From Silverson Machines, Inc.
Drilling fluids (or drilling muds) have several functions, including carrying bore cuttings to the surface, cooling and lubricating the drill "string" and controlling subsurface pressures.
A simple water based mud for horizontal drilling and some vertical operations consists of clay (bentonite) dispersed into water. In deep wells where the potential pressure of gas/oil dictates a heavier product, inert solids such as barite or hematite are added to weight the bentonite suspension. Muds based on a water/oil emulsion (known as "inverts") are used for drilling deeper wells as they have better lubricating properties and are more temperature stable than water based muds. Traditionally diesel was used for inverts, however environmental concerns are leading to the use of low toxicity mineral oils, synthetics and esters.Waste management practices such as re-injection of fluid into redundant wells or transport to shore for remediation are increasing. Research is also being carried out to improve water based products.
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Topics of Interest
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