Research By The East River Oilfield Injection Program Câ…¢ First Lithologic Oil Group

Because of the High inhomogeneity and bad property of the Tarim basin Donghe oilfeild CⅢ1st reservoir, the water injection is usually inaccessible to the geology injection allocation. So the producing energy is defect and the oil production is downslide. The convention acidization can’t relieve the deep contamination.So how to solove the low water flooding efficiency and the difficulty of depressurizing augmented injection and enhanced oil recovery of Donghe oilfeild CⅢ1st reservoir become the recent important task.This paper analyzed the data of well testing and production test and the evaluation of reservoir sensibility and reservoir damage and the technology of stimulation treatment and augmented injection. And also finished the adaptability of acid augmented injection including the analyse experiment of reservoir mineral and the type of reservoir contamination and the corrosion feature of acid to the contaminating material.Combinaed with the reservoir feature, we optimized the acidizing fluid system including the experiment of optiming acidizing fluid composition and the experiment of acidizing fluid corrosion and the experiment of the compatibility of acidizing fluid with the reservoir and the experiment of the chemically retarded of acidizing fluid. On the basis of those basic researchment,we finished the technology of the aicd augmented injection including the imitation experiment of core contamination and the imitation experiment of effect of acid stimulation and the imitation experiment of uniform acidizing and augmented injection comparison experiment of weather the eacted acid flowback or not.And als finished the design of the technology of the acid augmented injection and the treatment of the acid augmented injection in Donghe oilfeild CⅢ1st reservoir. According to the merit of high inhomogeneity and in order to realize the even acidization,a plan put hydrotroped diverting into the acidizing fluid was proposed, and a simulated experiment was did in the experimental laboratory. The multi-hydro acid was recommended to apply in DH1-H15well in this reservoir and attained the great effect of augmented injection.