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Well installation in which electrical current is supplied for a source at the wellhead to an electrically responsive device located a substantial distance below the wellhead

  • US 4,852,648 A
  • Filed: 12/04/1987
  • Issued: 08/01/1989
  • Est. Priority Date: 12/04/1987
  • Status: Expired due to Fees
First Claim
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1. A well installation, comprisinga 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, andan electric connector includinga 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, andmeans 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.

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