• norsk
    • English
  • English 
    • norsk
    • English
  • Login
View Item 
  •   Home
  • Fakultet for ingeniørvitenskap (IV)
  • Institutt for energi og prosessteknikk
  • View Item
  •   Home
  • Fakultet for ingeniørvitenskap (IV)
  • Institutt for energi og prosessteknikk
  • View Item
JavaScript is disabled for your browser. Some features of this site may not work without it.

MODELING MULTIPHASE FLOW IN DOWNHOLE VALVES

Edvardsen, Svein
Doctoral thesis
Thumbnail
View/Open
NTNU_Svein Edvardsen_avhandling.pdf (39.56Mb)
URI
http://hdl.handle.net/11250/298986
Date
2015
Metadata
Show full item record
Collections
  • Institutt for energi og prosessteknikk [2630]
Abstract
Oil and gas have been produced from onshore and offshore fields for more than

100 years, and production rates are falling for the most easily accessible fields.

New oil fields are found at deeper and more remote areas, and exploration costs

are increasing. A new tool that can enhance the well testing process is a wireline

operated downhole shut-in valve. In order to get as precise as possible results

from the well testing, the two-phase pressure drop across the shut-in valve must be

known.

The flow path through this shut-in valve is however complex and cannot easily be

compared to standard tubing parts and singularities. Frictional pressure losses in

pipes are well understood now and have been studied by a number of authors since

the late forties. Minor pressure losses arise from singularities like bends, contractions,

expansions etc. Two-phase flow minor losses have also been studied by

many authors, but only for well-defined and common shapes like bends, nozzles,

sharp edged contractions etc. In a typical industrial application like the shut-in

valve, the flow path is complex. More research is therefore needed in order to be

able to predict the two-phase pressure drop in a complex flow path. The modeling

methods developed here should hopefully be applicable to other two-phase flow

systems as well.

The main objective for this work is therefore to find methods for modeling twophase

flow in complex geometries with several singularities and changes of cross

section. The work has included design, construction and instrumentation of a full

scale shut-in valve mock-up. A series of experiments have been performed with

two-phase flow of air, water and two different oil types. This provides a valuable

experimental data base for two-phase flow in a typical downhole valve. Furthermore

an in-house simulation tool for 1-D models was implement, verified and validated.

The first achievement in this thesis is the validation of 3-dimensional computational

fluid dynamics (CFD) simulations of single-phase flow in the valve. Provided

that the mesh is properly designed etc. the deviation in pressure drop is only 3-6%

compared to experimental data.

The next achievement is the 1-D modeling of the flow in the valve. This 1-D model

serves as a necessary basis for the two-phase simulations.

The main achievement is the implementation of two-phase flow in the 1-D model.

Two approaches are used. First classical flow pattern independent correlations are

applied, and then the state-of-the-art Unified Comprehensive Model formulation is

introduced. The latter provides the best results with only some 10% deviation in

pressure drop.
Has parts
Paper 1: Edvardsen, Svein; Nydal, Ole Jørgen; Dorao, Carlos Alberto. Two-phase Flow in a Down-hole Shut-in Valve. I: 9th North American Conference on Multiphase Technology 2014. BHR Group 2014

Paper 2: Edvardsen, Svein; Dorao, Carlos Alberto; Nydal, Ole Jørgen. Experimental and numerical study of single-phase pressure drop in downhole shut-in valve. Journal of Natural Gas Science and Engineering 2015 ;Volum 22. s. 214-226 http://dx.doi.org/10.1016/j.jngse.2014.11.034 The article is reprinted with kind permission from Elsevier, sciencedirect.com

Paper 3: Edvardsen, Svein; Dorao, Carlos Alberto; Nydal, Ole Jørgen. Multiphase flow in complex valve geometry. Energy Procedia 2015 s. 91-100 http://dx.doi.org/10.1016/j.egypro.2015.01.012 The article is reprinted with kind permission from Elsevier, sciencedirect.com

Paper 4: Edvardsen, Svein; Dorao, Carlos Alberto; Sundsbø, Per Arne. Sudden expansion and two-phase flow pattern transition in pressure recovery zone

Paper 5: Edvardsen, Svein; Dorao, Carlos Alberto; Nydal, Ole Jørgen. Experimental and numerical study of two-phase pressure drop in downhole shut-in valve with Unified Comprehensive Model formulation. Journal of Natural Gas Science and Engineering 2015 ;Volum 23. s. 440-449 http://dx.doi.org/10.1016/j.jngse.2015.02.024 The article is reprinted with kind permission from Elsevier, sciencedirect.com
Publisher
NTNU
Series
Doctoral thesis at NTNU;
;2015:91

Contact Us | Send Feedback

Privacy policy
DSpace software copyright © 2002-2019  DuraSpace

Service from  Unit
 

 

Browse

ArchiveCommunities & CollectionsBy Issue DateAuthorsTitlesSubjectsDocument TypesJournalsThis CollectionBy Issue DateAuthorsTitlesSubjectsDocument TypesJournals

My Account

Login

Statistics

View Usage Statistics

Contact Us | Send Feedback

Privacy policy
DSpace software copyright © 2002-2019  DuraSpace

Service from  Unit