Buried under the oil source rocks under the influence of heat and pressure, plus other various chemical reaction after oil, oil stockpile produced in rocks formed oilfield between clearance.

The recovery of chemical reaction heat in its production can save a lot of energy source, decrease the cost of its production and improve production environment.

Uses: Oilfield well control operations, metal smelting and chemical industryes such as a heat source or heat radiation of high-temperature environments.