公开(公告)号：US5660234A

公开(公告)日：1997-08-26

申请号：US593157

申请日：1996-02-01

Applicant: Paul A. Hebert ,  Lionel J. Milberger ,  Joseph W. Pallini, Jr.

Inventor： Paul A. Hebert ,  Lionel J. Milberger ,  Joseph W. Pallini, Jr.

IPC: E21B7/12 ,  E21B34/04 ,  E21B33/14 ,  E21B43/01 ,  E21B47/06

CPC classification number: E21B7/12 ,  E21B34/04

Abstract: A subsea wellhead system is used in areas which have shallow water producing sands. A first string of casing extends from the sea floor through a section of conductor pipe and below the conductor pipe to a point above the water sand. An external wellhead housing having flow ports is supported at the upper end of the conductor pipe. A valve sleeve is located on the exterior of the external wellhead housing. The valve sleeve is movable to a closed position, closing the flow ports. A second string of casing is installed to a point below the water producing formation. An internal wellhead housing is secured to the upper end of the second string of casing, which lands within the external wellhead housing. During cementing of the second string of casing the flow ports are open. After cementing, the valve sleeve is moved to the closed position.

Abstract translation: 在具有浅水产沙的地区使用海底井口系统。 第一套套管从海底延伸穿过一段导体管，并在导管下方延伸到水沙上方。 具有流动端口的外部井口壳体被支撑在导体管的上端。 阀套位于外部井口外壳的外部。 阀套可移动到关闭位置，关闭流动端口。 第二套套管安装在生产水层下方的一个点上。 一个内部井口外壳固定在第二个外壳套管的上端，该第二套管套住在外部井口外壳内。 在第二套套管固井期间，流动端口打开。 固井后，阀套被移动到关闭位置。