Mechanical Earth Model Construction
To reduce risk of geological complications during drilling, as well as increase the completions efficiency, operation and enhancement of oil recovery, it is necessary to fully understand the borehole failure conditions, formation, perforation, surface facilities and downhole equipment. This is achieved by using the Mechanical Properties, Pressure and Stress Model (MEM) to solve engineering problems related to well drillability, hydraulic fracturing and forecast of changes in reservoir during development.
The rock Mechanical Properties, Pressures and Stresses Model is a numerical representation of the values of the stratigraphic column and reservoir pressures, tectonic stresses, mechanical and strength properties of rock, including their deformation qualities throughout the section. This model is based on drilling, logging and geological data and is calibrated using tests, measurements and drilling data. Unfortunately, the stress-strain state in a separate well can significantly differ from the strengths at neighbouring wells and sectors, so the model is adjusted to the conditions existing in specific wells, and then the possible variations across the field are determined. The most effective solution in this case is a 3D Model, where based on the MEM for each specific well and seismic data, the model is constructed covering the entire area.
The use of the MEM increases the field operations efficiency by reducing costs, minimizing drilling and well completion issues. The Mechanical Earth Model allows to solve drilling problems (optimal well trajectory, optimal mud density and equivalent circulation density, formation pressure and fracture gradient profiles, optimal casing depths) and for completions (Direction of perforation and drop-down pressure to prevent sanding, maximum optimum discharge pressure mode for cuttings utilization and water injection into the reservoir, fracture control and monitoring of fault activation due to production and subsidence of layers).