Abstract: Aspects of the disclosure relate to convertible float valve assemblies, and associated components thereof, and methods of using convertible float valve assemblies. A convertible float valve assembly may comprise a sleeve, one or more valves and valve bodies coupled to the sleeve, and a collet coupled to the sleeve. A method may comprise lowering the convertible float valve assembly and a ball downhole, seating the ball on the collet, and releasing the sleeve from the one or more valve bodies.

Abstract: Aspects of the disclosure relate to convertible float valve assemblies, and associated components thereof, and methods of using convertible float valve assemblies. A convertible float valve assembly may comprise a sleeve, one or more valves and valve bodies coupled to the sleeve, and a collet coupled to the sleeve. A method may comprise lowering the convertible float valve assembly and a ball downhole, seating the ball on the collet, and releasing the sleeve from the one or more valve bodies.

Abstract: A float shoe/collar apparatus and method for multi-purpose use in running a tubular string such as a casing string or liner into a wellbore and for optimizing cementing operations. In one presently preferred embodiment, the apparatus permits auto filling of the tubular string as the string is lowered into the wellbore. Circulation can be effected through down jets for washing the wellbore as necessary. After the tubular string is positioned, the down jets can be blocked off and up jets opened to thereby direct cement upwardly to optimize cement placement. Check valves can also be activated to prevent flow from the wellbore into the tubular string. In one embodiment, the apparatus comprises an inner member and tubular member. The inner member is movable upon release of shear pins to cause longitudinal movement relative to the outer member. The movement of the inner member may close a plurality of downward jets and may also open a plurality of upward jets, if desired.

Abstract: An improved float shoe/collar apparatus is provided for use during casing run in or floated in. The apparatus has an inner tubular member and outer tubular member, movable upon release of shear pins to cause longitudinal movement relative to each other. The movement of the inner tubular member closes a plurality of downward jets and opens a plurality of upward jets. The apparatus also is equipped with a set of check valves, held open on run in, and activated to close upon cementing to prevent “u-tubing” of fluid back into the casing.

Abstract: A float shoe/collar apparatus and method is disclosed for multi-purpose use in running a tubular string such as a casing string or liner into a wellbore and for optimizing cementing operations. In one presently preferred embodiment, the present invention permits auto filling of the tubular string as the string is lowered into the wellbore. If desired, circulation can be effected through down jets for washing the wellbore as necessary. After the tubular string is positioned, the down jets can be blocked off and up jets opened to thereby direct cement upwardly to optimize cement placement. Check valves can also be activated in accord with the present invention to prevent flow from the wellbore into the tubular string. In one embodiment, the invention comprises an inner member and tubular member. The inner member is movable upon release of shear pins to cause longitudinal movement relative to the outer member.

Abstract: 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.

Abstract: There is disclosed a through the tubing bridge plug adapted to close off a well bore beneath the lower end of a well tubing and which includes a tubular body connectable to a pipe string for lowering it through the well tubing, an elastomeric packing element surrounding the body, and upper and lower sets of thin, elongate metal strips surrounding the body respectively above and below the packing element. The upper strips are caused to move downwardly and the lower strips to move upwardly to cause their ends to slide over expander surfaces and outwardly against the well bore, on the body above and below the packing element, and the packing element is then inflated into engagement with the well bore intermediate the ends of the strip ends of the metal strips being forced outwardly against the well bore, and the packing element then being inflated to sealably engage the well bore intermediate the ends of the upper and lower metal strips.

Abstract: 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.