Darren C Nolet

US Patent:

20020020560, Feb 21, 2002

Filed:

Jul 27, 2001

Appl. No.:

09/916226

Inventors:

Wesley Bratton - Richland WA, US
Stephen Farrington - Stockbridge VT, US
James Shinn - South Royalton VT, US
Darren Nolet - Hartland VT, US

International Classification:

E21B007/26

US Classification:

175/020000, 175/058000

Abstract:

A tool latching and retrieval system allows the deployment and retrieval of a variety of direct push subsurface characterization tools through an embedded rod string during a single penetration without requiring withdrawal of the string from the ground. This enables the in situ interchange of different tools, as well as the rapid retrieval of soil core samples from multiple depths during a single direct push penetration. The system includes specialized rods that make up the rod string, a tool housing which is integral to the rod string, a lock assembly, and several tools which mate to the lock assembly.