ASSESSMENT OF LOCAL CEMENTS FOR OIL WELL DRILLING IN THE NIGER DELTA
Journal Title: Academic Research International - Year 2018, Vol 9, Issue 3
Abstract
The abundant local cements frequently used for construction purposes in Nigeria, have been found to possess the following operational issues: low thickening time, low setting time and high gel strength. Oil well cementing is one of the most critical operations required to put the wellbore into production stage. In the Niger Delta region of Nigeria, high pressure and temperature exist beneath the earth and the cements must withstand these conditions in order to prevent costly damage, which threatens lives and onshore or offshore facilities. In this study, we carried out performance evaluation of local cements against industry standard class-G cement (Dykerhoff cement). The evaluation included three (3) scale experiments, according to API specifications, to measure the thickening time, rheology and compressive strength of the commonly found local cements (Dangote and Unicem cements) in the Niger Delta region. The slurries were formulated for the three samples using 456.61 g of the cements, 159.89 g of silica flour, 200.91 g of distilled water and other additives. In addition, we used Excel data analysis to correlate between the properties of cement pairs. The study shows that the local cements samples may possess the capability of being used for drilling in the Niger Delta region; but, require optimization of the oxide contents in order to meet drilling specifications. The selection of the appropriate cement composition and additives responsive to the conditions in the basin are the major issues with the utilization of local cement for oil well drilling. The Dangote cement performed better in terms of the compressive strength and thickening time, while the unicem performed better in terms of the rheology and ease of being pumped, thus, we recommend a hybrid cement mixture of the local cements in order to meet the HPHT condition found in the Niger Delta region of Nigeria.
Authors and Affiliations
Roland I. N. , Chinwah F. C. , Jibatswen T. Y. , Odineze C. M. , Bassah E. J. , Olowokere J. A.
Keywords
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