The Effects of Temperature Variation on the Performance of Oil Well Cement Slurry Formulated With Rice Husk Ash and Eggshell Powder Ad-Mixtures Extender

Abstract

The primary cementing process is aimed at providing zonal separation, preventing loss of water, preventing casing rusting and holding the casing in place during drilling of oil and gas wells. The extender, a light weight additive, is one of the materials used to reduce the fluid column's hydrostatic pressure during cement placement. The performance of Conventional slurry extenders are usually reduced by high temperatures because they are made of polymeric materials which tend to thin out. The study's goal was to determine optimum performance of ESP and RHA additive as used as a cement slurry extender at varied temperatures. The rice husk ash was produced for 120 minutes at a temperature of 650 o C, whereas the egg shell powder was produced by drying and grinding. Their chemical compositions were determined using X-RF. The densities of CGC, RHA, and ESP were found to be 3.14, 2.41, and 2.69, respectively. The slurries were prepared by weighing 226 g of the total materials and making up to 600 ml according to the API standard. The experiments were carried out at temperatures of 30, 60, and 90 o C based on API specification. The fluid loss was determined at temperatures 30, 60, and 90 o C has its optimum performance as 527cc/30m, 0.00cc/30m and 284cc/30m respectively. The values 14.73 mL, 4.40 mL and 5.03mL were obtained for free water at 30. 60 and 90 o C respectively, while 780.3 psi, 999.9 psi and 308.91 psi were obtained as optimum for compressive strength determined at after 48 hours . The results indicated an optimum performance at temperature 60 o C. This making the materials fit for use at a reservoir having a geothermal temperature of 60 o C according to API, RP 10B-2010.