大庆高台子油层闭合酸化技术

ENCLOSED ACIDIZING TECHNOLOGY IN GAOTAIZI RESERVOIR IN DAQING

闭合酸化技术是碳酸盐岩酸化压裂后 ,对人工裂缝进行再改造的补救性措施 ,通过解除对裂缝造成的伤害 ,提高裂缝的导流能力 ,增大扫油效率 ,提高油井产量。针对大庆西部高台子复杂岩性地层的特征及水力支撑压裂情况 ,进行了措施方案分析 ,扩大了常规闭合酸化技术的应用范围 ,提出了在水力支撑裂缝中进行酸化解堵的新观点 ,研究了适应该地层的压裂液配方和酸化解堵剂 ,现场进行 2口井试验 ,闭合酸化效果较水力压裂效果明显 ,产量平均增加 5 0

Closure acidizing is usually used in carbonate reservoir, which is a kind of remedy method to the formed acid etched fracture. Because the damage by the partially solved particles to the fracture is removed, the acid etched fracture conductivity and its efficiency are enhanced in order to finally enhance the oil production. The study, which to the feature of flexile mineralogical composition and the past hydraulic fracture of the Gaotaizi layer in the western Daqing Oilfield, analyzed the stimulation project, enlarged the application extent of the closure acidizing technology which gave the novel opinion about acidizing removed the damage by the fracture fluid in the hydraulic fracture, and study the fracture fluid and the acidizing fluid system formulations suit to the reservoir. Two oil wells have been stimulated in the closure acidizing technology, and the oil production after closure acidizing is higher 50% than that of hydraulic fracture. It is advised to further stimulate other oil wells to test this method and technology.