Patent ID: 7413393
Filing Date: 2008-08-19
Classification: B60P

Abstract:
1. A method of unloading a drilling rig substructure at a drilling site, wherein the method comprises the steps: a. transporting the substructure to the drilling site using a truck and a dolly, wherein the truck comprises a first winch, a second winch, and a gooseneck connected to the substructure, and wherein the dolly comprises a plurality of rollers and a sheave block; b. lowering the drilling rig substructure onto the rollers; c. securing the dolly and moving the truck towards the dolly to push the substructure along the rollers; d. disconnecting the gooseneck from the substructure and connecting the gooseneck to the dolly; e. connecting a first wireline from the first winch to the substructure and connecting a second wireline from the second winch to the substructure through the sheave block; f. activating the second winch to pull the substructure along the rollers and disconnecting the second wireline once the substructure contacts the site; g. unsecuring the dolly and moving the truck and the dolly in an opposite direction, wherein the substructure moves on the rollers and onto the site; and h. disconnecting the first wireline.