CN115012839A - Sucker rod and method for improving descending instability resistance and eccentric wear resistance - Google Patents
Sucker rod and method for improving descending instability resistance and eccentric wear resistance Download PDFInfo
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- CN115012839A CN115012839A CN202210628699.0A CN202210628699A CN115012839A CN 115012839 A CN115012839 A CN 115012839A CN 202210628699 A CN202210628699 A CN 202210628699A CN 115012839 A CN115012839 A CN 115012839A
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- sucker rod
- eccentric wear
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- resistance
- longitudinal reinforcing
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- 238000000034 method Methods 0.000 title claims abstract description 18
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 33
- 238000005086 pumping Methods 0.000 claims abstract description 19
- 239000003129 oil well Substances 0.000 claims description 21
- 239000012530 fluid Substances 0.000 claims description 17
- 230000005484 gravity Effects 0.000 claims description 9
- 238000013016 damping Methods 0.000 claims description 7
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 4
- 239000004917 carbon fiber Substances 0.000 claims description 4
- 239000002131 composite material Substances 0.000 claims description 4
- 239000006260 foam Substances 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 4
- 239000005060 rubber Substances 0.000 claims description 4
- 230000001133 acceleration Effects 0.000 claims description 3
- 239000011133 lead Substances 0.000 claims description 3
- 238000005452 bending Methods 0.000 abstract description 15
- 239000003921 oil Substances 0.000 description 22
- 238000005299 abrasion Methods 0.000 description 5
- 238000000605 extraction Methods 0.000 description 5
- 239000007788 liquid Substances 0.000 description 5
- 238000005265 energy consumption Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 210000002435 tendon Anatomy 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- 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
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (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 application discloses a sucker rod and a method for improving descending instability resistance and eccentric wear resistance. The hollow sucker rod comprises a hollow sucker rod pipe body and a longitudinal reinforcing lacing wire, and the hollow sucker rod pipe body and the longitudinal reinforcing lacing wire are designed in the application; the longitudinal reinforcing lacing wires are uniformly arranged on the inner side wall of the hollow sucker rod pipe body along the axial direction of the hollow sucker rod pipe body and are integrated with the hollow sucker rod pipe body into a whole; the integral structure of the longitudinal reinforcing tie bar and the hollow sucker rod pipe body has strong stability and can improve the bending resistance; by changing the geometric shape of the cross section of the longitudinal reinforcing tie bar, the bending modulus of the sucker rod is increased, the bending resistance of the sucker rod is enhanced, the instability of the sucker rod is reduced or eliminated, and the eccentric wear problem of a lower stroke rod pipe of the pumping unit is relieved.
Description
Technical Field
The disclosure relates to the technical field of mechanical oil extraction, in particular to a sucker rod and a method for improving downlink instability resistance and eccentric wear resistance.
Background
In the middle and later stages of oil field development, the eccentric wear phenomenon of a rod pipe of the oil pumping unit is increasingly serious, the eccentric wear causes frequent maintenance operation, the maintenance-free period is short, the maintenance operation cost is increased, the oil extraction cost is high, and the comprehensive benefit is low; the eccentric wear of the sucker rod pipe of the pumping unit has a plurality of reasons, the eccentric wear caused by the axial compression instability bending of the sucker rod in the descending process is the main eccentric wear form of the pumping unit well, when the sucker rod moves in the downstroke, the sucker rod below a neutral point is in a compression state, the unstable bending is easily generated due to the fact that the length-fineness ratio of the sucker rod is too large, the eccentric wear of the sucker rod and an oil pipe is caused, the problems of wax precipitation, oil thickening, sand production and the like of an oil well can cause the increase of the downward resistance of a plunger, the axial ballast of the sucker rod is increased, the unstable bending of the sucker rod is serious, and the eccentric wear phenomenon of the rod pipe is aggravated.
Aiming at the eccentric wear phenomenon of the sucker rod, the existing method of local centering of the sucker rod is usually adopted for treatment, for example, patent No. ZL200420001924.5, a certain number of centering devices are installed on the sucker rod, the abrasion of the sucker rod is reduced after the centering devices are installed, but the abrasion of an oil pipe is aggravated, and meanwhile, after the centering devices are installed, a liquid flow channel is reduced, the suction resistance is increased, the energy consumption of the oil pumping unit is increased, and the liquid production amount is influenced, so that the sucker rod and the method for improving the downward instability resistance and the eccentric wear resistance are provided, and the problems are solved.
Disclosure of Invention
In view of the above-mentioned deficiencies or inadequacies in the prior art, it would be desirable to provide a sucker rod and method that reduces the downward axial ballast of the sucker rod, reduces rod tubing eccentric wear, and improves the resistance to downward instability and eccentric wear.
In a first aspect, the present application provides a sucker rod for improving resistance to down-going instability and eccentric wear, comprising: a hollow sucker rod pipe body and a longitudinal reinforcing lacing wire;
the longitudinal reinforcing tie bars are uniformly arranged on the inner side wall of the hollow sucker rod pipe body along the axis direction of the hollow sucker rod pipe body and are of an integrated structure with the hollow sucker rod pipe body.
According to the technical scheme provided by the embodiment of the application, the longitudinal reinforcing lacing wires are parallel to the axial direction of the hollow sucker rod pipe body or are spirally arranged along the axial direction of the hollow sucker rod pipe body.
According to the technical scheme provided by the embodiment of the application, the number of the longitudinal reinforcing tie bars is at least 4.
According to the technical scheme provided by the embodiment of the application, the cross section of the longitudinal reinforcing tie bar is arc-shaped, cross-shaped, triangular, square, rectangular or trapezoidal.
According to the technical scheme provided by the embodiment of the application, the filling medium can be injected into the pipe body of the hollow sucker rod pipe body, and the filling medium is lead, carbon fiber, foam, composite material or rubber.
According to the technical scheme provided by the embodiment of the application, at least one through hole is formed in the hollow sucker rod tube body along the axial direction of the hollow sucker rod tube body.
In a second aspect, the present application is based on the method for improving the down instability resistance and the eccentric wear resistance of the sucker rod in the first aspect, the sucker rod comprises an oil pumping unit and an oil well pump, the output end of the oil pumping unit is provided with a polished rod, and the top end of the oil well pump is provided with a plunger; the method comprises the following steps:
obtaining the sucker rod;
calculating the descending eccentric wear critical point of the sucker rod;
and the sucker rod is arranged between the downward eccentric wear critical point and the plunger of the oil well pump.
According to the technical scheme provided by the embodiment of the application, the descending eccentric wear critical point of the sucker rod is calculated according to the following formula:
maximum fluid damping force generated by the well fluid as it flows through the plunger and traveling valve:
the gravity of the sucker rod at the eccentric wear critical point of the lower row:
F g ＝(ρ r -ρ L )×A g ×g×H×cosθ；
distance from descending eccentric wear critical point to plunger:
wherein:
F v the maximum fluid damping force generated when the well fluid flows through the plunger and the traveling valve;
nk is the number of the traveling valves;
AP is the plunger sectional area;
AV is the valve seat hole sectional area of the traveling valve;
mu is a valve hole flow coefficient;
s is the stroke length;
n is the number of strokes;
ρ L is the well fluid density;
g is the acceleration of gravity;
A g the sectional area of the sucker rod;
ρ r the density of the material of the sucker rod;
F g the gravity borne by the sucker rod at the critical point of the downward eccentric wear;
h is the distance from the descending eccentric wear critical point to the plunger;
and theta is the average well head angle of the oil well.
In conclusion, the technical scheme specifically discloses the sucker rod for improving the descending instability resistance and the eccentric wear resistance, and the sucker rod is provided with a hollow sucker rod pipe body and a longitudinal reinforcing lacing wire; the longitudinal reinforcing lacing wires are uniformly arranged on the inner side wall of the hollow sucker rod pipe body along the axial direction of the hollow sucker rod pipe body and are integrated with the hollow sucker rod pipe body into a whole;
the integral structure of the longitudinal reinforcing tie bar and the hollow sucker rod pipe body has strong stability and can improve the bending resistance; by changing the geometric shape of the cross section of the longitudinal reinforcing tie bar, the bending modulus of the sucker rod is increased, the bending resistance of the sucker rod is enhanced, the instability of the sucker rod is reduced or eliminated, and the eccentric wear problem of a lower stroke rod pipe of the pumping unit is relieved.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:
FIG. 1 is a schematic view of a sucker rod with improved resistance to down-flow instability and eccentric wear.
FIG. 2 is a schematic view of a cross-sectional structure of an arc-shaped longitudinal reinforcing rib of a sucker rod for improving the resistance to downward instability and eccentric wear.
FIG. 3 is a schematic view of a cross-sectional structure of a trapezoidal longitudinal reinforcing rib of a sucker rod for improving the resistance to downward instability and eccentric wear.
FIG. 4 is a schematic view of a cross-sectional structure of a square longitudinal reinforcing rib of a sucker rod for improving the descending instability resistance and the eccentric wear resistance.
FIG. 5 is a schematic view of a cross-sectional structure of a rectangular longitudinal reinforcing rib of a sucker rod for improving the resistance to downward instability and eccentric wear.
FIG. 6 is a schematic view of a cross-shaped longitudinal reinforcing rib cross-section structure of a sucker rod for improving the resistance to downward instability and eccentric wear.
FIG. 7 is a schematic view of a cross-sectional structure of a triangular longitudinal reinforcing rib of a sucker rod for improving the descending instability resistance and the eccentric wear resistance.
Fig. 8 is a schematic view of a hollow sucker rod.
FIG. 9 is a schematic view of a hollow sucker rod mechanism with a centralizer.
FIG. 10 is a schematic structural view of an embodiment of a sucker rod with improved resistance to down-flow instability and eccentric wear.
Reference numbers in the figures: 1. a hollow sucker rod tube body; 2. and (6) longitudinal reinforcing ribs.
Detailed Description
The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.
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 application will be described in detail below with reference to the embodiments with reference to the attached drawings.
The specific implementation mode is as follows:
the existing hollow sucker rod in the prior art is specifically shown in figure 8, the number 1 is a hollow sucker rod pipe body, the number 2 is a threaded joint and is a single-pipe structure, as the hollow sucker rod continuously moves up and down in an oil well, crude oil in the well is conveyed to the ground through an oil well pump, and as the difficulty of extraction increases, the extraction of high-condensation oil and thick oil can only be carried out by an electric heating extraction mode, therefore, some oil wells use the hollow sucker rod and extract oil from a horizontal oil well after a thermal cable penetrates into the hollow sucker rod, but in the process of extracting thick oil, the hollow sucker rod is influenced by the horizontal well, so when the hollow sucker rod is in a built-slope position in the well in practical use, the sucker rod can damage and break the sucker rod when the inner wall of the oil pipe moves, the cable in the pipe is burnt, and the water content of the current oil well rises, The eccentric wear of the pipe and the rod is aggravated, which affects the production of the oil well;
in order to solve the problem that the sucker rod is worn eccentrically and easy to break, a hollow sucker rod provided with a centralizer is derived in the prior art, as shown in fig. 9, a reference number 1 is a hollow joint, a reference number 2 is a hollow rod body, a reference number 7 is an inner cavity of the hollow rod, and a reference number 3 is the centralizer, a certain number of centralizers are sleeved outside the hollow sucker rod to achieve the purposes of centralizing, bending prevention and eccentric wear prevention of the sucker rod, but in the actual use process, the sucker rod provided with the centralizer can reduce the abrasion of the sucker rod body, but the abrasion phenomenon of an oil pipe is aggravated, and meanwhile, the flow channel is reduced, the suction resistance is increased, the energy consumption of the oil pumping unit is increased, and the liquid yield is influenced after the centralizer is installed;
it can be known from the above comprehensive analysis of the prior art that an external centralizing mode is always adopted for reducing the eccentric wear phenomenon of the sucker rod in the prior art, and a centralizing structure from the outside is often adopted at a hand-in angle, as shown in fig. 9, it is obvious that such an external centralizing mode cannot achieve the purpose of reducing the eccentric wear without influencing other functions of the device.
Example one
Please refer to fig. 1, which illustrates a sucker rod with improved resistance to downward instability and eccentric wear, comprising: a hollow sucker rod tube body 1 and a longitudinal reinforcing lacing wire 2;
the longitudinal reinforced lacing wires 2 are uniformly arranged on the inner side wall of the hollow sucker rod body 1 along the axis direction of the hollow sucker rod body 1 and are integrated with the hollow sucker rod body 1.
As shown in fig. 1, in this embodiment, the inner sidewall of the hollow sucker rod body 1 is provided with the longitudinal reinforcing tie bars 2 uniformly arranged along the axial direction of the hollow sucker rod body 1, and the hollow sucker rod body 1 and the longitudinal reinforcing tie bars 2 are of an integral structure, so that the longitudinal reinforcing tie bars 2 can effectively enhance the stability of the sucker rod, improve the bending resistance of the sucker rod, and effectively alleviate the eccentric wear problem of the sucker rod.
As shown in figure 1, the longitudinal reinforcing lacing wires 2 are arranged in parallel with the axial direction of the hollow sucker rod pipe body 1 or are spirally arranged along the axial direction of the hollow sucker rod pipe body 1.
As shown in fig. 1, the number of longitudinal reinforcing tendons 2 is at least 4.
As shown in fig. 2-7, the cross-sectional shape of the longitudinal reinforcing tie bar 2 is arc, cross, triangle, square, rectangle or trapezoid;
furthermore, the bending-resistant section coefficient of the sucker rod can be enhanced and the bending-resistant performance of the sucker rod can be enhanced by changing the section geometry of the sucker rod, and the bending-resistant coefficient of the device can be improved to 2-4 times of that of a solid sucker rod and 1-2 times of that of a hollow sucker rod. Greatly reduces or eliminates the instability of the lower stroke sucker rod of the pumping unit and greatly relieves the eccentric wear problem of the lower stroke sucker rod pipe of the pumping unit.
As shown in fig. 1, optionally, a filling medium can be injected into the hollow sucker rod tube body 1, and the filling medium is lead, carbon fiber, foam, composite material or rubber;
optionally, lead can be injected into the hollow sucker rod body 1, so that the weight of the device is increased, and the device can be used as a weighted sucker rod;
optionally, materials such as carbon fiber, foam, composite materials or rubber are injected into the hollow sucker rod body 1, so that the weight of the device in liquid in the well can be reduced, the suspension point load and the energy consumption are reduced, and the device can be used as a light sucker rod.
As shown in fig. 1, at least one through hole is arranged in the hollow sucker rod tube body 1 along the axial direction thereof for balancing the liquid phase pressure inside and outside the sucker rod cavity.
Example two
The embodiment provides a method for improving the anti-downlink instability eccentric wear capacity of a sucker rod on the basis of the first embodiment, and the sucker rod further comprises an oil pumping unit and an oil well pump as shown in fig. 10, wherein the output end of the oil pumping unit is provided with a polished rod, and the top end of the oil well pump is provided with a plunger; the method comprises the following steps:
obtaining the sucker rod;
calculating the descending eccentric wear critical point of the sucker rod;
and the sucker rod is arranged between the downward eccentric wear critical point and the plunger of the oil well pump.
In the embodiment, the sucker rod with improved descending instability resistance and eccentric wear resistance in the first embodiment is obtained;
calculating the descending eccentric wear critical point of the sucker rod;
the sucker rod with improved descending instability resistance and eccentric wear resistance is arranged between a descending eccentric wear critical point and a plunger of an oil well pump, one end of the sucker rod is connected with a polished rod of the oil pumping unit, and the other end of the sucker rod is connected with the plunger of the oil well pump;
optionally, a sucker rod capable of improving the resistance to downward instability and eccentric wear based on the first embodiment is arranged in the whole well bore of the rod-pumped well.
As shown in fig. 10, in the section where the downward eccentric wear is likely to occur, on the premise of not additionally increasing the sectional area of the rod string, the eccentric wear degree between the rod pipes is reduced by adopting a special sucker rod, the upper end of the special sucker rod is connected with a ground pumping unit, the bottom of the special sucker rod is connected with a reciprocating plunger pump, and the downward eccentric wear critical point of the sucker rod is calculated according to the following formula:
maximum fluid damping force generated by the well fluid as it flows through the plunger and traveling valve:
the gravity of the sucker rod at the eccentric wear critical point of the lower row:
F g ＝(ρ r -ρ L )×A g ×g×H×cosθ；
distance from descending eccentric wear critical point to plunger:
wherein:
F v the maximum fluid damping force generated when the well fluid flows through the plunger and the traveling valve;
n k the number of the traveling valves;
A P is the plunger cross-sectional area;
A V the sectional area of the valve seat hole of the traveling valve is the sectional area of the valve seat hole of the traveling valve;
mu is a valve hole flow coefficient;
s is the stroke length;
n is the number of strokes;
ρ L is the well fluid density;
g is the acceleration of gravity;
A g the sectional area of the sucker rod;
ρ r the density of the material of the sucker rod;
F g the gravity borne by the sucker rod at the critical point of the downward eccentric wear;
h is the distance from the descending eccentric wear critical point to the plunger;
theta is the average well inclination angle of the oil well;
furthermore, the maximum fluid damping force generated when the well fluid flows through the plunger and the traveling valve can also be obtained through the factory hydraulic characteristic data acquisition of the oil well pump, table look-up acquisition, acquisition of other empirical formulas or experimental determination.
Compared with the prior art, the structural design realizes the breakthrough of quality in the angle of the source of the sucker rod centralization, the sucker rod body is centralized from the outside, the centralization is changed into the anti-bending of the inside of the sucker rod body, the phenomenon of aggravation of the abrasion of an oil pipe caused by the external centralization is fundamentally solved, the flow channel is reduced, the pumping resistance is increased, the energy consumption of the oil pumping unit is increased, and the liquid production quantity is influenced.
The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by those skilled in the art that the scope of the invention herein disclosed is not limited to the particular combination of features described above, but also encompasses other arrangements formed by any combination of the above features or their equivalents without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.
Claims (8)
1. The utility model provides an improve sucker rod of anti down unstability and eccentric wear ability which characterized in that includes: a hollow sucker rod pipe body (1) and a longitudinal reinforcing lacing wire (2);
the longitudinal reinforcing tie bars (2) are uniformly arranged on the inner side wall of the hollow sucker rod body (1) along the axis direction of the hollow sucker rod body (1), and are of an integrated structure with the hollow sucker rod body (1).
2. The sucker rod of claim 1 with improved resistance to down-flow instability and eccentric wear, wherein: the longitudinal reinforcing tie bars (2) are parallel to the axial direction of the hollow sucker rod pipe body (1) or are spirally arranged along the axial direction of the hollow sucker rod pipe body (1).
3. The sucker rod of claim 1 with improved resistance to down-flow instability and eccentric wear, wherein: the number of the longitudinal reinforcing lacing wires (2) is at least 4.
4. The sucker rod of claim 1 with improved resistance to down-flow instability and eccentric wear, wherein: the cross section of the longitudinal reinforcing lacing wire (2) is arc, cross, triangle, square, rectangle or trapezoid.
5. The sucker rod of claim 1 with improved resistance to down-flow instability and eccentric wear, wherein: the hollow sucker rod is characterized in that a filling medium can be injected into the hollow sucker rod body (1), and the filling medium is lead, carbon fiber, foam, composite material or rubber.
6. The sucker rod of claim 1 with improved resistance to down-flow instability and eccentric wear, wherein: at least one through hole is arranged in the hollow sucker rod tube body (1) along the axis direction.
7. A method for improving the down instability resistance and eccentric wear resistance of the sucker rod according to any one of claims 1 to 6, wherein the sucker rod further comprises a pumping unit and an oil well pump, the output end of the pumping unit is provided with a polished rod, and the top end of the oil well pump is provided with a plunger; the method is characterized by comprising the following steps:
obtaining the sucker rod;
calculating the descending eccentric wear critical point of the sucker rod;
and the sucker rod is arranged between the downward eccentric wear critical point and the plunger of the oil well pump.
8. The method of claim 7, wherein the method comprises the steps of: calculating the descending eccentric wear critical point of the sucker rod according to the following formula:
maximum fluid damping force generated by the well fluid as it flows through the plunger and traveling valve:
the gravity of the sucker rod at the eccentric wear critical point of the lower row:
F g ＝(ρ r -ρ L )×A g ×g×H×cosθ；
distance from descending eccentric wear critical point to plunger:
wherein:
F v the maximum fluid damping force generated when well fluid flows through the plunger and the traveling valve;
n k the number of the traveling valves;
A P is the plunger cross-sectional area;
A V the sectional area of the valve seat hole of the traveling valve is the sectional area of the valve seat hole of the traveling valve;
mu is a valve hole flow coefficient;
s is the stroke length;
n is the number of strokes;
ρ L is the well fluid density;
g is the acceleration of gravity;
A g the sectional area of the sucker rod;
ρ r the density of the material of the sucker rod;
F g the gravity of the sucker rod at the downward eccentric wear critical point;
h is the distance from the descending eccentric wear critical point to the plunger;
theta is the average well angle of the well.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210628699.0A CN115012839A (en) | 2022-06-06 | 2022-06-06 | Sucker rod and method for improving descending instability resistance and eccentric wear resistance |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210628699.0A CN115012839A (en) | 2022-06-06 | 2022-06-06 | Sucker rod and method for improving descending instability resistance and eccentric wear resistance |
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| CN115012839A true CN115012839A (en) | 2022-09-06 |
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| CN202210628699.0A Pending CN115012839A (en) | 2022-06-06 | 2022-06-06 | Sucker rod and method for improving descending instability resistance and eccentric wear resistance |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116241192A (en) * | 2023-03-06 | 2023-06-09 | 大庆冬青技术开发有限公司 | Zero-instability oil extraction method for sucker rod |
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2022
- 2022-06-06 CN CN202210628699.0A patent/CN115012839A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116241192A (en) * | 2023-03-06 | 2023-06-09 | 大庆冬青技术开发有限公司 | Zero-instability oil extraction method for sucker rod |
| CN116241192B (en) * | 2023-03-06 | 2023-08-22 | 大庆冬青技术开发有限公司 | Zero-instability oil extraction method for sucker rod |
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