CN113563508B - High-temperature-resistant low-viscosity filtrate reducer - Google Patents
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/52—Amides or imides
- C08F220/54—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide
- C08F220/56—Acrylamide; Methacrylamide
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/10—Esters
- C08F220/26—Esters containing oxygen in addition to the carboxy oxygen
- C08F220/28—Esters containing oxygen in addition to the carboxy oxygen containing no aromatic rings in the alcohol moiety
- C08F220/281—Esters containing oxygen in addition to the carboxy oxygen containing no aromatic rings in the alcohol moiety and containing only one oxygen, e.g. furfuryl (meth)acrylate or 2-methoxyethyl (meth)acrylate
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/42—Nitriles
- C08F220/44—Acrylonitrile
- C08F220/48—Acrylonitrile with nitrogen-containing monomers
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F226/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a single or double bond to nitrogen or by a heterocyclic ring containing nitrogen
- C08F226/06—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a single or double bond to nitrogen or by a heterocyclic ring containing nitrogen by a heterocyclic ring containing nitrogen
- C08F226/10—N-Vinyl-pyrrolidone
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/02—Well-drilling compositions
- C09K8/03—Specific additives for general use in well-drilling compositions
- C09K8/035—Organic additives
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/02—Well-drilling compositions
- C09K8/04—Aqueous well-drilling compositions
- C09K8/14—Clay-containing compositions
- C09K8/18—Clay-containing compositions characterised by the organic compounds
- C09K8/22—Synthetic organic compounds
- C09K8/24—Polymers
Abstract
The invention relates to a high-temperature-resistant low-viscosity fluid loss additive, belonging to the technical field of petrochemical materials. According to the invention, by introducing the biphenyl structure with full aromatic rings and distorted non-coplanar, the molecular chain of the polymer is easier to wind, the solubility and stability of the polymer are improved, the polymer with overlong molecular chain does not need to be synthesized, and the influence on the viscosity of the drilling fluid is small; the polymer is adsorbed on the surface of clay through strong electrostatic action in drilling fluid to play roles in inhibiting expansion of clay particles and stabilizing colloid, and a layer of viscoelastic macromolecular adsorption film can be formed on the clay on the other side of a molecular chain, so that the flow of water molecules can be restrained, the permeability is reduced, and the invasion of metal can be effectively blocked, so that the clay particles are protected in a high-salt and high-calcium environment, and the salt invasion and calcium invasion resistance of the clay particles is improved; the additive is suitable for the fluid loss reduction of drilling fluids under various densities, has strong salt resistance and inhibitive performance and a certain dilution effect, and can effectively control the fluid loss reduction performance of the drilling fluids under the high-temperature condition.
Description
Technical Field
The invention relates to a high-temperature-resistant low-viscosity fluid loss additive, belonging to the technical field of petrochemical materials.
Background
Fluid loss of a drilling fluid refers to the phenomenon in which the drilling fluid in the wellbore diffuses into the formation due to pressure during drilling. The excessive filtration loss in unit time can cause a series of problems of loss of effective content of drilling fluid, collapse of well wall, reduction of well diameter, uncontrollable rheological property of the drilling fluid and the like, and brings great difficulty to the exploitation of crude oil, so the control of the filtration loss of the drilling fluid is particularly important, and the current control method mainly adjusts the filtration loss of the drilling fluid by adding a filtrate reducer. As hydrocarbon reservoirs are further developed, the higher the temperature of the reservoir. Under the condition of ultrahigh temperature, the rheological property of the drilling fluid shows a worsening trend along with the change of time, and the viscosity of the drilling fluid shows a high-temperature viscosity reduction phenomenon or a high-temperature thickening phenomenon, so that the rheological property of the drilling fluid is uncontrollable, and a series of accidents are caused. 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 plays a vital role in the drilling construction process, is one of important treatment agents of drilling fluid, and is mainly divided into celluloses, humic acids, acrylic acids, starches, resins and the like according to the source. 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 great influence on the rheological property of the drilling fluid, high cost, complex preparation and the like exist.
Disclosure of Invention
The invention aims to provide a high-temperature-resistant low-viscosity fluid loss additive aiming at the defects of the prior art; the filtrate reducer leads the molecular chain of the polymer to be easier to wind by introducing the full aromatic ring and the twisted non-coplanar biphenyl structure, improves the solubility and the stability of the polymer, does not need to synthesize the polymer with overlong molecular chain, and has small influence on the viscosity of the drilling fluid; the drilling fluid can be adsorbed on the surface of clay through strong static electricity to play roles in inhibiting expansion of clay particles and stabilizing colloid, and a layer of viscoelastic macromolecular adsorption film can be formed on the clay on the other side of a molecular chain, so that the flow of water molecules can be restrained, the permeability is reduced, the effect of reducing the filtration loss of the drilling fluid to a stratum in a drilling process is achieved, and the invasion of metal can be effectively blocked, so that the clay particles are protected in a high-salt high-calcium environment, and the salt invasion and calcium invasion resistance of the clay particles is improved; the drilling fluid has strong filtrate loss reduction in fresh water slurry and saline water slurry, is suitable for filtrate loss reduction of drilling fluid under various densities, has strong salt resistance and inhibition, has a certain dilution effect, and can effectively control the filtrate loss reduction performance of the drilling fluid under the high-temperature condition.
The invention realizes the purpose through the following technical scheme:
the high-temperature-resistant low-viscosity fluid loss additive is characterized by being prepared by initiating polymerization of a component A, 2-allyl-4- (4- (allyloxy) phenyl) -2, 3-phthalazinone, a component B and a dispersant in water by a free radical initiator;
the weight percentages of the component A, the 2-allyl-4- (4- (allyloxy) phenyl) -2, 3-phthalazinone, the component B, the dispersant and the water are as follows:
2 to 16 percent of the component A
2-allyl-4- (4- (allyloxy) phenyl) -2, 3-phthalazinone 0.5-1.5%
2 to 16 percent of the component B
0.05 to 0.5 percent of dispersant
0.0005 to 0.005 percent of free radical initiator
The balance of water;
wherein:
the component A is a water-soluble monomer with carbon-carbon double bonds, and is prepared from the following raw materials in percentage by weight, acrylamide, acrylonitrile and styrene = 1-3: 1;
the component B is a monomer with a side chain containing a rigid group or a long chain, and is composed of the following raw materials by weight ratio, N-vinyl pyrrolidone, 2-hydroxyethyl acrylate, ethoxylated-2-hydroxyethyl acrylate, 2-acrylamide-2-methylpropanesulfonic acid = 1-4: 1;
the dispersant is any one of polyvinyl alcohol, hydrolyzed polymaleic anhydride, tween-80 and polyacrylamide;
the free radical initiator is azobisisobutyronitrile.
When the high-temperature-resistant low-viscosity fluid loss additive is used for filtration reduction of drilling fluid, the high-temperature-resistant low-viscosity fluid loss additive is directly added into the drilling fluid, and the adding proportion is 1-5% of the weight of the drilling fluid.
Compared with the prior art, the invention has the beneficial effects that:
the main chain of the high-temperature-resistant low-viscosity fluid loss additive contains a full-aromatic ring and a twisted non-coplanar biphenyl structure, so that a molecular chain is easier to wind to form a net structure, and the high-temperature-resistant low-viscosity fluid loss additive can resist higher temperature under the condition of the same molecular weight. In the construction process, the uncontrollable performance of drilling fluid can not be caused due to the great change of the rheological property of the fluid loss additive, so that a series of accidents such as the reduction of sand carrying capacity and the sticking of a drill bit can not be caused. And the side chain of the molecule contains a certain rigid structure, such as benzene ring, pyrrolidone and the like, so that the stability of the fluid loss additive at high temperature is ensured. Meanwhile, in the drilling fluid, the drilling fluid can be adsorbed on the surface of clay through electrostatic action, and a layer of viscoelastic macromolecular adsorption film can be formed on the clay on the other side of a molecular chain, so that the flow of water molecules can be restrained, the permeability is reduced, the effect of reducing the filtration loss of the drilling fluid to a stratum in the drilling process is achieved, and the invasion of metal ions can be effectively blocked, thereby protecting clay particles in a high-salt and high-calcium environment and improving the salt invasion and calcium invasion resistance of the drilling fluid. The high-temperature-resistant low-viscosity fluid loss additive is suitable for fluid loss reduction of drilling fluids under various densities, has strong salt resistance and inhibitive performance and a certain dilution effect, can be directly added into the drilling fluid, can effectively control the fluid loss performance of the drilling fluid under the high-temperature condition, and enhances the high-temperature resistance of the drilling fluid, thereby improving the drilling efficiency and reducing the comprehensive cost of the drilling fluid. Solves the problems that the prior high-temperature resistant fluid loss additive has large influence on the rheological property of the drilling fluid, high production and use cost, complex preparation process and the like.
Detailed Description
The present invention is further illustrated by the following examples, which are not intended to limit the invention in any way. The reagents, methods and apparatus employed in the present invention are conventional in the art, except as otherwise indicated.
Example 1
The filtrate reducer is prepared from a component A (the weight ratio of acrylamide to acrylonitrile to styrene is 3: 1), 2-allyl-4- (4- (allyloxy) phenyl) -2, 3-phthalazinone, a component B (the weight ratio of N-vinyl pyrrolidone to 2-hydroxyethyl acrylate to ethoxylated-2-hydroxyethyl acrylate to 2-acrylamido-2-methylpropanesulfonic acid is 1: 2: 1) and polyvinyl alcohol and azodiisobutyronitrile by adopting a suspension polymerization mode.
The preparation method comprises the following steps:
weighing the following raw materials in percentage by weight: component A8%, 2-allyl-4- (4- (allyloxy) phenyl) -2, 3-phthalazinone 2%, component B8%, water 81.897%, polyvinyl alcohol 0.1%, azobisisobutyronitrile 0.003%; sequentially adding 8% of the component A,2% of 2-allyl-4- (4- (allyloxy) phenyl) -2, 3-phthalazinone, 8% of the component B and 81.897% of water into a flask, adding 0.1% of polyvinyl alcohol, and fully stirring uniformly until the polyvinyl alcohol is completely dissolved to prepare a mixed solution; and introducing nitrogen into the mixed solution for 30 minutes, then adding 0.003 percent of azobisisobutyronitrile, reacting for 3 hours at the temperature of 65 ℃, washing a colloidal product prepared by the reaction for 2-3 times by using ethanol, and drying and crushing to obtain the high-temperature-resistant low-viscosity fluid loss additive.
Example 2
The filtrate reducer is prepared from a component A (the weight ratio of acrylamide to acrylonitrile to styrene is 2: 1), 2-allyl-4- (4- (allyloxy) phenyl) -2, 3-phthalazinone, a component B (the weight ratio of N-vinyl pyrrolidone to 2-hydroxyethyl acrylate to ethoxylated-2-hydroxyethyl acrylate to 2-acrylamido-2-methylpropanesulfonic acid is 2: 1), hydrolyzed polymaleic anhydride and azobisisobutyronitrile in by adopting a suspension polymerization mode.
The preparation method comprises the following steps:
weighing the following raw materials in percentage by weight: component A4%, 2-allyl-4- (4- (allyloxy) phenyl) -2, 3-phthalazinone 2%, component B6%, water 87.785%, hydrolyzed polymaleic anhydride 0.2%, azobisisobutyronitrile 0.015%; sequentially adding 4% of the component A,2% of 2-allyl-4- (4- (allyloxy) phenyl) -2, 3-phthalazinone, 6% of the component B and 87.785% of water into a flask, adding 0.2% of hydrolyzed polymaleic anhydride, and fully stirring uniformly until the components are completely dissolved to prepare a mixed solution; and introducing nitrogen into the mixed solution for 30 minutes, then adding 0.015% of azodiisobutyronitrile, controlling the temperature to react for 2-3 hours at 65 ℃, washing a colloidal product obtained by the reaction for 2-3 times by using ethanol, and then drying and crushing to obtain the high-temperature-resistant low-viscosity fluid loss additive.
Example 3
The filtrate reducer is prepared from a component A (the weight ratio of acrylamide to acrylonitrile to styrene is 2: 1), 2-allyl-4- (4- (allyloxy) phenyl) -2, 3-phthalazinone, a component B (the weight ratio of N-vinyl pyrrolidone to 2-hydroxyethyl acrylate to ethoxylated-2-hydroxyethyl acrylate to 2-acrylamido-2-methylpropanesulfonic acid is 1: 1) and Tween-80 and azobisisobutyronitrile by adopting a suspension polymerization mode.
The preparation method comprises the following steps:
weighing the following raw materials in percentage by weight: component A8%, 2-allyl-4- (4- (allyloxy) phenyl) -2, 3-phthalazinone 2%, component B8%, water 81.699%, tween-80.3%, azobisisobutyronitrile 0.001%; sequentially adding 8% of the component A,2% of 2-allyl-4- (4- (allyloxy) phenyl) -2, 3-phthalazinone, 8% of the component B and 81.699% of water into a flask, adding 0.3% of tween-80, and fully stirring uniformly until the components are completely dissolved to prepare a mixed solution; and introducing nitrogen into the mixed solution for 30 minutes, then adding 0.001% of azodiisobutyronitrile, controlling the temperature to react for 2 to 3 hours at 55 ℃, drying and crushing the colloidal product obtained by the reaction, and washing the colloidal product for 2 to 3 times by using ethanol to obtain the high-temperature-resistant low-viscosity fluid loss additive.
Example 4
The filtrate reducer is prepared from a component A (the weight ratio of acrylamide to acrylonitrile to styrene is 1: 2: 1), 2-allyl-4- (4- (allyloxy) phenyl) -2, 3-phthalazinone, a component B (the weight ratio of N-vinyl pyrrolidone to 2-hydroxyethyl acrylate to ethoxylated-2-hydroxyethyl acrylate to 2-acrylamido-2-methylpropanesulfonic acid is 1: 3: 1), polyacrylamide and azobisisobutyronitrile by adopting a suspension polymerization mode.
The preparation method comprises the following steps:
weighing the following raw materials in percentage by weight: component A4%, 2-allyl-4- (4- (allyloxy) phenyl) -2, 3-phthalazinone 2%, component B10%, water 83.698%, polyacrylamide 0.3%, azobisisobutyronitrile 0.002%; adding 4% of component A,2% of 2-allyl-4- (4- (allyloxy) phenyl) -2, 3-phthalazinone, 10% of component B and 83.698% of water into a flask in sequence, adding 0.3% of polyacrylamide, and fully and uniformly stirring until the polyacrylamide is completely dissolved to prepare a mixed solution; and introducing nitrogen into the mixed solution for 30 minutes, then adding 0.002% of azobisisobutyronitrile, controlling the temperature at 55 ℃ for reacting for 2-3 hours, washing the colloidal product obtained by the reaction with ethanol for 2-3 times, and drying and crushing to obtain the high-temperature-resistant low-viscosity fluid loss additive.
The application test condition of the high-temperature-resistant low-viscosity fluid loss additive in the field is as follows.
Preparing fresh water base slurry:
350mL of tap water is added into a sample cup of a high-speed stirrer, 16g of calcium-earth is added under stirring, 2.4g of sodium carbonate is added after full stirring, high-speed stirring is carried out for 0.5h, earth adhered to the wall of a plastic barrel is scraped off 2 times during stirring, and the mixture is maintained for 24h for later use. 5 parts of base slurry are prepared according to the method, 1 percent of filtrate loss reducer is added into 4 parts of base slurry, and one part is a blank sample. Stirring and mixing for 30min at the rotating speed of 3000r/min by using a high-speed stirrer, referring to 8CN112625661A standard GB/T16783-2014 on page 6/7 of the national standard specification, measuring the normal-temperature medium-pressure filtration loss and the rheological property by using an SN-6A type drilling fluid filtration loss reducing tester, and testing the API filtration loss data of the drilling fluid under the condition that the pressure is 0.69 MPa; and then hot rolling for 16h at the temperature of 180 ℃, and determining the API (American Petroleum institute) filtrate loss data and rheological property of the drilling fluid again, wherein specific results are shown in a table 1:
preparing saline water-based slurry:
350mL of tap water is added into a sample cup of a high-speed stirrer, 16g of calcium soil is added under stirring, 2.4g of sodium carbonate and 120g of sodium chloride are added after full stirring, the mixture is stirred at a high speed for 0.5h, the soil adhered to the wall of the plastic barrel is scraped off for 2 times during stirring, and the mixture is maintained for later use after 24 h. 5 parts of base slurry are prepared according to the method, 4 parts of base slurry are added with 1 percent filtrate reducer, and one part of blank sample. Stirring and mixing the mixture for 30min at the rotating speed of 3000r/min by using a high-speed stirrer, determining the normal-temperature medium-pressure filtration loss and the rheological property by using an SN-6A type drilling fluid filtration loss tester according to the national standard GB/T16783.1-2014, and testing the API filtration loss data of the drilling fluid under the condition that the pressure is 0.69 MPa; and then hot rolling for 16h at the temperature of 180 ℃, and determining the API (American Petroleum institute) filtration loss and rheological property of the drilling fluid again, wherein the specific results are shown in a table 2:
TABLE 1
TABLE 2
The test results in tables 1 and 2 show that the filtrate loss reduction performance before and after aging at 180 ℃ is excellent at the addition of 1%, and the rheological effect on the drilling fluid is small. The product obtained by the invention has good temperature resistance, salt resistance and fluid loss reduction performance, and the performances can meet the construction requirements of high-temperature drilling.
While the invention has been described with reference to specific embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.
Claims (2)
1. The high-temperature-resistant low-viscosity fluid loss additive is characterized by being prepared by initiating polymerization of a component A, 2-allyl-4- (4- (allyloxy) phenyl) -2, 3-phthalazinone, a component B and a dispersant in water by a free radical initiator;
the weight percentages of the component A, the 2-allyl-4- (4- (allyloxy) phenyl) -2, 3-phthalazinone, the component B, the dispersant and the water are as follows:
2 to 16 percent of the component A
2-allyl-4- (4- (allyloxy) phenyl) -2, 3-phthalazinone 0.5-1.5%
2 to 16 percent of the component B
0.05 to 0.5 percent of dispersant
0.0005 to 0.005 percent of free radical initiator
The balance of water;
wherein:
the component A is a water-soluble monomer with carbon-carbon double bonds, and is prepared from the following raw materials in percentage by weight, acrylamide, acrylonitrile and styrene = 1-3: 1;
the component B is a monomer with a side chain containing a rigid group or a long chain, and is composed of the following raw materials by weight ratio, N-vinyl pyrrolidone, 2-hydroxyethyl acrylate, ethoxylated-2-hydroxyethyl acrylate, 2-acrylamide-2-methylpropanesulfonic acid = 1-4: 1;
the dispersant is any one of polyvinyl alcohol, hydrolyzed polymaleic anhydride, tween-80 and polyacrylamide;
the free radical initiator is azobisisobutyronitrile.
2. The high temperature resistant low viscosity fluid loss additive of claim 1, wherein: when the high-temperature-resistant low-viscosity fluid loss additive is used for reducing the fluid loss of drilling fluid, the high-temperature-resistant low-viscosity fluid loss additive is directly added into the drilling fluid, and the adding proportion is 1-5% of the weight of the drilling fluid.
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