TP区裂缝孔洞型碳酸岩储层复合改造技术研究

TP区是塔河油田奥陶系碳酸盐岩油藏主力产油区块之一,在高温、高闭合压力条件下,常规酸压形成的酸蚀裂缝穿透距离受限且易发生闭合,酸压投产后表现出快速递减特征。通过实验研究开发了水力加砂压裂+酸压复合改造技术,前期利用冻胶携砂以提高人工裂缝远端导流能力,后期采用酸液刻蚀来提高近井导流能力和改造范围,从整体上提高人工裂缝导流能力及其保持率。水力加砂压裂+酸压复合改造技术在TP区现场实施6井次,建产率达到83.3%,累产油3.76×104 t,表明该技术在低品位裂缝孔洞型碳酸盐岩油藏具有较强的适应性。

Compound reconstruction technology of carbonate fracture pore-cave reservoir in TP area

TP area is one of the main oil-producing blocks of ordovician carbonate reservoir in Tahe oilfield.Under the condition of high temperature and high closure pressure,the penetration distance of acid corrosion crack caused by conventional acid pressure was limited and prone to closure,and showed a rapid decline characteristic after the production.Through experimental research,hydraulic sand fracturing+acid compound modification technology was developed.In early stage,by using gel carrying sand to improve the artificial fracture distal flow capacity,while in late stage,by using acid etching to improve flow capacity of near-wellbore and transform the scope,overall improving artificial fracture conductivity and retention rate.The technology was implemented 6 well times in TP area,with a yield of 83.3%and accumulated oil of3.76×104t,which indicates stronger adaptability in low grade pore-cave fracture carbonate reservoir.