When the packer is lowered to the predetermined position, first lower the tool slightly below the setting position, and then lift the column to a certain height to reach the setting position
When the sealer is down to the predetermined position, first lower the tool to a slightly lower seat seal position, and then the upper lift post to reach the seat seal position at a certain height
When the packer is lowered to the predetermined position, first lower the tool to a little lower than the setting position, and then lift the string to a certain height to reach the setting position<br>