Damage tolerant casing hanger seal,申请号US201414454012-传众专利搜索

Damage tolerant casing hanger seal

申请公布号：US9341039(B2)

申请号：US201414454012

申请日期：2014.08.07

申请公布日期：2016.05.17

申请人：

Vetco GrayInc.

发明人：Galle Gary L.;Hunter Rick C.

分类号：E21B33/03;E21B33/04;F16J15/20;F16J15/26;F16J15/16;F16J15/18

主分类号：E21B33/03

代理机构：

Bracewell LLP

代理人：Bracewell LLP

地址：Houston TX US

摘要：A seal assembly is inserted within an annulus between inner and outer coaxially disposed annular members having a common axis. The seal assembly includes a seal stack having a compliant element sandwiched between two anti-extrusion elements that contain the flow of the compliant element. The seal assembly also includes a sealing ring and a locking ring coupled to the sealing ring. The seal assembly also includes an energizing ring configured to be moved axially in a first direction by a ring tool to apply an axial force to the locking ring, which in turn acts on the sealing ring to radially deform the sealing ring into sealing engagement with the annular members. Continued axial movement of the locking ring in the first direction radially deforms the locking ring into locking engagement with the annular members.

主权项：1. A wellhead assembly comprising: a wellhead housing having a bore with an axis; a casing hanger landed in the bore, defining an annular seal pocket between the casing hanger and the wellhead housing; a seal assembly that seals within the seal pocket, comprising: an upper seal having inner and outer seal surfaces that seal between the casing hanger and the wellhead housing, the upper seal having a depending extension member below the inner and outer seal surfaces; a lower seal, comprising: a lower seal retaining ring; a cylindrical member extending from the extension member to the lower seal retaining ring; an outer seal stack between the lower seal retaining ring and the extension member and having an inner diameter in engagement with the cylindrical member; the outer seal stack having compliant sealing elements that move to a set position, sealing between a surface of the wellhead housing and the cylindrical member; an inner seal stack coaxial with the outer seal stack between the lower seal retaining ring and the extension member, the inner seal stack having an outer diameter smaller than the inner diameter of the outer seal stack and in engagement with the cylindrical member; the inner seal stack having compliant sealing elements that move to a set position, sealing between a surface of the casing hanger and the cylindrical member; and the outer seal stack and the inner seal stack being movable to the set position in response to an axial force applied by downward movement of the upper seal member relative to the lower seal member along a load path through the extension member, the outer and inner seal stacks and the lower seal retaining ring, the load path bypassing the cylindrical member.