By-Pass Valve
Introduction:
During drilling operation, when a well kick takes place and bit bore is blocked, the by-pass valve can be opened to allow fluid circulation and well killing. Before drilling in a gas formation, the By-Pass valve shall be located near or on the bit.
When well kick take place 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 by adding 0.5~1.5MPa higher 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.
Available model:
PTF105 PTF121A PTF127 PTF127C PTF159 PTF159B PTF168 PTF203
When ordering please specify:
●O.D. of body;
●Connection;
●Pump pressure required to shear off pin (per customer requirement)
Specifications - By-Pass Valve
1 By-pass valve PTF105 105 32 NC31 NC31 (PIN) 3-10 MPa 35
2 By-pass valve PTF121A 121 38 NC38 NC38 (PIN) 3-10 MPa 45
3 By-pass valve PTF127 127 38 NC38 NC38 (PIN) 3-10 MPa 45
4 By-pass valve PTF127C 127 38 NC38 3 1/2 REG (BOx) 3-10 MPa 45
5 By-pass valve PTF159 159 49 NC46 NC46 (PIN) 3-10 MPa 54
6 By-pass valve PTF159B 159 49 NC46 4 1/2 REG (BOx) 3-10 MPa 54
7 By-pass valve PTF168 168 50.8 NC50 NC50 (PIN) 3-10 MPa 57
8 By-pass valve PTF203 203 62 6 5/8 REG 6 5/8 REG (PIN) 3-10 MPa 65
