Environment-friendly slow-release polymer scale inhibitor and preparation method thereof

Abstract

The invention discloses an environment-friendly slow-release polymer scale inhibitor, which is good in scale inhibition and slow release effects. The dosage of the scale inhibitor which needs to be added within a maintenance cycle can be estimated in advance according to the actual production condition of an oil well; the scale inhibitor is put into a sieve tube at the lower end of an oil-well pump of the oil well in regular repair and maintenance processes of an oil-well pipeline and a gathering pipeline; scale inhibition components are slowly dissolved and released to achieve the long-term scale inhibition effect through one-off addition when a produced liquid flows through the sieve tube, so that the long-term effective concentration can be maintained, the scale inhibiting ratio within the effective service cycle (about 90-120d) is greater than 85%, the effective release time can reach 90d or over, the protection period on the pipeline is long, and the production and maintenance cost of an oil field can be effectively reduced. The environment-friendly slow-release polymer scale inhibitor is nontoxic, harmless and degradable, and does not harm the formation and surrounding environment, and is environmentally friendly and suitable for popularization and application.

Description

technical field [0001] The invention belongs to the field of oil field water treatment agents, and mainly relates to an environment-friendly slow-release polymer scale inhibitor and a preparation method thereof. Background technique [0002] With the development of the petroleum industry, most of my country's oil fields have entered the middle and late stages of oil exploitation, and the water content of oil well production fluid is high (above 85%, even 90%), and the concentration of calcium and magnesium plasma in formation water is high, which is easy to leak in oil well pipelines. Scaling is formed in the gas and gathering pipelines, causing problems such as stuck oil pumps, reduced inner diameters of gathering and transportation pipelines, and reduced flow rates, which seriously affect the production efficiency of oil wells. The increasingly serious fouling problem has brought huge economic losses to oil production, and frequent maintenance has greatly affected the produ...

AI Technical Summary

Problems solved by technology

[0002] With the development of the petroleum industry, most of my country's oil fields have entered the middle and late stages of oil exploitation, and the water content of the oil well production fluid is high (over 85%, even 90%), and the concentration of calcium and magnesium in the formation water is high, which is easy to leak in the oil well pipeline. Scale formed in the pipeline and gathering pipeline, causing problems such as stuck oil well pump, reduced inner diameter of gathering pipeline, reduced flow rate, etc., seriously affecting the production efficiency of oil wells

The increasingly serious fouling problem has brought huge economic losses to oil extraction, and frequent maintenance has greatly affected the production of oil fields, and the cost of maintenance is high

In order to solve the scaling problem of oil wells and gathering and transportation pipelines, the method of adding scale inhibitors is usually used, but the traditional method of adding liquid scale inhibitors has problems such as the difficulty of dosing due to the high pressure of the oil pump, and the scale inhibitors It is brought out by the production fluid before reaching the designated position, the protection period is short, the dosing process is complicated, the dosing is frequent, and the cost is high and a series of problems

The development of high-efficiency solid slow-release antiscalants has become an urgent need for oilfield water treatment. At present, researchers have developed some solid antiscalant products, but the release rate is unstable and difficult to adjust, and they will fall off in pieces during use. cause blockage