INVESTIGATION MUD COMPOSITIONS FOR DRILLING MUDSTONE AND PREVENTING FORMATION OF SEALS
The article is dedicated to problems of drilling wells in mudstone rocks. Application of water based drilling muds at drilling in mudstone rocks leads to aquation of rocks and their sticking on a bit and the elements of drilling string. As a result probability of seals formation on a bit rises up and a rate of penetration decreases in 2-3 times. An addition of special reagents into drilling mud, which prevent formation of seals and improve drillability of plastic ores, is a correct decision. Analysis of theoretical and practical research shows that application of polymer drilling muds with addings of surfactants, like sulphanol, leads to rising of drilling efficiency in mudstone rocks.