Petroleum Engineering
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Item Advancing sustainability of drilling fluid: coconut and shea butter oils as alternative to diesel(Sciencedomain International, 2024) Akintola, S.A.; Ehwarieme, F.; Amaechi, I.Drilling fluid is a key element in the drilling process because it lifts cuttings to the surface, maintains a stable wellbore, and generates sufficient hydrostatic pressure to prevent the influx of formation fluids into the wellbore. While oil-based drilling fluids offer advantages like wellbore stability, lubrication, and temperature resistance, disposing of oil-contaminated cuttings, particularly those using diesel, harms the environment. This study explores the use of coconut oil and shear butter oil, a renewable and biodegradable resource, as the base for oil-based drilling fluids. Two samples of coconut oil and shea butter oil-based mud samples were formulated and tested in the laboratory against the conventional crude oil-based mud. Laboratory tests compared each sample of coconut oil and shea butter oil-based mud against conventional diesel-based mud. Tests included FTIR characterization of additives, and evaluation of gel strengths, yield point, viscosity, and emulsion stability at 120°F and 300°F. Filtration loss and mud thickness were also measured. Results indicate that coconut oil and shea butter oil-based drilling fluids offer promising rheological properties and environmental benefits. Coconut oil-based sample (VCO I) exhibited superior viscosity and emulsion stability, though it produced a thicker mud cake, indicating a need for optimization. These alternatives present a viable solution to reduce the environmental impact of drilling operations. Further research and field trials are recommended for practical application.Item Effect of Guinea corn husk ash with the addition of basic oil well additives under downhole conditions on oil well cementing(Elsevier Inc., 2023) Akintola, S.A.; Akintola, A.O.Primary cementing is one of the most important aspects of completing an oil well. In Nigeria, most of the raw materials used are imported. There is therefore a need to source locally for feasible alternative raw materials which are available, cheap in conversion and environmentally friendly. The aim of this research is to investigate the effect of the partial replacement of Class G cement with Guinea Corn Husk Ash (GCHA) when cementing oil wells. Basic oil well additives are added during the process and the slurry is tested under downhole conditions. The compressive strength tests were carried out at Bottom Hole Circulating Temperature (BHCT) of 1400C using the Ultrasonic Cement Analyzer (Chandler- Model 4265). The fluid loss tests were carried out using the Filter Press (Chandler- Model 8340).The High Pressure High Temperature Consistometer (Chandler Model 8340) was used to obtain the thickening time of the various slurries and the rheological properties determined using the Rheometer. The result obtained from the various experiments conforms to the recommendations in the American Petroleum Institute recommended practice 10B –2/ISO 10426–2. The compressive strength values were more than 3.45 MPa. The Fluid Loss was below 5 x10-5m3. The Plastic Viscosities was in the range of 3.0 MPa.S – 10.0 MPa.S and the Yield Point was in the range of 10.0 lb/100ft2 – 30.0 lb/100ft2. The values of the thickening time were between 2.43 hrs and 11.53 hrs. More experiments should be carried out to determine the effect of GCHA on Class G cement Slurry as an extender when cementing oil wells.