The check valve permits the tubing string 36 to fill while running into the well 10, as well as permitting reverse circulation through the wash tool 48. Additionally, the ball 222 is self centered to facilitate easy seating thereof when the jetting tool 46 is in a horizontal position such as...
wedge-type annular cut with trapezoidal cross-section, The cut is filled with solder of a magnetic material (27); the external and internal surfaces of the body (24) are then machined, the magnetic material acts as a gap impeding the circulation of magnetic current through the valve body (...
8. After the circulation, shut off the bottom valve, and open the bottom stop pin and open the middle valve to inject cement and observe the plug indicator is up or not. 9.After the injection of cement, shut off middle valve and open the top s...