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...During the Civil War, the Confederacy established its own Patent Office which issued 266 patents, a third of which concerned implements of war.
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| Number | Title | Issue Date |
| 8162047 | Reverse-circulation cementing of surface casing An apparatus for reverse circulation cementing of surface casing in subterranean formations and associated methods are provided. One example of a method may involve a method of reverse circulation cementing a surface casing in a well bore with a conductor casing pos... | 04/24/2012 |
| 8082982 | Methods and devices for forming a wellbore with casing A method for cementing a tubular in a wellbore in a subterranean formation, according to one or more aspects of the present disclosure, comprises connecting a circulating tool to a slip and a top drive; gripping a first tubular with the slip above the surface of the... | 12/27/2011 |
| 7987905 | One trip cemented expandable monobore liner system and method An apparatus to protect the mounting area of casing and a locating profile and optionally a sliding sleeve valve and a flow path is provided from the outside of the valve to the annulus when subsequent attachment of an expanded liner is intended and the expanded lin... | 08/02/2011 |
| 7971639 | Device for conducting cementing operations and inflow regulation The present invention relates to a cementing or inflow regulation valve for conducting cementing operations or inflow regulation in a wellbore comprising a casing or tubing (2), wherein the cementing or inflow regulation valve (1) is inserted between t... | 07/05/2011 |
| 7708060 | One trip cemented expandable monobore liner system and method An apparatus to protect the mounting area of casing and a locating profile and optionally a sliding sleeve valve and a flow path from the outside of the valve to the annulus when subsequent attachment of an expanded liner is intended and the expanded liner is to be ... | 05/04/2010 |
| 7694732 | Diverter tool The present invention relates to a diverter tool used in a pipe string to lower a liner into a partially cased wellbore. The diverter tool has a diverter body that defines a longitudinal central flow passage and has diverter ports defined therethrough to communicate... | 04/13/2010 |
| 7610959 | Methods and materials for subterranean fluid forming barriers in materials surrounding wells Disclosed is a method and material for forming a fluid barrier in the material surrounding a wellbore. The method involves temporarily opening a fracture extending from the wellbore and then depositing particulates in the fracture which will swell when exposed to th... | 11/03/2009 |
| 7481272 | 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... | 01/27/2009 |
| 7438133 | Apparatus and method for radially expanding and plastically deforming a tubular member An apparatus for radially expanding and plastically deforming a tubular member that includes a valve assembly for permitting the injection of a hardenable fluidic sealing material into an annulus between the tubular member and a preexisting structure. ... | 10/21/2008 |
| 7434623 | Percussion tool and method A percussion apparatus and method of using the percussion apparatus. The apparatus may be used for delivering an impact to a tubular string. The apparatus comprises a cylindrical member having an internal bore containing an anvil and a first guide profile. The appar... | 10/14/2008 |
| 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 |
| 7409991 | Methods of using casing strings in subterranean cementing operations Improved casing strings, and methods of using improved casing strings in subterranean cementing operations, are provided. An example of an apparatus is a pipe string comprising at least one pipe section and a delivery system of an activator. Another example of an ap... | 08/12/2008 |
| 7387159 | Blending system for solid/fluids mixtures The disclosure concerns a method and a system for monitoring the composition of a cement slurry or wellbore service fluid, the method and system including one or more feeder units for solid particulate material; one or more mixing or blending units adapted to receiv... | 06/17/2008 |
| 7373980 | Mono-trip cement thru completion In systems and methods for production of hydrocarbons fluids from a formation surrounding a wellbore, a production assembly is cemented into place, and excess cement is then cleaned from the production tubing and liner. Thereafter, hydrocarbon fluids are produced an... | 05/20/2008 |
| 7370698 | Method and apparatus for transferring rig weight to tubulars A multi-functional apparatus and method for drilling fluid and cementing operations to set casing in a wellbore for use on either top drive or rotary type rigs. The apparatus and method includes a fill-up and circulating tool, a cementing head assembly, a wiper plug... | 05/13/2008 |
| 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 |
| 7337840 | One trip liner conveyed gravel packing and cementing system A well completion assembly including apparatus for gravel packing and cementing in a single trip. An outer assembly comprises: a liner and screen; a valved gravel packing port; upper and lower valved cementing ports; and seal bores positioned below and above the gra... | 03/04/2008 |
| 7325610 | Methods and apparatus for handling and drilling with tubulars or casing The present invention provides a method and apparatus for handling tubulars and drilling with tubulars such as casing into a formation. In one aspect of the invention, the apparatus comprises a circulating head and a cementing head operatively connectible to a gripp... | 02/05/2008 |
| 7322412 | Casing shoes and methods of reverse-circulation cementing of casing A method having the following steps: running a circulation valve comprising a reactive material into the well bore on the casing; reverse-circulating an activator material in the well bore until the activator material contacts the reactive material of the circulatio... | 01/29/2008 |
| 7322413 | Equalizer valve assembly A method for controlling a fluid pressure applied to a cementing plug comprises disposing the cementing plug within a casing string to define a trapped volume of fluid within the casing string, isolating a portion of the trapped volume of fluid adjacent the cementin... | 01/29/2008 |
| 7311148 | Methods and apparatus for wellbore construction and completion The present invention relates methods and apparatus for lining a wellbore. In one aspect, a drilling assembly having an earth removal member and a wellbore lining conduit is manipulated to advance into the earth. The drilling assembly includes a first fluid flow pat... | 12/25/2007 |
| 7290611 | Methods and systems for cementing wells that lack surface casing Methods and systems for cementing casing in well bores drilled in subterranean formations, and more particularly, methods and systems for cementing casing in a well bore without surface casing or a well head are provided. A method provided herein may comprise sealin... | 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 |
| 7281582 | Double swivel apparatus and method A double swivel for use with a top drive power unit supported for connection with a well string in a well bore to selectively impart longitudinal and/or rotational movement to the well string, a feeder for supplying a pumpable substance such as cement and the like f... | 10/16/2007 |
| 7270177 | Instrumented packer A technique that is usable with a subterranean well includes communicating a fluid into a region of the well and monitoring a level of the fluid communicated via a downhole sensor. The communication is controlled in response to the monitoring. ... | 09/18/2007 |
| 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 |
| 7252152 | Methods and apparatus for actuating a downhole tool The present invention relates to apparatus and methods for remotely actuating a downhole tool. In one aspect, the present invention provides an apparatus for activating a downhole tool in a wellbore, the downhole tool having an actuated and unactuated positions. The... | 08/07/2007 |
| 7252147 | Cementing methods and systems for initiating fluid flow with reduced pumping pressure A method of initiating fluid circulation in a well bore through a casing inner diameter and an annulus outside the casing, the method having the following steps: inducing an increase in the annulus fluid pressure; flowing cement composition into the annulus at the t... | 08/07/2007 |
| 7249632 | Top drive swivel apparatus and method For use with a top drive power unit supported for connection with a well string in a well bore to selectively impart longitudinal and/or rotational movement to the well string, a feeder for supplying a pumpable substance such as cement and the like from an external ... | 07/31/2007 |
| 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 |
| 7228897 | Cement through side pocket mandrel Well completion cement may be pumped through a side pocket mandrel that includes parallel rows of filler sections to exclude cement from void space within the side pocket tube. The filler sections are drilled with cross-flow jet channels and surface upsets to stimul... | 06/12/2007 |
| 7225871 | Apparatus and method for reverse circulation cementing a casing in an open-hole wellbore A system for cementing a casing in an open wellbore having no surface casing, wherein an annulus is defined between the casing and the wellbore, the system having: an annular plug around the casing at the mouth of the wellbore; a cement composition pump fluidly conn... | 06/05/2007 |
| 7219732 | Methods of sequentially injecting different sealant compositions into a wellbore to improve zonal isolation Methods of sealing a wellbore include sequentially displacing a first sealant composition and a second sealant composition different from the first sealant composition into the wellbore, followed by allowing the first and second sealant compositions to set. In an em... | 05/22/2007 |
| 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 |
| 7182135 | Plug systems and methods for using plugs in subterranean formations A method and plug for separating fluids in subterranean wells is provided. The plug enters a passage at an interface of successively introduced fluids. The plug comprises an outer body and a detachable inner mandrel attached to the outer body. An Assembly comprising... | 02/27/2007 |
| 7172021 | Liner hanger with sliding sleeve valve An apparatus and method for forming or repairing a wellbore casing, a pipeline, or a structural support. An expandable tubular member is radially expanded and plastically deformed by an expansion cone that is displaced by hydraulic pressure. Before or after the radi... | 02/06/2007 |
| 7124816 | Liquid separation device A device for keeping liquids separate in a pipe, especially for use in a petroleum well, where the device comprises a diaphragm, which in its operative position and through use of pretensioned slats is stretched across the cross section of the pipe, and where each o... | 10/24/2006 |
| 7117940 | Expander for expanding a tubular element An apparatus and method for expanding a wellbore tubular such as a casing is provided. The apparatus includes: an expandable casing; a drill string extending to within the drillstring; an expansion cone suspended from the drillstring, the expansion cone having an ex... | 10/10/2006 |
| 7100697 | Method and apparatus for reforming tubular connections The present invention generally relates to methods and apparatus for connecting tubulars and reforming the connection between the tubulars. In one aspect of the invention, the tubulars are aligned, connected, and then reformed at the connection. In one embodiment, t... | 09/05/2006 |
| 7096948 | Method and multi-purpose apparatus for dispensing and circulating fluid in wellbore casing A multi-functional apparatus and method for drilling fluid and cementing operations to set casing in a wellbore for use on either top drive or rotary type rigs. The apparatus and method includes a fill-up and circulating tool, a cementing head assembly, and a wiper ... | 08/29/2006 |
