The combination EP (Extreme Pressure) and Lubricity Tester is a high-quality instrument designed to measure the lubricating quality of drilling fluids, provide data to evaluate the type and quantity of lubricating additives that may be required, and predict wear rates of mechanical parts in known fluid systems.
This equipment is used for the evaluation of oil or water based drilling muds or fluids. Since evaluation of the various lubricating materials in the various types and quality of drilling fluid cannot realistically be done on the drilling rig, a drilling fluid lubricity test was designed to simulate the torque and drag produced by a given drilling fluid downhole. The tester approximates the speed of rotation of the drill pipe and the pressure with which the pipe bears against the wall of the hole where the friction is generated.
The EP tests are performed by applying a measured torque with a torque arm to a torque-sensitive, rotating bearing cup. This provides a means of testing lubrication under extreme pressure conditions and produces an indication of the film strength of the fluid being tested. The problem of reduction of friction between the drill string and the borehole requires a different simulation.
The more common lubricity test measures fluid resistance between two hardened steel moving surfaces at 100 pounds force (which translates into a 5,000 to 10,000 psi pressure on the intermediate fluid film). During the lubricity test, a steel block is pressed against a rotating steel ring. Load in inch-pounds is read directly from the dial on the torque arm.
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