Author: Partha Ghosh, D.S. Rawat and C.P. Verma

Abstract - The Anklav field of Cambay Asset is encountering flow related problems due to the highly viscous nature of the produced crude oils. To mitigate this problem, three crude oil samples of wells Anklav-A, Anklav-B and Anklav-C of the Cambay Asset were selected for the studies to identify a suitable chemical treatment for the individual wells. The oils are of medium gravity with relatively high 0 0pour point (39C-42C). High asphaltene content (7.31% to 12.24%) may be the factor responsible for the viscous nature of the crude oils. Twenty chemical formulations prepared in the lab (chemical additives procured from different vendors) were evaluated to identify the most suitable chemical formulation to enhance the flow. The chemical formulations effectively act as flow behaviour improvers, pour point depressants, inhibitors of the wax precipitation process and are even capable to remove & disperse wax already deposited in the production tubing and surface pipelines.

The three identified chemicals, Aquat ER 482, EC 5353A, and IGPPD 12048SK, reduced the viscosity of treated crude oil up to 93% to 96% and depressed 0 0t he pour point to 27 C - 30 C. The chemicals could exhibit paraffin inhibition efficiency in the range of 58% to 72% and wax dispersion effect from 48% to 61%. 

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