What are the characteristics of special threads?

 VAM series: NEWVAM, VAMTOP, VAMTOPHC, VAMTOPHT, VAM21, VAMFJL, NEWVAMTOP;  Oil and gas Wells using special thread mainly include high pressure oil and gas Wells, mixed oil and gas Wells, heavy oil thermal recovery Wells, low pressure and low permeability oil and gas Wells, etc.  The steel grades of the unique threaded pipe joint used include N80, L80, C90, 80S, M65, 65S, 95S, T95, 105H, 100H, P110, Q125, V140, etc.  The unique threaded pipe joints used mainly include TM, NK3SB, FOX, VAM, NEWVAM, NSCC, VAMTOP, TPCQ, WSP-1T, BGT and so on.  TPCQ unique buckle production and processing, TPCQ casing collar, TPCQ casing short, TPEX unique buckle tubing, TPEX unique buckle tubing short production and processing.  

Thread features: the connecting thread of VAM threaded pipe joint is 1:16 taper tube partial trapezoidal thread, 25.4mm /5 teeth, tooth height 1.58mm, thread guide Angle 10, bearing Angle 3.  Sealing structure: the sealing structure of the thread is sealed with conical surface metal material, and the torsion shoulder of the special thread front uses -15 chamfering. This kind of torsion shoulder has the effect of auxiliary sealing. 

Outside diameter: 88.9 mm Inside diameter: 75.9 mm Wall thickness: 6.45 mm Non-thickening tubing collar outside diameter is 114.3 mm.  The analysis of the operation characteristics of VAM buckle can obtain the following conclusions: 1, in view of the use of partial trapezoidal buckle thread, resulting in an increase in the load level of the thread, the load to reduce the stress dispersion on each tooth thread more scientific and reasonable, and even higher than the strength of the pipe mouth.  2. In view of the effect of the pretightening force on the pipe opening corresponding to the thread, plastic deformation is formed on the pipe opening corresponding to the thread.  3, in view of the shortcomings of the partial trapezoidal thread, resulting in the sealing characteristics of the thread is reduced, so this kind of thread uses the metal material of the cone to the cone to the metal material sealing.  4, this type of buckle torque shoulder using negative chamfer, has the effect of controlling the buckle torque and also has the effect of auxiliary sealing.