As the global HC exploitation paradigm shifts to the unconventional (low-quality) reservoirs; the deep uncertainty in their production processes involved makes the operators, following the Specific Discipline Approach, vulnerable to adopt the trial-and- error methods which can detriment the whole development plan and assimilate irreparable loss upon the foul decisions. Since each engineering discipline may have a piece of puzzle to find the best solution for achieving optimized production rates and economics, we can only hope to achieve the better results if we use a total system (reservoir to sales approach).

Pakistan is facing the severe energy crisis, due to which the effective and sensible exploitation of the tight gas reserves has become inevitable. Integrated Asset Modelling (IAM) constructs a thorough way out by increasing communication and literally gets all disciplines "on the same page" by using a common model.

The paper is based on designing a full field development plan of a tight gas reservoir (TGRs). It involves developing an integrated reservoir model and evaluating its performance for various reservoir and production scenarios, along with the economic analysis, to come up with an optimum gas field development plan. The methodology is carried out with two approaches (i) Integrated Tank Model (ii) Numerical 3D Model.

The paper presents the usefulness of IAM and its systematic approach in production maintenance and optimization, crossfunctional collaboration and in effective field management of tight gas reservoirs. It will present detailed discussion on the economics, process cycle, modelling, optimization, game-changers and exploitation of TGRs along with case studies and intends to give valuable insight to the implementation of this integrated technique to the prevalent energy crisis of the country.

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