The Job Of A Mud Engineer On An Oil Rig

When you hear the term mud engineer what comes to mind? Perhaps you think of a civil engineer that designs roads through muddy areas?

The term mud engineer or "mud man" refers to a drilling fluids technician on a drilling rig. He does not have an engineering degree but instead has taken classes at a "mud school" which can last as long as three months.

The mud engineer's duties are to stay on the rig site (usually) and constantly monitor and readjust the properties and weight of the drilling fluid or "mud".

The mud or drilling fluid is what lubricates the drill bit, keeps it cool, flushes cuttings from the hole being drilled and holds back underground pressure from dangerous zones that contain natural gas.

If the mud weight is not heavy enough or is "underbalanced" a blowout can occur, burning down the rig and casing an out of control wild well and loss of life.

If the mud or drilling fluid is too heavy it can flush out into the formation causing a "lost circulation" situation which can ruin the well being drilled.

The mud engineer adds weight to the drilling fluid or mud by means of adding the mineral barite. Barite is a heavy mineral that mixes with oil and water based muds. The weight of the drilling fluid is measured in PPG or pounds per gallon. Ten pound mud would weight ten pounds to the gallon.

The mud enginner uses a set of scales to constantly weight the mud and make sure that it is heavy enough for the pressures that are expected at a certain depth.

An influx of gas or water, mixing with the drilling mud can cause it to suddenly get light, causing an under-balanced situation so the process of monitoring the weight of the mud is constant during the drilling of the well.

Persons wishing to become mud engineers should have a good background in math and science, be able bodied and willing to travel. For those wishing to try this interesting career I recommend the book "A Nontechnical Guide to Geology, Exploration, and Production" to further understand the role of a mud engineer as well as other functions on the rig.