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酸化是油气井增产、注入井增注的又一项有效的措施。其原理是通过酸液对岩石胶结物或地层孔隙、裂缝内堵塞物等的溶解和溶蚀作用,恢复或提高地层孔隙和裂缝的渗透性,从而达到油气井增产、注入井增注的目的。酸化按照工艺的不同可分为酸洗、基质酸化和压裂酸化(也称酸压)三大类。本文主要介绍碳酸盐岩和砂岩油气层的酸化原理、工艺方法、酸化用酸和添加剂的特性。并且将该酸化工艺在甘谷驿油田地区进行了应用,施工后增产十分明显,取得了良好的效果。
Acidification is another effective measure for stimulation of oil and gas wells and injection of injection wells. The principle is to recover or improve the permeability of formation pores and fractures through the dissolution and dissolution of rock cements or formation porosity, and plugging materials in the fracture so as to achieve the purpose of increasing the production of oil and gas wells and injecting the injection wells. Acidification in accordance with the different process can be divided into pickling, matrix acidification and fracturing acidification (also known as acid pressure) three categories. This paper mainly introduces the theory of acidification of carbonate and sandstone reservoirs, the process method, the characteristics of acidification and additives. And the acidification process in the Gangu Yi oilfield has been applied, after the construction yield is very obvious, and achieved good results.