mud properties

READ: Drilling operations need certain amount of agents whose available content and ratio, especially that of anti-sloughing agents, should be well preserved, and adequate anti-high-temperature materials to avoid high temperature thickening or thinning and other agent failures. Drilling operations need certain amount of agents whose available content and ratio, especially that of anti-sloughing agents, should be well preserved, and adequate anti-high-temperature materials to avoid high temperature thickening or thinning and other agent failures, as well as larger amount of lubricating materials to keep frictional resistance within limits and to impart property characteristics needed for drilling fields. Proper mud density is of high necessity since only it can well control formation pressu