Patent application number | Description | Published |
20080196882 | Slip Spool Assembly and Method of Using Same - A slip spool includes radially disposed actuators for radially moving slip blocks between a loose encirclement position in which they surround the tubing string and a cached position in which the slip blocks clear an axial passage of the slip spool. The slip spool further includes axially disposed actuators for axially displacing the slip blocks between the loose encirclement position and an engagement position in which the slip blocks are seated within a slip bowl of the slip spool so that a weight of the suspended tubing string causes the slip blocks to tightly grip the tubing string. The slip spool facilitates positioning and repositioning of the tubing string in the wellbore and can be used for supporting or snubbing a tubing string in a live well bore. | 08-21-2008 |
20080251251 | Wellhead and control stack pressure test plug tool - A test plug tool for use in testing a pressure integrity of a pressure control stack mounted to a wellhead, including a joint between a casing and a casing support in the wellhead. The test plug tool includes a test plug of an appropriate diameter used to pressure test the pressure control stack as well as a joint between any one of a surface casing and the wellhead, an intermediate casing and an intermediate casing mandrel, and a production casing and a production casing mandrel. The pressure integrity of the wellhead is ensured at each stage of well drilling and well completion, and safety is improved. Optionally, a backpressure valve permits pressurized fluid that leaks below the test plug tool to flow upwardly through a central bore in a landing tool that is secured to the test plug tool to permit detection of the leak. | 10-16-2008 |
20090025925 | MULTI-LOCK ADAPTERS FOR INDEPENDENT SCREWED WELLHEADS AND METHODS OF USING SAME - A multi-lock adapter used to inject high-pressure well stimulation fluids through an independent screwed wellhead includes an adapter pin having a central passageway with an internal diameter at least as large as a passageway through the wellhead. A lockdown flange secures the adapter pin to a casing mandrel of the wellhead. The lockdown flange ensures that stress on connection points to the screwed independent wellhead due to elevated fluid pressures used for well stimulation procedures does not exceed engineered specifications. | 01-29-2009 |
20090084538 | 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 ring gasket or two contacting metal surfaces that are machined to required tolerances and are configured to be forced together when the drilling flange is mounted to the wellhead. The metal-to-metal seal ensures a fluid seal between the flange body and the wellhead in the event that the O-rings malfunction or are destroyed by fire. | 04-02-2009 |
20090091131 | HIGH-PRESSURE THREADED UNION WITH METAL-TO-METAL SEAL, AND METAL RING GASKET FOR SAME - A metal ring gasket provides a high-pressure temperature tolerant metal-to-metal seal between subcomponents of a threaded union. The metal ring gasket is received in an annular cavity formed between mating surfaces of the subcomponents of the threaded union. The metal ring gasket is capable of maintaining a fluid seal even at very high temperatures resulting from direct exposure to fire. At high fluid pressures the metal ring gasket is energized because hoop stress induced by the fluid pressure forces the metal ring gasket into tighter contact with the subcomponents of the threaded union. | 04-09-2009 |
20090095933 | GATE VALVE WITH REPLACEABLE INSERTS AND METHOD OF REFURBISHING SAME - A gate valve includes a valve body having a cylindrical passage defining a flow path through the valve, a gate for controlling fluid flow through the valve and a replaceable wear-resistant flow-path liner for in the flow path. The flow-path liner includes a plurality of replaceable wear-resistant inserts, including wear sleeves lining ports of the valve body, valve seats and a gate insert for a flow path bore through the gate. Each replaceable valve seat has a wiper ring for cleaning the gate when it opens and closes. By regularly inspecting and replacing worn-out inserts, the service life of the gate valve can be prolonged and the expense associated with replacing or rebuilding the valve body is avoided. | 04-16-2009 |
20090114397 | 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 is secured by a threaded union to an intermediate head spool. The intermediate head spool is secured by another threaded union to a wellhead. Each tubular head secures and suspends a tubular string in the well bore. The hybrid wellhead system is capable of withstanding higher fluid pressures than a conventional independent screwed wellhead, while providing a more economical alternative to a flanged, or ranged, wellhead system because it is less expensive to construct and faster to assemble. | 05-07-2009 |
20090160186 | Threaded union for tubulars used in high-pressure fluid applications - a threaded union for tubulars used for high-pressure fluid applications includes a unitary nut supported by at least two nut retainer segments received under a top wall of the nut in an annular segment retainer groove in one of the tubulars. The nut retainer segments fully support the unitary nut. The nut retainer segments are held in the annular segment retainer groove by limiting travel of the nut or by securing the nut retainer segments in the segment retainer groove. | 06-25-2009 |
20090236090 | Erosion Resistant Frac Head - An erosion resistant frac head with a convergence chamber, an expansion chamber and a mixing chamber provides improved resistance to erosion caused by abrasive frac fluids pumped through the frac head. In one embodiment, a bottom leg of the erosion resistant frac head may be replaced in the field by field hands. In another embodiment, top entry ports of the frac head may also be replaced in the field by field hands. | 09-24-2009 |
20100012329 | 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 the casing mandrel. | 01-21-2010 |
20100051258 | FRACTURING HEAD WITH REPLACEABLE INSERTS FOR IMPROVED WEAR RESISTANCE AND METHOD OF REFURBISHING SAME - Fracturing heads with one or more replaceable wear-resistant inserts have annular sealing elements for inhibiting fracturing fluids from circulating between the inserts and a main body of the fracturing head. Worn inserts and degraded sealing elements are easily replaced to refurbish the fracturing head without replacing or rebuilding the main body. Service life of the main body is therefore significantly prolonged. In one embodiment, an entire flow path through the main body is lined with wear-resistant replaceable inserts to further prolong the service life of the main body. | 03-04-2010 |
20100096852 | HIGH-PRESSURE THREADED UNION WITH METAL-TO-METAL SEAL, AND METAL RING GASKET FOR SAME - A metal ring gasket provides a high-pressure temperature tolerant metal-to-metal seal between subcomponents of a threaded union. The metal ring gasket is received in an annular cavity formed between mating surfaces of the subcomponents of the threaded union. The metal ring gasket is capable of maintaining a fluid seal even at very high temperatures resulting from direct exposure to fire. At high fluid pressures the metal ring gasket is energized because hoop stress induced by the fluid pressure forces the metal ring gasket into tighter contact with the subcomponents of the threaded union. | 04-22-2010 |
20100181063 | MULTI-LOCK ADAPTERS FOR INDEPENDENT SCREWED WELLHEADS AND METHODS OF USING SAME - A multi-lock adapter used to inject high-pressure well stimulation fluids through an independent screwed wellhead includes an adapter pin having a central passageway with an internal diameter at least as large as a passageway through the wellhead. A lockdown flange secures the adapter pin to a casing mandrel of the wellhead. The lockdown flange ensures that stress on connection points to the screwed independent wellhead due to elevated fluid pressures used for well stimulation procedures does not exceed engineered specifications. | 07-22-2010 |
20100187461 | HIGH-PRESSURE PLUG VALVE - A plug valve has a valve body, a cage fitted within the valve body and a rotatable plug housed within a cylindrical cavity in the cage, for controlling fluid flow through the valve. The cage has first and second opposed flat side surfaces, each side surface has a port for receiving a replaceable flow-path insert in a fluid-tight seal. In one embodiment, the plug also includes at least one inset seal for sealing the at least one of the ports when the plug is in a closed position to inhibit leakage through the valve at low fluid pressures. | 07-29-2010 |
20100218939 | 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 is secured by a threaded union to an intermediate head spool. The intermediate head spool is secured by another threaded union to a wellhead. Each tubular head secures and suspends a tubular string in the well bore. The hybrid wellhead system is capable of withstanding higher fluid pressures than a conventional independent screwed wellhead, while providing a more economical alternative to a flanged, or ranged, wellhead system because it is less expensive to construct and faster to assemble. | 09-02-2010 |
20100258294 | SLIP SPOOL ASSEMBLY AND METHOD OF USING SAME - A slip spool includes radially disposed actuators for radially moving slip blocks between a loose encirclement position in which they surround the tubing string and a cached position in which the slip blocks clear an axial passage of the slip spool. The slip spool further includes axially disposed actuators for axially displacing the slip blocks between the loose encirclement position and an engagement position in which the slip blocks are seated within a slip bowl of the slip spool so that a weight of the suspended tubing string causes the slip blocks to tightly grip the tubing string. The slip spool facilitates positioning and repositioning of the tubing string in the wellbore and can be used for supporting or snubbing a tubing string in a live well bore. | 10-14-2010 |
20100326648 | EROSION RESISTANT FRAC HEAD - An erosion resistant frac head with a convergence chamber, an expansion chamber and a mixing chamber provides improved resistance to erosion caused by abrasive frac fluids pumped through the frac head. A bottom leg of the erosion resistant frac head may be replaced in the field by field hands. | 12-30-2010 |
20110048698 | MULTIPART FRAC HEAD WITH REPLACEABLE COMPONENTS - A multipart frac head with removable components permits the frac head to be refurbished in the field. A bottom leg and inlet ports of the multipart frac head can be replaced. | 03-03-2011 |