and therefore lower gas recovery. Reliable evaluations of stimulation performance are required for field development planning. As such, pressure transients are often used, and can be successful, to observe and define the various impacting factors of stimulation, such as fracture length, conductivity, orientation, etc.This project investigates the modeling and interpretation of pressure transient responses of multiple hydraulic fractured horizontal wells in gas condensate reservoirs using a numerical reservoir model with a focus on the existence of different mobility zone due to condensate dropout. Derivative shapes expected from hydraulic fractured horizontal well-test data are obtained using a 3D fully compositional model in gas condensate reservoirs below the dew point under various conditions. The numerical model is validated using an analytical solution and applied to a simple reservoir model. Complex reservoirs are then simulated and pressure transient response signatures are obtained. Sensitivity studies of important reservoir, well and fracture properties are performed and a result of each case is presented.It was found that condensate dropout near the wellbore yields a well-test composite behavior; similar to what is found in hydraulically fractured vertical wells, but superimposed on a horizontal well behavior, which makes it much more complex. Furthermore a higher gas production will be achieved in a horizontal well with optimum number of fractures, fractures conductivity and fracture half length which may depend on formation and hydrocarbon characteristics.

Characteristic Value Method of Well Test Analysis for Horizontal Gas Well

“…Recent years have seen the ever-growing application of horizontal wells technology, which aroused considerable interest in the exploration of horizontal well test analysis [1][2][3][4]. In order to surmount the challenges in estimating horizontal well productivity and parameters, analytical solutions for interpreting transient pressure behavior of horizontal wells have attracted great attention.…”