超平衡 meaning in English

overbalance

This paper describes the con - cept of udb , together with its advantages and disad - vantages , and demonstrates the formation damagemechanism during ubd , e . g . , the lack of filter cakeprotection , temporary over - balanced condition , pol - ishing effect and surface damage caused by frictionbetween bit and hole wall and poor cooling , and otherdamages , etc
介绍了欠平衡钻井的概念以及优点和缺点，阐述了欠平衡钻井对地层的损害机理为由于缺少起保护作用的滤饼，临时的超平衡造成对地层的损害；天然渗析效应；抛光、表面损害以及其它损害。