How to choose eccentricity
Jan 10, 2019

The specification of the eccentric heel is determined according to the required diameter of the through hole, because it is not required to drill into the bedrock during the construction. After passing through the fracture layer, the impactor can be drilled directly with the drill bit (ie, full drill) In the case of changing the impactor and the drill bit, the main consideration is whether the inner diameter of the casing shoe can pass. The following are some specific dimensions of the eccentric heel:Specifications φ108 φ127 φ146 φ168 φ178.

The maximum size that can pass the drill bit is φ85 φ102 φ120 φ138 φ147.

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