CN104295244A - Combined antiseptic and wear-resistant sucker rod - Google Patents
Combined antiseptic and wear-resistant sucker rod Download PDFInfo
- Publication number
- CN104295244A CN104295244A CN201410517076.1A CN201410517076A CN104295244A CN 104295244 A CN104295244 A CN 104295244A CN 201410517076 A CN201410517076 A CN 201410517076A CN 104295244 A CN104295244 A CN 104295244A
- Authority
- CN
- China
- Prior art keywords
- rod
- sucker rod
- wear
- lifting sub
- rod body
- 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.)
- Pending
Links
- 230000002421 anti-septic effect Effects 0.000 title abstract 7
- 239000000463 material Substances 0.000 claims abstract description 6
- 210000002445 nipple Anatomy 0.000 claims description 25
- -1 polyethylene Polymers 0.000 claims description 8
- 229920001903 high density polyethylene Polymers 0.000 claims description 7
- 239000004700 high-density polyethylene Substances 0.000 claims description 7
- 238000005553 drilling Methods 0.000 claims description 6
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 6
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 6
- 238000005253 cladding Methods 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 5
- JHWNWJKBPDFINM-UHFFFAOYSA-N Laurolactam Chemical compound O=C1CCCCCCCCCCCN1 JHWNWJKBPDFINM-UHFFFAOYSA-N 0.000 claims description 4
- 229920000299 Nylon 12 Polymers 0.000 claims description 4
- 229920002292 Nylon 6 Polymers 0.000 claims description 4
- 229920002302 Nylon 6,6 Polymers 0.000 claims description 4
- 239000004952 Polyamide Substances 0.000 claims description 4
- 229920001577 copolymer Polymers 0.000 claims description 4
- 229920003020 cross-linked polyethylene Polymers 0.000 claims description 4
- 239000004703 cross-linked polyethylene Substances 0.000 claims description 4
- 229920002647 polyamide Polymers 0.000 claims description 4
- 239000004698 Polyethylene Substances 0.000 claims description 3
- 239000004743 Polypropylene Substances 0.000 claims description 3
- 239000004793 Polystyrene Substances 0.000 claims description 3
- 239000003822 epoxy resin Substances 0.000 claims description 3
- 239000000835 fiber Substances 0.000 claims description 3
- 229920000647 polyepoxide Polymers 0.000 claims description 3
- 229920000573 polyethylene Polymers 0.000 claims description 3
- 229920001155 polypropylene Polymers 0.000 claims description 3
- 229920002223 polystyrene Polymers 0.000 claims description 3
- 229920005989 resin Polymers 0.000 claims description 3
- 239000011347 resin Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 6
- 230000008878 coupling Effects 0.000 abstract description 3
- 238000010168 coupling process Methods 0.000 abstract description 3
- 238000005859 coupling reaction Methods 0.000 abstract description 3
- 239000003129 oil well Substances 0.000 abstract 1
- 239000007788 liquid Substances 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- 238000005086 pumping Methods 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 239000002033 PVDF binder Substances 0.000 description 1
- 239000004809 Teflon Substances 0.000 description 1
- 229920006362 Teflon® Polymers 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 238000010009 beating Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229920000840 ethylene tetrafluoroethylene copolymer Polymers 0.000 description 1
- 229920001519 homopolymer Polymers 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 238000004148 unit process Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
- E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
- E21B17/042—Threaded
-
- 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
- E21B17/02—Couplings; joints
- E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
-
- 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
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)
- Earth Drilling (AREA)
Abstract
The invention relates to a combined antiseptic and wear-resistant sucker rod which is applicable to an oil well which is strong in corrosivity and severe in eccentric wear. The combined antiseptic and wear-resistant sucker rod comprises a rod body, threaded joints at the two ends of the rod body, and an antiseptic and wear-resistant layer covering the outer surface of the sucker rod, wherein the threaded joints are outer threaded joints, and drill rod bodies at the threaded joints are provided with annular convex flanges; the antiseptic and wear-resistant layer integrally covers the rod body and are flanged to the inside of the rod body along the annular convex edges on the threaded joints at the two ends of the rod body; the threaded joint at one end of the rod body is connected with a lifting joint, and the threaded joint at another end of the rod body is connected with a coupling or a lifting joint; and more than two centralizes are alternately arranged on the rod body. According to the combined antiseptic and wear-resistant sucker rod provided by the invention, on the basis of a primary sucker rod, a covering material in a special structure, a supporting lifting joint, the coupling and the centralizer are adopted to thoroughly solve the problem that the oil sucker is integrally damaged because the joints of the sucker rod are separately damaged in the process of operating; furthermore, the service life of the combined antiseptic and wear-resistant sucker rod is more than ten times longer than an existing integrated sucker rod, and the field operation can be realized more conveniently.
Description
Technical field
The present invention relates to a kind of combined type anticorrosive abrasion-proof sucker rod being applicable to severe corrosive and eccentric wear Severe well in drilling tool technical field.
Background technology
Sucker rod is one of important tool of oil exploitation, its structure composition characteristic is made up of the joint entirety at the body of rod and two ends, increasing along with water injection well in oil fields, inclined shaft and horizontal well, traditional sucker rod is owing to lacking the topping of necessity in the body of rod outside of metal material, in use mainly deposit problem both ways: one is the existence due to underground corrosion material (mainly corrosive liquids and corrosive gas), very easily corrosion is produced to the sucker rod exposed part of metal material; Two is sucker rods easily produces with the borehole wall and rubs in constantly reciprocating movement, and particularly inclined shaft or horizontal well, fricting movement damages larger to sucker rod.
At present, solve the means of pumping rod anti-corrosive mainly at the outside coating anticorrosive coat of sucker rod, but this coated layer frayed after, still can not solve Anticorrosion; Solve sucker rod wearing and tearing mainly by installing centralizer additional or coating wearing layer outside sucker rod outside sucker rod; but although these two kinds of modes can play a protective role to the body of rod of sucker rod; but in actuating oil-pumping unit process; due to rod connector needs and elevator instrument power friction; joint area is easy to occur wearing and tearing; this application life just causing sucker rod significantly shortens, and affects the normal production in oil field.
Summary of the invention
Object of the present invention is exactly the problems referred to above existed for prior art, provides a kind of combined type anticorrosive abrasion-proof sucker rod with more severe corrosive and eccentric wear Severe well
Technical scheme of the present invention is
A kind of combined type anticorrosive abrasion-proof sucker rod, comprise the nipple at the body of rod and body of rod two ends, and the coated anticorrosion antiwear layer in sucker rod appearance, wherein: described nipple is male connection, and the drilling rod body at nipple place is with convex annular edge; Described anticorrosion antiwear layer integrated cladding the body of rod, and along the convex annular at nipple place, two ends along flange to the inside; Be connected with lifting sub at the nipple place of body of rod one end, be connected with box cupling or lifting sub at the nipple place of the body of rod other end; On the body of rod, interval arranges two or more centralizer.
Such scheme also comprises:
There is the little neck of lengthening at the middle part of described lifting sub, and lifting sub is provided with flat square structure; This flat square structure is located at a pier thick end of lifting sub, or is located on the pier runic in the middle part of lifting sub.
The link of described lifting sub and box cupling at least coordinates for being connected with the body of rod external screw thread one end, and and forms end face seal with the anticorrosion antiwear layer of rod end in-flanges and coordinate.
Such scheme comprises further: described anticorrosion antiwear layer coated material comprises arbitrary class of nylon-type, polyethylene kind or high-intensity resin class.Comprise the composition of any one or several in nylon 6, nylon66 fiber, nylon 12 or high density polyethylene (HDPE), crosslinked polyethylene or Kynoar, TFE copolymer, polytetrafluoroethylene (PTFE), polyamide, polypropylene, polystyrene, epoxy resin.
Technique effect of the present invention:
Lifting sub is installed in one end of the body of rod, lifting sub can make elevator and large stubborn button instrument in operation process, when avoiding operation, the anticorrosive coat of the oil pumping body of rod contacts with instrument and damages, lifting sub is convenient for changing, and thoroughly solves in operation process the problem damaged separately rod connector and cause sucker rod entirety to be damaged.The anticorrosion antiwear layer of the body of rod is flange to the inside at both ends, when box cupling or lifting sub and the body of rod fastening after, its mating face forms reliable end face seal, prevents liquid from entering between the body of rod and anticorrosive coat and corrodes sucker rod.The anticorrosive coat of the body of rod is established 2-6 centralizer, prevents the body of rod from contacting with oil pipe to produce and wear and tear, improve sucker rod application life.Proved by field test: the more existing one sucker rod length more than tens times in application life of this anticorrosive abrasion-proof sucker rod, and more convenient field operation.
Accompanying drawing explanation
Accompanying drawing 1 is the structural representation of the first embodiment of the present invention;
Accompanying drawing 2 is structural representations of the second embodiment of the present invention;
Accompanying drawing 3 is structural representations of the third embodiment of the present invention;
Accompanying drawing 4 is the partial enlarged drawings at sucker rod nipple place.
In figure, the first box cupling of 1-, 2-anticorrosion antiwear layer, the 3-body of rod, 4-centralizer, the first lifting sub of 5-, the lifting sub of 6-the second, 7-the second box cupling, side flanging in 8-, the flat square structure of 9-.
Detailed description of the invention
Embodiment 1
With reference to accompanying drawing 1, a kind of combined type anticorrosive abrasion-proof sucker rod, is made up of box cupling 1, anticorrosion antiwear layer 2, the body of rod 3, centralizer 4 and lifting sub 5.With reference to Fig. 4, the body of rod 3 two ends are male connection, and the drilling rod body at nipple place is with convex annular edge; Anticorrosion antiwear layer 2 integrated cladding the body of rod, and along the convex annular at nipple place, two ends along flange 8 to the inside; Be connected with lifting sub 5 at the nipple place of the body of rod 3 one end, be connected with box cupling 1 at the nipple place of the body of rod 3 other end, and form end face seal with the anticorrosion antiwear layer 2 of the body of rod 3 tip inside flange 8 and coordinate; On the body of rod 3, interval arranges 2-6 centralizer 4.
Wherein: there is the little neck of lengthening at the middle part of lifting sub 5, and one end internal thread is be connected with body of rod external screw thread to coordinate, and the other end is male connection, and is provided with flat square structure 9 on the pier runic near male connection place; Box cupling 1 adopts two ends female adapter mode.
Embodiment 2
With reference to accompanying drawing 2, a kind of combined type anticorrosive abrasion-proof sucker rod, is made up of box cupling 7, anticorrosion antiwear layer 2, the body of rod 3, centralizer 4 and lifting sub 5.With reference to Fig. 4, the body of rod 3 two ends are male connection, and the drilling rod body at nipple place is with convex annular edge; Anticorrosion antiwear layer 2 integrated cladding the body of rod, and along the convex annular at nipple place, two ends along flange 8 to the inside; Be connected with lifting sub 5 at the nipple place of the body of rod 3 one end, be connected with box cupling 7 at the nipple place of the body of rod 3 other end, and form end face seal with the anticorrosion antiwear layer 2 of the body of rod 3 tip inside flange 8 and coordinate; On the body of rod 3, interval arranges 2-6 centralizer 4.
Wherein: there is the little neck of lengthening at the middle part of lifting sub 5, and two ends internal thread is be connected with body of rod external screw thread to coordinate, and is provided with flat square structure 9 on the male connection place pier runic near upper end.Box cupling 7 adopts one end female adapter, other end male connection mode.
Embodiment 3
With reference to accompanying drawing 3, a kind of combined type anticorrosive abrasion-proof sucker rod, is made up of box cupling 1, anticorrosion antiwear layer 2, the body of rod 3, centralizer 4 and lifting sub 5.With reference to Fig. 4, the body of rod 3 two ends are male connection, and the drilling rod body at nipple place is with convex annular edge; Anticorrosion antiwear layer 2 integrated cladding the body of rod, and along the convex annular at nipple place, two ends along flange 8 to the inside; Be connected to lifting sub 5 at the nipple place at the body of rod 3 two ends, be connected with box cupling 7 at the nipple place of lifting sub 5 upper end on top, lifting sub 5 forms end face seal with the anticorrosion antiwear layer 2 of the body of rod 3 tip inside flange 8 and coordinates; On the body of rod 3, interval arranges 2-6 centralizer 4.
Wherein: there is the little neck of lengthening at the middle part of two lifting subs 5, and one end internal thread is be connected with the body of rod 3 external screw thread to coordinate, and the other end is male connection, and is provided with flat square structure 9 on the pier runic near male connection place; Box cupling 1 adopts two ends female adapter mode.
On the basis of above-described embodiment, sucker rod two ends can also be adopted to connect a two joint for internal thread and the combination of a single female adapter and a single male connection respectively.
Coated material in above-described embodiment can be polymer, thermoplastic polymer, co-polymer, homopolymer, composition polymer, coextru-lamination polymer.Such as nylon-type: nylon 6 (Nylon6), nylon66 fiber (Nylon66), nylon 12(Nylon12) etc.Polyethylene kind: high density polyethylene (HDPE) (HDPE), crosslinked polyethylene (PEX).High-intensity resin class: Kynoar (PVDF), TFE copolymer (ETFE), polytetrafluoroethylene (PTFE) (Teflon), polyamide (Polyamide), polypropylene, polystyrene, epoxy resin or their composition.
Principle of the present invention: the coated anticorrosion antiwear layer of external surface of the body of rod, two ends anticorrosion antiwear layer flange to the inside, the two ends connection coupling of the body of rod and lifting sub.The body of rod and box cupling and lifting sub special tool fastening in factory, and form end face seal with the end of the body of rod, prevent liquid from entering between the body of rod and anticorrosion antiwear layer and corroding sucker rod.There is the little neck of lengthening at the middle part of lifting sub, and for beating elevator in operation process, the outer garden of outer end major part of lifting sub is provided with flat square structure, twists mouth instrument for card in operation process.Anticorrosive coat in the middle part of the body of rod is installed 2-6 centralizer, improve abrasion resistance.
Claims (5)
1. a combined type anticorrosive abrasion-proof sucker rod, comprise the nipple at the body of rod and body of rod two ends, and the coated anticorrosion antiwear layer in sucker rod appearance, it is characterized in that: described nipple is male connection, and the drilling rod body at nipple place is with convex annular edge; Described anticorrosion antiwear layer integrated cladding the body of rod, and along the convex annular at nipple place, two ends along flange to the inside; Be connected with lifting sub at the nipple place of body of rod one end, be connected with box cupling or lifting sub at the nipple place of the body of rod other end; On the body of rod, interval arranges two or more centralizer.
2. combined type anticorrosive abrasion-proof sucker rod according to claim 1, is characterized in that: there is the little neck of lengthening at the middle part of described lifting sub, and lifting sub is provided with flat square structure; This flat square structure is located at a pier thick end of lifting sub, or is located on the pier runic in the middle part of lifting sub.
3. combined type anticorrosive abrasion-proof sucker rod according to claim 2, it is characterized in that: the link of described lifting sub and box cupling at least coordinates for being connected with the body of rod external screw thread one end, and and form end face seal with the anticorrosion antiwear layer of rod end in-flanges and coordinate.
4. the combined type anticorrosive abrasion-proof sucker rod according to claim 1,2 or 3, is characterized in that: described anticorrosion antiwear layer coated material comprises arbitrary class of nylon-type, polyethylene kind or high-intensity resin class.
5. combined type anticorrosive abrasion-proof sucker rod according to claim 4, is characterized in that described anticorrosion antiwear layer coated material comprises the composition of any one or several in nylon 6, nylon66 fiber, nylon 12 or high density polyethylene (HDPE), crosslinked polyethylene or Kynoar, TFE copolymer, polytetrafluoroethylene (PTFE), polyamide, polypropylene, polystyrene, epoxy resin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410517076.1A CN104295244A (en) | 2014-09-30 | 2014-09-30 | Combined antiseptic and wear-resistant sucker rod |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410517076.1A CN104295244A (en) | 2014-09-30 | 2014-09-30 | Combined antiseptic and wear-resistant sucker rod |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104295244A true CN104295244A (en) | 2015-01-21 |
Family
ID=52315161
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410517076.1A Pending CN104295244A (en) | 2014-09-30 | 2014-09-30 | Combined antiseptic and wear-resistant sucker rod |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104295244A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106014287A (en) * | 2016-07-07 | 2016-10-12 | 浙江睿智钢业有限公司 | Petroleum pipeline and application thereof |
| CN108266132A (en) * | 2016-12-30 | 2018-07-10 | 克拉玛依市创铭石油科技有限公司 | A kind of isometrical hollow pipe roofbolt of eccentric abrasion prevention |
| CN109025841A (en) * | 2018-08-21 | 2018-12-18 | 山东九环石油机械有限公司 | A kind of stainless steel Anti-corrosion sucker rod |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2578512Y (en) * | 2002-10-26 | 2003-10-08 | 滨州华闻机械有限责任公司 | Self stabilizing device for prevention of eccentrically worn drill pipe |
| CN2797613Y (en) * | 2005-01-31 | 2006-07-19 | 东营市运通工贸有限公司 | Vertical rotating combination type off-axis wear proof device |
| CN200971754Y (en) * | 2006-08-02 | 2007-11-07 | 李永祥 | Partial abrasion protection sucker rod |
| CN201460754U (en) * | 2009-05-21 | 2010-05-12 | 四川省杰尼亚化工有限责任公司 | Sucker rod with eccentric wear prevention |
| CN201650150U (en) * | 2010-03-12 | 2010-11-24 | 陈晓辉 | Novel elastically-supported wear-resistant and wear-reducing pair |
| CN201687403U (en) * | 2010-04-20 | 2010-12-29 | 王顺华 | Heat insulating pipe for producing oil |
| CN202810679U (en) * | 2012-08-14 | 2013-03-20 | 山东创佳石油机械制造有限公司 | Anti-corrosion and wear-resistant sucker rod |
| CN203285357U (en) * | 2013-06-06 | 2013-11-13 | 谢伟 | Antiseptic wear-resisting sucker rod |
| CN204098798U (en) * | 2014-09-30 | 2015-01-14 | 胜利油田胜机石油装备有限公司 | Combined type anticorrosive abrasion-proof sucker rod |
-
2014
- 2014-09-30 CN CN201410517076.1A patent/CN104295244A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2578512Y (en) * | 2002-10-26 | 2003-10-08 | 滨州华闻机械有限责任公司 | Self stabilizing device for prevention of eccentrically worn drill pipe |
| CN2797613Y (en) * | 2005-01-31 | 2006-07-19 | 东营市运通工贸有限公司 | Vertical rotating combination type off-axis wear proof device |
| CN200971754Y (en) * | 2006-08-02 | 2007-11-07 | 李永祥 | Partial abrasion protection sucker rod |
| CN201460754U (en) * | 2009-05-21 | 2010-05-12 | 四川省杰尼亚化工有限责任公司 | Sucker rod with eccentric wear prevention |
| CN201650150U (en) * | 2010-03-12 | 2010-11-24 | 陈晓辉 | Novel elastically-supported wear-resistant and wear-reducing pair |
| CN201687403U (en) * | 2010-04-20 | 2010-12-29 | 王顺华 | Heat insulating pipe for producing oil |
| CN202810679U (en) * | 2012-08-14 | 2013-03-20 | 山东创佳石油机械制造有限公司 | Anti-corrosion and wear-resistant sucker rod |
| CN203285357U (en) * | 2013-06-06 | 2013-11-13 | 谢伟 | Antiseptic wear-resisting sucker rod |
| CN204098798U (en) * | 2014-09-30 | 2015-01-14 | 胜利油田胜机石油装备有限公司 | Combined type anticorrosive abrasion-proof sucker rod |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106014287A (en) * | 2016-07-07 | 2016-10-12 | 浙江睿智钢业有限公司 | Petroleum pipeline and application thereof |
| CN106014287B (en) * | 2016-07-07 | 2018-01-30 | 浙江睿智钢业有限公司 | A kind of petroleum pipeline and its application |
| CN108266132A (en) * | 2016-12-30 | 2018-07-10 | 克拉玛依市创铭石油科技有限公司 | A kind of isometrical hollow pipe roofbolt of eccentric abrasion prevention |
| CN109025841A (en) * | 2018-08-21 | 2018-12-18 | 山东九环石油机械有限公司 | A kind of stainless steel Anti-corrosion sucker rod |
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20150121 |
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| RJ01 | Rejection of invention patent application after publication |