CN107814870B - Spherical polymer treating agent for high-temperature-resistant drilling fluid and preparation method thereof - Google Patents
Spherical polymer treating agent for high-temperature-resistant drilling fluid and preparation method thereof Download PDFInfo
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- 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
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- C08F220/54—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide
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- C08F2/00—Processes of polymerisation
- C08F2/12—Polymerisation in non-solvents
- C08F2/16—Aqueous medium
- C08F2/22—Emulsion polymerisation
- C08F2/24—Emulsion polymerisation with the aid of emulsifying agents
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- C08F2/00—Processes of polymerisation
- C08F2/12—Polymerisation in non-solvents
- C08F2/16—Aqueous medium
- C08F2/22—Emulsion polymerisation
- C08F2/24—Emulsion polymerisation with the aid of emulsifying agents
- C08F2/30—Emulsion polymerisation with the aid of emulsifying agents non-ionic
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- 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
- C08F220/04—Acids; Metal salts or ammonium salts thereof
- C08F220/06—Acrylic acid; Methacrylic acid; Metal salts or ammonium salts thereof
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- 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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- 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
- C08F220/58—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide containing oxygen in addition to the carbonamido oxygen, e.g. N-methylolacrylamide, N-(meth)acryloylmorpholine
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- 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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- 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
- C08F220/58—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide containing oxygen in addition to the carbonamido oxygen, e.g. N-methylolacrylamide, N-(meth)acryloylmorpholine
- C08F220/585—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide containing oxygen in addition to the carbonamido oxygen, e.g. N-methylolacrylamide, N-(meth)acryloylmorpholine and containing other heteroatoms, e.g. 2-acrylamido-2-methylpropane sulfonic acid [AMPS]
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- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/10—Nanoparticle-containing well treatment fluids
Abstract
The invention provides a spherical polymer treating agent for drilling fluid. The spherical polymer treating agent for the drilling fluid is prepared from the following raw materials in parts by mass: 40-56 parts of an oil phase; 40-56 parts of a water phase; 2-5 parts of an initiator; 2-5 parts of a cross-linking agent. The spherical polymer treating agent for the drilling fluid is three-dimensional spherical in appearance, and the particle size is 100-500 nm. From the experimental results of the embodiments 1 to 3, it can be seen that the spherical polymer treating agent for drilling fluid obtained by the present invention has a slightly reduced viscosity and a slightly increased fluid loss after high temperature aging of bentonite slurry, while the common polyacrylamide and xanthan gum have no viscosity and no fluid loss reduction effect after high temperature aging; the spherical polymer treating agent for the drilling fluid, which is obtained by the invention, can obviously maintain the viscosity of the drilling fluid in a normal range when added into the drilling fluid, and has low filtration loss; common polyacrylamide and xanthan gum have no viscosity after being aged at high temperature, and have very large filtration loss.
Description
Technical Field
The invention relates to the technical field of drilling, in particular to a spherical polymer treating agent for high-temperature-resistant drilling fluid and a preparation method thereof.
Background
With the continuous increase of world energy demand and gradual depletion of shallow layer oil and gas resources, the center of gravity of oil and gas exploration is gradually shifted to deep strata or ultra-deep strata in the future, and drilling of deep wells and ultra-deep wells becomes an important direction for the development of the drilling industry in the future. The most outstanding problems in the operation of deep wells and ultra-deep wells are underground high temperature (more than 180 ℃) and ultra-high temperature environment, and a key technology for ensuring the smooth development of deep wells and ultra-deep wells is high-performance drilling fluid.
The high-performance drilling fluid is mainly improved in performance by various treatment agents added in the high-performance drilling fluid, such as a lubricant, a viscosity reducer, a plugging agent, a tackifier, a defoaming agent and the like. The polymer drilling fluid treating agent is the treating agent with the fastest development, the highest level, the best application effect and the largest dosage in all treating agents.
The drilling fluid performance is closely related to the polymer treating agent, and the progress, safety and efficiency of high-temperature deep well and ultra-deep well operation are determined to a great extent. The common polymer treating agent for the drilling fluid is greatly influenced by temperature and is easy to break and degrade at high temperature, so that the function of the treating agent is ineffective. For example, polyacrylamide-based treating agents, which resist temperatures of only 150 ℃ and fail above this temperature; biopolymers such as xanthan gum and locust gum are resistant to temperatures of up to 150 ℃. Therefore, in high-temperature deep well drilling, after the drilling fluid using the traditional polymer treating agent is circulated at high temperature underground, the performance of the drilling fluid is generally deteriorated, so that the problems of mud cake thickening, poor wall forming performance, filtration loss increase and the like are caused, and even serious accidents such as drilling abandonment and the like are caused by the settlement of weighted materials such as barite and the like.
Disclosure of Invention
The invention aims to provide a spherical polymer treating agent for high-temperature-resistant drilling fluid and a preparation method thereof.
The invention provides a spherical polymer treating agent for drilling fluid, which is prepared from the following raw materials in parts by mass:
the oil phase comprises white oil and an emulsifier, and the mass ratio of the emulsifier to the white oil is 3-5: 100;
the water phase comprises 2-acrylamido-2-methylpropanesulfonic acid, N-diethylacrylamide, methacrylic acid and acrylamide, and the mass ratio of the 2-acrylamido-2-methylpropanesulfonic acid to the N, N-diethylacrylamide to the methacrylic acid to the acrylamide is (30-40): 20-40): 10-20.
Preferably, the emulsifier comprises span and oleic acid diethanolamide, and the mass ratio of the span to the oleic acid diethanolamide is (40-50): (40-60).
Preferably, the emulsifier further comprises fumed silica;
the mass ratio of the fumed silica to the span is (0, 10): 40,50 ].
Preferably, the initiator is one or more of peroxide initiators and persulfates.
Preferably, the cross-linking agent is one or more of methylene bisacrylamide, N-hydroxyethyl acrylamide and diacetone acrylamide.
The invention provides a preparation method of a spherical polymer treating agent for drilling fluid, which comprises the following steps:
mixing the oil phase and the water phase, and performing primary heating treatment to obtain an oil-water mixture;
mixing the oil-water mixture and an initiator to carry out secondary heating treatment to obtain a mixture containing the initiator;
and mixing the mixture containing the initiator and the cross-linking agent for polymerization reaction to obtain the spherical polymer treating agent for the drilling fluid.
Preferably, the temperature of the primary heating treatment is 40-50 ℃;
the time of the primary heating treatment is 1-3 hours.
Preferably, the temperature of the secondary heating treatment is 60-80 ℃;
the time of the secondary heating treatment is 1-3 hours.
Preferably, the temperature of the polymerization reaction is 40-50 ℃;
the time of the polymerization reaction is 4-5 hours.
The invention provides a spherical polymer treating agent for drilling fluid. The spherical polymer treating agent for the drilling fluid is prepared from the following raw materials in parts by mass: 40-56 parts of an oil phase; 40-56 parts of a water phase; 2-5 parts of an initiator; 2-5 parts of a crosslinking agent; the oil phase comprises white oil and an emulsifier, and the mass ratio of the emulsifier to the white oil is 3-5: 100; the water phase comprises 2-acrylamido-2-methylpropanesulfonic acid, N-diethylacrylamide, methacrylic acid and acrylamide, and the mass ratio of the 2-acrylamido-2-methylpropanesulfonic acid to the N, N-diethylacrylamide to the methacrylic acid to the acrylamide is (30-40): 20-40): 10-20. The spherical polymer treating agent for the drilling fluid, which is obtained by the invention, has excellent high-temperature resistance, salt resistance and a certain fluid loss reduction effect. The experimental results of the embodiments 1 to 3 show that the particle size distribution of the spherical polymer treating agent for drilling fluid obtained by the invention is 100 to 500nm, the viscosity is slightly reduced and the filtration loss is slightly increased after the high-temperature aging of the bentonite slurry, while the common polyacrylamide and xanthan gum have no viscosity and no filtration loss reduction effect after the high-temperature aging; the spherical polymer treating agent for the drilling fluid, which is obtained by the invention, can obviously maintain the viscosity of the drilling fluid in a normal range when added into the drilling fluid, and has low filtration loss; common polyacrylamide and xanthan gum have no viscosity after being aged at high temperature, and have very large filtration loss.
Drawings
FIG. 1 is a TEM scan of the spherical polymer treatment for drilling fluids obtained in example 1;
FIG. 2 is a TEM scan of the spherical polymer treating agent for drilling fluid obtained in example 2;
FIG. 3 is a TEM scan of the spherical polymer treatment for drilling fluid obtained in example 3;
FIG. 4 is an infrared spectrum of the spherical polymer treating agent for drilling fluid obtained in examples 1 to 3.
Detailed Description
The invention provides a spherical polymer treating agent for drilling fluid, which is prepared from the following raw materials in parts by mass:
the oil phase comprises white oil and an emulsifier, and the mass ratio of the emulsifier to the white oil is 3-5: 100;
the water phase comprises 2-acrylamido-2-methylpropanesulfonic acid, N-diethylacrylamide, methacrylic acid and acrylamide, and the mass ratio of the 2-acrylamido-2-methylpropanesulfonic acid to the N, N-diethylacrylamide to the methacrylic acid to the acrylamide is (30-40): 20-40): 10-20.
In the invention, the raw materials for preparing the spherical polymer treating agent for the drilling fluid comprise 40-56 parts of oil phase, preferably 43-53 parts, and more preferably 45-50 parts. In the invention, the oil phase comprises white oil and an emulsifier, the mass ratio of the emulsifier to the white oil is 3-5: 100, and in the embodiment of the invention, the mass ratio of the emulsifier to the white oil can be 3:100, 4:100 or 5: 100.
In the invention, the emulsifier preferably comprises span and oleic acid diethanolamide, and the mass ratio of span to oleic acid diethanolamide is preferably (40-50): 40-60), more preferably (42-48): 43-57), and most preferably (44-46): 48-53.
In the present invention, the emulsifier preferably further comprises fumed silica; the mass ratio of fumed silica to span is preferably (0, 10: 40, 50), more preferably [2, 8: 42,48], most preferably [4, 6: 44,46 ].
The raw materials for preparing the spherical polymer treating agent for the drilling fluid comprise 40-56 parts of water phase, preferably 43-53 parts, and more preferably 45-50 parts based on 40-56 parts of oil phase. In the present invention, the aqueous phase comprises 2-acrylamido-2-methylpropanesulfonic acid, N-diethylacrylamide, methacrylic acid, and acrylamide; the mass ratio of the 2-acrylamido-2-methylpropanesulfonic acid to the N, N-diethylacrylamide to the methacrylic acid to the acrylamide is (30-40) - (20-40) - (10-20), preferably (32-38) - (25-35) - (12-18), more preferably (34-36) - (28-32) - (14-16).
The raw materials for preparing the spherical polymer treating agent for the drilling fluid comprise 2-5 parts of an initiator by taking 40-56 parts of an oil phase as a reference, and in the embodiment of the invention, the initiator can be 2 parts, 3 parts, 4 parts or 5 parts by weight. In the invention, the initiator is preferably one or more of peroxide initiators and persulfates; the persulfate is preferably ammonium persulfate or potassium persulfate; the peroxide initiator is preferably benzoyl peroxide. In the present invention, when the initiator is preferably two or three of ammonium persulfate, benzoyl peroxide and persulfate, the addition amounts of the selected substances are preferably equal. In the present invention, the persulfate is preferably potassium persulfate and/or sodium persulfate.
The raw materials for preparing the spherical polymer treating agent for the drilling fluid comprise 2-5 parts of a cross-linking agent by taking 40-56 parts of an oil phase as a reference, and in the embodiment of the invention, the mass part of the cross-linking agent can be specifically 2 parts, 3 parts, 4 parts or 5 parts. In the invention, the cross-linking agent is preferably one or more of methylene bisacrylamide, N-hydroxyethyl acrylamide and diacetone acrylamide. In the present invention, when the crosslinking agent is preferably two or three of methylenebisacrylamide, N-hydroxyethyl acrylamide, and diacetone acrylamide, the addition amounts of the selected substances are preferably equal.
In the present invention, the source of all the above-mentioned raw materials is not particularly limited, and commercially available raw materials can be used.
The invention also provides a preparation method of the spherical polymer treating agent for the drilling fluid, which comprises the following steps:
mixing the oil phase and the water phase, and performing primary heating treatment to obtain an oil-water mixture;
mixing the oil-water mixture and an initiator to carry out secondary heating treatment to obtain a mixture containing the initiator;
and mixing the mixture containing the initiator and the cross-linking agent for polymerization reaction to obtain the spherical polymer treating agent for the drilling fluid.
The oil phase and the water phase are mixed and subjected to primary heating treatment to obtain an oil-water mixture. In the invention, the temperature of the primary heating treatment is preferably 40-50 ℃, more preferably 42-48 ℃, and most preferably 44-46 ℃; the time of the primary heating treatment is preferably 1 to 3 hours, and specifically may be 1 hour, 2 hours or 3 hours. In the invention, the primary heating treatment is carried out to obtain a preheated stable oil-water mixture system, and emulsion formed by oil-water mixing provides a 'spherical micro-reactor' for polymerization reaction, which is beneficial to the generation of spherical polymers.
In the invention, the primary heating treatment is preferably carried out under the condition of stirring, and the stirring speed is preferably 900-1100 rpm/min, more preferably 950-1050 rpm/min, and most preferably 980-1030 rpm/min.
After the oil-water mixture is obtained, the oil-water mixture and an initiator are mixed for secondary heating treatment to obtain a mixture containing the initiator. In the invention, the temperature of the secondary heating treatment is preferably 60-80 ℃, more preferably 65-75 ℃, and most preferably 68-73 ℃; the time of the secondary heating treatment is preferably 1 to 3 hours, and specifically may be 1 hour, 2 hours or 3 hours.
After the mixture containing the initiator is obtained, the mixture containing the initiator and the cross-linking agent are mixed for polymerization reaction, and the spherical polymer treating agent for the drilling fluid is obtained. In the invention, the temperature of the polymerization reaction is preferably 40-50 ℃, more preferably 42-48 ℃, and most preferably 44-46 ℃; the time of the polymerization reaction is preferably 4 to 5 hours.
The method selects a feeding mode of firstly adding the initiator and then adding the cross-linking agent, and firstly adds the initiator to generate active free radicals to initiate polymerization reaction; and adding a cross-linking agent to construct a spherical polymer core after the reaction is carried out to a certain stage, so as to enhance the structural stability.
The spherical polymer treating agent for drilling fluid, the preparation method thereof and the drilling fluid provided by the present invention are described in detail with reference to the following examples, but they should not be construed as limiting the scope of the present invention.
In the following examples, the parts are parts by mass unless otherwise specified.
Example 1
12.5g of span 80, 10g of oleic diethanolamide and 2.5g of fumed silica are mixed to obtain an emulsifier, 500g of white oil and 25g of emulsifier are mixed to obtain an oil phase.
196.875g of 2-acrylamido-2-methylpropanesulfonic acid, 262.5g of N, N-diethylacrylamide, 131.25g of methacrylic acid and 65.625g of acrylamide were mixed to obtain an aqueous phase.
32.8125g of ammonium persulfate and 32.8125g of sodium persulfate were mixed to obtain an initiator.
65.625g of diacetone acrylamide are weighed out as crosslinking agent.
Mixing the oil phase and the water phase, and heating at 40 deg.C for 1.5 hr to obtain oil-water mixture;
mixing the oil-water mixture with an initiator, and heating at 60 ℃ for 2 hours to obtain a mixture containing the initiator;
and mixing the mixture including the initiator and the cross-linking agent, and polymerizing for 5 hours at 50 ℃ to obtain the spherical polymer treating agent for the drilling fluid.
Example 2
8g of span 80 and 12g of oleic acid diethanolamide are mixed to obtain an emulsifier, and 500g of white oil and 20g of emulsifier are mixed to obtain an oil phase.
148.56g of 2-acrylamido-2-methylpropanesulfonic acid, 148.56g of N, N-diethylacrylamide, 148.56g of methacrylic acid and 148.56g of acrylamide were mixed to obtain an aqueous phase.
18.57g of benzoyl peroxide were weighed out as initiator.
9.29g of methylenebisacrylamide and 9.29g of N-hydroxyethylacrylamide were mixed to obtain a crosslinking agent.
Mixing the oil phase and the water phase, and heating at 40 deg.C for 1.5 hr to obtain oil-water mixture;
mixing the oil-water mixture with an initiator, and heating at 80 ℃ for 2 hours to obtain a mixture containing the initiator;
and mixing the mixture including the initiator and the cross-linking agent, and polymerizing for 5 hours at 50 ℃ to obtain the spherical polymer treating agent for the drilling fluid.
Example 3
10g of span 80, 12.5g of oleic diethanolamide and 2.5g of fumed silica are mixed to obtain an emulsifier, 500g of white oil and 25g of emulsifier are mixed to obtain an oil phase.
220.5g of 2-acrylamido-2-methylpropanesulfonic acid, 147g of N, N-diethylacrylamide, 294g of methacrylic acid and 73.5g of acrylamide were mixed to obtain an aqueous phase.
13.125g of benzoyl peroxide and 13.125g of potassium persulfate were mixed to obtain an initiator.
13.125g of diacetone acrylamide and 13.125g of methylenebisacrylamide were used as crosslinking agents.
Mixing the oil phase and the water phase, and heating at 40 deg.C for 1.5 hr to obtain oil-water mixture;
mixing the oil-water mixture with an initiator, and heating at 70 ℃ for 2 hours to obtain a mixture containing the initiator;
and mixing the mixture containing the initiator and the crosslinking agent, and polymerizing for 4.5 hours at 50 ℃ to obtain the spherical polymer treating agent for the drilling fluid.
TEM scanning tests are respectively carried out on the spherical polymer treating agents for the drilling fluid obtained in the embodiments 1 to 3, and the test results are respectively shown in the figures 1 to 3. Wherein, fig. 1 is a TEM scan of the spherical polymer treating agent for drilling fluid obtained in example 1, fig. 2 is a TEM scan of the spherical polymer treating agent for drilling fluid obtained in example 2, and fig. 3 is a TEM scan of the spherical polymer treating agent for drilling fluid obtained in example 3. As can be seen from FIGS. 1 to 3, the spherical polymer treating agent for drilling fluid obtained by the present invention has a three-dimensional spherical appearance and a particle size distribution of 100 to 500 nm.
The infrared spectrum tests of the spherical polymer treating agents for the drilling fluid obtained in the embodiments 1 to 3 were respectively carried out, and the test results are respectively shown in fig. 4. ByAs can be seen from FIG. 4, the wave number is 3425cm-1The absorption peak at (A) is assigned to-NH2Middle N-H stretching vibration, 2925cm-1And the absorption peaks at 2854 are assigned to-CH2-、-CH3Extension and contraction vibration of 2185cm-1The absorption peak is C ═ C double bond in 2-acrylamido-2-methylpropanesulfonic acid, 1666cm-1The absorption peak at (b) is attributed to stretching vibration of a carbonyl group (C ═ O) in an amide group; 1554cm-1Is the amino absorption peak; 1455cm-1The absorption peak at (A) belongs to-CH2-flexural vibrations of the medium-C-H bond; 1410cm-1The absorption peak at (A) belongs to-CH2-、-CH3Bending vibration of the Medium-C-H bond, 1173cm-1And 1061cm-1The absorption peak of (A) belongs to-SO3Stretching vibrations of the S-O bond; 664cm-1Is the stretching vibration absorption peak of the-C-S bond. The infrared spectrum shows that the spherical polymer contains characteristic absorption peaks of various monomer structural units, and the copolymer is a designed product.
The invention respectively carries out the viscosity-uniformity relative molecular mass test on the spherical polymer treating agent for the drilling fluid obtained in the embodiment 1-3, and the test result shows that the polymer viscosity-uniformity relative molecular mass is 6 multiplied by 105～9×105In the meantime.
The performances of the spherical polymer treating agents for drilling fluid obtained in examples 1 to 3 in bentonite slurry were tested, and the results are shown in table 1.
Table 1 performance of the spherical polymer treatment agent for drilling fluid obtained in examples 1 to 3 in bentonite slurry.
As can be seen from table 1, the spherical polymer treating agent for drilling fluid obtained in embodiments 1 to 3 of the present invention has a slightly decreased viscosity and a slightly increased fluid loss after high temperature aging of bentonite slurry, while the common polyacrylamide and xanthan gum have no viscosity and no fluid loss reduction effect after high temperature aging.
The invention also tests the performances of the spherical polymer treating agent for the drilling fluid obtained in the embodiments 1-3 in a water-based drilling fluid system. Polyacrylamide, xanthan gum and the spherical polymer treating agent for drilling fluid of the present invention were added to the blank drilling fluid, and the performance was examined after aging at high temperature, with the results shown in table 2.
Table 2 Performance of the spherical Polymer treating agent for drilling fluid obtained in examples 1 to 3 in drilling fluid
Note: the standard fluid loss conditions are 25 ℃ and 0.7MPa, and the high-temperature and high-pressure fluid loss conditions are 150 ℃ and 3.5 MPa.
As can be seen from Table 2, when the spherical polymer treating agent for drilling fluid obtained in the embodiments 1 to 3 of the invention is added into the drilling fluid, the viscosity of the drilling fluid can be obviously maintained within a normal range, and the filtration loss is low; common polyacrylamide and xanthan gum have no viscosity after being aged at high temperature, and have very large filtration loss.
According to the above embodiments, the present invention provides a spherical polymer treatment agent for drilling fluid. The spherical polymer treating agent for the drilling fluid is prepared from the following raw materials in parts by mass: 40-56 parts of an oil phase; 40-56 parts of a water phase; 2-5 parts of an initiator; 2-5 parts of a cross-linking agent. The spherical polymer treating agent for the drilling fluid is three-dimensional spherical in appearance, and the particle size is 100-500 nm. From the experimental results of the embodiments 1 to 3, it can be seen that the spherical polymer treating agent for drilling fluid obtained by the present invention has a slightly reduced viscosity and a slightly increased fluid loss after high temperature aging of bentonite slurry, while the common polyacrylamide and xanthan gum have no viscosity and no fluid loss reduction effect after high temperature aging; the spherical polymer treating agent for the drilling fluid, which is obtained by the invention, can obviously maintain the viscosity of the drilling fluid in a normal range when added into the drilling fluid, and has low filtration loss; common polyacrylamide and xanthan gum have no viscosity after being aged at high temperature, and have very large filtration loss.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (9)
1. A spherical polymer treating agent for drilling fluid is prepared from the following raw materials in parts by mass:
the oil phase is white oil and an emulsifier, and the mass ratio of the emulsifier to the white oil is 3-5: 100;
the water phase comprises 2-acrylamido-2-methylpropanesulfonic acid, N-diethylacrylamide, methacrylic acid and acrylamide, and the mass ratio of the 2-acrylamido-2-methylpropanesulfonic acid to the N, N-diethylacrylamide to the methacrylic acid to the acrylamide is (30-40): 20-40): 10-20);
the spherical polymer treating agent for the drilling fluid is three-dimensional spheres in appearance, and the particle size is distributed in the range of 100-500 nm.
2. The spherical polymer treating agent for drilling fluid as claimed in claim 1, wherein the emulsifier comprises span and oleic acid diethanolamide, and the mass ratio of span to oleic acid diethanolamide is (40-50): 40-60).
3. The spherical polymer treating agent for drilling fluid according to claim 2, wherein the emulsifier further comprises fumed silica;
the mass ratio of the fumed silica to the span is (0, 10): 40,50 ].
4. The spherical polymer treating agent for the drilling fluid as claimed in claim 1, wherein the initiator is one or more of peroxide initiator and persulfate.
5. The spherical polymer treating agent for the drilling fluid as claimed in claim 1, wherein the cross-linking agent is one or more of methylene bisacrylamide, N-hydroxyethyl acrylamide and diacetone acrylamide.
6. The preparation method of the spherical polymer treating agent for the drilling fluid, which is described in any one of claims 1 to 5, comprises the following steps:
mixing the oil phase and the water phase, and performing primary heating treatment to obtain an oil-water mixture;
mixing the oil-water mixture and an initiator to carry out secondary heating treatment to obtain a mixture containing the initiator;
mixing the mixture containing the initiator and the cross-linking agent for polymerization reaction to obtain a spherical polymer treating agent for the drilling fluid;
the water phase is obtained by mixing 2-acrylamide-2-methylpropanesulfonic acid, N-diethylacrylamide, methacrylic acid and acrylamide.
7. The preparation method according to claim 6, wherein the temperature of the primary heating treatment is 40-50 ℃;
the time of the primary heating treatment is 1-3 hours.
8. The preparation method according to claim 6, wherein the temperature of the secondary heating treatment is 60-80 ℃;
the time of the secondary heating treatment is 1-3 hours.
9. The method according to claim 6, wherein the polymerization reaction temperature is 40 to 50 ℃;
the time of the polymerization reaction is 4-5 hours.
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