Research on integrated cementing technology of heavy oil wells in Henan oilfield

In view of the second interface steam channeling problem of heavy oil wells in Henan oilfield,the integrated solidification and cementation technology of oil well cement-mud cake-formation has been carried out.Based on non-change of drilling fluid and cementing slurry system,the chemically integrated cementing of cement sheath-mud cake-formation has been adopted,which can reach the purpose of great improvement of the second interface cementing strength. Through compatibility experiments and cementing strength testing,good compatibility between cake modifier ( GM-Ⅰ), agglomerated cake agent ( GA-Ⅱ) and drilling fluid,cementing slurry system has been confirmed.The integrated cementing effect of cement sheath-mud cake-formation canbe greatly improved to 200%.Compared with adjacent wells,field application of 6 wells indicates the cementing quality of the second interface is obviously enhanced,which solves the second interface steam channeling problem of heavy oil wells in Henan oilfield.