Retention device for drill pipe transmission line

An apparatus for communicating a signal to or from a downhole tool, the apparatus comprising:

• a drill pipe configured to be rotated to drill a borehole;
• a tubular under axial tension and secured in the drill pipe;
• a retention device comprising a body and an arm extending from the body as one integral piece, the retention device being secured to the tubular and configured to maintain the tubular under the axial tension by having the arm configured to press directly against the drill pipe in order to maintain the tubular under the axial tension;
• and
• a transmission line disposed in the tubular and in an opening of the retention device and in communication with the downhole tool;
• wherein the retention device is sealed to an end of the tubular by a butt weld.

An apparatus for communicating a signal to or from a downhole tool, the apparatus comprising:

• a drill pipe configured to be rotated to drill a borehole;
• a tubular under axial tension and secured in the drill pipe;
• a retention device comprising a body and an arm extending from the body as one integral piece, the retention device being secured to the tubular and configured to maintain the tubular under the axial tension by having the arm configured to press directly against the drill pipe in order to maintain the tubular under the axial tension;
• and
• a transmission line disposed in the tubular and in an opening of the retention device and in communication with the downhole tool;
• wherein the retention device and the tubular do not overlap.

An apparatus for communicating a signal to or from a downhole tool, the apparatus comprising:

• a drill pipe configured to be rotated to drill a borehole;
• a tubular under axial tension and secured in the drill pipe;
• a retention device comprising a body and an arm extending from the body as one integral piece, the retention device being secured to the tubular and configured to maintain the tubular under the axial tension by having the arm configured to press directly against the drill pipe in order to maintain the tubular under the axial tension;
• and
• a transmission line disposed in the tubular and in an opening of the retention device and in communication with the downhole tool;
• wherein the retention device comprises one or more slots at an end and an end of the tubular comprises one or more cooperative fingers configured to interlock with the one or more slots of the retention device.

An apparatus for communicating a signal to or from a downhole tool, the apparatus comprising:

• a drill pipe configured to be rotated to drill a borehole;
• a tubular under axial tension and secured in the drill pipe;
• a retention device comprising a body and an arm extending from the body as one integral piece, the retention device being secured to the tubular and configured to maintain the tubular under the axial tension by having the arm configured to press directly against the drill pipe in order to maintain the tubular under the axial tension;
• and
• a transmission line disposed in the tubular and in an opening of the retention device and in communication with the downhole tool;
• wherein the tubular comprises a first outer diameter at an end face and a second outer diameter away from the end face, the second outer diameter being greater than the first outer diameter, and the opening in the retention device comprises an inner diameter configured to accept the first outer diameter of the tubular but not the second outer diameter.