Perforated Tubing TP-G2 4-1/2" 13.5ppf L80 PSL2
TPCO are available with different premium thread such as TP-CQ,TP-NF,TP-FJ,TP-G2,TP-EX,TP-QR,TP-G2 HP,TP-ISF,MO-WS series premium connections.
API threads have the following characteristics:
1. It is easy to process, and it is convenient to configure nipples on site, so the cost is low;
2. The design accuracy allows operation under general conditions without serious damage to the thread, and it is easy to repair on site;
3. Meet the fluid seal of 69mpa and 149 ℃ with the cooperation of high-quality sealing grease;
4. Adapt to repeated buckle up for a certain number of times;
5. The connection between the pipe and the coupling is through conical threads, so that the male and female threads remain completely and closely combined at a certain meshing point during the tightening process;
However, under more severe conditions, API threads can not meet the needs of oil and gas wells, such as:
1. In case of ultra-high pressure oil and gas wells, especially high-pressure gas;
2. In corrosive environment, due to the large expansion value (interference value) of API coupling, excessive circumferential stress is the main source of hydrogen embrittlement stress failure or stress-strain crack;
Therefore, non API standard threads can meet seven requirements:
1. The design makes the threaded connection strength equal to the tensile strength of the pipe body, or even greater than the tensile strength of the pipe body;
2. Provide high-quality seal and develop to metal to metal seal;
3. Reduce the interference of coupling radial expansion caused by axial threaded connection;
4. It is easy to buckle and make the inner hole surface smooth to avoid eddy current or small eddy current;
5. It has torque shoulder, which can meet the requirements of torque strength and control without excessive circumferential stress;
