Case Study: A Unified Technique with Perforation, Well Test Before and After Stimulation, Ground Cross linked Acid Fracturing, Foreign Fluid Recovery in One Downhole Pipe String

Abstract

An unified technique with perforation, well test before and after stimulation, ground cross linked acid fracturing, foreign fluid recovery in one down hole pipe string is put forward in a carbonate reservoir, and the pilot test well is well A, located in Erlian Oil Field, Inner Mongolia. The advantage of above mentioned pipe string is that it can complete above four works by sequence just in one pipe string so it can improve work efficiency and reduce reservoir damage in a great deal. What's more, the new developed ground cross linked acid with high viscosity (more than 100 mPa.s), more compatibility, easily controlling of cross linking and gel breaking, etc. is applied so as to get a longer and wider fracture by acid corrosion, which has been verified by field case. Consequently, the post-acid fracturing rate of Well A was as high as 226 m 3 /d with no water. It has a great significance both in improving well performance and reduces cost as well.