Cement Slurry Used in Block Faja Venezuela

Geological factors affecting the cementing job quality and heavy oil production in block Faja, Venezuela, include: unconsolidated sandstone formations that are easy to collapse, associated gases, formation, heterogeneity that is disadvantageous to subsequent heavy oil production, long production time that imposes rigorous requirements on the mechanical integrity of cement sheaths. A high temperature anti-channeling cement slurry with enhanced toughness has been developed to solve these problems. Laboratory evaluation demonstrated that the cement slurry had good thickening performance, filtration behavior and sedimentation stability. The cement slurry had UCA transition time that is less than 20 min, and good anti-channeling performance. The elastic modulus of the set cement was greatly reduced to 2.6 GPa, the tensile strength was greater than 1 MPa, and the coefficient of heat transfer is 0.65 and 1.13, meaning that the set cement had good thermodynamic property. The set cement, after aging 5 d at 315℃, was not decreasing. All in all, the cement slurry has the potential to satisfy the needs for steam flooding, and is worth applying in other areas.