Heat treated coiled tubing

A method of heat treating a coiled tubing, the coiled tubing comprising a pipe, wherein the method comprises:

• unspooling the coiled tubing;
• heating the unspooled coiled tubing to a temperature above Ac3;
• quenching the unspooled coiled tubing;
• tempering the unspooled coiled tubing, wherein the tempering is executed in a straight tube heat treatment;
• and
• a second tempering stage wherein the unspooled coiled tubing is tempered while bent.

A method of heat treating a tubing, wherein the tubing comprises a pipe, wherein the method comprises:

• providing the pipe in an uncoiled configuration;
• heating and quenching the pipe in the uncoiled configuration;
• tempering the pipe in the uncoiled configuration without any bending of the pipe during the tempering, wherein the yield strength of the pipe as-tempered is less than the yield strength of the pipe as-quenched, and wherein the tempering is executed in a straight tube heat treatment;
• and
• applying an additional tempering to the pipe while the pipe is being bent.

A method of producing tubing, comprising:

• providing a pipe in an unspooled configuration;
• heating the unspooled pipe to a temperature above Ac3;
• quenching the unspooled pipe;
• tempering the unspooled pipe in a first tempering operation, the first tempering operation being applied to the unspooled pipe with the unspooled pipe in a straight configuration without bending;
• and
• tempering the pipe in a second tempering operation, wherein the pipe during the second tempering operation is bent in a coiling process to coil the pipe onto a spool.