Scale inhibition particle and preparation method and application thereof

Abstract

The invention provides a scale inhibition particle and a preparation method and application thereof; the scale inhibition particle comprises a slow release core layer and a quick release outer layer,and the quick release outer layer wraps the slow release core layer. The slow release core layer comprises the following components, by mass: 30%-45% of a liquid scale inhibitor, 30%-45% of an inorganic carrier, 2%-15% of a filler, 10%-20% of a slow-release core layer adhesive and 1%-5% of a slow-release core layer cross-linking agent. And the quick release outer layer comprises the following components, by mass: 50%-65% of a solid scale inhibitor, 30%-45% of an outer-layer adhesive and 5-8% of an outer-layer cross-linking agent. According to the invention, a certain proportion of solid and liquid scale inhibitors are added into matrixes of the quick release layer and the slow release layer to control the release speed of the scale inhibitor, and after the prepared scale inhibitor productis added into a wellbore, the high-concentration scale inhibitor can be quickly released at the early stage to be chelated with scale forming ions in water, so that scaling is basically inhibited. Andthen the scale inhibitor with a certain concentration is slowly released to maintain the concentration of the agent in the wellbore so as to achieve the purpose of long-term scale prevention.

Description

technical field [0001] The invention belongs to the field of oilfield chemistry, and in particular relates to a scale-inhibiting granule and a preparation method and application thereof. Background technique [0002] At present, most oil fields in my country have entered the middle and late stages of oil development, and the water content in the produced fluid is relatively high, and some oil fields have a water content as high as 90%. With the increase of water content, scaling problems in wellbores follow one after another. Among the numerous antiscaling processes, adding liquid antiscalants to oil and gas wells is the most commonly used and most economical and effective antiscaling measure, but there are the following problems: [0003] (1) Oil and gas wells have a large amount of fluid production. With the recovery of the production fluid, the added liquid scale inhibitor is easily carried out, and the effective protection period of the scale inhibitor is short; [0004...

AI Technical Summary

Problems solved by technology

[0003] (1) Oil and gas wells have a large amount of fluid production. With the recovery of the production fluid, the added liquid scale inhibitor is easily carried out, and the effective protection period of the scale inhibitor is short;

[0004] (2) The liquid antiscalant adheres to the oil pipe wall, and the utilization rate of the agent is low

When dosing chemicals, due to the high labor intensity and short dosing cycle, the production and benefits are affected;

[0005] (3) The dosing of liquid antiscalants requires the use of ground equipment and facilities such as high-pressure liquid injection pumps, containers, and pump trucks, which makes management difficult

However, the concentrated burst release and short validity period of the scale inhibitor caused by the dissolution of the polymer are the main problems that need to be improved at present.

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