Production Strategy and Selection of Artificial Lift Mode for Extra Heavy & High Viscous Crude Oil in an Indian Field
Author: Saurabh Rajvanshi and Avanish Chaubey
Abstract - Heavy oil is viscous in nature and generally has low API so it needs extra efforts for its production, extraction process and transportation. Conventional techniques are limited to breaking heavy components in crude oil. Its viscosity can be decreased through various methods such as thermal, solvent injection etc. Amongst the most applied methods for heavy oil extractions, thermal methods such as SAGD (steam assisted gravity drainage), THAI (toe-to-heel air injection process), In- situ combustion, chemical and microbial EOR processes have been indicated in literature. There are experimental techniques such as use of catalyst with down hole microwave and electromagnetic heating methods etc. Advanced and improved thermal techniques are a necessary for their recovery in an efficient manner. The Present paper studies the flow assurance problem of a typical extra heavy oil to be produced which can be categorized into two sections - flow of crude oil from reservoir to well bore and flow of crude oil from well bore to surface. Extensive literature review has been carried out to single out the most applicable EOR /stimulation techniques to facilitate the flow of crude from reservoir to wellbore. Suitable artificial lift scheme to mitigate vertical flow assurance problems faced in lifting the heavy crude.