海上油田层内生成CO_(2)工艺分流多氢酸解堵技术的研究  

Research of Blocking Removal Technology of Shunting Multi-hydrogen acid with Intralayer CO_(2) Generation in Offshore Oil Fields

作　　者：张浩 张宁 王传军 徐文娟 刘常清 ZHANG Hao;ZHANG Ning;WANG Chuanjun;XU Wenjuan;LIU Changqing(Tianjin Branch,CNOOC(China)Ltd.,Tianjin 300450,China)

机构地区：[1]中海石油(中国)有限公司天津分公司,天津300459

出　　处：《海洋石油》2024年第3期82-87,共6页Offshore Oil

摘　　要：针对渤海油田部分储层非均质性强、常规笼统酸化无法有效启动低渗层的问题,提出一种层内生成CO_(2)分流多氢酸解堵技术,综合利用封堵性能评价、理化性能评价、酸液性能评价及岩心驱替实验,研究了层内生成CO_(2)体系的封堵能力和多氢酸解堵体系的解堵能力。研究结果表明:渗透率级差小于7.8时,层内生成CO_(2)体系生成的CO_(2)泡沫具有良好的封堵效果,可有效封堵高渗层,提高后续酸液进入低渗层的比例。多氢酸解堵体系沥青质溶解速率为7.2755 mg/(mL·min)、溶蜡速率为0.599 mg/(mL·min),酸化后岩心渗透率恢复率为200%。矿场试验结果表明措施后油井产液量增幅达到90%。该技术施工简单、使用设备少、对储层无伤害,对海上油田解堵具有很好的借鉴意义。Aiming at problems of strong heterogeneity in part of Bohai Oilfield reservoir and ineffectively starting the low permeability layer by general acidizing,an blocking removal technology of shunting multi-hydrogen acid with intralayer CO_(2) generation was proposed.The plugging capacity of intralayer CO_(2) generation and the removing blockage of multi-hydrogen acid system were researched by plugging performance evaluation,physical and chemical properties evaluation,acid performance evaluation and core displacement experiments.The results showed that the CO_(2) foam generated by the intralayer CO_(2) system could effectively seal the high permeability layer when the permeability ratio was less than 7.8,which increased the proportion of subsequent acid entering into the low permeability layer.The performance evaluation results of multi-hydrogen acid system showed that the dissolution rate of asphalt was 7.2755 mg/(mL·min)and the dissolution rate of wax was 0.599 mg/(mL·min).And the core permeability recovery rate is 200%after acidizing.The field test results showed that the technology could increase the liquid production of the oil well by 90%after the measure.The technology is simple in construction and needed less equipment,which is no damage to the reservoir.It is a good removing blockage reference for offshore oilfield.

关 键 词：海上油层 层内生成CO_(2) 分流酸化 解堵技术 

分 类 号：TE52[石油与天然气工程—油气田开发工程]