Corrosion controller of oil well production equipment and sucker rod employing controller

Abstract

The invention belongs to the field of corrosion protection of a metal material, and relates to a corrosion controller of oil well production equipment and a sucker rod employing the controller. The corrosion controller of the oil well production equipment comprises a short section, a sacrificial anode section and a sacrificial anode protecting cover, wherein outer threads are arranged at two ends of the short section; an upsetting flange is respectively arranged at two ends of the short section; the sacrificial anode section is tightly matched with the short section; and a gap or a round hole is arranged on the sacrificial anode protecting cover. Compared with the prior art, the oil well corrosion controller is high in cost performance; the production period of the oil well is increased; the maintenance charge is reduced; the corrosion controller has good application prospect in anti-corrosive engineering of an oil well pipe, a rod, and a pump; the oil well corrosion controller is reasonable in structure design, significant in effect, simple and feasible to install, and can be designed according to the specific condition of the site; and later maintenance is not needed within a production period after being installed, and the adjacent facilities are not disturbed when working.

Description

technical field [0001] The invention belongs to the field of corrosion protection of metal materials, and in particular relates to a corrosion controller for oil production equipment in an oil field and a sucker rod using the controller. Background technique [0002] In the development and production of oil fields, the corrosion of oil wells has always been an important problem restricting the normal production of oil fields. With the deepening of oilfield water injection development, many areas have entered a high water-cut development period. Because the water contains corrosive media, corrosion of downhole tools and equipment of oil wells will occur, often causing accidents such as pump leakage, pipe leakage, rod and pipe breakage, and failure of downhole tools, which will bring great harm to production and cause huge economic losses. [0003] Existing oil well corrosion protection measures have certain limitations to varying degrees: using corrosion-resistant FRP, carbo...

AI Technical Summary

Problems solved by technology

Because the water contains corrosive media, corrosion of downhole tools and equipment of oil wells will occur, often causing accidents such as pump leakage, pipe leakage, rod and pipe breakage, and failure of downhole tools, which will bring great harm to production and cause huge economic losses.

[0003] Existing oil well corrosion protection measures have certain limitations to varying degrees: using corrosion-resistant FRP, carbon fiber and other materials to make oil production equipment such as sucker rods, although the anti-corrosion effect is good, but its cost is relatively high, so it is not suitable Large-scale promotion and use; surface treatment such as coating, chemical plating or nitriding on the surface of oil pipes or sucker rods is likely to cause localized corrosion, especially in oil wells with partial wear; use corrosion inhibitors and other chemical agents for oil wells Corrosion control must be targeted. Corrosion inhibitors need to be selected for the corrosion types and characteristics of oil wells in different blocks. Long-term injection on site is expensive and time-consuming; the name of Chengdu Shuer Machinery Manufacturing Co., Ltd. is the cathode of oil wells The utility model patent (ZL: 200820064420.6) of the protector first proposed the method of fixing the sacrificial anode on the sucker rod, but this patent did not consider the possibility that large pieces of the sacrificial anode might fall off during use; Jiyuan Petroleum Machinery Co., Ltd. The utility model patent (ZL: 201120031491.8) named Sucker Rod Cathodic Protector mentioned a better method, that is, adding a stainless steel protective cover outside the sacrificial anode, but the common problems of this patent and the previous patent are: The materials used are all single sacrificial anode materials, which have limited protective effects on sucker rods and other components; the first of the two patents generally mentions the distance between cathodic protectors, while the second does not. Therefore, the determination of the optimal installation distance in terms of economy and efficiency is relatively vague; and the sucker rod used in the two patents is not a commonly used form in the field, and there will be certain problems in the field matching use

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