Preparation method and application of super-long slow-release solid scale inhibitor

Abstract

The invention provides a preparation method of a super-long slow-release solid scale inhibitor. The super-long slow-release solid scale inhibitor comprises the following main components: polyvinyl alcohol, activated sodium lignin sulfonate, a modified polymer scale inhibitor and a cross-linking agent. The preparation method comprises the following steps: modifying polyaspartic acid by using sodium sulfanilate as a ring-opening medium to prepare a modified polymer scale inhibitor, and carrying out physical and chemical crosslinking on the scale inhibitor and a framework material by using a cross-linking agent by using polyvinyl alcohol and activated sodium lignin sulfonate as the framework material to prepare the super-long slow-release solid scale inhibitor. The scale inhibitor has the advantages of complete degradation, controllable release, small dosage, long scale inhibition effect retention time and the like, can realize a long-acting slow release effect, can obviously prolong the period of the oil well water injection scale inhibitor, reduces the dosing frequency, reduces the water injection oil extraction cost, and has obvious effects of improving the efficiency.

Description

technical field [0001] The invention relates to the technical field of industrial water treatment agents, in particular to a preparation method and application of an ultra-long sustained-release solid scale inhibitor. Background technique [0002] Scaling of circulating cooling water has brought many problems to industrial production, making water resources unable to be used rationally, especially in the process of oil field exploitation, oil well output sewage or formation water are often used as injection water, and divalent metal cations in the injected water enter the formation Immediately after, it will interact with the CO in the formation fluid 3 2- , SO 4 2- Such anions undergo chemical reactions, resulting in scaling; the scaling of injected water leads to blockage of downhole pipelines, valves and other devices, the flow area of ​​pipelines becomes smaller, and oil recovery efficiency decreases. Therefore, the use of scale inhibitors has become a research hotspo...

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Problems solved by technology

[0002] Scaling of circulating cooling water has brought many problems to industrial production, making water resources unable to be used rationally, especially in the process of oil field exploitation, oil well output sewage or formation water are often used as injection water, and divalent metal cations in the injected water enter the formation Immediately after, it will interact with the CO in the formation fluid 3 2- , SO 4 2- Such anions undergo a chemical reaction, resulting in scaling; the scaling of the injected water leads to the blockage of downhole pipelines, valves and other devices, the flow area of ​​the pipeline becomes smaller, and the oil recovery efficiency decreases. Therefore, the use of scale inhibitors has become a research hotspot in recent years.

Hu Qiaowei's invention patent (CN111115857A) and "Preparation and Performance of Long-lasting Slow-release Scale Inhibition Granules" published in "Petrochemical Industry" both use diatomite as the inorganic carrier and compound it with polyvinyl alcohol (PVA) , prepared anti-scaling particles with slow-release effect, although the coating material polyvinyl alcohol (PVA) is biodegradable, but the water resistance is particularly poor, low elasticity, low mechanical strength when forming a film, which greatly limits Its application is clear; the antiscalant ingredients selected are organic phosphonates, which are easy to pollute the environment, and have problems such as high cost, low coating, and non-biodegradable, and can only achieve a sustained release effect of 60 days

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