TOOL RETAINER

摘要

A tool retainer for use in a line lubricator comprises a tool catcher arrangement for catching a tool and a resilient member which biases the tool catcher arrangement towards a tool catching configuration in which the tool catcher arrangement is capable of catching a tool when the tool is pulled into engagement with the tool catcher arrangement along an axial direction. The tool retainer comprises an indexing arrangement, wherein the tool catcher arrangement and the indexing arrangement are configured to interact so as to selectively release a caught tool in response to a predetermined sequence of axial movements of the tool catcher arrangement. The resilient member may resist axial motion of the tool catcher arrangement under the action of a force exerted on the tool catcher arrangement by the tool as the tool is pulled into a lubricator at the wellhead of an oil or gas well on the end of a line.