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| Number | Title | Issue Date |
| 7984763 | Full bore lined wellbores Embodiments of the invention relate to an assembly for forming a cased well. The assembly may include an undercut drillable cementing shoe with a casing string connection at a first end. The shoe includes external tubing that forms a second end of the shoe and has a... | 07/26/2011 |
| 7357181 | Apparatus for autofill deactivation of float equipment and method of reverse cementing A method for cementing a casing in a wellbore, the method having the following steps: attaching a valve to a casing; locking the valve in an open configuration; running the casing and the valve into the wellbore; reverse circulating a cement composition down an annu... | 04/15/2008 |
| 7337850 | System and method for controlling actuation of tools in a wellbore A technique is provided to control operation of well tools deployed in a wellbore. The technique utilizes a completion with at least one well tool actuated by fluid input. An electronic trigger system is associated with each well tool and is designed to respond to a... | 03/04/2008 |
| 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 |
| 7168492 | Wellbore annulus flushing valve The invention relates to downhole wellbore apparatus and particularly, but not exclusively, to apparatus for use in wellbore cleaning operations. A downhole tool (2) comprises a body (4) having a bore extending longitudinally therethrough, wherein the ... | 01/30/2007 |
| 7163058 | Hydraulic jar device An arrangement by a hydraulic jar device, especially for use in underground wells, where the jar device is installed in a pipe string led down into the well, and designed so that e.g. a stuck object in the well may be loosened or broken up by upward or downward perc... | 01/16/2007 |
| 7108068 | Floating plate back pressure valve assembly A back pressure valve assembly for use in a well casing string. The valve assembly comprises a housing with a stationary and a floating plate therein. The floating plate is moveable between an open position spaced from the stationary plate and a closed position enga... | 09/19/2006 |
| 7108071 | Automatic tubing filler Methods and apparatus for filling a tubing string as it is lowered into a subterranean hydrocarbon well. In one embodiment, an apparatus to fill a tubular with fluid in a wellbore comprises a housing defining a central bore. An aperture formed in the housing provide... | 09/19/2006 |
| 6904975 | Interventionless bi-directional barrier An interventionless bi-directional barrier device of a downhole tool for use in a wellbore and a method of utilizing the barrier device to control the flow of production fluids in the wellbore are described herein. The barrier device includes a flapper mechanism hav... | 06/14/2005 |
| 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 |
| 6758281 | Methods and apparatus for creating a downhole buoyant casing chamber Methods and apparatus for creating a downhole buoyant casing chamber. The buoyant casing chamber may be created after the casing has been at least partially run into the wellbore. Some embodiments also allow circulation of fluid as the casing is being run after the ... | 07/06/2004 |
| 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 |
| 6712145 | Float collar The present invention relates to a float collar apparatus for regulating the passage of fluid through a drilling/production liner or sub-sea casing. Apparatus of the present invention is fabricated using plastic flapper valves and valve-actuating sleeve components i... | 03/30/2004 |
| 6684957 | Float collar The present invention relates to a float collar apparatus for regulating the passage of fluid through a casing liner or sub-sea casing. Apparatus of the present invention is fabricated using plastic flapper valves and sleeve components in contrast to prio... | 02/03/2004 |
| 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 |
| 6666273 | Valve assembly for use in a wellbore The present invention generally relates to a plunger-type valve for use in a wellbore. The plunger-type valve is arranged to selectively allow fluid flow to enter and exit the valve in both directions. Subsequently, the plunger-type valve can be deactivat... | 12/23/2003 |
| 6651748 | Methods and apparatus for creating a downhole buoyant casing chamber Methods and apparatus for creating a downhole buoyant casing chamber. The buoyant casing chamber may be created after the casing has been at least partially run into the wellbore. Some embodiments also allow circulation of fluid as the casing is being run... | 11/25/2003 |
| 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 |
| 6547007 | PDF valve A differential float and cementing valve assembly used to position and cement casing in a well bore. A leaf spring and other components of the assembly are preferably constructed of composite materials and/or plastics that can be drilled up with polycryst... | 04/15/2003 |
| 6520256 | Method and apparatus for cementing an air drilled well A downhole cementing system employing a cement choke within the casing to reduce the downward velocity of cement through the casing and thereby inhibit formation fracturing caused by vibration of the casing. The cement choke includes a tubular body defini... | 02/18/2003 |
| 6513590 | System for running tubular members The present invention relates to a wiper plug and internal drop ball mechanism that may be used in conjunction with a downhole surge reduction tool to run, hang, and cement casing liners in a wellbore. The apparatus of the present invention comprises a wi... | 02/04/2003 |
| 6505685 | Methods and apparatus for creating a downhole buoyant casing chamber Methods and apparatus for creating a downhole buoyant casing chamber. The buoyant casing chamber may be created after the casing has been at least partially run into the wellbore. Some embodiments also allow circulation of fluid as the casing is being run... | 01/14/2003 |
| 6497291 | Float valve assembly and method An improved float valve according to the present invention includes a packer 10 for positioning within a joint of the casing C while at the surface of the well, the packer including a float valve receptacle therein for at least partially receiving a float... | 12/24/2002 |
| 6491103 | System for running tubular members The present invention relates to a wiper plug and internal drop ball mechanism that may be used in conjunction with a downhole surge reduction tool to run, hang, and cement casing liners in a wellbore. The apparatus of the present invention comprises a wi... | 12/10/2002 |
| 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 |
| 6056053 | Cementing systems for wellbores A new wellbore cementing system has been developed which includes, in certain embodiments, a plug container with a flow diverter for diverting a portion of flowing fluid away from plugs in the plug container; a plug set system with internal sleeves or dar... | 05/02/2000 |
| 5957197 | Downhole cut-off valve used for cementing A downhole cut-off valve used for cementing a casing string, comprising: an outer hollow body, having a top end connected at the lower end of the casing string, an inner hole, an inner surface and a projecting shoulder forming on the inner surface and ext... | 09/28/1999 |
| 5850881 | Drill pipe float valve and method of manufacture A float valve 10 includes a valve body 12 for sealing engagement with a float sub 20 having threads for threaded engagement with an oilfield tubular. A valve element 40 includes a stem 50, 70 and a valve cone 52, 80 secured thereto. The valve cone is conf... | 12/22/1998 |
| 5823265 | Well completion system with well control valve A system for selective production from, and stimulation of, subterranean production zones while improving productivity and enhancing control of the well. Portions of a production tubing string and an internal stimulation/shifter string are assembled and r... | 10/20/1998 |
| 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 |
| 5690177 | Fill valve A fill valve includes a tubular housing which accommodates a valve member which is biased toward a closed position by a light spring. The valve member includes a head and a tubular portion which is provided with two large windows. When the fill valve is o... | 11/25/1997 |
| 5687792 | Drill pipe float valve and method of manufacture A float valve 10 includes a valve body 12 for sealing engagement with a float sub 20 having threads for threaded engagement with an oil field tubular. A valve element 40 includes a stem 50, 70 and a valve cone 52, 80 secured thereto. The valve cone is con... | 11/18/1997 |
| 5680902 | Wellbore valve A fill valve includes a tubular housing which accommodates a valve member which is biased toward a closed position by a light spring. The valve member includes a head and a tubular portion which is provided with two large windows. When the fill valve is o... | 10/28/1997 |
| 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 |
| 5511618 | Fill valve A fill valve includes a tubular housing which accommodates a valve member which is biased toward a closed position by a light spring. The valve member includes a head and a tubular portion which is provided with two large windows. When the fill valve is o... | 04/30/1996 |
| 5472053 | Leakproof floating apparatus and method for fabricating said apparatus A floating apparatus for use in a casing string. The apparatus includes an outer sleeve having a check valve centrally positioned therein. A body portion, which may be comprised of high compressive strength cement, is affixed to the check valve and the ho... | 12/05/1995 |
| 5450903 | Fill valve A fill valve includes a tubular housing which accommodates a valve member which is biased toward a closed position by a light spring. The valve member includes a head and a tubular portion which is provided with two large windows. When the fill valve is o... | 09/19/1995 |
| 5379835 | Casing cementing equipment Insert type floating equipment valves for use in the cementing of casing in oil and gas wells and the like which may be retained in the casing therein through the use of slips or set screws or anchors and uses either cup type or compression type sealing m... | 01/10/1995 |
| 5327960 | Gravel pack installations for wells A gravel pack screen assembly includes a bit or sub having a flow passage which may accept a wash pipe. The wash pipe may be inserted past a flapper-type closure member which moves to a closed position upon withdrawal of the wash pipe after completion of ... | 07/12/1994 |
