D rilling mud is one of the most important factors in a drilling operation. The thingthat needs to be considered in the drilling mud as a support for the success of this drillingoperation is the physical properties of the drilling mud.CMC, Starch, Duranex are additives that are useful as a control for the filtrate of thesludge. Where this additive is able to reduce the amount of filtrate that occurs. It is knownthat if there is excess mud filtrate, it will occur around the hole and result in a smallerdiameter of the well. On the other hand, CMC, starch, duranex affect other physicalproperties such as viscosity density and mud rheology. The mud filtrate that enters theformation causes a thickening of the mud cake which results in a smaller diameter of thewell bore at the depth where the mud cake settles. The use of CMC, Starch, Duranexadditives can certainly reduce the filtrate from the mud, but of course the addition of CMC,Starch, Duranex additives to the drilling mud will affect other physical properties such asviscosity, density, and mud rheology. In this research, the addition of additives will beCMC, starch and duranex additives in the number of additives that vary. With varyingamounts and weights, after which the physical properties of the freshwater-based mud witha mixture of CMC, Starch, Duranex additives will be analyzed , and the results will becompared.In the results of the research that has been carried out, it can be seen that the addition of 10grams (0.025% by weight) of CMC additive at room temperature produces a very highviscosity mud, which is 48.64 ml/sec. This can cause a decrease in the filtration value to be large, namely 6.4 ml. and does not meet the specified standards/specifications. While theuse of Strach additives in the mud at the same temperature can still be used, because of theimpact of the addition of Strach additives, the viscosity value is still within the drillingmud standard, which is 33.1. For durian additives, it has a small viscosity of 1.21 ml/s andcauses a loss of filtration to 6.41 ml/s at room temperature.sifat-sifat fisik dari lumpur berbahan dasar air tawar dengan campuran zat aditifCmc,starch,duranex tersebut dan dibandingkan hasilnya.Pada hasil penelitian yang telah dilakukan, terlihat bahwa penambahan 10 gram(0.025% berat) aditif CMC pada suhu kamar menghasilkan lumpur dengan viskositassangat tinggi, yaitu 48.64 ml/sec. Hal ini dapat menyebabkan nilai dari filtration lossmenjadi besar yaitu 6,4 ml/sec. dan tidak memenuhi standar/spesifikasi yang ditentukan.Sedangkan pada penggunaan zat aditif Strach di lumpur pada suhu yang sama ini masihdapat digunakan,karena dampak dari penambahan zat aditif Srtach ini nilai viskositas yangmasih dalam standar lumpur pemboran yaitu 33,1 ml/sec yang sebelumnya 18 ml/sec.Untuk zat additive duranex mempunyai viscositas kecil yaitu 1,21 ml/sec danmenyebabkan filtration loss menjadi 6,41 ml/sec di suhu ruangan dan masih dalamspesfikasi yang telah di tentukan