| 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 Phi 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 alpha(t) from Vp(t), at a pressure Pl and a temperature Tl; . a step B wherein alpha(t) is determined on the basis of desired values of fineness Phin 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 Phin of the cementitious system, pressure Pn and/or temperature Tn from alpha(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 Phin 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. |
