Packer bypass

Details Packer bypass Packer bypass

E - Fixed Constructions

21

B

166/6.1

E21B 33/124 (2006.01) E21B 34/12 (2006.01) E21B 34/14 (2006.01)

Patent

CA 1284099

Abstract A packer bypass for use between a pump and packer in a testing string for venting said pump and packer to a well annulus after completion of a testing operation. The packer bypass comprises a case with an inner flow tube disposed therein such that an annular passageway is defined therebe- tween. A piston having a lower portion is reciprocably disposed in the annular passageway. A plurality of latching fingers are pivotally mounted to the lower end of the piston and biased towards a latching position. A bypassing mandrel is reciprocably disposed in the annular passageway below the piston and has an open position for bypassing pump pressure thereabove and packer pressure therebelow to the well annu- lus and also has a closed position in which bypassing is prevented. The mandrel may be raised from the closed posi- tion to the open position by lowering the piston and engaging the latching fingers with a flange on the mandrel. When the mandrel is moved to the open position, the latching fingers are automatically released. The mandrel may be pumped back to the closed position for another test. Hydraulic pressure across the mandrel prevents overpull, and pressure balancing on the piston prevents undesired downward force on the packer.

553462

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