CN212454282U - Novel sucker rod - Google Patents
Novel sucker rod Download PDFInfo
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- CN212454282U CN212454282U CN202021081358.9U CN202021081358U CN212454282U CN 212454282 U CN212454282 U CN 212454282U CN 202021081358 U CN202021081358 U CN 202021081358U CN 212454282 U CN212454282 U CN 212454282U
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Abstract
The invention relates to a novel sucker rod, which is characterized in that a first external thread joint, an unloading groove, a second external thread shoulder, a wrench square and a rod body which are symmetrically arranged at two ends of a sucker rod substrate are connected with a threaded sleeve in a sealing way; coating the threaded sleeve on a part of the rod body in an extruding mode; stress borne by the connecting position of the sucker rod can be reduced by arranging the unloading groove, so that the connecting is more stable; forming a coating layer on the outer surface of a standard sucker rod body by heating, middle-low pressure injection molding, curing and other processes on high polymer plastic; a flange is arranged at the connecting part of the wrench and the rod body; at least one groove is arranged on the partial inner wall of the rod body which is coated by the threaded sleeve; therefore, the whole-course corrosion prevention purpose of the sucker rod body is realized, the processing is simple, the cost is low, the corrosion prevention, the abrasion resistance and the reliability are high, the service life of the sucker rod body can be prolonged, the well repairing operation cost of an oil well is reduced, and the economic benefit of the oil field is improved.
Description
Technical Field
The invention relates to the technical field of petroleum drilling and production equipment components, in particular to a novel corrosion-resistant and wear-resistant sucker rod.
Background
The pumping rod is subjected to the combined action of alternating load, oil, gas, water and corrosive medium for a long time, and the rod pipe is eccentrically worn, so that the pumping rod becomes equipment with the lowest reliability in mechanical oil extraction, and a disconnection accident is easy to occur.
Most oil fields in China enter the middle and later stages of development, the comprehensive water content is higher and higher, production increasing measures such as water injection and the like are often adopted, and the reinjection water of the oil fields is basically direct reinjection of sewage, so that the working environment of the sucker rod is very bad. The well fluid with high mineralization degree contains various corrosive media, corrosive microorganisms and the like, and is particularly rich in Cl-The corrosion rate of the sucker rod is greatly improved. Meanwhile, associated gas contains CO2、H2And S and other corrosive gases make the well fluid weakly acidic. As is well known, Cl remediation-、CO2And H2S corrosion has always been a worldwide problem in oil production engineering. And the friction between the sucker rod and the inner wall of the oil pipe can generate heat energy to activate the surface of the sucker rod, and the corrosion rate of the surface of the sucker rod can be greatly accelerated under the action of corrosive output liquid. In addition, the influence of sand content, the influence of wax deposition and scaling of oil wells and the influence of viscosity of produced liquid can promote the corrosion and eccentric wear of the surface of the sucker rod.
The research shows that: when the water content of the oil well is more than 74.02%, the produced fluid is changed into phase, and the oil-in-water type is changed from the water-in-oil type. The surface of the pipe rod loses the protection of crude oil, produced water directly contacts metal, and the corrosion speed is increased. The lubricant is changed from crude oil to produced water, the lubrication effect of the crude oil is lost, the specific gravity is increased while the water content of well fluid is increased, meanwhile, the lubrication coefficient of the contact surface of the pipe rod is greatly reduced, the uplink load is obviously increased, the downlink resistance is invisibly increased, the stress condition and the deformation degree of the sucker rod are aggravated, the friction resistance is increased, and the abrasion of the pipe rod is accelerated. The eccentric wear of the pipe rod can generate heat energy to activate the surface of the pipe rod, and under the action of strong corrosive output liquid, the eccentric wear part is preferentially corroded to increase the surface roughness and the wear resistance, so that the wear is more serious. In addition, the influence of sand content, the influence of wax deposition and scaling of oil wells and the influence of viscosity of produced liquid can promote the corrosion and eccentric wear of the surface of the sucker rod. Corrosion and mechanical wear do not simply add up, but interact, promoting each other, with the combination being more damaging. The oil field is widely applied to eccentric wear prevention measures such as a centralizer, an anti-wear pair, a weighting rod and the like, and although the service life of a pipe rod can be prolonged, the problems can not be thoroughly solved.
To anticorrosive wear-resisting difficult problem, the prevention and cure measure to the sucker rod taken at present has: the conventional methods of electroplating or chemical plating are mainly adopted to process chrome-plated sucker rods, nickel-plated sucker rods, tungsten-plated sucker rods, semi-coated anticorrosion wear-resistant sucker rods, fully coated anticorrosion wear-resistant sucker rods and the like. The conventional wear-resistant and corrosion-resistant coating of the sucker rod is limited by the large-diameter ratio of the rod head and the rod body of the upset sucker rod and the complex shape, the bonding strength of the coating and a substrate is low, and the coating is easy to peel, fall off and wear when used in the complex well condition environment to form a corrosion-resistant and wear-resistant short plate, so that the effect is not very ideal and the cost is not low; the spray welding coating and the matrix of the half-coated anticorrosion and wear-resistant sucker rod and the full-coated anticorrosion and wear-resistant sucker rod are greatly improved in bonding strength and have good anticorrosion and wear-resistant performances, but secondary solid-melt strengthening is needed after the spray welding of the anticorrosion alloy coating on the rod head, and the matrix performance of the coated anticorrosion and wear-resistant sucker rod head is substantially reduced at high temperature, so that the overall anticorrosion and wear-resistant performances and reliability of the sucker rod are substantially reduced, and the cost is high.
In order to solve the above technical problems, the applicant has been working on a series of improvements on the corrosion and abrasion resistance of sucker rods, such as the CN 108798537A-a corrosion-resistant and abrasion-resistant polish rod,
CN 108798538A-a series of china inventions, utility model and appearance design patents such as novel anticorrosive wear-resisting spray welding sucker rod, CN 210564384U-improved generation full cladding sucker rod base member, clamp and sucker rod, all overcome the anticorrosive wear-resisting difficult problem of sucker rod to a certain extent, and according to long-term experience of manufacturing and processing and use, under the prerequisite that can better solve above-mentioned technical problem, further reduction in production cost, shorten processing cycle, reduce manufacturing procedure and increase the life of sucker rod, consequently the utility model provides a novel sucker rod.
Disclosure of Invention
The utility model aims at providing a novel sucker rod aims at solving one of above-mentioned technical problem at least. The specific scheme is as follows:
a novel sucker rod comprises a sucker rod base body and a threaded sleeve, wherein two ends of the sucker rod base body are symmetrically arranged, and the sucker rod base body is sequentially provided with a first external thread joint, an unloading groove, a second external thread shoulder, a wrench square and a rod body from the end part to the center; the threaded sleeve is sleeved on the second external thread shoulder part of the sucker rod base body and partially coats the rod body.
Wherein an outer diameter of the first pin is smaller than an outer diameter of the second pin.
Wherein, the screw sleeve is provided with internal threads and is connected with the second external thread shoulder in a matching way.
And the end part of the second external thread shoulder, which is abutted against the threaded sleeve, is respectively provided with a thrust platform and a thrust port.
And a tool withdrawal groove is arranged between the thrust opening of the threaded sleeve and the internal thread.
The connecting part of the wrench side and the rod body is provided with a flange, and the outer diameter of the flange is smaller than that of the second external thread shoulder and larger than that of the wrench side.
The outer wall of the rod body is coated with an anticorrosive polymer plastic layer, and the outer surface of the threaded sleeve is provided with an anticorrosive wear-resistant coating.
Wherein, the threaded sleeve is made of stainless steel anticorrosive material.
And the part of the rod body, which is wrapped by the threaded sleeve, wraps and seals the rod body in an extrusion mode.
At least one groove is formed in the inner wall of the part, coated on the rod body, of the threaded sleeve.
The utility model provides a novel sucker rod, which can be more conveniently installed through the first external thread joint, the unloading groove, the second external thread shoulder, the wrench side and the rod body which are symmetrically arranged at the two ends of the sucker rod base body and the sealing connection with the thread sleeve, without the need of designating the installation direction; the threaded sleeve is coated on part of the rod body in an extruding mode, so that compared with the pressure glue injection technology in the prior art, the pressure glue injection technology is simpler and more attractive, has better sealing effect and lower cost, and is simpler and easier in processing procedure; stress borne by the connecting position of the sucker rod can be reduced by arranging the unloading groove, so that the connecting is more stable; the coating layer is formed on the outer surface of the rod body of the standard sucker rod by the working procedures of heating, middle-low pressure injection molding, curing and the like of the polymer plastic, so that the coating layer and the rod body are firmly combined together, and the possibility that a corrosive medium enters the coating layer is eliminated; the flange is arranged at the connecting part of the wrench side and the rod body, so that sufficient space can be ensured between the threaded sleeve and the sucker rod body and between the threaded sleeve and the injected polymer plastic, the end part of the threaded sleeve can be conveniently extruded to form a compact sealing effect with the rod body, and the compression-resistant, wear-resistant and corrosion-resistant effects can be realized; the partial inner wall through the screw sleeve cladding body of rod is provided with an at least recess, can make the polymer plastic layer fill the recess after the extrusion in, has both played sealed effect and has guaranteed its fastness again.
Drawings
FIG. 1 is a schematic structural view of a novel sucker rod according to an embodiment of the present invention;
FIG. 2 is a schematic structural view of a sucker rod base body of a novel sucker rod according to an embodiment of the present invention;
FIG. 3 is a schematic view of the sucker rod base body of a new sucker rod according to another embodiment of the present invention;
FIG. 4 is a schematic structural view of a threaded sleeve of a novel sucker rod according to an embodiment of the present invention;
labeled as: 1. the sucker rod comprises a sucker rod base body, 2 parts of a threaded sleeve, 3 parts of a first external thread joint, 4 parts of an unloading groove, 5 parts of a second external thread shoulder, 6 parts of a wrench square, 7 parts of a rod body, 8 parts of a thrust table, 9 parts of a flange, 10 parts of a thrust opening, 11 parts of a tool withdrawal groove and 12 parts of a groove.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
Referring to fig. 1-4, a novel sucker rod according to an embodiment of the present invention comprises a sucker rod base body 1 and a threaded sleeve 2, wherein both ends of the sucker rod base body 1 are symmetrically arranged, and the sucker rod base body 1 is sequentially provided with a first external thread joint 3, an unloading groove 4, a second external thread shoulder 5, a wrench 6 and a rod body 7 from the end to the center; the threaded sleeve 2 is sleeved on the second external thread shoulder 5 of the sucker rod base body 1 and partially covers the rod body.
It should be noted here that, the two ends of the sucker rod base body 1 are symmetrically arranged, so that the sucker rod base body is convenient for processing and production; secondly, for convenient assembling, the structures at both ends are the same, and the assembly does not need to appoint the direction, and is time-saving and labor-saving. First external thread joint 3 mainly used and butt joint (not shown in the figure) threaded connection assembly, because butt joint closely offsets with threaded sleeve 2 behind the 3 threaded connection of first external thread joint, realize sealed effect through the pretightning force, consequently the stress that reduces sucker rod base member 1 and receive can be played in the setting of off-load groove 4. The second external thread shoulder 5 is screwed to the threaded sleeve 2 and seals by cladding a portion of the shank.
It is emphasized that the outer diameter of the first pin 3 is smaller than the outer diameter of the second pin shoulder 5. This arrangement is convenient for the threaded sleeve 2 to be telescoped from the first pin 3, while the threaded sleeve 2 is provided with an internal thread and is in threaded connection with the second pin shoulder 5. The threaded connection can ensure the connection stability of the two and can also ensure the sealing property of the two.
On the basis of the above embodiment, according to the present invention, a new sucker rod is provided, as shown in fig. 2-4, wherein the end of the second external thread shoulder 5 abutting against the threaded sleeve 2 is respectively provided with a thrust platform 8 and a thrust port 10. Specifically, after second external thread circular bead 5 and threaded sleeve 2 threaded connection, through thrust mouth 10 of 8 butt of thrust platform, firstly the rotation between locking second external thread circular bead 5 and the threaded sleeve 2, secondly closely laminate behind thrust platform 8 and the thrust mouth 10 looks butt, realize sealedly.
Further, a relief 11 is provided between the thrust opening 10 of the threaded sleeve 2 and the internal thread. The tool withdrawal groove is more convenient and fast to process, stress concentration is effectively avoided, and the processing time cost is saved.
On the basis of the above embodiment, according to the present invention, a new sucker rod is provided, as shown in fig. 2-3, wherein the connecting portion between the wrench side 6 and the rod body 7 is provided with a flange 9. Concretely, add man-hour to sucker rod base member 1, carry out the rounding off of square corner turning to spanner side 6, flange 9 turning becomes flange transition platform, just so can ensure to have sufficient space between the threaded sleeve 2 and the sucker rod body of rod 7 and the polymer plastic, can conveniently realize the extrusion to the threaded sleeve, finally form closely knit closed effect to realize the wear-resisting anticorrosive effect of resistance to compression.
Further, the outer diameter of the flange 9 is smaller than the outer diameter of the second external thread shoulder 5 and larger than the outer diameter of the wrench side 6.
On the basis of above-mentioned embodiment, according to the utility model provides a novel sucker rod of another embodiment, the anticorrosive polymer plastic layer of outer wall cladding of the body of rod 7, threaded sleeve 2's surface sets up anticorrosive wear-resistant coating. Specifically, a coating layer is formed on the outer surface of the sucker rod body through the processes of heating, middle-low pressure injection molding, curing and the like of polymer plastic, so that the coating layer and the rod body are firmly combined together, and the possibility that corrosive media enter the coating layer is eliminated. The polymer plastic has high chemical stability, high toughness, certain wear resistance and self-lubricating property, and has the advantages of high mechanical strength, high toughness, high impact resistance, high fatigue resistance, smooth surface, low friction coefficient, high heat resistance (long-term use at 180 ℃), high corrosion resistance, light weight, easy forming and reliable dimensional stability. The rod body of the prior sucker rod is corroded because the rod body directly contacts a corrosive medium, if an anticorrosive coat is worn on the outer surface of the rod body of the sucker rod, the rod body of the sucker rod and the corrosive medium are isolated from each other and are not damaged by the corrosive medium, so that the problem that the sucker rod is not corroded in a corrosive environment is solved, and meanwhile, the high fatigue strength of the sucker rod is ensured.
The threaded sleeve 2 can be directly made of stainless steel anticorrosive materials or an anticorrosive wear-resistant coating can be arranged on the outer surface of the threaded sleeve 2, and the arrangement of the anticorrosive wear-resistant coating on the outer surface of the threaded sleeve refers to spray welding of nickel-based alloy powder on the surface of the threaded sleeve 2, so that the threaded sleeve has comprehensive performances of wear resistance, corrosion resistance, friction resistance reduction and the like. The special antifriction elements of the coating are uniformly transferred to the surface of the oil pipe in a sheet form in the eccentric wear process of the coating and the oil pipe and are attached to the surface of the oil pipe to form solid lubrication, protect and slow down the wear of the surface of the oil pipe, reduce the friction coefficient between the coating and the oil pipe and play a role in antifriction. In the actual processing production process, in order to prevent the occurrence of an emergency, for example, corrosive liquid enters the inside of the sleeve, an anti-corrosion wear-resistant coating or an anti-corrosion polymer plastic layer is usually arranged on the wrench side 6, the flange 9 and the rod body 7.
On the basis of the above embodiment, according to the present invention, a sucker rod is provided, as shown in fig. 1, wherein the portion of the threaded sleeve 2 covering the rod body 7 is sealed by covering the rod body 7 by extrusion. Specifically, after 2 covers of threaded sleeve established partial body of rod 7, the external diameter of the body of rod 7 is less than 2 internal diameters of threaded sleeve, extrudees the part of 2 cladding body of rod 7 of threaded sleeve at this moment, makes it warp behind the undergauge closely the laminating on the polymer plastic layer that 7 overcoat of the body of rod were established, and then realizes sealedly, prevents that corrosive liquid from corroding to body of rod 7 and 2 insides of threaded sleeve in getting into threaded sleeve 2.
Further, at least one groove 12 is formed on the inner wall of the part, wrapping the rod body, of the threaded sleeve 2. Specifically, through an at least recess 12 that sets up, can make the polymer plastic layer fill in recess 12 after the extrusion, both played sealed effect and guaranteed its fastness again.
In summary, according to the novel sucker rod provided by the present invention, the polymer plastic coating layer is formed on the outer surface of the rod body of the sucker rod, and then the sucker rod is tightly pressed and locked by the pretightening force; the multi-section sucker rod base body is connected with the external thread section through a standard spray welding coupling. The sucker rod external screw thread at sucker rod both ends can form a complete set and use standard spray welding (SM) coupling to connect, carries out standard spray welding coupling and closely knit locking clamp through the pretightning force and carries out strong extrusion sealing, can effectively prevent inside corrosive medium gets into the external thread pole head. One end of the threaded sleeve is extruded and coated on the sucker rod body, so that the purpose of corrosion prevention of the whole sucker rod body is achieved, the sucker rod is simple to process, low in cost, high in corrosion prevention, wear resistance and reliability, the service life of the sucker rod body can be prolonged, the well repairing operation cost of an oil well is reduced, and the economic benefit of the oil field is improved.
It should be noted that the above detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular is intended to include the plural unless the context clearly dictates otherwise. Furthermore, it will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in other sequences than those illustrated or otherwise described herein.
Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements explicitly listed, but may include other steps or elements not explicitly listed or inherent to such process, method, article, or apparatus.
Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may also be oriented in other different ways, such as by rotating it 90 degrees or at other orientations, and the spatially relative descriptors used herein interpreted accordingly.
In the foregoing detailed description, reference is made to the accompanying drawings, which form a part hereof. In the drawings, like numerals typically identify like components, unless context dictates otherwise. The illustrated embodiments described in the detailed description, drawings, and claims are not meant to be limiting. Other embodiments may be utilized, and other changes may be made, without departing from the spirit or scope of the subject matter presented here.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A novel sucker rod comprises a sucker rod base body and a threaded sleeve, and is characterized in that two ends of the sucker rod base body are symmetrically arranged, and the sucker rod base body is sequentially provided with a first external thread joint, an unloading groove, a second external thread shoulder, a wrench square and a rod body from the end part to the center; the threaded sleeve is sleeved on the second external thread shoulder part of the sucker rod base body and partially coats the rod body.
2. The novel sucker rod of claim 1 wherein the first male connector has an outer diameter less than the outer diameter of the second male shoulder.
3. The sucker rod of claim 1 wherein the threaded sleeve is internally threaded to mate with the second externally threaded shoulder.
4. The sucker rod of claim 3 wherein the ends of the second external thread shoulder abutting the threaded sleeve are provided with a thrust stop and a thrust stop, respectively.
5. The sucker rod of claim 4, wherein a relief groove is provided between the thrust opening and the internal thread of the threaded sleeve.
6. The sucker rod of claim 1, wherein the connection between the wrench and the rod body is provided with a flange having an outer diameter smaller than the outer diameter of the second external thread shoulder and larger than the outer diameter of the wrench.
7. The novel sucker rod of claim 1, wherein the outer wall of the rod body is coated with an anti-corrosion polymer plastic layer; and an anti-corrosion wear-resistant coating is arranged on the outer surface of the threaded sleeve.
8. The sucker rod of claim 1, wherein the threaded sleeve is made of stainless steel corrosion resistant material.
9. The sucker rod of any one of claims 1 to 8 wherein the portion of the threaded sleeve surrounding the rod body is sealed by extrusion.
10. The sucker rod of claim 9, wherein the threaded sleeve has at least one groove formed in a portion of the inner wall thereof surrounding the rod body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021081358.9U CN212454282U (en) | 2020-06-12 | 2020-06-12 | Novel sucker rod |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021081358.9U CN212454282U (en) | 2020-06-12 | 2020-06-12 | Novel sucker rod |
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| CN212454282U true CN212454282U (en) | 2021-02-02 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116220572A (en) * | 2023-03-01 | 2023-06-06 | 滨州伟创高分子材料股份有限公司 | Sucker rod coated with high polymer material and preparation method thereof |
| CN117846513A (en) * | 2024-03-06 | 2024-04-09 | 胜利油田胜机石油装备有限公司 | Airtight type electroplating anti-corrosion heat-insulation oil pipe |
-
2020
- 2020-06-12 CN CN202021081358.9U patent/CN212454282U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116220572A (en) * | 2023-03-01 | 2023-06-06 | 滨州伟创高分子材料股份有限公司 | Sucker rod coated with high polymer material and preparation method thereof |
| CN116220572B (en) * | 2023-03-01 | 2023-10-27 | 滨州伟创高分子材料股份有限公司 | Sucker rod coated with high polymer material and preparation method thereof |
| CN117846513A (en) * | 2024-03-06 | 2024-04-09 | 胜利油田胜机石油装备有限公司 | Airtight type electroplating anti-corrosion heat-insulation oil pipe |
| CN117846513B (en) * | 2024-03-06 | 2024-05-03 | 胜利油田胜机石油装备有限公司 | Airtight type electroplating anti-corrosion heat-insulation oil pipe |
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