| 摘要 |
Disclosed herein is an apparatus for sealing a cavity between production casing and surface casing. The apparatus includes a seal, which is composed of a plurality of sealing portions. Each of the sealing portions is dimensioned to fit around a portion of the perimeter of the production casing and to seal a portion of the cavity. The sealing portions circumscribe the production casing and sealing the entire cavity when secured in place around the production casing. The apparatus also includes a retainer, which is composed of a plurality of retaining portions. The retaining portions are configured to be clamped together around the surface casing into a secured position and to securely retain the seal around the production casing when in the secured position. Beneficially, this apparatus can be used to retrofit existing, completed wellheads.
|
