Grapple 1 : (n). Well Workover and Intervention. A generic name given to tools that engage on the outer surface of a tubing string or tool assembly, generally for fishing purposes
Schlumberger Ltd. (The World's Leading Supplier Of Technology, Integrated Project Management And Information Solutions to Customers Working in The Oil and Gas Industry Worldwide), Schlumberger Oilfield Glossary Cedex, France 2014. http://www.glossary.oilfield.slb.com/en/Terms/sym/ a.aspx, (Ergo - Brit) {766}