螯合酸完井液体系的研究及应用

Study and Application of a Completion Fluid Containing Acid Chelating Agents

针对渤中某油田的储层和原油特性,研发了一种螯合酸完井液体系。室内实验评价结果表明,螯合酸完井液在60℃下对渤中某油田油砂溶蚀率为3.62%、与渤中某油田油砂按质量比为1︰1反应72 h后p H值为6.98,防膨率达到88.7%,对渤中某油田岩心渗透率恢复值达到127.6%,对铁离子螯合能力为110.15 mg/g,对钙离子螯合能力为878.3 mg/m L,体系的腐蚀速率能够满足现场要求。经渤中某油田应用表明,螯合酸完井液作为射孔液取得了增产效果。

A completion fluid treated with acid chelating agents has been specially developed for use in Bozhong. In laboratory studies, the percent solution rate of the completion fluid to the oil sand taken from Bozhong was 3.62% at 60 ℃. At a mass ratio of 1 ： 1, reaction of the completion fluid and the oil sand for 72 hours resulted in a pH of 6.98. Percent reduction of swelling of the 28-2S sand cores was 88.7%. In permeability experiments, the permeability return of the oil sand tested with the completion fluid was 127.6%. The chelating capacity of the completion fluid was 110.15 mg/g to ferric ions, and 878.3 mg/mL to calcium ions. The corrosion rate of the completion fluid satisfied the needs for field operation. Oil production rate has been enhanced using the completion fluid as a perforation fluid.