OICC Press International Journal of Nano Dimension 2228-5059 3 2 2024 03 01 Decreasing of water loss and mud cake thickness by CMC nanoparticles in mud drilling 10.7508/ijnd.2012.02.002 EN R. Saboori Nano Technology Research Institute, Shiraz University, Shiraz, Iran. S. Sabbaghi Nano Chemical Eng. Dep., Faculty of Advanced Technologies, Shiraz University, Shiraz, Iran. D. Mowla Chemical and Petroleum Eng. School, Shiraz University, Shiraz, Iran. A. Soltani South zagros oil and gas Production Company. Journal Article 2024 03 01 CMC polymer is used as an additive to decrease water loss and mud-cake-thickness in mud drilling. In this study, the effect of CMC and CMC nanoparticles on water loss and mud-cake-thickness in mud drilling is investigated. CMC nanoparticles are made by using of ball milling and their size is measured by Particle size analyzer. CMC and CMC nanoparticles which were prepared by Hamilton batch mixer and with certain percent suggested by API, were added to the water-based mud drilling. The amount of water loss and mud cake thickness was measured by filter press. It was found that adding CMC nanoparticles in comparison with conventional CMC resulted in desirable reduction of amount of water loss and mud cake thickness.