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| Number | Title | Issue Date |
| 7681637 | Self-orienting guide shoe A guide shoe that utilizes an eccentric nose attached to a cylindrical body that has spiraled, ridged blades extending outward from the body. An orientation system is attached between the body and a hollow shaft. The orientation system is designed to allow free rota... | 03/23/2010 |
| 7493950 | Device for a long well tool Device for a tool string (2) for insertion in a well, the tool string (2) being provided with a brake nose (1). ... | 02/24/2009 |
| 7428927 | Cement float and method for drilling and casing a wellbore with a pump down cement float A cement float collar is made for pumping downhole and into engagement with a groove formed in the casing, called the profile nipple. As such, no restriction is needed in the casing for accepting or latching the float collar and the portion of casing including the g... | 09/30/2008 |
| 7395882 | Casing and liner drilling bits A casing bit, which may comprise a composite structure, for drilling a casing section into a subterranean formation, and which may include a portion configured to be drilled therethrough, is disclosed. Cutting elements and methods of use are disclosed. Adhesive, sol... | 07/08/2008 |
| 7290612 | Apparatus and method for reverse circulation cementing a casing in an open-hole wellbore The present invention is directed to an apparatus and method for reverse circulation cementing a casing in an open-hole wellbore. The apparatus includes a surface pack-off device, which has a housing defined by an upper section and lower section. A load bearing plat... | 11/06/2007 |
| 7287584 | Anchoring device for a wellbore tool An anchoring device for tool is disclosed that can be positioned downhole and used in casing. The anchoring device can have an architecture that supports installation by running downhole and into engagement with a recess formed in the casing. The anchoring device ca... | 10/30/2007 |
| 7270181 | Downhole surge pressure reduction and filtering apparatus The present invention provides a downhole cementing apparatus run into a borehole on a tubular. The apparatus is constructed on the pipe in such a way that pressure surge during run-in is reduced by allowing fluid to enter the pipe and utilize the fluid pathway of t... | 09/18/2007 |
| 7240731 | Shoe for expandable liner system and method An apparatus to protect the mounting area of casing when subsequently attaching a tubular is disclosed. A sleeve that defines a sealed cavity having a loose incompressible material inside covers the mounting location on the casing. The cementing of the casing takes ... | 07/10/2007 |
| 7234522 | Apparatus and method for drilling a wellbore with casing and cementing the casing in the wellbore A float system for use in cementing a casing in a wellbore. The wellbore is drilled with a drill bit attached to the casing. The drill bit is removed after the wellbore is drilled. The float system is lowered into the casing after the drill bit is removed. The float... | 06/26/2007 |
| 7219745 | Completion apparatus and methods for use in wellbores An apparatus and methods for preventing the accumulation of unwanted materials in an enlarged inner diameter portion of a casing or housing. In one aspect of the invention, a sleeve is disposed in the housing to isolate an annular area defined by the outer surface s... | 05/22/2007 |
| 7216727 | Drilling bit for drilling while running casing A drill bit for drilling casing in a well bore. The drill bit is constructed from a combination of relatively soft and relatively hard materials. The proportions of the materials are selected such that the drill bit provides suitable cutting and boring of the well b... | 05/15/2007 |
| 7204304 | Removable surface pack-off device for reverse cementing applications A removable surface pack-off device adapted for use in reverse cementing applications is provided. The device includes a housing adapted to be mounted between the ends of an inner casing and an outer casing at or near the surface of a well and at least one fluid pas... | 04/17/2007 |
| 7100713 | Expandable apparatus for drift and reaming borehole An expandable reamer shoe is provided for use with expandable casing in a borehole. The reamer shoe has a number of reaming members in the form of blades which remain closed against the body of the shoe when inserted through casing, and can then be expanded to under... | 09/05/2006 |
| 7080687 | Anti-rotation method and apparatus for limiting rotation of cementing plugs An apparatus for preventing or limiting the rotation of cementing plugs in a casing string during drillout. The apparatus includes an outer housing with a sleeve disposed therein. The sleeve has an inner surface configured to engage cementing plugs received therein ... | 07/25/2006 |
| 7066253 | Casing shoe A shoe for guiding a string within a well-bore comprises an annular body of relatively hard material and a nose portion of relatively soft material which are interlocked so that when the nose portion is drilled through, any remaining parts are held against the annul... | 06/27/2006 |
| 7036577 | Underground water pumping device A groundwater pumping apparatus includes an outer tube, an inner tube, a shield member, a vacuum unit and a pump unit. The outer tube is buried in ground, and has a water-passing portion at its lower part. The inner tube has a substantially same length as the outer ... | 05/02/2006 |
| 6820695 | Snap-lock seal for seal valve assembly A float apparatus for use in a casing string. The float apparatus includes an outer case having a check valve positioned therein. A body portion which may be comprised of high compressive strength cement affixes the check valve to the outer case. The check valve inc... | 11/23/2004 |
| 6810958 | Circulating cementing collar and method An apparatus and method for cementing a casing string in a wellbore. A self-filling tubular cementing collar connected to the lower end of a casing string is provided with one-way flow valving that allows well fluid to enter and self-fill the casing string as it is ... | 11/02/2004 |
| 6802374 | Reverse cementing float shoe A float shoe comprising an upper section having a casing connection at an upper end thereof, and a lower section slidably coupled to the upper section, the lower section comprising a closed lower end and having at least one port disposed therein. ... | 10/12/2004 |
| 6772841 | Expandable float shoe and associated methods An expandable float shoe and associated methods are provided. In a described embodiment, an expandable float shoe is attached to a leg of an expandable wellbore junction. The float shoe and leg are radially compressed, such as by folding along their axial lengths. T... | 08/10/2004 |
| 6725935 | PDF valve A differential float and cementing valve assembly used to position and cement casing in a wellbore. A leaf spring and other components of the assembly are preferably constructed of composite materials and/or plastics that can be drilled up with polycrystalline diamo... | 04/27/2004 |
| 6679336 | Multi-purpose float equipment and method 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 ... | 01/20/2004 |
| 6659173 | Downhole tool A tubing shoe (30) comprising: a body (32) for mounting on the end of a tubing string; and reaming members (36) extending longitudinally and helically around the body, the reaming members providing substantially complete circumferential coverage of the bo... | 12/09/2003 |
| 6571869 | Downhole surge pressure reduction and filtering apparatus The present invention provides a downhole cementing apparatus run into a borehole on a tubular. The apparatus is constructed on the pipe in such a way that pressure surge during run-in is reduced by allowing fluid to enter the pipe and utilize the fluid p... | 06/03/2003 |
| 6457517 | Composite landing collar for cementing operation A composite landing collar is disclosed which is preferably adhesive bonded to the liner string using a high temperature epoxy. The spacing during bonding is maintained within dimensional limits using spacers. The body features a bi-directional material, ... | 10/01/2002 |
| 6443247 | Casing drilling shoe A casing drilling shoe adapted for attachment to a casing string and comprising an outer drilling section constructed of a relatively hard material such as steel and an inner section constructed of a readily drillable material such as aluminum. The drilli... | 09/03/2002 |
| 6435281 | Invisible liner An impervious metallic liner for the isolation of the well bore from the formations of an oil or gas well below a casing string; the liner being flattened to run through the casing string, but is inflated to occupy the space directly below the casing stri... | 08/20/2002 |
| 6401820 | Downhole tool A tubing shoe (30) comprising: a body (32) for mounting on the end of a tubing string; and reaming members (36) extending longitudinally and helically around the body, the reaming members providing substantially complete circumferential coverage of the bo... | 06/11/2002 |
| 6401824 | Well completion convertible float shoe/collar 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. T... | 06/11/2002 |
| 6302205 | Method for locating a drill bit when drilling out cementing equipment from a wellbore A method for locating a drill bit when drilling out cementing equipment from a casing of a wellbore. A first step involves placing in the casing of the wellbore at the time of placing cementing equipment, at least one coloured marker member. A second step... | 10/16/2001 |
| 6062326 | Casing shoe with cutting means A casing shoe (30) for use in guiding a casing into a wellbore comprises a generally cylindrical body (2) having a box portion (34) at its rearward end for connection to a casing string and having a generally rounded nose portion (36) at its forward end. ... | 05/16/2000 |
| 5964297 | Drilling method and casing shoe During procedures in which earth layers are drilled and casing tubes are simultaneously inserted into the drilled regions, it is desirable to use casing tubes formed from a plastic material. This is accomplished by utilizing a casing shoe which is formed ... | 10/12/1999 |
| 5909771 | Wellbore valve A new fill valve for use in cementing operations in a wellbore extending down into the earth has been invented, the fill valve having a tubular housing having a valve seat, a valve member slidably mounted in said tubular housing, a spring for biasing said... | 06/08/1999 |
| 5697442 | Apparatus and methods for use in cementing a casing string within a well bore The present invention provides an apparatus in the form of a float shoe or collar for use in cementing a casing string within a well bore. The shoe or collar has blades extending therefrom for centering the shoe or collar, as well as the lower end of the ... | 12/16/1997 |
| 5669443 | Shoe for used in the construction of oil and gas wells A shoe for attachment to a length of casing for use in a wellbore comprises a body portion attachable to casing, and a nose portion rotatably mounted on the body portion. A casing string with a plurality of casing sections and such a shoe.... | 09/23/1997 |
| 5647434 | Floating apparatus for well casing Floating apparatus for well casing including a check valve disposed in a sleeve, wherein the sleeve is receivable within an outer case. In the case of a float collar, the outer case comprises coupled upper and lower casing string sections; while in the ca... | 07/15/1997 |
| 5494107 | Reverse cementing system and method A cementing system where cement slurry is pumped down the annulus between the casing string and the well bore wall and then allowed to harden therein. A cement shoo on the lower end of the casing string prevents upward flow of fluids as the casing string ... | 02/27/1996 |
| 5265680 | Method for installing instruments in wells A method for installing an instrument at or near the bottom of a cased well. A cavity is formed within the body of a float shoe or float collar positioned at the bottom or near the bottom of a casing string as it is assembled for installation in a well. A... | 11/30/1993 |
| 5246069 | Self-aligning well apparatuses and anti-rotation device for well apparatuses Well apparatuses with device for preventing their relative rotation with respect to adjacent well apparatuses and anti-rotation devices for well apparatuses, including, but not limited to, plugs, float shoes, float collars, jars, and clutch devices for pa... | 09/21/1993 |
| 5234052 | Cementing apparatus 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 en... | 08/10/1993 |
