By-Pass Valve

During drilling operation, when well kick is taken place and bit bore is blocked. The by-pass valve can be opened to go fluid circulation and well killing .Before drilling in flow gas formation, the by–pass valve shall be located near or on the bit.

Parameter of By-Pass Valve

During drilling operation, when well kick is taken place and bit bore is blocked. The by-pass valve can be opened to go fluid circulation and well killing .Before drilling in flow gas formation, the by–pass valve shall be located near or on the bit.
When take place well kick and pump pressure is too high or blocked, the following steps can be taken to open the by-pass valve :

  • Discharge Kelly and drop in a steel ball (or a Nylon ball) which is carried by tool;
  • Connect with Kelly;
  • Put ball into retainer by pump circulation;
  • When fluid is closed, the shear pin can be sheared off with adding 0.5~1.5Mpa pump pressure than original pump pressure;
  • After pin is sheared, the seal sleeve move down to open the discharge hole and pump pressure come to drop down , then normal circulation and well killing operation can be started.

When ordering please specify:

  • O.D. of body;
  • Connection;
  • Pump pressure to shear off pin if other than standard.
Model O.D.(mm) Seal sleeve

(mm)

Top Connection

(BOX)

Bottom

Connection

Pump Pressure of

Shea –off shear pin

O.D. of Steel ball

(mm)

PTF105 105 32 NC31 NC31(PIN) 3~10Mpa 35
PTF121A 121 38 NC38 NC38(PIN) 3~10Mpa 45
PTF127 127 38 NC38 NC38(PIN) 3~10Mpa 45
PTF127C 127 38 NC38 3 1/2REG (BOX) 3~10Mpa 45
PTF159 159 49 NC46 NC46(PIN) 3~10Mpa 54
PTF159B 159 49 NC46 4 1/2REG(BOX) 3~10Mpa 54
PTF168 168 50.8 NC50 NC50(PIN) 3~10Mpa 54
PTF203 203 62 6 5/8REG 6 5/8 REG(BOX) 3~10Mpa 65

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