Multifunctional pipe rod protection device and manufacturing method thereof

Abstract

A multifunctional pipe and rod protection device comprises an upper centralizer, a lower centralizer, a sacrificial anode and a slow-release shell. Two anode assemblies of the sacrificial anode are oppositely buckled, wrapped with the slow-release shell and fixed to the outer wall of an oil suction rod, and the upper centralizer and the lower centralizer are fixed to the two ends of the sacrificial anode in an injection molding mode. The multifunctional pipe and rod protection device can prevent corrosion and eccentric wear of the oil suction rod and an oil pipe. The manufacturing method of the multifunctional pipe and rod protection device comprises the following steps that the anode assemblies are cast; the slow-release shell is machined and prepared; the oil suction rod is prepared; the anode assemblies and the slow-release shell are assembled to the oil suction rod and a seam of the slow-release shell is welded; nylon powder used for manufacturing the upper centralizer and the lower centralizer is dried; and the nylon powder is put into an injection molding machine hopper, the anode assemblies, the slow-release shell and the oil suction rod which are assembled and welded are put into an injection molding machine mold, the upper centralizer and the lower centralizer are made from the nylon powder in the injection molding mode and fix the anode assemblies and the slow-release shell to the oil suction rod, and manufacturing of the multifunctional pipe and rod protection device is completed.

Description

technical field [0001] The invention relates to a downhole system protection device of a pumping unit, in particular to a protection device for a sucker rod and an oil pipe; the invention also relates to a manufacturing method of the protection device for a sucker rod and an oil pipe. Background technique [0002] With the gradual development of oil fields, oil wells have the characteristics of high proportion of deviated wells, high water cut and high corrosion rate. The water content and salinity of inclined wells increase, the eccentric wear and corrosion of sucker rods intensify, and it is more difficult to control water, stabilize oil and effectively extract liquid. The comprehensive water content of oil wells is 90.6%, and the average water content of pumping wells is 79.8%. The lubrication between rods and pipes is poor, and the friction and wear are serious. [0003] In some oil areas, the geological structure is complex, the properties of liquid production are dive...

AI Technical Summary

Problems solved by technology

[0004] When performing oil pumping work, the sucker rod reciprocates up and down in the oil pipe, the outer wall of the sucker rod is easy to contact with the inside of the oil pipe and produces eccentric wear, which is easy to damage the oil pipe and the sucker rod

If the oil pipe is damaged, the oil pipe will be lost, and the oil pipe needs to be replaced, which will increase the capital investment of the oil well; after the sucker rod is eccentrically worn, it is easy to break off and fall into the well, resulting in a production accident, which will cause a large loss to the oilfield economy. Therefore, it is necessary to Protection devices for sucker rods and oil pipes to prevent corrosion and partial wear of sucker rods and oil pipes

[0005] The anti-corrosion and partial wear products in the prior art include: setting the inner liner, the inner liner can prevent partial wear and prevent the corrosion and wax deposition of the oil pipe, but the corrosion of the sucker rod cannot be avoided, and the cost of setting the inner liner is Higher; installing sucker rod centralizers can prevent eccentric wear, but it cannot solve the corrosion problem; adding anti-corrosion chemicals to the well will easily pollute the environment, and different wells need to be equipped with different chemicals due to different conditions in the well; anti-corrosion pumping Rods can prevent corrosion but not partial wear; anodes can protect sucker rods from corrosion, but they cannot be used in wells with partial wear

The above products generally have the following problems: short service life, weak anode connection and easy to fall off; or the problem that the connection method of the centralizer, anode and sucker rod will damage the strength of the sucker rod; the product structure is complicated, the cost is high, and the manufacturing cost is increased. and installation time

Images