CFD MODELLING OF SEDIMENT TRANSPORT IN ANNULUS

Öz

Determination of the pressure loss with a sufficient accuracy for sediment transport in annulusis one of the major concerns while proper pump systems selections. When the solid particle is present in the annulus, frictional pressure loss increases. Moreover, rotating inner pipe in solid-liquid system decreases pressure losses due to increase of the free flow area in annulus. Because of the complexity of this system, accurate prediction of frictional pressure loss is more difficult than single flow. The result showed that inner pipe rotation in an annulus ease the sediment transport and decrease pressure gradient and critical velocity that is necessary to initiate sediment movement. In this study, sediment transport in annulus has been modelled using Computational Fluid Dynamics (CFD). Extensive experimental study was conducted at a flow loop for various flow rates, pipe rotation speed, and rate of penetration. Pressure drop within the test section was recorded besides the other test parameters. To verify the CFD model, estimated frictional pressure losses are compared with experimental data. Results show that CFD model iscapable of estimating frictional pressure drop

Anahtar Kelimeler

• Pressure loss, CFD, Flow in annulus, liquid-solid flow

İKİ BORU ARASINDAKİ KATI MADDE TAŞINIMININ HESAPLAMALI AKIŞKANLAR DİNAMİĞİ İLE MODELLENMESİ

Öz

İki boru arasındaki katı madde (sediment) taşınımında basınç farkının yeterli bir doğrulukta belirlenmesi, uygun pompa seçiminde en fazla dikkat edilmesi gereken konulardan birisidir. Katı madde sisteme girdiğinde, basınç farkı artmaktadır. Ayrıca, katı - sıvı çift fazlı sistemde içteki borunun dönmesi akış alanındaki artma nedeniyle basınç farkını azaltmaktadır. Sistemin karmaşıklığı nedeniyle, basınç farkının doğru tahmini tek fazlı akışa göre daha zordur. Bu çalışmada, farklı debi, boru dönme ve delme hızları için geniş kapsamlı bir deneysel çalışma gerçekleştirilmiştir. Deneylerden elde edilen sonuçlar, içteki borunun dönmesinin sediment taşınımını kolaylaştırdığı ve sedimetlerin taşınımı için gerekli olan kritik akış hızını ve basınç gradyanını düşürdüğünü göstermiştir. İki boru arasındaki sediment taşınımı Hesaplamalı Akışkanlar Dinamiği (HAD) kullanılarak modellenmiştir. Diğer parametrelerin yanında basıç farkları da kaydedilmiştir. HAD modelini doğrulamak için basınç farkları deneysel verilerle kıyaslanmıştır. Sonuçlar, HAD modelin basınç farkını yeterli doğrulukta tahmin edebildiğini göstermiştir

Anahtar Kelimeler

• Basınç farkı, HAD, İki boru arası akış, Sıvı-katı akışı

Kaynakça

1. Acaroğlu E.R., ‘’Basınçlı Akımlarda Katı Madde Taşınımı’’, İnşaat Mühendisleri Odası Türkiye İnşaat Mühendisliği, IV. Teknik Kongresi, Rap No: 31, Ankara, 1968.
2. Kokpınar M.A., Gogus M., ‘’ Critical Flow Velocity In Slurry Transporting Horizontal Pipelines’’, J. Haydraul.Eng., 2001, 127 (9): 763-771.
3. ASCE. (1975). Sedimentation engineering, Manuals and reports on engineering practice No. 54, V. A. Vanoni, ed.
4. Durand R., ‘’ Basic relationships of the transportation solids in pipes-Experimental research’’, Proc. Minnesota Int. Hydr. Conf., 89-103.
5. Ozbayoglu M.E., Saasen A., Sorgun M., Svanes K., “ Critical Fluid Velocities for Removing Cuttings Bed Inside Horizontal and Deviated Wells” , Petroleum Science and Technology, 28: 6, 594-602, 2010.
6. Zandi, I., and Gavatos, G., ‘’ Heterogeneous flow of solids in pipelines’’, J. Hydr. Div., ASCE, 93 (3), 145-159.
7. Kjosnes I., Loklingholm G., Saasen A., Syrstad S.O., Agle A., And Solvang K.A.; “Successful Water Based Drilling Fluid Design for Optimizing Hole Cleaning and Hole Stability”, SPE 85330, Presented at SPE/IADC Middle East Drilling Techology Conference and Exhibition, abu Dhabi, UAE, 20-22 October, 2003
8. Saasen A. And Loklingholm G.; “The Effect of Drilling Fluid Rheological Properties on Hole Cleaning”, SPE 74558, Presented at IADC/SPE Drilling Conference, Dallas TX, 26- 28 February, 2002.

9. Saasen A., Eriksen N.H., Han Liqun, Labes P. And Marken D., “Is Annular Friction Loss the Key Parameter?”, Oil Gas European Magazine, (1)1998, pp.22-24
10. Doron, P., Granica, D., and Barnea D.,“ Slurry Flow in a Horizontal Pipes-Experimental and Modeling”, Int.J. Multiphase Flow, 13, 1987, 535-547.
11. Doron, P. and Barnea D., ’’Slurry Flow in Horizontal Pipes- A Three-Layer Model for Solid-Liquid Flow in Horizontal Pipes’’, Intl. Jour. of Multiphase Flow, 19, 1993, pp. 1029-43.
12. Larsen, T.I., A.A. Pilehvari And J.J. Azar: “Development of a New Cuttings Transport Model Drilling&Completion, Jun. 1997, pp. 129-35. Wellbores Including Horizontal Wells”, SPE
13. Nguyen, D. and Rahman S.S.: “A Three-Layer Hydraulic Program for Effective Cuttings Transport and Hole Cleaning in Highly Deviated and Horizontal Wells”, SPE Drilling & Completion, Sep. 1998, pp. 182-9.
14. Ramadan A., Skalle P., Saasen A.,’’ Application of a three-layer modeling approach for solids transport in horizontal and inclined channels’’, Chemical Engineering Science, 60 (2005), 2557-2570.
15. Alizadehdakhel A., Rahimi M., Sanjari J. , Alsairafi A.A.,’’ CFD and Artificial Neural Network Modeling of Two-Phase Flow Pressure Drop’’, Int Commun Heat Mass Transfer; 36(8):850–6, 2009.
16. Sun X., Wang K., Yan T., Shao S. ve Jiao J., ‘’Effect of Drillpipe Rotation on Cuttings Transport Using Computational Fluid Dynamics (CFD) in Complex Structure Wells’’, Journal of Petroleum Exploration and Production Technology, 4(3), 255-261, 2014.
17. Sorgun M., Ozbayoglu M.A., Ozbayoglu E.M., ‘’Support Vector Regression and Computational Fluid Dynamics Modeling of Newtonian and Non-Newtonian Fluids in Annulus With Pipe Rotation’’, J. Energy Resour. Technol. 137(3), 032901 Ekim 21, 2014.
18. Akhshik S., Behzad M. ve Rajabi M., ‘’CFD-DEM Approach to Investigate the Effect of Drill Pipe Rotation on Cuttings Transport Behavior’’, Journal of Petroleum Science and Engineering, 2015.
19. Fu T.K., Osgouei R.E. ve Ozbayoglu E.M., ‘’CFD Simulation of Solids Carrying Capacity of a Newtonian Fluid through Horizontal Eccentric Annular’’, In Proceedings of the ASME 2013 Fluids Engineering Division Summer Meeting July (pp. 7-11), 2013.
20. Van Wachem B.G.M., Almstedt A.E.,’’Methods for Multiphase Computational Fluid Dynamics’’, Chemical Engineering Journal 96, 81–98, 2003.
21. Eesa M. ve Barigou M., ‘’CFD Investigation of The Pipe Transport Of Coarse Solids in Laminar Power Law Fluids’’, Chemical Engineering Science, 64(2), 322-333, 2009.
22. Enwald H., Peirano E., Almstedt A.,’’Eulerian Two-Phase Flow Theory Applied to Fluidization’’, International Journal of Multiphase Flow 22, 21–66, 1996.
23. ANSYS Version 12.1, ANSYS Workbench CFX, ANSYS Inc, 2009.
24. Sorgun M., Aydin I. ve Ozbayoglu M.E.,’’ Friction Factors for Hydraulic Calculations Considering Presence of Cuttings and Pipe Rotation in Horizontal/Highly-Inclined Wellbores’’, Journal of petroleum science and engineering, 78(2), 407-414, 2011.