Oil well gauging system and method of using the same

A well gauging system comprising:

• a test line component configured to receive a flow of produced fluid from a well, the test line component comprising a flow meter, a first pressure transmitter, and a temperature transmitter;
• a liquid sampling component comprising a sample extractor configured to collect a liquid sample from the flow of produced fluid flowing through the test line component, the liquid sampling component further comprising a collection vessel configured to receive the liquid sample, where the collection vessel comprises a fluid displacement piston, a liquid level transmitter, a second pressure transmitter and a collection vessel outlet;
• a full range water cut analyzer component configured to selectively receive either a fluid flow from the collection vessel outlet or to receive at least a portion of the flow of produced fluid flowing through the test line component, wherein the fluid from the collection vessel outlet is utilized to calibrate the full range water cut analyzer;
• and
• a lease water flush component hydraulically connected to the test line component and the liquid sampling component, wherein the lease water flush component is configured to periodically release a portion of lease water to flush the test line component or the liquid sampling component.