阅读说明：本技术 一种多功能硫化物去除剂及其制备方法 (Multifunctional sulfide remover and preparation method thereof ) 是由 李晓东 张永刚 欧阳武 滕陆洋 唐国强 于 2019-10-17 设计创作，主要内容包括：本发明公开了一种多功能硫化物去除剂及其制备方法,包括水及除硫组分,其特征在于：还包括杀菌组分、螯合组分或缓蚀组分中的至少一种；所述除硫组分是三羟甲基磷、三羟甲基氨基甲烷、四羟甲基硫酸磷或四羟甲基氯化磷中的至少一种；解决现有硫化物去除剂功能单一且只能单独投加,若与其他药剂混合后投加会出现互相拮抗,降低药剂效果的问题。(The invention discloses a multifunctional sulfide remover and a preparation method thereof, wherein the multifunctional sulfide remover comprises water and a sulfur removal component, and is characterized in that: also comprises at least one of a bactericidal component, a chelating component or a corrosion inhibiting component; the sulfur removal component is at least one of trihydroxymethyl phosphorus, trihydroxymethyl aminomethane, tetrahydroxymethyl phosphorus sulfate or tetrahydroxymethyl phosphorus chloride; the problem of current sulphide remover function singleness and can only throw with alone, if throw with throwing after other medicaments are mixed and can appear antagonism each other, reduce the medicament effect is solved.)

1. The multifunctional sulfide remover comprises water and a sulfur removal component, and is characterized in that:

also comprises a sterilization component, a chelating component and a corrosion inhibition component;

the sulfur removal component is at least one of trihydroxymethyl phosphorus, trihydroxymethyl aminomethane, tetrahydroxymethyl phosphorus sulfate or tetrahydroxymethyl phosphorus chloride.

2. The multifunctional sulfide remover according to claim 1, wherein:

the bactericidal component is at least one of dithiocyano-methane, sodium dimethyldithiocarbamate, 2-dibromo-3-nitrilopropionamide, 2-nitro-2-bromo-1, 3-propanediol, 2-dibromo-2-nitroethanol, sodium dichloroisocyanurate, glutaraldehyde, isothiazolinone, dodecyl dimethyl benzyl ammonium chloride, polyhexamethylene guanidine or tri-n-butyl tetradecyl phosphine chloride.

3. The multifunctional sulfide remover according to claim 2, wherein:

the bactericidal component is one of isothiazolinone, dodecyl dimethyl benzyl ammonium chloride or 2-nitro-2-bromo-1, 3-propanediol.

4. The multifunctional sulfide remover according to claim 1, wherein:

the chelating component is at least one of ethylenediamine tetraacetic acid or a salt thereof, 2-hydroxyphosphonoacetic acid or a salt thereof, phosphonobutane tricarboxylic acid or a salt thereof, polyamino polyether methylene phosphonic acid or a salt thereof, iminodisuccinic acid or a salt thereof, polyaspartic acid or a salt thereof, hexamethylenediamine tetramethylene phosphonic acid or a salt thereof, a copolymer of acrylic acid and 2-acrylamide-2-methylpropanesulfonic acid, polyepoxysuccinic acid or a salt thereof, diethylenetriamine pentamethylene phosphonic acid or a salt thereof, aminotrimethylene phosphonic acid or a salt thereof, or ethylenediamine tetramethylene phosphonic acid or a salt thereof.

5. The multifunctional sulfide remover according to claim 4, wherein:

the chelating component is one of phosphonobutane tricarboxylic acid, diethylenetriamine pentamethylene phosphonic acid or diethylenetriamine pentamethylene phosphonic acid.

6. The multifunctional sulfide remover according to claim 1, wherein:

the corrosion inhibition component is at least one of sodium nitrite, sodium phosphate, zinc sulfate heptahydrate, sodium molybdate, octadecylamine or benzotriazole.

7. The multifunctional sulfide remover according to claim 6, wherein:

the corrosion inhibition component is one of sodium phosphate, benzotriazole or zinc sulfate heptahydrate.

8. The multifunctional sulfide remover according to claim 1, wherein:

the corrosion inhibitor comprises, by mass, 10-40 parts of a sulfur removal component, 10-40 parts of a sterilization component, 10-30 parts of a chelating component, 1-5 parts of a corrosion inhibition component and 5-15 parts of water.

9. A preparation method of a multifunctional sulfide remover is characterized by comprising the following steps:

adding the corrosion inhibition component into the water while stirring until the corrosion inhibition component is completely dissolved to obtain a first solution;

and (3) adding the desulphurization component, the sterilization component and the chelation component into the first solution in sequence, and then uniformly stirring to obtain the sulfur-removing composition.

10. The use method of the multifunctional sulfide remover is characterized by comprising the following steps:

the dosing concentration is 50 mg/L-200 mg/L.

Technical Field

The invention relates to an auxiliary agent for treating oilfield sewage, in particular to a chemical agent which can remove ferrous sulfide in oily sewage and has the functions of sterilization, corrosion inhibition and scale prevention.

Background

The existing method for removing ferrous sulfide in oil field sewage treatment is to add an oxidation type medicament (such as sodium hypochlorite) into an oil-water mixture polluted by ferrous sulfide, wherein the medicament can oxidize the ferrous sulfide into elemental sulfur and high-valence iron ions. However, the agent can only remove ferrous sulfide in the oily sewage, cannot kill bacteria in the oily sewage, and cannot play roles in preventing scale and slowing down corrosion.

The bacterial corrosion hazard exists in the oil field production all the time, and particularly with the development of secondary and tertiary oil recovery technologies, favorable conditions are created for the propagation of bacteria in an oil field system, so that the bacterial corrosion problem is increasingly serious. The growth, metabolism and propagation of microorganisms in oilfield systems can cause corrosion and damage to drilling equipment, water injection pipelines and other metallic materials, plugging of pipelines and water injection wells. The harm brings huge economic loss to the production and operation of the oil field, and the research on bacteria control and corrosion inhibition technology of the oil field system is urgently needed. The chemical sterilization method of adding bactericide into sewage to inhibit bacteria is the most commonly used sterilization method in oil fields. The common bactericides such as quaternary ammonium salts, organic bromides, organic sulfur compounds, aldehyde compounds and the like can only kill bacteria in water, but cannot remove harmful substances such as ferrous sulfide and the like existing and generated by bacterial metabolism.

Scaling and corrosion are among the most serious problems encountered in oilfield wastewater quality control. The scale is a poor heat conductor, and the formation of the scale greatly reduces the heat transfer effect; the deposition of scale can cause local corrosion of equipment and pipes, perforation destruction in a short time; the scale reduces the water flow sectional area, increases the water flow resistance and the conveying energy, and increases the cleaning cost and the downtime.

In order to enable the treated water quality to meet the standard requirement, four medicaments, namely a corrosion and scale inhibitor, a flocculating agent, a bactericide and a sulfide remover, are generally added into oil-containing sewage on site in the existing oilfield sewage treatment system.

In the process of adding various medicaments, two problems are often caused: firstly, the medicament has a plurality of types and large total medicament adding amount, which causes large medicament adding labor intensity and high comprehensive sewage treatment cost. The dosing concentration of each medicament is generally as follows: 500mg/l of sulfide remover, 100mg/l of bactericide, 50mg/l of scale inhibitor and 200mg/l of corrosion inhibitor, wherein the daily treatment amount is 10000m³For example, 5 tons of sulfide removing agent, 1 ton of bactericide, 0.5 ton of antiscaling agent and 2 tons of corrosion inhibitor need to be added every day, the labor intensity of field workers for adding the chemical is high, the chemical adding operation is complex, and the comprehensive treatment cost of sewage is high. Secondly, a plurality of medicaments can only be added respectively, and if the types of the medicaments are reduced, the water quality cannot reach the standard; if the mode of adding after mixing is adopted, mutual antagonism among the medicaments is easily caused, and the medicament effect is reduced. Such as oxidation type sulfide remover (sodium hypochlorite), bactericide, antiscaling agent, corrosion inhibitor, flocculating agent, etc., can react, thereby reducing the drug effect of each single agent.

Disclosure of Invention

In view of the above, the invention provides a multifunctional sulfide remover, which solves the problems that the existing sulfide remover has a single function and can only be added separately, and mutual antagonism occurs when the sulfide remover is added after being mixed with other medicaments, so that the medicament effect is reduced.

In another aspect, the invention provides a method for preparing and using the multifunctional sulfide remover.

In a first aspect, the multifunctional sulfide remover comprises water and a sulfur removing component, and is characterized in that:

also comprises a sterilization component, a chelating component and a corrosion inhibition component;

the sulfur removal component is at least one of trihydroxymethyl phosphorus, trihydroxymethyl aminomethane, tetrahydroxymethyl phosphorus sulfate or tetrahydroxymethyl phosphorus chloride.

Preferably, the bactericidal component is at least one of dithiocyano-methane, sodium dimethyldithiocarbamate, 2-dibromo-3-nitrilopropionamide, 2-nitro-2-bromo-1, 3-propanediol, 2-dibromo-2-nitroethanol, sodium dichloroisocyanurate, glutaraldehyde, isothiazolinone, dodecyl dimethyl benzyl ammonium chloride, polyhexamethylene guanidine, gemini quaternary ammonium salt YND1233, or tri-n-butyltetradecyl phosphine chloride.

Preferably, the bactericidal component is one of isothiazolinone, dodecyl dimethyl benzyl ammonium chloride or 2-nitro-2-bromo-1, 3-propanediol.

Preferably, the chelating component is at least one of ethylenediaminetetraacetic acid or a salt thereof, 2-hydroxyphosphonoacetic acid or a salt thereof, phosphonobutanetricarboxylic acid or a salt thereof, polyaminopolyetherylmethylenephosphonic acid or a salt thereof, iminodisuccinic acid or a salt thereof, polyaspartic acid or a salt thereof, hexamethylenediaminetetramethylenephosphonic acid or a salt thereof, a copolymer of acrylic acid and 2-acrylamido-2-methylpropanesulfonic acid, polyepoxysuccinic acid or a salt thereof, diethylenetriaminepentamethylenephosphonic acid or a salt thereof, aminotrimethylenephosphonic acid or a salt thereof, or ethylenediaminetetramethylenephosphonic acid or a salt thereof.

Preferably, the chelating component is one of phosphonobutane tricarboxylic acid, diethylenetriamine pentamethylenephosphonic acid, or diethylenetriamine pentamethylenephosphonic acid.

Preferably, the corrosion inhibition component is at least one of sodium nitrite, sodium phosphate, zinc sulfate heptahydrate, sodium molybdate, octadecylamine or benzotriazole.

Preferably, the corrosion inhibition component is one of sodium phosphate, benzotriazole or zinc sulfate heptahydrate.

Preferably, the water is deionized water.

Preferably, the composition comprises, by mass, 10-40 parts of a sulfur removal component, 10-40 parts of a sterilization component, 10-30 parts of a chelating component, 1-5 parts of a corrosion inhibition component and 5-15 parts of water.

In a second aspect, a method of making the multifunctional sulfide removing agent includes:

adding the corrosion inhibition component into the water while stirring until the corrosion inhibition component is completely dissolved to obtain a first solution;

and (3) adding the desulphurization component, the sterilization component and the chelation component into the first solution in sequence, and then uniformly stirring to obtain the sulfur-removing composition.

In a third aspect, the use method of the multifunctional sulfide remover is characterized in that:

the dosing concentration is 50 mg/L-200 mg/L.

The invention has the following beneficial effects:

the multifunctional sulfide remover integrates 4 functions of sterilization, corrosion inhibition, scale prevention and ferrous sulfide removal, and can ensure that the main control indexes of the water quality after sewage treatment are qualified by adding one medicament, thereby improving the field application effect; in addition, the dosage of the medicament is only 50 mg/L-200 mg/L, thereby greatly reducing the dosage of the medicament and lowering the comprehensive sewage treatment cost.

Detailed Description

The present invention will be described below based on examples, but it should be noted that the present invention is not limited to these examples. In the following detailed description of the present invention, certain specific details are set forth. However, the present invention may be fully understood by those skilled in the art for those parts not described in detail.

Also, unless the context clearly requires otherwise, throughout the description and the claims, the words "comprise", "comprising", and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is, the meaning of "includes but is not limited to".