Title:
【発明の名称】坑井ケーシング浮揚装置と方法
Document Type and Number:
Japanese Patent JPH05500695
Kind Code:
A
Abstract:
A ported float shoe (5) and a landing collar (16) are attached at a first end of a portion of a casing string (4) and a sliding air trapping insert (20) is attached at the other end. The air trapping insert (20) includes a fluid flow passageway (24) blocked by a plug (22) attached by shear pins to the insert (20) or the air trapping insert is an inflatable insert (55) having a conduit (60) providing a fluid passageway to the first end. The air trapping insert and float shoe form an air cavity (12a or 12b) within the string portion (4). The air cavity provides buoyant forces during running, cementing or other casing operations within a borehole (2), reducing running drag and the related chance of a differentially stuck casing (4). It also allows reciprocation and rotation during cementing and avoids separate removal steps.
Inventors:
MUELLER MARK DAVID (US)
JONES FRANK LEROY (US)
QUINTANA JULIO MANUEL (US)
RUDDY KENNETH EDWARD (US)
MIMS MICHAEL GENE (US)
JONES FRANK LEROY (US)
QUINTANA JULIO MANUEL (US)
RUDDY KENNETH EDWARD (US)
MIMS MICHAEL GENE (US)
Application Number:
JP51252190A
Publication Date:
February 12, 1993
Filing Date:
August 22, 1990
Export Citation:
Assignee:
UNION OIL CO (US)
International Classes:
E21B7/04; E21B31/03; E21B33/14; E21B33/16; E21B43/10; (IPC1-7): E21B33/14; E21B43/10
Attorney, Agent or Firm:
Aoki Akira (4 outside)