# US 9,520,219 B2 · Retention member for perforating guns

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 9,520,219 B2
- Document ID: US9520219B2
- Status: Granted
- Kind: B2
- Application number: 11/759,126
- Filed: 2007-06-06
- Published: 2010-10-21
- Granted: 2016-12-13
- Earliest claimed: 2006-06-06
- Assignees: Owen Oil Tools LP
- Applicants: Timothy Edward LaGrange; Lyle W. Andrich; Cory D. Day; Dan W. Pratt
- Inventors: Timothy Edward LaGrange; Lyle W. Andrich; Cory D. Day; Dan W. Pratt
- Web page: https://patentgrep.com/patent/US9520219B2

## CPC

- F42D 1/043: {Connectors for detonating cords and ignition tubes, e.g. Nonel tubes (mounting of detonators in blasting cartridges F42B3/26)}
- E21B 43/117: Shaped-charge perforators (E21B43/118 takes precedence)
- G08B 13/2437: {Tag layered structure, processes for making layered tags}
- G08B 13/2442: {Tag materials and material properties thereof, e.g. magnetic material details}
- H01F 10/131: {containing iron or nickel}
- H10N 35/85: Magnetostrictive active materials
- Y10T 29/49826: Assembling or joining
- Y10T 428/239: Complete cover or casing
- F42D: BLASTING (fuses, e.g. fuse cords, C06C5/00; {for obtaining fluid from wells E21B43/00; for mining or quarrying E21C37/00; for making tunnels or galleries E21D9/006}; cartridges F42B3/00)
- E21B: EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- G08B: SIGNALLING SYSTEMS, e.g. PERSONAL CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H10N: ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A perforating gun includes a charge tube having shaped charges affixed thereto. Each shaped charge includes a radially outward pointing post adapted to receive a detonator cord. A retention member installed on the post provides a compressive force that energetically couples the detonator cord to the post. The radially outermost portion of the retention member is radially flush with or radially recessed relative to the radially outermost portion of each post. In one embodiment, the retention member has a rounded medial portion, a central opening and a pair of locking tabs that point radially inward to the central opening. Each post may include a slot for receiving the detonator cord and a circumferential groove that is adapted to receive the locking tabs.

## Claims

### Claim 1

An apparatus for perforating a wellbore, comprising:
a charge tube;
a carrier tube having an interior bore in which the charge tube is disposed;
a plurality of shaped charges affixed in the charge tube, each shaped charge having a radially outward pointing post having a slot receiving a detonator cord having a circular cross-sectional profile; and
a retention member associated with each post, the retention member including an opening for receiving the post, wherein the retention member includes a medial curved bridge portion that conforms to the profile of the detonator cord, the bridge portion being circumferentially adjacent to the post such that it inhibits axial movement of the detonator cord, substantially all of the retention member being radially recessed relative to the radially outermost portion of the post.

### Claim 2 (depends on 1)

The apparatus according to claim 1, wherein the bridge portion includes a contour portion that conforms to a cross sectional shape of the detonator cord.

### Claim 3 (depends on 2)

The apparatus according to claim 2, wherein the bridge portion includes one of:
(i) two bridge portions;
(ii) a support member; and
(iii) a pair of fingers.

### Claim 4 (depends on 2)

The apparatus according to claim 2, wherein the bridge portion inhibits radial and axial movement of the detonator cord relative to the post.