Biological surfactant defoamer compositions and their use

Abstract

The application relates to a biosurfactant defoaming agent composition and application thereof. The defoaming agent composition comprises a biosurfactant and a functional auxiliary agent, wherein the functional auxiliary agent comprises a defoaming auxiliary agent, and the defoaming auxiliary agent comprises one or more of a polyether surfactant and an organic silicon surfactant. The defoaming agent composition has good defoaming and foam suppressing capacity.

Description

Technical Field

[0001] This application relates to the field of defoamer technology, and in particular to a biosurfactant defoamer composition and its application. Background Technology

[0002] Foam is a common phenomenon in daily life and industrial production. It can be used in washing, flotation, dust removal, fire extinguishing, and the manufacture of foamed plastics and foamed ceramics. Sometimes, to obtain a large amount of bubbles and foam, foaming agents are added. However, in processes such as fermentation, papermaking, coatings, printing and dyeing, boiler water, wastewater treatment, and oilfield cementing, the presence of foam can affect production and product quality, and must be eliminated. To suppress and eliminate bubbles and foam, defoamers are usually added. For example, oilfield cement slurry requires various additives to ensure its suitable properties. Most of these additives are surface-active chemicals, so the cement slurry will produce a certain amount of foam. This foam will affect the cement slurry's mixing ability, density, and other properties. Defoamers can effectively eliminate or suppress the generation of bubbles and have wide applications in cement slurry. Furthermore, in drilling, well completion, and pipeline transportation operations, liquid foaming is also common. To quickly eliminate foam and maintain the stability of the liquid, defoamers must be used for maintenance treatment.

[0003] Traditional defoamers are numerous, including alcohols, oils, phosphate esters, amides, silicones, polyethers, and more. Another method provides a class of biosurfactants, such as lipopeptides. These are amphoteric substances composed of hydrophilic cyclic oligopeptides and hydrophobic fatty acid chains linked by lactone bonds. They are mainly produced by microorganisms such as Bacillus and Streptomyces, and possess antibacterial and antiviral biological activities. Studies have found that lipopeptide solutions can reduce the surface tension of water from 72 mN / m to 27.2 mN / m, with a critical micelle concentration of only 10. -5 M, and the required concentration is much lower than that of traditional defoamers, showing great defoaming potential. At the same time, lipopeptide biosurfactants are suitable for systems with pH 6 to 14, and also have the advantages of temperature resistance of -40℃ to 121℃, salt resistance of 150,000 mg / L, good water solubility, wetting and dispersibility, biodegradability, and no irritation to skin and eyes. They can be applied in many fields such as oil fields, agriculture, cleaning, cosmetics, and medicine.

[0004] Based on this, a method has been developed to provide an antifoaming composition for well fluids and its preparation method, using lipopeptide fermentation broth as an antifoaming agent. Verification has shown that the defoaming rate in well fluid systems can reach over 90%, and especially when the addition amount exceeds approximately 0.3%, the defoaming rate can reach 100%. However, in actual oilfield conditions, the complexity of the working conditions at oilfield well construction sites—including groundwater, rock formations, mixing equipment, defoaming reaction systems, high temperatures, and high pressures—is far more severe than laboratory simulations. Therefore, the defoaming and foam-suppressing capabilities of this composition need further improvement. Summary of the Invention

[0005] This application provides an antifoaming composition containing a biosurfactant and its application therein, the antifoaming composition having good defoaming and foam-suppressing abilities.

[0006] A first aspect of this application provides an antifoaming composition comprising a biosurfactant and a functional additive, wherein the functional additive includes an antifoaming agent, and the antifoaming agent comprises one or more of a polyether surfactant and an organosilicon surfactant.

[0007] In one embodiment, the mass ratio of the biosurfactant to the functional additive is (1%~99%):(99%~1%).

[0008] In one embodiment, the mass ratio of the biosurfactant to the functional additive is (1%~20%):(99%~80%).

[0009] In one embodiment, the polyether surfactant includes one or more of polyol-type polyether surfactants, fatty acid ester-type polyether surfactants, and amine ether-type polyether surfactants.

[0010] In one embodiment, the biosurfactant includes one or more of lipopeptides, glycolipids, phospholipids, and fatty acid esters.

[0011] In one embodiment, the defoaming agent includes polyether surfactants and silicone surfactants.

[0012] In one embodiment, the mass ratio of the polyether surfactant to the organosilicon surfactant is 1:(1~10).

[0013] In one embodiment, the functional additive further includes a stabilizing agent, which includes one or more of a dispersant, a thickener, and a solvent.

[0014] In one embodiment, the stabilizing agent has one or more of the following characteristics:

[0015] (1) The dispersant includes one or more of polyethylene glycol, polyvinyl alcohol, polyethyleneimine, polymaleic alcohol, polyacrylamide, polyacrylate and polyvinylpyrrolidone;

[0016] (2) The thickener includes one or more of guar gum, xanthan gum and sodium alginate;

[0017] (3) The solvent includes one or more of water, ethanol, and solvent oil;

[0018] (4) The mass ratio of the stabilizing agent to the biosurfactant is (1~15):1.

[0019] A second aspect of this application provides the application of the defoamer composition described in the first aspect in fermentation, papermaking, coatings, printing and dyeing, boiler water, wastewater treatment, building construction, or oilfield construction.

[0020] To address the problem of unsatisfactory defoaming, especially foam suppression, ability of biosurfactants in complex working conditions such as oil fields, this application has found through research that combining biosurfactants with specific defoaming aids can synergistically enhance the defoaming and foam suppression capabilities of the composition, making it suitable for complex working conditions and at a lower cost. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the defoaming test process in one embodiment;

[0022] Figure 2 This is a schematic diagram of the foam suppression test process in one embodiment;

[0023] Figure 3 This is a schematic diagram of the cement slurry density test process according to one embodiment. Detailed Implementation

[0024] The following detailed description, in conjunction with specific embodiments, illustrates the biosurfactant defoamer composition and its application of this application. This application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this application.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0026] In this article, "one or more" refers to any one, two or more of the listed items.

[0027] In this application, terms such as "first aspect" and "second aspect" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or quantity, nor should they be construed as implicitly indicating the importance or quantity of the indicated technical features. Moreover, terms such as "first" and "second" serve only as a non-exhaustive enumeration and should be understood not to constitute a closed limitation on quantity.

[0028] In this application, the technical features described in an open-ended manner include both closed technical solutions consisting of the listed features and open technical solutions that include the listed features.

[0029] In this application, numerical ranges are referred to as continuous unless otherwise specified, and include the minimum and maximum values ​​of the range, as well as every value between the minimum and maximum values. Furthermore, when the range refers to integers, it includes every integer between the minimum and maximum values ​​of the range. Additionally, when multiple ranges are provided to describe a feature or characteristic, the ranges may be merged. In other words, unless otherwise specified, all ranges disclosed herein should be understood to include any and all subranges to which they are incorporated.

[0030] Unless otherwise specified, the percentage content mentioned in this application refers to mass percentage for solid-liquid mixtures and solid-phase-solid mixtures, and volume percentage for liquid-phase-liquid mixtures.

[0031] Unless otherwise specified, all percentage concentrations mentioned in this application refer to the final concentration. The final concentration refers to the proportion of the added component in the system after the addition of that component.

[0032] Unless otherwise specified, the temperature parameters in this application may be either constant temperature processing or processing within a certain temperature range. The constant temperature processing allows for temperature fluctuations within the precision range controlled by the instrument.

[0033] In this application, room temperature generally refers to 4℃~30℃, and preferably 20±5℃.

[0034] Some examples of this application provide an antifoaming composition comprising a biosurfactant and a functional additive, the functional additive including an antifoaming agent, the antifoaming agent comprising one or more of polyether surfactants and silicone surfactants.

[0035] In some examples, the mass ratio of the biosurfactant to the functional additive is (1%~99%):(99%~1%). Specifically, the mass ratio of the biosurfactant to the functional additive includes, but is not limited to: 1%:99%, 5%:95%, 10%:90%, 15%:85%, 20%:80%, 25%:75%, 30%:70%, 50%:50%, 70%:30%, 99%:1%, or any range between the foregoing. Further, the mass ratio of the biosurfactant to the functional additive is (1%~20%):(99%~80%). Excessive biosurfactant may cause foaming in the system; properly controlling the ratio of the two can further reduce the occurrence of foam.

[0036] Without limitation, examples of the organosilicon surfactant include dimethyl silicone oil.

[0037] In some examples, the polyether surfactant includes one or more of polyol-type polyether surfactants, fatty acid ester-type polyether surfactants, and amine ether-type polyether surfactants. Without limitation, examples include one or more of polyoxypropylene vinyl glycerol ether, fatty alcohol polyoxyethylene ether, and glycerol polyoxypropylene ether.

[0038] In some of these examples, the biosurfactants include one or more of lipopeptides, glycolipids, phospholipids, and fatty acid esters.

[0039] In some examples, the defoaming aids include polyether surfactants and silicone surfactants. Combining polyether surfactants and silicone surfactants as defoaming aids in a ternary arrangement with biosurfactants can achieve better defoaming and foam-suppressing effects.

[0040] In some examples, the mass ratio of the polyether surfactant to the silicone surfactant is 1:(1~10). Specifically, the mass ratio of the polyether surfactant to the silicone surfactant includes, but is not limited to: 1:1, 1:2, 1:3, 1:4, 1:5, 1:6, 1:7, 1:8, 1:9, 1:10 or any range between the two.

[0041] In some examples, the functional additives also include stabilizing agents, which include one or more of dispersants, thickeners, and solvents. Further addition of suitable stabilizing agents to the composition can improve the stability between components, making the system less prone to phenomena such as stratification.

[0042] In some of these examples, the dispersant includes one or more of polyethylene glycol, polyvinyl alcohol, polyethyleneimine, polymaleic alcohol, polyacrylamide, polyacrylate, and polyvinylpyrrolidone.

[0043] In some of these examples, the thickener includes one or more of guar gum, xanthan gum, and sodium alginate.

[0044] In some of these examples, the solvent includes one or more of water, ethanol, and solvent oil.

[0045] In some examples, the mass ratio of the stabilizing agent to the biosurfactant is (1~15):1. Specifically, the mass ratio of the stabilizing agent to the biosurfactant includes, but is not limited to: 1:1, 1:2, 1:3, 1:4, 1:5, 1:6, 1:7, 1:8, 1:9, 1:10, 1:11, 1:12, 1:13, 1:14, 1:15, or any range between the foregoing.

[0046] Other examples of this application also provide the application of the defoamer compositions described above in fermentation, papermaking, coatings, printing and dyeing, boiler water, wastewater treatment, building construction, or oilfield construction (e.g., oilfield cementing).

[0047] For experimental parameters not specified in the following specific embodiments, please refer to the guidelines given in this application document first, or refer to experimental manuals or other experimental methods known in the art, or refer to the experimental conditions recommended by the manufacturer.

[0048] The raw materials and reagents involved in the following specific embodiments can be obtained commercially or prepared by those skilled in the art using known methods.

[0049] The preparation method of the biosurfactant involved in the examples is as follows. Without limitation, it can also be prepared by existing methods in the art.

[0050] 1. Fermentation preparation method of lipopeptides

[0051] Fermentation strain: Bacillus subtilis.

[0052] Streak plate medium: yeast extract 5 g / L, peptone 10 g / L, sodium chloride 10 g / L, agar powder 20 g / L.

[0053] Seed culture medium: yeast extract 5 g / L, peptone 10 g / L, sodium chloride 10 g / L.

[0054] Shake-flask fermentation medium: rapeseed oil 50g / L, glucose 50g / L, NaNO3 5g / L, magnesium sulfate heptahydrate 1g / L, yeast extract 1g / L, potassium chloride 1g / L, potassium dihydrogen phosphate 1g / L, disodium hydrogen phosphate dodecahydrate 1g / L, calcium chloride 0.1g / L, ferrous sulfate heptahydrate 0.01g / L.

[0055] Cultivation methods:

[0056] (1) Streak the culture medium on a plate and incubate at 37°C for 24 hours to obtain a single colony;

[0057] (2) Pick a single colony and inoculate it into a 50mL seed shake flask, with a liquid volume of 20mL. Incubate at 37℃ and 200rpm on a shaker for 20h as a fermentation seed;

[0058] (3) Inoculate the fermentation seed liquid into a 500mL fermentation shake flask at a 5% inoculation rate, with a total liquid volume of 50mL. Incubate at 37℃ and 220rpm on a shaker for 50h. After fermentation, harvest the fermentation liquid and test the lipopeptide fermentation yield (30g / L).

[0059] 2. Fermentation preparation method of rhamnolipid

[0060] Fermentation strain: Natural Pseudomonas aeruginosa.

[0061] Streak plate medium: yeast extract 5 g / L, peptone 10 g / L, sodium chloride 10 g / L, agar powder 20 g / L.

[0062] Seed culture medium: yeast extract 5 g / L, peptone 10 g / L, sodium chloride 10 g / L.

[0063] Shake-flask fermentation medium: rapeseed oil 50g / L, glucose 30g / L, NaNO3 5g / L, magnesium sulfate heptahydrate 1g / L, yeast extract 1g / L, potassium chloride 1g / L, potassium dihydrogen phosphate 3g / L, disodium hydrogen phosphate dodecahydrate 5g / L, calcium chloride 0.3g / L, ferrous sulfate heptahydrate 0.01g / L.

[0064] Cultivation methods:

[0065] (1) Streak the culture medium on a plate and incubate at 37°C for 24 hours to obtain a single colony;

[0066] (2) Pick a single colony and inoculate it into a 50mL seed shake flask, with a liquid volume of 20mL. Incubate at 37℃ and 200rpm on a shaker for 20h as a fermentation seed;

[0067] (3) Inoculate the seed liquid into a 500mL fermentation shake flask at a 5% inoculation rate, with a total liquid volume of 50mL. Incubate at 37℃ and 200rpm on a shaker for 105h. After fermentation, harvest the fermentation broth and test the rhamnolipid yield. The shake flask fermentation yield was 32g / L.

[0068] 3. Fermentation preparation method of sophorolipids

[0069] Fermentation strain: Candida albicans.

[0070] Streak plate medium: glucose 30g / L, yeast extract 5g / L, peptone 10g / L, agar powder 20g / L.

[0071] Seed culture medium: glucose 30g / L, yeast extract 5g / L, peptone 10g / L.

[0072] Shake-flask fermentation medium: rapeseed oil 50g / L, glucose 50g / L, yeast extract 5g / L, magnesium sulfate heptahydrate 1g / L, potassium dihydrogen phosphate 3g / L, disodium hydrogen phosphate dodecahydrate 3g / L, calcium chloride 0.3g / L, ferrous sulfate heptahydrate 0.01g / L.

[0073] Cultivation methods:

[0074] (1) Streak the culture medium on a plate and incubate it at 30°C for 24 hours to obtain a single colony;

[0075] (2) Pick a single colony and inoculate it into a 50mL seed shake flask, with a liquid volume of 20mL. Incubate at 30℃ and 200rpm on a shaker for 16h as fermentation seed;

[0076] (3) Inoculate the seed liquid into a 500mL fermentation shake flask at a 5% inoculation rate, with a total liquid volume of 50mL. Incubate at 30℃ and 180rpm for 7 days. After fermentation, harvest the fermentation liquid and test the yield of sophora japonica glycolipids, which is 46g / L.

[0077] Examples and Comparative Examples

[0078] The defoamer compositions provided in this embodiment and the comparative example are summarized in Table 1 below according to their mass percentages.

[0079] Table 1

[0080]

[0081] The preparation method of the above defoamer composition is as follows:

[0082] Mix water and biosurfactant, and then mechanically stir at 400 rpm until homogeneous. Then add the remaining components (understandably, for some less soluble components, such as polymers, they can be partially dispersed in water or dissolved into a mother liquor before being added) and continue mechanically stirring at 400 rpm. Finally, use a homogenizer to shear mix at 2500 rpm for 5 minutes to ensure that the materials are mixed evenly.

[0083] Test example:

[0084] This application, through accumulating and summarizing experience from oilfield construction sites, has improved the experimental evaluation model. For multiple dimensions, including defoaming, foam suppression, and defoaming evaluation in cement construction, more stringent experimental evaluation conditions have been introduced to reflect real-world defoaming conditions in oilfields as much as possible. Defoaming experiments, foam suppression experiments, and cement density method experiments are conducted within 2 hours of the composition preparation for evaluation. The methods for testing and evaluating the defoaming performance, foam suppression performance, and cement slurry density of the defoaming composition are as follows:

[0085] 1.1 Experimental Materials and Equipment

[0086] 1.1.1 Experimental Materials

[0087] Tap water, oil-based flushing agent WH-5 (from Beijing Aokaili Oilfield Chemicals, 20 kg), cement, iron ore powder, and water loss reducer.

[0088] Substances to be tested: oil-free culture medium, lipopeptide fermentation broth, pure lipopeptide, organosilicon, polyether

[0089] 1.1.2 Experimental Equipment

[0090] 5ml pipettes, 1ml pipettes, Qingdao Haitongda Special Instruments Co., Ltd. HTD3070 constant speed stirrer, 2000ml plastic graduated cylinder, timer, balance (accurate to 0.01 g), atmospheric pressure liquid density meter, pressurized liquid density meter

[0091] 1.2 Experiment Content

[0092] 1.2.1 Preparation of various substances used in the experiment: All substances to be tested were accurately prepared into a stock solution of 10 g / L.

[0093] 1.2.2.1 Defoaming Test Procedure

[0094] Remove the stirring cup of the constant speed stirrer from its base and place it on a balance. Weigh 24 g (accurate to 0.01 g) of oil-based cleaning agent into the stirring cup. Place the stirring cup containing the oil-based cleaning agent back onto the base of the constant speed stirrer. Place a beaker on the balance and weigh 300 g (accurate to 0.01 g) of tap water into it. Pour the accurately weighed tap water into the stirring cup of the constant speed stirrer and cover it with the lid. Weigh 0.6 g of the test substance using the balance and record the volume V0 of 0.6 g of the test substance. Turn on the power switch of the constant speed stirrer, adjust the speed to 4000 r / min, set the stirring time to 15 s, and turn on the constant speed stirrer to start stirring. After stirring is complete, within 10 s, pour the solution and foam from the stirring cup of the constant speed stirrer into a graduated cylinder and measure and record the solution volume V1 (including the foam volume, e.g., V1). Figure 1(Right image). Using a pipette, pipette a volume V0 of the analyte. Within 15 seconds, slowly add the analyte to a graduated cylinder containing the stirred solution, circling the inner edge of the cylinder. Within 1 second of adding the analyte, start the timer and record the solution volume V2 at 10 seconds, V3 at 20 seconds, V4 at 30 seconds, and V5 at 1 minute (e.g., V2 at 10 seconds, V3 at 20 seconds, V4 at 30 seconds, V5 at 1 minute). Figure 1 (Middle left image, composition 14 sample).

[0095] 1.2.2.2 Calculation of defoaming rate of the analyte

[0096] Defoaming rate = (V1 - V5) / (V1 - 325) × 100%

[0097] 1.2.3.1 Foam Suppression Test Procedure

[0098] Blank control group: Measure 350 mL of tap water using a graduated cylinder and pour it into the mixing cup on the base of the constant speed stirrer. Weigh 5.6 g (accurate to 0.01 g) of foaming agent using a balance and pour the accurately weighed foaming agent into the mixing cup of the constant speed stirrer, then cover the mixing cup with the lid. Turn on the power switch of the constant speed stirrer, adjust the speed to 4000 r / min, set the stirring time to 50 s, and turn on the constant speed stirrer to start stirring. After stirring is complete, within 10 s, pour the solution and foam from the mixing cup of the constant speed stirrer into a graduated cylinder, measure and record the solution volume V1 (including the foam volume, e.g., ...). Figure 2 (Right image in the middle)

[0099] Experimental Group: Measure 350 mL of tap water using a graduated cylinder and pour it into the mixing cup on the base of the constant speed stirrer. Weigh 5.6 g (accurate to 0.01 g) of foaming agent using a balance and add the accurately weighed foaming agent to the mixing cup on the base of the constant speed stirrer containing tap water. Weigh 0.8 g (accurate to 0.001 g) of the test substance using a balance and add the accurately weighed test substance to the mixing cup on the base of the constant speed stirrer containing tap water and foaming agent. Cover the mixing cup of the constant speed stirrer. Turn on the power switch of the constant speed stirrer, adjust the speed to 4000 r / min, set the stirring time to 50 s, and turn on the constant speed stirrer to stir. After stirring is completed, within 10 s, pour the solution and foam from the mixing cup of the constant speed stirrer into a graduated cylinder, measure and record the solution volume V2 (including the foam volume, e.g., ...). Figure 2 (Middle left image, composition 14 sample).

[0100] 1.2.3.2 Calculation of foam suppression rate of the analyte

[0101] Defoaming rate = (V1 - V2) / (V1 - 350) × 100%

[0102] 1.2.4 Cement slurry density test experiment

[0103] 1.2.4.1 Preparation of Cement Grout

[0104] Place a clean beaker on a balance. Weigh 600 g (accurate to 0.01 g) of cement powder and 390 g (accurate to 0.01 g) of iron ore powder into the clean beaker. Use a glass rod to thoroughly mix the cement powder and iron ore powder in the beaker. Remove the stirring cup of the constant speed stirrer from its base. Place the removed stirring cup on the balance and weigh 300 g (accurate to 0.01 g) of tap water. After weighing, place the stirring cup containing tap water back onto the base of the constant speed stirrer. Weigh 39 g (accurate to 0.01 g) of water loss control agent and 1.73 g (accurate to 0.001 g) of the test substance on the balance. Add the accurately weighed water loss control agent and test substance to the stirring cup containing tap water. Turn on the power switch of the constant speed mixer, set the speed to 4000 r / min and 12000 r / min, and the mixing time to 50 s. First, control the speed of the constant speed mixer at 4000 r / min, turn on the switch, and slowly add the thoroughly mixed cement and iron ore powder into the mixing cup of the constant speed mixer within 15 s. After adding, close the lid of the mixing cup. After the constant speed mixer has been mixing for 15 s, adjust the speed of the constant speed mixer to 12000 r / min and continue mixing for the remaining 35 s. After mixing is complete, turn off the switch of the constant speed mixer, remove the mixing cup from the base of the constant speed mixer, and the cement slurry is ready.

[0105] 1.2.4.2 Determination of density of non-foamed cement slurry

[0106] Remove the pressurized liquid density meter and place it on a horizontal surface. Loosen the pressure cap, remove the cup lid, and pour the cement slurry prepared in 1.2.4.1 into the drilling fluid cup. Place the cup lid on the drilling fluid cup filled with cement slurry, ensuring the one-way valve on the cup lid is in the lower position. Push the cup lid downwards into the cup opening until the outer edge of the cup lid contacts the upper edge of the cup. Excess cement slurry will be discharged through the one-way valve. After placing the cup lid, pull the one-way valve upwards to close it. Rinse the cup and threads with clean water, then tighten the pressure cap. Remove the pressurized suction tube and immerse the end of the suction tube into the cement slurry. Pull the suction rod upwards to fill the tube with cement slurry. Move the filled suction tube to the waste area and drain the cement slurry. The first suction of cement slurry is to wet the inner tube of the suction tube. Immerse the end of the suction tube into the cement slurry again and pull the suction rod upwards to fill the tube with cement slurry. Place the suction tube nozzle onto the "O" ring of the one-way valve on the cup lid, and push the suction rod downwards while ensuring the one-way valve is pointing downwards to pump the cement slurry into the cup. During pumping, remove the suction tube once to release air, then continue pumping until it can no longer be pumped, then slowly remove the suction tube. Wipe the instrument exterior and cup lid clean of excess cement slurry. Align the main blade of the instrument with the main blade edge and place it on the support base. Move the weight near the main blade edge, then slowly move the weight to the right, keeping the lever scale horizontal and balanced. The graduation line corresponding to the left edge of the weight indicates the density ρ1 of the undisturbed cement slurry being measured (e.g., ...). Figure 3 (Right image in the middle)

[0107] 1.2.4.3 Determination of the density of cement slurry after defoaming

[0108] Remove the atmospheric pressure liquid density meter and place it on a horizontal plane. Remove the lid and pour the cement slurry prepared in 1.3.2.1 into the container until it is full. Place the lid over the container filled with cement slurry and rotate it to squeeze out excess cement slurry and air through the small hole in the center of the lid. Wipe the outer surface of the instrument and the lid clean of excess cement slurry. Align the main blade of the instrument with the blade edge and place it on the support. Move the weight near the blade edge, and then slowly move the weight to the right to keep the lever scale in a horizontal and balanced position. The line on the left side of the weight is the density ρ2 of the defoamed cement slurry (e.g., ...). Figure 3 (Middle left image, composition 14 sample).

[0109] 1.2.4.4 Calculation of the density difference of cement slurry after defoaming

[0110] Δρ=ρ1-ρ2

[0111] The test results are shown in Table 2 below:

[0112] Table 2. Test results of defoaming performance, foam suppression performance and cement slurry density of each defoaming composition.

[0113]

[0114] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0115] The embodiments described above are merely illustrative of several implementation methods of this application, intended to facilitate a detailed understanding of the technical solutions of this application, but should not be construed as limiting the scope of protection of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the scope of protection of this application. It should be understood that technical solutions obtained by those skilled in the art based on the technical solutions provided in this application through logical analysis, reasoning, or limited experimentation are all within the scope of protection of the appended claims. Therefore, the scope of protection of this patent application should be determined by the content of the appended claims, and the specification can be used to interpret the content of the claims.

Claims

1. A biosurfactant defoamer composition for use in building construction or oilfield construction, characterized in that, It includes biosurfactants and functional additives, wherein the functional additives include defoaming agents, and the defoaming agents include one or more of polyether surfactants and organosilicon surfactants; the biosurfactants include one or more of lipopeptides, rhamnolipids and sophorolipids; and the mass ratio of the biosurfactants and functional additives is (4%~10%):(90%~96%).

2. The biosurfactant defoamer composition according to claim 1, characterized in that, The polyether surfactant includes one or more of polyol-type polyether surfactants, fatty acid ester-type polyether surfactants, and amine ether-type polyether surfactants.

3. The biosurfactant defoamer composition according to claim 1, characterized in that, The biosurfactants include lipopeptides.

4. The biosurfactant defoamer composition according to any one of claims 1 to 3, characterized in that, The defoaming aids include polyether surfactants and silicone surfactants.

5. The biosurfactant defoamer composition according to claim 4, characterized in that, The mass ratio of the polyether surfactant to the organosilicon surfactant is 1:(1~10).

6. The biosurfactant defoamer composition according to any one of claims 1 to 3, characterized in that, The functional additives also include stabilizing agents, which include one or more of dispersants, thickeners, and solvents.

7. The biosurfactant defoamer composition according to claim 6, characterized in that, The stabilizing agent has one or more of the following characteristics: (1) The dispersant includes one or more of polyethylene glycol, polyvinyl alcohol, polyethyleneimine, polymaleic alcohol, polyacrylamide, polyacrylate and polyvinylpyrrolidone; (2) The thickener includes one or more of guar gum, xanthan gum and sodium alginate; (3) The solvent includes one or more of water, ethanol, and solvent oil; (4) The mass ratio of the stabilizing agent to the biosurfactant is (1~15):

1.

8. The application of the biosurfactant defoamer composition according to any one of claims 1 to 7 in building construction or oilfield construction.

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