RESEARCH OF DRK TOUGHNESS SLURRY SYSTEM

In order to improve the cement sheath dynamic impact strength such as anti-perforation and anti-fracturing etc. and improve the interlayer seal capability after perforation, we conduct the study on enhancing cement sheath toughness. We research and manufacture impact toughness cement additive. It can improve the toughness and deformation ability of cement stone by high molecular polymer toughening agent under the function of cross-linking agent. Based on conventional performance evaluation test on slurry in the laboratory, we compare the perforation impact resistance evaluation test with field perforation test by the dynamic mechanics performance test equips and perforation simulated experiment apparatus The experiments show that DRK toughness slurry has rapid setting、early strength、lower water loss and right angle thickening performance and it is of benefit to preventing and controlling the occurrence of water and gas breakthrough. It not only can improve the cement quality effectively but also improve the cement sheath perforation impact resistance. And it benefits extend the oil well life span and increase productivity.