8 Pages

Experimental modeling of high thermal gradients in steam injection wells

R.F. Correia, E.M.R. Fairbairn & R.D. Toledo-Filho C.R. Miranda

In oil wells, the main purpose of cementing the annulus between the casing and the formation is to provide effective zonal isolation. Cementing failures occur when the well is submitted to cyclic steam injection. The heating process induces stress in the cement sheath due to deformations that take place in the casing (Thiecelin et al., 1997). Many recent studies (Dean & Torres 2002, Pedersen et al., 2006 & STILES 2006) demonstrate that the loss of hydraulic isolation is caused by either cement debonding or cement cracking, which happen due to the thermal gradient between the cement sheath and the casing.