US20120168149A1 - Progressive Cavity Pump Rod Guide - Google Patents
Progressive Cavity Pump Rod Guide Download PDFInfo
- Publication number
- US20120168149A1 US20120168149A1 US12/984,138 US98413811A US2012168149A1 US 20120168149 A1 US20120168149 A1 US 20120168149A1 US 98413811 A US98413811 A US 98413811A US 2012168149 A1 US2012168149 A1 US 2012168149A1
- Authority
- US
- United States
- Prior art keywords
- rod guide
- spinner
- rod
- receiver
- molded
- 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.)
- Abandoned
Links
- 230000000750 progressive effect Effects 0.000 title description 8
- 239000000463 material Substances 0.000 claims abstract description 8
- 239000004734 Polyphenylene sulfide Substances 0.000 claims description 3
- 239000011521 glass Substances 0.000 claims description 3
- 238000000465 moulding Methods 0.000 claims description 3
- 229920000642 polymer Polymers 0.000 claims description 3
- 229920000069 polyphenylene sulfide Polymers 0.000 claims description 3
- 239000004952 Polyamide Substances 0.000 claims description 2
- 150000001875 compounds Chemical class 0.000 claims description 2
- 229920001577 copolymer Polymers 0.000 claims description 2
- 239000011152 fibreglass Substances 0.000 claims description 2
- 238000005304 joining Methods 0.000 claims description 2
- 229920002647 polyamide Polymers 0.000 claims description 2
- 229920005989 resin Polymers 0.000 claims description 2
- 239000011347 resin Substances 0.000 claims description 2
- 239000012530 fluid Substances 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 229920006104 Amodel® Polymers 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
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
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/10—Wear protectors; Centralising devices, e.g. stabilisers
- E21B17/1057—Centralising devices with rollers or with a relatively rotating sleeve
- E21B17/1064—Pipes or rods with a relatively rotating sleeve
-
- 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
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/10—Wear protectors; Centralising devices, e.g. stabilisers
- E21B17/1071—Wear protectors; Centralising devices, e.g. stabilisers specially adapted for pump rods, e.g. sucker rods
Definitions
- the present invention relates to the field of rod guides suitable for guiding a sucker rod within production tubing of an oil or gas well. More particularly, the invention relates to a rod guide assembly for guiding a rotary sucker rod which powers a progressive cavity pump in a well.
- a progressive cavity pump is also used to pump water from a gas well, and for other operations. These pumps are often used because of their ability to pump viscous fluids and fluids containing significant amounts of solids.
- the sucker rod string is positioned within well tubing of circular cross section and the rod string is rotated by a mechanism at the well head. By this operation, crude oil is pumped to the surface and recovered.
- the sucker rod string warps so that portions of the rotating string rub against the well tubing.
- string deformation causes rubbing action at a localized area of the tubing rather than the entire inner circumference. This leads to local wear of the tubing and rod and is generally undesirable. Such rubbing may be due to a crooked tubing or to deliberate bends in the tubing.
- rod guides have been positioned on the string at spaced-apart intervals along the string.
- These types of rod guides commonly comprise a circular center through which the string passes and a vaned outer body having a maximum diameter greater than that of the rod but smaller than the inside diameter of the tubing within which it is located.
- the outer diametric cross section defines arc portions which lie on a common circle centered on a central axis of the hollow center.
- the function of the rod guide is to contact the tubing to prevent direct contact between the string and tubing. As the rod guide contacts the tubing, the guide rotates with the string and thus rubs against the stationary tubing. The rubbing of the rotating rod against the stationary tubing damages the tubing, thereby reducing its life.
- rod guides have been devised for guiding a sucker rod within production tubing.
- a rod guide that is capable of rotation with respect to the rod, and which does not rotate with the rod when the rod guide is in contact with the well tubing, has been shown to reduce tubing wear and thereby extend tubing lifetime.
- Many rod guides are intended for use with a reciprocating sucker rod, and other rod guides are primarily intended for use with a rotating sucker rod.
- Some guides have utility for either a reciprocating rod or a rotating rod, although design considerations generally dictate that a sucker rod guide be primarily intended for one application or the other, but not both.
- PC progressive cavity
- rod guides In order to reduce friction wear between the vanes of the rod guide and the inside surface of the well bore tubing, such types of rod guides typically rotate relative to the sucker rod.
- the body of the guide commonly includes a gap or an opening into which the sucker rod is inserted. This action of mounting the rod guide weakens the body of the guide, and presents a region of the rod guide which can trap cuttings and other solids, which ultimately degrades the performance of the pump system as a whole and reduces the expected lifetime of the rod guide.
- the present invention comprises a rod guide receiver molded directly onto the sucker rod and a rod guide molded directly onto the rod guide receiver, the rod guide having a plurality of blades or fins molded as an integral part of a guide body that is free to turn about the rod guide receiver.
- the rod guide receiver serves in the manner of a bearing race, having a pair of opposing stops to retain the guide subsequently molded thereon.
- the rod guide may also be referred to herein as a spinner or a centralizing sleeve.
- the rod guide receiver and the rod guide are both formed of polymeric materials, but of materials different from one another so that the rod guide is free to rotate about the rod guide receiver. Further, the vanes of the rod guide are formed in a zig-zag pattern to enhance the strength and effectiveness of the vanes in bearing against the inside surface of the well tubing.
- FIG. 1 is a side view of a portion of well tubing in section with a portion of sucker rod with a rod guide receiver and rod guide spinner of the present invention.
- FIG. 2 is a side section view of a rod guide receiver and rod guide spinner of the present invention.
- FIG. 3 is section view of the combination receiver and rod guide spinner, taken along section lines 3 - 3 of FIG. 2 .
- FIG. 1 illustrates a presently preferred embodiment of a rod guide receiver and rod guide spinner combination of the present invention.
- Well tubing 10 extends from a wellhead (not shown) down to a region below a progressive cavity pump 12 . From the wellhead to the pump 12 may be many thousands of feet, and a sucker rod 14 extends this entire distance. Typically, the sucker rod 14 is made up of standard length segments and these segments are coupled together to form the desired total length.
- a plurality of rod guide assemblies are mounted to the sucker rod 14 at spaced apart intervals.
- One such rod guide assembly 16 is illustrated in FIG. 1 for descriptive purposes.
- the sucker rod 14 and the rod guide assembly 16 both typically come in a variety of sizes and diameters to accommodate different operating conditions.
- the rod guide assembly 16 is arranged to fit within an inside diameter 18 of the well tubing 10 .
- the progressive cavity pump 12 is coupled to the bottom end of the sucker rod 14 and is rotated by the sucker rod.
- FIGS. 2 and 3 show more details of the rotating rod guide of the present invention.
- the rod guide assembly 16 comprises two parts.
- a rod guide receiver 22 is molded onto the sucker rod 14 .
- the receiver 22 is preferably formed of a fiberglass reinforced polyphenylene sulfide compound, such as for example RYTONTM (PPS or R) or a synthetic molding resin containing polymers and copolymers of polyamides and their derivatives such as for example AMODEL® (PPAU or AF), that provides outstanding chemical resistance and mechanical properties even at elevated temperatures.
- RYTONTM is a trademark of Chevron Phillips Chemical Company
- AMODEL® is a registered trademark of Solvay Advanced Polymers, L.L.C.
- the receiver 22 includes an upper stop 24 , a lower stop 26 , and cylindrical body 28 joining the upper and lower stops. The upper and lower stops are tapered at either end away from the cylindrical body to streamline the flow of fluids by the rod guide assembly.
- a spinner 30 is molded onto the receiver 22 .
- the spinner 30 is preferably formed of AMODEL® (PPAU or AF) that is non-glass filled.
- Non-glass PPAU material is known in the industry but is typically used in plastic coated tubing applications.
- the dissimilarity of the materials of the receiver 22 and the spinner 30 allows the spinner 30 to rotate freely around the receiver against the cylindrical body 28 .
- a razor sharp blade is used to cut the length of the spinner before it is cooled. This step in the manufacturing process distracts the memory of the spinner material long enough that it cannot continue to cool and shrink, thereby binding on the receiver.
- the rod guide spinner 30 is molded directly onto the cylindrical body 28 of the receiver 22 , the manufacturing process results in a gap 32 between the rod guide spinner 30 and the cylindrical body. This allows the spinner to turn freely relative to the receiver.
- the spinner preferably comprises four vanes 34 , although three vanes may be used, if desired. Four vanes provides superior centering capability for the assembly, but this also reduces the area available for fluid flow between the assembly 16 and the inside diameter 18 of the well tubing. This drawback may be somewhat alleviated by making the vanes 34 narrower but this in turn reduces the mechanical strength of the vanes to shear stress as the sucker rod rotates.
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
A rod guide receiver is molded directly onto the sucker rod and a rod guide or spinner is then molded directly onto the rod guide receiver, the spinner having a plurality of blades or fins molded as an integral part of a spinner body that is free to turn about the rod guide receiver. The rod guide receiver serves in the manner of a bearing race, having a pair of opposing stops to retain the spinner subsequently molded thereon. The spinner may also be referred to herein as a centralizing sleeve. The rod guide receiver and the spinner are both formed of polymeric materials, but of materials different from one another so that the rod guide is free to rotate about the rod guide receiver. Further, the vanes of the rod guide are formed in a zig-zag pattern to enhance the strength and effectiveness of the vanes in bearing against the inside surface of the well tubing.
Description
- The present invention relates to the field of rod guides suitable for guiding a sucker rod within production tubing of an oil or gas well. More particularly, the invention relates to a rod guide assembly for guiding a rotary sucker rod which powers a progressive cavity pump in a well.
- In the oil and gas industry, primary and secondary recovery operations frequently use a rotating sucker rod string to operate a downhole rotary pump such as a progressive cavity pump. A progressive cavity pump is also used to pump water from a gas well, and for other operations. These pumps are often used because of their ability to pump viscous fluids and fluids containing significant amounts of solids. The sucker rod string is positioned within well tubing of circular cross section and the rod string is rotated by a mechanism at the well head. By this operation, crude oil is pumped to the surface and recovered.
- During these types of operation, the sucker rod string warps so that portions of the rotating string rub against the well tubing. Typically, string deformation causes rubbing action at a localized area of the tubing rather than the entire inner circumference. This leads to local wear of the tubing and rod and is generally undesirable. Such rubbing may be due to a crooked tubing or to deliberate bends in the tubing.
- To alleviate this wearing problem, rod guides have been positioned on the string at spaced-apart intervals along the string. These types of rod guides commonly comprise a circular center through which the string passes and a vaned outer body having a maximum diameter greater than that of the rod but smaller than the inside diameter of the tubing within which it is located. The outer diametric cross section defines arc portions which lie on a common circle centered on a central axis of the hollow center. The function of the rod guide is to contact the tubing to prevent direct contact between the string and tubing. As the rod guide contacts the tubing, the guide rotates with the string and thus rubs against the stationary tubing. The rubbing of the rotating rod against the stationary tubing damages the tubing, thereby reducing its life.
- Various types of rod guides have been devised for guiding a sucker rod within production tubing. A rod guide that is capable of rotation with respect to the rod, and which does not rotate with the rod when the rod guide is in contact with the well tubing, has been shown to reduce tubing wear and thereby extend tubing lifetime. Many rod guides are intended for use with a reciprocating sucker rod, and other rod guides are primarily intended for use with a rotating sucker rod. Some guides have utility for either a reciprocating rod or a rotating rod, although design considerations generally dictate that a sucker rod guide be primarily intended for one application or the other, but not both.
- As previously alluded to, compared to commonly used beam pumps which are powered by a reciprocating sucker rod, progressive cavity (PC) pumps are generally able to deal with a high concentration of sand or other particulate in the recovered fluid. In order to reduce friction wear between the vanes of the rod guide and the inside surface of the well bore tubing, such types of rod guides typically rotate relative to the sucker rod. To mount the rod guide to the sucker rod, the body of the guide commonly includes a gap or an opening into which the sucker rod is inserted. This action of mounting the rod guide weakens the body of the guide, and presents a region of the rod guide which can trap cuttings and other solids, which ultimately degrades the performance of the pump system as a whole and reduces the expected lifetime of the rod guide.
- The disadvantages of the prior art are overcome by the present invention, and an improved rod guide particularly suited for a progressive cavity pump is hereinafter disclosed.
- The present invention comprises a rod guide receiver molded directly onto the sucker rod and a rod guide molded directly onto the rod guide receiver, the rod guide having a plurality of blades or fins molded as an integral part of a guide body that is free to turn about the rod guide receiver. The rod guide receiver serves in the manner of a bearing race, having a pair of opposing stops to retain the guide subsequently molded thereon. The rod guide may also be referred to herein as a spinner or a centralizing sleeve. The rod guide receiver and the rod guide are both formed of polymeric materials, but of materials different from one another so that the rod guide is free to rotate about the rod guide receiver. Further, the vanes of the rod guide are formed in a zig-zag pattern to enhance the strength and effectiveness of the vanes in bearing against the inside surface of the well tubing.
- These and other features of the present invention will be readily apparent to those of skill in the art when they study the following detailed description in conjunction with the accompanying drawings.
- So that the manner in which the above recited features, advantages and objects of the present invention are attained and can be understood in detail, more particular description of the invention, briefly summarized above, may be had by reference to embodiments thereof which are illustrated in the appended drawings.
-
FIG. 1 is a side view of a portion of well tubing in section with a portion of sucker rod with a rod guide receiver and rod guide spinner of the present invention. -
FIG. 2 is a side section view of a rod guide receiver and rod guide spinner of the present invention. -
FIG. 3 is section view of the combination receiver and rod guide spinner, taken along section lines 3-3 ofFIG. 2 . -
FIG. 1 illustrates a presently preferred embodiment of a rod guide receiver and rod guide spinner combination of the present invention. Welltubing 10 extends from a wellhead (not shown) down to a region below aprogressive cavity pump 12. From the wellhead to thepump 12 may be many thousands of feet, and asucker rod 14 extends this entire distance. Typically, thesucker rod 14 is made up of standard length segments and these segments are coupled together to form the desired total length. - A plurality of rod guide assemblies are mounted to the
sucker rod 14 at spaced apart intervals. One suchrod guide assembly 16 is illustrated inFIG. 1 for descriptive purposes. Thesucker rod 14 and therod guide assembly 16 both typically come in a variety of sizes and diameters to accommodate different operating conditions. Therod guide assembly 16 is arranged to fit within aninside diameter 18 of thewell tubing 10. Theprogressive cavity pump 12 is coupled to the bottom end of thesucker rod 14 and is rotated by the sucker rod. -
FIGS. 2 and 3 show more details of the rotating rod guide of the present invention. Therod guide assembly 16 comprises two parts. First, arod guide receiver 22 is molded onto thesucker rod 14. Thereceiver 22 is preferably formed of a fiberglass reinforced polyphenylene sulfide compound, such as for example RYTON™ (PPS or R) or a synthetic molding resin containing polymers and copolymers of polyamides and their derivatives such as for example AMODEL® (PPAU or AF), that provides outstanding chemical resistance and mechanical properties even at elevated temperatures. RYTON™ is a trademark of Chevron Phillips Chemical Company and AMODEL® is a registered trademark of Solvay Advanced Polymers, L.L.C. Thereceiver 22 includes anupper stop 24, alower stop 26, andcylindrical body 28 joining the upper and lower stops. The upper and lower stops are tapered at either end away from the cylindrical body to streamline the flow of fluids by the rod guide assembly. - Second, once the receiver is molded onto the sucker rod and cured, a
spinner 30 is molded onto thereceiver 22. Thespinner 30 is preferably formed of AMODEL® (PPAU or AF) that is non-glass filled. Non-glass PPAU material is known in the industry but is typically used in plastic coated tubing applications. The dissimilarity of the materials of thereceiver 22 and thespinner 30 allows thespinner 30 to rotate freely around the receiver against thecylindrical body 28. Also, once the spinner has been molded onto thereceiver 22, a razor sharp blade is used to cut the length of the spinner before it is cooled. This step in the manufacturing process distracts the memory of the spinner material long enough that it cannot continue to cool and shrink, thereby binding on the receiver. - As shown in
FIG. 3 , although therod guide spinner 30 is molded directly onto thecylindrical body 28 of thereceiver 22, the manufacturing process results in agap 32 between therod guide spinner 30 and the cylindrical body. This allows the spinner to turn freely relative to the receiver. Also note that the spinner preferably comprises fourvanes 34, although three vanes may be used, if desired. Four vanes provides superior centering capability for the assembly, but this also reduces the area available for fluid flow between theassembly 16 and theinside diameter 18 of the well tubing. This drawback may be somewhat alleviated by making thevanes 34 narrower but this in turn reduces the mechanical strength of the vanes to shear stress as the sucker rod rotates. - This problem is overcome by forming the vanes in a zigzag pattern along a line parallel to the axis of the sucker rod. Once
such vane 34′ is illustrated inFIG. 1 . By molding at least twobends 36 into each vane, the vane is made more resistant to shear stress, much as a peaked roof can hold a greater load than a flat roof. - The principles, preferred embodiment and mode of operation of the present invention have been described in the foregoing specification. This invention is not to be construed as limited to the particular forms disclosed, since these are regarded as illustrative rather than restrictive. Moreover, variations and changes may be made by those skilled in the art without departing from the spirit of the invention.
Claims (4)
1. A rod guide assembly on a sucker rod having an axis, the assembly comprising:
a. a rod guide receiver molded to the sucker rod along an axis, the receiver having an upper stop and a lower stop and a cylindrical body joining the upper and lower stops; and
b. a rod guide spinner molded onto the rod guide receiver, the receiver and spinner defining a gap therebetween, and the spinner having a body with plurality of vanes extending radially outwardly from the spinner body.
2. The rod guide assembly of claim 1 , wherein the receiver and the spinner are molded of dissimilar materials.
3. The rod guide assembly of claim 1 , wherein the receiver is formed of a fiberglass reinforced polyphenylene sulfide compound and the spinner is formed of non-glass filled synthetic molding resin containing polymers and copolymers of polyamides.
4. The rod guide assembly of claim 1 , wherein the vanes define a zigzag pattern along a line parallel to the axis of the sucker rod.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/984,138 US20120168149A1 (en) | 2011-01-04 | 2011-01-04 | Progressive Cavity Pump Rod Guide |
CA2743691A CA2743691A1 (en) | 2011-01-04 | 2011-06-17 | Progressive cavity pump rod guide |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/984,138 US20120168149A1 (en) | 2011-01-04 | 2011-01-04 | Progressive Cavity Pump Rod Guide |
Publications (1)
Publication Number | Publication Date |
---|---|
US20120168149A1 true US20120168149A1 (en) | 2012-07-05 |
Family
ID=46379725
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/984,138 Abandoned US20120168149A1 (en) | 2011-01-04 | 2011-01-04 | Progressive Cavity Pump Rod Guide |
Country Status (2)
Country | Link |
---|---|
US (1) | US20120168149A1 (en) |
CA (1) | CA2743691A1 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20130098601A1 (en) * | 2011-10-25 | 2013-04-25 | Matias Pereyra | Sucker Rod Guide |
USD903723S1 (en) * | 2018-04-09 | 2020-12-01 | Cobalt Extreme Pty Ltd | Rod coupler |
USD910722S1 (en) * | 2018-09-10 | 2021-02-16 | Cobalt Extreme Pty Ltd | Rod coupler |
US11976521B2 (en) | 2019-08-01 | 2024-05-07 | Chevron U.S.A. Inc. | High speed rotor dynamics centralizer |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105863522B (en) * | 2015-01-19 | 2018-02-23 | 深圳市百勤石油技术有限公司 | A kind of self-lubricating bush formula spiral centering device |
CN110500047B (en) * | 2019-09-20 | 2020-12-22 | 于国江 | Sucker rod centralizer for oil field rod pumped well |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5740862A (en) * | 1995-01-17 | 1998-04-21 | Sable; Donald E. | Rod guide assembly |
US20080164019A1 (en) * | 2006-12-20 | 2008-07-10 | Tesco Corporation | Well string centralizer and method of forming |
US20090260802A1 (en) * | 2008-04-16 | 2009-10-22 | Hugo Ernst | Centralizer for tubular elements |
-
2011
- 2011-01-04 US US12/984,138 patent/US20120168149A1/en not_active Abandoned
- 2011-06-17 CA CA2743691A patent/CA2743691A1/en not_active Abandoned
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5740862A (en) * | 1995-01-17 | 1998-04-21 | Sable; Donald E. | Rod guide assembly |
US20080164019A1 (en) * | 2006-12-20 | 2008-07-10 | Tesco Corporation | Well string centralizer and method of forming |
US20090260802A1 (en) * | 2008-04-16 | 2009-10-22 | Hugo Ernst | Centralizer for tubular elements |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20130098601A1 (en) * | 2011-10-25 | 2013-04-25 | Matias Pereyra | Sucker Rod Guide |
US9010418B2 (en) * | 2011-10-25 | 2015-04-21 | Tenaris Connections Limited | Sucker rod guide |
US9926754B2 (en) | 2011-10-25 | 2018-03-27 | Tenaris Connections B.V. | Sucker rod guide |
USD903723S1 (en) * | 2018-04-09 | 2020-12-01 | Cobalt Extreme Pty Ltd | Rod coupler |
USD910722S1 (en) * | 2018-09-10 | 2021-02-16 | Cobalt Extreme Pty Ltd | Rod coupler |
US11976521B2 (en) | 2019-08-01 | 2024-05-07 | Chevron U.S.A. Inc. | High speed rotor dynamics centralizer |
Also Published As
Publication number | Publication date |
---|---|
CA2743691A1 (en) | 2012-07-04 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: WEATHERFORD ARTIFICIAL LIFT SYSTEMS, INC., TEXAS Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:KALTWASSER, DARYL;REEL/FRAME:028158/0413 Effective date: 20120322 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |