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
封剪钉（或剪环）的选择提供理
，必须进行封力的设
。
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，并为封剪钉（或剪环）的选择提供理，必须进行封力的设。
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