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Centralizer sub optimizes cementing performance

December 1, 2016 By Lenin Diaz Leave a Comment

Centralizer sub optimizes cementing performance

Before we get into the topic of centralizers, I can probably say that I have only personally met and worked with one true casing hardware expert in my 20-year long career. That was 14 or 16 years ago. In those days in Venezuela, it was common for this prominent casing hardware manufacturer to bring experts to assist cementing services companies. These people were responsible for supplying these tools as part of their big well-cementing contracts.

If we think about it, cementing is the only thing that some of us do, and casing centralizers are an inherent part of it. So, How come, I can say that I have only met ONE true expert in casing hardware? Well, you are correct I have met and worked with uncountable casing hardware sales representatives… But, I think it should be clear to all that a sales representative more than likely is not an expert, and sometimes not even an engineer. Don’t get me wrong, I have worked with some pretty good casing hardware and centralizer salespeople with excellent knowledge of their catalogue, but in essence, not experts in the engineering aspects of these tools.

Thanks to my subscription to World oil, I came across this article some time ago, and it caught my attention. Initially, not because of the topic, but because it mentioned the most significant truth there is: “The only thing constant is change” … Then I needed to know, what this has to do with centralization and finally, with cementing. 

BTW. I have to say what I like about the above phrase, “The only thing constant is change“. Well, I like this phrase because sometimesPhoto of a wildcat illustrating an article about casing centralizers people in our industry blindly follow, let’s say, a ‘best practice’ ignoring the fact that ‘best practices’ are not permanent, they have to be revised, they have to be updated. If you are serious about anything in this industry, the only best practice you need is the practice to ‘think’ and have the capacity to learn and change. You have to be adaptable to the constantly changing conditions. This is what engineers do; they are ready to change and to respond to changes.

Returning to the topic, the World Oil article describes a very nice story about improved performance, from the birth of the ‘need’ to the ‘root cause’ identification, development of the solution and dissemination of the practice. This story serves as an example of what is required to achieve success in cementing. We need to be aware of the required ‘change’ and be ready to find solutions.

This article for us as cementing and drilling engineers it is also an excellent example that centralization is not just ‘how many centralizers we use,’ it should as well be taking engineered decisions about the type of centralizers we use.

Please let me know if you find this article useful or if you have any comment

Cheers

L. Diaz

me




 

Taken from world oil – November 2014 /// Vol 235 No. 11

“Well construction requirements are often demanding, and the application of new technologies to past engineering practices is proving successful in modernizing past stagnant designs, such as centralization. 

John Hebert, Blackhawk Specialty Tools

The only thing constant is change. Never has this been truer than with the centralization of casing strings for well construction.

Traditionally, wells were constructed by drilling wellbores and setting casing strings with each subsequent section of the well, telescoping smaller as the well went deeper…

…………..

…………… The challenges of meeting today’s well construction requirements are often demanding. However the application of new technologies to engineering practices is proving successful in modernizing some past stagnant designs, such as centralization.

Armed with a better understanding, proper engineering tools and updated standards, the oil and gas industry can now tackle even more cementing challenges.”

Taken from world oil – November 2014 /// Vol 235 No. 11

John Hebert, Blackhawk Specialty Tools

Related posts:

  1. How many cementing centralizers does one really need for a given well?
  2. Primary Cementing Checklist (Customer)
  3. Misconceptions About Cementing
  4. Workover Cementing Techniques 2: Squeeze Cementing

Filed Under: Equipment, Primary Cementing Tagged With: casing hardware, centraliser, world oil

Article Posted By:

Lenin Diaz is an oil industry specialist with 26 years of technical and operational expertise in fluids, cementing, water control and shut-off. A distinguished track record spanning BP, Schlumberger, and NAPESCO. Lenin lives in Tenerife, Spain and is the creator of this website. Read More…

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