Arming tandem and locking collar for perforating gun systems
AssigneeHarrison Jet Guns II, L.P.
InventorJames F. Shelton
Life of this patent
Estimating the term…
Abstract
An arming tandem for a perforating gun is provided. The arming tandem includes an internal arming pin that is biased in a retracted position. Detonating the last perforating gun in a gun string forces the arming pin in the immediately adjacent tandem into contact with a grounding plate in the next perforating gun, thereby arming the next perforating gun. The arming pin is biased in the retracted position by a helical compression spring that is contained within a counterbored opening in the arming tandem. An adjacent bulkhead includes a grounding plate that surrounds a contact pin. The grounding plate provides a flat surface for contacting the arming pin and creating a secure connection to ground.
Claims14
A perforating gun assembly comprising:
- a perforating gun including an outer gun barrel, an internal shaped charge positioning tube, and a bulkhead joined to an end portion of the shaped charge positioning tube, the bulkhead including a contact pin and a grounding plate;
- and
- an arming tandem that is joined to the perforating gun, the arming tandem including:
- a threaded outer body including a central through-bore interconnecting first and second female openings of the threaded outer body,
- a pass-through element within the central through-bore of the threaded outer body, the pass-through element being electrically conductive and being surrounded by an insulating sleeve, and
- an arming pin that is laterally offset from the pass-through element, the arming pin being biased away from the grounding plate by a compression spring.
An arming tandem comprising:
- a threaded outer body including first and second female openings, the threaded outer body including a central through-bore interconnecting the first and second female openings;
- an insulating sleeve contained within the central through-bore, the insulating sleeve defining a longitudinal opening therethrough;
- a pass-through element within the longitudinal opening of the insulating sleeve, the pass-through element being electrically conductive;
- and
- an arming pin within a counterbored opening that is laterally offset from the pass-through element, the arming pin being biased in a retracted position.
A perforating gun assembly comprising:
- an arming tandem comprising:
- a threaded outer body including a central through-bore interconnecting first and second female openings of the threaded outer body,
- a pass-through element within the central through-bore of the threaded outer body, the pass-through element being electrically conductive and being surrounded by an insulating sleeve, and
- an arming pin that is laterally offset from the pass-through element, the arming pin being biased away from the grounding plate by a compression spring;
- and
- a perforating gun joined to the arming tandem and including a bulkhead, the bulkhead comprising:
- a cylindrical body,
- a plurality of radial spokes coupled to an outer ring,
- a contact pin protruding from a central opening in the cylindrical body, and
- a grounding plate surrounding the central opening and being electrically isolated from the contact pin.
Dependencies are inferred from the claim text.