Publisher Summary This chapter takes a look at some operational aspects related to solids production. When hydrocarbons are produced from a reservoir, solid particles sometimes follow the reservoir fluid into the well. This unintended byproduct of the hydrocarbon production is called solids production. Mechanisms that may cause sand production are then discussed in the chapter, followed by discussions on how to predict sand production. Chalk production is discussed more briefly, which reflects that the public literature is rather limited on this subject. Moreover, methods to control solids production involves additional costs and usually results in the reduced production, such that in later years a more relaxed tolerance for solids production is sometimes considered. When dealing with heavy oil, solids production is even deliberately provoked in some cases.