Numerous circumstances, including the oil and gas industry's dynamic nature, compel businesses to sign contracts like engineering, procurement, and construction (EPC) contracts. Any delay or lack of skill in these contracts could be disastrous. In order to prevent straying from the project timeline or budget and to maximize business value, a perfect contract strategy is crucial. Contract strategy is, unsurprisingly, the top priority for oil and gas companies. As a result, the purpose of this study is to examine contracting tactics used in brownfield and gas projects. Numerous research that addressed the topic have been studied, and a number of strategic contracts have been identified and the advantages and disadvantages of each method have been clarified