长庆低渗油藏暂堵酸化技术研究

Temporary Plugging Acidizing Technology for Low Permeability Reservoirs in Changqing Oilfield.

根据长庆靖安油田低渗、非均质严重、酸化结果往往不理想的特点。研制出了一种暂堵剂ZDJ-1,对其油溶性、酸溶性及分散性进行了评价,考查了暂堵剂对不同渗透率岩心的暂堵效率和分流效果。结果表明,ZDJ-1的油溶性好,在酸液中表现为惰性,在岩心酸化时能有效地暂堵分流,使低渗透岩心吸酸率增大,提高了酸化效果。现场实施暂堵酸化技术26井次,成功率为90%,取得了较好的效果。

A temporary plugging agent,ZDJ-1,was developed for use in Block Jing'an in Changqing where reservoir formations have low permeability and serious heterogeneity.Acidizing in this area was unsatisfac- tory.Laboratory study showed that ZDJ-1 has good oil solubility and is inert in liquid acids.ZDJ-1 can ef- fectively plug the cores in acidizing,thus increasing the acid absorption of low permeability cores.Applica- tion of ZDJ-1 in 26 wells gave birth to a success rate of 90%.