Oil-sucking rod repaired from semi-coated to fully-coated

Abstract

The invention provides an oil-sucking rod repaired from semi-coated to fully-coated. According to the oil-sucking rod repaired from semi-coated to fully-coated, a wrench installation portion is machined into a cylindrical segment, oil-sucking rod screw threads are machined on the cylindrical segment, an uncoated segment is coated with a coating layer, the upper portion of a semi-coated layer and the lower portion of an upper coated layer are provided with a lower compressing sleeve in a sleeved manner, the lower compressing sleeve is squeezed to make the lower compressing sleeve wrap the upperportion of the semi-coated layer and the lower portion of the upper coated layer after hole shrinkage, the upper portion of the semi-coated layer and the lower portion of the upper coated layer are made to be in close fit with an oil-sucking rod body, the diameter of a lower portion inner hole of a thrust connector is equal to that of the part, machined into the cylindrical segment, of the wrenchinstallation portion, the upper portion of the thrust connector is provided with inner screw threads, the inner screw threads of the upper portion of the thrust connector are matched with the oil-sucking rod screw threads, the lower portion of the thrust connector sleeves the upper portion of the upper coated layer, the inner screw threads of the upper portion of the thrust connector are connected with the oil-sucking rod screw threads to make the thrust connector form a thrust surface at the head portion of the oil-sucking rod body, and the lower portion of the thrust connector is squeezed to make the lower portion of the thrust connector compress the upper portion of the upper coated layer after deformation and the hole shrinkage.

Description

technical field [0001] The invention belongs to a sucker rod used for connecting an oil pump and a pumping unit in an oil pumping well of an oil field, and is a half-coated sucker rod repaired into a full-coated sucker rod. Background technique [0002] In the oil field pumping system, the sucker rod is immersed in the well fluid to work, and the well fluid contains corrosive media, which will corrode the sucker rod, resulting in a short service life of the sucker rod string, a short production cycle of the oil well, and poor economic benefits . In order to solve this problem, the oil field has used material-type anti-corrosion sucker rods, but this kind of sucker rods are made of metal materials and have limited corrosion resistance, which cannot completely solve the problem of corrosion. Chinese patent 200620086330.8 "A kind of anti-eccentric wear sucker rod". In the actual use of the technical solution involved in this patent, it is found that the well fluid will enter t...

AI Technical Summary

Problems solved by technology

[0002] In the oil field pumping system, the sucker rod is immersed in the well fluid to work, and the well fluid contains corrosive media, which will corrode the sucker rod, resulting in a short service life of the sucker rod string, a short production cycle of the oil well, and poor economic benefits

In order to solve this problem, oil fields have used material-type anti-corrosion sucker rods, but this kind of sucker rods are made of metal materials and have limited corrosion resistance, which cannot completely solve the problem of corrosion

Chinese patent 200620086330.8 "A kind of anti-eccentric wear sucker rod". In the actual use of the technical solution involved in this patent, it is found that the well fluid will enter the anti-wear pipe, so that the sucker rod will be corroded by the well fluid and prone to oil pumping rod breakage accident

For this reason, the technicians designed the Chinese patent 2012203275962 "A New Type of Anti-eccentric Wear Sucker Rod". This kind of sucker rod should be treated with QPQ salt bath on the surface of the sucker rod (1) to form a QPQ salt bath layer ( 4), the well fluid will enter the anti-wear tube and the sucker rod will not be corroded, but the processing is complicated, which will greatly increase the production cost of the sucker rod

Therefore, the technicians designed the Chinese patent 201520959166.6 "New Polyethylene Semi-coated Sucker Rod". The well fluid will not enter the gap between the sucker rod and the coating, and the sucker rod will not corrode, but it will There is a section at one end of the wrench mounting part that is not coated with an anti-corrosion and anti-wear layer, so it is called half-coated. Although other anti-corrosion measures have been taken for the uncoated section, in actual use, the uncoated section corrodes very seriously. Therefore, the Chinese patent 201520959166.6 "New Polyethylene Semi-coated Sucker Rod" cannot achieve the desired effect

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