Process for producing corrosion-protection, antiscaling and wax-proof sustained-release particles for oil well

Abstract

The invention discloses a preparation method of retardation grains used for corrosion resistance, scale prevention and wax resistance of an oil well. In the method, 35 to 50 percent of hydroxy ethylidene disodium diphosphate, 15 to 35 percent of BTA, 15 to 35 percent of ethylene-vinyl acetate multipolymer, 1 to 3 percent of polylactic acid-modified starch, 0.5 to 10 percent of butyl stearate, 1 to 4 percent of foaming agent, 0.5 to 4.5 percent of lubricant and 1 to 3 percent of polylactic acid- polyvinyl alcohol are added into a high mixer, stirred for 3 to 5 minutes for mixing uniformly under the room temperature; materials are added into a double screw extruder by an automatic feeding machine for mixing; the cured materials through mixing enter a single screw extruder, is extruded out and cut into grains; the cut grains are cooled by a fan and are transmitted to a first grade cyclone separating device for cooling-separating; and then the cut grains enter a shaking screen and are screened for obtaining the product. The retardation grains of scale prevention and wax resistance can effectively solve the problems of scale formation and wax deposition of the oil well during the oil filed production. The unqualified products in the production process can be reprocessed, thus having no wastes in the production process.

Description

Technical field: [0001] The invention relates to a preparation method of an oil field chemical preparation used in the field of oil field and gas field development, in particular to a preparation method of oil well anticorrosion, anti-scaling and anti-wax slow-release granules. Background technique: [0002] The extraction process of crude oil can be divided into three stages. The first stage refers to the eruption of crude oil by the pressure of the formation, and the recovery rate is about 15%; the second stage is the secondary oil recovery in which water is injected from the well to maintain the formation pressure, and the recovery rate is about 15% to 20%. ; The third stage is the tertiary oil recovery of tailings oil recovery using new technologies of physics, chemistry and biology, and the recovery rate is about 20% or more. [0003] In the production system, due to the change of thermodynamic conditions and hydrodynamic conditions of scale-forming ions or formation m...

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Problems solved by technology

[0003] In the production system, due to the change of thermodynamic conditions and hydrodynamic conditions of scale-forming ions or formation minerals in water, scale-forming ions or formation minerals are precipitated and deposited in various parts of the oil well to form scales. At the same time, the wax composition in crude oil Also due to the change of thermodynamic conditions, crystallization and precipitation will cause production problems such as oil well shutdown if no favorable measures are taken.

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