CA2436924A1 - Stuffing box for progressing cavity pump drive - Google Patents

Stuffing box for progressing cavity pump drive Download PDF

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Publication number
CA2436924A1
CA2436924A1 CA002436924A CA2436924A CA2436924A1 CA 2436924 A1 CA2436924 A1 CA 2436924A1 CA 002436924 A CA002436924 A CA 002436924A CA 2436924 A CA2436924 A CA 2436924A CA 2436924 A1 CA2436924 A1 CA 2436924A1
Authority
CA
Canada
Prior art keywords
seal
stuffing box
shaft
pressurization
polished rod
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA002436924A
Other languages
French (fr)
Other versions
CA2436924C (en
Inventor
Vern Arthur Hult
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Oil Lift Technology Inc
Original Assignee
Oil Lift Technology Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from CA002397360A external-priority patent/CA2397360A1/en
Application filed by Oil Lift Technology Inc filed Critical Oil Lift Technology Inc
Priority to CA2711206A priority Critical patent/CA2711206C/en
Priority to CA2436924A priority patent/CA2436924C/en
Priority to CA002629278A priority patent/CA2629278C/en
Publication of CA2436924A1 publication Critical patent/CA2436924A1/en
Application granted granted Critical
Publication of CA2436924C publication Critical patent/CA2436924C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F04C15/0003—Sealing arrangements in rotary-piston machines or pumps
    • F04C15/0034—Sealing arrangements in rotary-piston machines or pumps for other than the working fluid, i.e. the sealing arrangements are not between working chambers of the machine
    • F04C15/0038—Shaft sealings specially adapted for rotary-piston machines or pumps
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/12—Methods or apparatus for controlling the flow of the obtained fluid to or in wells
    • E21B43/121—Lifting well fluids
    • E21B43/126—Adaptations of down-hole pump systems powered by drives outside the borehole, e.g. by a rotary or oscillating drive
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B33/00—Sealing or packing boreholes or wells
    • E21B33/02—Surface sealing or packing
    • E21B33/08—Wipers; Oil savers
    • E21B33/085—Rotatable packing means, e.g. rotating blow-out preventers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C13/00—Adaptations of machines or pumps for special use, e.g. for extremely high pressures
    • F04C13/008—Pumps for submersible use, i.e. down-hole pumping
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/10—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member
    • F04C2/107—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member with helical teeth
    • F04C2/1071—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member with helical teeth the inner and outer member having a different number of threads and one of the two being made of elastic materials, e.g. Moineau type

Abstract

Progressive cavity (PC) pump drive heads require a stuffing box to seal crude oil from leaking onto the ground where the polish rod passes from the crude oil passage in the wellhead to the drive head. Because crude oil typically contains fine sand particles, alignment between the stuffing box and the polished rod is imperfect, and PC drive heads run continuously, it is very difficult make stuffing boxes that last as long as desirable by oil production companies. By using a flexibly mounted standpipe in various configurations, around which is a bearing supported shaft carrying the seating means, long term durability of the stuffing box can be achieved. By using a pressurization system such that the pressure output exceeds the pressure at the wellhead, stuffing box seal life can be extended and external leakage from the stuffing box can be eliminated. A
double wall standpipe may be provided in some applications as part of the pressurization system. In some cases pressurization of the stuffing box is sufficiently advantageous that a floating standpipe is not economically warranted.

Claims (43)

1. A stuffing box for sealing around a polished rod in a well, comprising:
a housing;
a tubular shaft rotatably mounted in said housing concentrically receiving said polished rod;
a non-rotatable tubular standpipe concentrically received within said shaft and detachably secured to said housing;
a source of pressurization fluid;
an upper primary rotary seal in contact with well fluid on its upper side and pressurization fluid on its lower side disposed in the annulus between said standpipe and said shaft;
a lower pressurization rotary seal acting to hold pressurization fluid against the upper seal disposed in the annulus between said standpipe and said shaft; and said standpipe having fluid passages therein for communicating pressurization fluid from said housing to said annulus between said upper and said lower rotary seals.
2. A stuffing box as defined in claim 1, said upper primary rotary seal being removable upwardly through said shaft to facilitate servicing of said seal.
3. A stuffing box as defined in claim 1, said upper primary rotary seal and said lower pressurization rotary seal being removable upwardly through said shaft to facilitate servicing of said seals.
4. A stuffing box as defined in claim 1, said standpipe being removable upwardly through said shaft to facilitate inspection and replacement of said standpipe.
5. A stuffing box as defined in claim 1, said upper primary rotary seal and said lower pressurization rotary seal and said standpipe being removable upwardly through said shaft to facilitate servicing.
6. A stuffing box for sealing around a polished rod in a well, comprising:
a housing;
a tubular shaft rotatably mounted in said housing concentrically receiving said polished rod;
a non-rotatable tubular standpipe concentrically received within said shaft and detachably secured to said housing;
a source of pressurization fluid;
an upper primary rotary seal in contact with well fluid on its upper side and pressurization fluid on its lower side disposed in the annulus between said standpipe and said shaft;
a lower pressurization rotary seal acting to hold pressurization fluid against the upper seal disposed in the annulus between said standpipe and said shaft;
static seal means to seal well fluids between said polished rod and said shaft;
a drive cap secured to said shaft that can be removed to permit access to said static seal means and said upper and said lower rotary seals;
removable clamp means connecting said polished rod to said drive cap; and said standpipe having fluid passages therein for communicating pressurization fluid from said housing to said annulus between said upper and said lower rotary seals.
7. A stuffing box as defined in claim 6, said upper primary rotary seal being removable upwardly through said shaft to facilitate servicing of said seal.
8. A stuffing box as defined in claim 6, said upper primary rotary seal and said lower pressurization rotary seal being removable upwardly through said shaft to facilitate servicing of said seals.
9. A stuffing box as defined in claim 6, said standpipe being removable upwardly through said shaft to facilitate inspection and replacement of said standpipe.
10. A stuffing box as defined in claim 6, said upper primary rotary seal and said lower pressurization rotary seal and said standpipe being removable upwardly through said shaft to facilitate servicing.
11. As stuffing box as defined in claim 7, said upper primary rotary seal including packings, lip seals and combinations thereof.
12. A stuffing box as defined in claim 11, said lower pressurization rotary seal including packings, lip seals and combination thereof.
13. A stuffing box as defined in claim 12, said upper primary rotary seal and said lower pressurization seal being separated and preloaded by a spring.
14. A stuffing box as defined in claim 6, said static seal means including a static seal carrier sealed to the inside of said shaft and ring seals disposed between said polished rod and said static seal carrier.
15. A stuffing box for sealing around a polished rod ire a well, comprising:
a housing;
a tubular shaft rotatably mounted in said housing concentrically receiving said polished rod;
a non-rotatable tubular standpipe concentrically received within said shaft and detachably secured to said housing;
an upper primary rotary seal in contact with well fluid on its upper side and in communication with a leakage passage on its lower side disposed in the annulus between said standpipe and said shaft;

a lower secondary rotary seal in communication with a leakage passage on its upper side acting to impede the entry of well fluid into said housing disposed in the annulus between said standpipe and said shaft;
a leakage passage between said upper and lower seals to carry away well fluids that have leaked past said upper seal;
static seal means to seal well fluids between said polished rod and said shaft;
a drive cap secured to said shaft that can be removed to permit access to said static seal means and said upper and said lower rotary seals;
removable clamp means connecting said polished rod to said drive cap;
said upper primary rotary seal being comprised of a lip seal in first contact with well fluid and rotary packings as the backup seal after said lip seal fails;
and said lower secondary rotary seal including self lubricating packings, self lubricating lip seals and combinations thereof.
16. A stuffing box as defined in claim 15, said upper primary rotary seal being removable upwardly through said shaft to facilitate servicing of said seal.
17. A stuffing box as defined in claim 15, said upper primary rotary seal and said lower secondary rotary seal being removable upwardly through said shaft to facilitate servicing of said seals.
18. A stuffing box as defined in claim 15, said standpipe being removable upwardly through said shaft to facilitate inspection and replacement of said standpipe.
19. A stuffing box as defined in claim 15, said upper primary rotary seal and said lower pressurization rotary seal and said standpipe being removable upwardly through said shaft to facilitate servicing.
20. A stuffing box as defined in claim 15, said static seal means including a static seal carrier sealed to the inside of said shaft and ring seals disposed between said polished rod and said static seal carrier.
21. A stuffing box for sealing around a polished rod in a well, comprising:
a housing;
a tubular shaft rotatably mounted in said housing concentrically receiving said polished rod;
a non-rotatable tubular standpipe concentrically received within said shaft and detachably secured to said housing;
a source of pressurization fluid;
an upper primary rotary seal in contact with well fluid on its upper side and pressurization fluid on its lower side disposed in the annulus between said standpipe and said shaft;
a lower pressurization rotary seat acting to hold pressurization fluid against the upper seal disposed in the annulus between said housing and said shaft;
static seal means to seal well fluids between said polished rod and said shaft;
a drive cap secured to said shaft that can be removed to permit access to said static seal means and said upper rotary seals; and removable clamp means connecting said polished rod to said drive cap.
22. A stuffing box as defined in claim 21, said upper primary rotary seal being removable upwardly through said shaft to facilitate servicing of said seal.
23. A stuffing box as defined in claim 22, said standpipe being removable upwardly through said shaft to facilitate inspection and replacement of said standpipe.
24. As stuffing box as defined in claim 22, said upper primary rotary seal including packings, lip seals and combinations thereof.
25. A stuffing box as defined in claim 21, said lower pressurization rotary seal including packings, lip seals and combination thereof.
26. A stuffing box as defined in claim 24, said upper primary rotary seal preloaded by a spring.
27. A stuffing box as defined in claim 21, said static seal means including a static seal carrier sealed to the inside of said shaft and ring seals disposed between said polished rod and said static seal carrier.
28. A stuffing box for sealing around a polished rod in a well, comprising:
a tubular housing with an internal bore to concentrically receive said polished rod therethrough;
a tubular shaft bearingly mounted in said housings concentrically receiving said polished rod;
a hardened shaft extension projecting downward beyond the shaft support bearings, creating an annulus between said shaft extension and said housing;
a lower primary rotary seal disposed in the annulus between said shaft extension and said housing and in contact with well fluid on one side and pressurization fluid on its other side, said primary seal including braided packings, and braided packings with a lip seal below said packings;
an upper pressurization rotary seal disposed in the annulus between said shaft extension and said housing, acting to hold pressurization fluid against said primary seal, said pressurization seal including a lip seal, braided packings and combinations thereof;
static seal means to seal well fluids between said polished rod and said shaft;
a drive cap secured to said shaft that can be removed to permit access to said static seal means;
removable clamp means connecting said polished rod to said drive cap; and a source of pressurization fluid.
29. A stuffing box for sealing around a polished rod in a well, comprising:
a housing;
a tubular shaft rotatably mounted in said housing concentrically receiving said polished rod;

a primary rotary seal in contact with well fluid on one side and pressurization fluid on its other side;
a pressurization rotary seal acting to hold pressurization fluid against the primary seal;
static seal means to seal well fluids between said polished rod and said shaft;
a drive cap secured to said shaft that can be removed to permit access to said static seal means;
removable clamp means connecting said polished rod to said drive cap; and an intensifying cylinder assembly.
30. A stuffing box as defined in claim 29, said intensifying cylinder assembly comprising:
a piston with a large area exposed to well fluid pressure and a smaller area exposed to a fluid to be pressurized; and said fluid thus pressurized being made available to said stuffing box at a pressure greater than wellhead pressure.
31. A stuffing box as defined in claim 30, said intensifying cylinder assembly including an annular passage to receive said polished rod therethrough.
32. A stuffing box as defined in claim 31, said intensifying cylinder assembly including an internal passage for pressurized fluid to enter said stuffing box without need for external plumbing between said intensifier cylinder and said stuffing box.
33. A stuffing box as defined in claim 32, said intensifying cylinder assembly including an intensifier housing, an extension tube concentrically disposed around the polished rod and sealed to said housing and said piston, with intensified pressure acting on outside diameter of said extension tube.
34. A source of pressurization fluid for a stuffing box, comprising:
an intensifying cylinder assembly;

a piston with a large area exposed to well fluid pressure and a smaller area exposed to a fluid to be pressurized; and said fluid thus pressurized being made available to said stuffing box at a pressure greater than wellhead pressure.
35. A source of pressurization fluid for a stuffing box as defined in claim 34, said intensifying cylinder assembly including an annular passage to receive a polished rod therethrough.
36. A source of pressurization for a stuffing box as defined in claim 34, said intensifying cylinder assembly including an internal passage for pressurized fluid to enter said stuffing box without need for external plumbing between said intensifier cylinder and said stuffing box.
37. A source of pressurization fluid for a stuffing box as defined in claim 35, said intensifying cylinder assembly including an intensifier housing, an extension tube concentrically disposed around the polished rod and sealed to said housing and said piston, with intensified pressure acting on outside diameter of said extension tube.
38. A stuffing box for sealing around a polished rod in a well, comprising:
a non-rotating tubular shaft concentrically receiving said polished rod;
a rotating housing supported by bearings on said shaft;
a source of pressurization fluid;
an upper primary rotary seal in contact with well fluid on its upper side and pressurization fluid on its lower side disposed in the annulus between said housing and said shaft;
a lower pressurization rotary seal acting to hold pressurization fluid against the upper seal disposed in the annulus between said housing and said shaft;
static seal means to seal well fluids between said polished rod and said housing;

a drive cap secured to said housing that can be removed to permit access to said static seal means and said upper rotary seals;
removable clamp means connecting said polished rod to said drive cap; and said shaft having fluid passages therein for communicating pressurization fluid from said shaft to said annulus between said upper and said lower rotary seals.
39. A stuffing box as defined in claim 38, said upper primary rotary seal being removable upwardly through said housing to facilitate servicing of said seal.
40. As stuffing box as defined in claim 39, said upper primary rotary seal including packings, lip seals and combinations thereof.
41. A stuffing box as defined in claim 40, said lower pressurization rotary seal including packings, lip seals and combinations thereof.
42. A stuffing box as defined in claim 40, said upper primary rotary seal being preloaded by a spring.
43. A stuffing box as defined in claim 38, said static seal means including a static seal carrier sealed to the inside of said housing and ring seals disposed between said polished rod and said static seal carrier.
CA2436924A 2002-08-09 2003-08-11 Stuffing box for progressing cavity pump drive Expired - Lifetime CA2436924C (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CA2711206A CA2711206C (en) 2002-08-09 2003-08-11 Stuffing box for progressing cavity pump drive
CA2436924A CA2436924C (en) 2002-08-09 2003-08-11 Stuffing box for progressing cavity pump drive
CA002629278A CA2629278C (en) 2002-08-09 2003-08-11 Stuffing box for progressing cavity pump drive

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CA002397360A CA2397360A1 (en) 2002-08-09 2002-08-09 Stuffing box for progressing cavity pump drive
CA2,397,360 2002-08-09
CA2436924A CA2436924C (en) 2002-08-09 2003-08-11 Stuffing box for progressing cavity pump drive

Related Child Applications (2)

Application Number Title Priority Date Filing Date
CA002629278A Division CA2629278C (en) 2002-08-09 2003-08-11 Stuffing box for progressing cavity pump drive
CA2711206A Division CA2711206C (en) 2002-08-09 2003-08-11 Stuffing box for progressing cavity pump drive

Publications (2)

Publication Number Publication Date
CA2436924A1 true CA2436924A1 (en) 2004-02-09
CA2436924C CA2436924C (en) 2010-09-21

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Family Applications (3)

Application Number Title Priority Date Filing Date
CA2711206A Expired - Lifetime CA2711206C (en) 2002-08-09 2003-08-11 Stuffing box for progressing cavity pump drive
CA002629278A Expired - Lifetime CA2629278C (en) 2002-08-09 2003-08-11 Stuffing box for progressing cavity pump drive
CA2436924A Expired - Lifetime CA2436924C (en) 2002-08-09 2003-08-11 Stuffing box for progressing cavity pump drive

Family Applications Before (2)

Application Number Title Priority Date Filing Date
CA2711206A Expired - Lifetime CA2711206C (en) 2002-08-09 2003-08-11 Stuffing box for progressing cavity pump drive
CA002629278A Expired - Lifetime CA2629278C (en) 2002-08-09 2003-08-11 Stuffing box for progressing cavity pump drive

Country Status (1)

Country Link
CA (3) CA2711206C (en)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2417744A (en) * 2004-09-03 2006-03-08 Weatherford Lamb Rotating stuffing box with split standpipe
US7673674B2 (en) 2006-01-31 2010-03-09 Stream-Flo Industries Ltd. Polish rod clamping device
US7931078B2 (en) 2008-02-22 2011-04-26 Scope Production Developments Ltd. Stuffing box apparatus
CN102134976A (en) * 2011-03-04 2011-07-27 中南大学 Tunnel drilling hydraulic power reverse-circulation dual-walled drilling tool
WO2014015435A1 (en) * 2012-07-24 2014-01-30 Oil Lift Technology Inc. Drive head safety guard
EP3135860A3 (en) * 2015-08-05 2017-05-24 Weatherford Technology Holdings, LLC Pumping system and method
US9903187B2 (en) 2015-08-05 2018-02-27 Weatherford Technology Holdings, Llc Hydraulic pumping system with enhanced piston rod sealing
US10167865B2 (en) 2015-08-05 2019-01-01 Weatherford Technology Holdings, Llc Hydraulic pumping system with enhanced piston rod sealing
US10344573B2 (en) 2016-03-08 2019-07-09 Weatherford Technology Holdings, Llc Position sensing for wellsite pumping unit
CN110005811A (en) * 2019-04-24 2019-07-12 东台船用配件有限公司 Stern tube shaft is servo-actuated combination sealing arrangement

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
UA109682C2 (en) 2010-12-09 2015-09-25 PUMP PUMP PLACED PIPE
USD687125S1 (en) 2011-08-19 2013-07-30 S.P.M. Flow Control, Inc. Fluid end
CN106150953B (en) 2012-02-01 2018-10-19 S.P.M.流量控制股份有限公司 Pump fluid end with integrated web part
USD679292S1 (en) 2012-04-27 2013-04-02 S.P.M. Flow Control, Inc. Center portion of fluid cylinder for pump
USD706832S1 (en) 2012-06-15 2014-06-10 S.P.M. Flow Control, Inc. Fluid cylinder for a pump
USD705817S1 (en) 2012-06-21 2014-05-27 S.P.M. Flow Control, Inc. Center portion of a fluid cylinder for a pump
CN106958430B (en) * 2016-01-08 2019-10-18 于立成 Rod beam-pumping unit well head sealing apparatus
CN109441392B (en) * 2018-12-13 2020-10-16 东营利达石油工程技术服务有限公司 Packing box for wellhead of oil pumping unit
CN109882109B (en) * 2019-03-11 2021-05-14 中国石油天然气股份有限公司 Limit deviation-adjusting blowout prevention mechanism and blowout prevention box using same
AU2020472899A1 (en) * 2020-12-23 2022-07-07 Oil Lift Technology Inc. Stuffing box with pressurized fluid chamber and related methods

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2417744A (en) * 2004-09-03 2006-03-08 Weatherford Lamb Rotating stuffing box with split standpipe
US7337851B2 (en) 2004-09-03 2008-03-04 Weatherford/Lamb, Inc. Rotating stuffing box with split standpipe
GB2417744B (en) * 2004-09-03 2009-10-28 Weatherford Lamb Rotating stuffing box with split standpipe
US7673674B2 (en) 2006-01-31 2010-03-09 Stream-Flo Industries Ltd. Polish rod clamping device
US7931078B2 (en) 2008-02-22 2011-04-26 Scope Production Developments Ltd. Stuffing box apparatus
CN102134976A (en) * 2011-03-04 2011-07-27 中南大学 Tunnel drilling hydraulic power reverse-circulation dual-walled drilling tool
WO2014015435A1 (en) * 2012-07-24 2014-01-30 Oil Lift Technology Inc. Drive head safety guard
US9903187B2 (en) 2015-08-05 2018-02-27 Weatherford Technology Holdings, Llc Hydraulic pumping system with enhanced piston rod sealing
EP3135860A3 (en) * 2015-08-05 2017-05-24 Weatherford Technology Holdings, LLC Pumping system and method
US10167865B2 (en) 2015-08-05 2019-01-01 Weatherford Technology Holdings, Llc Hydraulic pumping system with enhanced piston rod sealing
US10619464B2 (en) 2015-08-05 2020-04-14 Weatherford Technology Holdings, Llc Hydraulic pumping system with detection of fluid in gas volume
US10760388B2 (en) 2015-08-05 2020-09-01 Weatherford Technology Holdings, Llc Slant mounted hydraulic pumping system
US11098708B2 (en) 2015-08-05 2021-08-24 Weatherford Technology Holdings, Llc Hydraulic pumping system with piston displacement sensing and control
US10344573B2 (en) 2016-03-08 2019-07-09 Weatherford Technology Holdings, Llc Position sensing for wellsite pumping unit
CN110005811A (en) * 2019-04-24 2019-07-12 东台船用配件有限公司 Stern tube shaft is servo-actuated combination sealing arrangement
CN110005811B (en) * 2019-04-24 2024-03-12 东台船用配件有限公司 Tail shaft follow-up combined sealing device

Also Published As

Publication number Publication date
CA2629278C (en) 2009-05-05
CA2711206A1 (en) 2004-02-09
CA2711206C (en) 2012-09-11
CA2629278A1 (en) 2004-02-09
CA2436924C (en) 2010-09-21

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Effective date: 20230811