新立油田低渗透砂岩油藏酸化技术

Acidizing technology of low permeability sandstone oil reservoir in Xinli Oilfield

酸化是油气田增产、注水井增注的重要措施。针对新立油田低孔、低渗,富含黏土矿物等特点,在充分了解储集层特征和伤害机理的基础上,通过室内实验,研究出了适合该区低孔低渗砂岩油藏的2套酸液配方体系,该体系具有较高的黏土矿物溶蚀率,具有很好的缓速性能,能够达到深部酸化,从而实现对油气藏的有效改造,达到增储上产的目的。

Acidizing is an important technique of oil-gas oilfield and water injection well stimulation. Aimed at the characteristics of low porosity, low permeability and rich clay minerals, and based on the reservoir characteristics and damage mechanism, two sets of acidizing fluid formulas systems which adapt to the low porosity, low permeability sandstone oil reservoir are developed through the laboratory analysis. These acidizing fluid systems have some advantages as follows： high clay minerals corrosion ratio, good retardation capability and favourable depth acidizing effect. Consequently, the oil-gas reservoir is recasted efficaciously and the aims of reserves and production increasing are achieved at last.