CN101178001A - Super H-grade antiseptic smooth sucker rod - Google Patents
Super H-grade antiseptic smooth sucker rod Download PDFInfo
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- CN101178001A CN101178001A CNA2007101880066A CN200710188006A CN101178001A CN 101178001 A CN101178001 A CN 101178001A CN A2007101880066 A CNA2007101880066 A CN A2007101880066A CN 200710188006 A CN200710188006 A CN 200710188006A CN 101178001 A CN101178001 A CN 101178001A
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- sucker rod
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Abstract
The invention relates to an anticorrosion smooth sucker rod of super H grade, which is a flexible long rod. Two ends of the rod body are provided with external thread that can be connected with the coupling of the pumping rod. The outer surface of the smooth rod is coated with a layer of anticorrosion alloy coating. The rod body is made of low alloy steel; tensile strength of the smooth rod exceeds 1136MPa of H grade and fatigue strength reaches the standard of petroleum industry. The smooth rod is suitable for oil well requiring large load and with severe corrosive working environment; the service life of the long smooth rod is effectively prolonged and the development outlet of the oil well is improved.
Description
Technical field
The invention belongs to the oil equipment field, be specifically related to a kind of oil pumping polish rod.
Background technology
In petroleum industry, the oil pumper sucker rod pumping is a kind of artificial lift oil production method, and is simple with its equipment, small investment, and convenient management, advantage such as compliance is strong is extensively adopted by each oil field both at home and abroad.Oil pumper, sucker rod and oil well pump are three chief components of sucker rod pumping equipment, and wherein sucker rod is the motion and the transmission of power of oil pumper are carried out pumping to downhole pump parts.Oil pumping polish rod is the different sucker rod of rod string top one Gent, be used for and well head seal box fitted seal mouth of pumped oil well, therefore condition of work is more abominable than sucker rod, except that the condition of work of oil pumping polish rod, during upstroke in the exposed atmosphere in the open air, be immersed in during down stroke in the well liquid, therefore polished rod both had been subjected to atmospheric corrosion, be subjected to the well corrosion again, also to not bear high temperature when fuel-displaced, prestressing force that also will the side's of bearing clamp when hanging rod string bears the load tensile stress of the maximum that following all rod strings produce, and is the harshest different sucker rod of a Gent of condition of work.
At present domestic oil pumping polish rod is the same with sucker rod, is divided into C, K, D and H level from low to high according to different strength grades.Along with oil field development enters the middle and later periods, well depth increases gradually, load increases gradually, more and more higher to the mechanical property requirements of oil pumping polish rod.Though there are some superpower structural alloy steels can reach the level that tensile strength surpasses the H level at present, but because its fatigue strength can't reach the requirement of petroleum industry, can't satisfy the manufacturing of oil pumping polish rod, simultaneously, the oil extraction mode also changes polymer flooding, ternary composite driving into gradually from initial blowing, water drive, add viscous crude high temperature in addition and recover the oil, all aggravated corrosion failure effect oil pumping polish rod.Oil pumping polish rod causes with packing_seal not closely owing to corrosion causes the surface pitting corrosion to occur, causes leakage of oil, contaminated environment.The fatigue that corrosion failure effect has simultaneously aggravated oil pumping polish rod again reduces polished rod application life, causes polished rod to lose efficacy and stops well operations, lost units.
Summary of the invention
The purpose of this invention is to provide a kind of mechanical property and be higher than present industry existing standard maximum intensity rank H level, fatigue strength also reaches the super H-grade antiseptic smooth sucker rod that petroleum industry requires, and the oil pumping polish rod surface has anticorrosive wear-resistant and decreases coating, to prolong the application life of oil pumping polish rod under corrosive environment, by using this more high strength, more corrosion resistant oil pumping polish rod will effectively improve oil pumping polish rod service time, reduce accident rate, improve output.
For achieving the above object, the present invention takes following design scheme: a kind of super H-grade antiseptic smooth sucker rod is characterized in that it is a kind of flexible stock, there is the external screw thread that can be connected with rod collar at the two ends of the body of rod, be coated with one deck anticorrosive wear-resistant at the polished rod external surface and decrease alloy coat, described alloy coat comprises the component of following weight ratio: chromium 7%～10%, iron≤4%, silicon 2.0%～3.5%, boron 1.5%～2.5%, carbon≤0.4%, nickel 79.6%～85.1%; The used steel chemical composition of the body of rod according to percentage by weight is: carbon 0.07%～0.13%, silicon 0.40%～1.20%, manganese 1.60%～2.2%, chromium 0.60%～1.70%, molybdenum 0.20%～0.40%, nickel≤0.3%, copper≤0.20%, phosphorus≤0.025%, sulphur≤0.25%, surplus is an iron.
Each constituent content is definite as follows in the used steel of the body of rod:
Carbon: the super-strength sucker rod steel metallographic structure among the present invention mainly is bainite, ferrite and small portion of residual austenite, carbides-free exists mutually in the tissue, to avoid the pernicious effect of carbide to the bainitic steel mechanical property, thereby improve the mechanical property of bainitic steel, therefore the content of carbon is unsuitable too high, and carbon content is controlled in 0.07%～0.13% the scope among the present invention.
Molybdenum: molybdenum element does not almost influence bainite transformation because can effectively postpone high temperature transformation, so molybdenum is a bainite non-hardened and tempered steel alloying element commonly used.But costing an arm and a leg of molybdenum is from consider that economically reduce the content of molybdenum when design, molybdenum content is controlled in 0.20%～0.40% scope among the present invention as far as possible.
Manganese: manganese element mainly improves intensity by the solid solution carbon amount of solution strengthening effect, increase bainite, ferrite matrix.In addition, manganese and molybdenum are similar, can effectively postpone high temperature transformation.And manganese is quite cheap alloying element, has therefore added Gao Meng to reduce the consumption of molybdenum in steel.Manganese content is controlled in 1.60%～2.2% scope among the present invention.
Silicon: element silicon can hinder the formation of carbide strongly, makes steel not separate out (perhaps seldom separating out) carbide in the bainitic transformation process.In addition, silicon also is the essential element that improves yield strength.But excessive silicon reduces plasticity.The content of silicon is controlled in 0.40%～1.20% scope among the present invention.
Nickel: a spot of nickel element and manganese combine promptly can make steel easily produce bainite structure.The price of nickel is very high, considers from economic angle, uses nickel element less as far as possible.Among the present invention, nickel content≤0.3%
Chromium: the chromium element can improve the quenching degree of steel, and can make steel in cooling procedure the perlitic transformation district and bainite transformation distinguish from, help forming bainite.The content of chromium is controlled in 0.60%～1.70% the scope among the present invention.
The thickness of described alloy coat is 0.1mm～0.2mm.
Advantage of the present invention is:
1, super H-grade antiseptic smooth sucker rod of the present invention, its body of rod adopts low-alloy structural steel, makes body of rod tensile strength surpass the H level by Technology for Heating Processing and surface heat spraying coating process, and fatigue strength also reaches the petroleum industry standard simultaneously.Promptly under the certain situation of requirement of strength, use littler this kind oil pumping polish rod of diameter, can effectively reduce the oil pumper polished rod load; Perhaps under the very high situation of requirement of strength, use oil pumping polish rod of the present invention more safer than H level oil pumping polish rod.
2, the super H-grade antiseptic smooth sucker rod body of rod of the present invention surface is coated with one deck anticorrosive wear-resistant and decreases alloy coat.In the oil pumping polish rod course of work, this coating will have that the crude oil of corrosive medium and atmosphere and polished rod matrix are isolated to come, and make the bar matrix not be vulnerable to corrosion failure, thereby effectively prolong the application life of polished rod.
Description of drawings
Fig. 1 is a structural representation of the present invention
The specific embodiment
As shown in Figure 1, super H-grade antiseptic smooth sucker rod of the present invention, it is a kind of flexible stock, there is the external screw thread 1,4 that can be connected with rod collar at the two ends of the body of rod 3, one end of the body of rod 3 closes on the external screw thread place and has pier thick 5, be coated with one deck anticorrosive wear-resistant at the polished rod external surface and decrease alloy coat 2, the composition of alloy coat is a chromium 7%～10% according to percentage by weight, iron≤4%, silicon 2.0%～3.5%, boron 1.5%～2.5%, carbon≤0.4%, nickel 79.6%～85.1%;
The composition of the body of rod 3 matrix material low-alloy steel is carbon 0.07%～0.13% by weight percentage, silicon 0.40%～1.20%, manganese 1.60%～2.2%, chromium 0.60%～1.70%, molybdenum 0.20%～0.40%, nickel≤0.3%, copper≤0.20%, phosphorus≤0.025%, sulphur≤0.25%, surplus is an iron.The thickness of body of rod surface corrosion resisting alloy coating 2 is 0.1～0.2mm.If the thickness of corrosion-resistant finishes 2, then can not guarantee the normal wear consumption of oil pumping polish rod in the normal use age fully less than 0.1mm.
Embodiment one, and chemical component weight percentage is in the body of rod matrix low-alloy structural steel: carbon 0.07%, and silicon 0.40%, manganese 1.60%, chromium 0.60%, molybdenum 0.20%, nickel 0.3%, copper 0.20%, phosphorus 0.025%, sulphur 0.25%, surplus is an iron.Body of rod surface corrosion resisting alloy coating comprises the component of following weight ratio: chromium 7%, iron 1%, silicon 2.0%, boron 1.5%, carbon 0.1%, nickel 88.4%.
Embodiment two, and chemical component weight percentage is in the body of rod matrix low-alloy structural steel: carbon 0.13%, and silicon 1.20%, manganese 2.2%, chromium 1.70%, molybdenum 0.40%, nickel 0.3%, copper 0.20%, phosphorus 0.025%, sulphur 0.25%, surplus is an iron.Body of rod surface corrosion resisting alloy coating comprises the component of following weight ratio: chromium 10%, iron 4%, silicon 3.5%, boron 2.5%, carbon 0.4%, nickel 79.6%.
Embodiment three, and chemical component weight percentage is in the body of rod matrix low-alloy structural steel: carbon 0.08%, and silicon 0.50%, manganese 1.70%, chromium 0.90%, molybdenum 0.25%, nickel 0.2%, copper 0.15%, phosphorus 0.02%, sulphur 0.20%, surplus is an iron.Body of rod surface corrosion resisting alloy coating comprises the component of following weight ratio: chromium 8%, iron 1.5%, silicon 2.5%, boron 1.8%, carbon 0.15%, nickel 86.05%.
Embodiment four, and chemical component weight percentage is in the body of rod matrix low-alloy structural steel: carbon 0.11%, and silicon 1.10%, manganese 2.0%, chromium 1.50%, molybdenum 0.35%, nickel 0.27%, copper 0.17%, phosphorus 0.022%, sulphur 0.22%, surplus is an iron.Body of rod surface corrosion resisting alloy coating comprises the component of following weight ratio: chromium 9%, iron 3.4%, silicon 3.1%, boron 2.2%, carbon 0.34%, nickel 81.96%.
The preparation method of super H-grade antiseptic smooth sucker rod of the present invention comprises the following steps:
One, the preparation of low-alloy structural Steel Bar During: the prescription according to body of rod matrix low-alloy structural steel is smelted in electric furnace, molten steel is poured into the steel ingot of 560kg.Become 65mmX65mm through Φ 650X1 with Φ 650X3 mill milling
2Square embryo after, adopt cooling controlling and rolling controlling process by Φ 400X1 and Φ 250X5 tandem mill again: 1090 ℃ of heating-up temperatures, 900 ℃ of finishing temperatures, 3 ℃/s of cooling velocity becomes Φ 30 round steel with billet rolling, is cut into 9 meters scales, air cooling gets final product to room temperature.
Two, the preparation of super H-grade antiseptic smooth sucker rod blank: the low-alloy structural Steel Bar During that obtains is arrived oil pumping polish rod full-length 9.14m with the drawbench cold-drawn, utilize the GJ-A type sucker rod straightener of Huludao Bohai Petroleum Machinery Plant to carry out alignment again.Utilize the YSG-200 hydraulic double cylinder upsetter of the west of Liaoning, Huludao City oil facility factory to carry out the end jumping-up at the body of rod one end, use the C616 lathe that screw thread processing is carried out at the polished rod two ends then.
Three, the surface of super H-grade antiseptic smooth sucker rod spraying: at first, the polished rod blank is passed the induction coil of the KGPS-160KW/8KHZ type medium frequency induction heater of Shanghai China instrument induction heating equipment Co., Ltd production, the two ends of plunger are fixed on plunger fixedly on the lathe by connecting rod, the chuck that has internal thread, and plunger fixedly lathe has the tumbler and the mobile device that can drive polished rod; The speed with 19mm/s～21mm/s moves to allow plunger rotate in the heater coil of medium frequency induction heater vertically with 190 rev/mins～210 rev/mins speed then, in first time moving process, closing Medium frequency induction equipment does not heat the body of rod, using belt grinder to be pressed in the polished rod surface that axially-movable with the 80# abrasive band polishes one time from the beginning to the end to the polished rod body of rod, reduce the about 0.1～0.2mm of body of rod diameter dimension on the one hand and reserve the thickness that anticorrosive wear-resistant decreases alloy coat, alligatoring body of rod surface is to improve the adhesive power of hot spray powder on the other hand.After finishing the polishing alligatoring, open medium frequency induction heater, allow polished rod oppositely move, make the surface from top to terminal successively by the heater coil preheating of medium frequency induction heater one time, during preheating, the power output of medium frequency induction heater remains on 19KW～21KW, with the moisture of removing plunger surface and the temperature that improves plunger surface, increase powder adhesive bond rate, avoid too much powder to impinge upon the bounce-back loss that is caused on the cold workpiece, be about to the medium frequency induction heater power-off after the preheating one time; The model that the polished rod body of rod of stretching from the heater coil end after being heated is simultaneously produced with auspicious the spray coating mechanical Co., Ltd in Shanghai at once is that the corrosion resisting alloy powder is gone up in the metal dust spray gun spraying of QT-E20000-7/h, until the end that sprays to the polished rod body of rod, spraying is transported in the metal dust spray gun by air pump with alloy powder during spraying, and in the metal dust spray gun, mix the back with oxygen and acetylene and send from gun slot, the oxygen flow that wherein is transported to the metal dust spray gun is 0.39m
3/ h～0.41m
3/ h, acetylene flow are 0.79m
3/ h～0.81m
3/ h, the gas pressure of air pump are 0.023MPa～0.025Mpa; After polished rod body of rod terminal has been sprayed, the speed that the polished rod body of rod is being rotated in the heater coil of medium frequency induction heater vertically with 19mm/s～21mm/s with 190 rev/mins～210 rev/mins speed moves once more round about, and with the metal dust spray gun stopper rod body is sprayed second time; If having relatively high expectations, coating layer thickness sprays the 3rd time;
Four, the heat treatment of super H-grade antiseptic smooth sucker rod: after finishing spraying; close spray gun; open the KGPS-160KW/8KHZ type medium frequency induction heater that Shanghai China instrument induction heating equipment Co., Ltd produces; the polished rod body of rod is carried out the surface induction heating; the power output of medium frequency induction heater remains on 108KW～112KW; the coil of the relative medium frequency induction heater of the polished rod body of rod rotates and rectilinear motion; the velocity of rotation of polished rod is 145 rev/mins～155 rev/mins; translational speed vertically is 13mm/s～15mm/s, and it is mobile that powder is fully melted.In remelting, start the cooling water water pump, the water that is cooled through the supercooled water circle time of the polished rod body of rod after the remelting of stretching from heater coil is lowered the temperature rapidly.By axially-movable this time, polished rod has been finished face coat remelting and two technologies of body of rod heat treatment simultaneously, on the one hand, this sprayed coating forms metallurgical binding by remelting processing and plunger matrix material, the composition of coating and the composition of matrix be mutual scattering and permeating in reflow process, between coating and matrix material, there is certain thickness transition region, the composition that makes coating arrive matrix changes slow relatively, avoided forming the interface of composition sudden change, also problem with regard to having avoided the electrodeposited chromium coating after defective appears in the surface, to cause the coating sheet to come off because of the expansion of corrosion, on the other hand, the polished rod body of rod cools off rapidly again to high temperature by eddy-current heating and makes body of rod base material generation structural transformation, body of rod mechanical property surpasses existing sucker rod maximum intensity rank H level after testing behind the cool to room temperature, and promptly tensile strength surpasses the 1136Mpa of H level.
Five, polished rod polishing: finish remelting and the counter motion once more of heat treated polished rod, close Intermediate Frequency Induction Heating Equipment and water cooling equipment, open belt grinder and the polished rod surface finish is polished, make body of rod diameter reach standard-required with the 200# abrasive band.This moment, polished rod surface alloy coating layer thickness also reached 0.1mm～0.2mm scope, promptly obtained the super H-grade antiseptic smooth sucker rod finished product.
The mechanical property of each embodiment of super H-grade antiseptic smooth sucker rod sees Table one.
The mechanical property of each embodiment of table one super H-grade antiseptic smooth sucker rod
| Tensile strength sigma bMPa | Yield strength σ sMPa | Elongation rate δ s% | Contraction percentage of area ψ % | Ballistic work A kJ | Fatigue strength σ 0.1 | |
| SY/T5029-2003H grade pumping rod standard SY/T6272-1997 sucker rod fatigue strength standard | 966～1136 | 〉=865 | 〉=10 | 〉=50 | 〉=58.8 | Under the 540MPa sinusoidal wave load during load ratio R=0.1, circulation cycle 〉=1 * 10 6Inferior. |
| Embodiment one | 1640 | 1082 | 12.5 | 52.5 | 86 | 3.257 * 10 6 |
| Embodiment two | 1625 | 1091 | 16 | 54 | 89 | 4.126 * 10 6 |
| Embodiment three | 1610 | 1100 | 19.5 | 54.5 | 85 | 4.021 * 10 6 |
| Embodiment four | 1615 | 1094 | 14 | 51 | 79 | 3.635 * 10 6 |
Claims (2)
1. super H-grade antiseptic smooth sucker rod, it is characterized in that it is a kind of flexible stock, there is the external screw thread that can be connected with rod collar at the two ends of the body of rod, one end of the body of rod closes on the external screw thread place, and to have a pier thick, be coated with one deck anticorrosive wear-resistant at the polished rod external surface and decrease alloy coat, described alloy coat comprises the component of following weight ratio: chromium 7%～10%, iron≤4%, silicon 2.0%～3.5%, boron 1.5%～2.5%, carbon≤0.4%, nickel 79.6%～85.1%; The used steel chemical composition of the body of rod according to percentage by weight is: carbon 0.07%～0.13%, silicon 0.40%～1.20%, manganese 1.60%～2.2%, chromium 0.60%～1.70%, molybdenum 0.20%～0.40%, nickel≤0.3%, copper≤0.20%, phosphorus≤0.025%, sulphur≤0.25%, surplus is an iron.
2. super H-grade antiseptic smooth sucker rod according to claim 1 is characterized in that, the thickness of described alloy coat is 0.1mm～0.2mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101880066A CN101178001A (en) | 2006-11-21 | 2007-11-21 | Super H-grade antiseptic smooth sucker rod |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610114694 CN1952345A (en) | 2006-11-21 | 2006-11-21 | Super H anti-corrosion pumping polished rod |
| CN200610114694.7 | 2006-11-21 | ||
| CNA2007101880066A CN101178001A (en) | 2006-11-21 | 2007-11-21 | Super H-grade antiseptic smooth sucker rod |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101178001A true CN101178001A (en) | 2008-05-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007101880066A Pending CN101178001A (en) | 2006-11-21 | 2007-11-21 | Super H-grade antiseptic smooth sucker rod |
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|---|---|
| CN (1) | CN101178001A (en) |
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2007
- 2007-11-21 CN CNA2007101880066A patent/CN101178001A/en active Pending
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Open date: 20080514 |