Continuing with these series of posts covering some of the cementing techniques applicable in workover operations, I want to talk further about plug cementing. In previous posts, I have covered extensively plug cementing. This time I am providing information regarding laboratory testing and some considerations when cement plugs intended for well abandonment. Cement Slurry Properties […]
Workover Cementing Techniques. (2) Squeeze Cementing
Squeeze cementing is basically a filtration process that occurs during the placement of the cement slurry into a wellbore entry point (casing leak, existing perforations, etc.) under sufficient differential pressure. The cement slurry is held in place until it cures and establishes a hydraulic seal. Look at this picture in Squeeze Cementing Principles explaining the […]
Workover Cementing Techniques. (1) The Injectivity test
I want to present a series of posts covering cementing techniques applicable during workover, including specific job requirements, fluid characteristics, and testing procedures for each of the following job categories: Remedial cementing, well abandonment, and fluids control/shut-off. I am initiating this series of posts, with an essential step in remedial cementing and the squeeze process: […]
Balanced-plug method. Basic calculations
Free Balanced Plug Calculator at the end of this post. Check it out ! The most common placement method is the balanced plug technique. The work-string is run into the wellbore to the desired depth for the plug base. Contamination or mixing with the control fluid is avoided by the use of appropriate volumes of […]
Come on! move it! push it! … Too late, it’s gelled up! …
Now, please let me tell you more about Cement gelation Why this post? Over a month ago, someone requested some insights about Primary and Secondary cement gelation. Two or three answers were provided, which I think were enough to have a good idea on the topic. However, to be honest, I could not stop thinking […]
Highly deviated or Horizontal well section abandonment?
I have to be honest, it is only recently that I had the opportunity to place frequent cement plugs in such conditions and purpose. Yes, I did those only occasionally before … However, “Frequency” is important, and beside what everybody knows (so-called best practices) Frequency is how the significance of all the variables can be […]
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