低渗透油田提高单井产量技术应用及评价

油水井在修井、开采过程中造成地层污染,产量下降,为了稳定并提高单井产量,开展了堵塞机理研究、低产原因分析、不同油藏工艺措施优选等研究与应用,近几年主要采取的措施类型主要有土酸酸化、暂堵酸化、乳化酸酸化等措施类型,但随着油田开发时间的延长,油井含水上升,堵塞类型复杂,并且油井措施次数增加,部分井采取常规酸化已经达不到增油降水的目的,因此引进多氢酸酸化、负压返排工艺、泡沫酸酸化、潜在酸酸化等措施,目的在于减缓酸岩反应速度、提高酸化后残液的返排率,减缓油井含水上升速度。

Application and evaluation of technologies to increase well yield in low permeability oilfield

During the work over and development of oil and water wells,formation contaminant and production drawdown will probably happen.To sustain and increase the individual well production,plugging mechanism,reasons of low productivity and preference of different reservoir technologic measures are researched and carried out in Changqing Oilfield Company Oil Production Plant 3 In these years,the technologies mainly contain clay acid treatment,bridging acid treatment,and emulsified acid treatment.However,with the development of the oilfield,the water ratio and the frequency of treatment of the oil wells both increased, and the plugging becomes complicated.The traditional acid treatments have been useless in increasing oil production and reducing water production in some wells.Therefore,multi-hydro acid treatment,negative pressure flowback,foamed acid treatment and latent acid treatment are introduced into the production to slow down the acid-rock reaction speed,to increase the flowback rate of raffinate after acid treatment,and to slow down the ascent of water ratio of oil wells.