Javier Alejandro Franquet

Wireline Straddle Packer Microfrac Testing Enables Tectonic Lateral Strain Calibration in Carbonate Reservoirs

Wireline straddle packer microfrac tests have become an important technology in creating microfractures to measure in-situ formation breakdown pressure, fracture re-opening pressure, fracture closure pressure and stress contrast between reservoir and non-reservoir intervals. The formation tensile strength can also be estimated from the difference between breakdown and re-opening downhole pressures. This case study describes the use of microfrac tests measurements to validate and calibrate the horizontal stress profile in various intervals of the carbonate reservoir. Well-injection plans, cap-rock integrity assessment, shale reservoir fracture containment, stress contrast and minimum and maximum horizontal stress estimations can all be quantified from microfrac test measurement. Six straddle packer stations were tested for microfracturing in this study well. One microfrac test was repeated in one formation due to observed poroelastic effects in the fracture re-opening pressure responses. Poroelastic effects around the borehole occur when the pore pressure near the borehole increases with the injection cycles, thereby making it more difficult to effectively re-open the pre-existing induced fracture. When poroelastic effects are evident, it is important and recommended to record the first pressure fall-off cycle after the formation breakdown for fracture-closure identification. Subsequent cycles will indicate higher fracture closure pressures and therefore overestimate the minimum horizontal stress in the interval. This paper describes the pre-job modeling, real-time monitoring and post-job interpretation of straddle packer microfrac testing for recalibration of the geomechanical model to provide continuous logs of in-situ horizontal stress profiles over the entire interval.

Critically-Stressed Fracture Analysis Contributes to Determining the Optimal Drilling Trajectory in Naturally Fractured Reservoirs

This case study illustrates a critically stressed fracture analysis (CSFA) for three wells drilled in offshore Vietnam fractured granites.

Acoustic Thin-bed Analysis to Enhance Stoneley Permeability and Mechanical Properties Processing in Laminated Carbonate Reservoirs

This paper presents an acoustic thin-bed analysis in a laminated carbonate reservoir in order to enhance the Stoneley-wave permeability estimation and the rock mechanical characterization. The results of the enhanced acoustic characterization were corroborated and validated by a wireline acoustic image log.

Advanced Dipole Borehole Acoustic Processing – Rock Physics And Geomechanics Applications

Today’s advanced borehole acoustic analysis not only enhances the rock physic characteristics of shale gas plays but it also provides new insights in geomechanics applications and fracture identification. Current borehole acoustic tools can detect the azimuthal and transverse shear wave intrinsic rock anisotropy. They also help identify stress-sensitive formations and help in the evaluation of natural fractures, those that intersect the borehole as well as those that do not.