Abstract: The present invention includes a first separation vessel disposed above a second vessel. The first separation vessel has a plurality of inlets, a removable cyclone module, an upper outlet, and a lower outlet coupled to the second vessel. The removable cyclone module includes at least one cyclonic separator configured to separate at least a portion of particulate matter from the well production and to discharge such matter from the lower outlet, and to separate at least a portion of the liquid and gases in the well production and discharge such fluid from the upper outlet. The second vessel may include an inner surface with an inlet disposed on a top portion of the vessel, and an outlet disposed on a bottom portion of the vessel. The produced well fluids from a wellhead are directed to the plurality of inlets in the first separation vessel selectively via a manifold. The manifold has multiple valves, either manually operated or actuated via hydraulic, pneumatic, or electric actuators.