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| Number | Title | Issue Date |
| 7383889 | Mono diameter wellbore casing An apparatus and method for forming a mono diameter wellbore casing. ... | 06/10/2008 |
| 7222669 | Method of repair of collapsed or damaged tubulars downhole A method of repairing tubulars downhole is described. A swage is secured to a force magnification tool, which is, in turn, supported by an anchor tool. Applied pressure sets the anchor when the swage is properly positioned. The force magnification tool strokes the s... | 05/29/2007 |
| 7128154 | Single-direction cementing plug The present invention generally relates to apparatus and methods for completing a well. Particularly, the present invention relates to a single-direction plug for use with cementing applications and with drilling with casing applications. One embodiment comprises a ... | 10/31/2006 |
| 7114573 | Hydraulic setting tool for liner hanger Embodiments of the present invention relates to hydraulically actuated tools, which may be used to actuate a liner hanger assembly. In one embodiment, the present invention provides a hydraulic setting tool for use in wellbore operations. The setting tool includes a... | 10/03/2006 |
| 7021385 | Method and apparatus for controlling well pressure in open-ended casing A system and method for preventing blowouts during the deployment of a casing string into a wellbore. The system includes securing a casing coupling to a casing string and securing a retrievable check valve within the casing coupling. The retrievable check valve all... | 04/04/2006 |
| 6918441 | Cup tool for high pressure mandrel A cup tool for use with a mandrel of a wellhead isolation tool has a substantially right-angled stepped shoulder over which an elastomeric sealing element is forced by elevated fluid pressures. A top end of the elastomeric sealing element is inhibited from extrusion... | 07/19/2005 |
| 6536532 | Lock ring for pipe slip pick-up ring A selectively released well packer is set between a pair of anchor shoe assemblies. Each assembly comprises a tubular setting sleeve having finger projections meshed with an anchor shoe cage. Wicker shoes are confined by the shoe cage. The packer seal and... | 03/25/2003 |
| 4588030 | Well tool having a metal seal and bi-directional lock A well tool, for setting in a nipple having a locking notch, including a body with initially retracted first and second locking dogs with a threaded actuator for moving the first and second dogs axially relative to each other and into engagement with the ... | 05/13/1986 |
| 4586567 | Subterranean well tool with pressure-equalizing release A retrievable well tool for use in a subterranean well conduit utilizes plural valving elements to establish a fluid bypass around at least one annular elastomeric sealing element in response to movement of a control mandrel. The annular elastomeric seali... | 05/06/1986 |
| 4478279 | Retrievable inside blowout preventer valve apparatus A retrievable inside blowout preventer valve apparatus for use in blocking undesired upwardly flow in the bore of a rotary drill string during well drilling operations is disclosed. The valve apparatus is installed and retrieved from a subsurface receiver... | 10/23/1984 |
