CN114752367A - Composite sterilization foaming agent for shale gas foam well, preparation method and application - Google Patents
Composite sterilization foaming agent for shale gas foam well, preparation method and application Download PDFInfo
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Abstract
The invention provides a composite sterilization foaming agent for a shale gas foam well, and a preparation method and application thereof. The composite sterilization foaming agent comprises the following components in parts by mass: 25-35 parts of betaine zwitterionic surfactant, 0-10 parts of fatty alcohol polyoxyethylene sulfate, 1-10 parts of C1-C5 aldehyde compound, 0-10 parts of quaternary ammonium salt surfactant, 0.5-2 parts of polyvinyl alcohol, 1-4 parts of C2-C3 alcohol compound, 4-8 parts of quinoline salt, 1-3 parts of hexamethylene tetramine and 50-60 parts of water. The composite sterilization foaming agent has good compatibility and can solve the problems of foam drainage of shale gas wells and bacterial corrosion of oil casings.
Description
Technical Field
The invention relates to the field of shale gas foam drainage gas production, in particular to a composite sterilization foaming agent for a shale gas foam well as a preparation method and application thereof.
Background
In the exploitation of shale gas, the gas production rate of a gas well is reduced, the liquid carrying capacity is reduced, the liquid outlet of a stratum cannot be brought out in time by the self capacity of the gas well, and the liquid carrying needs to be assisted by technologies such as foam drainage gas production and the like. The foam drainage gas production is a drainage stable-yield technology which is most applied to water-gas reservoirs, is most economical and effective, and comprises the steps of injecting a foaming agent into the bottom of a gas well, forming foam under the stirring of gas flow, reducing density, reducing slippage, improving the efficiency of gas flow with liquid, taking accumulated liquid out of a shaft in a foam form, injecting a defoaming agent in front of a gas-liquid separator on the ground to defoam the foam into liquid, and then separating gas from liquid in a separator.
The shale gas needs to be fractured in a large scale to obtain industrial gas flow, and the fracturing injection liquid amount of a single well currently exceeds 4 ten thousand square meters. At the beginning of shale gas development, most of the injected water is river water. Along with the scale development of shale gas, in order to reduce the consumption of water resources, the reutilization of fracturing flowback water is increased, so that the water used for the fracturing of the subsequent shale gas well is mostly used as the flowback water of other wells, and the insufficient water is supplemented by river water. The river water and the flowback water contain a certain amount of bacteria such as sulfate reducing bacteria, iron bacteria, saprophytic bacteria and the like. From the operation condition of the existing on-site production pipe column and gathering and transportation pipeline, the existence of the bacteria, especially the sulfate reducing bacteria, can cause corrosion on an oil pipe and a gas transmission pipeline, bring safety risk to the production of shale gas and greatly increase the investment. At present, some shale gas companies require that bactericides are added in all fracturing construction, and meanwhile, the ground production pipeline is considered to be filled with bactericides and corrosion inhibitors for corrosion protection. In the foam discharging device, both the used medicament and the dilution water may contain bacteria, so that a bactericide or a foaming agent with a bactericidal and corrosion-inhibiting effect is also required to be added, on one hand, bacteria are not introduced, and on the other hand, the bacteria in the gas well water are killed, so that an oil casing is protected.
The foaming agent is researched more at home and abroad. CN107353885A discloses a salt-resistant and oil-resistant foam drainage agent, which optimizes the oil-resistant foaming capacity, foam stabilizing capacity and liquid carrying capacity, and improves the methanol-resistant capacity, oil condensate resistance and mineralization resistance of the drainage agent. CN103773344A discloses a corrosion inhibition foaming agent for natural gas wells and a preparation method thereof, wherein the corrosion inhibition foaming agent is a medicament with double functions of corrosion inhibition and foaming. The method overcomes the influence of oil-soluble defoaming components in the corrosion inhibitor on the foaming performance of the foaming agent, and effectively solves the problems that the oil-water emulsification of the foaming agent, lipophilic solvents in the corrosion inhibitor and water produced by stratum occurs, and the produced emulsified matters block an oil pipe. CN111057530A discloses a foam scrubbing agent with high mineralization resistance and high temperature resistance and a preparation method thereof. The foam discharging agent system has higher foaming volume and liquid carrying amount under the conditions of 35% of ultrahigh salinity and high temperature of 150 ℃, and can be used for foam drainage gas recovery of high-temperature ultrahigh-salinity gas wells.
However, the above foaming agent does not relate to the use of a combination with a bactericide and a corrosion inhibitor. Some foaming agents have compatibility problems with bactericides and corrosion inhibitors, and the use of the foaming agent can affect the foaming performance of the foaming agent. Therefore, the reasonable compatibility of the foaming agent, the bactericide and the corrosion inhibitor needs to be researched.
Disclosure of Invention
In order to solve the problems, the invention aims to provide a composite sterilizing and foaming agent for a shale gas foam well, which has good compatibility and can solve the problems of foam drainage of the shale gas well and bacterial corrosion of an oil casing.
The invention also aims to provide a preparation method of the composite sterilization foaming agent.
The invention also aims to provide application of the composite sterilization foaming agent.
In order to achieve the purpose, in one aspect, the invention provides a sterilizing foaming agent for shale gas well foam drainage, which comprises the following components in parts by mass: 25-35 parts of betaine zwitterionic surfactant, 0-10 parts of fatty alcohol polyoxyethylene sulfate, 1-10 parts of C1-C5 aldehyde compound, 0-10 parts of quaternary ammonium salt surfactant, 0.5-2 parts of polyvinyl alcohol, 1-4 parts of C2-C3 alcohol compound, 4-8 parts of quinoline salt, 1-3 parts of hexamethylenetetramine and 50-60 parts of water.
According to some embodiments of the invention, the betaine zwitterionic surfactant is selected from a first class of betaines in combination with a C14-C18 alkyl propyl betaine.
According to some embodiments of the invention, the first type of betaine is selected from one or a combination of two or more of cocamidopropyl betaine, cocamidopropyl dimethyl betaine, dodecyl dimethyl betaine.
According to some embodiments of the invention, the fatty alcohol polyoxyethylene sulfate is a product prepared by reacting fatty alcohol polyoxyethylene ether with sulfamic acid.
According to some embodiments of the invention, the product is selected from one or a combination of two of fatty alcohol polyoxyethylene sulphate sodium salt and fatty alcohol polyoxyethylene sulphate ammonium salt.
According to some embodiments of the invention, the fatty alcohol polyoxyethylether has a fatty carbon chain number of 7 to 9 and an ethoxy number of 5.
According to some embodiments of the invention, the C1-C5 aldehyde compound is selected from one or a combination of two or more of formaldehyde, acetaldehyde, propionaldehyde, butyraldehyde and glutaraldehyde.
According to some embodiments of the invention, the quaternary ammonium surfactant is selected from the group consisting of C12-C16 alkyl trimethyl ammonium chlorides or bromides.
According to some embodiments of the invention, the polyvinyl alcohol comprises one or a combination of two of polyvinyl alcohol with an alcoholysis degree of 78% and polyvinyl alcohol with an alcoholysis degree of 88%.
According to some embodiments of the present invention, the degree of polymerization of the polyvinyl alcohol is 100-700. This degree of polymerization is the average degree of polymerization, according to "part 5 of the plastic polyvinyl alcohol material (PVAL) GB/T12010.5-2010: average polymerization degree measurement ".
According to some embodiments of the invention, the C2-C3 alcohol compound is selected from one or a combination of two of ethylene glycol and glycerol.
According to some embodiments of the present invention, the quinoline salt is a 50-85% aqueous solution of N-benzyl quinoline salt prepared by reacting quinoline and benzyl chloride as raw materials. The above reaction can be carried out according to the following steps: heating quinoline to 80-95 ℃, slowly dropwise adding benzyl chloride by using a dropping funnel, reacting at constant temperature for 6-10 hours after dropwise adding is finished, cooling to 40-50 ℃, and adding a proper amount of water to obtain the N-benzyl quinoline salt aqueous solution with the mass content of 50-85%.
According to some embodiments of the present invention, the composite bactericidal foaming agent, wherein the hexamethylenetetramine is an industrially pure white crystal.
According to some embodiments of the invention, the water is deionized or distilled water.
The compound of the betaine zwitterionic surfactants with different chain lengths has better foaming power, foam stability and liquid carrying performance; the anionic fatty alcohol polyoxyethylene sulfate and the zwitterionic betaine surfactant have synergistic effect on salt resistance; the low molecular aldehyde (C1-C5 aldehyde compound) and quaternary ammonium salt surfactant have bactericidal effect; polyvinyl alcohol and low molecular alcohol (C2-C3 alcohol compounds) have the effects of enhancing foam strength and slowing down the liquid discharge speed of a liquid film, and can improve the foam stabilizing performance of foam; the quinoline salt and the hexamethylenetetramine are matched to have a corrosion inhibition effect, so that the oil casing can be further protected.
The invention also provides a preparation method of the sterilizing foaming agent, which comprises the following steps: (1) heating water to 50-70 deg.C, adding polyvinyl alcohol while stirring; (2) after the polyvinyl alcohol is completely dissolved, sequentially adding a betaine zwitterionic surfactant, fatty alcohol polyoxyethylene sulfate, a C1-C5 aldehyde compound, a quaternary ammonium salt surfactant, a C2-C3 alcohol compound, quinoline salt and hexamethylenetetramine, and uniformly stirring and dissolving to obtain the composite sterilizing foaming agent.
The invention also provides application of the composite sterilizing foaming agent in drainage and gas recovery of the shale foam well.
According to some embodiments of the present invention, the composite bactericidal foaming agent is used at a concentration of 1000ppm to 2500ppm, calculated on water production.
The composite sterilizing foaming agent has the initial foam height of more than 150mm at 90 ℃, the foam height of more than 140mm in 5min, the liquid carrying amount of more than 150mL/15min and the sterilizing rate of 100%.
The invention has the beneficial effects that:
the composite sterilization foaming agent solves the compounding problem of various foaming components and sterilization components, can ensure that the foaming performance of the foaming components is not influenced by the sterilization components, and can also ensure that the sterilization performance of the sterilization components on sulfate reducing bacteria, iron bacteria and saprophytic bacteria is not influenced by the foaming components.
Aiming at foam drainage of shale gas, the invention provides a foaming agent formula with good foaming power, foam stability, liquid carrying capacity, sterilization and corrosion resistance effects by compounding, and solves the problems of foam drainage and bacterial corrosion of shale gas wells.
Detailed Description
In order to make those skilled in the art better understand the technical solutions of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, and not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort shall fall within the protection scope of the present application.
It should be noted that the terms "comprises" and "comprising," and any variations thereof, in the description and claims of this application are intended to cover a non-exclusive inclusion, such that a process, method, or composition that comprises a list of steps is not necessarily limited to those steps explicitly listed, but may include other steps not expressly listed or inherent to such process, method, or composition. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as the case may be.
It should be noted that, in the present application, the embodiments and features of the embodiments may be combined with each other without conflict.
Example 1
The embodiment provides a composite sterilization foaming agent for a shale gas foam well and a preparation method thereof, and the preparation method specifically comprises the following steps:
the foaming agent is prepared from 30% of cocamidopropyl betaine, 1% of C16 alkyl propyl betaine, 0.1% of C18 alkyl propyl betaine, 5% of glutaraldehyde, 1% of polyvinyl alcohol 388 (the polymerization degree is 300, the alcoholysis degree is 88%), 1% of ethylene glycol, 6% of N-benzyl quinoline salt, 1% of hexamethylenetetramine and 54.9% of deionized water. At the temperature of 90 ℃ and the dosage of 1.0g/L, the foaming power (initial foam height) is 188mm, the foam stability (5min foam height) is 178mm, the liquid carrying amount is 156mL/15min, and the sterilization rate of sulfate reducing bacteria, iron bacteria and saprophytic bacteria is 100%.
Example 2
The embodiment provides a composite sterilization foaming agent for a shale gas foam well and a preparation method thereof, and the preparation method specifically comprises the following steps:
the foaming agent is prepared from 30% of cocamidopropyl dimethyl betaine, 1% of C16 alkyl propyl betaine, 0.1% of C18 alkyl propyl betaine, 5% of glutaraldehyde, 1% of polyvinyl alcohol 588 (the polymerization degree is 500, the alcoholysis degree is 88%), 1% of ethylene glycol, 4% of N-benzyl quinoline salt, 3% of hexamethylenetetramine and 54.9% of deionized water. Under the conditions of 90 ℃ and 1.0g/L dosage, the foaming capacity (initial foam height) is 192mm, the foam stability (5min foam height) is 185mm, the liquid carrying amount is 154mL/15min, and the sterilization rate of sulfate reducing bacteria, iron bacteria and saprophytic bacteria is 100%.
Example 3
The embodiment provides a composite sterilization foaming agent for a shale gas foam well and a preparation method thereof, and the preparation method specifically comprises the following steps:
the foaming agent is prepared from 25% of cocamidopropyl betaine, 5% of cocamidopropyl dimethyl betaine, 3% of glutaraldehyde, 2% of formaldehyde, 1% of polyvinyl alcohol 388 (the polymerization degree is 300, and the alcoholysis degree is 88%), 1% of glycol, 5% of N-benzyl quinoline salt, 2% of hexamethylenetetramine, and 56% of deionized water. Under the conditions of 90 ℃ and 1.0g/L dosage, the foaming capacity (initial foam height) is 198mm, the foam stability (5min foam height) is 195mm, the liquid carrying amount is 162mL/15min, and the sterilization rate of sulfate reducing bacteria, iron bacteria and saprophytic bacteria is 100%.
Example 4
The embodiment provides a composite sterilization foaming agent for a shale gas foam well and a preparation method thereof, and the preparation method comprises the following steps:
the foaming agent is prepared from 30% of cocamidopropyl betaine, 1% of C16 alkyl propyl betaine, 0.1% of C18 alkyl propyl betaine, 5% of hexadecyl trimethyl ammonium chloride, 1.0% of glutaraldehyde, 1.0% of acetaldehyde, 1% of polyvinyl alcohol 388 (polymerization degree 300 and alcoholysis degree 88%), 3% of ethylene glycol, 6% of N-benzyl quinoline salt, 1% of hexamethylenetetramine and 50.9% of deionized water. Under the condition of the dosage of 1.0g/L and the temperature of 90 ℃, the foaming power (initial foam height) is 182mm, the foam stability (5min foam height) is 175mm, the liquid carrying amount is 158mL/15min, the sterilization rate of sulfate reducing bacteria is 100 percent, the sterilization rate of iron bacteria is 90 percent and the sterilization rate of saprophytic bacteria is 90 percent.
Example 5
The embodiment provides a composite sterilization foaming agent for a shale gas foam well and a preparation method thereof, and the preparation method specifically comprises the following steps:
the foaming agent is prepared from 25% of cocamidopropyl betaine, 1% of C16 alkyl propyl betaine, 0.1% of C18 alkyl propyl betaine, 8% of fatty alcohol polyoxyethylene sulfate, 2% of hexadecyl trimethyl ammonium chloride, 1% of glutaraldehyde, 1% of acetaldehyde, 1% of polyvinyl alcohol 388 (polymerization degree 300 and alcoholysis degree 88%), 3% of glycol, 4% of N-benzyl quinoline salt, 1% of hexamethylenetetramine and 52.9% of deionized water. Under the condition of the dosage of 1.0g/L and the temperature of 90 ℃, the foaming power (initial foam height) is 178mm, the foam stability (5min foam height) is 170mm, the liquid carrying amount is 162mL/15min, the sterilization rate of sulfate reducing bacteria is 100 percent, the sterilization rate of iron bacteria is 90 percent and the sterilization rate of saprophytic bacteria is 90 percent.
In the above examples, the evaluation reference "GB/T13173-2008 surfactant detergent test method" for foamability and foam stability is carried out according to the following steps:
1. 80g of sodium chloride and 20g of calcium chloride are weighed in a 500mL beaker, dissolved by distilled water, transferred to a 2000mL volumetric flask, diluted by distilled water and subjected to constant volume to 2000mL, so as to obtain 50g/L mineralized water.
2. Weighing 1.0g of the composite sterilizing foaming agent in a 100mL beaker, dissolving the composite sterilizing foaming agent in produced water or 50g/L mineralized water of a foam discharging well, transferring the mixture into a 1000mL volumetric flask, and carrying out constant volume to obtain a foaming agent solution.
3. The graduated tube is firmly installed on a proper support and is in a vertical state, and the water inlet tube and the water outlet tube are connected to the water outlet tube and the water return tube of the super thermostat through rubber tubes. The dropping tube is fixed at the orifice of the graduated tube by an adjustable movable clamp or a wooden or plastic plug seat matched with the dropping tube and the orifice of the graduated tube, so that the lower end of the stalk tube of the dropping tube is flush with the 90cm scale at the upper part of the graduated tube and is strictly aligned with the center of the graduated tube.
4. 50mL of the foaming agent solution was placed in a graduated tube and preheated at 90 ℃ for 15min, 250mL of the foaming agent solution was preheated in a thermostatic water bath at 90 ℃ for 15min, and 200mL of the preheated foaming agent solution was filled in the dropping tube by suction and mounted.
5. The stopwatch was started immediately and the starting foam height was read when the solution in the drip tube was run down by opening the stopcock of the drip tube and the second reading was taken at the end of 5 min. Repeating for 2-3 times. The foaming power is characterized by the initial foam height and the foam stability is characterized by the foam height at the end of 5 min.
Evaluation of liquid carrying capacity with reference to "Q/SY 1815-:
1. 80g of sodium chloride and 20g of calcium chloride are weighed in a 500mL beaker, dissolved by distilled water, transferred to a 2000mL volumetric flask, diluted by distilled water and subjected to constant volume to 2000mL, so as to obtain 50g/L mineralized water.
2. Weighing 1.0g of the composite sterilizing foaming agent in a 100mL beaker, dissolving the composite sterilizing foaming agent in produced water or 50g/L mineralized water of a foam discharging well, transferring the mixture into a 1000mL volumetric flask, and carrying out constant volume to obtain a foaming agent solution.
3. 200mL of foaming agent solution is taken to be preheated in a scale foaming pipe of a foam liquid carrying amount evaluation device for 15min at 90 ℃, a foam collector is started to circulate cooling water, a nitrogen gas source is opened, the flow of a flowmeter is adjusted to be 3.0L/min, gas enters the foaming pipe to generate foam and is carried out by gas flow, and the liquid volume after the foam is broken in the foam collector at room temperature after 15min is measured.
4. Adding a certain volume of defoaming agent solution into a foam collector in advance, and deducting the volume of the defoaming agent solution when the volume of liquid is read.
5. The arithmetical mean of the results of three replicates is taken as the measurement result, and the absolute difference of the replicates is not more than 2 mL.
The sterilization rate evaluation reference "SY/T0532-2012 oilfield injection water bacteria analysis method sterilization dilution method" is carried out according to the following steps:
according to the method specified in SY/T0532-.
Sterilization rate sigmaBCalculated as follows:
σB＝(B0-B1)/B0×100…………………………………………………(1)
in the formula:
σB: the sterilization rate in percent (%);
B0: sulfate reducing bacteria content in unit of per milliliter (per mL) in a field water sample;
B1: and adding 1.0g/L of the composite sterilization foaming agent to the site water sample to obtain the sulfate reducing bacteria content with the unit of per milliliter (per mL).
The analytical procedure was as follows:
1. respectively taking 7 bacteria test bottles filled with sulfate reducing bacteria, saprophytic bacteria and iron bacteria culture media, sequentially arranging the bacteria test bottles, and prying open a top cover;
2. disinfecting the top cover of the opened test bottle and the hands of an operator by using a 75% alcohol cotton ball;
3. 1mL of on-site water sample without the composite sterilizing foaming agent is sucked by a sterile syringe and injected into a first bottle, and the mixture is shaken up;
4. another sterile syringe is taken, 1mL of water sample is absorbed from the first bottle and injected into the second bottle, and the mixture is shaken up;
5. sequentially inoculating and diluting the mixture to the last bottle according to the operation;
6. carrying out parallel experiments according to the steps of 1-5;
7. and (3) inoculating and diluting the water sample added with the composite sterilization foaming agent in an amount of 1.0g/L according to the steps of 1-6.
8. And (3) putting the two groups of bacteria test bottles into a constant-temperature incubator at 35 ℃ for culture. After the sulfate reducing bacteria are cultured for 7 days, the liquid in the test bottle is changed from colorless transparency to black, namely the growth of the sulfate reducing bacteria is shown. After the saprophytic bacteria are cultured for 7 days, the liquid in the test bottle is changed from red to yellow or turbid, namely the saprophytic bacteria grow. After the iron bacteria were cultured for 7 days, the liquid in the test bottle was observed to produce a turbid or reddish brown precipitate, indicating the growth of iron bacteria.
And (3) recording data: recording with a plus and a minus from left to right, recording the corresponding position of a test bottle with bacteria growth as a positive bottle as a plus, recording the corresponding position of a test bottle without bacteria production as a negative bottle as a minus, such as a plus minus, and recording two groups of parallel experiments by a secondary repetition method as an up-and-down arrangement, such as a plus minus plus minus; when viewed from left to right, the dilution grade of a negative bottle begins to select three levels of dilution grades from left, each dilution grade is counted by the number of positive bottles to obtain an index (when the number of positive bottles meets 000, the positive bottles need to be sequentially counted from right to one level, and when the number of positive bottles does not meet three dilution grades, the positive bottles need to be sequentially counted from right to three levels), and the index is multiplied by the dilution multiple 10 of the water samplen(n is the number of times of dilution before the index position), looking up a bacteria count table (table 1), and substituting the bacteria count obtained by the index into the water sample to obtain the bacteria content in the water sample. For example, "+ +++ -in the index in, and in the index of 220, n is in the index, n is 1, and in the number of the index, and the number of bacteria and the number of bacteria and the index, and the number of the sample, and the sample, and the sample1One per mL.
TABLE 1 bacterial counter by two-time repeat method
| Index of refraction | Number of bacteria/mL | Index of refraction | Number of bacteria/mL | Index of refraction | Number of bacteria/mL |
| 000 | 0.0 | 110 | 1.3 | 211 | 12.0 |
| 001 | 0.5 | 111 | 2.0 | 212 | 20.0 |
| 010 | 0.5 | 120 | 2.0 | 220 | 25.0 |
| 011 | 0.9 | 121 | 3.0 | 221 | 70.0 |
| 020 | 0.9 | 200 | 2.5 | 222 | 110.0 |
| 100 | 0.6 | 201 | 2.0 | ||
| 101 | 1.2 | 210 | 6.0 |
The foregoing are merely exemplary embodiments of the present invention, which enable those skilled in the art to understand or practice the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (16)
1. The composite sterilization foaming agent for the shale gas foam well comprises the following components in parts by mass: 25-35 parts of betaine zwitterionic surfactant, 0-10 parts of fatty alcohol polyoxyethylene sulfate, 1-10 parts of C1-C5 aldehyde compound, 0-10 parts of quaternary ammonium salt surfactant, 0.5-2 parts of polyvinyl alcohol, 1-4 parts of C2-C3 alcohol compound, 4-8 parts of quinoline salt, 1-3 parts of hexamethylene tetramine and 50-60 parts of water.
2. The composite bactericidal foaming agent of claim 1, wherein the betaine zwitterionic surfactant is selected from the group consisting of betaines of the first class in combination with C14-C18 alkyl propyl betaines.
3. The composite bactericidal foaming agent of claim 2, wherein the first type of betaine is selected from one or a combination of two or more of cocamidopropyl betaine, cocamidopropyl dimethyl betaine, and dodecyl dimethyl betaine.
4. The composite bactericidal foaming agent according to any one of claims 1 to 3, wherein the fatty alcohol polyoxyethylene sulfate is a product obtained by reacting fatty alcohol polyoxyethylene ether with sulfamic acid.
5. The composite bactericidal foaming agent of claim 4, wherein the product is selected from one or a combination of two of fatty alcohol polyoxyethylene sulfate sodium salt and fatty alcohol polyoxyethylene sulfate ammonium salt.
6. The composite sterilization foaming agent of claim 4 or 5, wherein the fatty alcohol polyoxyethylether has a fatty carbon chain number of 7-9 and an ethoxy number of 5.
7. The composite bactericidal foaming agent of any one of claims 1 to 6, wherein the C1-C5 aldehyde compound is selected from one or a combination of more than two of formaldehyde, acetaldehyde, propionaldehyde, butyraldehyde and glutaraldehyde.
8. The composite bactericidal foaming agent of any one of claims 1 to 7, wherein the quaternary ammonium surfactant is selected from alkyl trimethyl ammonium chlorides or bromides of C12-C16.
9. The composite bactericidal foaming agent of any one of claims 1-8, wherein the polyvinyl alcohol comprises one or a combination of two of polyvinyl alcohol with an alcoholysis degree of 78% and polyvinyl alcohol with an alcoholysis degree of 88%.
10. The composite sterilization foaming agent as claimed in any one of claims 1 to 9, wherein the degree of polymerization of the polyvinyl alcohol is 100-700.
11. The composite bactericidal foaming agent of any one of claims 1 to 10, wherein the C2-C3 alcohol compound is selected from one or a combination of two of ethylene glycol and glycerol.
12. The composite sterilization foaming agent according to any one of claims 1 to 11, wherein the quinoline salt is an N-benzyl quinoline salt aqueous solution with the mass content of 50-85% prepared by taking quinoline and benzyl chloride as raw materials for reaction.
13. The composite bactericidal foaming agent of any one of claims 1 to 12, wherein the water is deionized or distilled water.
14. The preparation method of the composite sterilization foaming agent of any one of claims 1 to 13, which comprises the following steps:
(1) heating water to 50-70 ℃, and adding polyvinyl alcohol while stirring;
(2) after the polyvinyl alcohol is completely dissolved, sequentially adding a betaine zwitterionic surfactant, fatty alcohol polyoxyethylene sulfate, a C1-C5 aldehyde compound, a quaternary ammonium salt surfactant, a C2-C3 alcohol compound, quinoline salt and hexamethylenetetramine, and uniformly stirring and dissolving to obtain the composite sterilizing foaming agent.
15. Use of the composite bactericidal foaming agent as claimed in any one of claims 1 to 13 in drainage and gas production of shale foam wells.
16. The use of claim 15, wherein the composite bactericidal foaming agent is used in a concentration of 1000ppm to 2500ppm, calculated as water yield.
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| CN202110023868.3A CN114752367A (en) | 2021-01-08 | 2021-01-08 | Composite sterilization foaming agent for shale gas foam well, preparation method and application |
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| CN202110023868.3A CN114752367A (en) | 2021-01-08 | 2021-01-08 | Composite sterilization foaming agent for shale gas foam well, preparation method and application |
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| CN103980873A (en) * | 2014-06-04 | 2014-08-13 | 中国地质大学（北京） | Three-phase foam complex oil flooding system and application thereof |
| CN104449632A (en) * | 2014-11-28 | 2015-03-25 | 中国石油天然气股份有限公司 | Oil-resistant foaming agent and preparation method thereof |
| CN106221687A (en) * | 2016-07-21 | 2016-12-14 | 中国石油天然气股份有限公司长庆油田分公司 | A kind of gas field foam drainage rod and preparation method thereof |
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2021
- 2021-01-08 CN CN202110023868.3A patent/CN114752367A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103980873A (en) * | 2014-06-04 | 2014-08-13 | 中国地质大学（北京） | Three-phase foam complex oil flooding system and application thereof |
| CN104449632A (en) * | 2014-11-28 | 2015-03-25 | 中国石油天然气股份有限公司 | Oil-resistant foaming agent and preparation method thereof |
| CN106221687A (en) * | 2016-07-21 | 2016-12-14 | 中国石油天然气股份有限公司长庆油田分公司 | A kind of gas field foam drainage rod and preparation method thereof |
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