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There is disclosed a well installation having an electrically responsive device a substantial distance beneath the wellhead and apparatus for supplying electrical current to the device from a source of alternating or time varying current outside the wellhead, which apparatus includes an electrical c

There is disclosed a well installation having an electrically responsive device a substantial distance beneath the wellhead and apparatus for supplying electrical current to the device from a source of alternating or time varying current outside the wellhead, which apparatus includes an electrical connector comprising a first coil on the outer side and a second coil on the inner side of a non-magnetic portion of a pressure containing wall of the well, whereby the supply of varying current from the source to the first coil forms an inductive coupling between it and the second coil of the connector.

대표청구항 ▼

A well installation, comprising a wellhead including a casing head and a tubing head above the casing head, casing extending downwardly from the casing head into the well bore, tubing suspended from the tubing head and extending downwardly within the casing, valve means including a closure member mo

A well installation, comprising a wellhead including a casing head and a tubing head above the casing head, casing extending downwardly from the casing head into the well bore, tubing suspended from the tubing head and extending downwardly within the casing, valve means including a closure member moveable within the tubing for opening and closing the tubing a substantial distance beneath the wellhead, means urging the closure member toward closed position, a latch which is movable to and maintained in a position holding the closure member in open position, in response to the supply of electrical current thereto, and which is permitted to move to a position releasing the closure member for movement to closed position in response to the loss of said supply, a source of alternating or time varying current outside the wellhead, and an electric connector including a first annular coil mounted about a non-magnetic portion of the wellhead, a second annular coil mounted on the tubing concentrically within and generally opposite the first coil, a first conductor extending from the source of current outside the wellhead to the first coil to supply alternating or time varying current thereto in order to inductively couple the first and second coils, and means for controlling movement of the latch including a second conductor extending from the second coil downwardly between the casing and tubing for supplying electrical current to the latch.