CN110452674A - CO2Drive injection well annular protective liquid and preparation method thereof - Google Patents
CO2Drive injection well annular protective liquid and preparation method thereof Download PDFInfo
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- CN110452674A CN110452674A CN201810433338.4A CN201810433338A CN110452674A CN 110452674 A CN110452674 A CN 110452674A CN 201810433338 A CN201810433338 A CN 201810433338A CN 110452674 A CN110452674 A CN 110452674A
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/52—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/54—Compositions for in situ inhibition of corrosion in boreholes or wells
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- C—CHEMISTRY; METALLURGY
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- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/58—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids
- C09K8/584—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids characterised by the use of specific surfactants
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/58—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids
- C09K8/588—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids characterised by the use of specific polymers
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Abstract
The present invention provides a kind of CO2Drive injection well annular protective liquid and preparation method thereof.The annular protective liquid includes corrosion inhibiter, density adjuster, fungicide, pH adjusting agent, alcohol and water.The component of the annular protective liquid has good concertedness, can control note CO2The etching problem of well annular space; the annular protective liquid has the advantages that low Auto-regulating System of Density of Heavy Medium range is big, bactericidal effect is good, pH value control effect is good, can inhibit tubing and casing well burn into environmental protection preparation cost and lower condensation point; it is simple and easy to operate that method is prepared in situ, and reliable performance stablizes easily storage.CO of the invention2Drive injection well annular protective liquid and preparation method are suitable for the annular space of producing well and gas injection, water injection well, can control the etching problem of annular space tubing and casing well.
Description
Technical field
The present invention relates to petrochemistry technical fields, in particular to a kind of CO2Drive injection well annular protective liquid and its
Preparation method.
Background technique
With the further investigation of gas injecting mining, there is the tubing and casing etching problem of annular space in most of oil field in China.Note
Gas during entering is scurried into annular space and forms complicated corrosive environment with occluded water, the corrosion bacteria etc. in annular space, can make
Tubing and casing corrosion failure problem is increasingly severe, and corrosion failure occurs so as to cause tubing and casing, shortens the military service of pit shaft and equipment
Service life can be such that oil well scraps when serious, cause huge economic loss.Annular protective liquid is because having good suppression to tubing and casing corrosion
Production is used, and can be reduced the pressure difference of oil pipe and annular space and be widely used.
At present for inhibiting CO2The annular protective liquid research of corrosion is more, but is directed to note when oil field produces at low temperature
It is less to enter the corrosion protection Study on Problems of the condensation point problem and tubing and casing of liquid in the gas phase, these be all in produced on-site urgently
It solves the problems, such as.Inhibition CO in the prior art2The annular protective liquid of corrosion mainly has the defect of following several respects:
Defect one: the pH value control of annular protective liquid is bad, cannot keep it in suitable range, in addition to will affect
Stability is sterilized, also will increase the risk of the tubing and casing fouling of annular space, tubing and casing fouling will affect the normal production of oil well.
Defect two: just under hot environment anti-corrosion and sterilization studied, for the injection under low temperature environment
Liquid condensation point problem is not studied.
Based on the above reasons, it needs to CO2Drive injection well annular protective liquid is further studied, to solve at low temperature
The etching problem of the condensation point problem of liquid and the tubing and casing of annular space is injected when production.
Summary of the invention
The main purpose of the present invention is to provide a kind of CO2Drive injection well annular protective liquid and preparation method thereof, to solve
Influence of the temperature when etching problem and produced on-site of the tubing and casing of annular space to annular protective liquid performance in the prior art is asked
Topic.
To achieve the goals above, according to an aspect of the invention, there is provided a kind of CO2The protection of drive injection well annular space
Liquid comprising corrosion inhibiter, density adjuster, fungicide, pH adjusting agent, alcohol and water.
Further, by volume percentage, the annular protective liquid include 0.5~10% corrosion inhibiter, 0.5~10%
Density adjuster, 0.5~10% fungicide, 0.5~10% pH adjusting agent, 0.5~10% alcohol and the water of surplus.
Further, by volume percentage, which includes 5~8% corrosion inhibiter, 8~10% density
Regulator, 1.5~3.5% fungicide, 3~5% pH adjusting agent, 1~3% alcohol and the water of surplus.
Further, which further includes one of oxygen scavenger, surfactant and ammoniac compounds or more
Kind.
Further, by volume percentage, the annular protective liquid further include 0.5~10% oxygen scavenger, 0.5~10%
Surfactant and 0.5~10% ammoniac compounds.
Further, by volume percentage, the annular protective liquid further include 3~4% oxygen scavenger, 0.5~1.5%
Surfactant and 3~5% ammoniac compounds.
Further, the corrosion inhibiter be dodecenylsuccinic acid single ethanol amide, dodecenylsuccinic acid diethanol amine and
One of dodecenylsuccinic acid half ester is a variety of.
Further, which is one of sodium formate, potassium formate and calcium formate or a variety of.
Further, which is metronidazole bi-quaternary ammonium salt and/or metconazole.
Further, which is potassium hydroxide and/or calcium hydroxide.
Further, which is ethylene glycol and/or POLYPROPYLENE GLYCOL.
Further, which is one of D-araboascorbic acid sodium, acetaldoxime and sulphite or a variety of.
Further, which is heavy alkylbenzene sulfonate sodium, heavy alkylbenzene sulfonic acid potassium and heavy alkylbenzene sulfonic acid
One of magnesium is a variety of.
Further, which is ammonia nitrogen.
According to another aspect of the present invention, a kind of CO is provided2The preparation method of drive injection well annular protective liquid comprising
Following steps: each component is mixed according to the formula of annular protective liquid, obtains annular protective liquid.
Further, the preparation method of the annular protective liquid includes the following steps: to use water injecting pump to Agitation Tank Che Lijia
Enter water；Corrosion inhibiter, density adjuster, fungicide, pH adjusting agent and alcohol is added in Xiang Shuizhong, after mixing, obtains annular protective liquid.
Further, the preparation method of the annular protective liquid includes the following steps: that corrosion inhibiter, Auto-regulating System of Density of Heavy Medium are added into water
After the step of agent, fungicide, pH adjusting agent and alcohol, the preparation method includes that oxygen scavenger, surfactant is further added
And ammoniac compounds, the step of obtaining annular protective liquid after mixing.
Apply the technical scheme of the present invention, annular protective liquid includes following components: corrosion inhibiter, density adjuster, fungicide,
PH adjusting agent, alcohol and water.The component of the annular protective liquid has good concertedness, can control note CO2The corrosion of well annular space is asked
Topic, the annular protective liquid have that Auto-regulating System of Density of Heavy Medium range is big, bactericidal effect is good, pH value control effect is good, can inhibit oil jacket well
The advantages that corrosion and fouling of pipe, environmentally friendly preparation cost be low and lower condensation point, it is simple and easy to operate to be prepared in situ method, and property
It can reliable and stable easy storage.CO of the invention2Drive injection well annular protective liquid and preparation method are suitable for producing well and gas injection, note
The annular space of well can control the etching problem of annular space tubing and casing well.
Specific embodiment
It should be noted that in the absence of conflict, the features in the embodiments and the embodiments of the present application can phase
Mutually combination.Below in conjunction with embodiment, the present invention will be described in detail.
The application is described in further detail below in conjunction with specific embodiment, these embodiments should not be understood as limitation originally
Apply for range claimed.
As described in background technology part, existing annular protective liquid can not effectively solve oil field and produce at low temperature
When injection liquid condensation point problem and annular space tubing and casing etching problem.To solve the above-mentioned problems, the present invention provides one kind
Provide a kind of CO2Drive injection well annular protective liquid comprising corrosion inhibiter, density adjuster, fungicide, pH adjusting agent, alcohol and
Water.
The component of the annular protective liquid has good concertedness, can control note CO2The etching problem of well annular space, the annular space
Protection liquid have Auto-regulating System of Density of Heavy Medium range is big, bactericidal effect is good, pH value control effect is good, can inhibit tubing and casing well corrosion and
The advantages that fouling, environmentally friendly preparation cost be low and lower condensation point, it is simple and easy to operate to be prepared in situ method, and reliable performance is stablized
Easily storage.CO of the invention2Drive injection well annular protective liquid and preparation method are suitable for the annular of producing well and gas injection, water injection well
Space can control the etching problem of annular space tubing and casing well.
In order to further balance the effect of each component and more give full play to synergistic effect between each component, it is a kind of preferably
Embodiment in, by volume percentage, which includes 0.5~10% corrosion inhibiter, 0.5~10% density
Regulator, 0.5~10% fungicide, 0.5~10% pH adjusting agent, 0.5~10% alcohol and the water of surplus.More preferably
Ground, by volume percentage, the annular protective liquid include 5~8% corrosion inhibiter, 8~10% density adjuster, 1.5~
The water of 3.5% fungicide, 3~5% pH adjusting agent, 1~3% alcohol and surplus.
Using above-mentioned annular protective liquid provided by the invention, if add simultaneously corrosion inhibiter, density adjuster, fungicide,
PH adjusting agent, alcohol and water can effectively solve the problems, such as the etching problem of the condensation point of injection liquid and the tubing and casing of annular space.A kind of excellent
In the embodiment of choosing, which further includes one of oxygen scavenger, surfactant and ammoniac compounds or a variety of.
Oxygen scavenger, which is added, can further provide for the oxygen-free environment of system, improve corrosion resistance.Surfactant is added to advantageously reduce
Interfacial tension between oil and water.Ammoniac compounds are added and are conducive to the gaseous corrosion for further solving the problems, such as tubing and casing.
In order to further balance the effect between each component, in a preferred embodiment, by volume percentage,
The annular protective liquid further include 0.5~10% oxygen scavenger, 0.5~10% surfactant and 0.5~10% Ammonia
Close object.It is highly preferred that pressing volume percentage, which further includes 3~4% oxygen scavenger, 0.5~1.5% table
Face activating agent and 3~5% ammoniac compounds.
In a preferred embodiment, which is dodecenylsuccinic acid derivative.In a kind of preferred reality
It applies in mode, which is dodecenylsuccinic acid single ethanol amide, dodecenylsuccinic acid diethyl
One of hydramine and dodecenylsuccinic acid half ester are a variety of.Compared to other corrosion inhibiter, above-mentioned inhibition that the present invention uses
Agent has the preferable advantage of oil-soluble, and it is with stronger adsorption capacity, and jail can be formed in metal surface by being added into oil
Solid oil film to protecting metal surface to be not rusted, to prevent the CO into annular space2Corrosion oil annular pipe.
In a preferred embodiment, which is formates.In a preferred embodiment, should
Formates is one of sodium formate, potassium formate and calcium formate or a variety of.Annular space can be increased using these types of density adjuster
The density for protecting liquid makes it to meet 1.1 to 1.3g/cm in actual production3Density requirements.Moreover, these types of density tune
The corrosivity for saving agent is lower, and bio-toxicity is small, enriching is low, and has the characteristics that low viscosity, low crystalline temperature.Simultaneously, moreover it is possible to press down
Microorganism growth processed has certain molten dirt, scale removal ability.In addition, its strong inhibition capability, being conducive to protect reservoir, and can weigh
It is multiple to utilize.
In a preferred embodiment, which is metronidazole bi-quaternary ammonium salt and/or metconazole.The fungicide pair
The growth of the biological bacteriums such as sulfate reducing bacteria, saprophytic bacteria and iron bacteria is inhibited, can effectively prevent bacterial corrosion
Tubing and casing, and the drug resistance that will not cause above-mentioned biological bacterium is used for a long time.
In a preferred embodiment, which is potassium hydroxide and/or calcium hydroxide.It can be neutralized
CO2And H2The acidity of S effectively prevent corrosion of the sour gas for tubing and casing.Meanwhile the pH adjusting agent can also be controlled effectively
The pH value of annular protective liquid is kept it in suitable range, to reduce the risk of the tubing and casing fouling of annular space, prevents oil
The normal production of sleeve scaling influence oil well.
In a preferred embodiment, which is in D-araboascorbic acid sodium, acetaldoxime and sulphite
It is one or more.The oxygen scavenger can further eliminate the oxygen of annular protective liquid, prevent the oxygen in annular protective liquid from corroding
Tubing and casing.Oxygen corrosion be most generally be also most important tubing and casing corrosion phenomenon.Even if oxygen content is lower than 1mg/ in water or solution
L, it is also possible to extremely serious corrosion be caused to occur.D-araboascorbic acid sodium contains organic acid anion, which contains
Reproducibility group can remove the dissolved oxygen in aqueous solution, so that oxygen corrosion battery is difficult to be formed, to inhibit corruption of the oxygen to metal
Erosion.Meanwhile organic salt ionization after product to the CO in medium2And H2S has neutralization, also inhibits CO2And H2The corrosion of S；
In addition, it will not pollute water source, and will not generate when reaction with corrosive product, tubing and casing will not be aggravated
Corrosion failure.
In a preferred embodiment, which is heavy alkylbenzene sulfonate.
In a preferred embodiment, which is sodium heavy alkyl benzene sulfonate, heavy alkylbenzene sulfonic acid
One of potassium and heavy alkylbenzene sulfonic acid magnesium are a variety of.Compared to other surfaces activating agent, these types of surfactant can be more
It is effectively reduced oil and water interfacial tension, and interfacial tension performance is stablized.
In a preferred embodiment, which is ethylene glycol and/or POLYPROPYLENE GLYCOL.Be conducive to further drop using alcohol
The condensation point of low annular protective liquid, make its can in low temperature proper flow.
In a preferred embodiment, which is ammonia nitrogen.Ammonia nitrogen is easy to volatilize, and it is slow to serve as gas phase
The effect for losing agent, plays better protection to the tubing and casing in gaseous environment.
The application annular protective liquid claimed is water base annular protective liquid.Relative to oil base annulus protection fluid, water
Base annular protective liquid has the advantages that preparation cost is low and environmentally friendly.
In addition, according to another aspect of the present invention, providing a kind of CO2The preparation method of drive injection well annular protective liquid,
It includes the following steps: to mix each component according to the formula of annular protective liquid, obtains annular protective liquid.
In a preferred embodiment, the preparation method of the annular protective liquid includes the following steps: using water injecting pump
Water is added in Agitation Tank vehicle；Corrosion inhibiter, density adjuster, fungicide, pH adjusting agent and alcohol is added in Xiang Shuizhong, after mixing, obtains
To annular protective liquid.
The component of the annular protective liquid has good concertedness, can control note CO2The etching problem of well annular space, the annular space
Protection liquid have Auto-regulating System of Density of Heavy Medium range is big, bactericidal effect is good, pH value control effect is good, can inhibit tubing and casing well corrosion and
The advantages that fouling, environmentally friendly preparation cost be low and lower condensation point, it is simple and easy to operate to be prepared in situ method, and reliable performance is stablized
Easily storage.CO of the invention2Drive injection well annular protective liquid and preparation method are suitable for the annular of producing well and gas injection, water injection well
Space can control the etching problem of annular space tubing and casing well.
In a preferred embodiment, the preparation method of the annular protective liquid includes the following steps: to be added into water
After the step of corrosion inhibiter, density adjuster, fungicide, pH adjusting agent and alcohol, the preparation method includes that further addition removes
Oxygen agent, surfactant and ammoniac compounds, the step of obtaining annular protective liquid after mixing.
Beneficial effects of the present invention are further illustrated by the following examples:
Embodiment one
The present invention is compounded by following raw material: dodecenylsuccinic acid single ethanol amide 5%, sodium formate 8%, metronidazole
Bi-quaternary ammonium salt 1.5%, potassium hydroxide 3%, D-araboascorbic acid sodium 3%, sodium heavy alkyl benzene sulfonate 0.5%, POLYPROPYLENE GLYCOL 1%,
Ammonia nitrogen 3%, surplus are water.
Specific preparation step are as follows:
Step 1: first with water injecting pump toward quantitative water is added in tank car；
Step 2: and then sequentially add the double quaternary ammoniums of dodecenylsuccinic acid single ethanol amide 5%, sodium formate 8%, metronidazole
Salt 1.5%, potassium hydroxide 3%, D-araboascorbic acid sodium 3%, sodium heavy alkyl benzene sulfonate 0.5%, POLYPROPYLENE GLYCOL 1%, ammonia nitrogen
3%, side edged is stirred with blender, is configured to homogeneous solution；
Agitation Tank vehicle: being connected by step 3 with threeway and pipeline with injection pump, and the outlet end of threeway is connect with operation annular space,
After test pipeline pressure meets regulation, by prepared annular protective liquid uniformly, be continuously injected into annular space.
Embodiment two
The present invention is compounded by following raw material: dodecenylsuccinic acid single ethanol amide 6%, sodium formate 9%, metronidazole
Bi-quaternary ammonium salt 2.5%, potassium hydroxide 4%, D-araboascorbic acid sodium 3.5%, sodium heavy alkyl benzene sulfonate 1%, POLYPROPYLENE GLYCOL 2%,
Ammonia nitrogen 4%, surplus are water.
Specific preparation step are as follows:
Step 1: first with water injecting pump toward quantitative water is added in tank car；
Step 2: and then sequentially add the double quaternary ammoniums of dodecenylsuccinic acid single ethanol amide 6%, sodium formate 9%, metronidazole
Salt 2.5%, potassium hydroxide 4%, D-araboascorbic acid sodium 3.5%, sodium heavy alkyl benzene sulfonate 1%, POLYPROPYLENE GLYCOL 2%, ammonia nitrogen
4%, side edged is stirred with blender, is configured to homogeneous solution；
Agitation Tank vehicle: being connected by step 3 with threeway and pipeline with injection pump, and the outlet end of threeway is connect with operation annular space,
After test pipeline pressure meets regulation, by prepared annular protective liquid uniformly, be continuously injected into annular space.
Embodiment three
The present invention is compounded by following raw material: dodecenylsuccinic acid single ethanol amide 8%, sodium formate 10%, first nitre
Azoles bi-quaternary ammonium salt 3.5%, potassium hydroxide 5%, D-araboascorbic acid sodium 4%, sodium heavy alkyl benzene sulfonate 1.5%, POLYPROPYLENE GLYCOL
3%, ammonia nitrogen 5%, surplus are water.
Specific preparation step are as follows:
Step 1: first with water injecting pump toward quantitative water is added in tank car；
Step 2: and then sequentially add dodecenylsuccinic acid single ethanol amide 8%, sodium formate 10%, metronidazole double seasons
Ammonium salt 3.5%, potassium hydroxide 5%, D-araboascorbic acid sodium 4%, sodium heavy alkyl benzene sulfonate 1.5%, POLYPROPYLENE GLYCOL 3%, amino
Nitrogen 5%, side edged are stirred with blender, are configured to homogeneous solution；
Agitation Tank vehicle: being connected by step 3 with threeway and pipeline with injection pump, and the outlet end of threeway is connect with operation annular space,
After test pipeline pressure meets regulation, by prepared annular protective liquid uniformly, be continuously injected into annular space.
Example IV
The present invention is compounded by following raw material: dodecenylsuccinic acid diethanol amine 5%, potassium formate 8%, metronidazole are double
Quaternary ammonium salt 1.5%, calcium hydroxide 3%, acetaldoxime 3%, heavy alkylbenzene sulfonic acid potassium 0.5%, POLYPROPYLENE GLYCOL 1%, ammonia nitrogen 3%,
Surplus is water.
Specific preparation step are as follows:
Step 1: first with water injecting pump toward quantitative water is added in tank car；
Step 2: and then sequentially add dodecenylsuccinic acid diethanol amine 5%, potassium formate 8%, metronidazole bi-quaternary ammonium salt
1.5%, calcium hydroxide 3%, acetaldoxime 3%, heavy alkylbenzene sulfonic acid potassium 0.5%, POLYPROPYLENE GLYCOL 1%, ammonia nitrogen 3%, side edged
It is stirred with blender, is configured to homogeneous solution；
Agitation Tank vehicle: being connected by step 3 with threeway and pipeline with injection pump, and the outlet end of threeway is connect with operation annular space,
After test pipeline pressure meets regulation, by prepared annular protective liquid uniformly, be continuously injected into annular space.
Embodiment five
The present invention is compounded by following raw material: dodecenylsuccinic acid half ester 5%, calcium formate 8%, metconazole 1.5%,
Calcium hydroxide 3%, sulphite 3%, heavy alkylbenzene sulfonic acid magnesium 0.5%, ethylene glycol 1%, ammonia nitrogen 3%, surplus are water.
Specific preparation step are as follows:
Step 1: first with water injecting pump toward quantitative water is added in tank car；
Step 2: and then sequentially add dodecenylsuccinic acid half ester 5%, calcium formate 8%, metconazole 1.5%, hydroxide
Calcium 3%, sulphite 3%, heavy alkylbenzene sulfonic acid magnesium 0.5%, ethylene glycol 1%, ammonia nitrogen 3%, side edged are carried out with blender
It stirs, is configured to homogeneous solution；
Agitation Tank vehicle: being connected by step 3 with threeway and pipeline with injection pump, and the outlet end of threeway is connect with operation annular space,
After test pipeline pressure meets regulation, by prepared annular protective liquid uniformly, be continuously injected into annular space.
Comparing embodiment one
The present invention is compounded by following raw material: dodecenylsuccinic acid single ethanol amide 5%, sodium formate 8%, metronidazole
Bi-quaternary ammonium salt 1.5%, potassium hydroxide 3%, D-araboascorbic acid sodium 3%, sodium heavy alkyl benzene sulfonate 0.5%, POLYPROPYLENE GLYCOL 1%,
Surplus is water.
Specific preparation step are as follows:
Step 1: first with water injecting pump toward quantitative water is added in tank car；
Step 2: and then sequentially add the double quaternary ammoniums of dodecenylsuccinic acid single ethanol amide 5%, sodium formate 8%, metronidazole
Salt 1.5%, potassium hydroxide 3%, D-araboascorbic acid sodium 3%, sodium heavy alkyl benzene sulfonate 0.5%, POLYPROPYLENE GLYCOL 1%, side edged
It is stirred with blender, is configured to homogeneous solution；
Agitation Tank vehicle: being connected by step 3 with threeway and pipeline with injection pump, and the outlet end of threeway is connect with operation annular space,
After test pipeline pressure meets regulation, by prepared annular protective liquid uniformly, be continuously injected into annular space.
Comparing embodiment two
The present invention is compounded by following raw material: dodecenylsuccinic acid single ethanol amide 5%, sodium formate 8%, metronidazole
Bi-quaternary ammonium salt 1.5%, potassium hydroxide 3%, D-araboascorbic acid sodium 3%, sodium heavy alkyl benzene sulfonate 0.3%, POLYPROPYLENE GLYCOL 1%,
Ammonia nitrogen 3%, surplus are water.
Specific preparation step are as follows:
Step 1: first with water injecting pump toward quantitative water is added in tank car；
Step 2: and then sequentially add the double quaternary ammoniums of dodecenylsuccinic acid single ethanol amide 5%, sodium formate 8%, metronidazole
Salt 1.5%, potassium hydroxide 3%, D-araboascorbic acid sodium 3%, sodium heavy alkyl benzene sulfonate 0.3%, POLYPROPYLENE GLYCOL 1%, ammonia nitrogen
3%, side edged is stirred with blender, is configured to homogeneous solution；
Agitation Tank vehicle: being connected by step 3 with threeway and pipeline with injection pump, and the outlet end of threeway is connect with operation annular space,
After test pipeline pressure meets regulation, by prepared annular protective liquid uniformly, be continuously injected into annular space.
Comparing embodiment three
The present invention is compounded by following raw material: dodecenylsuccinic acid single ethanol amide 8%, sodium formate 12%, first nitre
Azoles bi-quaternary ammonium salt 3.5%, potassium hydroxide 5%, D-araboascorbic acid sodium 4%, sodium heavy alkyl benzene sulfonate 1.5%, POLYPROPYLENE GLYCOL
3%, ammonia nitrogen 5%, surplus are water.
Specific preparation step are as follows:
Step 1: first with water injecting pump toward quantitative water is added in tank car；
Step 2: and then sequentially add dodecenylsuccinic acid single ethanol amide 8%, sodium formate 12%, metronidazole double seasons
Ammonium salt 3.5%, potassium hydroxide 5%, D-araboascorbic acid sodium 4%, sodium heavy alkyl benzene sulfonate 1.5%, POLYPROPYLENE GLYCOL 3%, amino
Nitrogen 5%, side edged are stirred with blender, are configured to homogeneous solution；
Agitation Tank vehicle: being connected by step 3 with threeway and pipeline with injection pump, and the outlet end of threeway is connect with operation annular space,
After test pipeline pressure meets regulation, by prepared annular protective liquid uniformly, be continuously injected into annular space.
Comparative example one
The present invention is compounded by following raw material: dodecenylsuccinic acid single ethanol amide 5%, sodium formate 8%, metronidazole
It is bi-quaternary ammonium salt 1.5%, potassium hydroxide 3%, D-araboascorbic acid sodium 3%, sodium heavy alkyl benzene sulfonate 0.5%, ammonia nitrogen 3%, remaining
Amount is water.
Specific preparation step are as follows:
Step 1: first with water injecting pump toward quantitative water is added in tank car；
Step 2: and then sequentially add the double quaternary ammoniums of dodecenylsuccinic acid single ethanol amide 5%, sodium formate 8%, metronidazole
Salt 1.5%, potassium hydroxide 3%, D-araboascorbic acid sodium 3%, sodium heavy alkyl benzene sulfonate 0.5%, ammonia nitrogen 3%, side edged are used
Blender is stirred, and homogeneous solution is configured to；
Agitation Tank vehicle: being connected by step 3 with threeway and pipeline with injection pump, and the outlet end of threeway is connect with operation annular space,
After test pipeline pressure meets regulation, by prepared annular protective liquid uniformly, be continuously injected into annular space.
Comparative example two
The present invention is compounded by following raw material: dodecenylsuccinic acid single ethanol amide 5%, sodium formate 8%, metronidazole
It is bi-quaternary ammonium salt 1.5%, D-araboascorbic acid sodium 3%, sodium heavy alkyl benzene sulfonate 0.5%, POLYPROPYLENE GLYCOL 1%, ammonia nitrogen 3%, remaining
Amount is water.
Specific preparation step are as follows:
Step 1: first with water injecting pump toward quantitative water is added in tank car；
Step 2: and then sequentially add the double quaternary ammoniums of dodecenylsuccinic acid single ethanol amide 5%, sodium formate 8%, metronidazole
Salt 1.5%, D-araboascorbic acid sodium 3%, sodium heavy alkyl benzene sulfonate 0.5%, POLYPROPYLENE GLYCOL 1%, ammonia nitrogen 3%, side edged are used
Blender is stirred, and homogeneous solution is configured to；
Agitation Tank vehicle: being connected by step 3 with threeway and pipeline with injection pump, and the outlet end of threeway is connect with operation annular space,
After test pipeline pressure meets regulation, by prepared annular protective liquid uniformly, be continuously injected into annular space.
Prepared annular protective liquid performance is tested using N80, the properties of the annular protective liquid can be obtained
It is as follows:
(1) embodiment one: density 1.14g/cm3；PH value is 7.9；Aqueous etching rate is 0.0573mm/a, corrosion inhibition rate
It is 89.5%；Gaseous corrosion rate 0.0154mm/a, corrosion inhibition rate 94.3%；Deoxygenation rate is 98.1%；Sterilizing rate is 98.2%.
(2) embodiment two: density 1.17g/cm3；PH value is 8.2；Aqueous etching rate 0.0511mm/a, corrosion inhibition rate are
89.9%；Gaseous corrosion rate 0.0130mm/a, corrosion inhibition rate 94.8%；Deoxygenation rate is 98.5%, sterilizing rate 99.1%.
(3) embodiment three: density 1.21g/cm3；PH value is 8.5；Aqueous etching rate 0.0403mm/a, corrosion inhibition rate are
93.9%；Gaseous corrosion rate 0.0102mm/a, corrosion inhibition rate 95.1%；Deoxygenation rate is 99.8%, sterilizing rate 99.9%.
(4) example IV: density 1.19g/cm3；PH value is 8.3；Aqueous etching rate 0.0521mm/a, corrosion inhibition rate are
92.7%；Gaseous corrosion rate 0.0138mm/a, corrosion inhibition rate 94.9%；Deoxygenation rate is 98.7%, sterilizing rate 99.3%.
(5) embodiment five: density 1.20g/cm3；PH value is 8.6；Aqueous etching rate 0.0422mm/a, corrosion inhibition rate are
93.6%；Gaseous corrosion rate 0.0112mm/a, corrosion inhibition rate 95.5%；Deoxygenation rate is 99.9%, sterilizing rate 99.8%.
(6) comparing embodiment one: density 1.18g/cm3；PH value is 7.6；Aqueous etching rate is 0.0591mm/a, is delayed
Erosion rate is 88.9%；Gaseous corrosion rate 0.0354mm/a, corrosion inhibition rate 89.3%；Deoxygenation rate is 98.7%；Sterilizing rate is
97.9%.
(7) comparing embodiment two: density 1.15g/cm3；PH value is 7.8；Aqueous etching rate is 0.0773mm/a, is delayed
Erosion rate is 82.1%；Gaseous corrosion rate 0.0162mm/a, corrosion inhibition rate 93.5%；Deoxygenation rate is 97.6%；Sterilizing rate is
98.4%.
(8) comparing embodiment three: density 1.20g/cm3；PH value is 8.1；Aqueous etching rate 0.0412mm/a, inhibition
Rate is 92.7%；Gaseous corrosion rate 0.0113mm/a, corrosion inhibition rate 94.1%；Deoxygenation rate is 98.9%, sterilizing rate 99.7%.
(9) comparative example one: density 1.19g/cm3；PH value is 8.5；Aqueous etching rate is 0.0784mm/a, corrosion inhibition rate
It is 80.1%；Gaseous corrosion rate 0.0166mm/a, corrosion inhibition rate 89.7%；Deoxygenation rate is 98.2%；Sterilizing rate is 98.8%.
(10) comparative example two: density 1.21g/cm3；PH value is 7.7；Aqueous etching rate is 0.0678mm/a, inhibition
Rate is 86.3%；Gaseous corrosion rate 0.0164mm/a, corrosion inhibition rate 94.9%；Deoxygenation rate is 99.1%；Sterilizing rate is 91.2%.
Corrosion inhibition rate >=85% of the embodiment of the present invention one, embodiment two, embodiment three, example IV and embodiment five,
Deoxygenation rate >=95%, sterilizing rate >=95%, density is in 1.12-1.20g/m3Between.The above results illustrate the annular protective liquid energy
The corrosion of tubing and casing gas-liquid two-phase is enough efficiently controlled, degerming deoxygenation excellent performance, pH value control effect are good, stability is good and tool
There is lower condensation point, greatly improves the safe service life of underground equipment, significantly reduce production cost.
Compared with the component of comparing embodiment one, the component of embodiment one increases Ammonia, so as to cause gas in tubing and casing
Phase corrosion rate is remarkably decreased, and corrosion inhibition rate significantly rises, and can be controlled well the gaseous corrosion of annular space tubing and casing.
Compared with the component of comparing embodiment two, the amount of surfactant is revised as 0.5% by 0.3% by embodiment one,
Surfactant 0.5% can be effectively reduced oil and water interfacial tension, and interfacial tension performance is stablized, so as to cause oil jacket
Aqueous etching rate is remarkably decreased in pipe, and corrosion inhibition rate dramatically increases, and can be carried out well to the aqueous etching of annular space tubing and casing
Control.
Compared with the component of comparing embodiment three, the amount of density adjuster is revised as 10% by 12% by embodiment three, close
Degree regulator 10% equally can satisfy 1.1 to 1.3g/cm in actual production3Density requirements, be able to suppress microorganism growth,
With certain molten dirt, scale removal ability, environmental protection and it is minimized production cost.
Compared with the component of comparative example one, the component of embodiment one increases alcohols, so that the annular space in tubing and casing be made to protect
Protect liquid at low temperature can proper flow, aqueous etching rate is remarkably decreased, and corrosion inhibition rate significantly rises.
Compared with the component of comparative example two, the component of embodiment one increases pH adjusting agent, so as to efficiently control
The pH value of annular protective liquid in tubing and casing is kept it in suitable range, and sterilizing rate significantly rises, aqueous etching rate
It is remarkably decreased, corrosion inhibition rate significantly rises.
It can be seen from the above description that the above embodiments of the present invention realized the following chievements: the annular space is protected
Shield liquid is wide with density range, gas-liquid two-phase inhibition efficiency is good, degerming deoxygenation excellent performance, pH value control effect is good, stability is good
And the advantages that lower condensation point.Its preparation cost is low, and preparation method is simple, easily stored, and green non-pollution, is a kind of suitable
The scene of conjunction uses CO2The efficient annular protective liquid of drive injection well.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (9)
1. a kind of CO2Drive injection well annular protective liquid, which is characterized in that the annular protective liquid includes corrosion inhibiter, Auto-regulating System of Density of Heavy Medium
Agent, fungicide, pH adjusting agent, alcohol and water.
2. CO according to claim 12Drive injection well annular protective liquid, which is characterized in that volume percentage is pressed, it is described
Annular protective liquid include 0.5~10% corrosion inhibiter, 0.5~10% density adjuster, 0.5~10% it is described
Fungicide, 0.5~10% pH adjusting agent, 0.5~10% alcohol and the water of surplus；
Preferably, by volume percentage, the annular protective liquid include 5~8% the corrosion inhibiter, 8~10% it is described
Density adjuster, 1.5~3.5% fungicide, 3~5% pH adjusting agent, 1~3% the alcohol and surplus
Water.
3. CO according to claim 1 or 22Drive injection well annular protective liquid, which is characterized in that the annular protective liquid is also
Including one of oxygen scavenger, surfactant and ammoniac compounds or a variety of.
4. CO according to claim 32Drive injection well annular protective liquid, which is characterized in that volume percentage is pressed, it is described
Annular protective liquid further includes 0.5~10% oxygen scavenger, 0.5~10% surfactant and 0.5~10%
The ammoniac compounds；
Preferably, by volume percentage, the annular protective liquid further include 3~4% the oxygen scavenger, 0.5~1.5%
The surfactant and 3~5% the ammoniac compounds.
5. CO according to any one of claim 1 to 42Drive injection well annular protective liquid, which is characterized in that the inhibition
Agent is one in dodecenylsuccinic acid single ethanol amide, dodecenylsuccinic acid diethanol amine and dodecenylsuccinic acid half ester
Kind is a variety of；Preferably, the density adjuster is one of sodium formate, potassium formate and calcium formate or a variety of；Preferably, institute
Stating fungicide is metronidazole bi-quaternary ammonium salt and/or metconazole；Preferably, the pH adjusting agent is potassium hydroxide and/or hydroxide
Calcium；Preferably, the alcohol is ethylene glycol and/or POLYPROPYLENE GLYCOL.
6. CO according to claim 32Drive injection well annular protective liquid, which is characterized in that the oxygen scavenger is that D- is different anti-bad
One of hematic acid sodium, acetaldoxime and sulphite are a variety of；Preferably, the surfactant is heavy alkylbenzene sulfonate
One of sodium, heavy alkylbenzene sulfonic acid potassium and heavy alkylbenzene sulfonic acid magnesium are a variety of；Preferably, the ammoniac compounds are amino
Nitrogen.
7. CO according to any one of claim 1 to 62The preparation method of drive injection well annular protective liquid, feature exist
In the preparation method includes the following steps: to mix each component according to the formula of the annular protective liquid, obtains described
Annular protective liquid.
8. preparation method according to claim 7, which is characterized in that the preparation method includes the following steps:
Using water injecting pump to water is added in Agitation Tank vehicle；
Corrosion inhibiter, density adjuster, fungicide, pH adjusting agent and alcohol is added in Xiang Shuizhong, after mixing, obtains the annular space protection
Liquid.
9. preparation method according to claim 8, which is characterized in that the corrosion inhibiter, the density tune are added into water
After the step of saving agent, the fungicide, the pH adjusting agent and the alcohol, the preparation method includes that deoxygenation is further added
Agent, surfactant and ammoniac compounds, the step of obtaining the annular protective liquid after mixing.
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| CN201810433338.4A CN110452674A (en) | 2018-05-08 | 2018-05-08 | CO2Drive injection well annular protective liquid and preparation method thereof |
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| CN113583641A (en) * | 2021-08-25 | 2021-11-02 | 中盐金坛盐化有限责任公司 | Salt cavern hydrogen storage well annular protection liquid and preparation method thereof |
| CN114958327A (en) * | 2022-07-11 | 2022-08-30 | 中海石油(中国)有限公司湛江分公司 | High-temperature-resistant annular protection corrosion inhibitor and preparation method and application thereof |
| CN117388433A (en) * | 2023-10-11 | 2024-01-12 | 大庆永铸石油技术开发有限公司 | Annular long-acting protection liquid for well, preparation process and performance evaluation method |
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| CN114958327A (en) * | 2022-07-11 | 2022-08-30 | 中海石油(中国)有限公司湛江分公司 | High-temperature-resistant annular protection corrosion inhibitor and preparation method and application thereof |
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Application publication date: 20191115 |