The various cycles which affect our oil industry have emphasised the need for detailed control of expenditure for development and production of small discoveries. However, should technical or economic conditions change, such fields may become commercial fields. Marginal fields have several parameters that affect them. This includes environmental concerns, political stability, access, remoteness and, of course, the price and price stability of the produced gas/liquids. This course will describe parts of unconventional methods to develop the marginal fields and mainly focus on innovative methods and new technology in developing those marginal fields.