Roller Centralizer

Two rows of rollers are horizontally installed on the centralizing edge of the roller centralizer, and the roller axis of the centralizer is perpendicular to the wellbore axis. When the casing enters the inclined well section, on the one hand, the large section of the casing body is not close to the low side of the wellbore, and the friction area is reduced; on the other hand, due to the rolling of the rollers, the sliding friction during conventional casing running It becomes rolling friction, which greatly reduces the friction coefficient between the casing and the well wall, and makes the casing enter the well smoothly.

Product feature

The centralizer of the spiral casing centralizer has an angle with the axis, which is superior to the conventional straight edge type in use: First, when the well diameter is irregular, the well wall produces a certain lateral force against the spiral centralizer during the casing running process. This can reduce the impact of resistance; the second is that in the outer annulus of the pipe, when the cement slurry passes through the spiral of the centralizer, a swirling flow is generated, which changes smoothly and washes the virtual mud cake on the shaft wall. The length of the swirling flow is generally 7-9m. The best one is 3-4m near the centralizer. Therefore, the cement slurry displacement efficiency can be improved, which is very beneficial to improve the cementing quality.

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