Schlumberger Technology Corporation

Lawrence M Schwartz

Terizhandur S Ramakrishnan

Ralph Michael D'Angelo

Thomas J Plona

William E Kenyon

David J Wilkinson

Edmund J Fordham

Peter V Coveney

In this invention a new interpretation methodology has been developed. A pore structure model is used to compute the relaxation behavior. This model is then used as the kernel of a best-fit inversion scheme against the measured data, in contrast to inverting for a T.sub.2 distribution that relies on regularization. Parameters of the model are obtained by 'best fitting' the model with the data. The method considers a geometrical or physical model comprising both intergranular and intragranular porosity (microporosity). The NMR relaxation is computed by one of the several methods. The model is compactly represented by a set of physical parameters that are iterated upon until a match with relaxation data is obtained in the best fit sense. The result is obtained in terms of these physical parameters, and then integrated with other types of measurements.

Method for estimating pore structure in carbonates from NMR measurements

A method and apparatus for determining the setting time of a cement slurry. An acoustic shear wave signal is generated and introduced at a first location in the slurry. The signal is monitored at a second location for direct transmission of the shear wave signal. The time of first detection is determined at the second location which is taken as the setting time of the slurry.

Method for measuring cement thickening times

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Westport, CT, United States of America

Lawrence M Schwartz