Unconventional (Shale Gas & CBM)
We offer a robust geomechanical design for hydraulic fracture treatment by exploiting effective stimulation of natural fractures via combined shear and tensile failure. This ensures an enhanced SRV with complex and conductive fracture network. Our methodology is based on rigorous geomechanical modeling that takes advantage of critically stresses natural fractures integrated with microseismic data, and coupled with the reservoir model. The model is then integrated with production simulator to optimize the completion design, well spacing, and determine fracture fluid.
Casing Failure Mitigation
Our workflow for casing integrity consists of three components: rigorous lithological analysis of overburden, geomechanical analysis of casing failure mechanisms (buckling, bending, shear, or tensile) using multi-finger caliper logs, and 3D analysis of the change in stresses and strains in the overburden as a result of injection or production. The results from the model is used to determine areas susceptible to various failure mechanisms. Based on the findings, we will recommend mitigation steps that could include strengthening the casing. avoiding certain orientations, or reducing deformations.
Caprock Integrity & Reservoir Containment
We offer a multi-faceted approach to caprock integrity and reservoir containment analysis. This includes operation optimization, wellbore
assessment (including abandoned wells), and caprock integrity considering the role of natural fractures and faults. ARG provides planning, design, supervision and execution for various phases including lab and field characterization of overburden and caprock, in situ stress determination, geological evaluation of natural fractures and faults, and fully coupled reservoir geomechanical simulation. While we are confident this approach provides a reasonable
factor of safety for reservoir containment, we also provide recommendation and design for a monitoring program that would ensure a timely alarm shall any unexpected breach occur.
Cyclic Steam Stimulation (CSS)
In Cyclic steam stimulation (CSS), the injection of steam at high pressure and temperature is associated with shear failure of reservoir, dilation, fracturing, and fluidization of sands, as
well as thermal expansion. The corresponding
reservoir uplift is large and such, impact on caprock and casings is extreme. In ARG, we provide essential reservoir geomechanics services for CSS including, diagnosis of fracture pressure, reservoir dilation and compaction drive
analysis, reservoir and fracture containment,
optimizing steam volumes, caprock monitoring, and casing failure mitigation.
Salt Cavern Stability Analysis
Common concerns for salt cavern development are: damage propagation around the cavern as a result of salt creep, differential deformation between salt and interbedded non-salt layers, effect of multiple caverns nearby, and ground surface subsidence. We use an in-depth approach to address those concerns. This includes comprehensive geotechnical characterization experiments in the lab and field, building custom visco-plastic constitutive models for the salt dome and intersperced layers as well as a constitutive model for damage, and incorporating those into a 3D numerical simulation. We also design and recommend geomechanical monitoring instruments to calibrate and update the numerical model during the operation phase.