CN101396874B - Preparation method and device of eccentric wear prevention pumping rod - Google Patents
Preparation method and device of eccentric wear prevention pumping rod Download PDFInfo
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- CN101396874B CN101396874B CN2007101752570A CN200710175257A CN101396874B CN 101396874 B CN101396874 B CN 101396874B CN 2007101752570 A CN2007101752570 A CN 2007101752570A CN 200710175257 A CN200710175257 A CN 200710175257A CN 101396874 B CN101396874 B CN 101396874B
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Abstract
The invention relates to a method for preparing a composite material sucker rod which can prevent camber wear and a device thereof. Combining pultrusion and winding, fibre is immersed by resin matrix, and the composite material sucker rod is prepared by pultrusion, curing and shaping; the surface of the rod body is continuously wound with wearing fibre immersed by resin matrix glue after shaping; the rod body of the sucker rod, the surface of which is provided with a camber wear preventing layer of a spiral bar shape is obtained by curing; the rod body of the sucker rod is cut to be in fixed length, is connected with a metal joint by glue, and is treated in a joint curing furnace; the whole sucker rod is stretched by inherent stress. The surface of the rod body of the sucker rod is provided with the camber wear preventing layer of a spiral bar shape, thus having excellent camber wear preventing performance while ensuring a high intensity of the sucker body; the inverse cone structure of the metal joint and the pressure injection glue connection process ensure the joint part has the properties of high intensity and fatigue proof, the service life of which is consistent with the composite material rod body, and the reliability of the products is greatly improved.
Description
Technical field
The present invention is preparation method and the device of a kind of oil field machinery oil with sucker rod, and particularly pultrusion and winding process prepare the method and apparatus of the anti-eccentric wear composite sucker rod of high strength.
Background technology
Because the oil reservoir type of exploitation becomes increasingly complex, the continuous increase of well depth and the continuous deterioration of well ore deposit environment simultaneously, the composite sucker rod has begun progressively to replace traditional metal sucker rod.The composite sucker rod that adopts mainly comprises traditional glass fiber reinforced plastic oil pumping rod and carbon fibre reinforced composite coiled rod two big classes at present.Traditional glass fiber reinforced plastic oil pumping rod adopts the pultrude process one-shot forming preparation of glass-fiber reinforced thermo-setting resin, extensive use, but the reliability requirement that recovers the oil along with the modern times improves constantly, this traditional glass fiber reinforced plastic oil pumping rod can not meet the demands, mainly there is following problem, 1, the anti-eccentric wear of sucker rod is bad; 2, fatigue strength is not enough; 3 metal joints that are connected with the body of rod generally adopt overall structure, and the joint difficulty of processing is big, and it is less to be subjected to difficulty of processing to influence bond area; And when glueing joint injecting glue between the joint and the body of rod air in the cavity be difficult for discharging, cause in the discontented or solidfied material of injecting glue a large amount of bubbles being arranged, make that the coupling part fatigue durability is bad, come off easily, poor reliability, influence is synchronous with the life-span of sucker rod thus.Chinese patent CN1461870 discloses a kind of carbon fibre reinforced composite coiled rod and preparation method, the employing carbon fiber is a reinforcing material, and by transversely arranged aramid fiber or superhigh molecular weight polyethylene fibers bundle and longitudinally glass fibre to form integral coating compound, mainly solve and strengthen the horizontal interlaminar shear strength of sucker rod, thereby avoid sucker rod that the problem of longitudinal splitting takes place in oil well, the while has also been improved the anti-eccentric wear and the intensity of the body of rod.But this sucker rod adopts the Integratively processing method of pultrusion, coating, (comprise and put silk-online surface treatment-resin pickup glue-clad coating-preformed-curing-back curing-coiling operation), clad was a fabric, not only strengthen material cost, and the anti-eccentric wear of integral fabric clad is desirable not enough.And coiled rod for carbon fibre reinforced composite, when using, must adopt the special use implement of going into the well, the implement development difficulty is bigger and special use is gone into the well, become the technical bottleneck in the application of carbon fibre reinforced composite coiled rod, particularly in recent years along with the carbon fiber price soars, the cost of raw material significantly rises, and has therefore limited this product large-scale promotion application.CN1417449A discloses a kind of preparation method of abrasionproof sucker rod, this method is the anti-abrading block of material such as quadric injection mould moulding nylon in type sucker rod body, reduce the clad material that uses, reduce and coat cost and process complexity continuously, but the property difference of quadric injection mould processing and different materials causes the adhesion strength of sucker rod and abrasionproof interblock lower, can't satisfy the long-life instructions for use of sucker rod.
Summary of the invention
The present invention proposes a kind of preparation for processing of the sucker rod of anti-the eccentric wear, anti-eccentric wear, reduction integrated cost with raising sucker rod integral body are main purpose, prepare anti-eccentric wear height, be connected with metal joint reliably, overall performance is good, can improve the sucker rod that life-span, operation are easy to use, cost is low of composite sucker rod.
The present invention also provides the device for preparing this sucker rod.
The preparation method of the eccentric wear prevention pumping rod that the present invention proposes: by pultrusion and winding process combination, comprising: with glass fibre or its assorted fibre, behind the impregnating resin matrix, prepare the composite sucker rod body of rod by the pultrusion cure process, the abrasion resistant fibrous of resin matrix glue flooded in winding continuously on body of rod surface, winding angle is between 15～75 ° when twining continuously, the speed of twining be 0.5～20 circle/minute, it is identical with the used impregnating resin matrix of pultrude process glue to twine fiber impregnated resin, the body of rod behind the winding fiber is through curing process, make the sucker rod body of rod that there is the anti-eccentric wear layer of spiral bar shape on the surface, the sucker rod body of rod is cut into fixed length, glued joint into the composite sucker rod with metal joint, place the joint curing oven to handle two hours down then at 120～180 ℃; With the whole employing of sucker rod stretching autofrettage, the pulling force size is 100～250,000 Ns.
The pultrusion curing molding of said method is known process, and used resin matrix is a kind of or its hybrid resin of epoxy resin, vinyl ester resin or unsaturated-resin commonly used.
In the winding process of said method, on the body of rod, twine a branch of or multi beam is abrasion resistant fibrous, form one or multi-channel spiral helicine muscle.Preferred 0.5～5 circle of preferred 15～45 ° of winding angle, speed/minute, the preferred 0.5～1.5mm of thickness.Be heating and curing through infrared after the winding, solidification temperature adopts the gradient increased temperature mode between 95～180 ℃.
Abrasion resistant fibrous described in the said method is known aramid fiber, pbo fiber or superhigh molecular weight polyethylene fibers.Or its combination assorted fibre
The oil pumping body of rod and metal joint glued joint in the said method, and the adhesive of employing is a high shear strength epoxy type adhesive, and shear strength is 〉=22N/mm
2, 25 ℃ of viscosity are 12～20PaS.The injecting glue mode adopts the pressure injecting glue, and pressure limit is 0.2～1Mpa.
Described sucker rod body section can be circular, square or other shaped face.
Described metal joint is that inner chamber is the split type metal joint of Pyatyi back taper structure, and the body of rod inserts the connection of cavity injecting glue from the small size end of back taper.
In the said method, the sucker rod bar entire length after the described autofrettage meets the API standard.
The device of the anti-eccentric wear composite sucker rod of preparation provided by the invention, comprise: put guide frame, the preliminary treatment heating furnace, gumming device, the preformed heating furnace, pultrusion die, mold heating device, control section, draw-gear is formed continuous pultrusion equipment, it is characterized in that, behind pultrusion equipment, be provided with the wrapping machine of single head or bull, device and cutter sweep are heating and curing, comprise that also the body of rod and metal joint glued joint the pressure glue-injection machine and the joint curing oven of usefulness, wherein gum-injecting port one end of pressure glue-injection machine is connected with the metal joint hole for injecting glue, the other end is entered by compressed air control piston promotion glue and is full of the metal joint internal cavities that inserts the sucker rod body of rod, joint curing oven lower furnace door is fixed, upper furnace door is an automatic-lifting type, last lower furnace door respectively has one group of open semi circular hole in correspondence with each other, its diameter is greater than sucker rod body of rod diameter, after the last lower furnace door closure, matching of each semicircle orifice and lower furnace door guarantees each root oil pumping body of rod is stuck in the circular hole.
Described metal joint adopts back taper type split-type structural, and promptly inner chamber is linked to be by a plurality of back tapers, and the body of rod inserts the inner chamber from back taper small size end, split type joint makes processing simple, and inner structure size is accurate, and can increase length as required, guaranteed the area that is connected with the body of rod
In the said apparatus, described pultrusion and Wiring apparatus are known equipment on sale.
Device of the present invention also comprises horizontal hydraulic drawing mechanism autofrettage checkout equipment.
Effect of the present invention: adopt pultrusion and twine assembling process, twine the abrasion resistant fibrous forming and hardening technology of dipping same resin matrix glue on the sucker rod surface, form the anti-eccentric wear layer of spiral bar shape on body of rod surface by control speed of wrap, angle, make the performance of the anti-eccentric wear of the existing excellence of sucker rod, guaranteed the high strength of sucker rod again; Simultaneously the sucker rod body of rod and the winding layer bonding interface height between the two has avoided preventing slippage and the layering of eccentric wear layer from the sucker rod surface in oil well; Winding process can adopt the fabric in the fibre bundle replacement cladding process in addition, greatly reduces material cost; The pressure injecting glue has guaranteed that glue is full of the joint inner space, and has reduced the air bubble content in the glue, has guaranteed the intensity of adhesive solidification; It is simple that the split type back taper structure of metal joint makes that processing becomes, and make bond area increase greatly, guarantee that the joint coupling part has possessed high-strength, fatigue proof characteristic, and meet the API standard, keep unified with the life-span of the composite body of rod, farthest bring into play the excellent properties of the composite body of rod; Method of the present invention in addition can cutting processing length meets the sucker rod of API standard, operating type when not only making its application, equipment and common metal sucker rod are identical, need not to develop special operation equipment, and can carry out autofrettage and detection to whole sucker rod, after stressed effect, eliminated the relative displacement that the strain that is connected adhesive with metal joint because of the body of rod causes the body of rod and metal joint to produce, guaranteed the integrality of properties of product, realized the online detection of composite sucker rod, stop the generation of contingent, improved reliability of products greatly.Particularly use method of the present invention, can improve the performance of simple glass fibrous composite sucker rod greatly, making cheaply, the conventional composite materials sucker rod continues to be extensive use of.Device of the present invention has been realized method of the present invention, and joint curing efficiency height, and is easy and simple to handle.
Description of drawings
Fig. 1 is preparation method's process flow diagram of the present invention;
Fig. 2 is the metal joint structural representation;
Fig. 3 is a pressure glue-injection machine schematic diagram:
Fig. 4 is autofrettage and on-line measuring device schematic diagram;
Fig. 5 is the schematic diagram of the position of joint in curing oven:
Fig. 6 is the Facad structure schematic diagram under the lower furnace door merging phase on the joint curing oven
The specific embodiment:
As shown in Figure 1, the inventive system comprises: put guide frame 1, preliminary treatment heating furnace 2, gumming device 3, preformed heating furnace 4, pultrusion die 5, mold heating device 6, control section 7, the continuous pultrusion equipment of draw-gear 8 compositions, behind pultrusion equipment, be provided with the wind 9 of single head or bull, infrared device 10 and the cutter sweep 11 of being heating and curing, last at device, a pressure glue-injection machine 12 and a joint curing oven 13 that is used for the joint solidification by cement is set.Wherein pressure glue-injection machine (as a Fig. 3) end and metal joint hole for injecting glue guarantee sealing by being threaded, and the other end connects the compressed air of adjustable pressure size, and control piston promotes glue and enters and be full of the metal joint internal cavities that inserts the body of rod.Joint curing oven such as Fig. 5, shown in Figure 6, one group of (20) rod connector simultaneously can be heating and curing, joint curing oven lower furnace door 14 is fixing, upper furnace door 15 is an automatic-lifting type, last lower furnace door respectively has one group of (20) open semi circular hole in correspondence with each other, and its slightly larger in diameter is in body of rod diameter, after lower furnace door coincide in the assurance, not big gap is to keep the furnace chamber sealing.Furnace chamber is partly inserted in the injecting glue rod connector to be solidified that finishes, and the body of rod of joint rear end is put into the semicircle orifice of lower furnace door, and 20 joints are all put well, liftable upper furnace door descends, matching of each semicircle orifice and lower furnace door is stuck in 20 bodies of rod in the circular hole, and internal temperature is even.Curing oven divides three sections heating, and inside is equipped with fan respectively, guarantees that the temperature of the inner each point of furnace chamber is identical, and error is ± 1 ℃.
Device of the present invention also comprises autofrettage checkout equipment 17 (see figure 4)s.The autofrettage checkout equipment is the horizontal hydraulic drawing mechanism, two stretching heads are arranged, and one can be moved along axis front and back for the plunger of movable stretching head 20 with hydraulic cylinder 18 for 19, one of fixing stretching heads, can be connected respectively, to sucker rod stretch autofrettage and detection with the sucker rod two ends.Determine the pulling force size according to application need, be generally 100～250,000 Ns, the polished rod load of oil pumper in the practical application is the setting value of the pulling force of determining as hydraulic cylinder 18.Composite sucker rod one end is connected with fixing stretching head 19, the other end is connected with movable stretching head 20, primer fluid cylinder pressure 18 pulls back, when reaching setting value, hydraulic cylinder stops oil-feed, keeps this setting pulling force 〉=1 minute, hydraulic cylinder counter motion then, the composite sucker rod is unloaded from the autofrettage checkout equipment, and autofrettage finishes to the composite sucker rod.During pumping rod application, after stressed effect, the body of rod is being connected used adhesive because strain causes the body of rod and metal joint to produce relative displacement with metal joint, and the purpose of autofrettage is to eliminate this relative displacement.Handling used pulling force size 100～250,000 Ns has surpassed and has used needed pulling force, therefore in anti-eccentric wear composite sucker rod autofrettage to high strength, also the overall performance to sucker rod has carried out effective detection, after promptly reaching setting value, the composite body of rod does not produce the qualified products that are of relative slip with metal joint, and the relative slip of generation is substandard product.
In above-mentioned device, realize that the concrete mode of preparation method of the present invention is:
(1) draws multiple fibre (one or more of glass fibre, the contour performance fibers of carbon fiber) from putting guide frame 1, process heating furnace 2 preliminary treatment under the traction of draw-gear 8, atmosphere is air, furnace temperature is between 80～150 ℃, hauling speed between 0.08～1.0 meter/minute, by the time be 1.5～12.5 minutes; The fiber that comes out from heating furnace 2 enters gumming device 3, and the resin matrix glue in the gumming device is formulated as known method, wherein the portions of resin curing agent: the mass fraction of releasing agent is 100: 0.5～5.0: 0.5～5.0.Curing agent is the common peroxidized t-butyl perbenzoate (TBPB) that adopts, dibenzoyl peroxide (BPO), methyl ethyl ketone peroxide solution (MEKP) etc., and releasing agent is zinc stearate or other like product that adopts usually.
(2) fibre bundle through gumming device 3 dippings passes through heating furnace 4 preformed and preliminary gelation again.The preformed furnace atmosphere is an air, and furnace temperature is between 100～180 ℃.
(3) fibre bundle after the preformed enters extruding equipment, curing molding in mould 5, pultrusion utilizes 6 three sections of mold heating devices or four sections heating, solidification temperature is between 95～180 ℃, heating mode in gradient, pultrusion speed is between 0.08～1.0 meter/minute, and pultrusion goes out the composite body of rod.
(4) wind 9 twines a branch of on the composite body of rod behind the pultrusion or multi beam is abrasion resistant fibrous, as: aramid fiber, pbo fiber or superhigh molecular weight polyethylene fibers or its assorted fibre, its winding angle is between 15～75 °, preferably 15～45 °, the yarn of fiber or the thickness of fabric are between 0.5～1.5mm, and dipping glue prescription is identical with the used dipping glue of pultrude process described in (1).Twining head be single head or bull, the speed of winding be 0.5～20 circle/minute, preferably 0.5～5 encloses/minute.Solidify through the infrared device 10 that is heating and curing after the winding, obtain having the oil pumping body of rod of the anti-eccentric wear layer of spiral bar shape.Solidification temperature between 95～180 ℃, heating mode in gradient.
(5) determine the length of the required composite body of rod according to the API standard, utilize cutter sweep 11 that the composite body of rod of curing molding is cut down.The sucker rod body of rod of well cutting inserts from the small size end of the metal joint of back taper type, utilize pressure glue-injection machine 12 injecting glue in back taper type joint cavity, the adhesive that adopts is a high shear strength epoxy type adhesive, can select commercially available method configuration that also can be routinely, its shear strength is 〉=22N/mm
2, 25 ℃ of viscosity are 12～20PaS.The injecting glue pressure limit is 0.2～1Mpa.After injecting glue finishes, solidify by joint curing oven 13, handled two hours down at 120～180 ℃, adhesive solidification reaches best bonding strength fully, and the high strength that obtains is prevented eccentric wear composite sucker rod, and joint meets the API standard.
(6) the sucker rod body of rod is with after metal joint is connected, whole on autofrettage and checkout gear 17, stretch autofrettage and detection, and the pulling force size is set at 100～250,000 Ns, and keeps this setting pulling force 〉=1 minute.
Below by embodiment,, but the invention is not restricted to these embodiment to the detailed description of the invention.
Embodiment 1: the multi-beam carbon-fiber silk is entered into the surface treatment stove through row's silk hole of putting guide frame, collection filament plate, furnace temperature is 120 ℃, hauling speed is 0.4 meter/minute, carbon fiber after the heat treatment enters steeping vat, and metaphenylene unsaturated polyester resin S-685S: MEKP: BPO in the groove: the mass fraction of zinc stearate is 100: 1.5: 1.5: 1.5.Carbon fiber behind the impregnation enters the preformed stove, and the preformed temperature is 85 ℃, enters the mold cured moulding after the preliminary gel preformed, three sections heating of mould, and temperature is 110 ℃, 135 ℃, 155 ℃.Composite bar after the moulding continues vertically to advance with 0.4 meter/minute speed, by 2 wrapping machines with 5 circles/minute speed on the composite bar, twines two bundle aramid fibers, formation twice pitch is 10 millimeters spiral helicine muscle.The impregnation formulation of aramid fiber is with the prescription of pultrude process, and the diameter of two bundle aramid fibers is 1.5 millimeters.The composite sucker rod body of rod and metal joint after anti-eccentric wear layer is Wrapping formed glued joint, used adhesive is the epoxy type adhesive, epoxy resin E-44 wherein: methyl tetrahydro phthalic anhydride: DMP-30: the mass fraction of aluminium powder is 100: 85: 1.5: 20,25 ℃ of viscosity are 15PaS, and injecting glue pressure is 0.5MPa.After injecting glue finishes, insert the interior 150 ℃ of insulations of joint curing oven 1.5 hours.After the taking-up, cooling naturally.Carry out autofrettage and detection then, pulling force is 200,000 Ns.The composite sucker rod body of rod is not seen relative slip with metal joint, and it is qualified that product detects.
Embodiment 2: according to implementing 1, the carbon fiber that changes in the pultrusion process is a high-strength glass fibre, the heat treated furnace temperature of fiber is 100 ℃, hauling speed is 0.2 meter/minute, changing the interior resin of steeping vat is epoxy resin, E-51 wherein: methyl tetrahydro phthalic anhydride: DMP-30: the weight fraction of zinc stearate is 100: 85: 2.0: 1, the wrapping machine of the sucker rod after the moulding by 6 with 2.5 circles/minute speed twine six bundle pbo fiber moulding, form six road pitch and be 5 millimeters spiral helicine muscle.The impregnation formulation of pbo fiber is with the prescription of pultrude process, and the diameter of six bundle pbo fibers is 1 millimeter.The composite sucker rod body of rod and metal joint after anti-eccentric wear layer is Wrapping formed glued joint, used adhesive is the epoxy type adhesive, epoxy resin: curing agent: promoter: the mass fraction of filler is 100: 80: 1.5: 15,25 ℃ of viscosity are 17PaS, and injecting glue pressure is 0.6MPa.After injecting glue finishes, insert the interior 140 ℃ of insulations of joint curing oven 2 hours.After the taking-up, cooling naturally.Carry out autofrettage and detection then, pulling force is 150,000 Ns.Processing finishes, and the composite sucker rod body of rod is not seen relative slip with metal joint, and it is qualified that product detects.
Claims (6)
1. the preparation method of an anti-eccentric wear composite sucker rod, comprise: with glass fibre or its assorted fibre, behind the impregnating resin matrix, prepare the composite sucker rod body of rod by the pultrusion cure process, it is characterized in that, body of rod surface after moulding is twined continuously and was flooded the abrasion resistant fibrous of resin matrix glue, winding angle is between 15～75 ° when twining continuously, the speed of twining be 0.5～20 circle/minute, it is identical with the used impregnating resin matrix of pultrude process glue to twine fiber impregnated resin, the body of rod behind the winding fiber is through curing process, make the sucker rod body of rod that there is the anti-eccentric wear layer of spiral bar shape on the surface, the sucker rod body of rod is cut into fixed length, obtain the composite sucker rod after glueing joint with metal joint, place the joint curing oven to handle two hours down then at 120～180 ℃; With the whole employing of sucker rod stretching autofrettage, the pulling force size is 100～250,000 Ns.
2. according to the preparation method of claim 1, the used resin matrix of described dipping is one or several a hybrid resin of epoxy resin, vinyl ester resin.
3. according to the preparation method of claim 1, in the described winding process, on the body of rod, twine a branch of or multi beam is abrasion resistant fibrous, twine thickness 0.5～1.5mm.
4. according to the preparation method of claim 1, described abrasion resistant fibrous be aramid fiber, pbo fiber or superhigh molecular weight polyethylene fibers, or its combination assorted fibre.
5. according to the preparation method of claim 1, the described sucker rod body of rod and joint glued joint, and the adhesive of employing is the epoxy type adhesive, and shear strength is 〉=22N/mm
2, 25 ℃ of viscosity are 12～20PaS, and the injecting glue mode adopts the pressure injecting glue, and pressure limit is 0.2～1Mpa.
6. according to the preparation method of claim 1, described metal joint is the split type metal joint of back taper structure, and inner chamber is multistage back taper cavity structure, and the body of rod inserts the connection of cavity injecting glue from the small size end of back taper.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2007101752570A CN101396874B (en) | 2007-09-28 | 2007-09-28 | Preparation method and device of eccentric wear prevention pumping rod |
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| CN2007101752570A CN101396874B (en) | 2007-09-28 | 2007-09-28 | Preparation method and device of eccentric wear prevention pumping rod |
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| CN101396874B true CN101396874B (en) | 2010-06-30 |
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| CN103075112B (en) * | 2012-11-30 | 2014-03-12 | 胜利油田新大管业科技发展有限责任公司 | Fibre reinforced composite anti-eccentric coiled rod as well as preparation device and preparation method thereof |
| CN104343396A (en) * | 2013-08-02 | 2015-02-11 | 中国石油天然气股份有限公司 | Production method for coiled sucker rod made of fiber reinforced composite material |
| CN103991227A (en) * | 2014-04-30 | 2014-08-20 | 天津工业大学 | Production method for constant-section composite-material section material |
| CN106671453A (en) * | 2014-06-16 | 2017-05-17 | 胜利油田新大管业科技发展有限责任公司 | Manufacturing method of multi-layer composite eccentric wear preventing continuous sucker rod |
| CN105003209B (en) * | 2015-07-21 | 2018-03-02 | 山东大学 | A kind of sucker rod and preparation facilities and preparation method with composite screw wearing layer |
| CN105172169B (en) * | 2015-09-23 | 2017-11-07 | 胜利油田新大管业科技发展有限责任公司 | High-temperature resistance carbon fiber strengthens composite continuous sucker rod and preparation facilities and method |
| CN105625951B (en) * | 2016-02-29 | 2017-11-21 | 胜利油田新大管业科技发展有限责任公司 | A kind of preparation method of fibre reinforced composites eccentric abrasion prevention coiled rod |
| CN106837203B (en) * | 2016-09-30 | 2018-02-09 | 席小平 | A kind of preparation method of multilayer rub resistance carbon-fiber continuous rod |
| CN106239940B (en) * | 2016-09-30 | 2018-04-06 | 席小平 | A kind of multi-layer wear-resistant wipes the preparation facilities of carbon-fiber continuous rod |
| CN109551787A (en) * | 2017-09-27 | 2019-04-02 | 洛阳尖端技术研究院 | A kind of advanced pultrusion method and its molding machine of composite material section bar |
| CN110001329B (en) * | 2019-03-15 | 2021-12-21 | 株洲时代新材料科技股份有限公司 | Automobile chassis lining and forming method thereof |
| EP3782812B1 (en) | 2019-08-20 | 2023-08-02 | Roller Bearing Company of America, Inc. | Permanent, self-adhering, self-lubricating, anti-wear composite system |
| CN117207559B (en) * | 2023-11-09 | 2024-04-16 | 大庆市华禹石油机械制造有限公司 | Carbon fiber continuous sucker rod production equipment capable of improving compactness of carbon fiber core |
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| CN1258805A (en) * | 1999-12-10 | 2000-07-05 | 胜利石油管理局工程机械总厂 | Pumping rod of composite carbon fiber material and its manufacture |
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