Method and apparatus for orienting perforating devices
AssigneeSchlumberger Technology Corporation
InventorsRobert A. Parrott, David Mills, Cynthia L. Hickson, Jerry D. Campbell
Life of this patent
Estimating the term…
Abstract
The present invention provides an apparatus and method of orienting perforating gun strings conveyed on a tool string. One embodiment of the present invention provides an orienting weight provided in a portion of the perforating device, such as the shaped charge, the loading tube or the gun housing. An adapter is provided intermediate the tool string that facilitates conveyance of the gun string downhole. Additionally, the adapter enables the gun string to rotate independent of the tool string.
Claims21
A method of conveying and orienting shaped charges, comprising:
- weighting one or more gun string components eccentrically to orient the shaped charges in the desired direction;
- conveying the one or more gun string components downhole on a tool string;
- providing an adapter intermediate the one or more gun string components and the tool string, the adapter having wheels to facilitate conveyance of the one or more gun string components and having a rotating cage to enable the one or more gun string components to rotate independently of the tool string;
- determining the non-uniformity of the bending moment in the one or more gun string components;
- and
- compensating for the non-uniformity of the bending moment.
An oriented perforating gun affixed to a tool string, comprising:
- one or more gun string components, comprising:
- one or more shaped charges having a charge case;
- a gun carrier;
- and
- a loading tube;
- an adapter intermediate the one or more gun string components and the tool string, the adapter having roller wheels to facilitate conveyance of the one or more gun string components downhole and having a rotating housing to enable the one or more gun string components to rotate independently from the rotating housing;
- and
- wherein at least one of the one or more gun string components are eccentrically weighted to orient the shaped charges in a desired direction, wherein the geometry of the charge case of the one or more shaped charges is modified to shift its center of gravity.
An oriented perforating gun affixed to a tool string, comprising:
- one or more gun string components, comprising:
- one or more shaped charges having a charge case;
- a gun carrier;
- and
- a loading tube;
- an adapter intermediate the one or more gun string components and the tool string, the adapter having roller wheels to facilitate conveyance of the one or more gun string components downhole and having a rotating housing to enable the one or more gun string components to rotate independently from the rotating housing;
- and
- wherein at least one of the one or more gun string components are eccentrically weighted to orient the shaped charges in a desired direction, wherein weights are affixed to the charge case of the one or more shaped charges.
Dependencies are inferred from the claim text.