Inderscience Publishers

Experimental study of the effect of temperature on the flow behaviour of oil-based muds in Niger delta formation

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The behaviour of the drilling fluids under high temperature is extremely important for drilling deep wells. Most commercial oil-base drilling fluid systems have limitations such as reduced rheology and filtration control if the fluid is exposed to higher temperature for prolonged periods of time. Formulating a drilling fluid system that can adequately withstand drilling in a high temperature environment is very challenging but very often little attention is given to proper fluids design. In this research, two oil-based mud suitable for Nigerian formation were formulated and aged under high temperature conditions for 16 hours. The effect of aging on the properties of the proposed drilling fluid and the widely accepted fluid at high temperature was studied. From the study, it is observed that the proposed fluid was able to withstand high temperatures in a deep well than the widely accepted fluid. [Received: November 10; Accepted: March 23, 2011]

Keywords: yield point, drilling mud, plastic viscosity, gel strength, fluid loss, high temperature, rheology, filtration, emulsion, viscosifier, temperature, flow behaviour, coal technology, aging, drilling fluids, Nigeria, oil-based muds, Niger delta formation

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