Pipe string tie-back connector

Abstract From the Canadian patent

A pipe connector for establishing a remote connection between a riser pipe and a subsea wellhead. The connector comprises a plurality of annular elements interconnected by a differential thread system which facilitates making up and breaking the riser-wellhead connection from a drilling platform or other surface location without rotation of the riser or diver assist. The preferred embodiment also includes a provision for establishing a metal-to-metal seal between the connector and the wellhead, and a guide assembly to assure proper alignment of the connector with the wellhead prior to completing the connection.