Why Is Rigid Centralizer Used?

In deviated wells caverns can form causing problems for hole cleaning and cementing operations through carbonates or sloughing formations. Rigid centralizer is built out of solid steel bars or cast iron, with a fixed blade height and are sized to fit a specific casing or hole size. This type of centralizer is rugged and works well even in deviated wellbores, regardless of the side force. It guarantees standoff and function as bearings during the pipe rotation, but since the centralizers are smaller than the wellbore, they will not provide a good centralization as the bow-spring type centralizers in vertical wells.

 

 

During casing-running process, the cement may not flow completely around the pipe in these cavernous sections. At the time of hole cleaning in extended cavern sections, one can face problems though. This type of centralizer helps in maintaining a minimum annular space on the low side of a deviated well. In areas where hole-enlargement is required, it improves cementing operations wells with hole enlargement problems. It can even assist in the running of the casing and the prevention of differential sticking.

 

 

The drilling fluid should have high rheological properties to ensure adequate removal of cuttings in formations which can form cavern. For many cases, it is even necessary to plug or bridge the caverns to reduce the area of the hole. The rigid centralizer oriented by an orienting ring is availed with an offset aperture and a pump-down ball. This casing centralizer secures around the casing at various locations to keep the casing from contacting the wellbore walls. Efficient in the cementing process, this centralizer helps to clean the annulus and distribute the cement more evenly and uniformly.

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