Davis-lynch, Inc.

Frank Cole

Malcolm G Coone

Jeffry C Ehlinger

A method and apparatus for cementing a casing string utilizes a port collar which may be hydraulically opened and mechanically closed, and permits the passage of downhole tools through the port collar, without opening the port collar.

Apparatus for cementing a casing string

There is disclosed an assembly of parts for use in cementing a casing string in a well bore comprising a float collar connectible as part of the string, a cement plug lowerable onto the collar, and a wiper plug lowerable onto the cement plug, the lower end of the cement plug having threads for limited make-up with threads on the upper end of the collar and the lower end of the wiper plug having threads for limited make-up with the cement plug, so as to limit rotation between them.

Cementing apparatus

Apparatus is disclosed for use in placing cement within the annulus between a casing string and a well bore in which the casing string is suspended, such apparatus including a stage collar connectible as part of the casing string and having a packing element mounted thereon and adapted to be inflated into engagement with the well bore, one or more side ports through which cement may be circulated into the annulus above the packer, tubular members or sleeves for opening and closing the ports following inflation of the packing element.

Cementing apparatus and method

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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Sugar Land, TX, United States of America

Frank Cole