Full Content is available to subscribers

Subscribe/Learn More  >

The Effect of Constant and Variable Eccentricity on the Spacer Performance During Primary Well Cementing

[+] Author Affiliations
Muhammad Zulqarnain, Mayank Tyagi

Louisiana State University, Baton Rouge, LA

Paper No. OMAE2014-24686, pp. V005T11A035; 8 pages
  • ASME 2014 33rd International Conference on Ocean, Offshore and Arctic Engineering
  • Volume 5: Materials Technology; Petroleum Technology
  • San Francisco, California, USA, June 8–13, 2014
  • Conference Sponsors: Ocean, Offshore and Arctic Engineering Division
  • ISBN: 978-0-7918-4545-5
  • Copyright © 2014 by ASME


Spacers are the intermediate fluids in the primary cementing process, preceded by the mud and followed by the cement. They help in mud removal, keep mud and cement separated and prepare the annulus walls for a good cement bond. The focus of this study is to analyze the spacer performance in keeping mud and cement separated in the vertical and horizontal well sections with eccentricity. Several combinations of eccentricity variation and displacement rates are simulated using Computational Fluid Dynamics (CFD) tool to analyze the temporal and spatial fluid volume fraction distributions in the annulus and validated against multi-fluid displacement experiments. A 50 ft vertical section with annular gap of 1.5″ and casing standoff from 5% to 100% and a horizontal section with variable eccentricity are studied. For initial conditions the annulus is modeled as filled with mud and subsequently swept by one annular volume of spacer and cement each respectively. Mud and cement are treated as Herschel Bulkley fluids and spacer as a Newtonian fluid.

Qualitative results from simulations are shown in the form of volume fraction contour plots at different sections of the annulus and quantitative results in the form of temporal and spatial volume fraction of each fluid at specific planes in the entire annulus. For a vertical annular section with constant eccentricity, some unswept mud is observed on the narrow side and eventually becomes trapped after the eccentricity is increased above a threshold value. It is also observed that increasing displacement rate helps in displacing some of this trapped mud. After a threshold eccentricity value, the trapped mud cannot be displaced and the spacer and cement follow the path of least resistance and flow occurs mainly on the wider side of the annulus. For a horizontal section with variable eccentricity (maximum at the mid distance between centralizers), the flow is observed to move towards wider side around the center and then returning to the other side (narrow part) after passing through middle section. Some trapped mud is also observed in the vicinity of the middle section due to local maximum eccentricity.

Copyright © 2014 by ASME



Interactive Graphics


Country-Specific Mortality and Growth Failure in Infancy and Yound Children and Association With Material Stature

Use interactive graphics and maps to view and sort country-specific infant and early dhildhood mortality and growth failure data and their association with maternal

Citing articles are presented as examples only. In non-demo SCM6 implementation, integration with CrossRef’s "Cited By" API will populate this tab (http://www.crossref.org/citedby.html).

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In