Low Permeability Reservoir Pollution Prevention Technology Research And Application

Pollution damage of low permeability reservoir and its influence to the oil and gas Wells dynamic oil and gas Wells in the production process has been an important research topic, it is on how to effectively and reasonably to develop this kind of oil and gas resources play a vital role. This project is mainly aimed at the reservoir protection of low permeability reservoir of jilin oilfield technology research. Comprehensive damage mechanism of the experiments show that the main sandstone reservoir damage way as the water locking damage,cracks and tuff core main damage way as the solid phase damage. Gas reservoir damage of water phase trapping damage is bigger, FS drop weight method is used to optimizing the surfactant as the preferred drilling fluid additives, reduce the water phase trap damage of drilling fluid suitable adding concentration was 0.2%. After adding surface active agent to improve the original drilling fluid system, gas reservoir core permeability damage recovery value of 87.80% on average, the FS can effectively reduce the water phase trap damage rate of the gas reservoir of the reservoir, has the good effect of water phase trapping damage.