Application and improvement of magnetic resonance imaging to the observation of fluids and fluid flows in cores of reservoir rocks.
Magnetic resonance imaging (MRI) is now a well established technique for biological and medical studies. Efforts to apply MRI to material science are very recent. Imaging of fluid filled porous rock appears of scientifically and technically important potential. Oil production, exploration and logging problems would benefit from knowing the spatial repartition and the relative mobility of fluid phases in a core sample.
Several tasks are included in the work program :
1) Saturation imaging : Fluid filled rocks are very difficult samples for MRI. An evaluation of the various imaging techniques will be performed on several rock-fluid systems.
2) Permeability imaging : Sequential imaging during flooding displacement experiments will be performed on specially selected samples. Direct flow measurements will also be attempted.
3) Quantitative measurements : The accuracy of the measurements will be determined as a function of spatial parameters. Special RF excitation methods and new probe design will be used to improve the quality of the measurements.
4) Data processing : The sensitivity of MRI is intrinsically low and improvement of the S/N ratio will be attempted by special data processing and postprocessing of the image by maximum entropy methods. Backprojection methods will be adapted in order to image samples characterized by very short T2 relaxation time.
Funding SchemeCSC - Cost-sharing contracts
2400 København Nv
1017 Koebenhavn K/copenhaegen