US 4,061,389 AGranted

Combination wire line releasable overshot and pull tool

OwnerV. J. Keller, William T. Taylorinventors

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Abstract

A wire line oil tool adapted for multiple connectors on the bottom. It can be used as an overshot, a fishing neck grapple or an inside grapple. It incorporates an outer body which is annular about a central member. A catch mechanism locks the outer body up or down relative to the inner body. The catch mechanism enables the tool to operate on jarring. On jarring, the two parts move relatively to an up or down position. In the down position, the appendages at the bottom of the tool open to engage a fishing neck or the like. In the up position, it is latched or held. If retrieval of the tool is impeded, subsequent jarring will reverse the catch mechanism and release the fishing neck. The device is particularly adapted to be used on wire line retrieval and running operations. In the event an item is grasped which cannot be retrieved, subsequent jarring will achieve release and retrieval of the tool.

Claims13

Dependent claims

A releasable down hole tool operable on a wireline, comprising

an elongate tubular body adapted to run in a well bore;
an out mandrel slidably positioned about said body;
a connective tool for achieving a down hole operation on relative movement of said body and said mandrel;
a catch means operable on lengthwise movement and cooperative with said body and said body and said mandrel to selectively and releasably repetitively secure said body and said mandrel in first and second relative movement to said connective tool which further operates repetitively between the first and second relative lengthwise positions, each operation occurring on lengthwise movement of said tool and wherein said catch means comprises
1. a groove means formed in said body;
2. a pin carried on said mandrel and captured in said groove means for movement confined therein;
3. wherein said groove means is constructed and arranged in a closed loop enabling repetitive movement as said pin traverses said closed loop;
and
4. including means for limiting movement of the pin in said closed loop groove means to traversing said closed loop groove means in a single direction.

6 more elements

A releasable down hole tool operable on a wireline, comprising an elongate tubular body adapted to run in a well bore;

an out mandrel slidably positioned about said body;
a connective tool for achieving a down hole operation on relative movement of said body and mandrel;
and,
a catch means operable on lengthwise movement and cooperative with said body and said mandrel to selectively and releasably repetitively secure said body and said mandrel in first and second relative movement to said connective tool which further operates repetitively between the first and second relative lengthwise positions, each operation occurring on lengthwise movement of said tool and wherein said catch means comprises a pin in a closed loop groove means with one being supported by said body and the other being supported by said mandrel, and said groove means includes a dead end portion where said pin may enter on relative axial movement between said body and said mandrel as a means for limiting pin movement to a single direction in said groove means.

1 more element

Dependencies are inferred from the claim text.