US 5,398,753 A · Wireline hydraulic retrieving tool and downhole power generating assembly

Abstract

In wireline operations, it is known to retrieve objects stuck in a well bore by means of a retrieving force applied to the object through the wireline and a wireline pulling tool attached to the wireline and engaged with the object. The present invention provides a wireline retrieving tool which is adapted to apply a large retrieving force on a pulling tool engaged with an object in the well bore without having that force transmitted directly through the wireline. The retrieving tool is adapted to be lowered into the well bore on the wireline to a position where the pulling tool engages the stuck object. Anchoring apparatus in the tool then anchor the tool against the tubular casing or tubing of the well bore and a controlled retrieving force generated in the tool is applied between the casing or tubing and the pulling tool to dislodge the object. A wireline power generating apparatus is provided to provide a controlled force in the interior of a well casing in a well bore.

Claims9

Dependent claims

A wireline retrieving tool assembly for retrieving objects stuck in the interior of a well casing in a bore, the assembly comprising:

(a) upper connecting means for connecting the assembly to a wireline;
(b) lower connecting means for engaging a wireline pulling tool adapted to engage an object stuck in the well casing;
(c) an axially extending mandrel rigidly attached between said upper and lower connecting means;
(d) a tubular housing surrounding the mandrel and axially slidable thereon;
(e) anchoring means adapted to selectively anchor the tubular housing to the interior wall of the well casing to prevent axial movement of the tubular housing;
(f) a fluid motor powered by pressurized fluid supplied by a hydraulic pump driven by an electric motor, the pump and motor being carried in the assembly;
(g) an electrical subsystem for supplying electricity to the electric motor from a power source;
and
(h) wherein said fluid motor is adapted to apply controlled force between said tubular housing and said mandrel causing axial movement between the tubular housing and the mandrel;
the mandrel, lower connecting means and upper connecting means being urged in a retrieval direction when the tubular housing is anchored to the interior wall of the well casing and force is applied by said fluid motor.

7 more elements

A wireline power generating apparatus for application of a controlled force in the interior of a well casing in a well bore, the apparatus comprising

(a) upper connecting means for connecting the apparatus to a wireline;
(b) lower connecting means for engaging a tool requiring the application of a controlled force;
(c) an axially extending mandrel rigidly attached between said upper and lower connecting means;
(d) a tubular housing surrounding the mandrel and axially slidable thereon;
(e) anchoring means adapted to selectively anchor the tubular housing to the interior wall of the well casing to prevent axial movement of the tubular housing;
(f) a fluid motor powered by pressurized fluid supplied by a hydraulic pump driven by an electric motor, the pump and motor being carried in the apparatus;
(g) an electrical subsystem for supplying electricity to the electric motor from a power source;
and
(h) wherein said fluid motor is adapted to apply controlled force between said tubular housing and said mandrel causing axial movement between the tubular housing and the mandrel, the mandrel, lower connecting means and upper connecting means being urged in a predetermined direction when the tubular housing is anchored to the interior wall of the well casing and force is applied by said fluid motor.

6 more elements

Dependencies are inferred from the claim text.

Wireline hydraulic retrieving tool and downhole power generating assembly

Life of this patent

Wireline hydraulic retrieving tool and downhole power generating assembly

Life of this patent

Abstract

Claims9