CN112111253A - Dispersant for water-based drilling fluid, preparation method and application thereof - Google Patents

Dispersant for water-based drilling fluid, preparation method and application thereof Download PDF

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CN112111253A
CN112111253A CN201910532178.3A CN201910532178A CN112111253A CN 112111253 A CN112111253 A CN 112111253A CN 201910532178 A CN201910532178 A CN 201910532178A CN 112111253 A CN112111253 A CN 112111253A
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acid
temperature
mixed solution
hours
initiator
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CN112111253B (en
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王海波
杨小华
金军斌
林永学
王琳
杨帆
李雄
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China Petroleum and Chemical Corp
Sinopec Research Institute of Petroleum Engineering
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Sinopec Research Institute of Petroleum Engineering
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    • 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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    • C08F120/00—Homopolymers 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
    • C08F120/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
    • C08F120/52—Amides or imides
    • C08F120/54—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide
    • C08F120/58—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide containing oxygen in addition to the carbonamido oxygen, e.g. N-methylolacrylamide, N-acryloyl morpholine
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Abstract

The application provides a dispersing agent, a preparation method and application thereof. The preparation method of the dispersant comprises the following steps: 1) adding acid into water under the condition of stirring, adding a catalyst after the temperature reaches a first temperature, and carrying out catalytic reaction to obtain a mixed solution A; 2) sequentially adding organic acid anhydride and sulfonic acid containing vinyl into the mixed solution A under the stirring condition, dissolving the organic acid anhydride and the sulfonic acid containing vinyl at a second temperature, and introducing nitrogen to obtain mixed solution B; 3) adding an initiator into the mixed solution B at a third temperature under the stirring condition, slowing down the stirring speed after the initiator is dissolved, and carrying out polymerization reaction to obtain a gel product; 4) and drying, crushing and sieving the gel product at a fourth temperature to obtain the dry powder dispersing agent.

Description

Dispersant for water-based drilling fluid, preparation method and application thereof
Technical Field
The application provides a preparation method of a dispersant for water-based drilling fluid, in particular to a dispersant for drilling fluid.
Background
With the increasing world energy demand, the drilling target gradually turns to the deep stratum, and the probability of drilling the ultra-high temperature and high pressure stratum is higher in the drilling process of the deep stratum. For example, in the United states, the North China sea oil field and other areas, the bottom hole temperature is usually over 200 ℃, the average ground temperature gradient is up to 4.0 ℃/100m, the bottom hole maximum pressure is over 110MPa, and the drilling fluid density during drilling is up to 2.22g/cm3The above; in the Chojia enclosure area in Daqing, the bottom temperature is above 180 ℃, the highest temperature can reach 240 ℃, and the ground temperature gradient can reach 4.1 ℃/100 m; in the domestic south China sea Oringahling basin, the ground temperature gradient is high, the formation pressure is abnormally high, the maximum temperature of the bottom of a drilled well reaches 249 ℃, and the maximum drilling fluid density is 2.14g/cm3。
In the deep ultra-high temperature and high pressure stratum environment, the drilling fluid generally has the problems of poor rheological property, difficult regulation, barite settlement and the like, so that the underground complex occurrence is caused. The reasons include two points: firstly, the drilling fluid is in a high-temperature condition for a long time, so that clay, drill cuttings and the like in the drilling fluid are dispersed at high temperature, the high-temperature thickening of the drilling fluid is promoted, the viscosity of the drilling fluid is increased, and the rheological property is poor. Secondly, the high-density drilling fluid system means that a large amount of weighting solid phase needs to be added, free water in the system is contended with other treating agents, the high-temperature thickening condition is aggravated, and meanwhile, the viscosity of the system is further increased due to the friction force between solid phase particles.
The effective way for solving the problems is to add a dispersing agent, which is one of the drilling fluid core treating agents and mainly has the functions of breaking up the grid structure among particles in the drilling fluid system and reducing the structural viscosity of the system. The dispersing agent is an ultrahigh-temperature high-density drilling fluid technology as a core element, and has extremely important significance for safely drilling deep ultrahigh-temperature high-pressure stratum, improving drilling speed, reducing cost and improving efficiency.
In recent years, a great deal of research is carried out in China on dispersants suitable for ultrahigh-temperature drilling fluid and ultrahigh-density drilling fluid, and important types comprise lignin, humic acid, organophosphine and organosilicon. Their main role is to reduce the viscosity rise due to clay particles and finely divided solids, and to have limited effect on viscosity rise due to the addition of too much heavy solids in ultra-high density drilling fluids. Meanwhile, the molecules of the treating agent generate radical variation and conformation damage under the condition of ultrahigh temperature, even main chain breakage occurs, and in order to avoid the viscosity of the drilling fluid system from rising again, new dispersing agent needs to be continuously added in use, so that the cost of field construction is increased.
Disclosure of Invention
In order to solve the problems in the prior art, the invention discloses a novel dispersant for water-based drilling fluid and a preparation method thereof, and the product is completely different from the existing lignin dispersant, humic acid dispersant, organic phosphine dispersant and organic silicon dispersant. The dispersant prepared by the method can be used at a high temperature of 220 ℃ and 2.2g/cm3Reduced viscosity rise in high density systems due to clay particles and finely dispersed solids, and viscosity rise due to low free water in high density drilling fluids and high internal friction of solid weighting materials. Meanwhile, the product can provide a long-acting viscosity reduction effect, the viscosity of the drilling fluid is kept in a reasonable range for a long time, and the construction cost is greatly reduced.
Specifically, one of the present invention provides a method for preparing a dispersant, comprising the steps of:
1) obtaining a mixed solution A containing acid and catalyst;
2) obtaining a mixed solution B containing the mixed solution A, organic acid anhydride and vinyl-containing sulfonic acid;
3) and carrying out polymerization reaction on the mixed solution B under the action of an initiator to obtain a gel product containing the dispersing agent.
In a specific embodiment, in step 1), adding an acid into water under stirring conditions, adding a catalyst after the temperature reaches a first temperature, and performing a catalytic reaction to obtain a mixed solution a;
in the step 2), adding the organic acid anhydride and the vinyl-containing sulfonic acid into the mixed solution A under stirring (for example, sequentially adding the organic acid anhydride and the vinyl-containing sulfonic acid into the mixed solution A), dissolving the organic acid anhydride and the vinyl-containing sulfonic acid at a second temperature, and introducing nitrogen to obtain a mixed solution B;
in the step 3), adding an initiator into the mixed solution B at a third temperature under the stirring condition, slowing down the stirring speed after the initiator is dissolved, and carrying out polymerization reaction to obtain a gel-like product.
In a particular embodiment, the method further comprises, after step 3), step 4): and drying, crushing and sieving the gel product at a fourth temperature to obtain the dry powder dispersing agent.
In one embodiment, in step 4), after pulverization, a 16 to 30 mesh sieve may be passed. For example, 20 mesh.
In one embodiment, the stirring conditions in step 1) may be such that the stirring is maintained while the acid is added, during the time the temperature reaches the first temperature, and during the time the catalytic reaction is carried out. Wherein the stirring speed can be 200r/min to 400 r/min; or further, the stirring speed can be 250r/min to 350r/min, for example, the stirring speed can be controlled to 300 r/min.
In one embodiment, the organic acid anhydride and the vinyl-containing sulfonic acid are added to the mixed solution a at the first temperature without lowering the temperature in step 2). The stirring condition in the step 2) may be such that the stirring state is maintained during the process of bringing the temperature to the second temperature and the process of introducing nitrogen gas while adding the organic acid anhydride and the vinyl-containing sulfonic acid. Wherein the stirring speed can be 200r/min to 400 r/min; or further, the stirring speed can be 250r/min to 350r/min, for example, the stirring speed can be controlled to 300 r/min. In addition, the order of addition of the organic acid anhydride and the vinyl-containing sulfonic acid is not particularly limited, but it is preferable to add them separately.
In one embodiment, the stirring speed before the initiator is dissolved in the step 3) can be 200r/min to 400 r/min; or further, the stirring speed can be 250r/min to 350r/min, for example, the stirring speed can be controlled to 300 r/min. After the initiator is dissolved, the stirring speed can be reduced to 150 to 200 r/min.
In one embodiment, the acid is present in an amount of 44% to 70%, the catalyst is present in an amount of 0.1% to 1%, the organic anhydride is present in an amount of 20% to 45%, and the vinyl-containing sulfonic acid is present in an amount of 1% to 10%, based on 100% by mass of the total of the acid, catalyst, organic anhydride, and vinyl-containing sulfonic acid.
In one embodiment, the acid is present in an amount of 50% to 60%, the catalyst is present in an amount of 0.5% to 1%, the organic anhydride is present in an amount of 35% to 44%, and the vinyl-containing sulfonic acid is present in an amount of 4.5% to 5%.
In one embodiment, the initiator is used in an amount of 0.1% to 0.7% by mass of the total mass of the acid, the organic anhydride and the vinyl-containing sulfonic acid monomer.
In one embodiment, the initiator is preferably used in an amount of 0.3% to 0.5% by mass of the total mass of the acid, the organic anhydride and the vinyl-containing sulfonic acid monomer.
In a specific embodiment, the mass ratio of the water to the acid is from 3:10 to 3: 11.
In a particular embodiment, the acid comprises a compound selected from glacial acetic acid and/or phosphorous acid.
In one embodiment, the acid is a mixture of glacial acetic acid and phosphorous acid, and the mass ratio of glacial acetic acid to phosphorous acid is 0.28-0.4: 1.
In one embodiment, the organic acid anhydride comprises at least one selected from succinic anhydride, phthalic anhydride, benzoic anhydride.
In one embodiment, the vinyl-containing sulfonic acid comprises 2-acrylamido-2-methylpropanesulfonic acid and/or 2-acryloxy-2-methylpropanesulfonic acid.
In one embodiment, the catalyst comprises tetrabutylammonium bromide and/or Al2O3。
In one embodiment, the initiator comprises at least one selected from the group consisting of ammonium persulfate, potassium persulfate, azobisisobutyramidine hydrochloride, and azobisisobutyramidine hydrochloride. For example, the initiator includes azobisisobutyrimidazoline hydrochloride and/or azobisisobutyramidine hydrochloride. The azobisisobutyrimidazoline hydrochloride can be, for example, VA-044; the azobisisobutyramidine hydrochloride may be, for example, V-50.
In a specific embodiment, the first temperature and the second temperature are independently 60 to 90 ℃.
In one embodiment, the third temperature is 40 to 75 ℃.
In one embodiment, the fourth temperature is from 70 to 110 ℃.
In one embodiment, the first temperature is 70 to 80 ℃.
In one embodiment, the second temperature is 60 to 75 deg.C
In one embodiment, the third temperature is 55 to 60 ℃.
In one embodiment, in step 1), the time of the catalytic reaction is 1 to 5 hours.
In one embodiment, in step 1), the time of the catalytic reaction is 1 to 2 hours.
In one embodiment, in step 2), the nitrogen is introduced for a period of 0.5 to 2 hours.
In one embodiment, in step 2), the nitrogen is introduced for a period of 1 to 1.5 hours.
In one embodiment, in step 3), the time of the polymerization reaction is 0.5 to 4 hours.
In one embodiment, in step 3), the time of the polymerization reaction is 1 to 2 hours.
In a specific embodiment, in step 4), the drying time is 24 to 30 hours.
The second invention provides a dispersant prepared by the preparation method of any one of the first invention.
The third invention provides application of the dispersant prepared by the preparation method in drilling fluid.
Detailed Description
The present invention is further illustrated by the following examples, which are intended to be purely exemplary of the invention and are not to be construed as limiting the invention in any way.
Glacial acetic acid: beijing Jie Olympic technologies, Inc.
Phosphorous acid: corridor, Peng color Fine chemical Co., Ltd.
Al2O3: chemical agents corporation, national drug group.
Tetrabutylammonium bromide: chemical agents corporation, national drug group.
2-acrylamido-2-methylpropanesulfonic acid: shouguangrude chemical Co., Ltd.
2-acryloyloxy-2-methylpropanesulfonic acid: shanghai Lingfeng Chemicals, Inc.
Phthalic anhydride: shanghai Guo research science and technology, Inc.
Succinic anhydride: hubei Jusheng science and technology Co.
Initiator V-50: qingdao Koxin New Material science and technology, Inc.
Initiator V-044: qingdao Koxin New Material science and technology, Inc.
Sodium carbonate: chemical agents corporation, national drug group.
Bentonite: bohai drilling mud Corp.
Barite: sichuan Huaxi mining Co., Ltd, density 4.2g/cm3。
Commercial dispersant a: turpan is a firm of Industrial trade, Inc.
Commercially available dispersant B: victory oil field and petroleum technology limited.
The high-density drilling fluid base slurry used in each example has the same formula, and the formula of the high-density drilling fluid base slurry is as follows:
300mL of distilled water was measured and placed in a cup, 0.42g of anhydrous sodium carbonate and 12.0g of bentonite (weighed to 0.01g) were added, and stirring was carried out at high speed for 20min, at least twice during which, to scrape the bentonite adhering to the container wall, after curing was carried out at 25 ℃ for 24h, 756g of barite was added with high speed stirring, then stirring was continued for 10min with high speed, and the base slurry Φ 100 reading was measured with a six-speed rotational viscometer.
And (3) viscosity reduction rate effect evaluation: taking six parts of weighted base slurry, taking one part of base slurry as a blank sample at normal temperature, stirring for 10min at a high speed, and measuring the reading phi of 100 revolutions by using a six-speed rotational viscosity meter100(1)(ii) a 4.8g of the dispersant sample prepared in each example was added to the second portion of the base slurry with stirring by a glass rod, and then stirred at high speed for 10min before measuring 100 revolutions and reading phi100(2)(ii) a Stirring the third base slurry at high speed for 10min, placing in a roller heating furnace, rolling at 220 deg.C for 16h, cooling to 25 deg.C, stirring at high speed for 5min, and measuring the reading phi of 100 revolutions100(3)(ii) a Adding 4.8g of the dispersant sample prepared in each example into the fourth base slurry under the stirring of a glass rod, then stirring at a high speed for 10min, putting into a roller heating furnace, rolling for 16h at 220 ℃, cooling to 25 ℃, stirring at a high speed for 5min, and measuring the reading phi of 100 revolutions100(4). Stirring the fifth base slurry at a high speed for 10min, placing the fifth base slurry into a roller heating furnace, rolling the fifth base slurry at 220 ℃ for 48h, cooling the fifth base slurry to 25 ℃, stirring the fifth base slurry at a high speed for 5min, and measuring the reading phi of 100 revolutions100(5)(ii) a Adding 4.8g of the dispersant sample prepared in each example into the sixth base slurry under the stirring of a glass rod, stirring at a high speed for 10min, putting into a roller heating furnace, rolling at 220 ℃ for 48h, cooling to 25 ℃, stirring at a high speed for 5min, and measuring the reading phi of 100 revolutions100(6). The viscosity reduction rate of the dispersant prepared in each example was calculated according to the formula (1), the formula (2) and the formula (3) at room temperature, after aging at 220 ℃/16h and after aging at 220 ℃/48 h.
Figure BDA0002100099160000051
Figure BDA0002100099160000052
Figure BDA0002100099160000053
In the formula:
P1the normal temperature viscosity reduction rate is percent;
P2viscosity reduction rate after aging at 220 ℃/16h is percent;
P3viscosity reduction rate after aging at 220 ℃/48h,%;
Ф100(1)reading the normal temperature base slurry at 100 r/min;
Ф100(2)reading the normal temperature base slurry at 100r/min after sample adding;
Ф100(3)-a reading of 100r/min at 220 ℃/16h base stock;
Ф100(4)after sample loading, reading the base slurry at 220 ℃/16h for 100 r/min;
Ф100(5)-a reading of 100r/min at 220 ℃/48h base stock;
Ф100(6)after sample application, a reading of 100r/min of 220 ℃/48h of base slurry.
Example 1
1. Preparation of ultra-high temperature high density drilling fluid dispersant
(1) Under the stirring condition of 300r/min, 12g phosphorous acid and 43g glacial acetic acid are dissolved in 15g water, the temperature is raised to 72 ℃, and 0.5g Al is added2O3The reaction was continued for 1.5 hours to obtain a mixture A.
(2) Under the stirring condition of 300r/min, 39.5g of succinic anhydride and 4.5g of 2-acrylamido-2-methylpropanesulfonic acid are sequentially added into the mixed solution A, the temperature is kept at 72 ℃, nitrogen is introduced for reaction for 1.5 hours after the mixed solution is dissolved uniformly, and mixed solution B is obtained.
(3) Under the stirring condition of 300r/min, 0.4g of initiator V-044 is added into the mixed solution B at 60 ℃, the stirring speed is slowed down to 200r/min after the initiator is dissolved, and the polymerization reaction is carried out for 1 hour.
(4) And drying, crushing and sieving the obtained product with a 20-mesh sieve to obtain the ultrahigh-temperature high-density drilling fluid system dispersant. The drying temperature was 105 ℃ and the drying time was 24 hours.
2. Evaluation of viscosity reduction Effect
The results are shown in Table 1.
Example 2
1. Preparation of ultra-high temperature high density drilling fluid dispersant
(1) Under the stirring condition of 300r/min, 14.17g phosphorous acid and 50.83g glacial acetic acid are dissolved in 19g water, the temperature is raised to 65 ℃, and 0.2g Al is added2O3After that, the reaction was carried out for 4 hours to obtain a mixed solution A.
(2) Under the stirring condition of 300r/min, sequentially adding 30g of succinic anhydride and 4g of 2-acrylamide-2-methylpropanesulfonic acid into the mixed solution A, keeping the temperature at 80 ℃, and introducing nitrogen for reacting for 0.5 hour after dissolving uniformly to obtain mixed solution B.
(3) Under the stirring condition of 300r/min, 0.6g of initiator V-044 is added into the mixed solution B at 40 ℃, the stirring speed is slowed down to 200r/min after the initiator is dissolved, and the polymerization reaction is carried out for 3 hours.
(4) And drying, crushing and sieving the obtained product with a 20-mesh sieve to obtain the ultrahigh-temperature high-density drilling fluid system dispersant. The drying temperature was 70 ℃ and the drying time was 30 hours.
2. Evaluation of viscosity reduction Effect
The results are shown in Table 1.
Example 3
1. Preparation of ultra-high temperature high density drilling fluid dispersant
(1) Under the stirring condition of 300r/min, 12g of phosphorous acid and 43g of glacial acetic acid are dissolved in 15g of water, the temperature is raised to 75 ℃, 0.5g of tetrabutylammonium bromide is added for reaction for 1.5 hours, and mixed liquid A is obtained.
(2) And under the stirring condition of 300r/min, sequentially adding 39.5g of phthalic anhydride and 4.5g of 2-acryloyloxy-2-methylpropanesulfonic acid into the mixed solution A, keeping the temperature at 72 ℃, and introducing nitrogen for reacting for 1.5 hours after the mixed solution is dissolved uniformly to obtain mixed solution B.
(3) And adding 0.3g of initiator V-50 into the mixed solution B at 60 ℃ under the stirring condition of 300r/min, slowing down the stirring speed to 200r/min after the initiator is dissolved, and carrying out polymerization reaction for 1 hour.
(4) And drying, crushing and sieving the obtained product with a 20-mesh sieve to obtain the ultrahigh-temperature high-density drilling fluid system dispersant. The drying temperature was 105 ℃ and the drying time was 24 hours.
2. Evaluation of viscosity reduction Effect
The results are shown in Table 1.
Example 4
1. Preparation of ultra-high temperature high density drilling fluid dispersant
(1) Under the stirring condition of 300r/min, 14.17g phosphorous acid and 50.83g glacial acetic acid are dissolved in 19g water, the temperature is raised to 65 ℃, 0.2g tetrabutylammonium bromide is added for reaction for 4 hours, and a mixed solution A is obtained.
(2) Under the stirring condition of 300r/min, 30g of phthalic anhydride and 4g of 2-acryloyloxy-2-methylpropanesulfonic acid are sequentially added into the mixed solution A, the temperature is kept at 80 ℃, nitrogen is introduced for reaction for 0.5 hour after the mixed solution A is dissolved uniformly, and mixed solution B is obtained.
(3) Under the stirring condition of 300r/min, 0.6g of initiator V-50 is added into the mixed solution B at 40 ℃, the stirring speed is slowed down to 200r/min after the initiator is dissolved, and the polymerization reaction is carried out for 3 hours.
(4) And drying, crushing and sieving the obtained product with a 20-mesh sieve to obtain the ultrahigh-temperature high-density drilling fluid system dispersant. The drying temperature was 70 ℃ and the drying time was 30 hours.
2. Evaluation of viscosity reduction Effect
The results are shown in Table 1.
Example 5
1. Preparation of ultra-high temperature high density drilling fluid dispersant
(1) 9.81g phosphorous acid and 35.19g glacial acetic acid are dissolved in 12.29g water with stirring at 300r/min, the temperature is raised to 60 ℃, 1g Al is added2O3After that, the reaction was carried out for 1 hour to obtain a mixed solution A.
(2) Under the stirring condition of 300r/min, 44g succinic anhydride and 10g 2-acrylamide-2-methyl propanesulfonic acid are sequentially added into the mixed solution A, the temperature is kept at 60 ℃, nitrogen is introduced for reaction for 0.5 hour after the mixed solution A is dissolved uniformly, and mixed solution B is obtained.
(3) Under the stirring condition of 300r/min, 0.1g of initiator V-044 is added into the mixed solution B at 40 ℃, the stirring speed is slowed down to 200r/min after the initiator is dissolved, and the polymerization reaction is carried out for 0.5 hour.
(4) And drying, crushing and sieving the obtained product with a 20-mesh sieve to obtain the ultrahigh-temperature high-density drilling fluid system dispersant. The drying temperature was 70 ℃ and the drying time was 30 hours.
2. Evaluation of viscosity reduction Effect
The results are shown in Table 1.
Example 6
1. Preparation of ultra-high temperature high density drilling fluid dispersant
(1) 9.59g phosphorous acid and 34.41g glacial acetic acid were dissolved in 13.2g water under stirring at 300r/min, the temperature was raised to 60 ℃, 1g tetrabutylammonium bromide was added thereto and the reaction was carried out for 1 hour to obtain a mixed solution A.
(2) Under the stirring condition of 300r/min, 45g of succinic anhydride and 10g of 2-acrylamide-2-methylpropanesulfonic acid are sequentially added into the mixed solution A, the temperature is kept at 60 ℃, and nitrogen is introduced for reaction for 0.5 hour after the mixed solution is dissolved uniformly, so that mixed solution B is obtained.
(3) Under the stirring condition of 300r/min, 0.1g of initiator V-044 is added into the mixed solution B at 40 ℃, the stirring speed is slowed down to 200r/min after the initiator is dissolved, and the polymerization reaction is carried out for 0.5 hour.
(4) And drying, crushing and sieving the obtained product with a 20-mesh sieve to obtain the ultrahigh-temperature high-density drilling fluid system dispersant. The drying temperature was 70 ℃ and the drying time was 30 hours.
2. Evaluation of viscosity reduction Effect
The results are shown in Table 1.
Example 7
1. Preparation of ultra-high temperature high density drilling fluid dispersant
(1) Under the stirring condition of 300r/min, 15.26g phosphorous acid and 54.74g glacial acetic acid are dissolved in 19.11g water, the temperature is raised to 90 ℃, and 0.1g Al is added2O3After that, the reaction was carried out for 5 hours to obtain a mixed solution A.
(2) Under the stirring condition of 300r/min, 20g of phthalic anhydride and 9.9g of 2-acryloyloxy-2-methylpropanesulfonic acid are sequentially added into the mixed solution A, the temperature is kept at 90 ℃, nitrogen is introduced for reacting for 2 hours after the mixed solution is dissolved uniformly, and mixed solution B is obtained.
(3) Under the stirring condition of 300r/min, 0.7g of initiator V-50 is added into the mixed solution B at the temperature of 75 ℃, the stirring speed is slowed down to 200r/min after the initiator is dissolved, and the polymerization reaction is carried out for 4 hours.
(4) And drying, crushing and sieving the obtained product with a 20-mesh sieve to obtain the ultrahigh-temperature high-density drilling fluid system dispersant. The drying temperature was 110 ℃ and the drying time was 24 hours.
2. Evaluation of viscosity reduction Effect
The results are shown in Table 1.
Example 8
1. Preparation of ultra-high temperature high density drilling fluid dispersant
(1) Under the stirring condition of 300r/min, 15.26g phosphorous acid and 54.74g glacial acetic acid are dissolved in 21g water, the temperature is raised to 90 ℃, and 1g Al is added2O3After that, the reaction was carried out for 5 hours to obtain a mixed solution A.
(2) Under the stirring condition of 300r/min, 28g of phthalic anhydride and 1g of 2-acrylamide-2-methylpropanesulfonic acid are sequentially added into the mixed solution A, the temperature is kept at 90 ℃, and nitrogen is introduced for reacting for 2 hours after the mixed solution is dissolved uniformly, so that mixed solution B is obtained.
(3) Under the stirring condition of 300r/min, 0.1g of initiator V-044 is added into the mixed solution B at 75 ℃, the stirring speed is slowed down to 200r/min after the initiator is dissolved, and the polymerization reaction is carried out for 4 hours.
(4) And drying, crushing and sieving the obtained product with a 20-mesh sieve to obtain the ultrahigh-temperature high-density drilling fluid system dispersant. The drying temperature was 110 ℃ and the drying time was 24 hours.
2. Evaluation of viscosity reduction Effect
The results are shown in Table 1.
Example 9
1. Preparation of ultra-high temperature high density drilling fluid dispersant
(1) Under the stirring condition of 300r/min, 12g phosphorous acid and 43g glacial acetic acid are dissolved in 15g water, the temperature is raised to 72 ℃, and 0.3g Al is added2O3The reaction was continued for 1.5 hours to obtain a mixture A.
(2) Under the stirring condition of 300r/min, 39.5g of succinic anhydride and 4.5g of 2-acrylamido-2-methylpropanesulfonic acid are sequentially added into the mixed solution A, the temperature is kept at 72 ℃, nitrogen is introduced for reaction for 1.5 hours after the mixed solution is dissolved uniformly, and mixed solution B is obtained.
(3) Under the stirring condition of 300r/min, 0.7g of initiator V-044 is added into the mixed solution B at 60 ℃, the stirring speed is slowed down to 200r/min after the initiator is dissolved, and the polymerization reaction is carried out for 1 hour.
(4) And drying and crushing the obtained product to obtain the ultra-high temperature high density drilling fluid system dispersant. The drying temperature was 105 ℃ and the drying time was 24 hours.
2. Evaluation of viscosity reduction Effect
The results are shown in Table 1.
Example 10
1. Preparation of ultra-high temperature high density drilling fluid dispersant
(1) Under the stirring condition of 300r/min, 12g of phosphorous acid and 43g of glacial acetic acid are dissolved in 15g of water, the temperature is raised to 72 ℃, 0.3g of tetrabutylammonium bromide is added for reaction for 1.5 hours, and mixed liquid A is obtained.
(2) Under the stirring condition of 300r/min, 39.5g of succinic anhydride and 4.5g of 2-acrylamido-2-methylpropanesulfonic acid are sequentially added into the mixed solution A, the temperature is kept at 72 ℃, nitrogen is introduced for reaction for 1.5 hours after the mixed solution is dissolved uniformly, and mixed solution B is obtained.
(3) Under the stirring condition of 300r/min, 0.7g of initiator V-50 is added into the mixed solution B at the temperature of 60 ℃, the stirring speed is slowed down to 200r/min after the initiator is dissolved, and the polymerization reaction is carried out for 1 hour.
(4) And drying and crushing the obtained product to obtain the ultra-high temperature high density drilling fluid system dispersant. The drying temperature was 105 ℃ and the drying time was 24 hours.
2. Evaluation of viscosity reduction Effect
The results are shown in Table 1.
Example 11
1. Preparation of ultra-high temperature high density drilling fluid dispersant
(1) Under the stirring condition of 300r/min, 11.5g phosphorous acid and 38.5g glacial acetic acid are dissolved in 15g water, the temperature is raised to 72 ℃, 0.2g tetrabutylammonium bromide is added for reaction for 1.5 hours, and mixed liquid A is obtained.
(2) Under the stirring condition of 300r/min, 37.5g of phthalic anhydride and 4.5g of 2-acrylamido-2-methylpropanesulfonic acid are sequentially added into the mixed solution A, the temperature is kept at 72 ℃, nitrogen is introduced for reaction for 1.5 hours after the mixed solution A is dissolved uniformly, and mixed solution B is obtained.
(3) Under the stirring condition of 300r/min, 0.6g of initiator V-044 is added into the mixed solution B at 60 ℃, the stirring speed is slowed down after the initiator is dissolved, and the polymerization reaction is carried out for 1 hour.
(4) And drying and crushing the obtained product to obtain the ultra-high temperature high density drilling fluid system dispersant. The drying temperature was 105 ℃ and the drying time was 24 hours.
2. Evaluation of viscosity reduction Effect
The results are shown in Table 1.
Example 12
1. Preparation of ultra-high temperature high density drilling fluid dispersant
(1) Under the stirring condition of 300r/min, 11.5g phosphorous acid and 38.5g glacial acetic acid are dissolved in 15g water, the temperature is raised to 72 ℃, 0.2g tetrabutylammonium bromide is added for reaction for 1.5 hours, and mixed liquid A is obtained.
(2) Under the stirring condition of 300r/min, 37.5g of phthalic anhydride and 4.5g of 2-acrylamido-2-methylpropanesulfonic acid are sequentially added into the mixed solution A, the temperature is kept at 72 ℃, nitrogen is introduced for reaction for 1.5 hours after the mixed solution A is dissolved uniformly, and mixed solution B is obtained.
(3) Under the stirring condition of 300r/min, 0.6g of initiator V-50 is added into the mixed solution B at the temperature of 60 ℃, the stirring speed is slowed down after the initiator is dissolved, and the polymerization reaction is carried out for 1 hour.
(4) And drying and crushing the obtained product to obtain the ultra-high temperature high density drilling fluid system dispersant. The drying temperature was 70 ℃ and the drying time was 24 hours.
2. Evaluation of viscosity reduction Effect
The results are shown in Table 1.
Example 13
1. Preparation of ultra-high temperature high density drilling fluid dispersant
(1) Under the stirring condition of 300r/min, 14.12g of phosphorous acid and 35.88g of glacial acetic acid are dissolved in 13.63g of water, the temperature is raised to 80 ℃, 1g of tetrabutylammonium bromide is added for reaction for 2 hours, and a mixed solution A is obtained.
(2) Under the stirring condition of 300r/min, 44g succinic anhydride and 5g 2-acrylamide-2-methyl propanesulfonic acid are sequentially added into the mixed solution A, the temperature is kept at 75 ℃, nitrogen is introduced for reaction for 1.5 hours after the mixed solution A is dissolved uniformly, and mixed solution B is obtained.
(3) Under the stirring condition of 300r/min, 0.5g of initiator V-50 is added into the mixed solution B at the temperature of 55 ℃, the stirring speed is slowed down to 200r/min after the initiator is dissolved, and the polymerization reaction is carried out for 2 hours.
(4) And drying, crushing and sieving the obtained product with a 20-mesh sieve to obtain the ultrahigh-temperature high-density drilling fluid system dispersant. The drying temperature was 110 ℃ and the drying time was 24 hours.
2. Evaluation of viscosity reduction Effect
The results are shown in Table 1.
Example 14
1. Preparation of ultra-high temperature high density drilling fluid dispersant
(1) Under stirring at 300r/min, 17g phosphorous acid and 43g glacial acetic acid were dissolved in 18g water, the temperature was raised to 70 ℃, 0.5g Al was added2O3After that, the reaction was carried out for 1 hour to obtain a mixed solution A.
(2) Under the stirring condition of 300r/min, 35g of succinic anhydride and 4.5g of 2-acrylamido-2-methylpropanesulfonic acid are sequentially added into the mixed solution A, the temperature is kept at 60 ℃, nitrogen is introduced for reaction for 1 hour after the mixed solution is dissolved uniformly, and mixed solution B is obtained.
(3) Under the stirring condition of 300r/min, 0.3g of initiator V-044 is added into the mixed solution B at 60 ℃, the stirring speed is slowed down to 200r/min after the initiator is dissolved, and the polymerization reaction is carried out for 1 hour.
(4) And drying, crushing and sieving the obtained product with a 20-mesh sieve to obtain the ultrahigh-temperature high-density drilling fluid system dispersant. The drying temperature was 70 ℃ and the drying time was 30 hours.
2. Evaluation of viscosity reduction Effect
The results are shown in Table 1.
Comparative example 1
The viscosity reducing effect of the commercially available dispersant A was evaluated. The results are shown in Table 1.
Comparative example 2
The viscosity reducing effect of the commercially available dispersant B was evaluated. The results are shown in Table 1.
TABLE 1 evaluation results of viscosity reduction ratio in examples
Figure BDA0002100099160000111
As can be seen from experimental data, after the dispersant for the drilling fluid is added, the content of the dispersant is 2.20g/cm3The reading of the drilling fluid base slurry is greatly reduced at 100 revolutions, the viscosity reduction rate can reach 83.5 percent at most, and the viscosity reduction rate is higher than that of the conventional commercially available dispersants A and B. After rolling aging at 220 ℃ for 16h, the highest viscosity reduction rate of the dispersant for the drilling fluid added in the invention is still more than 60%, which shows that the dispersant has good dispersion effect on the high-density solid-phase weighting agent at ultrahigh temperature. And after the conventional dispersants A and B sold in the market are subjected to rolling aging at 220 ℃ for 16 hours, the viscosity reduction rate is reduced in response, and even no effect is generated, which indicates that the two dispersants are partially decomposed or completely decomposed after being subjected to rolling aging at 220 ℃ for 16 hours. After rolling aging at 220 ℃ for 48 hours, the dispersant for drilling fluid added in the invention still has higher viscosity reduction and dispersion capability, which shows that the dispersant has long-acting viscosity reduction effect, and in actual construction, the rheological property of the drilling fluid can be ensured to be stable for a long time without frequent addition, and the construction cost can be greatly reduced. Both conventional commercial dispersants did not have any viscosity reducing effect after 48h at 220 ℃.
While the present application has been described with reference to specific embodiments, those skilled in the art will appreciate that various changes can be made without departing from the true spirit and scope of the present application. In addition, many modifications may be made to adapt a particular situation, material, composition of matter, and method to the objective, spirit and scope of the present application. All such modifications are intended to be included within the scope of the claims of this application.

Claims (10)

1. A method of making a dispersant, comprising the steps of:
1) obtaining a mixed solution A containing acid and catalyst;
2) obtaining a mixed solution B containing the mixed solution A, organic acid anhydride and vinyl-containing sulfonic acid;
3) and carrying out polymerization reaction on the mixed solution B under the action of an initiator to obtain a gel product containing the dispersing agent.
2. The preparation method according to claim 1, wherein in step 1), acid is added into water under stirring to reach a first temperature, and then a catalyst is added to perform a catalytic reaction to obtain a mixed solution A;
in the step 2), adding organic acid anhydride and vinyl-containing sulfonic acid into the mixed solution A under the stirring condition, dissolving the organic acid anhydride and the vinyl-containing sulfonic acid at a second temperature, and introducing nitrogen to obtain a mixed solution B;
in the step 3), adding an initiator into the mixed solution B at a third temperature under the stirring condition, slowing down the stirring speed after the initiator is dissolved, and carrying out polymerization reaction to obtain a gel-like product;
preferably, the method further comprises step 4) after step 3): and drying, crushing and sieving the gel product at a fourth temperature to obtain the dry powder dispersing agent.
3. The production method according to claim 1 or 2, characterized in that the acid content is 44% to 70%, the catalyst content is 0.1% to 1%, the organic acid anhydride content is 20% to 45%, and the vinyl-containing sulfonic acid content is 1% to 10%, based on 100% by mass of the total of the acid, the catalyst, the organic acid anhydride, and the vinyl-containing sulfonic acid; preferably, the acid content is 50% to 60%, the catalyst content is 0.5% to 1%, the organic acid anhydride content is 35% to 44%, and the vinyl-containing sulfonic acid content is 4.5% to 5%.
4. The method according to any one of claims 1 to 3, wherein the amount of the initiator is 0.1 to 0.7% by mass of the total mass of the acid, the organic acid anhydride and the vinyl-containing sulfonic acid monomer, preferably 0.3 to 0.5% by mass of the total mass of the acid, the organic acid anhydride and the vinyl-containing sulfonic acid monomer; more preferably, the mass ratio of the water to the acid is from 3:10 to 3: 11.
5. The method according to any one of claims 1 to 4, wherein the acid is glacial acetic acid and/or phosphorous acid; preferably, the acid is a mixture of glacial acetic acid and phosphorous acid, and the mass ratio of the glacial acetic acid to the phosphorous acid is 0.28-0.4: 1; and/or
The organic acid anhydride comprises at least one selected from succinic anhydride, phthalic anhydride and benzoic anhydride; and/or
The vinyl-containing sulfonic acid comprises 2-acrylamido-2-methylpropanesulfonic acid and/or 2-acryloxy-2-methylpropanesulfonic acid.
6. The method of any one of claims 1 to 5, wherein the catalyst comprises tetrabutylammonium bromide and/or Al2O3(ii) a And/or
The initiator comprises at least one selected from ammonium persulfate, potassium persulfate, azobisisobutyramidine hydrochloride and azobisisobutyramidine hydrochloride.
7. The method according to any one of claims 1 to 6, wherein the first temperature and the second temperature are independently 60 to 90 ℃; and/or
The third temperature is 40 to 75 ℃; and/or
The fourth temperature is 70 to 110 ℃;
preferably, the first temperature is 70 to 80 ℃; and/or
The second temperature is 60 to 75 ℃; and/or
The third temperature is 55 to 60 ℃.
8. The production method according to any one of claims 1 to 7, characterized in that, in step 1), the time of the catalytic reaction is 1 to 5 hours, preferably 1 to 2 hours; and/or
In step 2), nitrogen is introduced for a period of 0.5 to 2 hours, preferably 1 to 1.5 hours; and/or
In step 3), the polymerization reaction time is 0.5 to 4 hours, preferably 1 to 2 hours; and/or
In step 4), the drying time is 24 to 30 hours.
9. The dispersant prepared by the preparation method according to any one of claims 1 to 8.
10. Use of the dispersant prepared by the preparation method according to any one of claims 1 to 8 in drilling fluids.
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Citations (5)

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Publication number Priority date Publication date Assignee Title
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CN101928366A (en) * 2009-06-26 2010-12-29 中国石油化工集团公司 Method for preparing viscosity breaking agent for drilling fluid
CN103045185A (en) * 2011-10-17 2013-04-17 中国石油化工股份有限公司 Super-high density drilling fluid dispersing agent and preparation method thereof
CN105694831A (en) * 2016-03-17 2016-06-22 中国石油集团渤海钻探工程有限公司 High-temperature-resistant and salt-resistant viscosity reducer and preparation method and application thereof
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