| 摘要 |
A re-entry cementing float shoe for use with sonar/TV underwater guide systems is a short inner and outer cylindrical housing members in concentric spaced relationship forming an annular space therebetween with a cementing core filling said annular space, said inner housing has its top below the top of the outer housing, the upper inner surface of the cement forming a taperal lining cone, the bottom of the cone ending at the top of the inner housing and the top of the cement cone ending at the inner surface of the outer housing below an inner top portion of the outer housing, said portion having an attachment means for accepting and attaching to a casing pipe. The top inner surface of the inner housing has an inner diameter capable of receiving and holding a cementing pipe string, followed by a first circular shoulder means sloping inwardly and downwardly, a plurality of threads capable of receiving and holding a latch plug are on the inner surface of the inner housing below the first shoulder means, below the threads are a locating means and an anti-rotation and/or orientation means for a sonar/TV locating camera, below said locating means and said anti-rotation means is a second circular shoulder means sloping outwardly and downwardly adapted to sealingly receive a ball valve. Below said second shoulder is a side pocket valve housing with a ball valve, the valve housing extends downwardly and outwardly from the bore of the inner housing to a depth at least equal to the diameter of the ball valve, the diameter of the ball valve being such that it will when in contact with the second shoulder means form a seal.
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