Thru-tubing stackable perforating gun system and method for use
AssigneeBaker Hughes Incorporated
InventorsJames A. Rochen, Kare-Jonny Haugvaldstad, Timothy W. Sampson
Life of this patent
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Abstract
A stackable thru-tubing perforating gun system for use in perforating in a large diameter cased wellbore below a smaller diameter production tubing string. The system comprises a thru-tubing retrievable bridge plug for supporting a lower perforating gun section. The system further comprises at least one additional gun section stacked on top of the lower gun section. After firing, individual gun sections may be retrieved from the wellbore through the tubing string.
Claims6
A method of perforating a casing of a well below a smaller diameter production tubing string, comprising the steps of:
- conveying a through tubing retrievable bridge plug through the production tubing string into the casing;
- setting the through tubing retrievable bridge plug into engagement with the casing;
- lowering a first perforating gun section through the tubing;
- landing the first perforating gun section onto the through tubing retrievable bridge plug;
- lowering at least one additional perforating gun section through the production tubing;
- landing the first at least one additional perforating gun section onto the first perforating gun section;
- lowering a firing head on to a top perforating gun section;
- firing said perforating gun sections and perforating the casing;
- releasing said through tubing retrievable bridge plug from engagement with the casing after firing the perforating gun sections;
- and
- retrieving the through tubing retrievable bridge plug from the casing through the production tubing.
A well perforating apparatus for perforating a casing of a well below a smaller diameter production tubing string comprising:
- a cased wellbore;
- a production tubing disposed in said wellbore;
- a through-tubing retrievable bridge plug engagable with a portion of a well casing below said production tubing for providing a gun support within the casing;
- a plurality of perforating gun sections, wherein one of said gun sections is a lower gun section being supported by the through-tubing retrievable bridge plug, and the remainder of said gun sections being supported by an adjacent gun section;
- and
- a firing head for activating said gun sections.
Dependencies are inferred from the claim text.