CN111451943A - Hollow sucker rod tensile force applying device and shot blasting method - Google Patents
Hollow sucker rod tensile force applying device and shot blasting method Download PDFInfo
- Publication number
- CN111451943A CN111451943A CN202010287888.7A CN202010287888A CN111451943A CN 111451943 A CN111451943 A CN 111451943A CN 202010287888 A CN202010287888 A CN 202010287888A CN 111451943 A CN111451943 A CN 111451943A
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- Prior art keywords
- sucker rod
- hollow sucker
- shot blasting
- rod
- hollow
- Prior art date
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Links
- 238000005422 blasting Methods 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 16
- 239000003921 oil Substances 0.000 claims description 17
- 230000001681 protective effect Effects 0.000 claims description 14
- 239000010720 hydraulic oil Substances 0.000 claims description 2
- 229910000831 Steel Inorganic materials 0.000 abstract description 5
- 239000010959 steel Substances 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 3
- 238000000605 extraction Methods 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 238000003475 lamination Methods 0.000 abstract 2
- 238000005265 energy consumption Methods 0.000 abstract 1
- 238000005728 strengthening Methods 0.000 abstract 1
- 239000002344 surface layer Substances 0.000 description 6
- 230000008878 coupling Effects 0.000 description 4
- 238000010168 coupling process Methods 0.000 description 4
- 238000005859 coupling reaction Methods 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 239000010410 layer Substances 0.000 description 3
- 238000003825 pressing Methods 0.000 description 3
- 229910000617 Mangalloy Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
- B24C1/10—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods for compacting surfaces, e.g. shot-peening
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
Abstract
The invention relates to the technical field of oil extraction machine manufacturing, in particular to a shot blasting method for a sucker rod. The device of the invention applies tensile force to the hollow sucker rod, performs shot blasting treatment under the condition of keeping the tensile state, can improve the surface lamination stress value of the hollow sucker rod and improve the shot blasting strengthening effect. The method is characterized in that: the hollow sucker rod, the plunger type hydraulic cylinder, the end nut, the bearing rod, the reducing straight-through and the like. According to the tension force applying device, the plunger type hydraulic cylinder applies tension force to the hollow sucker rod, the outer diameter of the device part is equal to or smaller than that of the hollow sucker rod, the requirement of the through type sucker rod shot blasting machine on the outer diameter is met, the device part is resistant to shot blasting treatment and can be repeatedly used. The hollow sucker rod bearing the tensile force is placed in the shot blasting machine for shot blasting treatment, so that higher surface lamination stress can be obtained, the requirement on shot blasting strength is reduced, and the time, the energy consumption and the steel shot loss are saved.
Description
Technical Field
The invention relates to the technical field of oil extraction machinery manufacturing, in particular to a shot blasting method for a sucker rod.
Background
The sucker rod is an important part of an oil extraction system of an oil pumping well, and the sucker rod is divided into a solid sucker rod and a hollow sucker rod. Hollow sucker rods are of two types, upset and welded. The sucker rod bears complex acting force in the working process, and the sucker rod is required to have high tensile strength and good fatigue resistance.
The shot blasting treatment is a sucker rod production and processing technique, in the shot blasting treatment process, a large number of steel shots impact the surface of the sucker rod at a high speed, so that the surface metal of the sucker rod is compacted, when the surface of the sucker rod is compacted, the metal extends to the periphery, the surrounding metal also extends under the compaction action, and a compression stress layer is formed on the surface of the sucker rod by mutual extrusion. After shot blasting treatment, a certain depth of compressive stress layer is formed on the surface layer of the sucker rod, and the fatigue resistance of the sucker rod with the compressive stress layer is greatly improved. The sucker rod is mainly stressed in the oil well along the axial direction, and the axial compressive stress can improve the fatigue resistance of the sucker rod.
Generally, the sucker rod is in a free state in shot blasting treatment, and the pressure stress formed on the surface layer of the sucker rod by shot blasting is equivalent in all directions. The pressure stress value with better effect is required to reach about 200MPa, which is difficult to realize by a common shot blasting machine. In order to reach the surface layer compressive stress value, the shot blasting arc height value needs to be increased, so that the requirement on the capacity of shot blasting equipment is increased, the power consumption and the steel shot damage are increased, and the shot blasting time is prolonged.
Disclosure of Invention
In order to solve the problems, the invention aims to provide a tensile force applying device and a shot blasting method for a hollow sucker rod, which can improve the surface layer compressive stress value of the sucker rod after shot blasting treatment, particularly the compressive stress value along the axial direction of the sucker rod.
The invention provides a hollow sucker rod tensile force applying device and a shot blasting method. The method is characterized in that: the hollow sucker rod (1), the plunger type hydraulic cylinder (2), the end nut (3), the bearing rod (4), the reducing straight through (5) and the like. One end connector (7) of the hollow sucker rod (1) is connected with the end nut (3) in a screwing mode, the other end connector is connected with the reducing straight-through internal thread (8) in a screwing mode, the reducing straight-through external thread (9) is connected with the first internal thread (17) in a screwing mode, the bearing rod (4) is arranged in the hollow sucker rod, when the plunger type hydraulic cylinder (2) is filled with hydraulic oil, the plunger (10) pushes the bearing rod (4), the other end of the bearing rod is blocked by the end nut (3), and pushing force is applied to the hollow sucker rod. Sending the hollow sucker rod into shot blasting equipment for shot blasting treatment in a tensile state;
the inner wall of one end of a cylinder body (11) of the plunger type hydraulic cylinder (2) is provided with a first internal thread (17) which is matched and screwed with the reducing straight-through external thread (9), the first internal thread (17) is also matched with a pressing ring (13), the pressing ring (13) is screwed in along the first internal thread (17) to press the guide sleeves 1(14), the sealing ring (15) and the guide sleeves 2 (16); the bottom of the plunger type hydraulic cylinder (2) is connected with a valve (18) and an oil way interface (19), and the bottom of the cylinder body is provided with a second internal thread which is matched and screwed with the protective cover (20);
the inner wall of the end nut (3) is provided with a third internal thread which is matched and screwed with the hollow sucker rod joint (7);
the inner wall of the reducing straight-through (4) is provided with a fourth internal thread which is matched and screwed with the hollow sucker rod joint; the reducing straight through (4) is screwed with a first internal thread of the plunger type hydraulic cylinder (2) through an external thread;
a bearing rod (4) is arranged in the hollow sucker rod (1); the outer diameter of the bearing rod (4) is smaller than the inner drift diameter of the hollow sucker rod (1), and the length of the bearing rod is larger than that of the hollow sucker rod;
the plunger type hydraulic cylinder (2), the end screw cap (3) and the reducing straight through (5) are all equal to or smaller than the outer diameter of the external thread shoulder (6). The invention also provides a shot blasting method of the hollow sucker rod under the condition of bearing tensile force, which comprises the following steps:
step 2, screwing a joint (7) at one end of the hollow sucker rod (1) with an end nut (3);
step 4, connecting an external hydraulic pump pipeline at an oil way interface (19);
step 5, starting an external hydraulic pump to charge oil into the oil cavity (12), wherein the termination hydraulic pressure is 30-45 MPa;
step 7, sending the hollow sucker rod in the state of applying the tensile force into a shot blasting machine for shot blasting treatment;
and 8, after shot blasting treatment, unscrewing the protective cover (20), unscrewing the valve (18), releasing hydraulic pressure, unscrewing the plunger type hydraulic cylinder (2) and the reducing straight through (5), unscrewing the reducing straight through (5) and connecting the hollow sucker rod joint, unscrewing the end nut (3), taking out the bearing rod (4), and completing shot blasting treatment of the hollow sucker rod in a state of applying tensile force. The detached plunger type hydraulic cylinder (2), the end screw cap (3), the force bearing rod (4), the reducing straight through hole (5), the protective cover (20) and the like can be continuously reused.
The invention has the beneficial effects that:
the hollow sucker rod, the plunger type hydraulic cylinder, the end nut and the reducing straight-through are mutually screwed through threads to form a reaction frame, the plunger type hydraulic cylinder is filled with liquid, and the plunger can apply proper thrust to the bearing rod so as to apply tension on the hollow sucker rod;
the outer diameters of the plunger type hydraulic cylinder, the end nut and the reducing straight-through are all equal to or smaller than the diameter of an external thread shoulder of the hollow sucker rod, the external thread shoulder of the hollow sucker rod and the position of the maximum outer diameter of the hollow sucker rod are mutually screwed to form a whole according to a standard SY/T5550 + 2012 hollow sucker rod, and the maximum outer diameter is not larger than the hollow sucker rod per se, so that the requirement of a through type sucker rod shot blasting machine on the outer diameter of an object to be shot can be met;
one end of the reducing straight-through internal thread is matched with the joint thread of the hollow sucker rod, and one end of the external thread is matched with the thread of the plunger type hydraulic cylinder. The diameter-variable straight-through is used, so that the plunger type hydraulic cylinder is suitable for hollow sucker rods of various models, the effect of expanding the diameter of the first internal thread is achieved, a space is provided for increasing the diameter of the plunger type hydraulic cylinder, and the thrust value of the plunger type hydraulic cylinder can be improved.
The valve and the oil way interface are positioned in the bottom cylinder body and are sealed by a protective cover, so that the valve and the oil way interface cannot be touched and damaged by steel shots during shot blasting treatment;
the plunger type hydraulic cylinder, the end screw cap, the bearing rod, the protective cover and the like are made of manganese steel, can resist the long-time impact of steel shots and can be repeatedly used; the surface layer and the inside of the hollow sucker rod which is exerted with pulling force are in an axial tensile stress state, shot blasting treatment is carried out in the state, the surface layer is easy to extend along the axial direction, after the shot blasting treatment is finished, the axial compressive stress value is improved after the tensile force is unloaded.
Drawings
FIG. 1 is a sectional view of the assembly of a tension force applying apparatus for a hollow sucker rod according to the present invention;
figure 2 is a cross-sectional view of the end nut.
FIG. 3 is a cross-sectional view of a hollow sucker rod.
Fig. 4 is a cross-sectional view of a reducing straight through.
Fig. 5 is a cross-sectional view of the plunger cylinder.
In the above figures, 1, a hollow sucker rod; 2. a plunger type hydraulic cylinder; 3. an end nut; 4. a force bearing rod; 5. reducing straight-through; 6. an external thread shoulder; 7. a joint; 8. reducing straight-through internal threads; 9. reducing straight-through external threads; 10. a plunger; 11. a cylinder body; 12. an oil chamber; 13. pressing a ring; 14. a guide sleeve 1; 15. a seal ring; 16. a guide sleeve 2; 17. a first internal thread; 18. a valve; 19. an oil line interface; 20. a protective cover.
Detailed Description
The technical solutions in the embodiments of the present invention are described in further detail below with reference to the drawings in the embodiments of the present invention.
The hollow sucker rod (1) is respectively screwed with the end screw cap (3) and the reducing straight-through (5) by threads;
the bearing rod (4) is arranged in the hollow sucker rod (1);
one end of the plunger type hydraulic cylinder (2) is screwed with the reducing straight-through (5) in a threaded manner, and the other end of the plunger type hydraulic cylinder is sealed at the port by a protective cover (20);
furthermore, a valve (18) and an oil way interface (19) are arranged at the bottom of the plunger type hydraulic cylinder (2), and the valve and the oil way interface are both positioned in a closed cavity formed by the cylinder body and the protective cover, so that the damage in the shot blasting process can be avoided;
the cylinder body (11) is extended to two ends in length and is provided with internal threads besides the function of the hydraulic cylinder body;
furthermore, in order to realize the screwing connection matched with the threads, the inner wall of the cylinder body (11) is provided with a first internal thread matched and screwed with the reducing straight through (5); a second internal thread matched and screwed with the protective cover (20) is arranged on the inner wall of the other end of the cylinder body;
a bearing rod (4) is inserted into the hollow sucker rod (1), the bearing rod is a metal slender rod, the outer diameter of the bearing rod is smaller than the inner drift diameter of the hollow sucker rod, the length of the bearing rod is larger than that of the hollow sucker rod, and after an end nut (3) and a reducing straight-through (5) are screwed with the hollow sucker rod, the bearing rod (4) can be abutted in the stroke of a plunger (10);
the standard SY/T5550-2012 hollow sucker rod provides a coupling connection type hollow sucker rod and a direct connection type hollow sucker rod, wherein both ends of the coupling connection type hollow sucker rod are provided with external threads, one end of the coupling connection type hollow sucker rod is screwed with an end nut (3), and the other end of the coupling connection type hollow sucker rod is screwed with a reducing straight-through pipe (5);
embodiment 2, the device for applying the tensile force to the hollow sucker rod according to the embodiment of the present invention is a direct connection type hollow sucker rod specified for a standard SY/T5550 and 2012 hollow sucker rod, wherein one end of the direct connection type hollow sucker rod is an internal thread, the other end of the direct connection type hollow sucker rod is an external thread, one end of the internal thread is screwed with a plug, and the other end of the internal thread is screwed with a diameter-variable straight-through; it will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (7)
1. A hollow sucker rod tensile force applying device and a shot blasting method are characterized in that: the hollow sucker rod (1) is connected with the end nut (3) in a screwing mode through a connector (7) at one end of the hollow sucker rod (1), connected with an internal thread of the reducing straight-through pipe (5) in a screwing mode through a connector (8) at the other end of the hollow sucker rod (1), and connected with the plunger hydraulic cylinder (2) in a screwing mode through an external thread (9) at the other end of the reducing straight-through pipe (5), the bearing rod (4) is placed in the hollow sucker rod, when the plunger hydraulic cylinder (2) is filled with hydraulic oil, the plunger (10) pushes the bearing rod (4), the other end of the bearing rod is blocked by the end nut (3), tension is applied to the hollow sucker rod, and the hollow sucker rod is sent to shot blasting equipment to be shot-blasted under the condition that the hollow sucker rod bears the.
2. The hollow sucker rod tension force applying device according to claim 1, characterized in that the plunger type hydraulic cylinder (2) is characterized in that one end of the cylinder body is provided with a first internal thread (17) which is matched and screwed with the reducing straight-through external thread (9), the bottom of the plunger type hydraulic cylinder (2) is connected with a valve (18) and an oil way interface (19), and the bottom of the cylinder body is provided with a second internal thread which is matched and screwed with the protective cover (20).
3. The hollow sucker rod tension force applying device according to claim 1, wherein the inner wall of the end nut (3) is provided with a third internal thread which is matched and screwed with the joint (7) of the hollow sucker rod.
4. The hollow sucker rod tension force applying device according to claim 1, wherein a fourth internal thread matched with and screwed with the hollow sucker rod joint is arranged on the inner wall of the reducing straight through (5), and the reducing straight through (5) is screwed with the first internal thread (17) through an external thread.
5. The hollow sucker rod tension force applying device according to claim 1, wherein a force bearing rod (4) is arranged in the hollow sucker rod (1), the outer diameter of the force bearing rod (4) is smaller than the inner diameter of the hollow sucker rod (1), and the length of the force bearing rod is larger than that of the hollow sucker rod.
6. The hollow sucker rod tension force applying device according to claim 1, wherein the plunger type hydraulic cylinder (2), the end nut (3) and the reducing straight through (5) all have outer diameters equal to or smaller than the outer diameter of the external thread shoulder (6).
7. The hollow sucker rod tension force applying device and the shot blasting method according to any one of claims 1 to 6, wherein the shot blasting method comprises the following steps:
step 1, inserting a bearing rod (4) into a hollow sucker rod (1);
step 2, screwing a joint (7) at one end of the hollow sucker rod (1) with an end nut (3);
step 3, connecting a reducing straight through (5) at the other end of the hollow sucker rod (1) in a screwing way, and connecting the plunger type hydraulic cylinder (2) at the other end of the reducing straight through in a screwing way;
step 4, connecting an external hydraulic pump pipeline at an oil way interface (19);
step 5, starting an external hydraulic pump to charge oil into the oil cavity (12), wherein the termination hydraulic pressure is 30-45 MPa;
step 6, closing the valve (18), dismantling an external hydraulic pump pipeline, and screwing on a protective cover (20);
step 7, sending the hollow sucker rod in the state of applying the tensile force into a shot blasting machine for shot blasting treatment;
and 8, after shot blasting treatment, unscrewing the protective cover (20), unscrewing the valve (18), releasing hydraulic pressure, unscrewing the plunger type hydraulic cylinder (2) to be connected with the reducing straight through (5), unscrewing the reducing straight through (5) to be connected with the hollow sucker rod joint, unscrewing the end nut (3), taking out the bearing rod (4), and completing shot blasting treatment of the hollow sucker rod in a state of applying tensile force. The detached plunger type hydraulic cylinder (2), the end screw cap (3), the force bearing rod (4), the reducing straight through hole (5), the protective cover (20) and the like can be continuously reused.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010287888.7A CN111451943B (en) | 2020-04-14 | 2020-04-14 | Hollow sucker rod tensile force applying device and shot blasting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010287888.7A CN111451943B (en) | 2020-04-14 | 2020-04-14 | Hollow sucker rod tensile force applying device and shot blasting method |
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| Publication Number | Publication Date |
|---|---|
| CN111451943A true CN111451943A (en) | 2020-07-28 |
| CN111451943B CN111451943B (en) | 2022-02-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010287888.7A Active CN111451943B (en) | 2020-04-14 | 2020-04-14 | Hollow sucker rod tensile force applying device and shot blasting method |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB609582A (en) * | 1945-04-18 | 1948-10-04 | Ford Motor Co | Improvements in or relating to the shot peening of metallic articles |
| US3489620A (en) * | 1967-03-01 | 1970-01-13 | United States Steel Corp | Method of processing sucker rods and resulting article |
| CN202061945U (en) * | 2011-03-30 | 2011-12-07 | 常州科恒炉业有限公司 | Stretching and straightening device for sucker rod |
| CN102615291A (en) * | 2012-03-15 | 2012-08-01 | 湘潭大学 | Prestress turning method for shaft parts and prestress turning device |
| JP2012159137A (en) * | 2011-01-31 | 2012-08-23 | Toyooki Kogyo Kk | Tension device |
| CN205297607U (en) * | 2016-01-18 | 2016-06-08 | 四川芙蓉集团实业有限责任公司 | Device is applyed to NPR constant -resistance stock pretightning force |
| JP2018178360A (en) * | 2017-04-03 | 2018-11-15 | 濱中ナット株式会社 | Contracting force introduction device for pc steel rod unit |
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-
2020
- 2020-04-14 CN CN202010287888.7A patent/CN111451943B/en active Active
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|---|---|---|---|---|
| GB609582A (en) * | 1945-04-18 | 1948-10-04 | Ford Motor Co | Improvements in or relating to the shot peening of metallic articles |
| US3489620A (en) * | 1967-03-01 | 1970-01-13 | United States Steel Corp | Method of processing sucker rods and resulting article |
| JP2012159137A (en) * | 2011-01-31 | 2012-08-23 | Toyooki Kogyo Kk | Tension device |
| CN202061945U (en) * | 2011-03-30 | 2011-12-07 | 常州科恒炉业有限公司 | Stretching and straightening device for sucker rod |
| CN102615291A (en) * | 2012-03-15 | 2012-08-01 | 湘潭大学 | Prestress turning method for shaft parts and prestress turning device |
| CN205297607U (en) * | 2016-01-18 | 2016-06-08 | 四川芙蓉集团实业有限责任公司 | Device is applyed to NPR constant -resistance stock pretightning force |
| JP2018178360A (en) * | 2017-04-03 | 2018-11-15 | 濱中ナット株式会社 | Contracting force introduction device for pc steel rod unit |
| CN208977620U (en) * | 2018-09-05 | 2019-06-14 | 东营市铁人抽油杆有限公司 | A kind of sucker rod shot-blasting machine |
| CN209477443U (en) * | 2019-02-27 | 2019-10-11 | 衢州飞瑞特种陶瓷有限公司 | Axial workpiece pre-stressed machining device |
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| CN111451943B (en) | 2022-02-08 |
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