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This is a downhole equipment used in the bottom hole assembly (BHA) of a drill
As the name implies, its purpose is to mechanically stabilize the BHA in the
borehole in order to avoid unintentional sidetracking, vibrations, and ensure the
quality of the hole being drilled.
It is composed of a hollow cylindrical body and stabilizing blades, both made of
high-strength steel. The blades can be either straight or spiralled, and are hard
faced for wear resistance.
Several types of drilling stabilizers used in the oilfield today include: the norm
|Replacement sleeve stabilizer, where the baldes are located on a sleave, |
|which is then screwed on the body. This type can be economical when no |
repair facilities are available close to the well being drilled and air freight has
to be used.
|Welded blades stabilizers, where blades are welded onto the body. This type |
|is usually not advised on wells due to the risks of losing blades, but is |
regularly used when drilling water wells or on low-cost oilfield.