A coilable glass fiber reinforced plastic composite pipe and its preparation method

Abstract

The invention belongs to the technical field of plastic composite pipe material and discloses a coilable type glass fiber reinforced plastic composite pipe. The technical scheme of the coilable type glass fiber reinforced plastic composite pipe is that the composite pipe comprises an inner pipe layer, a reinforced layer and an outer pipe layer, wherein the reinforced layer consists of a coiled layer or a woven layer which is formed of resin-impregnated glass fiber. According to the coilable type glass fiber reinforced plastic composite pipe, the reinforced layer utilizes the resin which is mainly composed of polyether polyol mixture, dibutyl phthalate, polyurethane resin or bisphenol-A epoxy resin, K54 tertiary amine and HG-66 active silicon micro powder, so that the reinforced layer is solidified with the glass fiber to form an integral fiberglass-reinforced structure with bending property. The coilable type glass fiber reinforced plastic composite pipe has the bending property and enough anti-external-pressure property.

Description

technical field [0001] The invention belongs to the technical field of composite pipes, and in particular relates to a coilable glass fiber reinforced plastic composite pipe used in the fields of petroleum, chemical industry, ocean and the like, especially for downhole water injection and a preparation method thereof. Background technique [0002] Downhole water injection in oil wells is used to increase the pressure of oil reservoirs. The pipelines used for downhole water injection are steel pipes; since the oil wells are mostly hundreds of meters to thousands of meters, the steel pipe fibers used are only welded with steel pipes with a single length of about ten meters. The downhole water injection pipeline welded by this kind of steel pipe is not only difficult to install and maintain due to its heavy weight and inability to bend when going downhole, but also has a short service life of the steel pipe due to its corrosiveness downhole. kind of waste. [0003] The compos...

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Problems solved by technology

The downhole water injection pipeline welded by this kind of steel pipe is not only difficult to install and maintain due to its heavy weight and inability to bend when going downhole, but also has a short service life of the steel pipe due to its corrosiveness downhole. kind of waste

[0003] The composite high-pressure delivery pipe commonly used in petroleum transportation, such as a new type of reinforced winding pipe disclosed in the invention patent application with the Chinese patent application number 201310530359.5, the winding pipe is a straight pipe structure composed of polyethylene or polypropylene resin as the main raw material. , this kind of winding pipe composed of directly winding the reinforcing layer on the plastic inner pipe layer, although it can withstand internal pressure better, its resistance to external pressure is difficult to meet the requirements; Chinese patent application number is 201210473730.4 invention patent application publication An epoxy resin impregnated glass fiber tape continuous reinforced composite pipe is disclosed, its structure includes an inner pipe, an epoxy resin impregnated glass fiber tape reinforcement layer wound on the outer layer of the inner pipe, a modified closed-cell foam insulation layer and an outsourcing Covered with a polyethylene outer protective layer, the composite pipe of this structure is not only difficult to meet the needs of internal and external pressure performance, but also difficult to bend because the reinforced layer is composed of epoxy resin impregnated glass fiber tape, so it cannot meet the needs of downhole pipes

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