Editing Wireline (cabling) (section)

====Wireline pressure setting assemblies (WLSPA)====
Setting tools are used to set downhole completion elements such as production packers or bridge plugs.  Setting tools typically use the expanding gas energy from a slow-burning explosive charge to drive a hydraulic piston assembly. The assembly is attached to the plug or packer by means of a setting mandrel and a sliding sleeve, which when "stroked" by the piston assembly, effectively squeezes the elastomer elements of the packing element, deforming it sufficiently to wedge it into place in the tubing or casing string. Most completion packers or plugs have a specially designed shear mechanism that release the setting tool from the element allowing it to be retrieved back to surface. The packer/plug, however, remains down hole as a barrier to isolate production zones or permanently plug off a well bore.