Patent ID: 7900695
Filing Date: 2011-03-08
Classification: E21B

Abstract:
1. A pulling tool for introduction in a well to pull an object from the well wherein the pulling tool is introduced in the well with a wireline, the pulling tool comprising: at least one of a tie bolt and a shoulder for holding the pulling tool in the well; an ejector having a driving side and an inlet; a feed pump that is electrically driven wherein the feed pump is connected to the driving side of the ejector; a hydraulic apparatus connected to the ejector wherein the hydraulic apparatus has a hydraulic cylinder, a piston and a piston rod wherein the piston rod is connected to the piston and further wherein the piston rod is attachable to the object wherein the hydraulic cylinder has an upper chamber and a lower chamber defined by the piston positioned between the upper chamber and the lower chamber wherein the upper chamber has a hydraulic pressure controlled by the ejector and the feed pump wherein the upper chamber is connected to and communicates with the inlet of the ejector and further wherein the lower chamber communicates with the well wherein a reduction in the hydraulic pressure within the upper chamber by the ejector and the feed pump results in an upward displacement of the piston, the piston rod and the object.