Process for predicting the performance quality of an oil bore hole cementation and evaluating this performance

摘要

The invention concerns the cementaion of an oil bore hole or of similar bore holes.;According to the invention, the theoretical acoustic impedance of cement is evaluated as a function of some theoretical cementaion parameters, this impedance is corrected as a function of the actual meeasured density of the cement slag during pumping, a correlation is established between with the depth as a function of the data recorded during cementation and of the bore hole geometry, and a value Z = f (depth) is deducted therefrom, which gives access to the prediction of the accoustic atteenuation curve :CBL (prediction ) = f (depth) corresponding to the parameters of the actual cementation.;By comparison with the (measured) CBL curve, the exact zone where a secondary or repair cementation will be necessary is deducted.