drilling mud
drilling fluid

When the rams are retracted, there is a passage for the drilling mud.

The driller will watch for gas levels coming out of the hole, how much drilling mud is going in, and other information.

Rather than returning to the surface, the drilling mud was escaping into fractures that had formed in the rock at the bottom of the hole.

The drilling mud was followed by a large quantity of oil and gas at an increasing flow rate.

The main functions of a drilling mud can be summarized as follows:

The first line of defense is pouring drilling mud down the well.

This generally works because the cement has much higher density than the drilling mud that it is displacing.

The heavy drilling mud in the pipes initially held down the gas of the leaking well.

He says he believes such a reservoir swallowed the drilling mud.

BP announces plan to force feed heavy drilling mud in a project called "top kill".