Laboratory Determination of the Effects of Microorganisms on the Rheological Properties of Niger Delta Clays
Journal Title: International Journal of engineering Research and Applications - Year 2017, Vol 7, Issue 9
Abstract
The inexorable role of drilling muds in the petroleum industry has prompted the necessity to evaluate cost effective and highly efficient locally sourced additives. It is known that clay mineralogical composition and mud additives amongst other factors can significantly influence mud performance during drilling operations. Hence, a thorough evaluation of these mud components and possible additives is essential. For this study, three clay samples from the Niger-Delta province; Lobia, Omoku and Ughelli were collected. This was done for the purpose of determining the effects of specific microorganisms particularly Shigella, Serretia and Pseudomonas Aeruginosa on some rheological properties of drilling mud prepared from these clay samples. A total of nine mud samples prepared with clay from each location were subjected to all three microbial cultures. Results from this study show that some mud properties such as apparent viscosity, pH, yield point, mud weight and plastic viscosity can be altered when subjected to these cultures. The acidity of the 6 mud samples prepared from the clays of Omoku and Lobia namely Omoku-1, Omoku-2, Omoku-3 and Lobia-1, Lobia-2, Lobia-3 increased after 144 hours. Mud weight for these samples also increased with time although a slight decrease from 9.90ppg to 9.85ppg was observed in Lodia-1. Samples from Ughelli behaved differently from others as they increased in alkalinity. Ughelli-3 (Pseudomonas Aeruginosa) which was initially slightly acidic with pH = 6.40 had a neutral indication of pH =7.00 after 144 hours. Graphical presentation of variations in other mud properties such as YP, PV and AV provide a better comprehension of the effect of these microorganisms on the drilling mud samples.
Authors and Affiliations
Nmegbu Chukwuma Godwin Jacob, Chimezie-Nwosu Harmony Agbonma
Keywords
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