保护储层新型射孔液工艺技术及其在稠油油藏中的应用

A New Type of Perforation Fluid Technique for Formation Protection and Its Application in Heavy Reservoirs.

介绍了国内射孔液发展历程,分析了射孔作业可能产生的储层损害因素。通过在保护储层的射孔液体系中添加酸性螯合剂,将射孔液由原来中碱性转化为弱酸性,从而实现射孔液从保护储层型向改造储层型发展,即酸性射孔液不仅自身储层保护效果好,而且能够有效解除或部分解除钻井和固井作业时造成的储层损害,同时能够疏通储层孔喉,增强油气渗流能力。性能评价表明,酸性射孔液具有较强的抑制性,与储层岩石和流体配伍性好,低腐蚀性,对储层具有适度改造作用。

The experience of domestic perforation fluid development is introduced, and factors which might induce formation damage in perforation are analyzed. Acidic chelating agent is added into the perforation fluid to convert the neutrality or alkalinity of the conventional perforation fluid into acidity, by which reservoir protection is turned into reservoir improvement. The result shows that the acidic perforation fluid is effective for reservoir protection, moreover, it can effectively or partially avoid reservoir damage induced during early time operation including drilling and cementing. Property evaluation shows that acidic perforation fluid can clear the pore throat, enhance the percolating capacity of oil and gas, is compatible with rock and fluid of reservoir.