Biodegradable copolyester nanometer composite material and temporary plugging agent prepared from biodegradable copolyester nanometer composite material

Abstract

The present invention discloses a biodegradable copolyester nanometer composite material and a temporary plugging agent prepared from the biodegradable copolyester nanometer composite material. The biodegradable copolyester nanometer composite material is characterized in that a poly ethylene terephthalate esterification intermediate or ethylene terephthalate, a carboxyl-terminated lactic acid prepolymer and an inorganic nanometer material are subjected to in situ copolymerization to obtain the biodegradable copolyester nanometer composite material, wherein the intrinsic viscosity of the biodegradable copolyester nanometer composite material is 0.3-2.0 dl / g, the viscosity-average molecular weight is 10000-60000, the glass transition temperature is 60-90 DEG C, the melting point is 130-270 DEG C, and the 80 DEG C hydrothermal degradation rate is greater than 90%; and the biodegradable copolyester nanometer composite material is prepared into the powder or short fibers adopted as the temporary plugging agent for the oil and gas exploration project, wherein the temporary plugging agent produces effects of automatic plugging relieving, oil-gas reservoir protecting, oil-gas production efficiency increasing and yield increasing after the temporary plugging agent forms the temporary plugging layer in the oil-gas layer pore channel; and the biodegradable copolyester nanometer composite material has characteristics of high intrinsic viscosity, excellent original mechanical property, controllable degradation process, and wide and efficient application.

Description

technical field [0001] The invention belongs to the technical field of polymer materials and polymer composite materials, and in particular relates to a preparation method of a degradable copolyester nanocomposite material and the application of a temporary plugging agent prepared therefrom in the exploitation of oil and gas reservoirs. Background technique [0002] Polyethylene terephthalate (PET) has become one of the world's largest polymers due to its excellent mechanical properties and cost advantages. In the classification of polymer plastics, the code name of PET is No. 1. Extremely wide, it can be spun into polyester fiber for textile field, and can also be made into film for recording, video, movie film, etc., and can also be blown into various beverage bottles, etc. Mechanical parts, illuminator housings and other electrical fields. Such a large amount of polyester molecular chain materials with a wide range of polymer chains has a benzene ring structure that is d...

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Problems solved by technology

[0013] The invention provides a degradable copolyester nanocomposite material, which adopts nano inorganic phase as a dispersed phase and a catalyst component in the copolymerization of polyester and polylactic acid to form a degradable copolyester nanocomposite material and prepare a temporary plugging agent thereby; The temporary blocking agent is a 30-75 μm powder made of degradable copolyester nanocomposite material or a short fiber product formed by spinning and cutting; the degradable copolyester nanocomposite temporary blocking agent is , forming a temporary plugging layer in the oil and gas layer and producing spontaneous and controllable degradation under the conditions of water, high temperature, high pressure and biological environment in the oil and gas layer, without the need to use the plugging removal process after the temporary plugging, which will not cause environmental pollution and reduce engineering Cost, improve oil and gas recovery efficiency and oil and gas production, this kind of temporary plugging agent has not been reported at home and abroad

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