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Wellhead assembly

  • US 5,092,401 A
  • Filed: 08/17/1990
  • Issued: 03/03/1992
  • Est. Priority Date: 08/18/1989
  • Status: Expired due to Term
First Claim
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1. A wellhead assembly comprising a normally vertical housing provided with a central bore, with an inwardly projecting supporting shoulder, and with means for securing the housing to a surface casing, two or more casing hangers arranged concentrically in the central bore of the housing, the outermost casing hanger being suspended from the inwardly projecting supporting shoulder of the housing, and annular sealing means preventing fluid communication between an annular space around a casing hanger and a central bore, wherein each casing hanger except the innermost one is provided with an inwardly projecting supporting shoulder from which the adjacent smaller casing hanger is suspended, wherein the uppermost end of a smaller casing hanger extends further in the central bore than the uppermost end of a larger casing hanger, wherein the outer diameter of the uppermost end of a smaller casing hanger is smaller than the inner diameter of the uppermost end of a larger casing hanger, and wherein the annular sealing means are arranged between the upper end of each casing hanger and the wall of the central bore.

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