Total Sa

Jean-Benoit Laudet

Axel-Pierre Bois

Jean Sulem

Manh-Huyen Vu

Siavash Ghabezloo

The present invention relates to a method for determining mechanical parameters of a cementitious system, on the basis of time, and on the basis of the fineness of the cementitious system, pressure and/or temperature, representative of the in situ conditions found in wellbores. The initial composition of the cementitious system, the fineness &#x3a6; thereof and the speed of the compression waves on the basis of time V(t) are the only input data of the method. Said method comprises: &#x25aa; a step A of estimating the degree of hydration of the cementitious system on the basis of time &#x3b1;(t) from Vp(t), at a pressure Pand a temperature T; &#x25aa; a step B wherein &#x3b1;(t) is determined on the basis of desired values of fineness &#x3a6;n of the cementitious system, pressure Pn and/or temperature Tn; &#x25aa; a step C wherein the composition of the cementitious system is determined on the basis of time C(t) and on the basis of desired values of fineness &#x3a6;n of the cementitious system, pressure Pn and/or temperature Tn from &#x3b1;(t) determined in step B; &#x25aa; and a step D of determining at least one mechanical parameter of the cementitious system on the basis of time and on the basis of desired values of fineness &#x3a6;n of the cementitious system, pressure Pn and/or temperature Tn, from C(t) determined in step C. According to the method of the invention, these parameters can be determined while the cementitious system is still very young. In particular, the parameters of static deformability and hydro-mechanical coupling parameters are determined by the method according to the invention.

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Pau, France

Jean-Benoit Laudet