摘要
川东北地区主要为海相碳酸盐岩气藏,基岩孔隙度和渗透率都普遍较低,储层具有埋藏深、温度高、产层厚、纵向岩性复杂、非均质性强、含酸性流体等复杂工程地质特征,气井实施压裂酸化作业必须解决高温深井所用酸液的缓速、缓蚀、降阻、降滤失、助排、粘温性、高温下的可靠转向性以及防二次沉淀等难题。酸液体系和酸化工艺需能提高酸液的有效作用距离,降低地层伤害,实现有效改造。在川东北地区采用解堵酸化、深度酸压工艺和混气酸压工艺可有效解除污染,延长酸压后有效酸蚀缝长,增强酸蚀裂缝导流能力。
In northwestern Sichuan Basin,there exist mainly marine carbonate gas reservoirs,which have lower porosity and permeability for basement rock.With acidic fluid inside,reservoirs are featured by deep burial depth,higher temperature,thick producing layer,complicatedly vertical lithology,and strong heterogeneity.During acid fracturing,some problems including the retard,corrosion inhibition,resistance reduction,fluid loss control,drainage aid,viscosity-temperature,reliable steering ability under high temperature and avoidance of secondary sediment of acid fluid used in deep wells with high temperature must be solved.The acid fluid system and acidizing technology should increase the effective distance and lower the formation damage to realize an improvement.Plugging-removal acidizing,deep and aerated acid-fracturing technologies are adopted in this area to remove pollution,extend the effective length of acid-corrosion fracture,and strengthen the fracture conductivity.
出处
《天然气勘探与开发》
2010年第4期66-72,共7页
Natural Gas Exploration and Development
关键词
川东北
海相碳酸盐岩
酸化压裂
渗透率
胶凝酸
胶束酸
northwestern Sichuan Basin,marine carbonates,acid fracturing,permeability,gelled acid,micellar acid
