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Rigid centralizer is effective in centering the casing

2018-03-12 11:56:18

Since, the development of machines in various industries has been so overwhelming that one might lose track of them. No matter what, most of the machine is incredible to pace up the work speed and it is amazing to see how superiorly all of them are designed. Rigid Centralizer is one of the most fantastic machines. It provides mechanism that centers the casing in the hole and allows uniform cement flow around the casing to help protect it at all points. All the models of this centralizer offer ample clearance for fluid passage and are extrally effective in centering the casing.


Efficient in the cementing process, rigid centralizer helps to clean the annulus and distribute the cement more evenly and uniformly. This is great in highly deviated holes as well and also improves cement flow by reducing the effects of channeling. All of the designs of rigid centralizer is provided to keep an optimum flow and its fins or blades overlap the entire 360-degree open whole circumference. The use of off-center rigid centralizers on casing maintains a minimum annular space on the low side of a deviated well. It improves cementing operations in such deviated wells with whole enlargement problems.


Solid Rigid Centralizers


In inclined well, the drilling tools are non-concentrically aligned in the borehole. The axis of the drill string appears below the axis of the borehole. Thus, in inclined wells changes the flow hydrodynamics in the ring space. This change is amplified which leads to the drilled cuttings move up the well along the bottom wall of the hole. Through carbonates or sloughing formations in deviated wells, caverns can cause problems in whole cleaning and cementing operations. Since, in hole-enlargement areas, the flow of both drilling fluid and cement is principally high on the side of the well, between the pipe and the top wall of the well.


Though drill cuttings can also accumulate around the pipe near the caverns. During casing-running process, the cement may not flow completely around the pipe in these cavernous sections. But the study refers that the cavern formation features in inclined wells can give a key to further prediction of technology for their washing and casing cementation. The study of cavern formation features in inclined wells can give a key to further prediction of technology for their washing and casing cementation.


Cavern expansion usually occurs in the direction from the bottom wall to the top wall in an inclined hole. Anisotropy of the formation exposed by an inclined well at an angle to its bedding promotes this tendency. One of the solutions has been the use of Rigid Centralizer as it ensures minimum standoff of the casing and the bottom wall. The use of this centralizer maintains enough annular space completely around the casing to allow better fluid flow.

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