Threaded coupling connection, Ø168–178 mm




Production string, liners, tail pipes, heavy-wall production string, heavy-wall intermediate string, rotation while cementing, water injection, steam-injection wells



C100HT is a gas tight coupling connection for casing with a patented cone-to-cone seal profile. It is a modification of C100 and features increased ultimate make-up torque.


In oil and gas wells, the С100HT thread connection ensures gas tightness under the following ultimate loads:

  • External pressure—100% as per API5C3;
  • Internal pressure—100% of pipe body;
  • Tensile load—100% of pipe body;
  • Compressive load—70% of pipe body (depending on the standard size);
  • Dogleg severity—up to 20°/100 ft (depending on the standard size).


  • Bench testing for gas tightness and axial failure load, VNIITneft OOO, Samara;
  • Ultimate make-up torque testing, Weatherford, Orenburg


  • Patented seal profile providing the retention of gas tightness under combined and reversal loads;
  • Special design of the pin tip provides for high ultimate make-up torque;
  • Trapezoidal thread profile combined with optimized design of the seal and shoulder providing the retention of gas tightness under dogleg severity of up to 6°/10 m;
  • Internal flushness

ChelPipe Prime C100HT. Technical data sheet (working connection only)

ChelPipe Prime C100HT. Strength properties of pipes

ChelPipe Prime C100HT, Make-up torques