METHOD FOR CHARACTERISING THE MECHANICAL BEHAVIOUR OF CEMENTS

摘要

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 Φ thereof and the speed of the compression waves on the basis of time Vp(t) are the only input data of the method. Said method comprises: a step A of estimating the degree of hydration of the cementitious system on the basis of time α(t) from Vp(t), at a pressure P1 and a temperature T1; a step B wherein α(t) is determined on the basis of desired values of fineness Φn of the cementitious system, pressure Pn and/or temperature Tn; 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 Φn of the cementitious system, pressure Pn and/or temperature Tn from α(t) determined in step B; 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 Φn 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.

主权项

1. A method for determining mechanical parameters of a cement system of initial composition C0 and of fineness Φ, as a function of time, and as a function of the fineness of the cement system, pressure and/or temperature, comprising the following steps:
(A) determining the degree of hydration of the cement system as a function of time α(t) from the velocity of the compression waves as a function of time Vp(t) measured in a specimen of the cement system, at a pressure P1 and a temperature T1; (B) determining the degree of hydration α(t) as a function of desired values of fineness Φn of the cement system, of pressure Pn and/or of temperature Tn; (C) determining the composition of the cement system as a function of time C(t) and as a function of desired values of fineness Φn of the cement system, of pressure Pn and/or of temperature Tn, from the degree of hydration α(t) determined in step B; (D) determining at least one mechanical parameter of the cement system as a function of time, and as a function of the desired values of fineness Φn of the cement system, of pressure Pn and/or of temperature Tn, from the composition of the cement system C(t) determined in step C.