Design of integration test system for liquid nitrogen jet experiment.

Liquid nitrogen (LN) is considered as one of the potential fracturing fluids for unconventional oil/gas and geothermal reservoirs. In order to study the feasibility of the LN jet in fracturing operation, an integration test system is put forward in this paper. The system contains five units: the power system, the pure LN jet system, the abrasive LN jet system, the heat transfer system, and the control and data acquisition system. A series of experiments about rock breaking and heat transfer with the LN jet can be conducted by using this test system. The experiments in this paper demonstrate the reliability of the system for LN jet experiments. The results can provide theoretical supports for LN jet fracturing technology.