Patent Number: 6,253,861

Title: Circulation tool

Abstract: A tool or sub for use in a well bore is adapted to manipulate the circulation path of fluid through a drill string or work string in which the tool is connected. The apparatus has a body member defining an axial flow path with one or more radial outlets that may be opened or closed by respective valve members in use.

Inventors: Carmichael; Mark (Aboye, GB), Howlett; Paul (Cults, GB)

Assignee: Specialised Petroleum Services Limited

International Classification: E21B 34/00 (20060101); E21B 21/00 (20060101); E21B 21/10 (20060101); E21B 37/00 (20060101); E21B 34/14 (20060101); E21B 034/06 ()

Expiration Date: 07/03/2018