When drilling in sand and other soft sediments below the water table (flowing sand) a hydrostatic head of at least 3 meters (10') is needed to guard against borehole collapse.ģ.Drilling mud seals the borehole wall with a thin ''wall cake". The height of the column of drilling mud above the water table is called the ''hydrostatic head''. It does this by increasing the viscosity of the drilling fluid (we'll discuss this in more detail later).Ģ.Drilling mud maintains hydrostatic pressure against the borehole wall, keeping it from collapsing. This is important because otherwise cuttings will collect at the bottom of the borehole and lock up the drill bit. Good drilling mud does four important things:ġ.Drilling mud helps remove cuttings from the bore-hole.
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Part 3- ''Using Mud'' gives practical advice on how to properly use drilling mud. Part 2- ''Mixing Mud'' guides you through the steps to make good drilling mud and how to maximize bentonite properties Part 1- ''The Role of Mud'' explains why drilling mud is important There are three sections on drilling mud: This is especially true when working with a low-power drilling rig like the LS200 or LS300.ĭrilling without good bentonite properties and proper mud may limit the depth that can be achieved, greatly increase the risk of getting the drill bit stuck, make it difficult to properly develop the well, and reduce the yield of the well. Your skill in forming and maintaining a proper drilling mud and maximixing bentonite properties will determine your long-term success at completing good water wells with a mud-rotary drill rig.
In mud rotary drilling, the mud you mix plays several roles and is vitally important in the successful drilling and completion of a well.
These properties make this material very useful in the process of mud rotary borehole drilling. The viscosity (runniness) of the slurry can be manipulated by adding water to make it thin or adding more bentonite to make it thicker. It creates a very viscous, slippery, almost gel-like slurry that acts as a lubricant. Do not think that any old dirt will do the job.īentonite properties include the ability to expand to ten times its volume when completely hydrated. Note: The content on this page has been adapted from publications of Lifewater International, authored by Fred Proby.īut in well drilling, the term ''drilling mud'' means a carefully engineered drilling fluid. Bentonite is An Aluminum Silicate Clay That Is Used to Make Drilling Fluid in the Process of Mud Rotary Drilling of Water Wellsīentonite properties make it very useful in mud rotary drilling? The word ''mud'' - in common everyday usage - simply means wet dirt.
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