Development of oil projects scheduling model and modification of project portfolio costs by balancing cost, time, quality and environmental impact objectives and solving it with metahistorical algorithms

Today, the use of new methods of project management and scheduling is an inevitable matter in oil projects. On the other hand, in classic scheduling case, the focus is on balance between time and cost of carrying out projects, which in such a situation, one of possible solutions to shorten time of implementing project is to accelerate activities. In addition to imposing more costs, this acceleration can also affect the quality of performance and environmental effects. Therefore, in this study, the environmental effects and the quality of the activities were also considered as new indicators the cost-time balancing issue of the project. A new mathematical model with four indicators; cost, time, performance quality and environmental effects are provided. Unlike the traditional models in which only one execution mode was considered to perform the activities and one type of prerequisite relationship between the activities, the execution modes of the activities are multi-mode and the dependency relationships between the activities are generalized from the type of prerequisite relationships and including these types of relationships, brings the issue closer to the real world. Because the problem is NP-hard in large dimensions, meta-heuristic algorithms were used to solve the model.