醇醚型高效解堵剂的制备与矿场应用

Preparation and Field Application of Efficient Plug Removal Agent with Alcohol Ether Type

为解除渤海油田在开发中后期由于石蜡、沥青等有机物沉淀造成的油井堵塞,以复合油溶性有机溶剂、醇醚型表面活性剂及渗透剂等制得XL-1高效解堵剂。通过3组正交实验考察各物质加量对洗油率的影响,确定XL-1的最佳配方,研究XL-1对石蜡和沥青的溶蚀效果,并在渤海油田沙河街组58-5油井进行了现场应用。结果表明,当醇醚型表面活性剂、复合油溶性有机溶剂、2-甲基-2,4-戊二醇质量比为3∶7∶0.5时,XL-1解堵剂对油污的洗油效果最好,洗油率为98%。对石蜡和沥青的溶蚀效果较好,溶蚀率分别为90%和40%。在58-5油井注入XL-1解堵剂后,储层压降幅度达到23%,解堵效果较好。XL-1醇醚型解堵剂可用于解除低渗油田石蜡、沥青等沉积造成的有机堵塞。图2表3参29。

In order to remove the plugging of oil well caused by the precipitation of paraffins,asphalts,and other organic substances in the middle and late development of Bohai oilfield,high efficient plug removal agent XL-1 was prepared by using compound oil soluble organic solvent,alcohol ether surfactant and penetrating agent.Three sets of orthogonal control experiments were carried out to investigate the effect of various reagents dosages on the oil washing rate,which could determine the best formula of XL-1 and study the dissolution effect of XL-1 on paraffin and asphaltene.Finally,field application was carried out in 58-5 well of Shahejie formation in Bohai oilfield.The results showed that when the mass ratio of alcohol ether surfactant,compound oil soluble organic solvent and 2-methyl-2,4-pentanediol was 3∶7∶0.5,the oil washing effect of XL-1 on oil pollution was the best with 98%oil washing rate.It had good dissolution effect on paraffin and asphalt,and the dissolution rate was 90%and 40%,respectively.After injection of XL-1 in 58-5 well,the drop of the formation pressure was up to 23%,indicating good plugging removal effect.Alcohol ether type plug removal agent XL-1 could be used to remove organic plugging caused by the deposition of paraffins and asphalts in low permeability oilfield.