Petroleum engineering is an engineering discipline concerned with the activities related to the production of hydrocarbons, which can be either crude oil or natural gas. Subsurface activities are deemed to fall within the upstream sector of the oil and gas industry, which are the activities of finding and producing hydrocarbons. This book presents current research in the study of sustainable petroleum engineering including topics such as optimisation techniques in groundwater monitoring network design for petroleum contaminant detection; a relation-analysis-based approach for assessing risks of petroleum-contaminated sites and an improved model for predicting formation damage induced by oilfield scales.