阅读说明：本技术 一种中性除垢剂及其制备方法 (Neutral scale remover and preparation method thereof ) 是由 孙德旭 吴琼 贾庆升 高志卫 王海燕 李琳 梁秀红 尚朝晖 渠慧敏 戴群 于 2019-12-09 设计创作，主要内容包括：本发明公开了一种中性除垢剂及其制备方法,包括超分子除垢剂单体溶液、表面活性剂以及pH调节剂,采用特殊的原料配比制备得到超分子除垢剂单体,安全长效,与垢、金属均不会发生化学反应,通过分散、分子组装,实现剥离并分解垢,并最终稳定附着在金属表面,可以清除常规化学清洗难以清洗掉的油垢、泥垢、结晶垢、锈垢等难溶垢,并形成致密的保护膜,可保持油井的长期稳定运行防止后续垢的形成,实现长效除垢阻垢。(The invention discloses a neutral scale remover and a preparation method thereof, the neutral scale remover comprises a supermolecule scale remover monomer solution, a surfactant and a pH regulator, the supermolecule scale remover monomer is prepared by adopting a special raw material proportion, is safe and long-acting, does not have chemical reaction with scale and metal, realizes stripping and scale decomposition through dispersion and molecular assembly, and is finally stably attached to the surface of the metal, so that insoluble scales such as oil scale, mud scale, crystallization scale, rust scale and the like which are difficult to clean by conventional chemical cleaning can be removed, a compact protective film is formed, the long-term stable operation of an oil well can be maintained, the formation of subsequent scales is prevented, and the long-acting scale removal and scale inhibition are realized.)

1. The neutral scale remover is characterized by comprising the following raw materials in parts by weight: 90-105 parts of supermolecule scale remover monomer solution, 5-10 parts of surfactant and 0-1 part of pH regulator; wherein, the synthesis steps of the supermolecule detergent monomer solution are as follows: adding 50 parts of absolute ethyl alcohol into a reaction kettle, then adding 2-3 parts of polyethylene glycol, stirring at 1000r/min, after complete dissolution, adding 5-6 parts of p-aminobenzoic acid or 5-6 parts of 4-aminobenzenesulfonic acid, stirring at 1000r/min for 10min, raising the temperature to 60 ℃, then dropwise adding 7-9 parts of benzotriazole, simultaneously dropwise adding an acid activation initiator, raising the temperature to 80 ℃, and reacting for 8h to obtain the supermolecule scale remover monomer solution.

2. The neutral detergent of claim 1, wherein said acidic activating initiator is synthesized by the steps of:

dissolving 2-3 parts of sodium silicate in 20 parts of absolute ethyl alcohol, stirring and dissolving at the normal temperature of 25 ℃ and 1000r/min, then slowly dropwise adding 4-6 parts of ethylenediamine sodium triacetate or 3-5 parts of ethylenediamine tetraacetic acid disodium salt for 5min, dropwise adding 20-30 parts of polyepoxysuccinic acid for 15min, continuously dropwise adding 3-5 parts of initiator hydroxyethylidene diphosphonic acid for 5min, and then heating to 60 ℃ to prepare the acid activation initiator.

3. The neutral detergent as claimed in claim 1, wherein the dropping of benzotriazole and the acidic activating initiator is completed simultaneously, and the dropping time is 20-30 min.

4. The neutral detergent of claim 1, wherein the surfactant is one of fatty alcohol-polyoxyethylene ether or octadecyl dimethyl betaine.

5. The neutral detergent of claim 1, wherein the pH adjuster is one of sodium hydroxide or potassium hydroxide.

6. The neutral detergent of claim 1, having a pH of 6.5-7.0.

7. The method for preparing a neutral detergent according to claim 1, comprising the steps of: mixing and stirring the supermolecule scale remover monomer solution and the surfactant at the normal temperature of 25 ℃ at 1000r/min for 55-65min in proportion, and then adding a pH regulator to prepare the neutral scale remover.

Technical Field

The invention belongs to the technical field of a scale remover, and particularly relates to a neutral scale remover and a preparation method thereof.

Background

Scaling of the oil field downhole pipe string can cause production stoppage of an oil-water well, yield reduction, service life shortening and the like. The existing descaling agent commonly used in oil fields is mainly an acid system, so that the pipe column is corroded by acid descaling, the pipe column is damaged, the cost is increased, the production period is shortened, and even the production is stopped; meanwhile, the treated pipe column still continues to scale, so that scaling-descaling circulation is caused.

However, the strong acid cleaning agent has large addition amount, strong corrosivity and large toxicity, wastes water, labor and time in the whole cleaning process, pollutes the environment, has certain danger to equipment and operators, and is inconvenient to transport and store. In addition, many expensive industrial equipment is not suitable for use due to the strong corrosiveness of the strong acid cleaning agent. Compared with inorganic acid cleaning agents, organic acid cleaning agents are expensive, need to be operated at higher temperature, and are long in cleaning time and labor-intensive.

Disclosure of Invention

The invention provides a neutral detergent and a preparation method thereof, and solves the problems of corrosion of an acid detergent to a pipe column, high cost and low safety in the prior art and the problem of low scale removal rate of the conventional neutral detergent.

The specific technical scheme is as follows:

a neutral scale remover comprises the following raw materials in parts by weight: 90-105 parts of supermolecule scale remover monomer solution, 5-10 parts of surfactant and 0-1 part of pH regulator; wherein, the synthesis steps of the supermolecule detergent monomer solution are as follows: adding 50 parts of absolute ethyl alcohol into a reaction kettle, then adding 2-3 parts of polyethylene glycol, stirring at 1000r/min, after complete dissolution, adding 5-6 parts of p-aminobenzoic acid or 5-6 parts of 4-aminobenzenesulfonic acid, stirring at 1000r/min for 10min, raising the temperature to 60 ℃, then dropwise adding 7-9 parts of benzotriazole, simultaneously dropwise adding an acid activation initiator, raising the temperature to 80 ℃, and reacting for 8h to obtain the supermolecule scale remover monomer solution.

Preferably, the synthesis steps of the acidic activated initiator are as follows:

dissolving 2-3 parts of sodium silicate in 20 parts of absolute ethyl alcohol, stirring and dissolving at the normal temperature of 25 ℃ and 1000r/min, then slowly dropwise adding 4-6 parts of ethylenediamine sodium triacetate or 3-5 parts of ethylenediamine tetraacetic acid disodium salt for 5min, dropwise adding 20-30 parts of polyepoxysuccinic acid for 15min, continuously dropwise adding 3-5 parts of initiator hydroxyethylidene diphosphonic acid for 5min, and then heating to 60 ℃ to prepare the acid activation initiator.

Preferably, the dropping of the benzotriazole and the acidic activation initiator is completed simultaneously, and the dropping time is 20-30 min.

Preferably, the surfactant is one of fatty alcohol-polyoxyethylene ether or octadecyl dimethyl betaine.

Preferably, the pH regulator is one of sodium hydroxide or potassium hydroxide.

Preferably, the method comprises the following steps: mixing and stirring the supermolecule scale remover monomer solution and the surfactant at the normal temperature of 25 ℃ at 1000r/min for 55-65min in proportion, and then adding a pH regulator to prepare the neutral scale remover.

Preferably, the pH value of the neutral detergent is 6.5-7.0.

Has the advantages that:

1. the scale remover prepared by the invention is safe and long-acting, can not have chemical reaction with scale and metal, can realize stripping and decomposition of the scale through dispersion and molecular assembly, and finally stably adheres to the surface of the metal, can remove oil scale, mud scale, crystal scale, rust scale and other insoluble scales which are difficult to be cleaned by conventional chemical cleaning, forms a compact protective film, can keep long-term stable operation of an oil well to prevent subsequent scale from being formed, and realizes long-acting scale removal and scale inhibition.

2. When in use, the neutral descaling agent is added into the system through a pump according to a certain proportion without pulling out a pipe column, so that online cleaning and descaling are realized, the operation cost is reduced, the economic loss is reduced, and the labor and maintenance cost is saved.

3. The pH value of the scale remover disclosed by the invention is 6.5-7.0, the agent does not corrode equipment, the corrosion degree of the agent on metal surfaces is far lower than the I-level standard specified by the oil field industry standard, and the scale remover belongs to an environment-friendly, pollution-free and long-acting scale removing and inhibiting system; the neutral scale remover has no heavy metal pollution, no pollution to the environment and safety to operators and equipment; the method is environment-friendly, the medicament is hermetically conveyed along with the crude oil, and the method has no environmental pollution and is green and environment-friendly.

Detailed Description