Solid corrosion and scale inhibitor for oil field

Abstract

The invention discloses a solid corrosion and scale inhibitor for an oil field, which relates to the technical field of chemical medicine reagents used for the oil field. The solid corrosion and scale inhibitor comprises the following ingredients: 2-phosphonic acid butane 1, 2, 4-tricarboxylic acid PBTCA, polyethyleneglycol, sodium hexametahposphate, span-60 and stearic acid, wherein each ingredient accounts for the mass percent of the sum of all the ingredients as follow: 30 percent to 40 percent of 2-phosphonic acid butane 1, 2, 4-tricarboxylic acid PBTCA, 10 percent to 15 percent of polyethyleneglycol, 10 percent to 15 percent of sodium hexametahposphate, 15 to 25 percent of span-60 and 20 percent to 30 percent of stearic acid. The invention is particularly suitable for well tubes of oil-gas wells with server corrosion and scale conditions, and has good corrosion and scale inhibition effects on underground pipe posts and equipment.

Description

technical field [0001] The invention relates to a chemical agent for oil fields, which is mainly a solid corrosion and scale inhibitor used for oil and gas well shafts and gathering pipelines for anticorrosion and scale inhibition, and is especially suitable for oil and gas well shafts with severe corrosion and scaling. Background technique [0002] In the process of oil and gas field development, the problem of corrosion and scaling of downhole pipe strings and equipment is often encountered. Among them, adding liquid corrosion and scale inhibitors to oil and gas wells is a common anti-corrosion and scale prevention measure, but there are the following problems: [0003] ① For wells with large gas production and liquid production, the liquid agent added is easy to be taken out quickly, and the effective protection period of the agent is short, which increases the cost of anti-corrosion and scale inhibition; [0004] ②Because the oil and gas field has entered the late stage ...

AI Technical Summary

Problems solved by technology

[0003] ① For wells with large gas production and liquid production, the liquid agent added is easy to be taken out quickly, and the effective protection period of the agent is short, which increases the cost of anti-corrosion and scale inhibition;

[0004] ②Because the oil and gas field has entered the late stage of production, water is generally produced in the well, and for high water level wells, the corrosion and scale inhibitor injected from the casing is difficult to reach the inlet of the pump, so the protection effect on the pump, sucker rod and tubing is not enough ideal;

[0005] ③The filling operation of liquid medicine requires injection pumps, balance tanks, pump injection trucks and other filling devices, and the well needs to be shut down, which increases the cost and affects the output;

[0006] ④The liquid agent is easy to adhere to the oil pipe wall, causing unnecessary loss

[0013] However, the above-mentioned solid wax and scale inhibitors only solve the technical problem of poor wax removal and scale removal in oil wells, but do not solve the technical problem of easy corrosion and scaling of downhole pipe strings and equipment