Injection agent for water injection well and preparation method and application of injection agent

Abstract

The invention provides an injection agent for a water injection well and a preparation method and application of the injection agent. The injection agent for the water injection well comprises the following raw material components: 5.0%-10.0% of sulfamic acid, 10.0%-20.0% of methanol, 10.0%-20.0% of tartaric acid, 10.0%-20.0% of ethylenediamine theramethylenephosphonic acid, 5.0%-10.0% of sodium polyacrylate, 5.0%-8.0% of coco-isethionic acid and the balance of water. The invention further provides a preparation method of the injection agent. The injection agent for the water injection well can be used in a construction technology for acidizing of a reservoir, and can be directly used. While dissolving scale, the injection agent further can achieve dilation effect, and the purposes of reducing pressure and increasing yield are achieved finally.

Description

technical field [0001] The invention relates to an injection booster for water injection wells, in particular to an injection booster capable of dissolving scale, shrinking expansion and reducing pressure, and belongs to the technical field of petroleum exploitation. Background technique [0002] After the oilfield enters the middle and late stage of water injection development, due to the change of pressure, temperature and other conditions, as well as the thermodynamic instability and chemical incompatibility of water, knots often occur in water injection formations, oil casings, downhole, surface equipment and gathering and transportation pipelines. scale; and the clay minerals in the reservoir absorb and inject water and expand, thereby reducing the porosity and permeability of the reservoir and causing damage to the reservoir, which may cause great damage to the low-permeability layer, reducing the permeability of the reservoir and increasing the Large interlayer permea...

AI Technical Summary

Problems solved by technology

[0002] After the oilfield enters the middle and late stage of water injection development, due to the change of pressure, temperature and other conditions, as well as the thermodynamic instability and chemical incompatibility of water, knots often occur in water injection formations, oil casings, downhole, surface equipment and gathering and transportation pipelines. scale; and the clay minerals in the reservoir absorb and inject water and expand, thereby reducing the porosity and permeability of the reservoir and causing damage to the reservoir, which may cause great damage to the low-permeability layer, reducing the permeability of the reservoir and increasing the The large difference in permeability between layers increases the conflict between layers, resulting in high water injection pressure and difficult injection of water injection wells, resulting in a decrease in oil and gas field production, an increase in water injection pressure, downhole and surface equipment, and even oil and gas wells shut down

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