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| Number | Title | Issue Date |
| 8157005 | Casing mandrel for facilitating well completion, re-completion or workover A casing mandrel for an independent screwed wellhead includes a seal bore for receiving a fixed-point packoff connected to a high-pressure mandrel of a pressure isolation tool, and a pin thread adapted for engagement with a box thread of a tubing head supported by t... | 04/17/2012 |
| 7407011 | Tubing annulus plug valve A tubing hanger lands in a tubular outer wellhead member and supports a string of production tubing. The tubing hanger has a production passage for communicating with the interior of the production tubing and an annulus passage for communicating with a tubing annulu... | 08/05/2008 |
| 7392840 | Method and means to seal the casing-by-casing annulus at the surface for reverse circulation cement jobs A method for sealing an annulus defined between an outer casing and an inner casing, the method having steps as follows: fastening a lock ring to an anchor base, wherein the lock ring comprises a threaded fastener of the lock ring to the head; positioning the lock r... | 07/01/2008 |
| 7350562 | Drilling flange and independent screwed wellhead with metal-to-metal seal and method of use A drilling flange and an independent screwed wellhead provides a metal-to-metal seal that supplements the traditional elastomeric O-rings for providing a fluid seal between the drilling flange and the wellhead. The metal-to-metal seal may be achieved using a metal r... | 04/01/2008 |
| 7322378 | Semiconductor apparatuses and pipe supports thereof A semiconductor apparatus with a modified pipe support. The apparatus comprises an outer pipe, an inner pipe, and a pipe support. The support comprises a seat and a support ring. The seat comprises a tubular portion for supporting an outer pipe at a top end. The sup... | 01/29/2008 |
| 7322407 | Wellhead isolation tool and method of fracturing a well A wellhead assembly is provided including a casing and a tubular member mounted over the casing. A flange extends from the tubular member. A generally elongated annular member is provided in the tubular member. The generally elongated annular member has a first end ... | 01/29/2008 |
| 7308943 | Well operations system A wellhead has, instead of a conventional Christmas tree, a spool tree in which a tubing hanger is landed at a predetermined angular orientation. As the tubing string can be pulled without disturbing the tree, many advantages follow, including access to the producti... | 12/18/2007 |
| 7296631 | System and method for low-pressure well completion A low-pressure wellhead system with tubular heads and mandrels secured independently using threaded unions. A casing mandrel is secured to a wellhead by a first threaded union. Likewise, a tubing head spool is secured to the casing mandrel using a threaded union. A ... | 11/20/2007 |
| 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 |
| 7290612 | Apparatus and method for reverse circulation cementing a casing in an open-hole wellbore The present invention is directed to an apparatus and method for reverse circulation cementing a casing in an open-hole wellbore. The apparatus includes a surface pack-off device, which has a housing defined by an upper section and lower section. A load bearing plat... | 11/06/2007 |
| 7255163 | Convertible rotary seal for progressing cavity pump drivehead A convertible rotary seal has a housing for receiving a polish rod. A mandrel is rotatably mounted in the seal housing and surrounds the polish rod. A wear sleeve surrounding the mandrel engages a primary seal. A secondary seal engages the mandrel and polish rod and... | 08/14/2007 |
| 7237615 | Casing mandrel with well stimulation tool and tubing head spool for use with the casing mandrel A casing mandrel for an independent screwed wellhead includes a pin thread adapted for engagement with a box thread of a well stimulation tool lockdown nut for securing the well stimulation tool against the casing mandrel top end. A well stimulation tool and a tubin... | 07/03/2007 |
| 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 |
| 7198098 | Mechanical connection system A connector system is provided for connecting parts of an apparatus. A first part having one or more bayonet connectors and one or more retention pin receptacles cooperatively mates to a second part having one or more mating bayonet connectors. The second part furth... | 04/03/2007 |
| 7165620 | Wellhead completion system having a horizontal control penetrator and method of using same A well completion system includes a completion device defining a bore therein attached to a wellhead and a tool, disposed within the bore, comprising an operational element and a control receptacle in communication with the operational element. The system further in... | 01/23/2007 |
| 7159652 | Drilling flange and independent screwed wellhead with metal-to-metal seal and method of use A drilling flange and an independent screwed wellhead provides a metal-to-metal seal that supplements the traditional elastomeric O-rings for providing a fluid seal between the drilling flange and the wellhead. The metal-to-metal seal may be achieved using a metal r... | 01/09/2007 |
| 7159663 | Hybrid wellhead system and method of use A hybrid wellhead system is assembled using a plurality of threaded unions, such as spanner nuts or hammer unions, for securing respective tubular heads and a flanged connection for securing a flow control stack to a top of a tubing head spool. The tubing head spool... | 01/09/2007 |
| 7156039 | Keel guide system A technique for guiding a riser in an offshore environment. The technique utilizes a keel guide that permits the passage of connectors or other components therethrough. A bushing is mounted within the keel guide to guide the relative linear motion of the riser assem... | 01/02/2007 |
| 7066269 | Casing mandrel with well stimulation tool and tubing head spool for use with the casing mandrel A casing mandrel for an independent screwed wellhead includes a pin thread adapted for engagement with a box thread of a well stimulation tool lockdown nut for securing the well stimulation tool against the casing mandrel top end. A well stimulation tool and a tubin... | 06/27/2006 |
| 7063160 | Non-orienting tubing hanger system with a flow cage In a subsea wellhead assembly, a tubing hanger in communication with the subsea well has a hanger port extending through its side. A diverter surrounds the tubing hanger and diverts well fluid transmitted from the hanger port around a portion of the tubing hanger. T... | 06/20/2006 |
| 7032677 | Multi-lock adapters for independent screwed wellheads and methods of using same A lockdown flange for use with an independent screwed wellhead includes an annular body having a center passageway with an internal diameter at least as large as a passageway through the wellhead. The lock down flange may be used to construct a multi-lock adapter fo... | 04/25/2006 |
| 7013970 | Central circulation completion system A completion system comprises a christmas tree (10) mounted on a wellhead housing (11), a tubing hanger (12) landed in the tree or wellhead housing, the wellhead housing (11) being mounted on a casing string (100) and a tubing stri... | 03/21/2006 |
| 6966381 | Drill-through spool body sleeve assembly A drill-through spool body sleeve assembly comprises a test sleeve removably installed within a drill-through spool body having a bore with the terminal ends of the outer diameter of the test sleeve sealingly engaging the bore wall. The sleeve assembly also comprise... | 11/22/2005 |
| 6966383 | Horizontal spool tree with improved porting The horizontal spool tree assembly 10 controls fluid flow through a production tubing string 18 within a well. The horizontal spool tree assembly is adapted for use with a workover string for fluid communication with the tree assembly. The spool body | 11/22/2005 |
| 6953085 | Well pressure activated pack-off head The present invention discloses a well pressure activated pack off head comprising a hollow body formed for coaxial connection to the wellhead which provides for unobstructed passage of a data transmitting wireline therethrough. Disposed coaxially within the hollow ... | 10/11/2005 |
| 6823941 | Recovery of production fluids from an oil or gas well A flow diverter assembly for a tree, the flow diverter assembly having a flow diverter to divert fluids flowing through the production bore of the tree from a first portion of the production bore to the cap, and to divert the fluids back from the cap to a second por... | 11/30/2004 |
| 6796381 | Apparatus for extraction of oil via underground drilling and production location A well pressure control assembly includes an annular pressure containment structure useful for manipulating pipe during drilling and other well operations performed with annular pressure at the wellhead. The annular pressure containment structure includes a sealing ... | 09/28/2004 |
| 6763891 | Production tree with multiple safety barriers The wellhead assembly has a production tree with multiple safety barriers. A tubing hanger lands and seals in the bore of the tree. The tubing hanger has a lateral production flow passage that registers with a lateral passage in the tree. A tubing annulus passage ex... | 07/20/2004 |
| 6755254 | Horizontal spool tree assembly A horizontal spool tree assembly 10 is provided for supporting a production tubing string 22 within a well below a BOP. The spool body 12 includes a laterally extending passageway 36 which is in fluid communication with a similar laterall... | 06/29/2004 |
| 6640902 | Nested stack-down casing hanger system for subsea wellheads A wellhead system for petroleum producing wells comprises a "stack-down" casing hanger configuration. In this stack-down system, the hanger for each successively smaller diameter casing string is landed or "nested" within the hanger for the next larger ca... | 11/04/2003 |
| 6612371 | Wellhead system comprising a sliding sleeve seal The present invention is directed to a sealing sleeve which is disposed in a lateral fluid conduit that extends at least partially through a tubing hanger and a surrounding spool and which is slideable between a retracted position for running and retrieva... | 09/02/2003 |
| 6604579 | Pressure activated injection probe An injection probe assembly is disclosed for injecting material into subsurface formations for making geotechnical improvements. The probe assembly includes a sheath having an upper end for attaching to a mating tool string and a lower end for receiving a... | 08/12/2003 |
| 6588502 | Well pressure activated pack-off head A well pressure activated pack off head comprising a hollow body formed for coaxial connection to the wellhead which provides for unobstructed passage of a data transmitting wireline therethrough. Disposed coaxially within the hollow body is a pack off ru... | 07/08/2003 |
| 6581691 | Landing adapter for soft landing a tubing hanger in the bore of a production tree or wellhead housing A landing adapter is used to softly land a tubing hanger in the bore of a production tree. The landing adapter makes initial contact so that the tubing hanger does not have to absorb the harsh impact. The landing adapter has a hydraulic sleeve that stroke... | 06/24/2003 |
| 6557629 | Wellhead isolation tool A wellhead isolation tool for use with a wellhead assembly from which a tubing string is suspended comprises a tubular mandrel which includes an axial passage that extends therethrough and lower end that is adapted to engage the tubing string, a pumping h... | 05/06/2003 |
| 6520259 | Method and apparatus for fluid entrainment The present invention presents an improved method and apparatus for liquid entrainment by a two-phase flow system. The present invention provides an apparatus that recovers liquids by entrainment without experiencing deadhead conditions, choking or dry re... | 02/18/2003 |
| 6520263 | Retaining apparatus for use in a wellhead assembly and method for using the same A retaining apparatus, in particular an internal tree cap, for use in a wellhead having a central bore and first and second retaining means, such as a shoulder and a groove, within the bore of the wellhead. The retaining apparatus has a housing for locati... | 02/18/2003 |
| 6386291 | Subsea wellhead system and method for drilling shallow water flow formations A shallow water flow subsea drilling system is disclosed. A wellhead system is provided with a 36" conductor pipe in which a 26" casing and 26" wellhead housing are landed. The 26" casing extends to a depth above a shallow water flow zone. A borehole thro... | 05/14/2002 |
| 6311770 | Pitless adapter assembly A pitless adapter assembly for a water well system or the like operable by a pump suspended in the well below the pitless adapter assembly to pump underground water upwardly through a plastic supply pipe to a feed pipe through a fitting in a well casing, ... | 11/06/2001 |
| 6302212 | Tubing hanger and tree with horizontal flow and annulus ports A well production assembly includes a production tree which has a lateral production passage extending laterally from a vertical bore of the tree. A tubing hanger, also having a lateral production passage, lands in the tree, with the lateral passages regi... | 10/16/2001 |
