ENCLOSED ACIDIZING TECHNOLOGY IN GAOTAIZI RESERVOIR IN DAQING

Closure acidizing is usually used in carbonate reservoir,which is a kind of remedy method to the formed acid etched fracture.Because the damage by the partially solved particles to the fracture is removed,the acid etched fracture conductivity and its efficiency are enhanced in order to finally enhance the oil production.The study,which to the feature of flexile mineralogical composition and the past hydraulic fracture of the Gaotaizi layer in the western Daqing Oilfield,analyzed the stimulation project,enlarged the application extent of the closure acidizing technology which gave the novel opinion about acidizing removed the damage by the fracture fluid in the hydraulic fracture,and study the fracture fluid and the acidizing fluid system formulations suit to the reservoir.Two oil wells have been stimulated in the closure acidizing technology,and the oil production after closure acidizing is higher 50% than that of hydraulic fracture.It is advised to further stimulate other oil wells to test this method and technology.