The Flow Release Spear provides a method of engaging and pulling on fish, or other types of equipment, with a slick inside diameter. As this tool operates hydraulically it can be functioned multiple times. This is an advantage over other standard non-releasable overshots.
The tool can be utilised by setting down weight to engage fish allowing the weight applied to the tool to overcome the internal spring force. To release the overshot from the fish simply apply down weight on the BHA while circulating at a pre-determined flow rate through the tool.
The tool can also be operated by circulating at a pre-determined flow rate through an adjustable orifice. This creates an internal pressure that activates an unbalanced piston allowing the spear grapple to become de-supported prior to entering the fish. This method also allows for jetting to clean fish area.
By changing out the grapple each tool size can engage a range of inside diameters and additionally the flow actuation can also be adjusted by fitting an alternative orifice.