Production method of ultra-high molecular weight polyethylene composite oil pipe

Abstract

The invention discloses a production method and a production system of an ultrahigh molecular weight polyethylene compound oil pipe. The method utilizes the memory property of the ultrahigh molecular weight polyethylene material and a special composite technology: conducting hole shrinkage treatment on an ultrahigh molecular weight polyethylene lining pipe with outer diameter larger than the inner diameter of a steel pipe, sheathing in the steel pipe, heating to restore inner diameter of the ultrahigh molecular weight polyethylene lining pipe, and forming the lining pipe with the steel pipe into an integral structure to reach a compactness and firmness without layering and stripping. By introducing additives, the invention greatly improves liquidity of the ultrahigh molecular weight polyethylene in order to produce the inner lining pipe with small wall thickness and reduce cost. The ultrahigh molecular weight polyethylene compound oil pipe provided by the invention comprehensively reserves specific superior performances of good memory property, high impact resistance, good temperature resistance, wear resistance, corrosion resistance, wax precipitation and fouling resistance of ultrahigh molecular weight polyethylene pipe. The invention also discloses a production system supporting the production method.

Description

technical field [0001] The invention relates to a production method and a production system of a composite oil pipe, in particular to a production process and a production system of an ultra-high molecular weight polyethylene composite oil pipe. Background technique [0002] As an important consumable in the field of petroleum and natural gas exploration and development, oil well pipe occupies an important position in the petroleum industry. It mainly includes drill string components, such as drill pipe, kelly, drill collar, casing and oil pipe, etc. At present, my country consumes more than 2 million tons of oil well pipes every year, of which the consumption of oil pipes is about 500,000 tons. [0003] In the prior art, steel oil pipes are generally used, and their service life and replacement cycle are short, mainly due to wear and corrosion during use. Among them, the wear is mainly manifested as eccentric wear, which is easy to aggravate the electrochemical corrosion o...

AI Technical Summary

Problems solved by technology

The processing technology adopted has always been the traditional process of heating and melting the plastic to be lined to a fluid state before injection molding. However, the traditional injection molding method is used for steel lining molding. Among them, the steel surface treatment process is complicated and the processing requirements are high, and the injection molding process needs to be prepared in advance. Making molds requires cumbersome process steps such as demoulding after molding, which to a certain extent results in poor product quality and quality stability and consistency, and even poor adhesion between ultra-high molecular weight polyethylene materials and steel pipes, peeling of the inner lining, Phenomena such as looseness, and the manufacturing cost of the product is high and many other deficiencies

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