oa Development of a mechanical Earth model for Qatari reservoirs

Qatar is rapidly gaining ground as one of the world leaders in the production of natural gas. In order to keep-up with the growing demand for gas production it is essential that non-productive time be reduced. Another hurdle is that new wells are being drilled in more challenging environments, and thus better forecasting methods while-drilling become a necessity. The aim of this presentation is to show the development of a mechanical Earth model (MEM) for Qatar’s reservoirs, using the principles pioneered by Plumb et al. The MEM is a mathematical representation of the state of stress as well as rock mechanical properties for a specific stratigraphic section in a field. This model will allow efficient drilling and stimulation of new wells, both technologically and economically. For the development of this model, several parameters were included: mechanical strength, elastic properties, in-situ stresses and pore pressure. These parameters can be determined from sonic, caliper and density logs, core sample analysis, geophysical data and real-time drilling data such as drilling rates, kicks and cuttings. Laboratory data included strength, elastic properties, porosity and permeability. A significant benefit of this research was preparing an updated stress map for Qatar. The MEM is useful for planning drilling operations, multi-lateral design of wells, as well as reservoir modeling and management. The Qatar MEM can be adapted to other regions of the Middle East and forms a reference database for future projects.