Wellbore perforating devices

• US 8,327,746 B2
• Filed: 04/16/2010
• Issued: 12/11/2012
• Est. Priority Date: 04/22/2009
• Status: Active Grant

• Current Assignee: Schlumberger Technology Corporation (SLB)
• Original Assignee: Schlumberger Technology Corporation (SLB)
• Inventors: Behrmann, Lawrence A., Black, Francois
• Primary Examiner(s): David, Michael
• Application Number:
  US12/761,459
• Publication Number:
  US 20100269676A1
• Time in Patent Office: 970 Days
• Field of Search: 89/11.5, 175 455- 46, 166/297, 102305-310
• US Class Current: 89/1.15
• CPC Class Codes: E21B 43/117 Shaped-charge perforators E21B43/118 takes precedence

Abstract

Wellbore perforating devices are disclosed. In one example, a wellbore perforating device includes a plurality of shaped charges and a holder that holds the plurality of shaped charges so that upon detonation the charges intersect a common plane extending transversely to the holder.

Claims

1. A wellbore perforating device comprising:

a holder extending in a longitudinal direction;

a plurality of shaped charges held by the holder and spaced apart in the longitudinal direction, the plurality of shaped charges comprising an inner charge disposed between a pair of outer charges, each shaped charge of the plurality of shaped charges forming a charge jet upon detonation;

each outer charge of the pair of outer charges tilted toward the inner charge in the longitudinal direction such that upon detonation the respective charge jets intersect a common plane extending transversely to the holder at a predetermined radial distance from the holder; and

each outer charge of the pair of outer charges phased about the longitudinal direction at an azimuth angle that is greater than zero with respect to the inner charge such that upon detonation the respective charge jets do not intersect at a common point on the common plane.

2. A wellbore perforating device according to claim 1, wherein the inner charge is held by the holder at a perpendicular orientation to the longitudinal direction.

3. A wellbore perforating device according to claim 2, wherein upon detonation, the charge jet formed by the inner charge travels outwardly from the holder in a radial direction that is substantially perpendicular to the longitudinal direction and that extends along the common plane.

4. A wellbore perforating device according to claim 1, wherein each outer charge of the pair of outer charges is azimuthally phased within 15 degrees of the inner charge.

5. A wellbore perforating device according to claim 1, wherein each outer charge of the pair of outer charges is azimuthally phased within 30 degrees of the inner charge.

6. A wellbore perforating device according to claim 1, wherein each outer charge of the pair of outer charges is azimuthally phased within 120 degrees of the inner charge.

7. A wellbore perforating device according to claim 1, wherein the pair of outer charges are phased at an azimuth angle greater than zero with respect to each other.