Connector for perforating gun system
A perforating gun connection whereby a signal may be carried from surface, down through a wireline or other conveyance, and across the connection from the pin on one perforating gun to an electrical contact structure on the next perforating gun in the string. In an example, the connection includes a connector body with an electrical pin positioned for contact with an electrical contact structure on the next perforating gun. The electrical contact structure has a contact tab aligned for engagement by the pin when connected with the connector body. The electrical contact structure may be unitarily formed to include a number of features to facilitate connection between perforating guns.
1. A perforating gun connection, comprising:
a connector body, comprising:
a first end positionable within a first perforating gun; and
a second end, opposite the first end, positionable within a second perforating gun;
a pin carried on the connector body,
wherein the pin extends through the second end, and
wherein the pin is configured to make electrical contact with the second perforating gun; and
an electrical contact structure coupled to a signal conductor of the second perforating gun, wherein the electrical contact structure comprises:
a free end with a contact tab which is aligned for engagement with the pin upon positioning the second end within the second perforating gun; and
a spring element, coupled with the contact tab, which elastically deforms in response to the contact tab engaging with the pin.
2. The perforating gun connection of claim 1 , further comprising:
an alignment fixture on the second perforating gun defining a contact receptacle, wherein the contact tab is movably disposed within the contact receptacle for engagement by the pin upon positioning the second end of the connector body in the second perforating gun.
3. The perforating gun connection of claim 2 , further comprising:
a feedthrough on the connector body axially extending toward the contact receptacle on the alignment fixture, with the pin extending therethrough.
4. The perforating gun connection of claim 2 , wherein the electrical contact structure further comprises a fixed end coupled with the spring element and secured within a bore of the alignment fixture to centralize the contact tab for engagement by the pin.
5. The perforating gun connection of claim 4 , wherein the fixed end of the electrical contact structure comprises an alignment feature comprising three non-coplanar edges that cooperate to centralize the contact tab.
6. The perforating gun connection of claim 4 , wherein the fixed end of the electrical contact structure comprises an alignment feature including a tubular post having a generally cylindrical outer shape.
7. The perforating gun connection of claim 1 , wherein the connector body comprises a bulkhead with one or more sealing members disposed on the bulkhead for pressure-isolating the first perforating gun from the second perforating gun.
8. The perforating gun connection of claim 1 , wherein the spring element of the electrical contact structure comprises at least two bends unitarily formed with the electrical contact structure.
9. The perforating gun connection of claim 8 , wherein the at least two bends of the spring element comprise a first bend having a first width and a second bend having a second width, wherein the first bend overlaps the second bend such that an overall width of the spring element is less than a sum of the first and second widths.
10. The perforating gun connection of claim 1 , wherein a contact surface area of the contact tab is at least four times a contact region between the contact tab and the pin.
11. The perforating gun connection of claim 1 , wherein a contact surface area of the contact tab is at least twenty-five times a contact region between the contact tab and the pin.
12. The perforating gun connection of claim 1 , wherein the contact tab is circular and flat.
13. The perforating gun connection of claim 1 , wherein the contact tab is circular and is concave or convex.
14. An apparatus, comprising:
a connector body positionable within a perforating gun;
a pin carried on the connector body; and
an electrical contact structure coupled to a signal conductor of the perforating gun, wherein the electrical contact structure comprises:
a free end with a contact tab which is aligned for engagement with the pin upon positioning the connector body within the perforating gun,
a spring element coupled with the contact tab, which elastically deforms in response to the contact tab engaging with the pin; and
a fixed end unitarily formed with the spring element to centralize the contact tab for engagement by the pin.
15. The apparatus of claim 14 , further comprising:
an alignment fixture on the perforating gun defining a contact receptacle, wherein the contact tab is movably disposed within the contact receptacle for engagement by the pin upon connecting the connector body to the perforating gun; and
a feedthrough on the connector body axially extending toward the contact receptacle, with the pin extending through the feedthrough.
16. The apparatus of claim 15 , wherein the fixed end is secured within a bore of the alignment fixture.
17. The apparatus of claim 14 , wherein the connector body comprises a bulkhead with one or more sealing members disposed on the bulkhead for pressure-isolating the perforating gun.
18. The apparatus of claim 14 , wherein the fixed end of the electrical contact structure comprises an alignment feature comprising either three non-coplanar edges that cooperate to centralize the contact tab or a tubular post having a generally cylindrical outer shape.
19. The apparatus of claim 14 , wherein the spring element of the electrical contact structure comprises at least two bends unitarily formed with the electrical contact structure.
20. The apparatus of claim 19 , wherein the at least two bends of the spring element comprise a first bend having a first width and a second bend having a second width, wherein the first bend overlaps the second bend such that an overall width of the spring element is less than a sum of the first and second widths.