强渗透缓速酸液体系研究与评价

Study and Evaluation of Highly Permeable Retarded Acids

在碳酸盐岩储层的酸化压裂改造过程中,酸液质量的优劣直接影响着最终的改造效果。目前,常用的酸液体系存在渗透性差、腐蚀高、缓速效果不佳等问题。通过室内实验,研选出了适宜的复合有机缓速酸主体酸液以及酸用降阻剂、缓蚀剂和铁离子稳定剂等助剂,开发出了一套适合碳酸盐岩储层的新型强渗透缓速酸液体系。实验室综合评价结果表明,该强渗透缓速酸液体系具有良好的缓速性能、较低的腐蚀速率以及更优的渗透性能。此项研究对碳酸盐岩油藏储量的充分动用及高效开发具有重要的理论指导意义和实际应用价值。

In acid fracturing carbonate reservoirs,the quality of the acid directly affects the quality of the stimulation.Problems with the acids presently used in fracturing operation include low permeability,high corrosion rate and poor retarding performance.To solve these problems,an acid used as the main component of a compound organic retarded acids,a drag reducer for acidizing operation,a corrosion inhibitor and an iron ion stabilizer were selected to formulate a new high permeability retarded acid suitable for use in acidizing carbonate reservoirs.Laboratory experimental results showed that this new retarded acid has good retarding performance,low corrosion rate and better permeating ability.This study is of theoretical guiding significance and practical application value for fully and efficiently developing carbonate reservoirs.