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PETROMAKS-Maksimal utnyttelse av petroleumsreserver

Identification of rock and material properties with new 2-frequency ultrasound technique

Tildelt: kr 3,7 mill.

The proposed project uses new, dual frequency ultrasound methods to addresses ultrasound identification of material properties such as rock properties during drilling and properties of polymer walls in flexible risers. New, dual frequency ultrasound metho ds (SURF methods) have been developed at NTNU for medical ultrasound imaging. With current ultrasound measurements one transmits a single band ultrasound pulse, while with the SURF methods one transmits dual band pulse complexes, where a low band pulse is used to nonlinearly manipulate the material elasticity observed by a co-propagating high band pulse that is used for the measurement. The methods opens for quantitative estimation of material parameters, which has interesting applications to identify por osity and permeability of oil&gas carrying layers during drilling, and monitor any changes in polymer material properties in the wall of flexible riser tubes. Currently measurement of porosity and permeability is done by nuclear techniques which provides safety hazards. The proposed project will build experimental instrumentation and further develop and investigate the new methods as described. The project is an extension of the NFR-FORNY project 179776/I10, with focus on identification of material proper ties with experimental testing of the identification. Positive results also have value for the SMARTPIPE project funded by NFR-PETROMAKS. The work is done in collaboration between NTNU, SINTEF Petroleum Technology, Trondheim, and CMR Bergen

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PETROMAKS-Maksimal utnyttelse av petroleumsreserver