CN110483686B - Environment-friendly cationic fluid loss reducing composition and fluid loss reducing agent - Google Patents
Environment-friendly cationic fluid loss reducing composition and fluid loss reducing agent Download PDFInfo
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- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
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Abstract
The invention provides an environment-friendly cationic fluid loss reducing composition and a fluid loss reducing agent. The composition comprises the following components in parts by weight: 9-12 parts of alkenyl amide, 3-4 parts of phenol compounds, 1.0-1.5 parts of alkenyl sulfonate, 0.5-1.5 parts of waste acrylic fiber hydrolyzed ammonium salt and 1.2-3.5 parts of chain transfer agent. The alkenyl amide is a basic monomer which forms a main chain structure of the fluid loss additive and plays a role of a skeleton; the phenol compound protects clay particles in a high-salt and high-calcium environment, and improves the salt invasion and calcium invasion resistance of the phenol compound; sulfonate is used to introduce sulfonic group with strongest hydrophilic performance into the side chain of the fluid loss additive, so that the fluid loss additive still has strong hydration capability and salt resistance at high temperature. The temperature resistance and the salt resistance of the filtrate reducer are enhanced by the hydrolyzed ammonium salt of the waste acrylic fibers. The waste acrylic fibers in the hydrolyzed ammonium salt of the waste acrylic fibers are waste materials, so the cost is low, and the cost of the filtrate reducer can be reduced.
Description
Technical Field
The invention relates to the technical field of drilling fluid materials, and particularly relates to an environment-friendly cationic fluid loss reducing composition and a fluid loss additive.
Background
The fluid loss of the drilling fluid means that at a certain temperature, when the drilling fluid pressure in a shaft is larger than the pore pressure of a stratum, the free phase in the drilling fluid is diffused into the stratum. The free phase entering the stratum brings a series of problems, especially the stratum with high shale content is easy to cause the collapse of the well wall, and also causes the pollution of the reservoir stratum, when some surface active agents in the drilling fluid enter the stratum, the wetting reversal of the stratum is caused, and great difficulty is brought to the exploitation of crude oil, so the control of the filtration loss of the drilling fluid is particularly important. The control of drilling fluid loss in conventional drilling is currently achieved primarily by the addition of fluid loss additives.
Due to the rapid increase of energy demand, particularly the consumption of petroleum and natural gas, the drilling depth of oil and gas wells is continuously increased, and the number of deep wells and ultra-deep wells is increased. Geological conditions become more complex during the drilling process, and the high-temperature, high-pressure and high-salt stratum environment makes the control of the water loss, rheological properties and the like of the drilling fluid difficult. The requirements on the drilling fluid in the drilling process are more and more strict, the performance of the drilling fluid directly influences whether safe, rapid and economical drilling can be carried out, and a good drilling fluid system has good fluid loss reduction performance and film forming performance.
The filtrate reducer is an important agent of a drilling fluid treating agent and is mainly divided into celluloses, humic acids, acrylic acids, starches, resins and the like according to the source of the filtrate reducer. In the market, most of the salt-resistant fluid loss additives are mainly organic polymers, and some inorganic compounds, auxiliary polymers and the like are added. Although some high-temperature resistant fluid loss additive varieties exist at present, the problems of high cost and complex preparation exist.
Disclosure of Invention
The invention mainly aims to provide an environment-friendly cationic fluid loss additive and a fluid loss additive, and aims to solve the problem of high cost of a high-temperature-resistant fluid loss additive in the prior art.
In order to achieve the above objects, according to one aspect of the present invention, there is provided an environment-friendly cationic fluid loss composition comprising, in parts by weight: 9-12 parts of alkenyl amide, 3-4 parts of phenol compounds, 1.0-1.5 parts of alkenyl sulfonate, 0.5-1.5 parts of waste acrylic fiber hydrolyzed ammonium salt and 1.2-3.5 parts of chain transfer agent.
Furthermore, in the composition, the weight part of the alkenyl amide is 9.5-10.5, and the weight part of the waste acrylic fiber hydrolyzed ammonium salt is 0.7-1.2.
Further, the alkenyl amide is selected from one or more of acrylamide, N-dimethylacrylamide, N-diethylacrylamide, N-vinylacetamide, N-vinylmethylacetamide, N-vinylethylacetamide and N, N-methylenebisacrylamide.
Further, the above phenol compounds have the general structural formula (I)
Wherein R is1、R2And R3Each independently selected from-H, -CONH2、-SO3K、-SO3Any one of Na, -COOH and-CN.
Further, the alkenyl sulfonate is any one selected from allyl sulfonate, styrene sulfonate, and 2-acrylamido alkylsulfonate.
Further, the viscosity of the waste acrylic fiber hydrolyzed ammonium salt measured at 95 ℃ is 15-19/m Pa.s.
The composition further comprises an initiator, wherein the initiator is preferably 0.04-0.1 part by weight, and the initiator is preferably ammonium persulfate or potassium persulfate.
Further, the chain transfer agent is selected from any one or more of tert-dodecyl mercaptan, n-dodecyl mercaptan, isopropanol, isobutanol, mercaptoethanol, thioglycolic acid, pentene and isooctyl 3-mercaptopropionate.
According to another aspect of the present invention, there is provided an environmentally friendly cationic fluid loss additive prepared using a fluid loss composition, the fluid loss composition being any one of the compositions described above.
Further, the preparation method of the fluid loss additive comprises the following steps: dissolving alkenyl amide, phenol compounds, alkenyl sulfonate and acrylic fiber hydrolyzed ammonium salt in water to form a mixed system; adjusting the pH value of the mixed system to be 5-6.5 to form a buffer system; and heating the buffer system to 50-90 ℃, and adding an initiator and a chain transfer agent under stirring to react to obtain the filtrate reducer.
By applying the technical scheme of the invention, the alkenyl amide is a basic monomer which forms a main chain structure of the fluid loss additive and plays a skeleton role; the phenol compound increases a benzene ring structure on a main chain, weakens the high-temperature desorption effect of molecules caused by high-temperature movement by utilizing the rigidity of the benzene ring structure, and the benzene ring structure can effectively block the invasion of metal cations, thereby protecting clay particles in a high-salt and high-calcium environment and improving the salt invasion and calcium invasion resistance of the clay particles; sulfonate is used to introduce sulfonic group with strongest hydrophilic performance into the side chain of the fluid loss additive, so that the fluid loss additive still has strong hydration capability and salt resistance at high temperature. The carbon chain of the waste acrylic fiber hydrolyzed ammonium salt can be polymerized with other components and can be used as a cationic monomer, so that the adsorptive group of the filtrate reducer is changed from anionic enamine group to cationic quaternary amine group, and further more stable electrostatic adsorption is formed. Therefore, the filtrate reducer prepared by the mixture formed by the components has high temperature resistance and salt resistance, and meanwhile, the waste acrylic fibers in the waste acrylic fiber hydrolyzed ammonium salt are waste materials which can be sourced from waste clothes, textile leftover materials and the like, so that the cost is low, and the cost of the filtrate reducer can be reduced. Further, the addition of the chain transfer agent controls the chain length of the fluid loss additive formed by polymerization, and further controls the viscosity and film forming properties of the fluid loss additive.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail with reference to examples.
As analyzed by the background of the present application, the cost of the high temperature resistant filtrate reducer of the prior art is too high, and in order to solve the problem, the present application provides an environment-friendly cationic filtrate reducer composition and a filtrate reducer.
In one exemplary embodiment herein, there is provided an environmentally friendly cationic fluid loss composition comprising, in parts by weight: 9-12 parts of alkenyl amide, 3-4 parts of phenol compound, 1.0-1.5 parts of alkenyl sulfonate, 0.5-1.5 parts of acrylic fiber hydrolyzed ammonium salt and 1.2-3.5 parts of chain transfer agent.
In the composition, the alkenyl amide is a basic monomer which forms a main chain structure of the fluid loss additive and plays a role of a skeleton; the phenol compound increases a benzene ring structure on a main chain, weakens the high-temperature desorption effect of molecules caused by high-temperature movement by utilizing the rigidity of the benzene ring structure, and the benzene ring structure can effectively block the invasion of metal cations, thereby protecting clay particles in a high-salt and high-calcium environment and improving the salt invasion and calcium invasion resistance of the clay particles; sulfonate is used to introduce sulfonic group with strongest hydrophilic performance into the side chain of the fluid loss additive, so that the fluid loss additive still has strong hydration capability and salt resistance at high temperature. The carbon chain of the waste acrylic fiber hydrolyzed ammonium salt can be polymerized with other components and can be used as a cationic monomer, so that the adsorptive group of the filtrate reducer is changed from anionic enamine group to cationic quaternary amine group, and further more stable electrostatic adsorption is formed. Therefore, the filtrate reducer prepared by the mixture formed by the components has high temperature resistance and salt resistance, and meanwhile, the waste acrylic fibers in the waste acrylic fiber hydrolyzed ammonium salt are waste materials which can be sourced from waste clothes, textile leftover materials and the like, so that the cost is low, and the cost of the filtrate reducer can be reduced. Further, the addition of the chain transfer agent controls the chain length of the fluid loss additive formed by polymerization, and further controls the viscosity and film forming properties of the fluid loss additive.
In a preferred embodiment of the present application, in the composition, the parts by weight of the alkenyl amide is 9.5 to 10.5, and the parts by weight of the waste acrylic hydrolyzed ammonium salt is 0.7 to 1.2. On the premise that the main chain structure of the formed filtrate reducer is stable, the weight of the waste acrylic fiber hydrolyzed ammonium salt is properly increased, and the temperature resistance and salt resistance of the ammonium salt can be further exerted.
The alkenyl amide used in the present application may be various, and in order to further reduce the cost and the manufacturing difficulty, it is preferable that the alkenyl amide is selected from one or more of acrylamide, N-dimethylacrylamide, N-diethylacrylamide, N-vinylacetamide, N-vinylmethylacetamide, N-vinylethylacetamide, and N, N-methylenebisacrylamide.
The phenol compound of the present application is mainly used for providing a benzene ring, and in order to improve the polymerization activity thereof, it is preferable that the phenol compound has the general structural formula (I)
Wherein R is1、R2And R3Each independently selected from-H, -CONH2、-SO3K、-SO3Any one of Na, -COOH and-CN.
The alkenyl sulfonate used in the application can be selected from the existing alkenyl sulfonate materials in the prior art, and in order to bring convenience to the performance exertion of the hydrolyzed ammonium salt of the waste acrylic fibers, some alkenyl sulfonates with relatively simple structures are preferred, namely the alkenyl sulfonate is selected from any one of allyl sulfonate, styrene sulfonate and 2-acrylamide alkyl sulfonate. The alkyl group in the 2-acrylamidoalkylsulfonic acid salt may be selected from short chain alkyl groups, for example, alkyl groups having 3 to 8 carbon atoms. The alkenyl sulfonate may be selected from sodium salts and potassium salts.
The viscosity measured at 95 ℃ for the waste acrylic fiber hydrolyzed ammonium salt is 15-19/m Pa.s. By controlling the viscosity of the waste acrylic fiber hydrolyzed ammonium salt, the chain segment of the ammonium salt is shorter, so that the ammonium salt can be polymerized with other costs more easily to form the filtrate reducer with the relatively shorter chain segment.
In order to improve the polymerization efficiency, the composition preferably further comprises an initiator, the weight part of the initiator is preferably 0.04-0.1, and the initiator is preferably ammonium persulfate or potassium persulfate.
In addition, in order to improve the chain transfer efficiency, it is preferable that the chain transfer agent is selected from one or more of tert-dodecyl mercaptan, n-dodecyl mercaptan, isopropanol, isobutanol, mercaptoethanol, thioglycolic acid, pentene, and isooctyl 3-mercaptopropionate.
In another exemplary embodiment of the present application, an environmentally friendly cationic fluid loss additive is provided that is prepared using a fluid loss composition that is any of the above. Based on the performance of the composition, the fluid loss agent has high temperature resistance and salt resistance, and is low in cost.
The method for preparing the filtrate reducer by using the composition can be referred to the prior art or be formulated according to the substance reaction principle. In a preferred embodiment, the preparation method of the fluid loss additive comprises the following steps: dissolving alkenyl amide, phenol compounds, alkenyl sulfonate and acrylic fiber hydrolyzed ammonium salt in water to form a mixed system; adjusting the pH value of the mixed system to be 5-6.5 to form a buffer system; and heating the buffer system to 50-90 ℃, and adding an initiator and a chain transfer agent under stirring to react to obtain the filtrate reducer.
The advantageous effects of the present application will be further described below with reference to examples and comparative examples.
Example 1
Dissolving 100g of acrylamide, 35g of phenol, 10g of sodium allylsulfonate and 10g of acrylic fiber hydrolyzed ammonium salt with the viscosity of 17.6 in 200g of water to form a mixed system; adjusting the pH value of the mixed system to about 6 to form a buffer system; and (3) heating the buffer system to 80 ℃, and adding 0.8g of ammonium persulfate and 15g of chain transfer agent under the stirring condition for reaction to obtain the fluid loss agent.
Example 2
120g of acrylamide, 30g of phenol, 15g of sodium allylsulfonate and 15g of acrylic fiber hydrolyzed ammonium salt with the viscosity of 17.6 are dissolved in 200g of water to form a mixed system; adjusting the pH value of the mixed system to about 6 to form a buffer system; and (3) heating the buffer system to 80 ℃, and then adding 0.8g of ammonium persulfate and 35g of chain transfer agent under the stirring condition for reaction to obtain the fluid loss agent.
Example 3
90g of acrylamide, 40g of phenol, 12g of sodium allylsulfonate and 5g of acrylic fiber hydrolyzed ammonium salt with the viscosity of 17.6 are dissolved in 150g of water to form a mixed system; adjusting the pH value of the mixed system to about 6 to form a buffer system; and (3) heating the buffer system to 80 ℃, and then adding 0.8g of ammonium persulfate and 12g of chain transfer agent under the stirring condition for reaction to obtain the fluid loss agent.
Example 4
Dissolving 95g of acrylamide, 35g of phenol, 10g of sodium allylsulfonate and 12g of acrylic fiber hydrolyzed ammonium salt with the viscosity of 17.6 in 200g of water to form a mixed system; adjusting the pH value of the mixed system to about 6 to form a buffer system; and (3) heating the buffer system to 80 ℃, and adding 0.8g of ammonium persulfate and 15g of chain transfer agent under the stirring condition for reaction to obtain the fluid loss agent.
Example 5
105g of acrylamide, 35g of phenol, 10g of sodium allylsulfonate and 7g of acrylon hydrolyzed ammonium salt with the viscosity of 17.6 are dissolved in 200g of water to form a mixed system; adjusting the pH value of the mixed system to about 6 to form a buffer system; and (3) heating the buffer system to 80 ℃, and adding 0.8g of ammonium persulfate and 15g of chain transfer agent under the stirring condition for reaction to obtain the fluid loss agent.
Example 6
Dissolving 95g N, N-diethylacrylamide, 35g phenol, 10g sodium allylsulfonate and 12g hydrolyzed ammonium salt of acrylon with viscosity of 17.6 in 200g water to form a mixed system; adjusting the pH value of the mixed system to about 6 to form a buffer system; and (3) heating the buffer system to 80 ℃, and adding 0.8g of ammonium persulfate and 15g of chain transfer agent under the stirring condition for reaction to obtain the fluid loss agent.
Example 7
Dissolving 100g of acrylamide, 35g of phenol, 15g of sodium styrene sulfonate and 10g of acrylic fiber hydrolyzed ammonium salt with the viscosity of 17.6 in 200g of water to form a mixed system; adjusting the pH value of the mixed system to about 6 to form a buffer system; and (3) heating the buffer system to 80 ℃, and adding 0.8g of ammonium persulfate and 15g of chain transfer agent under the stirring condition for reaction to obtain the fluid loss agent.
Example 8
Dissolving 100g of acrylamide, 35g of phenol, 15g of 2-acrylamido octyl sodium sulfonate and 10g of acrylic fiber hydrolyzed ammonium salt with the viscosity of 17.6 in 200g of water to form a mixed system; adjusting the pH value of the mixed system to about 6 to form a buffer system; and (3) heating the buffer system to 80 ℃, and adding 0.8g of ammonium persulfate and 15g of chain transfer agent under the stirring condition for reaction to obtain the fluid loss agent.
Example 9
Dissolving 100g of acrylamide, 35g of 4-carboxyphenol, 10g of sodium allylsulfonate and 10g of acrylic fiber hydrolyzed ammonium salt with the viscosity of 17.6 in 200g of water to form a mixed system; adjusting the pH value of the mixed system to about 6 to form a buffer system; and (3) heating the buffer system to 80 ℃, and adding 0.8g of ammonium persulfate and 15g of chain transfer agent under the stirring condition for reaction to obtain the fluid loss agent.
Example 10
Dissolving 100g N-vinyl methyl acetamide, 35g phenol, 10g sodium allylsulfonate and 10g hydrolyzed ammonium salt of acrylic fiber with viscosity of 17.6 in 200g water to form a mixed system; adjusting the pH value of the mixed system to about 6 to form a buffer system; and (3) heating the buffer system to 80 ℃, and adding 0.8g of ammonium persulfate and 15g of chain transfer agent under the stirring condition for reaction to obtain the fluid loss agent.
Comparative example 1
Dissolving 100g of acrylamide, 35g of phenol and 10g of sodium allylsulfonate in 200g of water to form a mixed system; adjusting the pH value of the mixed system to about 6 to form a buffer system; and (3) heating the buffer system to 80 ℃, and adding 0.8g of ammonium persulfate and 15g of chain transfer agent under the stirring condition for reaction to obtain the fluid loss agent.
Comparative example 2
Dissolving 100g of acrylamide, 35g of phenol, 10g of sodium allylsulfonate and 20g of acrylic fiber hydrolyzed ammonium salt with the viscosity of 17.6 in 200g of water to form a mixed system; adjusting the pH value of the mixed system to about 6 to form a buffer system; and (3) heating the buffer system to 80 ℃, and adding 0.8g of ammonium persulfate and 15g of chain transfer agent under the stirring condition for reaction to obtain the fluid loss agent.
Comparative example 3
Dissolving 100g of acrylamide, 35g of phenol, 10g of sodium allylsulfonate and 2g of acrylic fiber hydrolyzed ammonium salt with the viscosity of 17.6 in 200g of water to form a mixed system; adjusting the pH value of the mixed system to about 6 to form a buffer system; and (3) heating the buffer system to 80 ℃, and adding 0.8g of ammonium persulfate and 15g of chain transfer agent under the stirring condition for reaction to obtain the fluid loss agent.
Comparative example 4
Dissolving 100g of acrylamide, 50g of phenol, 10g of sodium allylsulfonate and 10g of acrylic fiber hydrolyzed ammonium salt with the viscosity of 17.6 in 200g of water to form a mixed system; adjusting the pH value of the mixed system to about 6 to form a buffer system; and (3) heating the buffer system to 80 ℃, and adding 0.8g of ammonium persulfate and 15g of chain transfer agent under the stirring condition for reaction to obtain the fluid loss agent.
Comparative example 5
Dissolving 80g of acrylamide, 35g of phenol, 10g of sodium allylsulfonate and 10g of acrylic fiber hydrolyzed ammonium salt with the viscosity of 17.6 in 200g of water to form a mixed system; adjusting the pH value of the mixed system to about 6 to form a buffer system; and (3) heating the buffer system to 80 ℃, and adding 0.8g of ammonium persulfate and 15g of chain transfer agent under the stirring condition for reaction to obtain the fluid loss agent.
Comparative example 6
Dissolving 150g of acrylamide, 35g of phenol, 10g of sodium allylsulfonate and 10g of acrylic fiber hydrolyzed ammonium salt with the viscosity of 17.6 in 200g of water to form a mixed system; adjusting the pH value of the mixed system to about 6 to form a buffer system; and (3) heating the buffer system to 80 ℃, and adding 0.8g of ammonium persulfate and 15g of chain transfer agent under the stirring condition for reaction to obtain the fluid loss agent.
The performance of the filtrate reducer obtained in each of the above examples and comparative examples was tested by the following method:
1) detection of fresh water slurries
350mL of distilled water, 1.0g of sodium bicarbonate, 0.28g of sodium carbonate, 8.0g of bentonite for preparing a drilling fluid test slurry and 24.5g of evaluation soil for drilling fluid test are added into sample cups of two high-speed stirrers, stirred on the high-speed stirrer for 20min, and maintained for 16h at 220 ℃ in a rolling manner, so that 17 parts of base slurry is formed in total according to the method. After 16 parts of the base slurry, corresponding to examples 1 to 10 and comparative examples 1 to 6, were added 1.75g of the resulting filtrate reducer and the other part of the base slurry was used as a blank, and the mixture was stirred in a high-speed stirrer for 20 minutes and then maintained at 220 ℃ for 16 hours by rolling. Then, the mixture was stirred at a high speed for 5 minutes, and the fluid loss was measured. The fluid loss and the rate of decrease in fluid loss were calculated as follows. The calculation results are shown in Table 1.
FL＝2×FL'
In the formula:
FL-fluid loss, milliliters (ml);
the filtration loss of FL' -7.5 min-30 min is milliliter (ml);
f-loss reduction in filtration, percent (%);
FL1base slurry fluid loss in milliliters (ml);
FL2the amount of filtrate in milliliters (ml) after sample addition.
2) Detection of brine slurries
350mL of 4% saline water, 1.0g of sodium bicarbonate, 1.12g of sodium carbonate, 32.0g of bentonite for preparing a slurry for a drilling fluid test and 24.5g of evaluation soil for a drilling fluid test are added into sample cups of two high-speed stirrers, the mixture is stirred on the high-speed stirrer for 20min, the mixture is maintained for 16h in a rolling manner at 220 ℃, and 17 parts of base slurry is formed in total according to the method. After 16 parts of the base slurry were prepared in a one-to-one correspondence manner to examples 1 to 10 and comparative examples 1 to 6, 5.25g of the filtrate reducer thus prepared was added, and the other part of the base slurry was used as a blank, followed by high-speed stirring for 20min and roll curing at 220 ℃ for 16 hours. Stirring at high speed for 5 min. The fluid loss and the rate of fluid loss reduction were calculated according to the above equations. The calculation results are shown in Table 1.
TABLE 1
As can be seen from the data in Table 1, the fluid loss additive of the present application has a remarkable fluid loss effect at high temperature (220 ℃).
From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects:
the alkenyl amide is a basic monomer which forms a main chain structure of the fluid loss additive and plays a role of a skeleton; the phenol compound increases a benzene ring structure on a main chain, weakens the high-temperature desorption effect of molecules caused by high-temperature movement by utilizing the rigidity of the benzene ring structure, and the benzene ring structure can effectively block the invasion of metal cations, thereby protecting clay particles in a high-salt and high-calcium environment and improving the salt invasion and calcium invasion resistance of the clay particles; sulfonate is used to introduce sulfonic group with strongest hydrophilic performance into the side chain of the fluid loss additive, so that the fluid loss additive still has strong hydration capability and salt resistance at high temperature. The carbon chain of the waste acrylic fiber hydrolyzed ammonium salt can be polymerized with other components and can be used as a cationic monomer, so that the adsorptive group of the filtrate reducer is changed from anionic enamine group to cationic quaternary amine group, and further more stable electrostatic adsorption is formed. Therefore, the filtrate reducer prepared by the mixture formed by the components has high temperature resistance and salt resistance, and meanwhile, the waste acrylic fibers in the waste acrylic fiber hydrolyzed ammonium salt are waste materials which can be sourced from waste clothes, textile leftover materials and the like, so that the cost is low, and the cost of the filtrate reducer can be reduced. Further, the addition of the chain transfer agent controls the chain length of the fluid loss additive formed by polymerization, and further controls the viscosity and film forming properties of the fluid loss additive.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. An environment-friendly cationic fluid loss composition, comprising, in parts by weight: 9-12 parts of alkenyl amide, 3-4 parts of phenol compounds, 1.0-1.5 parts of alkenyl sulfonate, 0.5-1.5 parts of waste acrylic fiber hydrolyzed ammonium salt and 1.2-3.5 parts of chain transfer agent,
the alkenyl amide is selected from one or more of acrylamide, N-dimethylacrylamide, N-diethylacrylamide, N-vinylacetamide, N-vinylmethylacetamide and N-vinylethylacetamide,
the alkenyl sulfonate is selected from any one of allyl sulfonate and 2-acrylamide alkyl sulfonate,
the viscosity of the waste acrylic fiber hydrolyzed ammonium salt measured at 95 ℃ is 15-19/m Pa.s,
the chain transfer agent is selected from one or more of tert-dodecyl mercaptan, n-dodecyl mercaptan, isopropanol, isobutanol, mercaptoethanol, thioglycolic acid, pentene and isooctyl 3-mercaptopropionate,
the composition further comprises 0.04-0.1 part of an initiator.
2. The composition as claimed in claim 1, wherein the alkenyl amide is 9.5 to 10.5 parts by weight, and the waste acrylic fiber hydrolyzed ammonium salt is 0.7 to 1.2 parts by weight.
3. The composition according to claim 1, characterized in that the phenolic compound has the general structural formula (I)
General formula (I)
Wherein R is1、R2And R3Each independently selected from-H, -CONH2、-SO3K、-SO3Any one of Na, -COOH and-CN.
4. The composition of claim 1, wherein the initiator is ammonium persulfate or potassium persulfate.
5. An environmentally friendly cationic fluid loss additive prepared from a fluid loss composition, wherein the fluid loss composition is the composition of any one of claims 1 to 4.
6. The fluid loss additive according to claim 5, wherein the preparation method of the fluid loss additive comprises the following steps:
dissolving alkenyl amide, phenol compounds, alkenyl sulfonate and waste acrylic fiber hydrolyzed ammonium salt in water to form a mixed system;
adjusting the pH value of the mixed system to be 5-6.5 to form a buffer system;
and heating the buffer system to 50-90 ℃, and adding an initiator and a chain transfer agent under a stirring condition to react to obtain the filtrate reducer.
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| US4749498A (en) * | 1984-02-09 | 1988-06-07 | Wolff Walsrode Aktiengesellschaft | Water-soluble polymers and their use as flushing liquid additives for drilling |
| CN104371675A (en) * | 2013-08-12 | 2015-02-25 | 中国石油化工股份有限公司 | Fluid loss additive for drilling fluid |
| CN104910330A (en) * | 2015-06-16 | 2015-09-16 | 北京中科天启油气技术有限公司 | High-density fluid loss additive for drilling fluids and preparation method thereof |
| CN105255458A (en) * | 2015-11-30 | 2016-01-20 | 齐鲁工业大学 | Preparation method of efficient temperature-resisting and salinity-resisting filtrate reducer for drilling fluid |
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2019
- 2019-07-30 CN CN201910696254.4A patent/CN110483686B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4749498A (en) * | 1984-02-09 | 1988-06-07 | Wolff Walsrode Aktiengesellschaft | Water-soluble polymers and their use as flushing liquid additives for drilling |
| CN104371675A (en) * | 2013-08-12 | 2015-02-25 | 中国石油化工股份有限公司 | Fluid loss additive for drilling fluid |
| CN104910330A (en) * | 2015-06-16 | 2015-09-16 | 北京中科天启油气技术有限公司 | High-density fluid loss additive for drilling fluids and preparation method thereof |
| CN105255458A (en) * | 2015-11-30 | 2016-01-20 | 齐鲁工业大学 | Preparation method of efficient temperature-resisting and salinity-resisting filtrate reducer for drilling fluid |
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