Intelligent downhole perforating gun tube and components
A gun tube for a downhole perforating gun assembly includes a body, a first end, and a second end. A motor is directly or indirectly attached to one or both of the ends and is configured to rotate the gun tube around its longitudinal axis in order to position shape charges in the gun tube in a desired position before firing the shape charges. A sensor may be on the gun tube, a sub-assembly, or an outer casing to detect the relative position of the shape charges and a signal including the position of the shape charges could be sent to a human or machine operator.
1. A gun tube comprising:
a body having a cavity, a longitudinal axis, a first end, and a second end;
a first end fitting attached to the first end of the body, wherein the first end fitting comprises:
a bearing housing that includes ball bearings and a central opening; and
a support having a first portion with a first diameter and a second portion with a second diameter that is greater than the first diameter, wherein the bearing housing is positioned on the first portion and the central opening surrounds at least part of the first portion; and
a motor connected to the first end of the body, the motor configured to rotate the body around the longitudinal axis.
2. The gun tube of claim 1 that further comprises a second end fitting attached to the second end of the body.
3. The gun tube of claim 1 that further comprises a sensor configured to detect the location of one or more explosive charges that are coupled to the body.
4. The gun tube of claim 3 , wherein the sensor comprises an accelerometer.
5. The gun tube of claim 3 , wherein the sensor comprises one or more of an accelerometer, a magnetometer, and gyroscope.
6. A system comprising the gun tube of claim 5 and a motor control remote to the gun tube, the motor control configured to operate the motor.
7. The system of claim 6 , wherein the motor control is one of a computer and a cell phone.
8. The system of claim 6 that further includes a receiver for receiving transmissions sent by the sensor.
9. The system of a claim 6 , wherein the motor control is configured to be operated by a human operator.
10. The system of a claim 6 , wherein the motor control is configured to be operated by a machine operator.
11. The gun tube of claim 1 that further comprises one or more charge openings configured to receive an explosive charge.
12. The gun tube of claim 11 that further comprises one or more explosive charges in the one or more charge openings.
13. The gun tube of claim 11 that further comprises one or more clip openings configured to receive charge clips.
14. The gun tube of claim 13 that comprises one or more clips in the one or more clip openings.
15. The gun tube of claim 1 , wherein the first end fitting includes a first end contact having a first, extended position and a second, contracted position, and the gun tube also comprises a second end fitting having a second end contact including a first, extended position and a second, contracted position.
16. The gun tube of claim 15 , wherein the first end contact is biased towards the first, extended position.
17. The gun tube of claim 16 , wherein the second end contact is biased towards the first, extended position.
18. The gun tube of claim 16 that further includes a spring on a housing of the first end contact, the spring configured to bias the first end contact to the first, extended position, and the spring configured to compress when the first end contact moves to the second, contracted position thereof.
19. The gun tube of claim 18 that further includes a spring on a housing of the second end contact, the spring configured to bias the first end contact to the first, extended position, and the spring configured to compress when the first end contact moves to the second, contracted position thereof.
20. The gun tube of claim 15 , wherein the distance between the first, extended position and the second, contracted position of the first end contact is between 0.150″ and 1.250″.
21. The gun tube of claim 20 , wherein the distance between the first, extended position and the second, contracted position of the second end contact is between 0.150″ and 1.250″.
22. The gun tube of claim 1 , wherein the outer collar has one or more openings, wherein at least one of the one or more openings contains grounding hardware biased to a first, extended position, and wherein the grounding hardware also has a second, contracted position.
23. The gun tube of claim 1 , wherein the first end fitting comprises an end contact having a first end that comprises a stem, the stem being positioned inside of the cavity, and the end contact having a second end, the second end comprising an electrical contact that is positioned outside of the body.
24. The gun tube of claim 23 , wherein the end contact is configured to transmit electricity therethrough.
25. The gun tube of claim 1 , wherein the first end fitting comprises a first end contact that includes a housing and one or more frangible elements extending outwardly from the housing.
26. The gun tube of claim 25 that further comprises a second end fitting that includes a second end contact having a housing and one or more frangible elements extending outwardly from the housing.
27. The gun tube of claim 25 , wherein the housing of the first end contact and the one or more frangible elements of the first end contact are comprised of plastic and the one or more frangible elements are configured to break away from the housing of the first end contact upon the application of explosive, outward axial force caused by explosion of one or more explosive charges in the gun tube.
28. A gun tube, comprising:
a body having a cavity, a longitudinal axis, a first end, and a second end;
a first end fitting attached to the first end of the body, wherein the first end fitting includes a first end contact having a first, extended position and a second, contracted position;
a second end fitting attached to the second end of the body, wherein the second end fitting includes a second end contact having a first, extended position and a second, contracted position; and
a motor connected to at least one of the first end and the second end of the body, wherein the motor is configured to rotate the body around the longitudinal axis.
29. A gun tube, comprising:
a body having a cavity, a longitudinal axis, a first end, and a second end;
a first end fitting attached to the first end of the body, wherein the first end fitting comprises an end contact having a first end that comprises a stem, the stem being positioned inside of the cavity, and the end contact having a second end, the second end comprising an electrical contact that is positioned outside of the body; and
a motor connected to the first end of the body, wherein the motor is configured to rotate the body around the longitudinal axis.
30. A gun tube, comprising:
a body having a cavity, a longitudinal axis, a first end, and a second end;
a first end fitting attached to the first end of the body, wherein the first end fitting comprises a first end contact that includes a housing and one or more frangible elements extending outwardly from the housing; and
a motor connected to the first end of the body, wherein the motor is configured to rotate the body around the longitudinal axis.