C 10 esters obtained from octanoic acid and acetic acid were evaluated for their suitability as base fluids in oil and gas wells drilling mud formulation. Comparison of the physicochemical parameters of the esters with that reported in literature revealed an agreement between the two sets of values. Two mud formulations were designed from each of the esters and their rheology profile between 80 o F and 200 o F compared with that of a commercially available synthetic base fluid. The result of the rheological tests performed on all the drilling muds formulated indicated that with appropriate additives, the mud formulation using the two synthetic esters could perform as good as the reference fluid.
The catalytic properties of potassium hydrogen sulphate, molecular iodine and sulphamic acid towards the synthesis of esters of propanol and isopropanol with lauric acid were carried out at 100and 120 O C. The most efficient catalyst at both temperatures was found to be sulphamic acid, closely followed by molecular iodine and then potassium hydrogen sulphate. Benchmarking of the products with commercially available synthetic base fluid indicated that the esters have suitable physicochemical properties for synthetic base fluid application. The results obtained from comparing the rheology of muds prepared with ester products and that with the commercially available synthetic base fluid indicate that the muds prepared with propyl and isopropyl laurate have higher electrical stability than the mud prepared with the reference base fluid. The results obtained also showed that the mud prepared with the esters synthesised in this work displayed comparable properties and performance with the mud prepared with the reference synthetic base fluid. However, isopropyl laurate (IL) formulated mud had better temperature stability than propyl laurate (PL).
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