RESEARCH & APPLICATION OF FOAM ACIDIZING TREATMENT TECHNOLOGY IN HORIZONTAL WELL

When drilling horizontal wells,the time of drilling fluid into the formation is longer to damage the formation permeability.Finally it induces the productivity of the horizontal wells decreasing.In order to solve this damage problem,the new foamed acid treatment technology has been developed.The new technology has overcome the limitation of general acid treatment.This article introduced the properties of the foamed acid,including viscosity,the delay corrosiveness,stabilization of the foam,sand-carrying ability and the surface tension.The application effects of this technology in horizontal wells were analyzed,which justified the foamed acid had good delay corrosiveness capacity,excellent flowback ability and sand-carrying ability,and the technology could be applied to horizontal wells of TUHA oilfield for low-damage acid treatment.