Each of these fluid types require different approaches when analyzing the reservoir, so it is important to identify the correct fluid type early on in the reservoir s life. In a gas condensate reservoir, the initial reservoir condition is in the singlephase area to the right of the critical point. Manningb aschool of oil and gas engineering and school of physics, university of western australia, crawley, western australia 6009, australia. In present paper, a selfdeveloped simulator applied in the optimized design of gas condensate reservoirs separators by determining optimized pressure, temperature, and number of separators in. Integrated reservoir modeling reservoir management integrated reservoir modeling reservoir models a reservoir model is a mathematical representation of a specific volume of rock incorporating all the characteristics of the reservoir under study. Pdf understanding gascondensate reservoirs navneet singh. At the time of discovery, gas condensates are often found as singlephase gas in the reservoir. Understanding gascondensate reservoirs semantic scholar. The development of gas condensate reservoirs by gas injection is treated in chapter 12. Calculation of hydrocarboninplace volume of a gas condensate reservoir from the geologic, reservoir, and production data requires a clear understanding of the behavior of oil and gas under various reservoir and surface operating conditions. Engineer your gascondensate systems, reservoir to sales meter. The phase diagram of a gas condensate system has a critical temperature less than the reservoir temperature and a cricondentherm greater than the reservoir temperature see figure 1. Appendix b includes some special physical and mathematical constants that are of particular interest in gas reservoir engineering. Gas traces a path where it enters the shaded retrograde condensation region within the twophase region rr.
Agreement between resulting blackoil and fully compositional simulations of gas condensate reservoir depletion is demonstrated for a very rich, nearcritical condensate. Fundamentals of gas reservoir engineering, volume 23 1st. Gas reservoirs lend themselves to easy calculation of the hydrocarboninplace through a general gas law equation. Compositional numerical model a case study of hai thach moc tinh fields. In this regime reservoir drive energy is provided only by the bulk expansion of the reservoir rock and liquids water and oil. Gas condensate production may be thought of as a type intermediate between oil and gas. A full spectrum of gas reservoir engineering techniques is addressed and their application to a large variety of gas resource management options is discussed. Upm 17050 sonarbased wellhead surveillance for gas. An earlier probabilistic assessment for the case study reservoir was built based primarily on core data from two analogous reservoirs, one of which was from the same field, prior to the availability of bottom hole pressure and drawdown data.
Flow measurement at the wellhead has proven to be challenging due to a number of factors. Pdf management of injected nitrogen into a gas condensate. Production optimization and reservoir management rely in part on periodic surveillance of produced oil, gas and water flow rates of individual gas condensate wells. Understanding gascondensate reservoirs request pdf. Gas reservoir management training course petroskills grm. Increasing well productivity in gas condensate wells in qatars north field. Gascondensate reservoir management october 2225, 1995. Once an accurate model was obtained, the following three solutions to.
Simulation of gas condensate reservoir performance onepetro. We examine implications for production and methods for managing the effects of condensate dropout, including reservoir modeling to predict field performance. A dry gas reservoir is defined as producing a single composition of gas that is constant in the reservoir, wellbore, and leaseseparation equipment throughout the life of a field. Flow behavior of gascondensate wells stanford university. It can be considered as a conceptual 3d construction of a single reservoir or in some.
To my gorgeous wife shanna, and my beautiful children jennifer justin brittany carsen reservoir eng fob 20011029 16. Pdf understanding gascondensate reservoirs navneet. This video is considered as an educational video used for nonprofitable purpose for all petroleum and nonpetroleum students in bue the british university in. Ding zhu condensate blockage negatively impacts large natural gas condensate reservoirs all over the world. The gas condensate reservoir is initially gas at the reservoir. The first step of the study involved gathering north field reservoir data from previously published papers. Henderson gd, danesh a, tehrani dh and alkharusi b. Gas condensate reservoirs represent unique and clean hydrocarbon source of energy, so prediction of their thermodynamic criteria especially dewpoint pressure pd is. Density, dielectric constant and pvt measurements of a gas. In gas condensate reservoirs, gas has relative abundance of heavier components, which condense out in the reservoir as the pressure declines.
Development of a gas condensate reservoir spe 10992, 11968. Engineer your gas condensate systems, reservoir to sales meter shah kabir chevron energy technology company spe 95531, 95528, 89753, 89754, 100384. Advanced gas condensate reservoir management whitson. Advanced course on reservoir management process by mobility oil and gas ltd. Management of injected nitrogen into a gas condensate reservoir. Ron terry discusses gas condensate reservoirs, calculating hydrocarbon in place using two methods.
Pdf understanding the behaviors of gas condensate reservoirs. Reservoir management goals for reservoir management primary goal maximizing the value of the asset reservoir net present value for the owner for the society secondary goals get sufficient information about the reservoir size and properties optimal recovery rate total recovery reducecontrol costs. Natural gas condensate aka gas condensate, condensate, natural gas liquids is a lowdensity, highapi gravity liquid hydrocarbon phase that generally. Pdf prediction of dew point pressure in gas condensate. The depletion of gas condensate reservoirs to pressures below the dew point has been studied by reservoir engineers for many years. The formation of liquid hydrocarbons in a gas reservoir as the pressure in the reservoir decreases below dewpoint pressure during production. In this chapter, gas reservoirs have been divided into three groups. The reservoir management consists on the application, within a given fiscal and contractual frame, of wellestablished industrial technologies and field best practices to a hydrocarbon reservoir, in order to efficiently perform the field operations and maximize the economic return of the investments.
Development of a gas condensate reservoir spe 10992. Developing an easytouse simulator to thermodynamic design. Production optimization in a marginal field through. A gas condensate with low condensate formation in the reservoir. The liquid is sometimes called by an older name distillate, and sometimes simply oil. Its presence as a liquid phase depends on temperature and pressure conditions in the reservoir allowing condensation of liquid from vapor.
Reservoir management core development of a gas condensate reservoir. Jan 30, 2016 chapter 5, part 1 of the online course in applied petroleum reservoir engineering. Moreover, gas condensate reservoirs like another re, servoirs, have this problem as well. Compositional numerical model a case study of hai thach moc tinh fields find, read. The study has shown that n 2 injection improves gas and ngl recovery with only a small. Tran and others published production performance of gas condensate reservoirs. Modelling the effect of composition change during condensate. Natural gas condensate aka gas condensate, condensate, natural gas liquids is a lowdensity, highapi gravity liquid hydrocarbon phase that generally occurs in association with natural gas. One personal computer is provided, at additional cost, for each two participants. Typically, there are five main types of reservoir fluids. Gascondensate reservoirs represent an important source of hydrocarbon reserves and have long been recognized as a reservoir type, possessing the most. The interdisciplinary reservoir management approach shows how each technology or function contributes to the plan and how checks and balances are developed. Pressure decline below the dew point pressure causes condensation to occur which creates a hydrocarbon liquid saturation in the reservoir.
How does a company optimize development of a gascondensate. Management of injected nitrogen into a gas condensate reservoir article pdf available in ingenieria e investigacion 361. This course will help participants understand the engineering drivers on gas reservoir management and how a gas reservoir s value can be maximized through sound engineering practices. Modeling and optimization of the rich gascondensate reservoir. In such instances as when the bottomhole pressure is reduced during production, the dewpoint pressure of the gas is reached in the nearwellbore region. Request pdf understanding gascondensate reservoirs the combination of. Gas condensate is a hydrocarbon liquid stream separated from natural gas and consists of highermolecularweight hydrocarbons that exist in the reservoir as constituents of natural gas but which are recovered as liquids in separators, field facilities, or gas processing plants. Efficient and costeffective reservoir management of gas condensate fields requires meeting the unique accurate well deliverability and. It is called retrograde because some of the gas condenses into a liquid under isothermal conditions instead of expanding or vaporizing when pressure is decreased. In cooperation with hot engineering, we are holding a 5day course on advanced gas condensate reservoir management, 1014 june 2019. Density, dielectric constant and pvt measurements of a gas condensate fluid eric f.
Majority of worldwide gas reservoir assets are constituted in gas condensate fields and have become a major trend of focus for the energy industry in recent times. Reservoir management assessments are also effective in providing a comparison with ideal or best practices that result in a more innovative environment and in establishing a method of documentation and measurement to determine how well reservoir management is being sustained despite changes in personnel and priorities. This procedure is applied with material balance requirements in generation of twocomponent, blackoil properties for gas condensates. For an undersaturated reservoir no free gas exists until the reservoir pressure falls below the bubblepoint. Gas production from gas condensate reservoirs using. Reservoir management training course petroskills rm. Reservoir management models for optimum field development and field operating plans are analyzed. Conventional gravitybased test separators cts and inline multiphase flow meters. However, calculation of hydrocarboninplace of a gas condensate reservoir is more complex because of the change from a single gaseous phase in the reservoir to two phases gas and condensate at the surface. Petroleum reservoirs an overview sciencedirect topics. A commercial simulator was then used to carry out numerical reservoir simulation of fluid flow in the north field. Pdf production performance of gas condensate reservoirs.
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