bottom hole assembly tools

Aug 14th, 2016
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StabilizersStabilizers, by centralizing the drill string at selected points in the borehole, perform these important functions:They ensure that the weight of the drill collars is concentrated on the bit.They reduce torque and bending stresses in the drill string.They prevent wall-sticking or key-seating of the drill collars.They can be used to build, drop or maintain hole angle in directional drilling, and maintain constant bitdirection in straight-hole drilling.The type and placement of stabilizers in the drill string depends on local drilling conditions and well objectives.In areas with a tendency toward crooked drilling, the stabilizer(s) immediately above the bit must have adequate wallcontact to provide bit stability and guidance. The stabilizer(s) must also have wear properties that permit them to stayin gauge for the life of the bit, and they must be able to centralize the drill string without digging into the borehole wall.In an angle-holding, or packed-hole assembly, which requires maximum stiffness to "lock in" the direction of the drillstring, the stabilizers should have the largest possible cross-sectional area that will permit adequate circulationpassage.For packed-hole drilling techniques, stabilizers act like drill bushings to minimize drift and hole angle change bycentering the drill string. When utilizing a pendulum, or angle-dropping assembly, stabilizers are frequently used toincrease the effectiveness of pendulum by proper

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