How Does Rigid Centralizer Help?

In deviated wells through carbonates or sloughing formations, caverns can form causing problems for hole cleaning and cementing operations. At the time of hole cleaning in extended cavern sections, one can face problems though. The drilling fluid should have high rheological properties to ensure adequate removal of cuttings in formations susceptible to cavern formation. For many cases, it is even necessary to plug or bridge the caverns to reduce the area of the hole. 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.

 

 

While 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. Thus, there comes rigid centralizer, it helps in maintaining a minimum annular space on the low side of a deviated well. It improves cementing operations wells with hole enlargement problems. Rigid centralizers can even assist in the running of the casing and the prevention of differential sticking.

 

The washing of an inclined well plays an important role both during drilling and in preparing the well, so it is important to use rigid centralizer for running and cementing casing. The arch-type caverns cause difficulty in transporting drill cuttings along the bottom wall of an inclined well.

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