Multi-phase pump with cooled liquid reservoir

A multiphase pump configured to pump a process fluid having liquid and gas components from an inlet to an outlet, the process fluid having an inlet pressure at the inlet and having an outlet pressure at the outlet, the multiphase pump comprising:

• a liquid reservoir configured to retain process liquid extracted from the process fluid as it flows through the multiphase pump, and to communicate the retained process liquid to a suction chamber of the multiphase pump during gas slugs, said suction chamber being a region within the multiphase pump where a pressure of the process fluid is substantially equal to the inlet pressure, the liquid reservoir being configured to retain said process liquid during said gas slugs, thereby ensuring that a gas seal is maintained within the pump;
• and
• a cooling loop in thermal communication with the process liquid in the liquid reservoir and configured to remove heat from the process liquid in the liquid reservoir by extracting a cooling liquid directly from within the liquid reservoir into the cooling loop and circulating the cooling liquid from the liquid reservoir to a cooling apparatus that is exterior to the liquid reservoir, and from the cooling apparatus back to the multiphase pump, the cooling loop being configured to circulate the cooling liquid during and throughout said gas slugs.