System for determining the true depth of an electrical logging t

Details System for determining the true depth of an electrical logging t System for determining the true depth of an electrical logging t

1995-12-12

1996-07-30

Lobo, Ian J.

Communications: electrical

Wellbore telemetering or control

With position or depth recording

367 33, G01V 140, G01V 100

Patent

active

055415873

ABSTRACT:
The present invention is a system for determining the depth of a logging tool attached to a cable extended into a wellbore penetrating an earth formation. In a preferred embodiment, the system includes a circuit for generating a measurement of phase shift in a sinusoidal electrical signal traversing the cable, the phase shift corresponding to a length of the cable. The system also comprises an accelerometer disposed within the tool and electrically connected to a bandpass filter and thence to a double integrator connected to the bandpass filter. The integrator calculates displacement of the tool coaxial with the wellbore. The phase shift measurement is filtered in a low pass filter. The low pass filter and the bandpass filter comprise at least some amount of bandpass overlap. The integrator output is used to generate a scale factor, which is applied to the filtered phase shift signal. The scaled phase shift signal is combined in a computer with a signal generated by a depth encoder. The encoder signal corresponds to the amount of cable extended into the wellbore. The computer calculates the depth of the tool in the wellbore by combining the encoder signal with the scaled phase shift signal and the integrated accelerometer signal.

REFERENCES:
patent: H1289 (1994-02-01), Kyle
patent: 3490149 (1970-01-01), Bowers
patent: 4545242 (1985-10-01), Chan
patent: 4803479 (1989-02-01), Graebner et al.

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