WO1998057029A1 - Pressure equalizing safety valve for subterranean wells - Google Patents
Pressure equalizing safety valve for subterranean wells Download PDFInfo
- Publication number
- WO1998057029A1 WO1998057029A1 PCT/US1998/012121 US9812121W WO9857029A1 WO 1998057029 A1 WO1998057029 A1 WO 1998057029A1 US 9812121 W US9812121 W US 9812121W WO 9857029 A1 WO9857029 A1 WO 9857029A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- equalizing
- valve
- plug
- valve member
- ofthe
- Prior art date
Links
- 239000012530 fluid Substances 0.000 claims abstract description 70
- 238000007789 sealing Methods 0.000 claims description 49
- 230000006835 compression Effects 0.000 claims description 10
- 238000007906 compression Methods 0.000 claims description 10
- 230000013011 mating Effects 0.000 claims description 4
- 230000007246 mechanism Effects 0.000 abstract description 26
- 239000000463 material Substances 0.000 description 5
- 230000002093 peripheral effect Effects 0.000 description 2
- 230000003213 activating effect Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- ZPUCINDJVBIVPJ-LJISPDSOSA-N cocaine Chemical compound O([C@H]1C[C@@H]2CC[C@@H](N2C)[C@H]1C(=O)OC)C(=O)C1=CC=CC=C1 ZPUCINDJVBIVPJ-LJISPDSOSA-N 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000004033 diameter control Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/06—Valve arrangements for boreholes or wells in wells
- E21B34/10—Valve arrangements for boreholes or wells in wells operated by control fluid supplied from outside the borehole
- E21B34/101—Valve arrangements for boreholes or wells in wells operated by control fluid supplied from outside the borehole with means for equalizing fluid pressure above and below the valve
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B2200/00—Special features related to earth drilling for obtaining oil, gas or water
- E21B2200/05—Flapper valves
Definitions
- the present invention relates to a subsurface safety valve used for controlling fluid flow in a well conduit and, more particularly, to an equalizing subsurface safety valve.
- Subsurface safety valves are commonly used in wells to prevent uncontrolled fluid flow through the well in the event of an emergency, such as to prevent a well blowout.
- the present invention solves these difficulties by providing a subsurface safety valve with an equalizing mechanism to allow the pressure above and below the flapper to equalize prior to the complete opening of the flapper.
- the equalizing subsurface safety valve of the present invention includes a body member having a longitudinal bore extending therethrough; a valve actuator disposed for axial movement within the longitudinal bore; means for controllably moving the valve actuator within the longitudinal bore; a valve member mounted within the body member to control fluid flow through the longitudinal bore, the valve member having an upper surface, a lower surface, and a bore therethrough; means for biasing the valve member to a normally closed position to prevent fluid flow through the longitudinal bore; means for biasing the valve actuator away from the valve member; an equalizing plug disposed for reciprocal movement within the bore of the valve member for controlling fluid flow through the valve member; a strike plate having a periphery and an actuating member, the strike plate extending into a path of the valve actuator, the actuating member extending downwardly from the strike plate into the bore through the valve member and being connected to the equalizing plug; and a spring
- the means for controllably moving the valve actuator within the longitudinal bore includes a piston and cylinder assembly mounted to the body member with one side of the assembly adapted to be in communication with a source of hydraulic fluid for moving the valve member to the open position to permit fluid flow through the longitudinal bore.
- the valve member is a flapper valve.
- the valve member is a curved flapper valve.
- the equalizing plug is a generally cylindrical plug having an upper portion and an enlarged annular sealing surface adjacent a first end thereof for cooperable sealing engagement with a sealing surface formed within the bore of the valve member.
- the enlarged annular sealing surface further includes a metallic annular sealing surface.
- the sealing surface within the bore of the valve member further includes an annular sealing surface.
- the annular sealing surface within the plug bore further includes a metallic portion and a pliable portion.
- the equalizing plug is held in a normally closed position by action of the spring against the strike plate.
- the upper portion of the equalizing plug is disposed below the upper surface of the valve member.
- fluid pressure within the well conduit is equalized through an internal fluid flow passageway formed through the equalizing plug and strike plate.
- the equalizing plug further includes an upper portion having a generally longitudinal bore, a generally longitudinal passageway, and at least one generally radially disposed opening, the bore extending downwardly from an upper surface of the equalizing plug and having a threaded portion, the passageway extending downwardly from the bore and being disposed in fluid communication with the at least one radially disposed opening, the at least one radially disposed opening exiting the plug at a location between a lower surface of the bore and the sealing surface on the shoulder of the plug; and the actuating member further includes a shank having a threaded portion for mating with the threaded portion of the bore in the upper portion of the plug, and a generally longitudinal passageway extending upwardly from a lower surface on the shank through the actuating member to an upper surface of the strike plate and cooperating with the longitudinal passageway and the at least one radially disposed opening in the equalizing plug to establish an internal fluid flow passageway through the valve member to equalize the fluid pressure above and below the valve member.
- the longitudinal passageway extending through the actuating member further includes a flared portion adjacent the upper surface of the strike plate.
- the upper surface of the valve member further includes a radial lip for receiving the strike plate and forming a groove for receiving the spring.
- the spring is a compression spring.
- the compression spring is a wave spring.
- the compression spring is a Belleville spring.
- Figure 1 is an elevational side view, partially in cross-section, showing a subsurface safety valve of the present invention.
- Figure 2 is an elevational side view, in cross-section, showing an equalizing mechanism of the present invention installed in the flapper mechanism of the subsurface safety valve shown in Figure 1, with both the flapper mechanism and the equalizing mechanism in closed positions.
- Figure 3 is a fragmentary elevational view similar to Figure 2, showing an equalizing mechanism of the present invention installed in the flapper mechanism of the subsurface safety valve shown in Figure 1, with both the flapper mechanism and the equalizing mechanism in closed positions.
- Figure 4 is an exploded elevational view showing the relationship between an equalizing plug of the present invention and a strike plate of the present invention.
- Figure 5 is a view similar to Figure 3, with the flapper mechanism still in a closed position, except that a flow tube has now moved downwardly to displace the equalizing mechanism of the present invention into an equalizing position.
- Figure 6 is a fragmentary elevational view showing the flapper mechanism of the present invention in an open position and the equalizing mechanism of the present invention in its closed position.
- the subsurface safety valve 10 of this specific embodiment is comprised of a generally tubular body 12 with a longitudinal bore 14 that extends therethrough.
- Each end of the body 12 includes mechanisms, such as threads 16, for interconnection with a pipe string (not shown) suspended within a wellbore (not shown).
- a sleeve member 18, usually referred to as a flow tube, is disposed within the bore 14 and is adapted for axial movement therein.
- the flow tube 18 includes a spring 20 disposed therearound that acts upon a shoulder 22 on the flow tube 18 biasing the flow tube 18 away from a flapper mechanism 24.
- the present invention is not intended to be limited to any particular means for biasing the flow tube 18 away from the flapper 24.
- the valve 10 may utilize a balancing gas chamber (not shown), such as those disclosed in U.S. Patent Nos. 4,252,197 (Pringle), 4,660,646 (Blizzard), 4,976,317 (Leismer), and 5,310,004 (Leismer), all of which are commonly assigned hereto and incorporated herein by reference.
- a balancing gas chamber such as those disclosed in U.S. Patent Nos. 4,252,197 (Pringle), 4,660,646 (Blizzard), 4,976,317 (Leismer), and 5,310,004 (Leismer), all of which are commonly assigned hereto and incorporated herein by reference.
- the flapper mechanism 24 generally comprises a disc or flapper valve closure member 26 with an arm 28 on a peripheral edge thereof that is hingedly connected to an annular housing 30 mounted within the bore 14.
- the annular housing 30 includes a metallic annular sealing surface 32 cooperable with an annular sealing surface 34 on the flapper 26.
- the annular housing 30 may further include a secondary annular sealing surface 38 formed from an annular body of pliable material, which is cooperable with the annular sealing surface 34 on the flapper 26.
- the metallic sealing surface 32 is generally referred to as the "hard seat” and the pliable sealing surface 38 is generally referred to as the "soft seat”.
- a rod-piston system may be provided to open the flapper 26, and may be comprised of a piston 40 sealably mounted for reciprocal movement within a cylinder 42 located within the wall of the tubular body 12.
- a first end 41 ofthe piston 40 is in contact with hydraulic fluid (not shown) provided thereto from the earth's surface through a relatively small diameter control conduit 44.
- a second end 43 ofthe piston 40 is operatively connected, in any suitable manner, to the flow tube 18.
- the spring 20 forces the flow tube 18 upwardly away from the flapper 26.
- the flapper 26 is then rotated, and biased, into a closed position by action of a hinge spring (not shown) to permit the annular sealing surfaces 32, 34 and 38 to mate and thereby establish a fluid seal to prevent fluid flow into the flow tube 18.
- the present invention solves this difficulty in opening the flapper 26 by providing the flapper mechanism 24 with pressure equalizing mechanism, described below, to allow the pressure above and below the flapper 26 to equalize prior to the complete opening ofthe flapper 26, thereby reducing the force necessary to open the flapper 26.
- the flapper mechanism 24 is provided with an equalizing mechanism which includes: an equalizing plug 46; a bore 48 through the flapper 26 for receiving the plug 46; a circular strike plate 50 having an actuating member 52 extending downwardly from the strike plate into the plug bore and connected to the equalizing plug 46, the strike plate extending into the path of the flow tube 18 and transferring downward movement ofthe flow tube 18 to the plug 46 to thereby shift the plug 46 axially downwardly to open a passageway through the flapper 26 and permit the fluid pressure above and below the flapper 26 to equalize; and a spring 54 disposed between the strike plate 50 and the upper surface ofthe flapper 26 and adjacent the periphery 56 ofthe strike plate 50 for upwardly biasing (a) the strike plate 50 away from the flapper 26 and (b) the equalizing plug 46 within the bore 48.
- the upper surface 27 ofthe flapper 26 may be provided with a radial lip 84 for receiving the strike plate 50 and forming a groove 86 for receiving the spring 54.
- the spring 54 may be any suitable compression spring as known to those having ordinary skill in the art, such as a wave spring or a Belleville spring.
- the plug 46 is disposed for reciprocal movement within the plug bore 48. The plug 46 is held in a normally closed position by action ofthe spring 54 against the strike plate 50.
- the plug 46 includes an enlarged shoulder 58 on a first end thereof and an upper portion 60 on an opposite second end thereof. The upper portion 60 ofthe plug 46 is disposed below the upper surface 27 ofthe flapper 26.
- the enlarged shoulder 58 includes a metallic annular sealing surface 62 that cooperates with a metallic annular sealing surface 64 (or "hard seat”) on the flapper 26 about the plug bore 48.
- the bore 48 ofthe flapper 26 may also include a secondary annular sealing surface (or "soft seat”) (not shown) formed from an annular body of pliable material to cooperate with a mating secondary annular sealing surface (not shown) on the enlarged shoulder 58 ofthe plug 46.
- a soft seat is used to ensure sealing when operating in low pressure differential applications.
- the upper portion 60 ofthe plug 46 includes a generally longitudinal bore 66 extending from the upper surface 68 ofthe plug 46 and having a threaded portion 70.
- the upper portion 60 ofthe plug 46 further includes a generally longitudinal passageway 72 which extends from the bore 66 and is in fluid communication with one or more generally radially disposed openings 74 that exit the plug 46 at a location between the lower surface ofthe bore 66 and the sealing surface 62 on the shoulder 58 ofthe plug 46.
- the purpose ofthe bore 66, the passageway 72, and the openings 74 will be described below.
- the actuating member 52 which extends downwardly from the strike plate 50, includes a shank 76 having a threaded portion 78 for mating with the threaded portion 70 ofthe bore 66 in the upper portion 60 ofthe plug 46.
- a generally longitudinal passageway 80 extends from the lower surface 77 ofthe shank 76 through the actuating member 52 to the upper surface 51 ofthe strike plate 50.
- the passageway 80 cooperates with the longitudinal passageway 72 and the one or more radially disposed openings 74 in the plug 46 to establish an internal fluid flow passageway through the flapper 26 to equalize the fluid pressure above and below the flapper 26, as more fully explained elsewhere herein.
- the longitudinal passageway 80 may be provided with a flared portion 82 adjacent the upper surface 51 ofthe strike plate 50 to enhance the fluid flow rate through the flapper 26.
- the flow tube 18 When the flapper 26 is in a closed position, as shown in Figures 1-3, and it is desired to open the flapper 26, the flow tube 18 is forced towards the flapper 26 by the application of hydraulic fluid through the control conduit 44 (as has been described previously) or by electrical/mechanical action or simply mechanical action, depending upon the type of safety valve within which the present invention is included. With reference to Figure 3, as the flow tube 18 is moved downwardly, a lower portion ofthe flow tube 18 will come into contact with the upper peripheral surface 56 ofthe strike plate 50.
- the lower portion ofthe flow tube 18 is formed from material sufficiently hard to not be deformed, or galled, by contact with the strike plate 50, or the lower portion ofthe flow tube 18 can include a surface hard coating or can be formed as a separate piece joined thereto and formed from harder material than the other portions ofthe flow tube 18.
- the strike plate 50 As the strike plate 50 is pushed downwardly, it will shift the plug 46 axially downwardly so as to separate the annular sealing surfaces 62 and 64 and expose the one or more radially disposed openings 74.
- the relatively high pressure wellbore fluid below the flapper 26 then rapidly flows into the one or more radially disposed openings 74, through the longitudinal passageway 72 in the plug 46, through the longitudinal passageway 80 in the strike plate 50, and into the bore 14 above the flapper 26.
- the equalizing mechanism ofthe present invention prevents the initial relatively high velocity flow of fluids past the flapper 26 from damaging the annular sealing surfaces 32, 34, and 38.
- the flow tube 18 is forced against the flapper 26 with sufficient force to overcome the force exerted by the hinge spring (not shown), the force exerted by the spring 20, and the force exerted by the pressure in the tubing, and hold the flapper 26 in the open position, as shown in Figure 6, as long as the hydraulic pressure from the control conduit 44 is applied.
- the plug 46 When the flapper 26 is in the open position, the plug 46 is maintained by action ofthe spring 54 in its closed or sealed position. In this manner, excessive exposure ofthe sealing surfaces 62 and 64 to production fluids is prevented.
- the spring 20 causes the flow tube 18 to be moved away from the flapper 26, so that: (a) the flapper 26 rotates to a closed position and the sealing surfaces 32, 34 and 38 come into operative contact with each other to prevent fluid flow therepast; and (b) the flow tube 18 moves away from the strike plate 50 so that the plug 46 is upwardly biased into the plug bore 48 by the spring 54, the radially disposed openings 74 are closed, and the sealing surfaces 62 and 64 come into operative contact with each other to prevent fluid flow therepast.
- the equalizing plug 46 may be opened for a very brief time, but will return to the closed position as soon as there ceases to be contact between the strike plate 50 and the flow tube 18.
- the equalizing mechanism ofthe present invention may be installed within a curved flapper valve ofthe type disclosed in U.S. Pat. No. 4,926,945, commonly assigned hereto, which is incorporated herein by reference.
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Safety Valves (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU78361/98A AU7836198A (en) | 1997-06-10 | 1998-06-10 | Pressure equalizing safety valve for subterranean wells |
GB9928372A GB2343208B (en) | 1997-06-10 | 1998-06-10 | Pressure equalizing safety valve for subterranean wells |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US4917197P | 1997-06-10 | 1997-06-10 | |
US06/049,171 | 1997-06-10 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1998057029A1 true WO1998057029A1 (en) | 1998-12-17 |
Family
ID=21958403
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US1998/012121 WO1998057029A1 (en) | 1997-06-10 | 1998-06-10 | Pressure equalizing safety valve for subterranean wells |
Country Status (3)
Country | Link |
---|---|
AU (1) | AU7836198A (en) |
GB (1) | GB2343208B (en) |
WO (1) | WO1998057029A1 (en) |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2000008299A1 (en) * | 1998-08-06 | 2000-02-17 | Camco International, Inc. | Axial pressure equalizing valve for a well safety valve |
GB2345076A (en) * | 1998-12-22 | 2000-06-28 | Camco Int | Pilot operated pressure equalising mechanism for subsurface valve |
WO2003036019A1 (en) * | 2001-10-22 | 2003-05-01 | Baker Hughes Incorporated | Pressure equalizing plunger valve for downhole use |
US7204313B2 (en) * | 2005-01-07 | 2007-04-17 | Baker Hughes Incorporated | Equalizing flapper for high slam rate applications |
WO2009020711A2 (en) * | 2007-08-03 | 2009-02-12 | Baker Hughes Incorporated | Flapper operating system without a flow tube |
US8453729B2 (en) | 2009-04-02 | 2013-06-04 | Key Energy Services, Llc | Hydraulic setting assembly |
US8684096B2 (en) | 2009-04-02 | 2014-04-01 | Key Energy Services, Llc | Anchor assembly and method of installing anchors |
CN105156040A (en) * | 2015-07-23 | 2015-12-16 | 中国石油天然气集团公司 | Splash-proof joint of square drill rod |
US9303477B2 (en) | 2009-04-02 | 2016-04-05 | Michael J. Harris | Methods and apparatus for cementing wells |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU784461B2 (en) * | 2000-12-05 | 2006-04-06 | Baker Hughes Incorporated | Equalizing flapper for down hole safety valves |
Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2267501A1 (en) * | 1974-04-12 | 1975-11-07 | Erap | |
US4161219A (en) | 1978-02-27 | 1979-07-17 | Camco, Incorporated | Piston actuated well safety valve |
US4252197A (en) | 1979-04-05 | 1981-02-24 | Camco, Incorporated | Piston actuated well safety valve |
US4415036A (en) * | 1982-02-22 | 1983-11-15 | Baker Oil Tools, Inc. | Pressure equalizing flapper type safety valve for subterranean wells |
US4478286A (en) * | 1983-02-14 | 1984-10-23 | Baker Oil Tools, Inc. | Equalizing valve for subterranean wells |
US4660646A (en) | 1985-11-27 | 1987-04-28 | Camco, Incorporated | Failsafe gas closed safety valve |
US4976317A (en) | 1989-07-31 | 1990-12-11 | Camco International Inc. | Well tool hydrostatic release means |
US5310004A (en) | 1993-01-13 | 1994-05-10 | Camco International Inc. | Fail safe gas bias safety valve |
GB2292959A (en) * | 1994-09-09 | 1996-03-13 | Camco Int | Equalizing subsurface safety valve |
US5682921A (en) * | 1996-05-28 | 1997-11-04 | Baker Hughes Incorporated | Undulating transverse interface for curved flapper seal |
-
1998
- 1998-06-10 AU AU78361/98A patent/AU7836198A/en not_active Abandoned
- 1998-06-10 GB GB9928372A patent/GB2343208B/en not_active Expired - Fee Related
- 1998-06-10 WO PCT/US1998/012121 patent/WO1998057029A1/en active Application Filing
Patent Citations (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2267501A1 (en) * | 1974-04-12 | 1975-11-07 | Erap | |
US4161219A (en) | 1978-02-27 | 1979-07-17 | Camco, Incorporated | Piston actuated well safety valve |
US4161219B1 (en) | 1978-02-27 | 1984-02-28 | ||
US4252197A (en) | 1979-04-05 | 1981-02-24 | Camco, Incorporated | Piston actuated well safety valve |
US4415036A (en) * | 1982-02-22 | 1983-11-15 | Baker Oil Tools, Inc. | Pressure equalizing flapper type safety valve for subterranean wells |
US4478286A (en) * | 1983-02-14 | 1984-10-23 | Baker Oil Tools, Inc. | Equalizing valve for subterranean wells |
US4660646A (en) | 1985-11-27 | 1987-04-28 | Camco, Incorporated | Failsafe gas closed safety valve |
US4976317A (en) | 1989-07-31 | 1990-12-11 | Camco International Inc. | Well tool hydrostatic release means |
US5310004A (en) | 1993-01-13 | 1994-05-10 | Camco International Inc. | Fail safe gas bias safety valve |
GB2292959A (en) * | 1994-09-09 | 1996-03-13 | Camco Int | Equalizing subsurface safety valve |
US5682921A (en) * | 1996-05-28 | 1997-11-04 | Baker Hughes Incorporated | Undulating transverse interface for curved flapper seal |
Non-Patent Citations (2)
Title |
---|
HILL, BHAVSAR: "Development of a self-equalizing surface controlled subsurface safety valve for reliability and design simplification", OTC, no. 8199, 6 May 1996 (1996-05-06) - 9 May 1996 (1996-05-09), Houston, pages 471 - 478, XP002076968 * |
MASON: "Downhole high-pressure equalizing safety valves: a solution-variable labyrinth seals", OTC, no. 5576, 27 April 1987 (1987-04-27) - 30 April 1987 (1987-04-30), Houston, pages 217 - 227, XP002076969 * |
Cited By (22)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2000008299A1 (en) * | 1998-08-06 | 2000-02-17 | Camco International, Inc. | Axial pressure equalizing valve for a well safety valve |
US6283217B1 (en) | 1998-08-06 | 2001-09-04 | Schlumberger Technology Corp. | Axial equalizing valve |
GB2345076A (en) * | 1998-12-22 | 2000-06-28 | Camco Int | Pilot operated pressure equalising mechanism for subsurface valve |
GB2345076B (en) * | 1998-12-22 | 2001-06-20 | Camco Int | Pilot-operated pressure-equalizing mechanism for subsurface valve |
US6296061B1 (en) | 1998-12-22 | 2001-10-02 | Camco International Inc. | Pilot-operated pressure-equalizing mechanism for subsurface valve |
AU2002343520B2 (en) * | 2001-10-22 | 2008-01-31 | Baker Hughes Incorporated | Pressure equalizing plunger valve for downhole use |
WO2003036019A1 (en) * | 2001-10-22 | 2003-05-01 | Baker Hughes Incorporated | Pressure equalizing plunger valve for downhole use |
US6848509B2 (en) | 2001-10-22 | 2005-02-01 | Baker Hughes Incorporated | Pressure equalizing plunger valve for downhole use |
GB2396647B (en) * | 2001-10-22 | 2005-10-26 | Baker Hughes Inc | Pressure equalizing plunger valve for downhole use |
GB2396647A (en) * | 2001-10-22 | 2004-06-30 | Baker Hughes Inc | Pressure equalizing plunger valve for downhole use |
AU2006203927B2 (en) * | 2005-01-07 | 2011-06-02 | Baker Hughes Incorporated | Equalizing flapper for high slam rate applications |
GB2437019B (en) * | 2005-01-07 | 2010-09-29 | Baker Hughes Inc | Flapper Valve Assembly |
US7204313B2 (en) * | 2005-01-07 | 2007-04-17 | Baker Hughes Incorporated | Equalizing flapper for high slam rate applications |
AU2006203927C1 (en) * | 2005-01-07 | 2011-11-24 | Baker Hughes Incorporated | Equalizing flapper for high slam rate applications |
NO339851B1 (en) * | 2005-01-07 | 2017-02-06 | Baker Hughes Inc | Flap valve assembly |
WO2009020711A2 (en) * | 2007-08-03 | 2009-02-12 | Baker Hughes Incorporated | Flapper operating system without a flow tube |
WO2009020711A3 (en) * | 2007-08-03 | 2010-12-23 | Baker Hughes Incorporated | Flapper operating system without a flow tube |
US9163479B2 (en) | 2007-08-03 | 2015-10-20 | Baker Hughes Incorporated | Flapper operating system without a flow tube |
US8453729B2 (en) | 2009-04-02 | 2013-06-04 | Key Energy Services, Llc | Hydraulic setting assembly |
US8684096B2 (en) | 2009-04-02 | 2014-04-01 | Key Energy Services, Llc | Anchor assembly and method of installing anchors |
US9303477B2 (en) | 2009-04-02 | 2016-04-05 | Michael J. Harris | Methods and apparatus for cementing wells |
CN105156040A (en) * | 2015-07-23 | 2015-12-16 | 中国石油天然气集团公司 | Splash-proof joint of square drill rod |
Also Published As
Publication number | Publication date |
---|---|
AU7836198A (en) | 1998-12-30 |
GB2343208A (en) | 2000-05-03 |
GB9928372D0 (en) | 2000-01-26 |
GB2343208B (en) | 2002-02-20 |
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