Method for stand testing of natural samples of bars and bar models for fatigue strength

FIELD: testing equipment.

SUBSTANCE: method involves testing bar whose one end is fixed on stand and applying load to other end of bar through joining device; positioning one or several sensors for receiving of sound spectrum on bar; simultaneously applying constant and/or variable loads to bar end through joining device, direction of loads coinciding with axis of bar; providing diagnosis of measured sounds issued from tested bar for revealing appearance and development of fatigue cracks.

EFFECT: increased precision of test results.

15 cl, 1 dwg

 

The invention relates to oil-producing technique, and in particular to methods of bench tests of natural samples rods or models of rods on the fatigue strength for sucker rod pumps.

The known method of bench tests of natural samples rods or models of rods on fatigue strength, which allows to test the rod, which moves progressively in the center of the cavity between the three seekers /Devices for non-destructive testing of materials and products. The Handbook. Ed. by V.V. Klyuev - Vol.2. - M., engineering, 1976. - S-231./.

The disadvantage of this method is that it does not allow to investigate rod running under load.

The closest in technical essence and the achieved result to the declared object is a method of bench tests of natural samples rods or models of rods on fatigue strength, allowing you to experience the bar, which has one end fixed to the stand, and the other through the connecting unit is a load in which the rod installing the strain gages, through the coupling rod end load torque, and measure the resulting torsional deformation /Measurement in industry. The Handbook. Under the editorship of Proposa P. - Vol.2. Measurement techniques and apparatus. - M.: metallurgy, 1990. - P.124-129/.

Nedostatki the known method is weak similarity to real loads, occurs when the rods in the composition of sucker rod pumps.

The present invention is aimed at providing bench tests rods in conditions that are closest to those that arise when the rods with the composition of sucker rod pumps.

This is achieved by the fact that in the way of bench testing of natural samples rods or models of rods on fatigue strength, allowing you to experience the bar, which has one end fixed to the stand, and the other through the connecting unit is a load, while on the rod establish one or more sensors receive spectral noise, through the connecting device at the end of the rod serves at the same time constant and/or variable load, the direction of which coincides with the axis of the rod, measured noise emanating from the test rod, spend their diagnosis to detect the emergence and development of fatigue cracks, and the test rod can to be worn one or two clutches. In addition, in some cases, the value of a constant load can be chosen equal to the weight of the column of rods and equipment for the simulated rod columns. In addition, in some cases, the direction, amplitude, period and frequency of the variable load can be chosen equal to a variable load acting on the simulated rod colon is s. In addition, in some cases on the simulated rod can act constant and/or variable lateral load directed at an angle from 0° to 90° to the axis of the rod. In addition, in some cases, the lateral load can be applied in the most intense place of the rod. In addition, in some cases via a docking device on the rod may be filed torque. In addition, in some cases, the load on the test rod can be chosen to be equal loads on the upper rod. In addition, in some cases, a constant load on the rod can be selected in the range from zero to load the gap. In addition, in some cases, the load on the rod can be selected from conditions provide the accelerated equivalent tests. In addition, in some cases, the test rod can be placed, for example on the coupling portion of the tubing, with the axis of the rod and tubing are not necessarily the same. In addition, in some cases, part worn tubing can perform reciprocating motion. In addition, in some cases, wearing part of the tubing can be bent. In addition, in some cases, the amplitude and/or frequency of movement of the part of the tubing into which is inserted the States who ha can be equal to the amplitude and/or frequency of the actual movement of the rod string. In addition, in some cases, the amplitude and/or frequency of movement of the part of the tubing can be selected according to the equivalent accelerated tests. In addition, in some cases, the stand may be a part of the rod. In addition, in some cases, the stand can be installed multiple series-connected rods. In addition, in some cases, the test rod can perform a reciprocating movement.

Installation on the rod one or more sensors receive spectral noise allows one to register the noise in the tested rod.

Flow through the expansion device at the end of the rod at the same time constant and/or variable loads, the direction of which coincides with the axis of the rod, allows modeling at the stand of the actual load acting on the rod (the weight of the suspended equipment and column bars - constant load, the load arising from the reciprocating movement of the rod - variables).

Measurement of noise emanating from the test rod, allows for the conduct of their diagnosis to identify the emergence and development of fatigue cracks.

Execution rod equipped with one or two clutches (to the ends of the test rods are screwed one is whether the two clutches, allows you to more fully simulate the real rod of the string.

The choice of a value for a constant load equal to the weight of the column of rods and equipment for the simulated rod column allows you to more fully simulate a constant load on the bar.

Select the direction, amplitude, period and frequency of the variable load equal to variable load acting on the simulated rod columns, allows for more comprehensive model variable load on the bar.

The effect on the simulated arm is constant and/or variable lateral load directed at an angle from 0° to 90° to the axis of the rod, allows you to more fully simulate lateral forces (for example, due to friction on the string of tubing) on the bar.

The application of the lateral load in the most intense place rod allows you to more fully evaluate the effect of side loads.

Flow through the expansion device on the rod torque allows to take into account the torque acting on the rod, and to apply the results obtained to drive the screw pumps.

The choice of loads on the test rod is equal to the load on the top bar allows you to simulate the most hard rod columns.

The choice of the constant load on the rod in the range from zero to load the gap allows you to test for constant the th load in the entire possible range.

The choice of loads on the rod of the conditions for accelerated equivalent test allows to reduce the test time.

Putting on the test rod, for example on the clutch part of the tubing, with the axis of the rod and tubing are not necessarily the same, allows to simulate the friction rod on tubing - load 8T rod is extended by 4 mm or more (depending on the material, diameter, coating and so on).

Committing part worn tubing reciprocating motion allows you to more fully simulate the work of a rod.

Execution curved worn part of the tubing allows you to more fully simulate the friction rod on tubing.

Equality of amplitude and/or frequency of movement of the part of the tubing into which is inserted the rod, and the amplitude and/or frequency of motion of a real rod column allows you to more fully simulate the work of a rod.

The choice of amplitude and/or frequency of movement of the part of the tubing according to the equivalent accelerated testing can reduce the test time.

Installing the stand part of the rod reduces the size of the stand.

Installing the stand multiple series-connected rods allow yet more fully simulate the operation of the column bars.

Performing the test rod reciprocating motion allows you to more fully simulate the operation of the rods.

The way of bench testing of natural samples rods or models of rods on fatigue strength is as follows.

Selected rod for testing. To the ends of the rod depending on the conditions can be screwed one or two clutches. One end of the rod is attached to the stand, and the other through the connecting device is connected with the load device. After this rod is provided with one or more sensor noise. Through the docking device on the rod begins to be supplied to the load from the load device. Supplied to the load has a constant and/or variable components, and direction coincides with the axis of the rod. On the measured noise emanating from the test rod, spend their diagnosis to detect the emergence and development of fatigue cracks.

In addition, in some cases, the value of a constant load can be chosen equal to the weight of the column of rods and equipment for the simulated rod columns. The choice of a value for a constant load equal to the weight of the column of rods and equipment for the simulated rod column allows you to more fully simulate a constant load on the bar.

In addition, in some cases, the direction, amplitude, period, and cha is Tautou variable load can be chosen equal to a variable load, acting on the simulated rod columns. Select the direction, amplitude, period and frequency of the variable load equal to variable load acting on the simulated rod columns, allows for more comprehensive model variable load on the bar.

In addition, in some cases on the simulated rod can act constant and/or variable lateral load directed at an angle from 0° to 90° to the axis of the rod. The effect on the simulated arm is constant and/or variable lateral load directed at an angle from 0° to 90° to the axis of the rod, allows you to more fully simulate lateral forces (for example, due to friction on the string of tubing) on the bar.

In addition, in some cases, the lateral load can be applied in the most intense place of the rod. The application of the lateral load in the most intense place rod allows you to more fully evaluate the effect of side loads.

In addition, in some cases through the docking device on the rod may be filed torque. Flow through the expansion device on the rod torque allows to take into account the torque acting on the rod, and to apply the results obtained to drive the screw pumps.

In addition, in some cases, the load on the test rod can be selected is equal to the load on the upper arm. The choice of loads on the test rod is equal to the load on the top bar allows you to simulate the most hard rod columns.

In addition, in some cases, a constant load on the rod can be selected in the range from zero to load the gap. The choice of the constant load on the rod in the range from zero to load the gap allows you to conduct tests at constant load throughout the possible range.

In addition, in some cases, the load on the rod can be selected from conditions provide the accelerated equivalent tests. The choice of loads on the rod of the conditions for accelerated equivalent test allows to reduce the test time.

In addition, in some cases, the test rod can be placed, for example on the coupling portion of the tubing, with the axis of the rod and tubing are not necessarily the same. Putting on the test rod, for example on the clutch side of the tubing, with the axis of the rod and tubing are not necessarily the same, allows to simulate the friction rod on tubing - load 8T rod is extended by 4 mm or more (depending on the material, diameter, coating and so on).

In addition, in some cases, part worn tubing can the t to make a reciprocating motion. Committing part worn tubing reciprocating motion allows you to more fully simulate the work of a rod.

In addition, in some cases, wearing part of the tubing can be bent. Execution curved worn part of the tubing allows you to more fully simulate the friction rod on tubing.

In addition, in some cases, the amplitude and/or frequency of movement of the part of the tubing into which is inserted the rod, can be equal to the amplitude and/or frequency of the actual movement of the rod string. Equality of amplitude and/or frequency of movement of the part of the tubing into which is inserted the rod, and the amplitude and/or frequency of motion of a real rod column allows you to more fully simulate the work of a rod.

In addition, in some cases, the amplitude and/or frequency of movement of the part of the tubing can be selected according to the equivalent accelerated tests. The choice of amplitude and/or frequency of movement of the part of the tubing according to the equivalent accelerated testing can reduce the test time.

In addition, in some cases, the stand may be a part of the rod. Installing the stand part of the rod reduces the size of the stand.

In addition to the, in some cases, the stand can be installed multiple series-connected rods. Installing the stand multiple series-connected rods allows you to more fully simulate the operation of the column bars

In addition, in some cases, the test rod can perform a reciprocating movement. Performing the test rod reciprocating motion allows you to more fully simulate the operation of the rods.

One possible implementation of the method of bench tests of natural samples rods or models of rods on fatigue strength is shown in figure 1.

Rod 1 via the connecting device 2 mounted on the frame 3 at one end. The other end of the rod 2 through the connecting device 4 is connected with the load device 5. The rod 1 is in contact with the load machine 6 by means of the coupling device 7. On the rod 1 is installed sensors noise 8.

The operation of this variant is as follows. On the rod 1 through the connecting device 4 from the load device 5 serves constant and variable load. Since the other end of the rod 1 via the connecting device 2 mounted on the frame 3, the rod 1 is stretched, and the amount of stretch may vary due to variable load. Complement is Ino Sha rod 1 acts lateral load, transmitted from the load machine 6 through the connecting device 7. With all the stress in the rod arise noises that are registered by the sensors 8. Then the noises are stored and processed. From their analysis determine the moments of the formation and growth of fatigue cracks.

Thus, the claimed invention allows for bench-top testing of rods in conditions that are closest to those that arise when the rods with the composition of sucker rod pumps.

1. The way of bench testing of natural samples rods or models of rods on fatigue strength, allowing you to experience the bar, which has one end fixed to the stand, and the other through the connecting unit is the load, characterized in that the rod establish one or more sensors of the reception spectrum of the noise, through the connecting device at the end of the rod serves at the same time constant and/or variable load, the direction of which coincides with the axis of the rod, measured noise emanating from the tested rod, spend their diagnosis to detect the emergence and development of fatigue cracks, and the test rod can be connected to one or two couplings, on the simulated rod can act constant and/or variable lateral load directed at an angle from 0 to 90° about who and rod, on the test rod can be worn, for example, the coupling portion of the tubing, with the axis of the rod and tubing are not necessarily the same.

2. The way of bench testing of natural samples rods or models of rods on the fatigue strength according to claim 1, characterized in that a constant load is chosen equal to the weight of the column of rods and equipment for the simulated rod.

3. The way of bench testing of natural samples rods or models of rods on the fatigue strength according to claim 1 or 2, characterized in that direction, amplitude, period and frequency of the variable load is chosen equal to a variable load acting on the simulated arm.

4. The way of bench testing of natural samples rods or models of rods on the fatigue strength according to claim 1 or 2, characterized in that the lateral load is applied in the most intense place of the rod.

5. The way of bench testing of natural samples rods or models of rods on the fatigue strength according to claim 1 or 2, characterized in that via a docking device on the rod serves torque.

6. The way of bench testing of natural samples rods or models of rods on the fatigue strength according to claim 1 or 2, characterized in that the load on the test rod is chosen equal loads on the upper rod colon is s rods.

7. The way of bench testing of natural samples rods or models of rods on the fatigue strength according to claim 1 or 2, characterized in that a constant load on the rod is chosen in the range from zero to load the gap.

8. The way of bench testing of natural samples rods or models of rods on the fatigue strength according to claim 1 or 2, characterized in that the load on the barbell choose from a condition of providing accelerated equivalent tests.

9. The way of bench testing of natural samples rods or models of rods on the fatigue strength according to claim 1 or 2, characterized in that the part worn tubing makes a reciprocating motion.

10. The way of bench testing of natural samples rods or models of rods on the fatigue strength according to claim 1 or 2, characterized in that the wearing portion of the tubing is bent.

11. The way of bench testing of natural samples rods or models of rods on the fatigue strength according to claim 1 or 2, characterized in that the amplitude and/or frequency of movement of the part of the tubing into which is inserted the rod, equal to the amplitude and/or frequency of the actual movement of the rod string.

12. The way of bench testing of natural samples rods or models of rods on the fatigue strength according to claim 1 or 2, characterized in that the amplitude and/or frequency of movement of the portion of the tubing is selected according to the equivalent accelerated tests.

13. The way of bench testing of natural samples rods or models of rods on the fatigue strength according to claim 1 or 2, characterized in that the stand set part of the rod.

14. The way of bench testing of natural samples rods or models of rods on the fatigue strength according to claim 1 or 2, characterized in that the stand set multiple series-connected rods.

15. The way of bench testing of natural samples rods or models of rods on the fatigue strength according to claim 1 or 2, characterized in that the test rod performs reciprocating motion.



 

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