CN117214026B - Experimental device and experimental method for researching deformation eccentric wear of sucker rod - Google Patents
Experimental device and experimental method for researching deformation eccentric wear of sucker rod Download PDFInfo
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- CN117214026B CN117214026B CN202311487476.8A CN202311487476A CN117214026B CN 117214026 B CN117214026 B CN 117214026B CN 202311487476 A CN202311487476 A CN 202311487476A CN 117214026 B CN117214026 B CN 117214026B
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- 238000002474 experimental method Methods 0.000 title claims abstract description 22
- 239000007788 liquid Substances 0.000 claims abstract description 81
- 238000004088 simulation Methods 0.000 claims abstract description 46
- 238000006073 displacement reaction Methods 0.000 claims abstract description 31
- 238000004519 manufacturing process Methods 0.000 claims abstract description 8
- 238000000034 method Methods 0.000 claims description 11
- 229910000831 Steel Inorganic materials 0.000 claims description 5
- 239000010959 steel Substances 0.000 claims description 5
- 230000000007 visual effect Effects 0.000 claims description 4
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 239000012530 fluid Substances 0.000 abstract description 3
- 238000005086 pumping Methods 0.000 description 8
- 238000004364 calculation method Methods 0.000 description 4
- 238000006386 neutralization reaction Methods 0.000 description 4
- 238000011160 research Methods 0.000 description 3
- 239000005341 toughened glass Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 238000009795 derivation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000013178 mathematical model Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention discloses an experimental device and an experimental method for researching deformation eccentric wear of a sucker rod, which belong to the technical field of sucker test equipment. The experimental method comprises the following steps: and (3) preparing liquid for simulating produced liquid, communicating the cylinder with a liquid supply system, adjusting a reciprocating system to drive the simulation rod to reciprocate, and further calculating the position of the eccentric wear point and the transverse eccentric wear displacement of the sucker rod in actual production. The invention can simulate the motion state of actual fluid and the rod column, observe the stress change of the simulated rod column and better study the eccentric wear phenomenon of the sucker rod.
Description
Technical Field
The invention belongs to the technical field of oil pumping test equipment, and particularly relates to an experimental device and an experimental method for researching deformation eccentric wear of an oil pumping rod.
Background
The stress state of a sucker rod string, which is one of the three pumping equipment components, is receiving a great deal of attention. The oil pumping rod has its top connected to the horsehead suspension point of the oil pumping unit via polished rod and its bottom connected to the oil pump, and the pumping unit has crank link mechanism turned into the pumping rod to reciprocate in the shaft via the horsehead.
As the oil field is produced into the middle and later stages, the water content of the oil field rises, and the abrasion between the oil pipe and the sucker rod is serious. Because of the eccentric wear of the sucker rod and the oil pipe, the sucker rod and the oil pipe become the main reasons for the production stagnation of the oil field at one time, and meanwhile, a series of oil field mining field gathering and transportation works are affected by the sucker rod and the oil pipe. And more serious is: the repairing period of the oil field well caused by eccentric wear of the sucker rod and the oil pipe is shortened gradually, so that the production cost of the oil field is increased sharply.
At present, the determination of the eccentric wear point of the sucker rod is mainly calculated by a method of a neutralization point, but the method can only determine the approximate position of the primary eccentric wear point, namely, the position below the neutralization point, but the specific position and the transverse displacement of the primary eccentric wear point cannot be calculated, in addition, the primary eccentric wear is actually influenced by the size of a well oil pipe, secondary eccentric wear can occur after the primary eccentric wear occurs, no related theory and experimental method is adopted for determining the secondary eccentric wear point, and only the secondary eccentric wear point above the neutralization point is found in the actual operation of an oilfield.
The existing eccentric wear position calculation method cannot be actually matched with the field, and the eccentric wear point position and the eccentric wear point displacement of the existing eccentric wear position calculation method can be greatly different for different types of sucker rod steel grades.
Therefore, the stress state of the slender rod column under the working condition is necessary to study through palm holding rod and tube bias grinding. At present, research on eccentric wear of the sucker rod is mainly carried out by mathematical model derivation and software simulation, and related experimental technology is lacked. In view of the above, the invention develops a device and a method for researching the deformation eccentric wear of the sucker rod in a shaft, intuitively characterizes the eccentric wear of the sucker rod by an experimental method, and accurately researches the deformation of the sucker rod.
Disclosure of Invention
The invention aims to provide an experimental device and an experimental method for researching the deformation eccentric wear of a sucker rod, and aims to solve the technical problems that in the prior art, the approximate position of a eccentric wear point of the sucker rod can only be determined through the calculation of a neutralization point, the eccentric wear point cannot be matched with the actual field, and related experiments are lacked.
In order to solve the technical problems, the invention adopts the following technical scheme:
the experimental device comprises a cylinder body for simulating an oil pipe and a simulation rod column for simulating the oil pumping rod, wherein a visual window is arranged on the front side of the cylinder body, a scale mark ruler is arranged on the side surface of the window from top to bottom, a liquid inlet hole is arranged at the bottom of the cylinder body, a liquid outlet hole is arranged at the top of the cylinder body, and liquid for simulating produced liquid can be conveyed into the cylinder body; the lower end of the simulation rod column extends into the cylinder body, and the upper end of the simulation rod column is connected with the reciprocating system and used for simulating the reciprocating motion of the sucker rod; the cylinder body and the reciprocating motion system are both arranged on the bracket, and the side surface of the bracket is provided with a eccentric wear measuring system for observing the eccentric wear position and the eccentric wear displacement of the simulation rod column; the simulation pole is detachably connected with the cylinder body and the reciprocating motion system.
Preferably, the support is of a frame structure and comprises a base, a support frame and a plurality of support posts, wherein the support posts are arranged between the base and the support frame, and the reciprocating motion system is arranged on the support frame on the upper part of the support frame; the bottom of the cylinder body is embedded in the supporting seat, and the supporting seat is arranged on the base of the bracket; the upper end of the cylinder body is arranged on a supporting arm in the middle of the bracket.
Preferably, the liquid inlet pipe at the liquid inlet hole penetrates through the side wall of the supporting seat, the liquid outlet hole is connected with the liquid outlet pipe, and the liquid inlet pipe and the liquid outlet pipe can be connected with a liquid supply system and are used for simulating the entry of produced liquid and the discharge of the oil pipe; valves are arranged on the liquid inlet pipe and the liquid outlet pipe.
Preferably, the reciprocating motion system comprises a linear motor, a rebound element and a dynamometer, wherein an output shaft of the linear motor is connected with the simulation pole through the dynamometer, the rebound element is arranged between a cross beam of the support frame and the movable beam, the linear motor is arranged on the top cross beam, and the dynamometer is arranged below the movable beam; the linear motor is connected with the motor controller, and different strokes and times of the simulated pole are controlled by the motor controller.
Preferably, the lower end of the simulation pole is connected with the clamp holder and penetrates into the barrel, the upper end of the barrel is embedded in the supporting arm, and the inner space of the barrel is larger than the movable area where the simulation pole is stressed and deformed.
Preferably, the eccentric wear amount measuring system comprises a computer, a camera and a mounting frame, wherein the camera is arranged on the upright post through the mounting frame, the camera is connected with the computer, and can observe the position of an eccentric wear point of the simulation pole in the cylinder through a window and measure the transverse eccentric wear displacement of the eccentric wear point on the simulation pole by combining a scale mark ruler.
Preferably, the window is made of transparent toughened glass, and the edge of the window can be embedded in the clamping groove on the side wall of the cylinder.
The invention also provides an experimental method for researching the deformation eccentric wear of the sucker rod, which comprises the following steps:
assembling the experimental device;
preparing liquid for simulating produced liquid, communicating a liquid inlet hole and a liquid outlet hole of the cylinder with a liquid supply system, and setting flow speed and flow rate according to experimental requirements;
adjusting the depth of the simulation rod column in the cylinder, adjusting a reciprocating motion system according to experimental requirements, and setting the amplitude and the frequency of the reciprocating motion of the simulation rod column;
starting a liquid inlet valve on the liquid inlet pipe, and starting a linear motor when the liquid flows out of the liquid outlet pipe, so that the simulated rod column starts to reciprocate;
the stroke and the stroke frequency of the linear motor are regulated, the stress born by the simulation pole and the position of the eccentric wear point in the cylinder body are measured, the stroke of the linear motor is gradually increased, the secondary eccentric wear point appears above the primary eccentric wear point under the influence of the size of the cylinder body, and the position of the secondary eccentric wear point and the stress change of the simulation pole at the moment are recorded;
after waiting for the set time, obtaining experimental data of longitudinal positions and transverse eccentric horizontal displacement of eccentric points of analog posts with different steel grades and sizes under different stroke, stroke times and stress conditions through a window and an eccentric amount measuring system;
after the experiment is finished, the power supply of the linear motor is turned off, the liquid in the cylinder is emptied, and the experimental device is cleaned;
the data of the sucker rod in actual production are calculated as follows:
actual first-order offset position:
actual secondary eccentric wear point location:
the maximum lateral eccentric displacement is:
minimum tubing diameter:
the inner diameter of the oil pipe under the safety coefficient is as follows:
wherein: l is the actual first-stage eccentric wear point position, m; s is the total length of the actual sucker rod, m;
ls is the position of the first-stage eccentric wear point measured experimentally, mm; la is the total length of the simulated pole in the experiment, mm;
l2 is the actual secondary eccentric wear point position, m; ls2 is the secondary eccentric wear point position measured experimentally, mm;
a is the maximum lateral eccentric displacement, mm; a1 is the maximum transverse eccentric displacement in the experimental process, mm;
m is the force when the maximum eccentric displacement is measured in the experimental process, and N is the force;
ds is the diameter of the sucker rod, mm; ds1 is the simulated stem diameter in the experiment, mm;
b is a safety factor, generally 1.5.
The beneficial effects of adopting above-mentioned technical scheme to produce lie in: compared with the prior art, the invention simulates the oil pipe and the rod column by the cylinder to simulate the sucker rod, and utilizes the liquid inlet and the liquid outlet on the cylinder to convey the liquid simulating the produced liquid to the inside of the cylinder; the reciprocating motion system drives the simulation rod column to lift so as to simulate the reciprocating motion of the sucker rod, and the eccentric wear position and the eccentric wear displacement of the simulation rod column are observed by the eccentric wear measuring system through the visual window on the front side of the cylinder body and the scale marks on the side surface of the window, so that the eccentric wear point position and the transverse eccentric wear displacement of the sucker rod in actual production are calculated. The invention can simulate the property and the motion state of the actual fluid and the motion state of the rod column so as to better simulate the motion process of the sucker rod in the oil pipe, and the whole device is visible and can intuitively observe the stress change of the sucker rod. According to the invention, the motion condition of the sucker rod in the actual shaft is simulated through the indoor experimental device, so that the eccentric wear phenomenon is better researched, and the support can be provided for site construction.
Drawings
The invention will be described in further detail with reference to the drawings and the detailed description.
FIG. 1 is a schematic diagram of an experimental apparatus for studying deformation bias wear of a sucker rod according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a partial wear gauge system in accordance with an embodiment of the present invention;
FIG. 3 is a schematic view showing the relative positions of the support and the upright in an embodiment of the present invention;
FIG. 4 is a line graph of the offset position and horizontal offset displacement of a sucker rod at various times during 1 stroke per minute in an embodiment of the present invention;
FIG. 5 is a line graph of the offset position and horizontal offset displacement of a sucker rod at various times during 2 strokes per minute in an embodiment of the present invention;
FIG. 6 is a line graph of the offset position and horizontal offset displacement of a sucker rod at various times during 3 strokes per minute in an embodiment of the present invention;
FIG. 7 is a line graph showing the offset point locations and horizontal offset displacements of a sucker rod at various times during 4 strokes per minute in an embodiment of the present invention;
in the figure: 1-sucker rod, 2-holder, 3-liquid discharge hole, 4-support arm, 5-cylinder, 6-bracket, 7-window, 8-scale mark ruler, 9-base, 10-liquid inlet hole, 11-support seat, 12-dynamometer, 13-rebound element, 14-linear motor, 15-motor controller, 16-mounting frame, 17-camera, 18-computer; 19-supporting columns, 20-cross beams and 21-movable beams; 22-upright posts.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention. In the following detailed description of the present invention, certain specific details are set forth in detail. However, for the part not described in detail, the present invention is also fully understood by those skilled in the art.
Furthermore, those of ordinary skill in the art will appreciate that the drawings are provided solely for the purposes of illustrating the objects, features, and advantages of the invention and that the drawings are not necessarily drawn to scale. Meanwhile, unless the context clearly requires otherwise, throughout the description and the claims, the words "comprise", "comprising", and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is, it is the meaning of "including but not limited to".
Referring to fig. 1, an experimental device for researching deformation eccentric wear of a sucker rod provided by the embodiment of the invention comprises a cylinder 5 for simulating an oil pipe and a simulation rod column 1 for simulating the sucker rod, wherein a visual window 7 is arranged on the front side of the cylinder 5, a scale mark ruler 8 is arranged on the side surface of the window 7 from top to bottom, a liquid inlet hole 10 is arranged at the bottom of the cylinder 5, a liquid outlet hole 3 is arranged at the top of the cylinder, and liquid simulating produced liquid can be conveyed into the cylinder; the lower end of the simulation rod column 1 extends into the cylinder 5, and the upper end of the simulation rod column 1 is connected with a reciprocating motion system and is used for simulating the reciprocating motion of the sucker rod; the cylinder 5 and the reciprocating system are both arranged on the bracket 6, and a eccentric wear measuring system is arranged on the side surface of the bracket 6 and used for observing the eccentric wear position and the eccentric wear displacement of the simulation pole 1; the simulation pole 1 is detachably connected with the cylinder 5 and the reciprocating system.
As a preferable structure, as shown in fig. 1, the support 6 is a frame structure, and includes a base 9, a support frame, and a plurality of struts 19, where the plurality of struts are disposed between the base 9 and the support frame, and the reciprocating system is disposed on the support frame above the support 6; the bottom of the cylinder body 5 is embedded in a supporting seat 11, and the supporting seat 11 is arranged on a base 9 of the bracket 6; the upper end of the cylinder 5 is arranged on the supporting arm 4 in the middle of the bracket 6. Wherein, the base provides the support to experimental apparatus is whole, and the support arm carries out the secondary to the barrel and fixes.
During concrete manufacturing, a liquid inlet pipe at the liquid inlet hole 10 penetrates through the side wall of the supporting seat 11, the liquid discharge hole 3 is connected with a liquid discharge pipe, and the liquid inlet pipe and the liquid discharge pipe can be connected with a liquid supply system and are used for simulating the entry of produced liquid and the discharge of the oil pipe; valves are arranged on the liquid inlet pipe and the liquid outlet pipe.
In one embodiment of the present invention, as shown in fig. 1, the reciprocating system includes a linear motor 14, a rebound member 13 and a load cell 12, wherein an output shaft of the linear motor 14 is connected to the analog pole 1 through the load cell 12, the rebound member 13 is disposed between a cross beam 20 and a movable beam 21 of the support frame, the linear motor 14 is disposed on a top cross beam 20, and the load cell 12 is disposed below the movable beam 21; the linear motor 14 is connected with the motor controller 15, and different strokes and times of the simulated pole 1 are controlled by the motor controller 15. Wherein, the beam 20 and the movable beam 21 are arranged up and down, and guide grooves for guiding the two ends of the movable beam are processed on the side faces of the support columns on the two sides of the beam. The linear motor provides power for the reciprocating motion of the simulation pole, the upper end of the simulation pole is connected with the movable beam through the dynamometer, and the simulation pole is driven to lift up and down through the linear motor.
During specific manufacturing, the lower end of the simulation pole 1 is connected with the clamp holder 2 and penetrates into the cylinder 5, the upper end of the cylinder 5 is embedded in the supporting arm 4, and the inner space of the cylinder 5 is larger than the movable area where the simulation pole 1 deforms under stress. At the same time, the height of the cylinder is greater than the maximum descent depth of the simulated stem.
In addition, the window 7 is made of transparent toughened glass, and the edge of the window 7 can be embedded in the groove on the side wall of the cylinder 5. During the preparation, the barrel only has diapire, left side wall, right side wall, back lateral wall, and the recess is opened to the inside relative face of left side wall, right side wall, and toughened glass window installs in the recess, and the scale mark chi is located on the front view face of right side wall, and the feed liquor hole is located left side wall lower part and is used for simulating the produced liquid and get into oil pipe, and the flowing back hole is located left side wall upper portion and is used for simulating the produced liquid of getting rid of.
In one embodiment of the present invention, as shown in fig. 2 and 3, the eccentric wear amount measuring system includes a computer 18, a camera 17 and a mounting frame 16, wherein the camera 17 is disposed on a stand 22 through the mounting frame 16, the camera 17 is connected to the computer 18, the camera 17 can observe the position of the eccentric wear point of the analog pole 1 in the cylinder 5 through the window 7, and measure the lateral eccentric wear displacement of the eccentric wear point on the analog pole 1 in combination with the scale mark ruler 8.
The invention also provides an experimental method for researching the deformation eccentric wear of the sucker rod, which comprises the following steps:
assembling the experimental device; preparing liquid for simulating produced liquid, communicating a liquid inlet hole and a liquid outlet hole of the cylinder with a liquid supply system, and setting flow speed and flow rate according to experimental requirements;
lowering the simulation pole to a designated depth in the cylinder, adjusting a reciprocating motion system according to experimental requirements, and setting the amplitude and frequency of the reciprocating motion of the simulation pole;
opening a liquid inlet valve on the liquid inlet pipe, and when the liquid flows out of the liquid outlet pipe, starting a motor power supply to start a linear motor so as to start reciprocating motion of the simulation pole;
the stroke and the stroke frequency of the linear motor are regulated, the stress born by the simulation pole and the position of the eccentric wear point in the cylinder body are measured, the stroke of the linear motor is gradually increased, the secondary eccentric wear point appears above the primary eccentric wear point under the influence of the size of the cylinder body, and the position of the secondary eccentric wear point and the stress change of the simulation pole at the moment are recorded;
after waiting for the set time, obtaining experimental data of longitudinal positions and transverse eccentric horizontal displacement of eccentric points of analog posts with different steel grades and sizes under different stroke, stroke times and stress conditions through a window and an eccentric amount measuring system;
and after the experiment is finished, the linear motor power supply is turned off, the liquid in the cylinder is emptied, and the experiment device is cleaned.
Through experimental results, the eccentric wear point positions and the transverse eccentric wear displacement of the simulated columns of different steel grades under different conditions can be measured, and as shown in fig. 4-7, the horizontal coordinate in the drawing is the vertical coordinate of the simulated column, and the vertical coordinate is the horizontal offset distance of the simulated column.
From the data obtained in fig. 4-7, the minimum tubing diameter for the eccentric wear of the sucker rod and the tubing inner diameter for the safety factor under different conditions can be calculated as follows:
actual first-order offset position:
actual secondary eccentric wear point location:
the maximum lateral eccentric displacement is:
minimum tubing diameter:
under the safety factorThe inner diameter of the oil pipe is as follows:
wherein: l is the actual first-stage eccentric wear point position, m; s is the total length of the actual sucker rod, m;
ls is the position of the first-stage eccentric wear point measured experimentally, mm; la is the total length of the simulated pole in the experiment, mm;
l2 is the actual secondary eccentric wear point position, m; ls2 is the secondary eccentric wear point position measured experimentally, mm;
a is the maximum lateral eccentric displacement, mm; a1 is the maximum transverse eccentric displacement in the experimental process, mm;
m is the force when the maximum eccentric displacement is measured in the experimental process, and N is the force;
ds is the diameter of the sucker rod, mm; ds1 is the simulated stem diameter in the experiment, mm;
b is a safety factor, generally 1.5.
The calculation results of the oil pipe inner diameter and the oil pipe inner diameter under the minimum oil pipe diameter and the safety coefficient under different conditions are shown in table 1:
in summary, the invention has the advantages of simple structure and convenient operation, can simulate the property and the motion state of actual fluid and the motion state of a rod column so as to better simulate the motion process of the sucker rod in the oil pipe, and the whole device is visible and can intuitively observe the stress change of the sucker rod. Compared with the prior art, the invention simulates the motion condition of the sucker rod in the actual shaft through the indoor experimental device, better researches the eccentric wear phenomenon and can provide support for site construction.
In the foregoing description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways other than those described herein, and persons skilled in the art will readily appreciate that the present invention is not limited to the specific embodiments disclosed above.
Claims (1)
1. An experimental method for researching deformation eccentric wear of a sucker rod is characterized by comprising the following steps:
assembling an experimental device: the experimental device comprises a barrel body for simulating an oil pipe and a simulation rod column for simulating a sucker rod, a visual window is arranged on the front side of the barrel body, a scale mark ruler is arranged on the side surface of the window from top to bottom, a liquid inlet hole is formed in the bottom of the barrel body, a liquid outlet hole is formed in the top of the barrel body, and liquid for simulating produced liquid can be conveyed into the barrel body; the lower end of the simulation rod column extends into the cylinder body, and the upper end of the simulation rod column is connected with the reciprocating system and used for simulating the reciprocating motion of the sucker rod; the cylinder body and the reciprocating motion system are both arranged on the bracket, and the side surface of the bracket is provided with a eccentric wear measuring system for observing the eccentric wear position and the eccentric wear displacement of the simulation rod column; the simulation pole is detachably connected with the cylinder body and the reciprocating system; the lower end of the simulation pole is connected with the clamp holder and penetrates into the barrel, the upper end of the barrel is embedded in the supporting arm, and the internal space of the barrel is larger than the movable area where the simulation pole is deformed under the force;
the support is of a frame structure and comprises a base, a support frame and a plurality of support posts, wherein the support posts are arranged between the base and the support frame, and the reciprocating motion system is arranged on the support frame at the upper part of the support frame; the bottom of the cylinder body is embedded in the supporting seat, and the supporting seat is arranged on the base of the bracket; the upper end of the cylinder body is arranged on a supporting arm in the middle of the bracket; the liquid inlet pipe at the liquid inlet hole penetrates through the side wall of the supporting seat, the liquid discharge hole is connected with the liquid discharge pipe, and the liquid inlet pipe and the liquid discharge pipe can be connected with a liquid supply system and are used for simulating the entry of produced liquid and the discharge of the oil pipe;
the reciprocating motion system comprises a linear motor, a rebound element and a dynamometer, wherein an output shaft of the linear motor is connected with the simulation pole through the dynamometer, the rebound element is arranged between a cross beam of the support frame and the movable beam, the linear motor is arranged on the top cross beam, and the dynamometer is arranged below the movable beam; the linear motor is connected with the motor controller, and different strokes and times of the simulated pole are controlled by the motor controller;
the eccentric wear measuring system comprises a computer, a camera and a mounting rack, wherein the camera is arranged on the upright post through the mounting rack, the camera is connected with the computer, and can observe the position of an eccentric wear point of a simulation pole in the cylinder through a window and measure the transverse eccentric wear displacement of the eccentric wear point on the simulation pole by combining a scale mark ruler;
preparing liquid for simulating produced liquid, communicating a liquid inlet hole and a liquid outlet hole of the cylinder with a liquid supply system, and setting flow speed and flow rate according to experimental requirements;
adjusting the depth of the simulation pole in the cylinder, adjusting a reciprocating motion system according to experimental requirements, and setting the amplitude and frequency of the reciprocating motion of the simulation pole;
starting a liquid inlet valve on the liquid inlet pipe, and starting a linear motor when the liquid flows out of the liquid outlet pipe, so that the simulated rod column starts to reciprocate;
the stroke and the stroke frequency of the linear motor are regulated, the stress born by the simulation pole and the position of the eccentric wear point in the cylinder body are measured, the stroke of the linear motor is gradually increased, the secondary eccentric wear point appears above the primary eccentric wear point under the influence of the size of the cylinder body, and the position of the secondary eccentric wear point and the stress change of the simulation pole at the moment are recorded;
after waiting for the set time, obtaining experimental data of longitudinal positions and transverse eccentric horizontal displacement of eccentric points of analog posts with different steel grades and sizes under different stroke, stroke times and stress conditions through a window and an eccentric amount measuring system;
after the experiment is finished, the power supply of the linear motor is turned off, the liquid in the cylinder is emptied, and the experimental device is cleaned;
the data of the sucker rod in actual production are calculated as follows:
actual first-order offset position:；
actual secondary eccentric wear point location:；
the maximum lateral eccentric displacement is:；
minimum tubing diameter:；
the inner diameter of the oil pipe under the safety coefficient is as follows:；
wherein: l is the actual first-stage eccentric wear point position, m; s is the total length of the actual sucker rod, m;
ls is the position of the first-stage eccentric wear point measured experimentally, mm; la is the total length of the simulated pole in the experiment, mm;
l2 is the actual secondary eccentric wear point position, m; ls2 is the secondary eccentric wear point position measured experimentally, mm;
a is the maximum lateral eccentric displacement, mm; a1 is the maximum transverse eccentric displacement in the experimental process, mm;
m is the force when the maximum eccentric displacement is measured in the experimental process, and N is the force;
ds is the diameter of the sucker rod, mm; ds1 is the simulated stem diameter in the experiment, mm;
b is a safety factor, and 1.5 is taken.
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