Dear fellows: Sorry for the delay. Here it is PDVSAs Project Guide - Guias de Gerencia de Proyectos de Inversion de Capital (GGPIC) - PDVSA. It is not a cost estimate manual. It is just a guide to project stages scopes and procedures. Unfortanately is in Spanish.
Link:

[link Point to another website Only the registered members can access]
In a separate post I am sharing Conceptual Cost Estimating Manual (2nd Ed.) - J. Page (Gulf Professional Publishing), which for the estimation of Home Office Costs indicates engineering man hours estimates for a lot of equipments. I hope this will help.