Apparatus, systems and methods for oil and gas operations

A method of sampling fluid from a flow system in a subsea oil and gas installation, the method comprising:

• providing a sampling circuit;
• providing a valve apparatus comprising:
• an inlet for production flow from the subsea oil and gas production installation, and an outlet for production flow;
• a first flow control valve disposed between the inlet and the outlet;
• first and second flow lines in communication with the sampling circuit and disposed between the inlet and the first flow control valve and the outlet and the first flow control valve, respectively;
• and
• a second flow control valve disposed in the first or second flow line;
• partially closing the first flow control valve of the valve apparatus to create a pressure differential between the first and second flow lines and thereby create a turbulent and/or mixed flow of a production fluid and drive production fluid into the sampling circuit at a first flow rate;
• and
• partially closing the second flow control valve of the valve apparatus to regulate the turbulent and/or mixed flow of production fluid to a sampling flow rate through the sampling circuit, the sampling flow rate being less than the first flow rate.