Estimating Non-Darcy Flow Coefficient from Buildup Test Data With Wellbore Storage

2002 ◽  
Author(s):  
J.P. Spivey ◽  
K.G. Brown ◽  
W.K. Sawyer ◽  
J.H. Frantz
Keyword(s):  
Test Data ◽  
Flow Coefficient ◽  
Darcy Flow ◽  
Wellbore Storage

Estimating Non-Darcy Flow Coefficient From Buildup-Test Data With Wellbore Storage

2004 ◽  
Vol 7 (04) ◽  
pp. 256-269 ◽  
Author(s):  
J.P. Spivey ◽  
K.G. Brown ◽  
W.K. Sawyer ◽  
J.H. Frantz
Keyword(s):  
Test Data ◽  
Flow Coefficient ◽  
Darcy Flow ◽  
Wellbore Storage

scholarly journals Introduction of an Universal Scale-Up Method for the Efficiency of Axial and Centrifugal Fans

2014 ◽  
Author(s):  
Peter F. Pelz ◽  
Stefan S. Stonjek
Keyword(s):  
Test Data ◽  
Scale Up ◽  
Pressure Rise ◽  
Flow Coefficient ◽  
Total Efficiency ◽  
Scaling Method ◽  
Centrifugal Fans ◽  
Axial Fans ◽  
Definition Of ◽  
Acceptance Tests

Acceptance tests on large fans to prove the performance (efficiency and total pressure rise) to the customer are expensive and sometimes even impossible to perform. Hence there is a need for the manufacturer to reliably predict the performance of fans from measurements on down-scaled test fans. The commonly used scale-up formulas give satisfactorily results only near the design point, where inertia losses are small in comparison to frictional losses. At part- and overload the inertia losses are dominant and the scale-up formulas used so far fail. In 2013 Pelz and Stonjek introduced a new scaling method which fullfills the demands ( [1], [2]). This method considers the influence of surface roughness and geometric variations on the performance. It consists basically of two steps: Initially, the efficiency is scaled. Efficiency scaling is derived analytically from the definition of the total efficiency. With the total derivative it can be shown that the change of friction coefficient is inversely proportional to the change of efficiency of a fan. The second step is shifting the performance characteristic to a higher value of flow coefficient. It is the task of this work to improve the scaling method which was previously introduced by Pelz and Stonjek by treating the rotor/impeller and volute/stator separately. The validation of the improved scale-up method is performed with test data from two axial fans with a diameter of 1000 mm/250mm and three centrifugal fans with 2240mm/896mm/224mm diameter. The predicted performance characteristics show a good agreement to test data.

scholarly journals Explicit Deconvolution of Well Test Data Dominated by Wellbore Storage

2014 ◽  
Vol 2014 ◽  
pp. 1-12
Author(s):  
K. Razminia ◽  
A. Hashemi ◽  
A. Razminia ◽  
D. Baleanu
Keyword(s):  
Test Data ◽  
Material Balance ◽  
Early Time ◽  
Time Behavior ◽  
Well Test ◽  
Deconvolution Method ◽  
Pressure Data ◽  
Practical Applications ◽  
Wellbore Storage ◽  
Storage Effects

This paper addresses some methods for interpretation of oil and gas well test data distorted by wellbore storage effects. Using these techniques, we can deconvolve pressure and rate data from drawdown and buildup tests dominated by wellbore storage. Some of these methods have the advantage of deconvolving the pressure data without rate measurement. The two important methods that are applied in this study are an explicit deconvolution method and a modification of material balance deconvolution method. In cases with no rate measurements, we use a blind deconvolution method to restore the pressure response free of wellbore storage effects. Our techniques detect the afterflow/unloading rate function with explicit deconvolution of the observed pressure data. The presented techniques can unveil the early time behavior of a reservoir system masked by wellbore storage effects and thus provide powerful tools to improve pressure transient test interpretation. Each method has been validated using both synthetic data and field cases and each method should be considered valid for practical applications.

Semi-analytical solution to pumping test data with barrier, wellbore storage, and partial penetration effects

2017 ◽  
Vol 226 ◽  
pp. 44-51 ◽  
Author(s):  
Yong-Xia Wu ◽  
Jack Shuilong Shen ◽  
Wen-Chieh Cheng ◽  
Takenori Hino
Keyword(s):  
Analytical Solution ◽  
Test Data ◽  
Pumping Test ◽  
Partial Penetration ◽  
Wellbore Storage

Analysis of Interference Test Data Influenced by Wellbore Storage and Skin at the Flowing Well

1980 ◽  
Vol 32 (01) ◽  
pp. 171-178 ◽  
Author(s):  
Wei Chun Chu ◽  
J. Garcia-Rivera ◽  
Raghavan Rajagopoal
Keyword(s):  
Test Data ◽  
Wellbore Storage ◽  
Interference Test ◽  
Flowing Well

scholarly journals Modeling Multiphase Effects in CO2 Compressors at Subcritical Inlet Conditions

2019 ◽  
Vol 141 (8) ◽  
Author(s):  
Ashvin Hosangadi ◽  
Zisen Liu ◽  
Timothy Weathers ◽  
Vineet Ahuja ◽  
Judy Busby
Keyword(s):  
Test Data ◽  
Elevated Temperatures ◽  
Wilson Line ◽  
Saturation Pressure ◽  
Flow Coefficient ◽  
Pure Liquid ◽  
Two Phase ◽  
Pressure Profiles ◽  
Wide Range ◽  
Inlet Conditions

An advanced numerical framework to model CO2 compressors over a wide range of subcritical conditions is presented in this paper. Thermodynamic and transport properties are obtained through a table look-up procedure with specialized features for subcritical conditions. Phase change is triggered by the difference between the local values of pressure and saturation pressure, and both vaporization and condensation can be modeled. Rigorous validation of the framework is presented for condensation in high pressure CO2 using test data in a De Laval nozzle. The comparisons between computations and test data include: condensation onset locations, Wilson line, and nozzle pressure profiles as a function of inlet pressures. The framework is applied to the Sandia compressor that has been modeled over broad range of conditions spanning the saturation dome including: near critical inlet conditions (305.4 K, and 7.843 MPa), pure liquid inlet conditions (at 295 K), pure vapor inlet conditions (at 302 K), and two-phase inlet conditions (at 290 K). Multiphase effects ranging from cavitation at the liquid line to condensation at the vapor line have been simulated. The role of real fluid effects in enhancing multiphase effects at elevated temperatures closer to the critical point has been identified. The performance of the compressor has been compared with test data; the computational fluid dynamics (CFD) results also show that the head-flow coefficient curve collapses with relatively minor scatter, similar to the test data, when the flow coefficient is defined on the impeller exit meridional velocity.

scholarly journals Centrifugal compressor impeller loading factor analysis

2019 ◽  
Vol 124 ◽  
pp. 01005 ◽  
Author(s):  
Y. Galerkin ◽  
A. Drozdov ◽  
A. Rekstin
Keyword(s):  
Test Data ◽  
Centrifugal Compressor ◽  
Inviscid Flow ◽  
Flow Coefficient ◽  
Performance Modelling ◽  
Math Model ◽  
Compressor Impeller ◽  
Total Temperature ◽  
Compressor Performance ◽  
Design Characteristics

The loading factor performance modelling is an important part of centrifugal compressor performance calculation. The presented information on model stages’ test data confirms the fact that the loading factor versus flow coefficient at an impeller exit is a linear function independent of Mach number (subsonic flow). The test data and the design characteristics of the series of 10 model stages are compared with the calculation of an inviscid flow and with calculations done using the NUMECA software. Math models offered by the authors, and inviscid calculations solve the problem of a primary design. The CFD-calculation for final solution is non-satisfactory. If the loading factor is calculated by total temperature difference and flow coefficient is calculated by a continuity equation, the performance is not quite linear and lies much higher. For the considered stages CFD-calculation inaccuracy is + (0,06 … 0,12). CFD-calculated flow coefficient is inside 0,96 … 0,98 of the measured and of the calculated by the Math model.

Horizontal Well IPR Calculations

1998 ◽  
Vol 1 (05) ◽  
pp. 392-399 ◽  
Author(s):  
L.K. Thomas ◽  
B.J. Todd ◽  
C.E. Evans ◽  
R.G. Pierson
Keyword(s):  
Horizontal Well ◽  
Numerical Solutions ◽  
Horizontal Wells ◽  
Technical Conference ◽  
Flow Coefficient ◽  
Darcy Flow ◽  
Analytical And Numerical Solutions ◽  
Original Manuscript

This paper (SPE 51396) was revised for publication from paper SPE 36753, first presented at the 1996 SPE Annual Technical Conference and Exhibition, Denver, Colorado, 6-9 October. Original manuscript received for review 24 October 1996. Revised manuscript received 23 October 1997. Paper peer approved 7 July 1998. Summary This paper presents the calculation of near-wellbore skin and non-Darcy flow coefficient for horizontal wells based on whether the well is drilled in an underbalanced or overbalanced condition, whether the well is completed openhole, with a slotted liner, or cased, and on the number of shots per foot and phasing for cased wells. The inclusion of mechanical skin and the non-Darcy flow coefficient in previously published horizontal well equations is presented and a comparison between these equations is given. In addition, both analytical and numerical solutions for horizontal wells with skin and non-Darcy flow are presented for comparison. P. 392

Sign in / Sign up

Export Citation Format

Share Document