Curved limited movement type anti-wear sucker rod and manufacturing method thereof

Abstract

The invention discloses an arc-shaped surface limited movement type anti-wear sucker rod and a manufacturing method thereof. The limited movement type anti-wear sucker rod is formed by additionally arranging a plurality of limiters and strengthening bodies on a sucker rod body. The limiters are firmly connected onto the sucker rod body through casting and a strengthening body is arranged between every two adjacent limiters; a plurality of spiral lug bosses and spiral grooves are arranged on the circumferential side of each strengthening body; the spiral groove between every two spiral lug bosses is used as an oil flowing channel; and the outer circle of the strengthening body is of an arc-shaped surface shape. Compared with the prior art, the arc-shaped surface limited movement type anti-wear sucker rod can prevent a connecting hoop of the sucker rod from eccentric wear and a rod body of the sucker rod from the eccentric wear, and can also prevent the sucker rod from being broken and falling off, so that the strengthening bodies can move when necessary; and meanwhile, the served limited movement type anti-wear sucker rod can also be used for scraping wax and the sucker rod can be prevented from releasing.

Description

technical field [0001] The invention belongs to the technical field of rod pump pumping in an oil field and the anti-eccentric wear technology, and relates to an arc-shaped limit-moving anti-wear sucker rod and a manufacturing method thereof. Background technique [0002] In the existing rod pump pumping oil recovery technology in the oil field, there are many tools for preventing partial wear, and only a few of them are better. Such as clamp type sucker rod centralizer, columnar type sucker rod centralizer and screw fixed type sucker rod anti-eccentric wear device. They play the role of righting the sucker rod and preventing the eccentric wear of the sucker rod. At the same time, there are some prominent problems; 1) Clamp-type sucker rod centralizer: it can straighten the sucker rod and slow down the wear of the sucker rod and the sucker pipe. Its own R = 0.5 mm tension rod is fitted with the sucker rod, and then manually fitted on the sucker rod when in use. There are ...

AI Technical Summary

Problems solved by technology

During use, due to friction and temperature changes in the pumping well, it is easy to cause the centralizer to loosen and move in series on the sucker rod, and the anti-eccentric wear function becomes invalid.

The third is difficult to install; the hoop-type sucker rod centralizer is installed on the sucker rod after the worker heats the centralizer with boiling water on site, and the inner diameter of the centralizer is difficult to match the outer diameter of the sucker rod, so the installation is difficult

2) Columnar sucker rod centralizer: there are the following defects, because the centralizer can only be installed on the threads of the couplings at both ends of the sucker rod

One is that it can only slow down the wear of the sucker rod coupling. For the middle part of the sucker rod body with a length of 9 meters, it cannot be straightened and anti-wear, and it cannot prevent partial wear.

Second, the guide teeth of the columnar centralizer are easy to be damaged and fall off, resulting in well jamming accidents

The third is that the stress of the steel joint and the sucker rod is inconsistent, and it is easy to break and cause a well lying accident

Fourth, the diameter of the steel joint is large, which limits the size of the centralizer, the cross-sectional area of ​​the oil flow channel is limited, and the resistance is large, which increases the load of the pumping unit and affects the fluid production of the oil well. Moreover, the above products have no wax scraping function

3) The inventor of this case previously owned a patent for a spiral fixed sucker rod anti-eccentric wear device. After years of use in the oil field, it has been proved that it can straighten the sucker rod and prevent the partial wear between the sucker rod coupling and the sucker rod body. , but its existing problem is: the design of the outer circle of the anti-eccentric wear device is columnar. When the bending angle of the oil well is too large and the sucker rod is forced to bend, due to the obstruction at both ends of the product of the cylindrical anti-eccentric wear device, the sucker rod itself The bending strength is limited, local stress is generated, and it is easy to cause the sucker rod to break

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