The DA-II Unloader is designed as a high-pressure accessory for compression set packers. This unloader is run above the packer in the open position. After the packer is run to setting depth, the procedures required to set the packer will automatically close the unloader. The J-slot locks in both the open and closed positions. With the packer set and the unloader closed, well operations may proceed.
When run above a compression set packer, this unloader is opened by rotating the tubing 1/4 turn and picking up (standard is right-hand close, right-hand open). After opening the unloader, allow differential pressure to equalize before releasing the packer below.