Anti-corrosion wear-resistant anti-drag oil casing

Abstract

The invention discloses an anti-corrosion, wear-resistant and resistance-reducing oil casing which is used for solving the problems of corrosion prevention, scale prevention, paraffin prevention, wear resistance, friction resistance reduction and the like of the oil casing in an oil and gas well. According to the technical scheme, different ions are electrically deposited on the inner surface and the outer surface of the oil casing to form an alloy layer according to the service environment of the oil casing, and then the oil casing with corrosion resistance, scale resistance, wax resistance, wear resistance and friction resistance reduction performance is manufactured through the measures of dehydrogenation, polishing, hole sealing with a plugging agent and the like. According to the oil casing, the friction coefficients between oil casings, between a sucker rod and an oil pipe and between the casing and a borehole can be obviously reduced, the flow resistance of fluid in the oil casing is reduced, the service life of the oil casing is prolonged, and the oil and gas exploitation efficiency is improved. The anti-corrosion wear-resistant anti-drag oil casing is low in machining difficulty, controllable in cost, wide in application range and convenient to popularize and apply.

Description

technical field [0001] The invention relates to an anti-corrosion, anti-scaling, anti-wax, wear-resistant and friction-reducing oil casing for exploitation of geological resources (petroleum, natural gas, geothermal water and underground minerals), and belongs to the field of mechanical processing. Background technique [0002] Corrosion and wear of mining equipment for geological resources (oil, natural gas, geothermal water and underground minerals) are known as two world-class problems. In the domestic oil and gas exploration and development industry alone, there are about 29,200 oil wells with varying degrees of damage. corrosion and wear. With the increase in the development life of domestic oil and gas fields and the service life of equipment, especially the development of high-sulfur oil and gas reservoirs and other oil and gas reservoirs containing acid corrosive media, corrosion and wear have brought increasingly prominent disadvantages to the safe and stable operat...

AI Technical Summary

Problems solved by technology

Although part of the oil casing is lined with a protective layer in its inner hole (such as lining high-density polyethylene, lining ceramics, etc.), or adding a coating or plating layer (such as coating epoxy resin) inside and outside the oil casing powder, nickel-phosphorus plating, nickel-tungsten plating, etc.) nickel-tungsten alloy, etc.), but because: 1. The coating layer or plating layer cannot effectively cover all surfaces (inner and outer surfaces) of the oil casing, and there are many cracks, pinholes and leaks; 2. The mechanical properties of the coating layer or plating layer are quite different from those of the oil casing, and cracks form visible cracks; 3. The bonding force between the coating layer or plating layer and the oil casing pipe is weak, and the peeling off of the coating layer or plating layer will accelerate the concentration of the oil casing pipe Corrosion; 4. The lining protection layer reduces the inner diameter of the oil casing and reduces the oil casing transmission capacity; 5. The lining protection layer increases the operation difficulty of the oil casing; 6. The lining protection layer increases the oil casing In addition to anti-corrosion and wear resistance, it also increases the wear of tools used in conjunction with oil casings (such as sucker rods and sucker rod centralizers, etc.); Oil and casing anti-scale and wax have little effect, etc.

At present, there is no method that can solve the above problems

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