1. A system, comprising one or more processors; a non-transitory tangible computer-readable memory, the memory comprising: a drilling fluids expert system executable by the one or more processors and configured to provide one or more drilling fluids recommendations based on one or more inputs, the drilling fluids expert system comprising a drilling fluids Bayesian decision network (BDN) model, the drilling fluids BDN model comprising a temperature ranges uncertainty node configured to receive one or more temperature ranges from the one or more inputs, each of the one or more temperature ranges associated with a respective one or more temperature range probabilities; a formations uncertainty node configured to receive one or more formations from the one or more inputs, each of the one or more formations associated with a respective one or more formation probabilities; a potential hole problems uncertainty node dependent on the formations uncertainty node and configured to receive one or more potential hole problems from the one or more inputs and the one or more formation probabilities, each of the one or more potential hole problems associated with a respective one or more potential hole problem probabilities; a drilling fluids decision node configured to receive one or more drilling fluids from the one or more inputs; and a consequences node dependent on the temperature ranges uncertainty node, the potential hole problems uncertainty node, and the drilling fluids decision node and configured to output the one or more drilling fluids recommendations based on one or more Bayesian probabilities calculated from the one or more temperature ranges and the one more temperature range probabilities, the one or more potential hole problems and the one or more potential hole problem probabilities, and the one or more drilling fluids.