Abstract: A down hole cleaning assembly and method of cleaning a tubular. Generally, the down hole assembly is connected to a work string concentrically located within a casing string. In one embodiment, the down hole assembly comprises a mandrel operatively connected to the work string, with the mandrel having an opening therein. A pad member is received within the opening, with the pad member having a groove formed therein. Also provided is a wire brush member, operatively positioned within the groove of the pad member, for cleaning the internal diameter of the casing string. The pad member and groove may be helical, with the wire brush member positioned within the groove. The down hole assembly further comprises a biasing member, operatively positioned between the mandrel and the pad member, adapted for biasing the wire brush means against the inner diameter of the well bore.

Abstract: A travelling disc valve assembly, comprising a length of tubing lowered down a cased wellbore; a crossover tool secured to the lower end of the length of tubing; a length of wash pipe secured to the lower end of the crossover tool; a disc valve assembly secured to the wash pipe and positioned to a lower circulation position in the well bore; a disc valve secured in a bore of the assembly; a shearing device in the upper portion of the assembly for shearing off the connection between the wash pipe and the disc valve assembly, when the disc valve assembly is in an upper position, providing a way to prevent fluid from flowing into the formation below the disc valve and to prevent production flow to the surface; and a rupturer/disengager to rupture and/or disengage the disc valve at a predetermined time so that the production within the formation is allowed to flow through the assembly bore to the surface.

Abstract: A travelling disc valve assembly, comprising a length of tubing lowered down a cased wellbore; a crossover tool secured to the lower end of the length of tubing; a length of wash pipe secured to the lower end of the crossover tool; a disc valve assembly secured to the wash pipe and positioned to a lower circulation position in the well bore; a disc valve secured in a bore of the assembly; in the upper portion of the assembly for shearing off the connection between the wash pipe and the disc valve assembly, when the disc valve assembly is in an upper position, providing to prevent fluid from flowing into the formation below the disc valve and to prevent production flow to the surface; and a to rupture the disc valve at a predetermined time so that the production within the formation is allowed to flow through the assembly bore to the surface.

Abstract: Disclosed are packers for use with a gravel pack system in an oil or gas well. The packers are of both the releasable and non-releasable, or sump type. The packers are designed so that after they are set or actuated and they seal against the casing wall or the well bore, fluid pressure in either axial direction on the packer seal will increase the energizing force on the seals. This self-energizing feature is accomplished with selectively disposed and sized annular seals on telescoping members.

Abstract: The gravel pack system includes a crossover assembly disposed within a screen assembly which has been adapted for disposal adjacent a producing formation within a well. The screen assembly includes a packet for sealing the annulus between the screen assembly and a well casing and a production screen disposed below the packer. The crossover assembly includes a wash pipe and a crossover tool adapted for suspension within the well on a pipe string for disposal within the screen assembly. Upon the disposal of the crossover assembly within the screen assembly, the assemblies together form an upper crossover valve, a lower crossover valve, a circulation valve, and a screen valve. These valves are selectively opened and closed for the various gravel pack operations by raising the crossover assembly within the screen assembly.

Abstract: Sand placement apparatus includes a well screen assembly and a sand placement tool. The sand placement tool comprises a tubing extension or stinger and a slurry conduit which includes a barrel concentrically disposed around the stinger and a tail pipe extending down therefrom with a valve controlled seal sub at the lower end of the tail pipe. The well screen assembly comprises a production liner including a valve controlled seal socket, a lower or main well screen, a short length of pipe, an upper or tell-tale well screen, and the tubular mandrel of a hook wall packer. By means of this packer the liner is suspended within a well casing. The liner is positioned with its screens inside a perforated section of a well casing. The tool is positioned inside the liner by means of a sleeve anchored to the packer mandrel and adjustably positioned relative to the barrel to deliver sand-water slurry to the liner-casing annulus and build up the sand from the top of the annulus and then downwardly.

Abstract: A sand or gravel placement or packing apparatus for positioning particulates outside well screen includes pipe to conduct slurry to below the screen and receive clear liquid returning from outside the screen as the particulates accumulate upwardly, the apparatus including valving to provide for initial injection of clear fluid, for circulation slurry, for squeezing the slurry, for flusing the tubing and parts of the tool by reverse circulation, and for closing the slurry injection part below the screen and the lower end of the slurry pipe when the latter is withdrawn.