A high-precision power diagram sensor that continuously pumps out light-resistant rod bending

Abstract

The invention discloses a high-precision power diagram sensor for resisting the bending of a light rod without stopping. During the test, the light rod is placed in a second opening, and the light rod is positioned by cooperating with a positioning block on the light rod through a positioning slot, and a handle bolt is screwed in until the top of the bolt abuts against the side wall of the light rod, so that the power diagram sensor can be clamped on the light rod. The whole process does not require stopping and clamping, and the operation is convenient and fast. By arranging an anti-deformation interference block, when the light rod is bent and twisted, the deformation is directly transmitted to the anti-deformation interference block, and will not be transmitted to the elastic sensing block, so that the force plate is free from interference from the bending and twisting deformation of the light rod, and the measurement accuracy is guaranteed. The force plate and the top surface of the elastic sensing block form an angle of 20°, and the extension direction of the force plate passes through the midpoint of the first circular through hole and the second circular through hole, so the load test sensitivity can be improved.

Description

Technical Field

[0001] The invention relates to the technical field of low-pressure testing of oil fields, and more particularly to a high-precision power diagram sensor that continuously pumps and resists light rod bending. Background Art

[0002] In the process of oilfield development and production, the performance diagram of the pumping well is the main theoretical basis for judging the actual working state of the oil well downhole pump, and the performance diagram information consists of two parameters: load and displacement. At present, the load test is usually completed by a column load sensor. During the test process, there are mainly the following shortcomings:

[0003] 1. During the test, it is necessary to stop pumping and clamp the column load sensor between the two clamping plates of the pumping unit suspension rope, which is complicated to operate and poses a safety hazard.

[0004] 2. Insufficient sensitivity and low test accuracy;

[0005] 3. The contact between the light rod and the donkey head can easily cause the light rod to bend and twist, affecting the test results.

[0006] The commonly used method for testing the displacement of another parameter in the power diagram is to use a wire-type displacement mechanism to measure the displacement, which has a complex structure and poor measurement stability.

[0007] Therefore, how to provide a power diagram sensor to overcome the deficiencies of the above sensors is a problem that those skilled in the art need to solve urgently. Summary of the invention

[0008] In view of this, the present invention provides a high-precision power diagram sensor that is resistant to light rod bending and does not require stopping to draw or punching during the test. The measurement results are not affected by the bending and twisting deformation of the light rod. The operation is simple and safe, with high sensitivity and good stability, and the measurement results are more accurate.

[0009] In order to achieve the above object, the present invention adopts the following technical solution:

[0010] A non-stop light-resistant rod bending high-precision work chart sensor, comprising: a shell, a cover, a load sensor, a main control board, a handle bolt, a laser distance sensor and a power supply;

[0011] The lower end of the shell has a first opening; the cover body is buckled on the outer side of one side of the shell, the load sensor and the main control board are arranged in the shell, and the laser distance sensor and the power supply are arranged in the cover body;

[0012] The load sensor includes an elastic sensing block, which is fixedly mounted on the inner wall of the shell and is provided with a second opening corresponding to the opening position of the shell, a positioning slot is provided on an inner side wall of the second opening, a threaded hole is provided on the other side wall of the second opening, and a through hole is provided at a corresponding position of the shell, a handle bolt passes through the through hole and is threadedly connected to the threaded hole, and a positioning protrusion extends from the inner side of the top wall of the second opening toward the opening side thereof; an opening slot penetrating through the two side surfaces is provided downward along the top surface of the elastic sensing block close to the handle bolt, two ends of the force-bearing plate are vertically connected to the two side walls of the opening slot, and a strain gauge is pasted on the surface of the force-bearing plate;

[0013] The strain gauge and the laser distance sensor are electrically connected to the main control board and the power supply respectively.

[0014] It can be known from the above technical scheme that compared with the prior art, the present invention discloses a high-precision power diagram sensor that can resist the bending of a light rod without stopping. During the test, the light rod is placed in the second opening, and the light rod is positioned by cooperating with the positioning slot and the positioning block on the light rod. The handle bolt is screwed in until the top of the bolt abuts against the side wall of the light rod, and the power diagram sensor can be clamped on the light rod. The whole process does not require stopping to pull out or punching the clip, and the operation is convenient and quick.

[0015] According to the present invention, a first circular through hole and a second circular through hole are provided on the elastic sensing block perpendicular to the second opening direction, the first circular through hole is connected to one end of the first strip hole, and the other end of the first strip hole extends to the second opening; the second circular through hole is connected to one end of the second strip hole, the second strip hole is horizontally arranged, and the other end extends toward the bottom end of the opening groove;

[0016] The force-bearing plate forms an angle of 20° with the top surface of the elastic sensing block, and one end away from the top surface of the elastic sensing block is close to the second circular through hole, and the extension direction of the force-bearing plate passes through the midpoint of the line connecting the centers of the first circular through hole and the second circular through hole.

[0017] The beneficial effect of adopting the above technical solution is that the force-bearing plate and the top surface of the elastic sensing block form an angle of 20°, and the extension direction of the force-bearing plate passes through the midpoint of the line connecting the centers of the first circular through hole and the second circular through hole, which can improve the load test sensitivity by more than 6%.

[0018] According to the present invention, it further comprises an anti-deformation interference block, wherein the anti-deformation interference block is embedded on a side wall inside the second opening, and a positioning slot is provided on a side of the anti-deformation interference block close to the second opening.

[0019] The beneficial effect of adopting the above technical solution is that during the test process, by setting the anti-deformation interference block, when the light rod is bent and twisted, the deformation is directly transmitted to the anti-deformation interference block and will not be transmitted to the elastic sensing block, thereby protecting the force plate from the interference of the bending and twisting deformation of the light rod, thereby ensuring the accuracy of the measurement.

[0020] According to the present invention, the width of the anti-deformation interference block along the axis direction of the first circular through hole is 4 mm.

[0021] The beneficial effect of adopting the above technical solution is that the contact area between the polished rod and the elastic sensing block is reduced, and the influence of the bending and twisting deformation of the polished rod on the elastic sensing block is further reduced.

[0022] According to the present invention, the positioning protrusion includes a first positioning protrusion and a second positioning protrusion, the first positioning protrusion is arranged near one end of the first strip hole, and the second positioning protrusion is arranged on a side of the second opening top wall away from the first strip hole.

[0023] The beneficial effect of adopting the above technical solution is that the positioning of the polished rod is more accurate. Usually, the diameter of the polished rod of the oil pump has various specifications, such as Φ19mm, Φ22mm, Φ25mm, Φ28mm, etc. When the diameter of the polished rod is ≦22Φmm, the first positioning protrusion is used in conjunction with the positioning groove and the spiral handle for positioning. When the diameter of the polished rod is >Φ22mm, the second positioning protrusion is used in conjunction with the positioning groove and the spiral handle for positioning.

[0024] According to the present invention, it further comprises a laser tube, which is installed in the cover body and is electrically connected to the laser ranging sensor and the power supply.

[0025] The beneficial effect of adopting the above technical solution is that when the power diagram sensor is installed on the light rod and the position deviation is large, the laser tube will issue a warning to remind the operator to reinstall and fix it to ensure that the installation positioning of the power diagram sensor is more accurate.

[0026] According to the present invention, an overload prevention limit opening is provided at one end of the second strip-shaped hole close to the opening groove on the elastic sensing block.

[0027] The beneficial effect of adopting the above technical solution is to prevent overload from damaging the elastic sensing block and the strain gauge.

[0028] According to the present invention, a wireless control device is further included. The wireless control device includes a remote controller and an antenna for sending and receiving signals. The antenna is installed in the cover and is electrically connected to the main control board.

[0029] The beneficial effect of adopting the above technical solution is that the power diagram sensor can be remotely controlled to perform measurements, which is convenient and safe. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0031] Figure 1 The accompanying drawing is a cross-sectional view of a non-stop pumping anti-light rod bending high-precision work diagram sensor provided by the present invention;

[0032] Figure 2 The accompanying drawing is a schematic structural diagram of an embodiment of a non-stop high-precision power diagram sensor for resisting light rod bending provided by the present invention;

[0033] Figure 3 The accompanying drawing is a schematic diagram of the circuit connection of a non-stop pumping anti-light rod bending high-precision work diagram sensor provided by the present invention;

[0034] Reference numerals:

[0035] 1. Shell;

[0036] 2. Cover body;

[0037] 3. load sensor, 31. elastic sensing block, 311. midpoint, 32. anti-deformation interference block, 33. positioning slot, 35. first circular through hole, 351. first strip hole, 36. positioning protrusion, 361. first positioning protrusion, 362. second positioning protrusion, 37. second circular through hole, 371. second strip hole, 372. overload prevention limit port, 38. force plate, 39. strain gauge;

[0038] 4. Main control board;

[0039] 5. Handle bolt,

[0040] 6. Laser ranging sensor;

[0041] 7. Power supply;

[0042] 8. Laser tube;

[0043] 9. Antenna. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] The embodiment of the present invention discloses a non-stop pumping light-resistant rod bending high-precision work diagram sensor, which is characterized by comprising: a housing 1, a cover 2, a load sensor 3, a main control board 4, a handle bolt 5, a laser distance sensor 6 and a power supply 7;

[0046] The lower end of the housing 1 has a first opening; the cover 2 is buckled on the outer side of one side of the housing 1, the load sensor 3 and the main control board 4 are arranged in the housing 1, and the laser distance sensor 6 and the power supply 7 are arranged in the cover 2;

[0047] The load sensor 3 includes an elastic sensing block 31, which is fixedly mounted on the inner wall of the housing 1 and is provided with a second opening corresponding to the opening position of the housing 1, a positioning slot 33 is provided on one inner side wall of the second opening, a threaded hole is provided on the other side wall of the second opening, and a through hole is provided at a corresponding position of the housing 1, through which the handle bolt 5 passes and is threadedly connected with the threaded hole, and a positioning protrusion 36 is extended from the inner side of the top wall of the second opening toward the opening side thereof; an opening slot penetrating through the two side surfaces is provided downwardly along the top surface of the elastic sensing block 31 near the handle bolt 5, and the two ends of the force-bearing plate 38 are vertically connected to the two side walls of the opening slot, and a strain gauge 39 is pasted on the surface of the force-bearing plate 38;

[0048] The strain gauge 39 and the laser distance sensor 6 are electrically connected to the main control board 4 and the power supply 7 respectively.

[0049] Advantageously, the power supply is 3.7V and also includes a constant voltage power supply circuit and a boost power supply circuit. The constant voltage power supply circuit is connected to the main control board 4 , and the boost power supply circuit is connected to the laser ranging sensor 6 .

[0050] According to an embodiment of the present invention, a first circular through hole 35 and a second circular through hole 37 are provided on the elastic sensing block 31 perpendicular to the second opening direction, the first circular through hole 35 is connected to one end of the first strip hole 351, and the other end of the first strip hole 351 extends to the second opening; the second circular through hole 37 is connected to one end of the second strip hole 371, the second strip hole 371 is horizontally arranged, and the other end extends toward the bottom end of the opening groove;

[0051] The force-bearing plate 38 forms an angle of 20° with the top surface of the elastic sensing block 31 , and one end away from the top surface of the elastic sensing block 31 is close to the second circular through hole 37 , and the extension direction of the force-bearing plate 38 passes through the midpoint 311 of the line connecting the centers of the first circular through hole 35 and the second circular through hole 37 .

[0052] like Figure 2As shown, the existing force diagram sensor force plate 38 is placed horizontally, the force plate 38 of the present invention forms an angle of 20° with the top surface of the elastic sensing block 31, the axial extension direction of the force plate 38 coincides with the midpoint 311, the straight-line distance from the force plate 38 to the midpoint 311 at an angle of 20° is set to L1, the straight-line distance from the original horizontally placed force plate 38 to the midpoint 311 is set to L2, and the vertical distance from the midpoint 311 to the axis of the light rod is set to L. When L remains unchanged, L1=L2 / sin20°=1.064*L2. Therefore, when L remains unchanged, the measurement sensitivity of the force plate 38 can be improved by about 6.4% after rotating 20° compared with the force plate 38 being placed horizontally.

[0053] According to one embodiment of the present invention, it also includes an anti-deformation interference block 32, which is embedded in a side wall of the second opening, and a positioning slot 33 is provided on a side of the anti-deformation interference block 32 close to the second opening. During the test, by setting the anti-deformation interference block 32, when the light rod is bent and twisted, the deformation is directly transmitted to the anti-deformation interference block 32, and will not be transmitted to the elastic sensing block 31, so that the force-bearing plate is free from interference caused by the bending and twisting deformation of the light rod, thereby ensuring the accuracy of the measurement.

[0054] Advantageously, the width of the anti-deformation interference block 32 along the axis direction of the first circular through hole (35) is 4 mm.

[0055] According to one embodiment of the present invention, the positioning protrusion 36 includes a first positioning protrusion 361 and a second positioning protrusion 362. The first positioning protrusion 361 is arranged at one end close to the first strip hole 351, and the second positioning protrusion 361 is arranged at a side of the second opening top wall away from the first strip hole 351. Usually, the diameter of the polished rod of the pumping unit has various specifications, such as Φ19mm, Φ22mm, Φ25mm, Φ28mm, etc. When the polished rod diameter is ≦Φ22mm, the first positioning protrusion 361 is used to cooperate with the positioning card slot 33 and the spiral handle 5 for positioning. When the polished rod diameter is >Φ22mm, the second positioning protrusion 362 is used to cooperate with the positioning card slot 33 and the spiral handle 5 for positioning.

[0056] According to one embodiment of the present invention, it also includes a laser tube 8, which is installed in the cover body 2. When the power diagram sensor is installed on the light rod and the position deviation is large, the laser tube 8 will issue a warning to remind the operator to reinstall and fix it to ensure that the installation positioning of the power diagram sensor is more accurate.

[0057] Advantageously, an anti-overload limit opening 372 is provided at one end of the second strip hole 371 close to the opening groove on the elastic sensing block 31 , so as to prevent the elastic sensing block 31 and the strain gauge 39 from being damaged due to overload use.

[0058] According to some embodiments of the present invention, a wireless control device is also included. The wireless control device includes a remote controller and an antenna 9 for sending and receiving signals. The antenna 9 is installed in the cover 2 and is electrically connected to the main control board 4. Remote control of the power diagram sensor for measurement can be achieved, which is convenient and safe.

[0059] Advantageously, the main control board 4 is an MCU (micro control unit); the remote controller is a handheld terminal, commonly a mobile phone, a palmtop computer, etc.

[0060] According to the present invention, a high-precision power diagram sensor for continuously pumping light-resistant rod bending has the following testing principle:

[0061] 1. After the development of the power diagram sensor is completed, the actual use conditions of the power diagram sensor at the test site are simulated on the calibration machine, and the sensor is calibrated to calibrate the relationship between the load applied to the light rod and the strain gauge 39.

[0062] 2. At the test site, the power diagram sensor is positioned and installed on the polished rod of the natural gas or oil collection equipment by means of the positioning slot 33, the spiral handle 5 and the positioning protrusion 36.

[0063] 3. The remote controller sends a start test command to the antenna 9, and the antenna 9 transmits the signal to the MCU (micro control unit) to start the power diagram test.

[0064] 4. Under the action of tension or pressure, the diameter of the light rod will change slightly according to the change of the load. The slight change of the light rod is amplified by the first deformation amplification groove 35 and the second deformation amplification groove 37 on the elastic sensing block 31, and then sensed by a Wheatstone bridge composed of four strain gauges 39 pasted on the force-bearing plate 38 to measure the change of the elastic sensing block 31. The load value of the light rod can be directly and accurately calculated based on the relationship formula obtained by calibration (if the light rod contacts the donkey head and bends and twists, its deformation will be transmitted to the anti-deformation interference block 32, and will not be transmitted to the elastic sensing block 31).

[0065] 5. The MCU (microcontroller unit) uses a digital 24-bit AD acquisition circuit to collect the strain output value of the strain gauge 39 and obtains the displacement value of the laser ranging sensor 6 through serial communication. The displacement value and the load value are collected simultaneously for one operation cycle of the pumping unit, and the data of the entire cycle is stored and transmitted to the remote controller through wireless communication. The remote controller draws the work diagram on the display screen according to the displacement value and the load value.

[0066] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0067] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A high-precision power diagram sensor for continuously pumping light-resistant rod bending, characterized in that: include: A housing (1), a cover (2), a load sensor (3), a main control board (4), a handle bolt (5), a laser distance sensor (6) and a power supply (7); The housing (1) has a first opening at the lower end; the cover (2) is buckled onto the outer side of a side of the housing (1); the load sensor (3) and the main control board (4) are arranged in the housing (1); and the laser distance sensor (6) and the power supply (7) are arranged in the cover (2); The load sensor (3) comprises an elastic sensing block (31), the elastic sensing block (31) is fixedly mounted on the inner wall of the shell (1), and is provided with a second opening corresponding to the opening position of the shell (1), a positioning slot (33) is provided on one inner side wall of the second opening, a threaded hole is provided on the other side wall of the second opening, and a through hole is provided at a corresponding position of the shell (1), the handle bolt (5) passes through the through hole and is threadedly connected to the threaded hole, and a positioning protrusion (36) extends from the inner side of the top wall of the second opening toward the opening side thereof; an opening slot penetrating through two side surfaces is provided downwardly along the top surface of the elastic sensing block (31) on one side close to the handle bolt (5), and two ends of a force-bearing plate (38) are vertically connected to two side walls of the opening slot, and a strain gauge (39) is adhered to the surface of the force-bearing plate (38); The strain gauge (39) and the laser distance sensor (6) are electrically connected to the main control board (4) and the power supply (7) respectively; The elastic sensing block (31) is provided with a first circular through hole (35) and a second circular through hole (37) perpendicular to the second opening direction; the first circular through hole (35) is connected to one end of the first strip hole (351), and the other end of the first strip hole (351) extends to the second opening; the second circular through hole (37) is connected to one end of the second strip hole (371), and the second strip hole (371) is arranged horizontally, and the other end extends toward the bottom end of the opening groove; The force-bearing plate (38) forms an angle of 20° with the top surface of the elastic sensing block (31), and one end away from the top surface of the elastic sensing block (31) is close to the second circular through hole (37), and the extension direction of the force-bearing plate (38) passes through the midpoint (311) of the line connecting the centers of the first circular through hole (35) and the second circular through hole (37); The power supply (7) is 3.7V and also includes a constant voltage power supply circuit and a boost power supply circuit. The constant voltage power supply circuit is connected to the main control board (4), and the boost power supply circuit is connected to the laser ranging sensor (6).

2. According to claim 1, a non-stop light-resistant rod bending high-precision power diagram sensor is characterized in that: It also comprises an anti-deformation interference block (32), the anti-deformation interference block (32) being embedded on a side wall inside the second opening, and the positioning slot (33) being arranged on a side of the anti-deformation interference block (32) close to the second opening.

3. The non-stop light-resistant rod bending high-precision power diagram sensor according to claim 2 is characterized in that: The width of the anti-deformation interference block (32) along the axial direction of the first circular through hole (35) is 4 mm.

4. The non-stop pumping anti-light rod bending high-precision work diagram sensor according to claim 2 is characterized in that: The positioning protrusion (36) comprises a first positioning protrusion (361) and a second positioning protrusion (362), wherein the first positioning protrusion (361) is arranged at one end close to the first strip-shaped hole (351), and the second positioning protrusion (362) is arranged at a side of the second opening top wall away from the first strip-shaped hole (351).

5. The non-stop pumping anti-light rod bending high-precision work diagram sensor according to claim 4 is characterized in that: It also includes a laser tube (8), which is installed in the cover body (2), and is electrically connected to the laser distance measuring sensor (6) and the power supply (7).

6. The non-stop pumping anti-light rod bending high-precision work diagram sensor according to claim 5 is characterized in that: An overload prevention limit opening (372) is formed at one end of the second strip-shaped hole (371) close to the opening slot on the elastic sensing block (31).

7. A non-stop light-resistant rod bending high-precision work diagram sensor according to any one of claims 3 to 6, characterized in that: It also includes a wireless control device, which includes a remote controller and an antenna (9) for sending and receiving signals. The antenna (9) is installed in the cover (2) and is electrically connected to the main control board (4).

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