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Search Petrowiki: Behavior of bounded reservoirs
...Boundary effects in diagnostic plots PetroWiki (Redirected from Behavior of ...bounded reservoirs) Reservoir boundaries have significant influences on the shape of the diagnostic plot. The effects...he results can be bewildering. Well in an infinite-acting reservoir Infinite-acting, radial flow reservoirs are described on this page. Figs. 1 and 2 show their diagnostic curves. For these plots, the deriva...
Reservoir boundaries have significant influences on the shape of the diagnostic plot. The effects of boundaries appear following the middle-time region (infinite-acting radial flow) in a test. Recognizing the influence of boundaries can be as important as analyzing the test quantitatively. However, a problem in recognition is that many reservoir models may produce similar pressure responses. The model selected to interpret the test quantitatively must be consistent with geological and geophysical interpretations.
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...he results can be bewildering. Well in an infinite-acting reservoir Infinite-acting, radial flow reservoirs are described on this page. Figs. 1 and 2 show their diagnostic curves. For these plots, the deriva...om 0.5 to 1.0 on a plot of dimensionless variables). Similar responses occur in naturally fractured reservoirs with transient flow from the matrix to the fractures. * Fig. 4 โ Well near a single no-flow bound...
Reservoir boundaries have significant influences on the shape of the diagnostic plot. The effects of boundaries appear following the middle-time region (infinite-acting radial flow) in a test. Recognizing the influence of boundaries can be as important as analyzing the test quantitatively. However, a problem in recognition is that many reservoir models may produce similar pressure responses. The model selected to interpret the test quantitatively must be consistent with geological and geophysical interpretations.
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...Phase behavior of pure fluids An accurate characterization of phase ...behavior is critical to the prediction of oil recovery. Often, sufficient pressure-volume-temperature (PVT) ...numerical simulator. Contents * 1 Pressure-temperature diagrams * 1.1 PVT experiment * 2 Phase behavior models of pure fluids * 2.1 Ideal gas equation * 2.2 Real fluid equation * 2.3 Coefficient of is...
An accurate characterization of phase behavior is critical to the prediction of oil recovery. Often, sufficient pressure-volume-temperature (PVT) experimental data is not available, and mathematical models that are "tuned" to experimental data are needed.Equation of state (EOS) calculations are used for this purpose. EOS models are typically easy to implement in a numerical simulator. Calculation of vapor pressure * 2.4.5 Example calculation of two-phase envelope * 3 Nomenclature * 4 References * 5 Noteworthy papers in OnePetro * 6 External links * 7 See also The phase behavior of a typical pure fluid can be represented on a pressure-temperature diagram, as illustrated inFigure 1. From the Gibbs phase rule, the number of degrees of freedom are 3 -np, which means that one, two, or three phases can be present at equilibrium. For simplicity, these phases are shown as a solid, liquid, and a vapor, although numerous additional solid and liquid phases are possible, as long as no more than three of those phases coexist at equilibrium at the same temperature and pressure. Water, for example, has nine different solid phases, each of which has a different crystalline structure.[1] At the pressure and temperature of the Earth's surface, however, we experience only one solid, liquid, and vapor phase of water. The path indicated from point A, a vapor, to point B, a liquid, would never encounter an interface. According to the Gibbs phase rule, there are no degrees of freedom when three phases are in equilibrium. This necessarily implies that three phases must be in equilibrium only at one temperature and pressure; this is the triple point indicated inFigure 1.
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...PEH:Thermodynamics and Phase Behavior Publication Information Petroleum Engineering Handbook Larry W. Lake, Editor-in-Chief Volu...chi, Editor Copyright 2007, Society of Petroleum Engineers Chapter 7 โ Thermodynamics and Phase Behavior R.T. Johns, U. of Texas at Austin Pgs. 333-369 ISBN 978-1-55563-108-6 Get permission for reus...e Phase behavior describes the complex interaction between physically distinct, separable portions of matter called ...
Phase behavior describes the complex interaction between physically distinct, separable portions of matter called phases that are in contact with each other. Typical phases are solids, liquids, and vapors. Phase behavior plays a vital role in many petroleum applications, such as enhanced oil recovery, compositional simulation, geochemical behavior, wellbore stability, geothermal energy, environmental cleanup, multiphase flow in wellbores and pipes, and surface facilities. Thermodynamics, which is central to understanding phase behavior, is the study of energy and its transformations. Using thermodynamics, we can follow the energy changes that occur during phase changes and predict the outcome of a process. Thermodynamics began as the study of heat applied to steam power but was substantially broadened by Gibbs in the middle to late 1800s. Gibbs' most significant contribution was the development of phase-equilibrium thermodynamics applied to multicomponent mixtures, particularly the ...
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...PEH:Gas Reservoirs Publication Information Petroleum Engineering Handbook Larry W. Lake, Editor-in-Chief Volu...cs Edward D. Holstein, Editor Copyright 2007, Society of Petroleum Engineers Chapter 10 โ Gas Reservoirs Mark A. Miller, Consultant Edward D. Holstein, Consultant Pgs. 981-1036 ISBN 978-1-55563-120-8...ission for reuse This chapter addresses the flow characteristics and depletion strategies for gas reservoirs. The focus will be primarily on nonassociated accumulations, but much of the fluid ...
Natural petroleum gases contain varying amounts of different (primarily alkane) hydrocarbon compounds and one or more inorganic compounds, such as hydrogen sulfide, carbon dioxide, nitrogen (N2), and water. Characterizing, measuring, and correlating the physical properties of natural gases must take into account this variety of constituents. Phase Behavior of Natural-Gas Reservoirs A widely accepted system for categorizing petroleum reservoir fluids is based on five classes: low-shrinkage (crude) oils, high-shrinkage (volatile) oils, retrograde-condensate gases, wet gases, and dry gases. Typical phase diagrams for the gas categories are shown inFigs.
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...Waterdrive reservoirs PetroWiki (Redirected from Water drive ...reservoirs) Waterdrive (or water drive) petroleum ...reservoirs are characteristically ...
Waterdrive (or water drive) petroleum reservoirs are characteristically bounded by and in communication with aquifers. As pressure decreases during pressure depletion, the compressed waters within the aquifers expand and overflow into the petroleum reservoir. The invading water helps drive the oil to the producing wells, leading to improved oil recoveries. Like gas reinjection andgas cap expansion, water influx also acts to mitigate the pressure decline. The degree to which water influx improves oil recovery depends on the size of the adjoining aquifer, the degree of communication between the aquifer and petroleum reservoir, and ultimately the amount of water that encroaches into the reservoir.
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...Waterdrive reservoirs Waterdrive (or water drive) petroleum ...reservoirs are characteristically ...bounded by and in communication with aquifers. As pressure decreases during pressure depletion, the compres...
Waterdrive (or water drive) petroleum reservoirs are characteristically bounded by and in communication with aquifers. As pressure decreases during pressure depletion, the compressed waters within the aquifers expand and overflow into the petroleum reservoir. The invading water helps drive the oil to the producing wells, leading to improved oil recoveries. Like gas reinjection andgas cap expansion, water influx also acts to mitigate the pressure decline. The degree to which water influx improves oil recovery depends on the size of the adjoining aquifer, the degree of communication between the aquifer and petroleum reservoir, and ultimately the amount of water that encroaches into the reservoir.
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...PEH:Immiscible Gas Injection in Oil Reservoirs Publication Information Petroleum Engineering Handbook Larry W. Lake, Editor-in-Chief Volu...tor Copyright 2007, Society of Petroleum Engineers Chapter 12 โ Immiscible Gas Injection in Oil Reservoirs H.R. (Hal) Warner Jr., Warner Consulting Services and E.D. Holstein, Consultant Pgs. 1103-1147 ... ISBN 978-1-55563-120-8 Get permission for reuse This chapter concerns gas injection into oil reservoirs to increase oil recovery by immiscible displacement. The use of gas, either of a designed compositi...
The conceptual aspects of the displacement of oil by gas in reservoir rocks are discussed in this section. There are three aspects to this displacement: gas and oil viscosities, gas/oil capillary pressure (Pc) and relative permeability (kr) data, and the compositional interaction, or component mass transfer, between the oil and gas phases. The first two topics are discussed in this section; the third is discussed in the next section. Gas/Oil Viscosity and Density Contrast One must first understand the viscosity and density differences between gas and oil to appreciate why the gas/oil displacement process can be very inefficient. Gases at reservoir conditions have viscosities of 0.02 cp, whereas oil viscosities generally range from 0.5 cp to tens of centipoises.
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... ISBN 978-1-55563-120-8 Get permission for reuse This chapter discusses fluid flow in petroleum reservoirs. Basic concepts, which include flow equations for unsteady-state, pseudosteady-state, and steady-st...e curves, damage and stimulation, modifications for gases and multiphase flow, the diagnostic plot, bounded reservoirs, average pressure in the drainage area, hydraulically fractured wells, and naturally fractured ...reservoirs are included. The chapter also discusses transient and stabilized flow in horizontal wells and gas-...
Many important applications of fluid flow in permeable media involve 1D, radial flow. These applications are based on a model that includes many simplifying assumptions about the well and reservoir. These assumptions are introduced as needed to combine the law of conservation of mass, Darcy's law, and equations of state to achieve our objectives. Consider radial flow toward a well in a circular reservoir. Combining the law of conservation of mass and Darcy's law for the isothermal flow of fluids of small and constant compressibility yields the radial diffusivity equation,[1]
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...type of compositional numerical simulation of a miscible flood, it is crucial to identify the phase behavior occurring in the reservoir. Phase diagrams are a typical method for representing phase ...behavior. Contents * 1 Ternary and pseudoternary phase diagrams * 2 Vaporizing solvent drive process * ... diagrams and pseudoternary diagrams have been used for decades to visualize conceptually the phase behavior of injection-fluid/crude-oil systems. This is done by representing multicomponent fluids or mixture...
Before undertaking any type of compositional numerical simulation of a miscible flood, it is crucial to identify the phase behavior occurring in the reservoir. Phase diagrams are a typical method for representing phase behavior. Ternary diagrams and pseudoternary diagrams have been used for decades to visualize conceptually the phase behavior of injection-fluid/crude-oil systems. This is done by representing multicomponent fluids or mixtures by three pseudocomponents and then plotting fluid compositions in the interior of an equilateral triangle with apexes that represent 100% of each pseudocomponent and where the side opposite an apex represents 0% of that pseudocomponent. For example, the low-molecular-weight fraction might include methane and nitrogen and perhaps CO2 if CO2 is the primary injection solvent.
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