T The drilling mud is one very important part in a drilling operation. With increasing depth of the well is to be achieved in the drilling, the problem to be faced is due to the higher temperature geothermal gradient and contamination can occur if in the process of drilling through the layer that can change the physical properties of the drilling mud. Where the purpose of planning the mud is to obtain optimal results and effective at the time of drilling operations. This thesis aims to investigate the physical properties of the sludge oil-based biodiesel to the influence of the addition of calcium and elevated temperature between 120 ° F, 160 ° F, 200 ° F to 240 ° F. The physical properties of biodiesel oil sludge under study at the Laboratory of Drilling and Production Engineering from Trisakti University is the specific gravity, viscosity, yield point, apparent viscosity, plastic viscosity, gel strength, the rate of filtrate, mud cake, liquid level, solids content, and electrical stability. This thesis aims to investigate the physical properties of the sludge oil-based biodiesel to the influence of the addition of calcium and elevated temperature between 120 ° F, 160 ° F, 200 ° F to 240 ° F. The physical properties of biodiesel oil sludge under study at the Laboratory of Drilling and Production Engineering from Trisakti University is the specific gravity, viscosity, yield point, apparent viscosity, plastic viscosity, gel strength, the rate of filtrate, mud cake, liquid level, solids content, and electrical stability. Based on laboratory test analysis showed that with increasing temperature the oil sludge biodiesel is added the calcium material physical properties of biodiesel oil sludge decreased as density, viscosity, plastic viscosity, gel strenght and power stability. In contrast to the physical properties such as the rate of drilling mud filtrate and mud cake to rise