In order to prevent failure of packer and provide theoretical basis for selection of unsetting shear pin, the unsetting force of packer must he calculated in design.
为了防止封隔器在工作过程中失效，并为解封剪钉（或剪环）的选择提供理论依据，必须进行解封力的设计计算。
Shear pin
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Shear pin
A shear pin is a mechanical detail designed to allow a specific outcome to occur once a predetermined force is applied. It can either function as a safeguard designed to break to protect other parts, or as a conditional operator that will not allow a mechanical device to operate until the correct force is applied.
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