Objectives:
To investigate casing/riser cleanup methods under various wellbore condition.

To develop a bench-top generalized procedure for casing cleanup based on the results from large scale testing.

To develop a consensus or guidelines on when and to what extent casing/riser cleanup is appropriate, based on member experience and outcome of testing.

Reasons for Casing Cleanup:

• Completion Fluid Contamination
• Invasion Of Mud-Cake Particulate Into Formation Erosion Of Downhole Tools From Mud Solid
• Wireline Tooling Damage And Contamination
• Cementing Efficiency
• Perforation And Fracpack Damage

Overall Procedures:

1. Weigh casing joint sample after aging/weathering.
2. Under static condition, contaminate a casing with mud at temperature for a period of 16 hours
3. Drain the mud out of the casing and use a casing scraper to mechanically clean the casing.
4. Use chemicals to clean the mud residue inside the casing.
5. Collect effluent samples for turbidity and total solids measurements.
6. Weigh casing joint sample after cleaning (after final brine flush).
7. Cut and split the casing at selected points for visual observation.
8. Perform test to determine nature of residue in casing: thin sectioning, mud residue sample from inside the casing for petrography and/or energy disperssive spectrometry.
9. Establish casing surface wettability.
10. Bench scale testing (at least two types) will be conducted in an effort to correlate with the large scale tests.  Adjustments to bench scale test methods will be made as appropriate to more closely correlate with large scale test results.

Membership: Stim-Lab encourages new members so that research continues adding value to participating company's lines of business. There will be two meetings per year to present the research findings. A consensus on when and to what extent cleanup is needed will be established and will only be available to members of the consortium. Membership grants access to the "members only" web site which contains research updates, reports for download, plus any programs or spreadsheets developed within the program. Contact Us  for membership information.