Circulating valve apparatus and drill stem test method allowing

Details Circulating valve apparatus and drill stem test method allowing Circulating valve apparatus and drill stem test method allowing

1992-12-01

1994-01-04

Bui, Thuy M.

Wells

Processes

Operating valve, closure, or changeable restrictor in a well

E21B 3400

Patent

active

052752410

ABSTRACT:
A test string section for a well comprises a circulating valve (40) including a mandrel (60), a rupture disk (68), and a series of ports (56). The valve is arranged above a packer. A second port (50) is arranged on a pipe section (44) below the packer and a flow tube (52) extends through the internal bore (66). On rupturing the rupture disk, the port (56) is opened whereby mud can be pumped into a rathole via the port to kill the rathole while the seal of the packer against a wall of the wellbore is still intact and the packer remains in a set condition.

REFERENCES:
patent: 4669537 (1987-06-01), Rumbaugh
patent: 4979569 (1990-12-01), Anyan et al.

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