摘要
本文在海拉尔油田地质特征研究的基础上,通过地层伤害因素分析、酸岩反应机理研究、酸化工艺模拟以及酸化工艺优化设计的研究,研究了一套适合于海拉尔油田酸化增产(注)的酸化技术。研究发现兴安岭群粘土含量高、敏感性强是造成该油田注水开发效果差的主要原因,强水敏和强速敏造成粘土膨胀、分散和运移,堵塞地层；酸岩反应机理研究表明：兴安岭群地层存在较强的敏感性,常规酸化技术对地层造成较大的伤害；研究了XA-1低伤害酸体系可有效提高地层渗透率,对地层伤害小；建立了分段加压长岩心室内模拟实验的方法,模拟酸化半径可达2m以上；以地质参数和酸液性能指标为基础,建立了一套工艺参数优化设计的数学模型,保证了酸化处理的经济性和有效性；现场进行了11口井的现场试验,取得显著的社会和经济效益。
This paper, based on the research of the geological characteristics of Hailaer Oilfield, has carried out a series of work on strata damage factor analysis, acid-rock reaction mechanism, acidizing process simulation and acidizing process optimization design, and finally formed a suitable technology for hailaer oilfield acidizing. Strata damage factor analysis shows that the high clay content and strong sensitivity are the main reason of the poor injection of XingAnLing group.The strong water sensitivity and speed sensitivity can lead to the swelling,dispersing and migrating of the clay minerals to cause the strata blocking; Acid-rock reaction mechanism research shows that the strata of XingAnLing Group have strong sensitivity, and conventional acidizing technique may cause formation damage. So this paper also presents a new developed acid fluid (XA-1) which can effectively improve permeability and cause no damage to the strata. The acidizing radius reaches more than 2m in laboratory simulation test through establishing a sectional pressurized long core method. Based on the geological parameters and acid performance index, a set of process parameters optimization mathematical model has been established, which ensures the efficiency and validity of acidizing treatment. This technology has been applied on 11 wells in field test, and has achieved remarkable economic and social benefits.
引文
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