Formation pollution made by cement squeeze can be removed by the measures of perforation and acidizing and so on.

对于挤水泥堵水造成的地层污染，可以通过射孔、酸化等措施加以清除。

youdao

It is thought that the treatment can release formation pollution and communicate crack which provides a liable basis for developing and exploiting at next step of this district.

认为酸化措施解除地层污染并沟通了地层的裂缝，为该地区的下步勘探开发提供了可靠依据。

youdao

The permeability increased a little in the reservoirs with poor physical property. And the permeability even decreased in the poorest reservoirs for formation pollution and plugging.

物性差的储层，渗透率增加幅度小，更差储层由于地层污染、堵塞，甚至存在渗透率降低现象。

youdao

They are encouraging drillers to use tainted coal mine water to hydraulically fracture gas wells in the Marcellus Shale formation, with the twin goals of diverting pollution from streams and rivers that now run orange with mine drainage and reducing the drillers' reliance on fresh sources of water.

WSJ: Pa. pushes drillers to frack with coal mine water