Two distinct designs of casing centralizers

Casing centralizer is that mechanical device which secures the casing at various locations to keep the casing from contacting the wellbore walls. And basically it helps in continuous annular clearance around the casing allows cement to completely seal the casing to the borehole wall.

 

Since, there is a continuous 360-degree annular space around casing allows cement to completely seal the casing to the borehole wall. This mechanical device helps in keeping the casing away from the wellbore wall. During casing-running operations, the cement may not flow completely around the pipe in these cavernous sections.

 

 

 

The use of off-center rigid centralizers on casing maintains a minimum annular space on the low side of a deviated well. Casing centralizers improve the cementing operations in such wells with whole enlargement problems. In the places where caverns can form causing problems for hole cleaning and cementing operations and deviated wells through carbonates or sloughing formations, rigid centralizers are the solution.

 

Bow Springs Design

There are two distinct designs of centralizers which are bow springs design and the rigid blade design. The bow springs are slightly larger than the wellbore, thus, they can provide complete centralization in vertical or slightly deviated wells. Therefore, they do not support the weight of the casing very well in deviated wellbores.

 

Rigid Blade Design

Rigid blade design is the rugged design which works well in deviated wellbores. Their centralizers are smaller than the wellbore, thus, they will not provide as good centralization as bow-spring type centralizers in vertical wells. Rigid-blade casing centralizers are slightly more expensive and can cause trouble down hole if the wellbore is not in excellent condition.

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