| 摘要 |
Circulation flow apertures in a wellbore pipe, tubing, casing or casing line r screen may be selectively closed by an internal pipe sleeve that is formed of a thi n, malleable material. One axial end of the sleeve is flared and secured to the inner bor e surface of the pipe as by welding or by clamping between the ends of axially adjacent pipe joints joined by a threaded coupling. The remaining length of the sleeve extends along the pipe and over any pipe apertures to form an annular space between the outer cylinder surfa ce of the sleeve and the inner bore surface of the pipe. A perimeter seal element such as an O- ring is placed around the sleeve outer perimeter beyond the apertures in a direction opposi te from the sleeve flare. The flow aperture, in the pipe is closed by a swaging tool tha t expands the sleeve against the pipe bore wall sufficiently to close the annulus and compress the O-ring seal against the pipe borewall.
|
