...Jeffrey A. Joseph; Leonard F. Koederitz This paper presents short-time interpretation methods for radial-spherical (or radial-hemispherical) flow in homogeneous and isotropic reservoirs inclusive of wellbore storage, wellbore phase redistribution, and damage skin effects. New dimensionless groups...

...Roland N. Horne A method for determining pressure transient solutions for wells with storage (and skin) is presented; this method is based on an approach developed by Fenske 1 in the groundwater literature. By specifically conserving the entire mass of the system, including the wellbore...

...-zone model drillstem/well testing type curve wellbore storage assumption tight-zone vertical permeability reservoir pressure response vertical interference test drillstem testing test data permeability rate pulse analytical model interference vertical permeability tight zone...

... concentration. Samples prepared with this technology have not lost viscosity after 1-year storage at 207 °F [97 °C]. A high-surface-area effect (so-called "wall effect"), known to retard radical propagation, was also found to operate in the presence of sandpacks; this should be beneficial in porous media...

... of Petroleum Engineers root model fractured reservoir pressure response gradient model pressure segment pressure distribution matrix block artificial intelligence storage drillstem testing pressure curve drawdown assumption warren upstream oil & gas pressure change pressure behavior...

...Hubert Winston The nature of wellbore storage is such that afterflow during a pulse test can affect the reservoir pressure performance and can lead to the calculation of erroneous values for formation transmissibility and storage. This is most likely to occur when the wells of interest are close...

...Constance W. Miller; Sally M. Benson; Michael J. O'Sullivan; Karsten Pruess A method of designing and analyzing pressure transient well tests of two-phase (steam/water) reservoirs is given. Wellbore storage is taken into account, and the duration of it is estimated. It is shown that the wellbore...

... must be defined to describe the set of curves that could take place for each value of the wellbore storage coefficient C D . In addition, the effect of temperature changes along the bore is shown to increase the time when wellbore storage is important. 2 7 1979 14 9 1980 4 4 1980 1...

...-sensitive parameters of skin and storage are present at the parameters of skin and storage are present at the wellbores of the test wells. Generally, the reciprocity principle is not valid for wells with skin and storage principle is not valid for wells with skin and storage factors. However, for special...

.... Available techniques include both direct solution and iterative methods such as ADIP, SOR, and SIP. Iterative methods are currently used almost to the exclusion of direct solution because of the significantly higher computer storage and time requirements of the latter. This paper describes some new ordering...

... mobility pressure error reservoir parameter Observation Point influence coefficient Modeling & Simulation constraint constraint interval procedure storage nobility equation Performance Matching With Constraints ABSTRACT R. D. CARTER MEMBER SPE-AIME L. F. KEMP, JR. A. C. PIERCE D. L...

... a considerable sailings in core storage. It is no longer necessary to store grid-block temperatures for cap and base rock nor to solve the finite-difference form of the energy balance in this region. Instead a system of two nonlinear ordinary differential equations must be solved for each grid block...

... storage and various skin effects such as those due to perforations, partial penetration, non-Darcy flow, or well stimulation effects. Recently, Agarwal et al. presented a fundamental study of the importance of wellbore storage with a skin effect to short-time transient flow. This paper further extends...

... of a set of simultaneous linear equations whose coefficient matrix for this application is very sparse. In preparing digital computer programs using this model, this sparsity has been exploited to great advantage in core storage savings and execution time efficiency. The basic aspects of a sparse matrix...

... as pressureinformation obtained prior to the usual straight-lineportion of a well test. For some time there has been portion of a well test. For some time there has been a general belief that the factors affecting short-timedata are too complex for meaningful interpretations. Among these factors are wellbore storage...

...Robert A. Wattenbarger; H.J. Ramey, Jr. An investigation of the effect of wellbore storage and skin effect on transient flow was conducted using a finite-difference solution to the basic partial differential equation. The concept of skin partial differential equation. The concept of skin effect...

... of the zones, and that apparent storage (phi ch) is always equal to or less than the total storage of the zones. These apparent zone properties approach total properties as vertical fluid communication between zones increases. The presence of non uniform wellbore damage in the zones alters the division of flow...

...Saul Vela; R.M. McKinley Reservoir transmissibility and storage values can be obtained from pressure pulses induced in one well and measured at a second well. Such pulse-test values are generally calculated from pulse-test values are generally calculated from equations which assume the formation...

... step coefficient storage Upstream Oil & Gas calculation SOR elimination reservoir simulation dimension convergence Gauss elimination Fluid Dynamics matrix finite difference grid equation differential equation simulation equation iteration point sor grid Solution...

...K.H. Coats; J.G. Richardson During the initial growth of a gas bubble in an aquifer storage reservoir the injected gas tends to override the water. The resulting low displacement efficiency and big rate of gas travel down-structure make it difficult to maintain water-free production. This paper...