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Effect of horizontal velocity gradient

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Proceedings Papers

Paper presented at the SPE Annual Technical Conference and Exhibition, October 26–29, 2020
Paper Number: SPE-201403-MS
... quite similar comparisons between flow regimes and air and oil superficial Reynolds numbers (i.e., akin to their superficial velocities). Therefore, the only major change between Figures 2 and 3 is the inclination of the pipe. As seen in the total pressure gradient profiles, just the effect of going...
Proceedings Papers

Paper presented at the International Petroleum Technology Conference, December 3–5, 2008
Paper Number: IPTC-12072-MS
... stress prediction pore pressure prediction international petroleum technology conference gradient velocity function seismic velocity field velocity field minimum horizontal effective stress excess pressure IPTC 12072 Theory and Application of Integrated Pore Pressure Prediction in Deepwater...
Proceedings Papers

Paper presented at the SPE/AAPG/SEG Asia Pacific Unconventional Resources Technology Conference, November 18–19, 2019
Paper Number: URTEC-198287-MS
.... , Zhang , S. ( 2018 ). Pressure transient analysis of multi-fractured horizontal wells in tight oil reservoirs with consideration of stress sensitivity . Arab J Geosci 11 : 285 . 10.1007/s12517-018-3639-7 Wang , Xiukun , Sheng , James J . ( 2017 ). Effect of low-velocity non...
Proceedings Papers

Paper presented at the 2013 SEG Annual Meeting, September 22–27, 2013
Paper Number: SEG-2013-0246
.... Infinitesimal warping from the current image towards its focus can be approximated by a horizontal contraction. The image residual can be then taken as the difference between the warped and the original image to account for the velocity error. Least squares fitting of the effect of a velocity perturbation...
Proceedings Papers

Publisher: BHR Group
Paper presented at the 17th International Conference on Multiphase Production Technology, June 10–12, 2015
Paper Number: BHR-2015-B3
... was gradually changed from −5° to +5°. In-put water cuts from 0 % to 100 % were covered. The mixing velocity was varied from 0.1 m/s to 1.0 m/s . Flow pattern maps, local phase fraction, and pressure gradient measurements are shown. Significant influence of the pipe inclination was found. This effect became...
Proceedings Papers

Paper presented at the SPE Annual Technical Conference and Exhibition, October 8–10, 2012
Paper Number: SPE-159217-MS
.... This effect is not observed in for higher superficial liquid velocities (see Fig. 13 b) because frictional component dominates the total pressure gradient. Similar to horizontal and downward inclined flows, the pressure gradient increases as liquid viscosity and superficial velocities increases. When...
Proceedings Papers

Paper presented at the The 31st International Ocean and Polar Engineering Conference, June 20–25, 2021
Paper Number: ISOPE-I-21-2110
...-independence, a parametric study is carried out to investigate the effect of pipe diameter, mixture velocity, and solid volume concentration on the entry length by analyzing the deviations of pressure drop, hydraulic gradient, solid phase velocity and volume fraction between different cross suctions downstream...
Proceedings Papers

Publisher: BHR Group
Paper presented at the 17th International Conference on Multiphase Production Technology, June 10–12, 2015
Paper Number: BHR-2015-D1
...) the highest mixture velocities covered in their studies were below the values at which phase inversions could be observed. Therefore, this study focuses on experimental investigation of the effects of DRPs on dispersed oil-water flow in horizontal, upward, and downward inclined pipes so as to investigate...
Proceedings Papers

Paper presented at the 2007 SEG Annual Meeting, September 23–28, 2007
Paper Number: SEG-2007-0388
... in this paper is based on the integration of a 3D high resolution and high density velocity field derived from seismic PSTM gathers and acoustic impedance inverted from a calibrated 3D seismic migration volume. The pore pressure gradient, excess pressure, minimum horizontal effective stress volumes resulted...
Proceedings Papers

Paper presented at the SPE Artificial Lift Conference and Exhibition - Americas, August 28–30, 2018
Paper Number: SPE-190965-MS
... frequencies. This is shown in Figure 4 . It was also observed that gas lift injection does not affect the slug frequencies upstream of the point of injection. This is shown in Figure 5 . Figures 12 , 13 and 14 show the effect of deepening the EOT location on toe pressure and pressure gradient...
Proceedings Papers

Paper presented at the 2015 SEG Annual Meeting, October 18–23, 2015
Paper Number: SEG-2015-5882424
... Summary Conventional weighted energy gradient method can reduce the artifacts caused by the geometrical spreading and defocusing effects caused by incomplete data coverage. However, the direct use of weighted energy calculated from initial velocity model will lead to the lack of seismic...
Proceedings Papers

Paper presented at the SPE Latin American and Caribbean Petroleum Engineering Conference, December 1–3, 2010
Paper Number: SPE-136874-MS
... gradient results predicted by the proposed model show a satisfactory agreement with a published model. A sensitivity study is then made (after model validation) using the new model to investigate effects of operating, design and system parameters on pressure gradient and optimal transport velocity under...
Proceedings Papers

Paper presented at the SPE Liquids-Rich Basins Conference - North America, November 7–8, 2019
Paper Number: SPE-197092-MS
... validated analytical multiphase flow simulator to invesitigate and better understand the effect of water cut versus the total pressure gradient, gas volume fraction (gas-liquids slip), wellbore flow pattern, difference of wellbore and critical gas velocities, and slugging flow characteristics...
Proceedings Papers

Paper presented at the 2012 SEG Annual Meeting, November 4–9, 2012
Paper Number: SEG-2012-1555
... SUMMARY Using the Hessian matrix to scale the gradients in full-waveform inversion can reduce the artifacts caused by the geometrical spreading and defocusing effects caused by incomplete data coverage. However, it is computationally expensive to calculate the Hessian matrix. We develop a new...
Proceedings Papers

Paper presented at the SPE Annual Technical Conference and Exhibition, October 1–4, 2000
Paper Number: SPE-62944-MS
... that pressure change occurs in the rear of the slug. This pressure change could be positive or negative. production control drag reduction equation superficial liquid velocity contribution effectiveness reservoir surveillance production logging slug holdup slug body pressure gradient...
Proceedings Papers

Publisher: BHR Group
Paper presented at the 17th International Conference on Multiphase Production Technology, June 10–12, 2015
Paper Number: BHR-2015-D2
... Abstract This paper reports an effort to investigate the effect of flow velocities and inlet configurations on horizontal oil-water flows in a 32 mm ID acrylic pipe using water and an aliphatic oil (Exxsol D140) as test fluids. The flows of interest were analysed using pressure drop...
Proceedings Papers

Paper presented at the SPE Annual Technical Conference and Exhibition, September 28–30, 2015
Paper Number: SPE-174852-MS
... deviation angles. Figure 14 shows similar results for high liquid velocity of v SL =0.1 m/s. Above the critical gas velocity, the increase in liquid flow rate results in a higher pressure gradient with signicant effect of gravity at lower deviation angles. However, surprisingly, below the critical gas...
Proceedings Papers

Paper presented at the SPE Annual Technical Conference and Exhibition, October 9–11, 2017
Paper Number: SPE-187229-MS
... tension had no significant effect on the liquid holdup for 38 < σ < 72 μPa•m. The pressure gradient, however, increased slightly with decreasing surface tension values. Meng (1999) investigated low-liquid-loading flow in horizontal and near horizontal pipes at different inclination angles (−2...
Proceedings Papers

Paper presented at the 50th U.S. Rock Mechanics/Geomechanics Symposium, June 26–29, 2016
Paper Number: ARMA-2016-497
... Abstract: As indicated by Thomsen's landmark paper on seismic anisotropy, delta ( d ) can be positive or negative. Because of this, anisotropy may have an additive or subtractive effect on stress ratios, pore-pressure, tectonic stress and anisotropy gradient predictions for seismic based...
Proceedings Papers

Paper presented at the 2015 SEG Annual Meeting, October 18–23, 2015
Paper Number: SEG-2015-5856899
...- sion. We demonstrated the effectiveness of the method on the HESS VTI model. Results show accurate inversion represen- tations of the reflectivity and a low-frequency representation of both the vertical and horizontal velocities. ACKNOWLEDGMENTS The Authors would like to thank the sponsors...

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