CN112645625B - Composite oil well cement polycarboxylic acid dispersant, and preparation method and application thereof - Google Patents
Composite oil well cement polycarboxylic acid dispersant, and preparation method and application thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/16—Sulfur-containing compounds
- C04B24/161—Macromolecular compounds comprising sulfonate or sulfate groups
- C04B24/163—Macromolecular compounds comprising sulfonate or sulfate groups obtained by reactions only involving carbon-to-carbon unsaturated bonds
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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
- C08F220/58—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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- 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
- C08F222/00—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 carboxyl radical and containing at least one other carboxyl radical in the molecule; Salts, anhydrides, esters, amides, imides, or nitriles thereof
- C08F222/02—Acids; Metal salts or ammonium salts thereof, e.g. maleic acid or itaconic acid
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/40—Surface-active agents, dispersants
- C04B2103/408—Dispersants
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Abstract
The invention relates to a composite oil well cement polycarboxylic acid dispersant in the field of oil field well cementation, and a preparation method and application thereof. The composite oil well cement polycarboxylic acid dispersant comprises a binary linear polycarboxylic acid copolymer, an early strength agent and a nucleating agent, wherein the binary linear polycarboxylic acid copolymer is a linear structure polymer comprising a structural unit A and a structural unit B; wherein the molar ratio of the structural unit A to the structural unit B is in the range of (5:95) to (95: 5); the structural unit A is provided by a monomer 2-acrylamide-2-methylpropanesulfonic acid; the structural unit B is provided by an unsaturated carboxylic acid monomer. The dispersant disclosed by the invention is simple in component and preparation process, excellent in dispersing effect, and applicable to the temperature as high as 150 ℃, so as to meet the well cementation requirement of continuous and deep exploration and development and provide guarantee for safely and efficiently carrying out deep well cementation operation.
Description
Technical Field
The invention relates to the field of oilfield cementing, in particular to a composite oil well cement polycarboxylic acid dispersant, and a preparation method and application thereof.
Background
Oil well cement slurry used in well cementing construction is a high-concentration solid-phase particle water-based suspension system, and a dispersing agent is often required to be added to improve the rheological property of the oil well cement slurry. At present, the most widely used dispersant in oil well cement slurry is sulfonated ketone-aldehyde polycondensate dispersant, and the dispersant is characterized in that: the raw materials have wide sources, proper price and strong temperature resistance, are suitable for various oil well cements, have good compatibility with most additives and obtain better effect in field application.
However, with the continuous deepening of exploration and development, deep well ultra-deep wells are more and more, a plurality of new additives and high-performance special cement slurry systems are brought along with the emergence and application of the deep well ultra-deep wells, and in the actual well cementation construction, the sulfonated aldehyde ketone dispersant is often difficult to meet the slurry preparation requirements of the special cement slurry systems or is incompatible with the new additives. For example, in a special cement paste system such as an ultrahigh density/ultralow density cement paste system, an elastoplastic cement paste system or other particle complex conditions, the aldehyde ketone dispersant has a poor dispersing effect, and the consistency of the cement paste cannot be reduced even if the aldehyde ketone dispersant exceeds the maximum addition amount, so that the slurry preparation is difficult and the construction is influenced. For example, when the sulfonated aldehyde ketone dispersant is used with a new AMPS water loss reducer, competitive adsorption occurs on the surface of cement particles, so that the water loss reducer is ineffective, and thus water loss cannot be controlled.
The polycarboxylic acid dispersant has the outstanding advantages of higher water reducing rate, low mixing amount, excellent dispersibility and retention performance, low concrete shrinkage, high adaptability to cement and the like, is widely applied in the construction industry since 90 s, and has a great reference significance for the research and development of the cement dispersant in oil fields. The polycarboxylic acid dispersant has not been popularized in the well cementation industry, mainly the application environment of the polycarboxylic acid dispersant in the well cementation industry is more harsh than that of the concrete industry, and the concrete polycarboxylic acid dispersant on the market is not suitable for the well cementation industry at present. In the well cementation industry, particularly in deep well cementing, high temperature, high pressure and large temperature difference are often involved, and the polycarboxylic acid dispersant used in the current construction industry can resist the temperature of 70 ℃ at most and cannot meet the requirements of well cementation construction.
Compared with the concrete industry, the research and development of polycarboxylic acid dispersants in the well cementation industry is relatively lagged, related documents are few, only a few research units achieve some results, and besides the application of the polycarboxylic acid dispersant F46L developed by the cooperation of the Zhonghai oil and the PLANK in Germany, the polycarboxylic acid dispersant has almost no related products and industrial application. But the development of the polycarboxylic acid water reducing agent and the polycarboxylic acid macromonomer in the concrete industry provides powerful reference and raw material advantages for the development and application of the polycarboxylic acid water reducing agent and the polycarboxylic acid macromonomer in oil well cement.
Chinese patent publication No. CN 107602773a discloses a polycarboxylic acid dispersant for oil well cement and a preparation method thereof, wherein a plurality of raw materials are used, polymerization requires an acidic reaction under the protection of inert gas, the raw material components are complex, and the dispersibility is not high enough; chinese patent with publication number CN106117424A discloses a copolymer of itaconic acid and 2-acrylamide-2-methyl propane sulfonic acid, a preparation method and application thereof, but the product has stronger retardation performance, and if the product is used for oil well cement, the accident of ultra retardation at the low temperature end can be caused.
Disclosure of Invention
The invention provides a composite oil well cement polycarboxylic acid dispersant with higher dispersion efficiency, better compatibility and high temperature resistance, aiming at solving the problems that the existing oil well cement sulfonated aldehyde ketone dispersant in the prior art is difficult to meet the slurry preparation requirement of a special cement slurry system or is incompatible with a new additive, and the polycarboxylic acid dispersant used in the construction industry is low in temperature resistance and difficult to meet the application requirement of the oil well cement industry in high-temperature and high-pressure environments. In particular to a composite oil well cement polycarboxylic acid dispersant, a preparation method and application thereof. The dispersant disclosed by the invention is simple in component and preparation process, excellent in dispersing effect, and applicable to a temperature as high as 150 ℃, can meet the well cementation requirement of continuous and deep exploration and development, and provides guarantee for safely and efficiently carrying out deep well cementing operation.
One of the purposes of the invention is to provide a composite oil well cement polycarboxylic acid dispersant which comprises a binary linear polycarboxylic acid copolymer, an early strength agent and a nucleating agent; different from the polycarboxylic acid dispersant with a comb-shaped structure used in the construction industry, the binary linear polycarboxylic acid dispersant is a linear structure polymer and has high dispersion efficiency.
The binary linear polycarboxylic acid copolymer is a linear structure polymer containing a structural unit A and a structural unit B;
wherein the molar ratio of the structural unit A to the structural unit B can be in the range of (5:95) to (95:5), preferably (60:40) to (80: 20); the structural unit A is provided by a monomer 2-acrylamide-2-methylpropanesulfonic acid; the structural unit B is provided by an unsaturated carboxylic acid monomer.
The unsaturated carboxylic acid monomer can be selected from at least one of itaconic acid, acrylic acid, maleic anhydride and fumaric acid;
the mass ratio of the early strength agent to the 2-acrylamido-2-methylpropanesulfonic acid may be (1:10) to (50:1), preferably (1:10) to (20:1), more preferably (1:5) to (8:1), and preferably (1:4) to (4: 1);
the mass ratio of the nucleating agent to 2-acrylamido-2-methylpropanesulfonic acid may be (1:10) to (50:1), preferably (1:5) to (10:1), more preferably (1:5) to (4:1), and still more preferably (1:2) to (2: 1);
the early strength agent can be selected from one or more of strong electrolyte inorganic salts and water-soluble organic matters; preferably, the early strength agent may include, but is not limited to, at least one of calcium chloride, sodium chloride, aluminum chloride, sodium sulfate, potassium sulfate, calcium nitrite, calcium nitrate, urea, sodium nitrite, triethanolamine, calcium formate, acetic acid, and acetate, more preferably triethanolamine and/or calcium chloride, and even more preferably both triethanolamine and calcium chloride are used together.
The nucleating agent can be selected from one or more of sodium metasilicate, calcium metasilicate and the like, and sodium metasilicate and/or calcium metasilicate are preferred.
The invention also aims to provide a preparation method of the composite oil well cement polycarboxylic acid dispersant, which comprises the following steps: and mixing the components including the binary linear polycarboxylic acid copolymer, the early strength agent and the nucleating agent according to the using amount to obtain the composite oil well cement polycarboxylic acid dispersant. Specifically, the method comprises the steps of carrying out polymerization reaction on 2-acrylamide-2-methylpropanesulfonic acid and unsaturated carboxylic acid monomers to obtain a binary linear polycarboxylic acid copolymer, and then adding an early strength agent and a nucleating agent to obtain the composite oil well cement polycarboxylic acid dispersing agent.
Specifically, the preparation method comprises the following steps:
(1) adding 2-acrylamide-2-methylpropanesulfonic acid into deionized water, and stirring until the 2-acrylamide-2-methylpropanesulfonic acid is dissolved; adjusting the pH value; heating, adding unsaturated carboxylic acid monomer, and stirring;
(2) dropwise adding an initiator solution into the solution obtained in the step (1), heating while dropwise adding, and continuing to react for a period of time after dropwise adding is finished;
(3) and (3) cooling the solution obtained in the step (2) to a certain temperature, adding the early strength agent and the nucleating agent, and stirring to obtain the material.
Specifically, the method comprises the following steps:
in the step (1), the step (c),
adding 100 parts by weight of 2-acrylamide-2-methylpropanesulfonic acid into 200-1000 parts by weight of deionized water, and stirring until the deionized water is dissolved;
the molar ratio of the 2-acrylamido-2-methylpropanesulfonic acid to the unsaturated carboxylic acid monomer may be (5:95) to (95:5), preferably (60:40) to (80: 20);
the pH value is adjusted to be 9-12;
and heating to 30-70 ℃.
In the step (2), the step (c),
the initiator can be a persulfate initiator; the persulfate initiator can be selected from at least one of sodium persulfate, potassium persulfate and ammonium persulfate;
the dosage of the initiator can be 0.1-1% of the total weight of the 2-acrylamide-2-methylpropanesulfonic acid and the unsaturated carboxylic acid monomer; the weight concentration of the initiator solution can be 5-20%;
and (3) heating to 45-80 ℃ while dropping an initiator solution, continuously reacting for 2-6 hours at the temperature after dropping is finished, and then cooling to 20-40 ℃.
In the step (3), the step (c),
stirring until the early strength agent and the nucleating agent are completely dissolved, and the system becomes a uniform phase, and preferably stirring for 15-60 minutes to obtain the composite oil well cement polycarboxylic acid dispersing agent.
The invention also aims to provide application of the composite oil well cement polycarboxylic acid dispersant. In particular, it may be applied in oilfield cementing. Preferably, when the cement slurry for well cementation is specifically configured, the dosage of the dispersant can be 0.1 to 3 percent of the mass of the oil well cement.
In order to improve the defect of low temperature resistance of the comb-shaped polycarboxylic acid dispersing agent used in the building industry, the invention adopts 2-acrylamide-2-methyl propanesulfonic acid as a temperature-resistant framework, provides higher use tolerance temperature and salt resistance, and the decomposition temperature of the obtained polymer can reach 290 ℃. The carboxylic acid monomer then provides the polymer with strong adsorption groups on the cement particles. The binary polycarboxylic acid copolymer is usually used as a retarder in oil well cement, but the dispersing performance of the binary polycarboxylic acid copolymer is not negligible, but if the binary polycarboxylic acid copolymer is used as a dispersing agent, the binary polycarboxylic acid copolymer has the defects of super retardation and influence on the early strength of the set cement, and construction safety accidents can be caused, so the retardation and the influence on the early strength of the set cement are effectively controlled by compounding the early strength agent and the nucleating agent. The early strength agent is used for promoting the 48-hour strength of the oil well cement slurry and avoiding the 48-hour failure strength or the low strength. The nucleating agent is used for counteracting the delayed coagulation effect of the polycarboxylic acid dispersing agent, so that the polycarboxylic acid dispersing agent has an ultra-delayed coagulation effect when used at a medium and low temperature, and the thickening time meets the construction design requirement.
The invention has the following effects:
(1) compared with the traditional sulfonated aldehyde ketone polycondensate dispersant, the composite oil well cement polycarboxylic acid dispersant provided by the invention has the advantages of small addition and strong dispersing capacity;
(2) the composite oil well cement polycarboxylic acid dispersant provided by the invention can resist temperature up to 150 ℃, the decomposition temperature of the product in a nitrogen atmosphere can reach 290 ℃, the temperature of the product in cement paste can resist temperature up to 200 ℃, and the defect that the polycarboxylic acid dispersant used in the building industry has low temperature resistance is overcome;
(3) the invention adopts the dicarboxylic acid copolymer as the dispersant, and simultaneously compounds the early strength agent and the nucleating agent, thereby effectively controlling the defects of delayed coagulation and influence on the early strength of the set cement;
(4) compared with the existing polycarboxylic acid oil well cement dispersant and the preparation process thereof, the concrete preparation process and the obtained product thereof have the advantages of simple components, simple process and higher temperature resistance.
Detailed Description
The present invention will be further described with reference to the following examples. However, the present invention is not limited to these examples.
The chemical materials used in the examples are all commercially available.
Example 1
Adding 25g of 2-acrylamide-2-methylpropanesulfonic acid into 50g of deionized water, stirring until the mixture is dissolved, adding NaOH solution to adjust the pH value of the system to 9, heating to 30 ℃, adding 298g of itaconic acid, wherein the molar ratio of the 2-acrylamide-2-methylpropanesulfonic acid to the itaconic acid is 5:95, and stirring for about 10 min; 8.4g of sodium persulfate initiator solution with the mass concentration of 5% is dripped in, the mixture reacts for 6 hours at the temperature of 50 ℃, the mixture is cooled to 20 ℃, 100g of calcium chloride and 50g of sodium metasilicate pentahydrate are added, and the mixture is stirred for 15 minutes to prepare a composite oil well cement polycarboxylic acid dispersant sample 1.
Example 2
Adding 125g of 2-acrylamide-2-methylpropanesulfonic acid into 300g of deionized water, stirring until the solution is dissolved, adding NaOH solution to adjust the pH value of the system to 10, heating to 50 ℃, adding 53g of itaconic acid, and stirring for about 30 min; 4.5g of sodium persulfate initiator solution with the mass concentration of 20% is dropwise added, the mixture reacts for 2 hours at the temperature of 80 ℃, the mixture is cooled to 40 ℃, 6.25g of triethanolamine, 25g of calcium chloride and 75g of sodium metasilicate pentahydrate are added, and the mixture is stirred for 60 minutes to prepare a composite oil well cement polycarboxylic acid dispersant sample 2.
The oil well cement slurry is prepared according to GB/T19139-. The formula of the cement paste is as follows: jiahua grade G cement, 8 percent of micro-silicon, 4 percent of fluid loss additive, water and 1 percent of dispersant, wherein the fluid loss additive is AMPS polymer DZJ-Y, the water-cement ratio is 0.44, the dispersant is sample 2, and the addition amount is calculated by taking the weight of pure cement as a reference. In addition, a sulfonated aldehyde ketone polycondensate oil well cement dispersant USZ (Shandong Dezhou continental shelf assistant factory) is adopted to replace the sample 2 for comparison experiment, and the USZ is brownish red solid powder. The rheological properties of the cement slurries without dispersant and with different dispersants added at room temperature were tested using a six-speed rheometer and the results are shown in table 1.
TABLE 1 dispersancy Performance test of sample 2
As can be seen from Table 1, the n and K values of the cement paste are greatly optimized after the dispersant is added. Although the USZ was 1% in comparison to sample 2, the DZS was a solid, sample 2 was a 37% liquid, i.e., the folded solids loading was 0.37%, and the resulting n value was greater and K value was less than the DZS with a solids loading of 1%, thus sample 2 had a more excellent dispersing effect than the DZS.
Example 3
Adding 2 g of acrylamide-2-methylpropanesulfonic acid into 300g of deionized water, stirring until the mixture is dissolved, adjusting the pH value to 12 by using a NaOH solution, putting the reactor into a constant-temperature water bath at 70 ℃, adding 53g of itaconic acid, and stirring for about 20 min; 8.9g of sodium persulfate initiator solution with the mass concentration of 10 percent is dripped to react for 2 hours at the temperature of 80 ℃, the mixture is cooled to 30 ℃, 3g of triethanolamine, 30g of calcium chloride and 95g of sodium metasilicate pentahydrate are added to be stirred for 50 minutes, and the composite oil well cement polycarboxylic acid dispersant sample 3 is prepared.
Oil well cement slurries were prepared according to GB/T19139-. The formula of the cement paste is as follows: jiahua grade G cement + 8% microsilica + 4% DZJ-Y + water + 1% sample 3, the water cement ratio is 0.44. The water loss reduction and temperature resistance of the cement slurry added to sample 3 were tested by a water loss test and a thickening test, and the test results are shown in table 2.
TABLE 2 Water loss reduction and thickening test results for cement slurries with sample 3 added
As can be seen from Table 2, the thickening time, the transition time and the water loss can all meet the requirements of the cementing operation when sample 3 is applied at 150 ℃. In addition, in the experiment, if the sample 3 is not added, the cement paste is not raised to 150 ℃ and is thickened and cemented, the thickening time is prolonged to 126min when the sample 3 is added, the thickening curve is smooth and the cement paste is thickened at a right angle, and the sample 3 can be used at the temperature of up to 150 ℃ and has a certain retardation effect at the temperature.
Claims (14)
1. The composite oil well cement polycarboxylic acid dispersant is characterized in that:
the composite oil well cement polycarboxylic acid dispersant comprises a binary linear polycarboxylic acid copolymer, an early strength agent and a nucleating agent; wherein the binary linear polycarboxylic acid copolymer is a linear structure polymer containing a structural unit A and a structural unit B; wherein the molar ratio of the structural unit A to the structural unit B is in the range of (5:95) to (95: 5);
the structural unit A is provided by a monomer 2-acrylamide-2-methylpropanesulfonic acid; the structural unit B is provided by an unsaturated carboxylic acid monomer;
the unsaturated carboxylic acid monomer is selected from at least one of itaconic acid, acrylic acid, maleic anhydride and fumaric acid;
the mass ratio of the early strength agent to the 2-acrylamido-2-methylpropanesulfonic acid is (1:10) - (50: 1);
the early strength agent is selected from one or more of strong electrolyte inorganic salts and water-soluble organic matters;
the mass ratio of the nucleating agent to the 2-acrylamido-2-methylpropanesulfonic acid is (1:10) - (50: 1).
2. The composite oil well cement polycarboxylic acid dispersant of claim 1, characterized in that:
the molar ratio of the structural unit A to the structural unit B is in the range of (60:40) to (80: 20).
3. The composite oil well cement polycarboxylic acid dispersant of claim 1, characterized in that:
the mass ratio of the early strength agent to the 2-acrylamido-2-methylpropanesulfonic acid is (1:10) - (20: 1).
4. The composite oil well cement polycarboxylic acid dispersant of claim 3, characterized in that:
the early strength agent is at least one selected from calcium chloride, sodium chloride, aluminum chloride, sodium sulfate, potassium sulfate, calcium nitrite, calcium nitrate, urea, sodium nitrite, triethanolamine, calcium formate, acetic acid and acetate.
5. The composite oil well cement polycarboxylic acid dispersant of claim 1, characterized in that:
the mass ratio of the nucleating agent to the 2-acrylamido-2-methylpropanesulfonic acid is (1:5) - (10: 1);
the nucleating agent is selected from sodium metasilicate and/or calcium metasilicate.
6. The method for preparing the composite polycarboxylic acid dispersant for oil well cement according to any of claims 1 to 5, characterized by comprising the steps of:
mixing the components including the binary linear polycarboxylic acid copolymer, the early strength agent and the nucleating agent according to the using amount to obtain the composite oil well cement polycarboxylic acid dispersant;
wherein the preparation method of the binary linear polycarboxylic acid copolymer comprises the following steps:
carrying out polymerization reaction on 2-acrylamide-2-methylpropanesulfonic acid and an unsaturated carboxylic acid monomer to obtain a binary linear polycarboxylic acid copolymer.
7. The method for preparing the composite polycarboxylic acid dispersant for oil well cement according to claim 6, characterized by comprising the steps of:
(1) dissolving 2-acrylamide-2-methylpropanesulfonic acid in deionized water; adjusting the pH value; heating, adding unsaturated carboxylic acid monomer, and stirring;
(2) adding an initiator solution into the solution obtained in the step (1), heating while dropwise adding, and reacting;
(3) and (3) cooling the solution obtained in the step (2), adding the early strength agent and the nucleating agent, and stirring to obtain the material.
8. The method for preparing the composite oil well cement polycarboxylic acid dispersant according to claim 7, characterized in that:
in the step (1), the step (c),
adding 100 parts by weight of 2-acrylamide-2-methylpropanesulfonic acid into 200-1000 parts by weight of deionized water, and stirring until the deionized water is dissolved.
9. The method for preparing the composite oil well cement polycarboxylic acid dispersant according to claim 7, characterized in that:
in the step (1), the step (c),
the pH value is adjusted to be 9-12;
and heating to 30-70 ℃.
10. The method for preparing the composite oil well cement polycarboxylic acid dispersant according to claim 7, characterized in that:
in the step (2), the step (c),
the initiator is persulfate initiator; the persulfate initiator is selected from at least one of sodium persulfate, potassium persulfate and ammonium persulfate;
the dosage of the initiator is 0.1 to 1 percent of the total weight of the 2-acrylamide-2-methylpropanesulfonic acid and the unsaturated carboxylic acid monomer;
the weight concentration of the initiator solution is 5-20%.
11. The method for preparing the composite oil well cement polycarboxylic acid dispersant according to claim 7, characterized in that:
in the step (2), the temperature is raised to 45-80 ℃ while the initiator solution is dripped, the reaction is continued for 2-6 hours at the temperature after the dripping is finished, and then the temperature is reduced to 20-40 ℃.
12. The dispersant prepared by the method for preparing the composite oil well cement polycarboxylic acid dispersant according to any one of claims 6 to 11.
13. Use of the composite oil well cement polycarboxylic acid dispersant according to claim 1 or 12 in oil field cementing.
14. The use of the composite oil well cement polycarboxylic acid dispersant of claim 13 for cementing wells in the oil field, characterized in that: the dosage of the dispersant is 0.1-3% of the oil well cement.
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| CN107502324A (en) * | 2017-08-22 | 2017-12-22 | 中国海洋石油总公司 | A kind of light-weight cement slurry multiple-effect additive and preparation method thereof |
| CN109609106A (en) * | 2018-12-29 | 2019-04-12 | 上海三瑞高分子材料股份有限公司 | A kind of low temperature mining area oil well cementing early strength agent and preparation method thereof |
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