Device and method for positioning a detonator within a perforating gun assembly
According to an aspect, a detonator positioning device is provided for use with a wireless detonator in a perforating gun assembly. The detonator positioning device includes a single mechanism for physical electrical connection, while the remaining electrical connections are made via electrically contactable components. A method of assembling the perforating gun assembly is also provided, including a detonator positioning device configured to receive and hold the wireless detonator.
1. A detonator positioning device for positioning a wireless detonator in a perforating gun assembly, the device comprising:
a cylindrical body comprising an open end, a closed end, and a central bore adapted for receiving the detonator, the central bore extending along at least some of a length of the cylindrical body, the central bore including an enlarged bore portion adjacent the open end of the cylindrical body;
a plurality of arms extending toward the open end of the cylindrical body and at least partially enclosing the enlarged bore portion of the central bore, each of the plurality of arms adapted to retain a detonator head of the detonator when the detonator is positioned within the enlarged bore portion of the central bore; and
a plurality of legs extending from the cylindrical body and toward the closed end of the cylindrical body, each of the plurality of legs adapted to position the cylindrical body in the perforating gun assembly.
2. The detonator positioning device of claim 1 , further comprising:
a line-out connector biasing member positioned within the central bore of the cylindrical body between the detonator head and a base of the enlarged bore portion;
a terminal adapted for connecting a line-out wire, the terminal positioned between the detonator head and the line-out connector biasing member; and
a ground connector biasing member positioned within the central bore between a detonator housing of the detonator and the closed end of the cylindrical body.
3. The detonator positioning device of claim 2 , further comprising:
a grounding strip embedded in the closed end of the cylindrical body, the grounding strip positioned in contact with the ground connector biasing member.
4. The detonator positioning device of claim 1 , wherein each of the plurality of arms comprises a retainer adapted for the retaining of the detonator head, and each of the plurality of legs comprises a protrusion extending away from the cylindrical body and adapted for the positioning of the cylindrical body, wherein each of the plurality of arms and the plurality of legs are flexible such that insertion of the detonator within the central bore and insertion of the cylindrical body within the perforating gun assembly is accomplished with a snap fit.
5. The detonator positioning device of claim 1 , wherein the cylindrical body, the plurality of arms, and the plurality of legs are made from plastic and formed as a unitary member.
6. The detonator positioning device of claim 1 , wherein the cylindrical body further comprises:
a first portion, wherein the plurality of arms form at least a portion of a forward end of the first portion;
a second portion; and
a third portion extending circumferentially from an outer surface of the second portion, the third portion having a forward face and a rearward face, and the plurality of legs extending from the rearward face of the third portion.
7. The detonator positioning device of claim 6 , wherein the third portion is discontinuous about the outer surface of the second portion to form a plurality of sections.
8. The detonator positioning device of claim 6 , wherein the enlarged bore portion is positioned within the first portion of the cylindrical body and the central bore extends along a majority of the length of the cylindrical body.
9. The detonator positioning device of claim 6 , wherein the third portion comprises a circumferentially-extending lip at a distal end thereof, the distal end being positioned opposite the plurality of legs, the lip adapted for positioning the cylindrical body by working in concert with the plurality of legs to hold the cylindrical body in place within the perforating gun assembly.
10. The detonator positioning device of claim 1 , wherein the cylindrical body is a multi-part cylindrical body, the-multi-part cylindrical body comprising at least a first part and a second part, wherein the first part is removably connected to the second part of the cylindrical body to form an assembled cylindrical body, each of the first part and the second part including at least a first portion and a second portion, and each of the plurality of legs comprising a protrusion extending away from the assembled cylindrical body and adapted for positioning the assembled cylindrical body in the perforating gun assembly.
11. The detonator positioning device of claim 10 , further comprising:
a plurality of couplers adapted for attaching the first part of the assembled cylindrical body to the second part of the assembled cylindrical body.
12. The detonator positioning device of claim 10 , wherein the first part and the second part are configured as symmetrical halves.
13. The detonator positioning device of claim 10 , further comprising:
a line-out connector biasing member positioned within the central bore of the assembled cylindrical body between the detonator head and a base of the enlarged bore portion;
a terminal adapted for connecting a line-out wire, the terminal positioned between the detonator head and the line-out connector biasing member; and
a ground connector biasing member positioned within the central bore between a detonator housing of the detonator and the closed end of the assembled cylindrical body.
14. A perforating gun assembly comprising:
a perforating gun housing;
a wireless detonator; and
a detonator positioning device for positioning the perforating gun housing, the detonator positioning device comprising:
a multi-part cylindrical body comprising at least a first part and a second part, wherein the first part is removably connected to the second part of the cylindrical body to form an assembled cylindrical body, each of the first part and the second part including at least a first portion and a second portion, the assembled cylindrical body comprising an open end, a closed end, and a central bore adapted for receiving the detonator, the central bore extending along at least some of a length of the assembled cylindrical body, and the central bore including an enlarged bore portion adjacent the open end of the assembled cylindrical body,
a plurality of arms extending toward the open end of the assembled cylindrical body and at least partially enclosing the enlarged bore portion of the central bore, each of the plurality of arms comprising a retainer adapted to retain a detonator head of the detonator when positioned within the enlarged bore portion of the central bore, and
a plurality of legs extending from the assembled cylindrical body and toward the closed end of the assembled cylindrical body, each of the plurality of legs comprising a protrusion extending away the assembled cylindrical body and adapted for positioning the assembled cylindrical body in the perforating gun housing.
15. The perforating gun assembly of claim 14 , further comprising a third portion extending circumferentially from an outer surface of the second portion, the third portion having a forward face and a rearward face, and the plurality of legs extending from the rearward face of the third portion.
16. The perforating gun assembly of claim 15 , wherein the third portion is discontinuous about the outer surface of the second portion to form a plurality of sections.