This can occur in a variety of contexts, including the production and transport of oil and natural gas, the refining of petroleum products, and the storage and transport of chemicals.
For the transportation of crude oil in a pipeline, wax can deposit on to the inner surface of the pipeline, reducing the area for fluid to flow and increasing the pressure requirement for fluid to flow.
This phenomenon is governed by the thermodynamic equilibrium of wax in oil.
For wax deposition to occur, the solid surface temperature for wax to be deposited on must be lower than the temperature of waxy oil solution.
You can help Wikipedia by expanding it.This article about geological processes is a stub.