Abstract
Due to the difficulty that the compressive strength of cement slurries formulated with bentonite are not stable at elevated temperature conditions, in addition to other properties at high temperatures, Mucuna solannie commonly known as “Ukpo” was examined as an alternative. API standard procedures were employed throughout the laboratory measurements to determine overall rheological properties, compressive strength, thickening time, and free water of the extenders both at 150 °F (65.6 °C) and 200 °F (93.3 °C) BHCT. Mucuna solannie results gave compressive strength at 24 h as 952 psi (6.56E+6 Pa) and 900 psi (6.21E+6 Pa), free water values of 0 and 0.2 ml, yield point values of 67 lb/100ft2 (32.08 Pa) and 66 lb/100ft2 (31.60 Pa), and 10 min gel strength of 16 lb/100ft2 (7.66 Pa) and 22 lb/100ft2 (10.53 Pa). Bentonite additive gave 24 h compressive strength as 620 psi (4.27E+6 Pa) and 565 psi (3.9E+6 Pa), free water of 4.4 and 4.8 ml, yield point of 56 lb/100ft2 (26.81 Pa) and 46 lb/100ft2 (22.02 Pa), and 10 min gel strength of 16 lb/100ft2 (7.66 Pa) This showed that Mucuna solannie is a better alternative cement extender than Bentonite, especially where optimum free water and compressive strength are needed. Although it is found to be lacking in efficient plastic viscosity and thickening time, it can be resolved by the use of additives such as dispersant and accelerator to complement its properties.
Experimental analysis of Mucuna solannie as cement extender additive for oil and gas well cementing