The Working Process of Rigid Centralizer

The rapid industrialization is developing the world in the best way but with that comes the pressure of production as well. Centralizing casing is getting important technical treatment for improving cementing quality for horizontal and high angle deviated wells. Common centralizer is having problems as far as the force bearing status of the centralizer moving in horizontal wellbore is analyzed. The Rigid Centralizer, on the other hand, is developed with eccentric truck.

The Rigid Casing Centralizer is basically a mechanical device which is secured around the casing at various locations. The centralizer is kept away from making further contact with the wall as the device continuous annular clearance around the casing; it allows cement to completely seal around the casing to the borehole wall. The eccentric structure of the tool is introduced and the working principle of adjusting the centralizing azimuth by the automatic rotation of two kinds directions. The lab and field experiments show that the tool can effectively improve the centralizing degree of the casing in horizontal wells.

Some of the Features of Rigid Centralizer:

• It has hollow steel blades with a rounded smooth profile
• The all-steel design can withstand severe wellbore conditions
• It can be used in wells where casing reciprocation and/or rotation is required
• This is available with or without set screws
• This is available in right or straight vane orientation.

It is a well defined fact that each centralizer types and properties vary from each other. The better way to perform is a standoff analysis for each casing before a cementing job. Also, the exact number of Rigid Centralizer required and their placements on the casing are important to make it work properly. It is a quality that the cementing quality for horizontal and high angle deviated wells.

Two Distinct Classes Of Centralizers Are Available In The Market:

1. Bow-Spring Design is an older and a common version of low-cost bow-spring centralizer design. It is a slightly larger design than the wellbore and they can provide complete centralization in vertical or slightly deviated wells. Since, they do not support the weight of the casing; it is very well deviated in wellbores.
2. Rigid Blade Design in the other hand is a rugged design which works well in deviated wellbores. Since the centralizers are smaller than the wellbore, they do not provide as good centralization as bow-spring type centralizers in vertical wells. These are expensive than the bow-sting and can also cause trouble down-hole if the wellbore is not in a fine condition.

Since, the casing centralizer was oriented by an orienting ring; it is availed with an offset aperture and a pump-down ball. This type of Rigid Centralizer is found at various locations to keep the casing from contacting the wellbore walls. While using the casing, you need to make sure that the quality of a cementing job is by preventing mud channeling and poor zonal isolation. Thus, a continuous annular clearance around the casing allows cement to completely seal the casing to the borehole wall.

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