Chemistry and Chemicals are integral part of upstream as well as downstream Oil & Gas Industry. They play a significant role in drilling, well completion, well stimulation, water shut off, flow assurance, crude oil demulsification, corrosion inhibition, effluent treatment, microbiological controls, injection water treatment, enhanced oil recovery etc in upstream oil and gas drilling and production. In downstream processes, they play role in catalysis, lubricants and greases, additives, absorption and adsorption, cleaning systems, cracking and fuel technology, heat exchange systems, sludge handling, H2S scavenging, pipeline transportation, solvents, polymers, corrosion inhibition, effluent treatment, microbiological issues etc. Chemicals are used as an oxygen scavenger, corrosion inhibitor, biocide, demulsifier, surfactants in several operations, solvents, paraffin inhibitor and dispersant, pout point depressant, drag reducer, polyelectrolyte, defoamer, deoiler etc. A broad range of chemicals has been developed by researchers and service providers to meet the challenges and provide new avenues. Chemistry of crude oil and water plays an important role in most of these applications of chemicals and hence their detailed analysis and characterization will also form a part of the discussion of this conference.