Fibre optic well control system

Details Fibre optic well control system Fibre optic well control system

2006-04-04

2006-04-04

Bagnell, David (Department: 3672)

Wells

Processes

Producing the well

C166S066600

Reexamination Certificate

active

07021388

ABSTRACT:
In a hydrocarbon production well, a control processor32selectively sends light to each of one or more gas lift valves28to cause injection of an injection fluid (such as nitrogen gas) from a pressurised annulus22into a production fluid (hydrocarbon) in production18tubing, and/or to each of one or more inlet valves60, to control the rate of flow of the hydrocarbon (oil). The control processor32receives feedback data from sensors48 54 50 66near to each gas lift28or inlet60valve and otherwise provided in the well bore which measure pressure, temperature or flow rate. The sensors communicate by sensor fibre optic lines42which run in the well bore10. The control processor32sends control signals by operating a laser light source to selectively to send laser light to each valve28 60through valve operating light fibres36which also run through the well bore10. The valves28 60derive their motive power from the laser light using a photovoltaic cell array58which drives an actuator68which can be piezo electric, an electric motor or solenoid.

REFERENCES:
patent: 5892860 (1999-04-01), Maron et al.
patent: 6070608 (2000-06-01), Pringle
patent: 6281489 (2001-08-01), Tubel et al.

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