SYSTEM AND METHOD FOR SIGNALLING DOWNHOLE CONDITIONS TO SURFACE

Title:

SYSTEM AND METHOD FOR SIGNALLING DOWNHOLE CONDITIONS TO SURFACE

Document Type and Number:

WIPO Patent Application WO2002038914

Kind Code:

A3

Abstract:

A method and apparatus is described for signalling the surface operator about downhole conditions. Sensors (4716) located downhole collect data while drilling and the data is processed to determine bit failure, for example. When the sensor data indicates a failure, the pressure of drilling mud is varied using a valve (4710) on the downhole unit (4706), and this pressure variance is indicated by a pressure gauge visible to the operator. This pressure change tells the operator a failure has been indicated.

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Inventors:

SCHULTZ ROGER L (US)
DE JESUS ORLANDO (US)
OSBORNE ANDREW J JR (US)

Application Number:

PCT/US2001/047281

Publication Date:

November 07, 2002

Filing Date:

November 07, 2001

Export Citation:

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Assignee:

HALLIBURTON ENERGY SERV INC (US)
SCHULTZ ROGER L (US)
DE JESUS ORLANDO (US)
OSBORNE ANDREW J JR (US)

International Classes:

E21B12/02; E21B28/00; E21B41/00; E21B44/00; E21B47/18; (IPC1-7): E21B12/02; E21B47/00

Foreign References:

US3853184A	1974-12-10
US4688647A	1987-08-25
US5138875A	1992-08-18
US5813480A	1998-09-29
US4655300A	1987-04-07
US4911252A	1990-03-27
US4821563A	1989-04-18
US4627276A	1986-12-09

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