Tubing or drill pipe conveyed downhole tool system with releasable wireline cable head

A method of performing downhole operations comprising:

• conveying a downhole tool system downhole on a pipe string, the downhole tool system comprising a side entry sub, a cable head connecting a downhole tool to a cutting sub, and a release releasably connecting a wireline to the cable head;
• activating the release to release the wireline from the cable head;
• applying a force to the wireline to move a trip bushing in the cutting sub with a re-head engaged with the wireline;
• compressing a spring against a ram head secured by shear pins with movement of the trip bushing;
• shearing the shear pins to release the ram head;
• pivoting a cutting device with the ram head to cut the wireline;
• and
• performing downhole operations with the downhole tool.

A downhole tool system comprising:

• a side entry sub comprising a pack-off adapted to receive a wireline;
• a cutting sub comprising:
• a trip bushing engageable by a re-head connected to the wireline;
• the trip bushing being movable by the re-head to compress a spring against a ram head secured by shear pins;
• and
• a pivotally mounted cutting device adapted to be pivoted by the ram head when released by the shear pins and cut the wireline;
• a cable head connecting a downhole formation logging tool to the cutting sub;
• and
• a release releasably connecting the wireline to the cable head.

A method of logging a downhole formation comprising:

• conveying a logging tool system downhole on a pipe string, the logging tool system comprising a side entry sub, a cable head connecting a formation logging tool to a cutting sub, and a release releasably connecting a wireline to the cable head, the wireline exiting the side entry sub through a side entry;
• activating the release to release the wireline from the cable head;
• applying a force to the wireline to move a trip bushing in the cutting sub with a re-head engaged with the wireline;
• compressing a string against a ram head secured by shear pins with movement of the trip bushing;
• shearing the shear pins to release the ram head;
• pivoting a cutting device with the ram head to cut the wireline;
• and
• performing logging operations with the formation logging tool.