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胜利油田桩西潜山奥陶系以下地层孔洞-裂缝发育,地层压力系数较低(0.56～0.88),钻井过程中经常发生严重井漏问题。ZG10-G1井二开使用聚合物磺化防塌钻井液钻井;三开使用密度为1.03 g/cm3的聚合醇正电胶钻井液钻进,并采用MTC堵漏技术,同时配合钻井液充氮气技术,较好地解决了超深井的井漏问题。现场应用表明,MTC具有良好的触变性、稠化时间可调范围大、强度高,工艺简单,适合深井孔洞-缝隙低压漏失地层的堵漏;利用充氮钻井技术有效地解决了井漏问题,提高了钻井时效,充氮技术降低了当量循环密度,提高了环空返速和机械钻速;聚合醇正电胶防塌润滑钻井液具有良好的高温润滑性能,抗温可达180℃,满足了超深井的钻井液充氮气要求。
Shengli Oilfield Piles buried hill Ordovician below the formation of pores - fractures, formation pressure coefficient is low (0.56 ~ 0.88), drilling often serious problems of well leakage. ZG10-G1 wells were opened with polymer sulfonated anti-collapse drilling fluid drilling; the third open using a density of 1.03 g / cm3 polymer alcohol positive rubber drilling fluid drilling, and the use of MTC plugging technology, at the same time with the drilling fluid filled with nitrogen technology , Well solve the problem of leakage of ultra-deep well. Field application shows that MTC has good thixotropy, thickening time adjustable range, high strength, simple process, suitable for deep hole - the formation of low pressure gap leakage plugging; the use of nitrogen filling drilling technology to effectively solve the problem of leakage, Improve the drilling cycle time, nitrogen filling technology to reduce the equivalent cycle density, improve the annular velocity of return and ROP; polymer alcohol positive rubber anti-collapse lubrication drilling fluid has good high temperature lubrication performance, temperature up to 180 ℃, to meet the ultra-deep well Drilling fluid filled with nitrogen requirements.