Reservoir Engineering Studies:

Management of oil and gas reservoirs includes all the activates of exploration, drilling, production, processing & separation of oil & gas and finally refining or exporting. 
In planning for improved recovery the following questions arise: 
1 - How much is the amount of gas & oil-in-place in a reservoir ? 
2 - What are the physical & chemical properties of the fluids in a reservoir ? 
3 - How is the geological structure and stratigraphic layering and different types of reservoir rock ? 
4 - How much of gas or oil could be produced ? 
5 - What are the reservoir mechanisms, and production methods ? 
6 - How many wells would be required ? 
7 - At what location the new wells are to be drilled ? 
8 - When do we expect the wells to yield excess gas or water production ? 
9 - How to reduce the excess gas or water production in the wells ? 
10- What would be the optimum condition for design of separation facilities ? 
11- Is the reservoir energy sufficient for production ? 
12- How can we improve the reservoir energy (i.e. : gas injection, water injection, etc)? 
13- When , where and how much to inject the fluids if required ? 
14 - What are the main economic parameters in bringing the reservoir to production? 
For answering the above question the comprehensive reservoir studies including the major following activates are performed. 
  
1- Geophysical/Geological Studies 
Containing  : Review of depth maps, correction of formations tops, conversion of geographic system, correction of drill depths, preparation of base maps and structural and stratigraphic maps, preparation of ISO-maps (porosity, water saturation,…) 

2 - Petrochemical Evaluation 
Containing : digitization of logs, calibration of logs, reevaluation of logs, determination of cut-off limits, calculation of average porosity and water saturation, determination of initial water-oil contact 
3 - Reservoir Engineering Studies (Fluids & Rock Properties) 
Containing : Evaluation of temperature variation effects, PVT test evaluation and interpretation, evaluation of fluid properties with respect to pressure or temperature variations, permeability and capillary pressure plots, determination of end points of permeability curves, water saturation versus depth plots and ISO-Permeability plots. 
4 - Reservoir Engineering Studies (Evaluation of Production History & well tests) 
Containing : Calculation of oil -in-place, preparation of pressure versus time plots, evaluation of communication between reservoir layers, production history evaluation, well test analysis and interpretation, preparation of ISO-bar maps. 
5 - Reservoir Simulation 
Containing : preparation of 3-dimensional reservoir model , initialization of model , evaluation & adjustment of model parameters, comparison of oil-in-place, reservoir history matching, wells history matching , natural depletion prediction, water injection and gas injection evaluation, evaluation of effect of horizontal wells, sensitivity analysis for different parameters. 
6 - Economic Evaluation of Development Plans 
Containing : definition of different field development plans. Cost estimate for each plan, definition of production/injection scheme for each plan, comparative economic evaluation of each plan with the base case, selection of  the best development plan.