Pipe material used for transmission layer of flexible oil gathering and transportation pipeline in oil field and preparation method thereof

Abstract

The invention relates to a pipe material used for oilfield flexible oil gathering and transporting pipe transport layers. The pipe material comprises, by mass, 5-15 parts of an ethylene-vinyl alcohol copolymer, 10-30 parts of nylon, 20-60 parts of polyphenyl ether, 5-15 parts of a compatilizer and 4-8 parts of a flexibilizer, wherein the nylon is one or a mixture of PA6 and PA66, the compatilizer is polystyrene / polyphenyl ether grafted maleic anhydride, and the flexibilizer is a polystyrene / hydrogenated styrene-butadiene-styrene copolymer grafted maleic anhydride. The material has the advantages of high high-temperture tensile strength, good oil resistance, good flexibility and excellent processing performances, and can meet oil well outlet use requirements.

Description

technical field [0001] The invention relates to a pipe material used for the transmission layer of an oilfield flexible oil gathering and transportation pipe and a preparation method thereof, and belongs to the technical field of polymer materials for oilfield flexible oil gathering and transportation pipes. Background technique [0002] At present, the flexible oil gathering and transportation pipes commonly used in oil fields are composed of an internal transmission layer, a middle reinforcing layer and an outer protective layer. As the transmission layer inside the flexible oil gathering and transportation pipeline, it directly contacts the crude oil, and its performance directly affects the service life of the flexible oil gathering and transportation pipeline. and usage environment. The material of the existing oilfield flexible pipe transmission layer is mainly high-density polyethylene, which is divided into PE100 and PE80 according to different pressure levels. Altho...

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Problems solved by technology

The material of the transmission layer of the existing flexible pipe used in the oil field is mainly high-density polyethylene, which is divided into PE100 and PE80 according to the pressure rating. The deformation temperature is only about 65°C, the tensile strength at room temperature is around 30MPa, and the tensile strength at 100°C is less than 10MPa. Its high temperature oil resistance is poor. As a flexible pipe transmission layer, the oil absorption rate exceeds 10% at 50°C and 24 hours. At 100°C, the transmission layer of the flexible pipe of high-density polyethylene will be swelled and dissolved, so this high-density polyethylene pipe material is mainly used as the transmission layer of flexible pipes for water and alcohol transportation in oil fields, which cannot meet the requirements Requirements for the use of the transmission layer of the gathering and transportation pipeline where the crude oil temperature at the outlet of the oil well is 80-105°C

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