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Home  >  Volume 32 (Nov. 2015)

Determination and Comparative Study of the Effects of Temperature on the Rheological Properties of Oil Base Drilling Fluid by Oloro John (pages397-410)
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This work is to determine and compare the effects of temperature on rheological properties of oil base drilling fluid and this was carried out by  formulating  Oil Base Mud samples using two indigenous clay materials situated in Delta state and Edo state respectively.

Samples were produced using three varied concentrations of Oil to Water ratio. These include 80:20, 50:50 and 20:80 of Oil to Water. Each sample is tested and readings for the Mud weight, Electrical Stability, Viscosity, Gel Strength, and others were analyzed with respect to their various behaviors as temperature was varied.

From the three ratios used, the better one was the 80:20 formulation and the others which are 50:50 and 20:80, did not yield reasonable results. Meanwhile in the industry, the accepted or majorly used ratios include the 80:20. The other two were just additions to confirm the behavior of the prepared samples.

The results obtained from the 80:20 formulation shows that all the properties tested for increased as the temperature decreased, with the exception of Electrical Stability.

To further confirm this observation, various plots were made from the readings obtained. Which further confirmed that as temperature decreased, all tested properties increased with an Exception of Electrical Stability.

T-test was carried out to compare the prepared foreign betonies mud sample against Emede and Mamu samples individually to check which of these indigenous is a good match to Bentonite.

Mamu sample was accepted to be a better match to Bentonite against Emede sample for the preparation of Oil Base Drilling Mud.

 Keywords: Temperature, Rheological, Mud, Bentonite, Properties