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| Number | Title | Issue Date |
| 7373976 | Well production optimizing system A method and system for controlling a producing cycle in a well, during the production cycle, for optimizing production from the well including disrupting fluid in a wellbore with a pulse generator to create a pressure pulse transmitted through the fluid in the well... | 05/20/2008 |
| 7255162 | Methods and apparatus for use in subterranean cementing operations The present invention relates to subterranean cementing operations, and more particularly to an apparatus useful in loading cementing plugs and darts into tubulars, and methods of using such apparatus in subterranean cementing operations. An example of a method of t... | 08/14/2007 |
| 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 |
| 7219730 | Smart cementing systems The present invention provides methods and apparatus for determining the location of an apparatus in a wellbore. The method includes lowering the apparatus with a conveying member and measuring a parameter associated with the conveying member. Thereafter, the measur... | 05/22/2007 |
| 7207399 | Modular pressure control and drilling waste management apparatus for subterranean borehole operations A modularly segmented apparatus for precise borehole pressure control, removing waste from borehole fluid, and recirculating the cleaned borehole fluid includes a pressure control section, a gas separator section, and a waste management section. In the pressure cont... | 04/24/2007 |
| 7066256 | Apparatus and method of detecting interfaces between well fluids An apparatus for use in circulating cement in a casing in a wellbore is described having a first component such as a sensor disposed on the casing and a second component such as a detectable device disposed at a fluid interface formed between the cement and a fluid.... | 06/27/2006 |
| 7051760 | Three-way inline piggable branch valve A multi-port valve device to divert flow of a fluid from a piggable transfer pipe line into a branch pipeline, and simultaneously prevent a line clearing device (known as a pig or cleaning sphere) from flowing with that fluid into the branch pipeline. This device ca... | 05/30/2006 |
| 6953089 | Apparatus and method of detecting interfaces between well fluids An apparatus for use in circulating cement in a casing in a wellbore is described having a first component such as a sensor disposed on the casing and a second component such as a detectable device disposed at a fluid interface formed between the cement and a fluid.... | 10/11/2005 |
| 6789619 | Apparatus and method for detecting the launch of a device in oilfield applications A system for use in detecting the launching of a device, such as a wiper plug or a sealing ball, is described having a first component, such as a detectable object disposed within the device, and a second component, such as a sensor. The sensor may be a sensor coil,... | 09/14/2004 |
| 6098709 | Wellhead union with safety interlock A wellhead union and associated methods provide enhanced safety in operations involving access to, and/or fluid communication with, a wellhead. In a described embodiment, a wellhead union has a housing structure which includes a fluid conduit and a plug. ... | 08/08/2000 |
| 5967231 | Plug release indication method A method of indicating the release of a plug, such as a cementing plug for an oil or gas well, includes releasing a plug from a retained position in a tube system, and in response to releasing the plug, opening an electrical circuit to which the plug was ... | 10/19/1999 |
| 5957201 | Verification apparatus and method for a static wellhead plug A plug is provided which is specially adapted for statically setting a plug portion within an internal profile formed in a wellhead. In an illustrated preferred embodiment, the plug portion is set by application of fluid pressure to a running tool portion... | 09/28/1999 |
| 5544705 | Method for injecting fluid into a wellbore A method for injecting fluid, such as an accelerator, into a wellbore comprises storing the fluid in a reservoir, locating the reservoir downhole in the wellbore, and then transferring the fluid from the reservoir into the wellbore. More particularly, one... | 08/13/1996 |
| 5252918 | Apparatus and method for electromagnetically detecting the passing of a plug released into a well by a bridge circuit A plug released into an oil or gas well carries one or more metallic strips that affect the inductance of a resistive-inductive bridge circuit mounted adjacent a conduit through which the plug and fluids are pumped into the well. This unbalances the bridg... | 10/12/1993 |
| 5040603 | Sequential remote control plug release system A sequential remote control plug release system allows actuation of plug release plungers and manifold valves associated with a cementing plug container only in a predetermined sequence. With regard to a plug container having two plugs, and thus two plug ... | 08/20/1991 |
| 4427065 | Cementing plug container and method of use thereof A cementing plug container for enclosing and injecting cementing plugs into the casing of an oil or gas well to reduce contamination on the interface between the well fluid and the cement, which container includes a shaped housing containing one or more p... | 01/24/1984 |
| 4317486 | Cementing head apparatus and method of operation A cementing head is disclosed, which is particularly designed for injecting an omega-type cementing plug into a well casing. Prior to cementing, the plug is retained in a housing. Located above the plug is a movable plunger, actuated by an operating fluid... | 03/02/1982 |
