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Search Petrowiki: NP
...ike to know is, therefore, 2 ncnp , wherenp is the number of phases (for vapor/liquid equilibrium, np is two). These intensive properties can only be determined if a sufficient number of equations are ...at there arenp summation equations (i.e., the phase mole fractions for each phase sum to 1.0) andnc(np - 1) equilibrium relations, for a total ofnp nc(...np - 1) equations. The equilibrium relations could be given asK-values , which relate the component li...
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. 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.
- Information Technology > Knowledge Management (0.41)
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...ike to know is, therefore, 2 ncnp , wherenp is the number of phases (for vapor/liquid equilibrium, np is two). These intensive properties can only be determined if a sufficient number of equations are ...at there arenp summation equations (i.e., the phase mole fractions for each phase sum to 1.0) andnc(np - 1) equilibrium relations, for a total ofnp nc(...np - 1) equations. The equilibrium relations could be given asK-values , which relate the component li...
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. 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.
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...er injected should be greater than 25% of the hydrocarbon pore volume. RF vs. HCPVI, Log (WOR) vs. Np, Log (Qo Qw) vs. ...Np and Masoner plots should be also used in waterflood cases in addition to conventional methods menti...tional plots to ensure there is no overestimation of volumes based on rate plots only. (Log WOR vs. Np, Log GOR vs. ...
Decline curve analysis (DCA) is a graphical procedure used for analyzing declining production rates and forecasting future performance of oil and gas wells. Oil and gas production rates decline as a function of time; loss of reservoir pressure, or changing relative volumes of the produced fluids, are usually the cause. Fitting a line through the performance history and assuming this same trend will continue in future forms the basis of DCA concept. It is important to note here that in absence of stabilized production trends the technique cannot be expected to give reliable results. Three constants * 4.3.5 Decline rate is not a constant * 4.3.6
- Information Technology > Modeling & Simulation (1.00)
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...itial oil saturation, fraction * Sf oil saturation burned, fraction * Vb volume burned, m3 * Np oil produced, m3 * Wp water produced, m3 * Ф porosity, fraction * Vp volume of the patte...these correlations are expected to be reasonably accurate for line-drive projects. Nomenclature Np oil produced, m3 Sf oil saturation burned, fraction So oil saturation, fraction S...
Predicting the production response to in-situ combustion (ISC) has been the topic of various studies. Completenumerical simulation of in-situ combustion is difficult because of the complex reactions and the thin burning front that requires small gridblocks for representation. The easiest method is essentially a tank balance,[1] adapted by Prats.[2] The oil and water produced are given by If the volumes are in acre-ft and the production terms are in bbl, a multiplication factor of 7,758 must be used. The estimate of 40% of the oil produced coming from outside the burned volume is an empirical value based on experience. This is the 0.4 term inEq. 1. Figure 1, presented by Gates and Ramey,[3] combines laboratory results and field observations from the Belridge in-situ combustion projects. It shows the effect of initial gas saturation on the oil recovery history.
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...-control equipment.[1] References * "Definition of Well Control - IADC Lexicon." IADC Lexicon. N.p., 23 Apr. 2013...
Using barriers to prevent unwanted flow of hydrocarbons to surface. Collective expression for all measures that can be applied to prevent uncontrolled release of wellbore fluids to the external environment or uncontrolled underground flow. Well-control means methods used to minimize the potential for the well to flow or kick and to maintain control of the well in the event of flow or a kick. Well-control applies to drilling, well-completion, well-workover, abandonment, and well-servicing operations. It includes measures, practices, procedures and equipment, such as fluid flow monitoring, to ensure safe and environmentally protective drilling, completion, abandonment, and workover operations as well as the installation, repair, maintenance, and operation of surface and subsea well-control equipment.[1]
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...ing GOR, Rps, histories; (b) gas-saturation history; (c) oil-rate,qso, gas-rate, qsg, oil recovery, Np/N, and gas-recovery,Gp/G, histories. Stage 2 also is relatively brief, lasting only several months...q. 10 yields Table 6 tabulates the results at other pressures and the cumulative GOR, Rps G ps/Np. * Table 6 Fig. 4 shows a plot of F vs. Eo. The slope of this plot is 10.2 million STB, which is...3, scf N total original oil in place, L3, STB Nfoi initial free oil in place, L3, STB Np cumulative produced oil, L3, STB Rs dissolved GOR, scf/STB Rsw dissolved-gas/water ...
Oil reservoirs that do not initially contain free gas but develop free gas on pressure depletion are classified as solution gas drives. The solution gas drive mechanism applies once the pressure falls below thebubblepoint. Both black- and volatile-oil reservoirs are amenable to solution gas drive. Other producing mechanisms may, and often do, augment the solution gas drive. Solution gas drive reservoir performance is used as a benchmark to compare other producing mechanisms.
- North America > United States > Texas > Permian Basin > Yeso Formation (0.99)
- North America > United States > Texas > Permian Basin > Yates Formation (0.99)
- North America > United States > Texas > Permian Basin > Wolfcamp Formation (0.99)
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- Reservoir Description and Dynamics > Reservoir Characterization (1.00)
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- Reservoir Description and Dynamics > Fluid Characterization > Phase behavior and PVT measurements (1.00)
- Reservoir Description and Dynamics > Formation Evaluation & Management > Drillstem/well testing (0.92)
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...cified. The number of intensive properties that we would like to know is, therefore, 2 ncnp, where np is the number of phases (for vapor/liquid equilibrium,...np is two). These intensive properties can only be determined if a sufficient number of equations are ...at there arenp summation equations (i.e., the phase mole fractions for each phase sum to 1.0) andnc(np - 1) equilibrium relations, for a total of ...
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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...n it (in other words, the number of atoms per cm3). Suppose the slab in the figure has an average ofNp atoms/cm3. If the slab is h cm thick, a beam of unit area will encounter and have a chance to inter...N a counting number NA Avogadro's number 6.02 10 23 molecules/gram molecular weight Np particle number density Px Poisson probability distribution Sw water saturation V...
Nuclear logging has been used in some form since the late 1920s to provide information on lithology and rock characteristics. Continued technological advances have provided improved methods for analyzing the measurements of natural and induced nuclear readings. Even with better tool designs, the long-standing problem remains that logging tools do not directly measure the formation properties that engineers, geologists, and petrophysicists need to describe a reservoir. The goal of log analysis is to map out the downhole values of reservoir characteristics chiefly as porosity, fluid saturations, and permeability. Unfortunately, nuclear-logging tools only measure gamma ray or neutron count rates at cleverly positioned detectors. Inference, empiricism, experience, and alibis bridge these count rates to the rocks and fluids in the reservoir.Nuclear-log interpretation rests on smarter processing of these tool readings.
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...ay count rate 1/t Ni ni oil in place in reservoir, initial L3 NN Nn,CN neutron count rate 1/t Np np oil produced, cumulative L3 Npa npa oil recovery, ultimate L3 NR NF fuel deposition rate m/L3t ...ction, fluid, linear aquifer, dimensionless Qp QℓtD (script l) fluids, cumulative produced (where Np and Wp are not applicable) Qp produced fluids, cumulative (where ...Np and Wp are not applicable) L3 QtD fluid influx function, dimensionless, a dimensionless time tD ...
CC1 cC1 concentration, methane (concentration of other paraffin hydrocarbons would be indicated similarly,CC2, C C3, etc.) various CO2 cO2 concentration, oxygen (concentration of other elements or compounds would be indicated similarly,CCO2, CN2, etc.) Lf xf fracture half-length (specify "in the direction of" when using xf) L Mt Fλt mobility ratio, total, [(λt)swept/(λt)unswept]; "swept" and "unswept" refer to invaded and uninvaded regions behind and ahead of leading edge of displacement front
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... where: * Gfgi, Nfoi, and W are the initial free gas, oil, and water in place, respectively * Gp, Np, and Wp are the cumulative produced gas, oil, and water, respectively * GI and WI are the cumulati...lace, L3, STB Nfoi initial free oil in place, L3, STB Ng dimensionless gravity number Np cumulative produced oil, L3, STB p pressure, m/Lt2, psi pe pressure at drainage rad...
The material-balance equation is the simplest expression of the conservation of mass in a reservoir. The equation mathematically defines the different producing mechanisms and effectively relates the reservoir fluid and rock expansion to the subsequent fluid withdrawal. The applicable equation for initially saturated volatile- and black-oil reservoirs is[1][2][3][4] Most of the equations regarding primary drive mechanisms for oil reservoirs apply to any consistent set of units. A few equations, however, are written assuming English or customary units. Nfoi and Gfgi are related to the total original oil in place (OOIP) and original gas in place (OGIP),N and G, according to N Nfoi Gfgi Rvi and G Gfgi N foi Rsi.
- North America > United States > Texas > Permian Basin > Yeso Formation (0.99)
- North America > United States > Texas > Permian Basin > Yates Formation (0.99)
- North America > United States > Texas > Permian Basin > Wolfcamp Formation (0.99)
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