Close-In : (vb.) Well Completions. To close a valve to stop or isolate fluid flow. The term is most commonly applied to "closing-in the well, " meaning isolation of the wellbore by closing the master valve. See: closed-in well
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}