Accurately measuring the level of drilling fluid flow through the mud return line is crucial for monitoring the drilling fluid balance in the wellbore. While several different types of sensors have historically been used for measuring the flow rate of drilling fluid through the mud return line, they have proven to be problematic for drillers and require frequent maintenance.

• Paddle flowmeters are damaged by rocks and cuttings over time, with the bowl eventually ending up in the shakers. As a result, mud loggers do not have verification on how the paddle is performing because the paddle arm still points in a downwards position and floats with the mud and seawater stream.
• Additionally no-contact radar-level sensors suffer from condensation of mud and seawater.

Created and tested over time on offshore rigs, the Cameron mud flow sensor combats moisture and condensation by blowing compressed air at a minimum pressure of 2 bar (self-regulated) from its nozzle and functions well without regular maintenance.

Advantages

• New interface is easily mounted; replaces existing setup by using the flange welded on the pipe.
• Assembly can be built in any location where mud flow sensors and paddles are located.
• Air pressure is self-regulated.
• Autocalibration of sensors provides increased reliability while minimizing maintenance.