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欠平衡钻井又称为负压钻井。欠平衡钻井始于十九世纪50年代。目前,欠平衡钻井在国内外应用井数逐年增加,不掌握欠平衡钻井技术,在国际、国内市场上就会失去许多机会。 欠平衡钻井不同于边喷边钻,欠平衡钻井液压力、井下和地面循环系统都是精心设计和有效控制的。对产层流体流入井筒的压差必须严格控制,否则压差过大,会导致井筒复杂,压差过小,欠平衡显示不出来。
Underbalanced drilling, also known as negative pressure drilling. Underbalanced drilling began in the 1850s. At present, the number of underbalanced drilling wells applied at home and abroad has been increasing year by year, and the underbalanced drilling technology is not mastered. Therefore, many opportunities will be lost in the international and domestic markets. Underbalanced drilling is different from sidebore drilling, underbalanced drilling hydraulic pressure, downhole and ground circulation systems are carefully designed and effectively controlled. The pressure difference between the fluid flowing into the wellbore and the wellbore must be strictly controlled, otherwise the pressure difference will be too large and the wellbore will be complicated and the pressure drop will be too small to show the balance.