Depth measurements

Details Depth measurements Depth measurements

1980-02-29

1982-03-30

Phillips, Charles E.

Geometrical instruments

Area integrators

Electrical

C01B 300

Patent

active

043217516

ABSTRACT:
A method is disclosed for measuring at the water's surface the distance between a submerged wellhead and a downhole tubing hanger located in a subsea well which includes lowering an electrical conductor cable through the wellhead until the weighted lower end of the cable engages the tubing hanger. The cable contains two tools, one of which is capable of emitting an electrical signal for transmission to the surface when the cable is picked up and the lower end of the cable disengages from the hanger and the other of which is capable of emitting another electrical signal when it passes a preselected point in the wellhead. The cable is picked up to generate one signal and raised until the other tool passes the preselected point in the wellhead to generate the other signal. The distance the cable has been raised between emission of the two signals is then added to the known distance between the lower end of the cable and the other tool to determine the distance between the wellhead and the tubing hanger.

REFERENCES:
patent: 1695701 (1928-12-01), Steiner et al.
patent: 3902361 (1975-09-01), Watson

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