The PBL Bypass System has provided a simple and reliable solution to various drilling problems, including lost circulation. The new Auto Lock Bypass System was developed at the request of the operators to allow for safer and more timely tripping. By locking the tool in the open position, the Drill String can easily drain and fill during tripping operations. This new Bypass System allows operators the ability to open and close the tool down hole up to 5 times to assist in dealing with hole conditions. This new system is safe, reliable and effective.

THE UNIQUE BALL LOCK SYSTEM WORKS AS FOLLOWS:

1. Drop the Activation Ball to open the Ports.
2. Drop 2 Chrome Steel Deactivation Balls to close the Ports and reset the tool in order to resume drilling.

To Lock The Port Open:

1. With the Activation Ball dropped and the tool open, drop the Locking Ball. When the Locking Ball reaches the tool it will move through the Port in the Sleeve and lodge in the Nozzle in the Main Body. When pressure/flow is reduced, the Sleeve will start to close, wedging the Ball against the Nozzle, holding the Sleeve open. The top of the Activation Ball is level with the Ports, so that no debris can be accumulated above it; all debris is simply flushed out of the port. (see Figure 1)

TO UNLOCK THE PORT OPEN:

1. With the tool in the locked open position (Activation Ball in the Seat, and the Locking Ball in the Port Nozzle), drop two Chrome Steel Deactivation Balls. The operator then pressures up past the shear pressure rated for the tool (stamped on the OXD). The following series of events occurs, releasing the tool to the closed position.

Figure 1.