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）
选择提供理论依据，
行封
计计算。
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）选择提供理论依据，行封计计算。
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