这些技术被称为重复压裂、重复进入、重复完井和其他重复术语的变体。无论名称如何，目的都是一样的——重新进入现有的、正在衰退的油井，以获取更多的岩石，并从中抽出新的生命——而且这对运营商来说正成为一种越来越常见的做法。 

“捶打并祈祷”

重复压裂主要有两种类型：硬头式和水泥衬管式。第一种类型定向性较差，因此成本较低。第二种类型主要用于岩石未触及较多的较老井。 

They are called re-fracs, re-entries, re-completions and other variations on re-peat terms. Whatever the name, the purpose is the same—to re-enter an existing and declining well to access more rock and pump new life out of it—and it is becoming a much more common practice for operators. 

‘Pump and pray'

There are two main types of refracs: bullhead and cemented liner. The first is less directed and therefore less costly. The second is used mainly in older wells with more untouched rock.