Oil base fluids pose many hazards to the environment. The core of these fluids is gas oils, which are mixed with other chemicals to provide the proper rheology of a drilling fluid. During the drilling of an oil well, drilling waste may contaminate both the well and the surface, so that large volumes of hazardous chemicals enter the aquifers from the surface. In this study, we investigate the feasibility of using hydrogels for the purpose of making an environmentally friendly aqueous base fluid and replacing it with an oil base fluid in one of the oil fields located in the south of the country, The drilling fluid must have all the requirements for remove cuttings, creating the proper hydrostatic pressure for the well, maintain well bore stability, preventing shale activation. First, the rheological parameters of the mud fluid were measured without the presence of hydrogels, and then we used different amounts of this hydrogel in the mud production and again, we measured the drilling mud parameters.