November 2010

Optimization of plug utilized in lost circulation treatment while drilling

  The major problem of oil wells drilling is circulation lost that can occur near weak formations and before well cementing. Conventional methods such as lost circulation material pills, cement plugs and dual injection were used to combat different types of massive mud loss in spite of their small success rate and high cost and risk. A different circulation treatment has been introduced to optimize plugging of...

Author(s): Abdelkader Khiari, Djemoi Merzoug, Noureddine Gherraf, Mourad Kourichiand Noureddine Maza

November 2010

Nitrogen fixing capacity of legumes and their Rhizospheral microflora in diesel oil polluted soil in the tropics

  The nitrogen fixing capacity of legumes cowpea (Vigna unguiculata) and groundnut(Arachis hypogea) and their microflora grown in diesel oil simulated utisol was investigated. Result revealed that concentration as low as 1% v/w of diesel oil significantly affected the densities of nitrogen fixing bacteria, bacteriods, actinomycetes and fungi associated with the legumes. The heterotrophic...

Author(s): M. A. Ekpo and A. J. Nkanang