CN212454283U - Novel sucker rod - Google Patents
Novel sucker rod Download PDFInfo
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- CN212454283U CN212454283U CN202021082573.0U CN202021082573U CN212454283U CN 212454283 U CN212454283 U CN 212454283U CN 202021082573 U CN202021082573 U CN 202021082573U CN 212454283 U CN212454283 U CN 212454283U
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Abstract
The invention relates to a novel sucker rod, which is characterized in that an external thread joint, an unloading groove, a conical shoulder, a wrench square and a rod body are symmetrically arranged at two ends of a sucker rod substrate and are in sealing connection with a conical sleeve; coating the conical sleeve on part of the rod body in an extruding manner; 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 part of the inner wall of the rod body which is coated by the conical 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 conical sleeve, wherein two ends of the sucker rod base body are symmetrically arranged, and the sucker rod base body is sequentially provided with an external thread joint, an unloading groove, a conical shoulder, a wrench square and a rod body from the end part to the center; the conical sleeve is sleeved on the conical shoulder part of the sucker rod substrate and partially coats the rod body.
Wherein the external diameter of the pin is smaller than the smallest external diameter of the tapered shoulder.
The conical sleeve is provided with an inner conical surface which is connected with the conical shoulder in a matching manner.
And the end part of the conical shoulder, which is abutted against the conical sleeve, is provided with a conical thrust platform and a conical thrust opening respectively.
And a flange is arranged at the connecting part of the wrench side and the rod body.
Wherein the outer diameter of the flange is smaller than the maximum outer diameter of the tapered shoulder and larger than the outer diameter of the wrench side.
The outer wall of the rod body is coated with an anti-corrosion polymer plastic layer, and the outer surface of the conical sleeve is provided with an anti-corrosion wear-resistant coating.
Wherein, the tapered sleeve is made of stainless steel anticorrosive material.
And the part of the rod body, which is wrapped by the conical sleeve, wraps and seals the rod body in an extrusion mode.
Wherein, the partial inner wall of tapered sleeve cladding the body of rod is provided with at least a recess.
The utility model provides a novel sucker rod, which can be more conveniently installed through the external thread joint, the unloading groove, the conical shoulder, the wrench square and the rod body which are symmetrically arranged at the two ends of the sucker rod base body and the sealing connection with the conical sleeve, without the need of appointing the installation direction; the conical 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 conical sleeve 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 conical sleeve and the sucker rod body and between the conical sleeve and the injected polymer plastic, the compact sealing effect can be conveniently realized between the conical sleeve and the rod body when the end part of the conical sleeve is extruded, and the compression-resistant, wear-resistant and corrosion-resistant effects can be realized; the partial inner wall through the cladding body of rod of tapered sleeve 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 structural view of a tapered sleeve of a sucker rod according to an embodiment of the present invention;
labeled as: 1. the sucker rod comprises a sucker rod base body, 2 conical sleeves, 3 external thread joints, 4 unloading grooves, 5 conical shoulders, 6 wrench squares, 7 rod bodies, 8 conical thrust platforms, 9 flanges, 10 conical thrust ports and 11 grooves.
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. 1-3, a novel sucker rod according to an embodiment of the present invention comprises a sucker rod base body 1 and a conical 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 an external thread joint 3, an unloading groove 4, a conical shoulder 5, a wrench 6 and a rod body 7 from the end to the center; the conical sleeve 2 is sleeved on the conical shoulder 5 of the sucker rod substrate 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. The external thread joint 3 is mainly used for being assembled with a butt joint (not shown in the figure) in a threaded connection mode, and the butt joint is tightly abutted to the conical sleeve 2 after being in threaded connection with the external thread joint 3, so that the sealing effect is achieved through the pre-tightening force, and the stress on the sucker rod base body 1 can be reduced due to the arrangement of the unloading groove 4. The conical shoulder 5 is connected with the conical sleeve 2 through pretightening force, and sealing is realized by wrapping part of the rod body.
It is emphasized that the external diameter of the pin 3 is smaller than the external diameter of the conical shoulder 5. The arrangement is convenient for the conical sleeve 2 to be sleeved in from the external thread joint 3, and the inner conical surface is arranged in the conical sleeve 2 and is connected with the conical shoulder 5 through pretightening force. The pretightening force connection can guarantee the connection stability of the pretightening force connection and the pretightening force connection, and can guarantee the sealing performance of the pretightening force connection.
On the basis of the above embodiment, according to the present invention, a new sucker rod is provided, as shown in fig. 2 and fig. 3, the end of the conical shoulder 5 abutting against the conical sleeve 2 is respectively provided with a conical thrust platform 8 and a conical thrust mouth 10. Specifically, the tapered thrust platform 8 and the tapered thrust opening 10 are tapered structures which are matched with each other, after the tapered shoulder 5 and the tapered sleeve 2 are connected through the pretightening force, the tapered thrust platform 8 abuts against the tapered thrust opening 10, the tapered shoulder 5 and the tapered sleeve 2 are locked through the pretightening force to prevent radial and circumferential displacement between the tapered shoulder and the tapered sleeve, and the tapered thrust platform 8 and the tapered thrust opening 10 are tightly attached through the pretightening force to realize sealing.
On the basis of the above embodiment, according to the present invention, a novel sucker rod is provided, as shown in fig. 2, wherein a flange 9 is provided at the connection portion between the wrench side 6 and the rod body 7. Concretely, add man-hour to sucker rod base member 1, carry out square corner turning rounding off to spanner side 6, flange 9 turning becomes flange transition platform, just so can ensure to have sufficient space between the awl type sleeve 2 and the sucker rod body of rod 7 and the polymer plastic, can conveniently realize the telescopic extrusion of awl type, 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 tapered shoulder 5 and larger than the outer diameter of the wrench end 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, the surface of tapered sleeve 2 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, impact resistance, fatigue resistance, smooth surface, small friction coefficient, long-term use at 180 deg.c, high corrosion resistance, light weight, easy formation and reliable size 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 conical sleeve 2 can be made of a stainless steel anticorrosive material directly or an anticorrosive wear-resistant coating can be arranged on the outer surface of the conical sleeve 2, and the arrangement of the anticorrosive wear-resistant coating on the outer surface of the conical sleeve means that nickel-based alloy powder is sprayed and welded on the outer surface of the conical sleeve 2, so that the conical sleeve has comprehensive properties 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 according to another embodiment is shown in fig. 1, the portion of the conical sleeve 2 covering the rod body 7 is sealed by covering the rod body 7 by extrusion. Specifically, after the partial body of rod 7 was established to the cover of tapered sleeve 2, the external diameter of the body of rod 7 was less than tapered sleeve 2's internal diameter, at this moment extrudees the part of the 2 cladding bodies of rod 7 of tapered sleeve, makes it warp closely the laminating on the polymer plastic layer that the overcoat of the body of rod 7 was established after the undergauge, and then realizes sealing, prevents that corrosive liquid from getting into in the tapered sleeve 2 and corroding to the body of rod 7 and the inside of tapered sleeve 2.
Furthermore, at least one groove 11 is formed in the inner wall of the part, wrapping the rod body, of the conical sleeve 2. Specifically, through an at least recess 11 that sets up, can make the polymer plastic layer fill in recess 11 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 conical 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 conical 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 an external thread joint, an unloading groove, a conical shoulder, a wrench square and a rod body from the end part to the center; the conical sleeve is sleeved on the conical shoulder part of the sucker rod substrate and partially coats the rod body.
2. The sucker rod of claim 1, wherein the external threaded connector has an outer diameter less than the minimum outer diameter of the tapered shoulder.
3. The sucker rod of claim 1 wherein the tapered sleeve has an inner tapered surface for mating engagement with the tapered shoulder.
4. The sucker rod as claimed in claim 3, wherein the end of the conical shoulder abutting against the conical sleeve is provided with a conical thrust platform and a conical thrust opening respectively.
5. The sucker rod of claim 1, wherein the connection between the wrench and the rod body is provided with a flange.
6. The sucker rod of claim 5 wherein the outer diameter of the flange is less than the maximum outer diameter of the tapered shoulder and greater than the outer diameter of the wrench.
7. The sucker rod of claim 1 wherein the outer wall of the rod body is coated with an anti-corrosive polymer plastic layer, and the outer surface of the tapered sleeve is provided with an anti-corrosive wear-resistant coating.
8. The sucker rod of claim 1, wherein the tapered sleeve is made of stainless steel.
9. The sucker rod of any one of claims 1 to 8 wherein the portion of the tapered sleeve surrounding the rod body is sealed by extrusion.
10. The sucker rod of claim 9, wherein the tapered sleeve is provided with at least one groove on a portion of the inner wall of the rod body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021082573.0U CN212454283U (en) | 2020-06-12 | 2020-06-12 | Novel sucker rod |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021082573.0U CN212454283U (en) | 2020-06-12 | 2020-06-12 | Novel sucker rod |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212454283U true CN212454283U (en) | 2021-02-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021082573.0U Active CN212454283U (en) | 2020-06-12 | 2020-06-12 | Novel sucker rod |
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Cited By (1)
| 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 |
-
2020
- 2020-06-12 CN CN202021082573.0U patent/CN212454283U/en active Active
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 |
| 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 |
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