Did You Know...
...that when IBM conducted a market study of Chester Carlson's invention in 1959, the company concluded that it would take only 5000 units of his new product to saturate the market? IBM therefore declined to be part of the new product introduction. Too bad for IBM. Carlson's invention was the xerography process, and his new product was the beginning of the Xerox Corporation. It is estimated that every day, worldwide, 3,000,000,000 copies are made!!
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| Number | Title | Issue Date |
| 7350578 | Diverter plugs for use in well bores and associated methods of use Zonal isolation of well bores is often desirable for performing downhole operations such as stimulation operations. In certain embodiments, diverter plugs for achieving zonal isolation in a casing string in a well bore may comprise a mandrel having a first end and a... | 04/01/2008 |
| 7275595 | Method and apparatus to isolate fluids during gravel pack operations The present invention provides for an apparatus and method to displace fluids and to prevent the mixing or bypassing of fluids used in gravel pack operations. A moveable plug is used to create a physical partition between fluids. ... | 10/02/2007 |
| 7165634 | Method and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells The steel drill string attached to a drilling bit during typical rotary drilling operations used to drill oil and gas wells is used for a second purpose as the casing that is cemented in place during typical oil and gas well completions. Methods of operation are des... | 01/23/2007 |
| 7163066 | Gravity valve for a downhole tool A gravity valve for a downhole tool for use in a subterranean well and a method of use thereof. The gravity valve is adapted to control the flow of a dowuhole fluid through the downhole tool. The gravity valve typically includes a plunger and a seat. The plunger may... | 01/16/2007 |
| 7147068 | Methods and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells The steel drill string attached to a drilling bit during typical rotary drilling operations used to drill oil and gas wells is used for a second purpose as the casing that is cemented in place during typical oil and gas well completions. Methods of operation are des... | 12/12/2006 |
| 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 |
| 7048050 | Method and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells The steel drill string attached to a drilling bit during typical rotary drilling operations used to drill oil and gas wells is used for a second purpose as the casing that is cemented in place during typical oil and gas well completions. Methods of operation are des... | 05/23/2006 |
| 7044226 | Method and a device for removing a hydrate plug A method and a device for removing a hydrate plug (38) from a pipeline (16), wherein a pig (1), which is connected to an umbilical (2) extending to surface, is displaced down into the pipeline (16) until proximity of the hydrate pl... | 05/16/2006 |
| 7036610 | Apparatus and method for completing oil and gas wells A method of drilling and completing a wellbore in a geological formation to produce hydrocarbons from a well comprising at least the following four steps: drilling the well with a retrievable drill bit attached to a casing; removing the retrievable drill bit from th... | 05/02/2006 |
| 6997253 | 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 ... | 02/14/2006 |
| 6973966 | Compressible darts and methods for using these darts in subterranean wells The present invention relates generally to subterranean well construction, and more particularly, to improved darts and methods of using these darts in subterranean wells. In one embodiment, the present invention provides a dart for activating a plug located within ... | 12/13/2005 |
| 6973969 | Apparatus and methods for preventing or limiting rotation of cementing plugs Methods and apparatus for preventing or limiting the rotation of downhole tools, such as cementing plugs, in a casing string during drillout. The apparatus includes an outer case and a radially expandable sleeve disposed therein. The sleeves will engage cementing pl... | 12/13/2005 |
| 6951246 | Self-anchoring cementing wiper plug A self-retaining cementing wiper plug has two or more steel or carbide tipped holddown fingers or slips extending radially outward from the plug for engaging the inner surface of the casing and preventing the plug from moving uphole over time and potentially interfe... | 10/04/2005 |
| 6923255 | Activating ball assembly for use with a by-pass tool in a drill string A by-pass tool to be incorporated in a drill string, in combination with an activating ball assembly operative to adjust the tool between an activated mode and a de-activated mode. The tool has a valve seat engageable by the activating ball assembly to move its slee... | 08/02/2005 |
| 6920933 | Platform for delivery of downhole tools A platform is used to deliver a tool down a hole by controlling the flow of fluid through and around the platform. The platform has a top surface for receiving the tool. The platform also has a bottom surface to provide guidance through and resistance to the flow of... | 07/26/2005 |
| 6896051 | 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 ... | 05/24/2005 |
| 6868908 | 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 ... | 03/22/2005 |
| 6796377 | Anti-rotation 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 ... | 09/28/2004 |
| 6739391 | Surface deployed cement separation plug A separation barrier for placement in an open well bore or casing, to prevent migration of cement slurry downwardly into the drilling fluid, facilitating the placement of a cement plug to segregate a well bore into uphole and downhole portions. The barrier has an an... | 05/25/2004 |
| 6527057 | Wiper plug delivery apparatus An apparatus and method for delivering a liner wiper plug into a well bore on a workstring with a liner pipe, releasing the wiper plug from the workstring, and giving a positive indication of release of the wiper plug. A sleeve captures a collet to a latc... | 03/04/2003 |
| 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 |
| 6401822 | Float valve assembly for downhole tubulars A check valve assembly for the bottom of a casing string with increased open area is provided. Multiple check valves are provided for assurance of ultimate closure. Bypass flow paths are available during run in that increase the normal available open area... | 06/11/2002 |
| 6170573 | Freely moving oil field assembly for data gathering and or producing an oil well An oil field assembly for gathering data about or producing an oil well having a self regulating assembly for free movement by gravity or the differential pressure of fluids in the tubing string of a well from the surface of a well or to predetermined dow... | 01/09/2001 |
| 6006828 | Apparatus for the remote deployment of valves Apparatus for the remote deployment of one or more valves (1), comprising channel means (2) through which the valve (1) will be deployed, channel location means (3) in which the valve (1) will sit, seal means (4) to seal between the valve (1) and the chan... | 12/28/1999 |
| 5950724 | Lifting top drive cement head A subsea lifting top drive cement head in which cement flows from the top. The cement head includes lower and upper assemblies with a bore for fluid flow, and a body in sure lock connection with the lower and upper assemblies and having a dart cage to pre... | 09/14/1999 |
| 5890537 | Wiper plug launching system for cementing casing and liners A wiper plug launching tool includes a body arranged to be lowered into a liner on a running string, the body having a tubular upper portion and a cylindrical lower portion, upper and lower wiper plugs loaded into the lower portion, each of the plugs havi... | 04/06/1999 |
| 5842517 | Anti-rotational cementing apparatus The apparatus of the present invention is a mechanism for use in cementing a casing string in a well bore comprising a float collar connectable to the casing string, a cement plug engagable to the float collar, and a wiper plug engagable to the cement plu... | 12/01/1998 |
| 5803167 | Computer controlled downhole tools for production well control A plurality of electronically controlled downhole tools and systems for use in production wells is presented. These tools and systems include safety valve and pressure monitoring systems, remotely controlled inflation/deflation devices, remotely actuated ... | 09/08/1998 |
| 5762139 | Subsurface release cementing plug apparatus and methods The present invention provides an improved subsurface release cementing plug apparatus for use in a string of pipe during the cementing of the pipe in a well bore. The apparatus includes a hollow cementing plug seat member adapted to be connected in the s... | 06/09/1998 |
| 5553667 | Cementing system A new 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 dart receive... | 09/10/1996 |
| 5435386 | Cementing plug Cementing plugs for use in the cementing of casing in oil and gas wells. The cementing plugs are well-suited for use with a polycrystalline diamond compact drill bit.... | 07/25/1995 |
| 5390736 | Anti-rotation devices for use with well tools An anti-rotation device for use in a well tool, for example a top plug or a bottom plug, has a tapered male member having a corrugated outer surface which can enter a corresponding recess in another well tool to inhibit relative rotation therebetween.... | 02/21/1995 |
| 5284208 | Production logging system using through flow line tools A system is provided for deploying, operating and recovering well tools through flow lines. A system is also provided for deploying, operating and recovering a through flow line production logging system, the preferred system being characterized by the us... | 02/08/1994 |
| 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 |
| 5191932 | Oilfield cementing tool and method A method of cementing oil well casings and a cementing tool used when performing the method are provided. A novel top cementing plug functions in a conventional manner during proper oil well casing cementing operations, but if inserted into the oil well c... | 03/09/1993 |
| 5165473 | Positive stop collar In accordance with an illustrative embodiment of the present invention, a positively operable stop collar for providing a bridge in a well casing that prevents reverse flow of cement slurry includes a tubular body having upper and lower stop rings positio... | 11/24/1992 |
| 5165474 | Anti-rotation device for cementing plugs with deformable peripheral "fins" o "lips" Cement plugs used in the cementing of casing in a borehole drilled into a subterranean formation are restrained from rotation by being forced into a portion of the casing and check valve apparatus which includes a reduced diameter section formed as a cont... | 11/24/1992 |
| 5163515 | Pumpdown toolstring operations in horizontal or high-deviation oil or gas wells Pumpdown toolstring for performing operations requiring application of power downhole in horizontal or high-deviation oil or gas wells, comprising an elongate toolstring element (30), locomotive devices (31, 32A) on said toolstring element, with at least ... | 11/17/1992 |
| 5113940 | 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... | 05/19/1992 |
