D Drilling mud is an important material in a drilling operation, as it can affect the safety, efficiency, speed of drilling and drilling cost. Drilling mud to function properly, the the sludge must always be controlled nature – its physical properties, which amount others consist of: mud weight, viscosity, so that power (strenght gel) and the rate of strainer. Aspects of the formation to be drilled as the condition of formation, rock formations and the content of the fluid contained in the formation also need to be observed. Based on the analysis in the laboratory test results, use low solids mud. The use of low solids sludge is often used in drilling operations with a fairly high succsess rate. With the benefits contained in the mud then the modification of sludge is becoming a viable type of drilling fluid used. The conclusion was found that increasing the temperature of formation of the properties – the physical properties of low solids mud tends to decrease as : mud density , mud viscosity , plastic viscosity, gel strenght and pHmeters. Contrary to nature – the physical properties of drilling mud as the API water loss and mud cake. Properties – the physical properties of the mud tends to increase. And in the presence of calcium causes the rate of contamination srainer and gel strength increased increased dramatically.