Oil and gas well low-temperature blocking remover, and preparation method and application thereof

Abstract

The invention belongs to the technical field of oil-gas well blocking removal, and particularly relates to an oil and gas well low-temperature blocking remover, and a preparation method and application thereof. The blocking remover is prepared from, by mass, 5-20% of a main agent DTPA, 1-3% of an auxiliary agent EDTA, 1-2% of a suspending agent, 1-3% of an anionic emulsifier, 0.5-1% of a lubricant, and the balance of water, The suspending agent is bentonite or diatomite; and the lubricant is a liquid oily substance. The blocking remover provided by the invention has relatively high descaling efficiency, can also have a relatively high corrosion rate on barium sulfate at a low temperature of 45 DEG C, and has a good application prospect.

Description

technical field [0001] The invention belongs to the technical field of plugging removal for oil and gas wells, and in particular relates to a low-temperature plugging removal agent for oil and gas wells, a preparation method and application. Background technique [0002] During the oil and gas production process, many kinds of blockages will be formed in the wellbore and surface pipelines. These blockages will not only affect the production of oil and gas, but also change the pipeline pressure, affect the life of the pipeline, and cause safety hazards. The most common blockage in oil and gas production contains divalent barium ions, and the most common type of blockage is barium strontium scale, which is a very stable blockage that is difficult to dissolve in acidic or alkaline conditions, so the barium Strontium scale is a major problem leading to plugging of oil and gas wells. [0003] Because the barium strontium scale is hard and dense, physical methods have poor descal...

AI Technical Summary

Problems solved by technology

The specification of this patent records the scale dissolution effect of calcium carbonate, magnesium carbonate, and marble under the reaction condition of 60°C, and the dissolution rate is between 22.10-60.35%. However, the reaction temperature of this patent still needs to be above 60°C, which cannot Effective descaling for clogged sections with temperatures below 60°C

[0005] In summary, the problem existing in the prior art is that there is a lack of a plugging agent suitable for low temperature environments below 60°C

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