Although there are many considerations during drilling, ADVANTEK specializes in two main
disciplines. Overcoming significant expenses of drilling through or near substantial salt bodies. The
maintenance of the wellbore itself.

The in-situ stresses are obtained from log analysis and core tests. The inclination, azimuth, horizontal stress directions and in-situ stresses are considered in the calculation of wellbore stress.

The mud temperature is significantly lower than the formation (rock) temperature, which can be expected to create thermal stress on the borehole. Thermal stress, therefore, plays a critical role in the mud weight design and the stability of various hole trajectories.

Tensile failure is the chief criterion determining the upper bound of the mud weight which must not be exceeded in effort to prevent circulation loss and hole fracturing. Fractures may occur when the lowest effective tangential stress, around the wellbore, reaches the tensile strength of the formation. The Mohr-Coulomb criterion is then applied in order to determine the minimum mud weight required to prevent wellbore collapse.

For the analysis, a linear elastic model with impermeable mudcake is used to determine the stress field around the borehole. This model is relatively simple to use and requires a minimum number of material parameters.

Experience	Solutions/Tool
Casing Failure Evaluation Well Integrity and Casing Stress Analysis Wellbore Stability Study	@Log @Well
Geographical Environments	Contact
Equatorial Guinea Gulf of Mexico Offshore Malaysia	Mr. Karim Zaki Ph. 713.532.7630 Email: Karim@ADVANTEKInternational.com