Model PRHS Packer is a hydraulic-set production packer. One or multiple packers could be run in hole along with tubing and set at one time or sequentially. A hydraulic setting sub is attached below the packer to build up setting pressure when a setting ball is dropped, once the setting is completed, the ball could be pushed down through the ball seat to avoid plugging the string. It could be used for production, fracturing, acidizing, or other purposes when zonal isolation is required, and is especially suitable for wells with high inclinations, where mechanical and wire line set packers are not the best choice.
The packer is consisted of a set of upper slips, a hydraulic setting module, sealing element and a set of lower slips. Once the packer is set, the lower slips will grab the casing wall and hold the packer in place against downward forces from above the element, while the upper slips will hold the packer against forces from below, forming a bi-directional grip. The upper slips are actuated by a differential pressure acting across the elements from below, not from the pressure within the tubing. This allows the tubing to be plugged below the packer and the packer will continue to hold differential pressure from below. Releasing and retrieving is accomplished by an upward pull on the tubing string.