| 摘要 |
Apparatus ( 10 ) for facilitating coupling and cementing of downhole tubulars ( 12, 28 ) comprises a tubing section ( 12, 10 ) for use in lining a bore. The tubing section has upper and lower ends and defines a tubing wall having cement outlets ( 20 ) spaced from the lower end of the tubing. The lower end of the tubing is selectively closed, and swab cups ( 22 ) are provided externally of the lower end of the tubing below the cement outlets ( 20 ) for restricting passage of cement.
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