Solid inhibitor and preparation method thereof

Abstract

The invention discloses a solid rust inhibitor for oil well down-hole facilities and collector pipeline, which is prepared by the following material of weight ratio: high-carbon-alkylamine surfactant 5-15%, triethylene tetraamine 2-10%, triethanolamine 2-10%, sodium hexametaphosphate 20-40%,polyethylene 20-50%. The preparation method is as follows: first synthesizing intermediate M1, placing triethylene tetraamine in agitator tank, adding triethylene tetraamine and obtaining intermediate M#-[1], intermediate M#-[2] synthesis: placing high-carbon-alkylamine surfactant in agitator tank, adding intermediate M#-[1],sodium hexametaphosphate, obtaining intermediate M#-[2], adding intermediate M#-[2] in polyethene. At last, the polygonal hollow column product is obtained by injection machine The invention operates easily, rust prevention property is consistent, and integrated rust prevention ratio is high, which prolongs the life time of apparatus.

Description

Technical field: [0001] The invention relates to a corrosion inhibitor for oil field anticorrosion and a preparation method thereof, in particular to a solid corrosion inhibitor for oil well downhole facilities and gathering pipeline anticorrosion and a preparation method thereof. Background technique: [0002] During the extraction of crude oil, formation water, sulfur-containing substances, and some acidic gases are also produced along with the extraction of crude oil, and the CO in the water 3 2- 、HCO 3 - , Cl - Under the combined effect of these factors, the underground facilities and surface pipelines are severely corroded, and the corrosion rate reaches 1.0-1.7mm / a, which greatly shortens the production capacity. The service life of the production equipment is shortened, the production cost is increased, and the production schedule is affected. In order to reduce corrosion, the traditional method in various oil fields is to add liquid corrosion inhibitors for anti...

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Problems solved by technology

[0002] During the extraction of crude oil, formation water, sulfur-containing substances, and some acidic gases are also produced along with the extraction of crude oil, and the CO in the water 3 2- 、HCO 3 - , Cl - Under the combined effect of these factors, the underground facilities and surface pipelines are severely corroded, and the corrosion rate reaches 1.0-1.7mm / a, which greatly shortens the production capacity. The service life of the production equipment is shortened, the production cost is increased, and the production schedule is affected

In order to reduce corrosion, the traditional method in various oil fields is to add liquid corrosion inhibitors for anticorrosion, but it is not ideal in terms of actual effect, input-output ratio and work efficiency. The main problems are as follows: 1. The injected liquid Corrosion inhibitors are quickly taken out with the oil and water mined, which reduces the effective efficiency of corrosion inhibitors, shortens the period of corrosion inhibition, increases the energy consumption of corrosion inhibitors, and increases the cost of corrosion protection.

2. Uneven corrosion inhibition and low overall corrosion inhibition rate

Since the corrosion inhibitor is added periodically (usually once every 20 to 30 days), the corrosion inhibition rate is very high at the beginning of the injection of the corrosion inhibitor. The effective concentration of the agent decays sharply, and the corrosion inhibition rate also decreases sharply. The average corrosion inhibition rate is only about 50% (the highest is more than 90%, and the lowest can reach about 20%). When the corrosion inhibition rate reaches the lowest value, the pipeline and equipment In the danger of being subjected to uncertain factors, it is possible to expose or semi-expose it to a corrosive environment for a long time, and also greatly reduce the follow-up anti-corrosion work

3. The filling process is complicated, and high-pressure injection pumps, pressure vessels or vehicle-mounted pumps and other facilities and equipment must be used to fill liquid corrosion inhibitors, which not only poses safety hazards, but also increases other production costs

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