Abstract
A significant percentage of hydrocarbon reservoirs around the world is fractured. Moreover, the major part of gas reservoirs in Iran is also fractured type, so the existence of an in-house software is necessary. In this study, an efficient, user-friendly, and indigenous simulation of a three-dimensional black oil fractured dry gas reservoir has been developed through IMPES method with the two-phase flow of gas and water. The presented simulator, which was written by C++ language and was known as fracture dry gas reservoir simulator, uses the implicit pressure and explicit saturation method for solving the equations. Also, effect of gravity pressure is neglected and effect of the capillary is considered in equations. By this simulator, we can investigate the dry gas reservoirs behavior with fractures. Darcy or non-Darcy fracture and matrix flow, Cartesian, cylindrical, and combination of Cartesian–cylindrical reservoir gridding, single porosity, dual porosity–single permeability, and dual porosity–dual permeability modeling are abilities of this simulator too. Additionally, this simulator is able to make outputs (such as pressure) at any given specific radius and time interval as numerical and/or graphical output in so little run time. Also, this simulator has PVT box and gridding box for doing the calculation of PVT and gridding. PVT box contains new correlations and EOS in comparison with another reservoir simulator. Gridding box makes us be able to simulate fractured dry gas reservoirs and hydraulically fractured well reservoirs too. Finally, the validity of this simulator was verified by comparing the simulation results with the other reservoir simulator (Eclipse) and showed a good compatibility between the developed software and Eclipse results in each time with different conditions such as various gridding conditions, various fluid data conditions and also various well configuration conditions.
Highlights
IntroductionWhen oil production has passed its peak, concludes that natural gas sources will be the essential source of energy for supporting world’s power in the decades
The consumption of natural gas has risen so fast (Al-Fattah and Startzman 1999).when oil production has passed its peak, concludes that natural gas sources will be the essential source of energy for supporting world’s power in the decades
In order to verify the ability of the developed code, two case studies from dual porosity–dual permeability fractured dry gas reservoirs have been chosen
Summary
When oil production has passed its peak, concludes that natural gas sources will be the essential source of energy for supporting world’s power in the decades In these conditions, a numerical simulation can be helpful in gas reservoir source estimation. The existence of a specific simulator to apply in the fractured dry gas reservoir can be helpful in properties calculation, resource and history estimation, better recognition of these reservoirs as a major energy source and so on. This simulator is developed in order to the accurate investigation of dry gas reservoir fluid flow with fractures by focusing on dry gas fluids parameters and fractures parameters too. Some works had been carried out on dry gas reservoir modeling and simulation, but no specific simulator had been developed that can be covered all problems of these reservoirs and expressed all parameters of dry gas fluid flow and fractures and led to a high accuracy
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