Experimental Studies On Formation Damage Relieving By Ultrasonic-Acidization Treament

PL19-3 oilfield is a lithologic reservoir drive by structure.The essential feature is multiple zone,Strong heterogeneity.Oil fields are accepts various blockage during mining.It is necessary to take various technical measures to blockage removal and increase production.For carbonate reservoirs,Acidification is a conventional blockage removal method,But for different reservoirs and different types of blockage,the acidizing process is different.Physical plugging technology has advantages such as no harm,low cost,quick response,multiple processing,and combined with other process measures.The study of this paper combines the specific conditions of offshore oilfield plugging,An ultrasonic-acidification compound blockage removal method is developed to improve the plugging effect of production wells and injection wells in offshore oilfields.Reducing the cost of blockage removal.The technology of ultrasonic-acidification to blockage removal and increasing production is a new compound production technology combining the ultrasonic wave and acidification increase production measures.Ultrasonic-acidification can prevent or inhibit the blockage formation near sidewall or perforation,Which is a dynamic blockage removal project,and can not only improve the acidification blockage removal effect but also increase the acidification blockage removal distance.Based on the analysis of PL19-3 Oilfield Geology,analysis of the ratio of core components to the reservoir,based on basic physical test experiment,screening core with experimental value.Based on the study of the mechanism of ultrasonic increasing production and increasing injection,In the laboratory we simulated of inorganic scale blockage,polymer blockage,and drilling fluid blockage are the three most common blockage processes in oilfield operation.Develope quantitative study on ultrasonic blockage removal,Explored the quantitative relationship between ultrasonic parameters and blockage removal effect.According to the actual situation of the reservoir,Experimental on acidification such as corrosion,corrosion inhibition and core flow were carried out,An acid liquor system suitable for blockage removal is initially selected.We use experimental device for dynamic simulation of wave field oil recovery,Laboratory experiments on removing inorganic scale blockage,polymer blockage and drilling fluid blockage by ultrasonic wave,The main factors affecting the effect of ultrasonic blockage removal are studied systematically,Compared the effect of ultrasonic,acidification and ultrasonic-acidification blockage removal,further optimize the sequence of ultrasonic blockage removal and acidizing blockage removal after preliminary optimization of ultrasonic blockage removal parameters.The results show that the ultrasonicacidification blockage removal effect is better,The best way is to have ultrasonic blockage removal and acidification blockage removal simultaneously.By the means of theoretical analysis and experimental study,Optomizate the parameters and process of ultrasonicacidication,It provides theoretical and experimental basis for guiding the on-site construction of ultrasonic-acidification blockage removal,It is helpful to improve the construction effect and success rate of ultrasonic-acidification blockage removal.