TMK TDS is a thread connection fully compatible with API connections and having two shoulders. During the make-up torque application, the secondary shoulder of the pin comes in contact with the inner shoulder of the box, increasing the contact area, which provides for transmission of higher torque.

This connection is intended for use during well construction and workover, in complicated geological conditions, for drilling wells with high intensity of drift angle build-up.

Standard sizes:

In accordance with GOST 54383, API Spec5DP.

TMK TDS drilling tool joints can be manufactured:

  • with right- or left-handed tool joint thread;
  • of standard or extended length;
  • with a square or tapered shoulder for elevator;
  • with necks of standard or increased outer diameter;
  • with the option of hard-alloy build-up along the outer diameter of the tool joint.

Additional inner shoulder improves the performance of the thread connection in case of excessive torque, tension. It ensures high flexibility of drilling string.

  • Thread pitch is 6.35 mm
  • Taper is 1:6
  • Stab flank angle is +30˚
  • Load flank angle is +30˚
  • Triangular taper thread

Opportunity to manufacture in the required version:

  • High-strength
  • Cold-resistant
  • H2S-resistant

Note: the parameters apply to the API standard connections and TMK TDS connections; the same inner and outer diameters have been selected for comparison.

Comparison of tool joint connections

Pipe size (mm) Thread connection Tool joint diameter (mm) Make-up torque
Type Tool joint Outer Inner (N∙m)
60,3 API NC 26 85,7 44,45 5532
TMK TMK TDS 85,7 44,45 7020
73,0 API NC 31 104,8 50,8 10735
TMK TMK TDS 104,8 50,8 14100
88,9 API NC 38 127,0 61,91 18070
TMK TMK TDS 127,0 61,91 24120
101,6 API NC 40 139,7 61,91 24500
TMK TMK TDS 139,7 61,91 33240
114,3 API NC 46 158,8 76,2 32262
TMK TMK TDS 158,8 76,2 43980
127,0 API NC 50 161,9 88,9 36341
TMK TMK TDS 161,9 88,9 49200
139,7 API 5½ FH 184,2 88,9 58960
TMK TMK TDS 184,2 88,9 89340