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| Number | Title | Issue Date |
| 7367401 | Ported velocity tube for gas lift operations An apparatus for use with a packer set within a well bore comprises a first flow path providing fluid communication between the well bore above the packer and the well bore below the packer, and a second flow path. A system for gas lifting fluids from a well bore wi... | 05/06/2008 |
| 7093674 | Drilling formation tester, apparatus and methods of testing and monitoring status of tester An integrated drilling and evaluation system includes a drill string having an interior portion and a drill bit, carried on a lower end, that includes ports for communicating fluid between the interior portion of the drill string and an uncased well bore. A packer, ... | 08/22/2006 |
| 7011157 | Method and apparatus for cleaning a fractured interval between two packers A method and apparatus for fluid treatment of a selected interval of a well and then cleaning the selected interval and the apparatus of treatment residue. An straddle tool is run into the well to treatment depth on fluid supplying tubing and has upper and lower pac... | 03/14/2006 |
| 6973971 | Down hole well cleaning apparatus An apparatus and a method for cleaning the open perforations in a well and for bailing a well. The apparatus has a tubular conduit with at least one seal attached to it that forms a seal between the well casing and the exterior of the conduit. The seal is held in pl... | 12/13/2005 |
| 6918440 | Testing drill packer One embodiment of the present disclosure describes a test assembly including an inflatable packer. An internal control sleeve controls flow of drilling fluid through an inflation port to inflate and deflate the packer. A shifting tool run on a slick line moves the s... | 07/19/2005 |
| 6651738 | Downhole isolation device with retained valve member A downhole zone isolation device is disclosed that features a non-spherical valve member that will not rotate while being drilled out. The valve member is retained in the isolation device so that flow uphole will not allow the valve member to exit the bod... | 11/25/2003 |
| 6341652 | Backflow prevention device A system for preventing backflow of a fluid from one zone to another, e.g. from a lower wellbore zone to an upper wellbore zone. The system is deployed in cooperation with a tube, such as a tube utilized to protect electrical or optical signal transfer li... | 01/29/2002 |
| 6298916 | Method and apparatus for controlling fluid flow in conduits A completion string for use in a wellbore includes a main conduit, such as a production tubing, and one or more alternate path conduits, such as shunt tubes, that extend generally in parallel with the main conduit. A flow control device is positioned in e... | 10/09/2001 |
| 6220348 | Retrievable bridge plug and retrieving tool A retrievable bridge plug having an internal bypass passage and external retrieving lugs, and a retrieving tool therefor. When the bypass passage is sealed, both the top and bottom openings of the bypass passage are closed, preventing debris from entering... | 04/24/2001 |
| 5193621 | Bypass valve A bypass valve for bypassing well fluids, and method of use thereof. The valve comprises a tubular housing defining a bypass port therethrough with an inner sleeve mandrel defining a bypass port initially aligned with the bypass port in the housing. The v... | 03/16/1993 |
| 5018574 | Tubing conveyed wellbore fluid flow measurement apparatus Wellbore fluid flow rates and other fluid properties may be measured by a tool which is insertable in the wellbore on the end of a tubing string and includes an instrument section and an inflatable packer disposed on the tool for inflation by conducting p... | 05/28/1991 |
| 4582140 | Well tool with selective bypass functions A downhole tool such as a formation tester valve which provides a bypass while allowing a choice of several possible functions of this bypass to be made by rearrangement of the parts of the tool. In a first arrangement, a bypass is provided which is open ... | 04/15/1986 |
| 4372388 | Subsurface control valve A subsurface control valve for use in shutting off a well bore. The valve comprises a valve assembly and a stinger assembly, which is run into the well bore on drill pipe with a packer placed below the valve in the string. The valve is open as the string ... | 02/08/1983 |
