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A kind of amphoteric polycarboxylic acid dispersant for oil well cement and its preparation method and application

An amphoteric polycarboxylic acid and oil well cement technology, which is applied in the field of oil well cement admixtures, can solve the problems of different components and application environments of construction cement and oil well cement, difficulty in meeting the requirements of comprehensive performance of cement slurry, and slow development of early strength of cement stone, etc. , to achieve the effects of low cost, enhanced comprehensive performance, improved dispersion and dispersion retention

Active Publication Date: 2020-03-17
TIANJIN UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this polycarboxylic acid dispersant has achieved good results in the field of construction cement, the composition and application environment of construction cement and oil well cement are different, and the above-mentioned dispersant is not suitable for oil well cement.
In order to solve the different degrees of retardation of polycarboxylic acid dispersants at low temperatures, the Chinese patent "Preparation Method for Oil Well Cement Dispersants" (Application No.: 201710537241.3) combined self-made dispersants, polycarboxylic acid dispersants and sulfur Acetone-formaldehyde condensate three kinds of dispersants are compounded and used. The compounded dispersant can effectively improve the strength and rheological properties of cement. However, this kind of dispersant needs to be compounded and used, and the preparation process is relatively complicated, which is not conducive to on-site construction.
[0005] In recent years, although some progress has been made in the research on polycarboxylate dispersants for oil well cement, there are still some shortcomings, because the current polycarboxylate dispersants are mainly monomers containing carboxyl functional groups, because carboxyl groups will be adsorbed to cement particles. On the surface, the hydration process of cement is inhibited, resulting in the slow development of early strength of cement stone, and there are also problems such as poor dispersion and retention of cement slurry, so it is difficult to meet the requirements of controlling the comprehensive performance of cement slurry in the cementing process

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  • A kind of amphoteric polycarboxylic acid dispersant for oil well cement and its preparation method and application
  • A kind of amphoteric polycarboxylic acid dispersant for oil well cement and its preparation method and application
  • A kind of amphoteric polycarboxylic acid dispersant for oil well cement and its preparation method and application

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Embodiment 1

[0035] A preparation method of amphoteric polycarboxylic acid dispersant for oil well cement, comprising the following steps:

[0036] (1) Dissolve 30.98g of methallyl polyethylene glycol with a number average molecular weight of 600 in 34g of distilled water, stir and raise the temperature to 65°C, add 0.5494g of oxidant ammonium persulfate, and continue to stir to obtain a mixed solution;

[0037] (2) Weigh 2.79g acrylic acid, 6.23g dimethyldiallylammonium chloride, add 13g distilled water, stir evenly into A liquid; weigh the reducing agent sodium bisulfite equivalent to 1 times the mole of the oxidant ammonium persulfate Dissolve in 13g of distilled water, stir evenly into B solution;

[0038] (3) Add liquid A and liquid B to the mixture obtained in step (1) at the same time. Add liquid A at a constant speed for 1.5 hours, and liquid B at a constant speed for 2.0 hours. After both A and B are dropped, continue Incubate at 65°C for 3h, adjust pH=6.5 with NaOH to obtain amphoteric...

Embodiment 2

[0040] A preparation method of amphoteric polycarboxylic acid dispersant for oil well cement, comprising the following steps:

[0041] (1) Dissolve 29.70g of number average molecular weight 2400 methallyl polyethylene glycol in 30g of distilled water, stir and raise the temperature to 60°C, add 0.4g of ammonium persulfate, and continue to stir to obtain a mixed solution;

[0042] (2) Weigh 1.34g of maleic anhydride, 3.26g of dimethyldiallylammonium chloride, add 10g of distilled water, stir evenly into A solution; weigh 0.8 times the oxidant ammonium persulfate mole of reducing agent sulfurous acid Sodium hydrogen is dissolved in 10g of distilled water and stirred evenly into B solution;

[0043] (3) Add liquid A and liquid B to the mixture obtained in step (1) at the same time. Add liquid A at a constant speed for 1.5 hours, and liquid B at a constant speed for 2.0 hours. After both A and B are dropped, continue Incubate at 60°C for 4h, adjust pH=6 with NaOH to obtain amphoteric po...

Embodiment 3

[0045] A preparation method of amphoteric polycarboxylic acid dispersant for oil well cement, comprising the following steps:

[0046] (1) Dissolve 32.37g of allyl polyethylene glycol with a number average molecular weight of 600 in 35g of distilled water, stir and raise the temperature to 70°C, add 0.8g of potassium persulfate, and continue to stir to obtain a mixed solution;

[0047] (2) Weigh 4.37g itaconic acid, 8.97g methacryloyloxyethyltrimethylammonium chloride, add 15g distilled water, stir evenly to A solution; weigh 1.2 times the reduction of the oxidant potassium persulfate mole Dissolve tetramethylethylenediamine in 15g of distilled water and stir it evenly into liquid B;

[0048] (3) Add liquid A and liquid B to the mixture obtained in step (1) at the same time, add 1.0 liquid A uniform dropwise, and add liquid B uniform 1.5h dropwise. After both A and B have been added, continue to Incubate at 70°C for 2h, adjust pH=7 with NaOH to obtain amphoteric polycarboxylic acid ...

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Abstract

The invention discloses an amphiprotic polycarboxylic acid dispersant for oil well cement as well as a preparation method and an application. The preparation method of the amphiprotic polycarboxylic acid dispersant for oil well cement comprises steps as follows: (1) unsaturated polyether macromonomers are dissolved in distilled water and stirred, an oxidizing agent is added, the mixture is continuously stirred, and a mixed solution is obtained; (2) carboxylic acid monomers and cationic monomers are weighed, distilled water is added, the mixture is stirred uniformly, and a solution A is obtained, a reducer is weighed and dissolved in distilled water, the mixture is stirred uniformly, and a solution B is obtained; (3) the solution A and the solution B are dropwise added to the mixed solution, the mixture is kept at the temperature of 60-70 DEG C for 2-4 h, pH is adjusted, and the amphiprotic polycarboxylic acid dispersant for oil well cement is obtained. The preparation process is simple, water is taken as a solvent, and the production process is green and environmentally friendly. The amphiprotic polycarboxylic acid dispersant for oil well cement can effectively improve the flowability of oil well cement slurry and reduce the viscosity of the cement slurry, has good dispersion and rheological property for the cement slurry, is low in delayed coagulation property and promotes early strength development of set cement.

Description

Technical field [0001] The invention relates to the technical field of oil well cement admixtures, in particular to an amphoteric polycarboxylic acid dispersant for oil well cement, and a preparation method and application thereof. Background technique [0002] In the cementing engineering of oil and gas wells, the cement slurry needs to flow through the hollow casing, and then return from the bottom of the well to the narrow annular space between the casing and the well wall, which requires the cement slurry to have good rheology. If the rheology of the cement slurry is not good, the flow resistance of the cement slurry will increase and the pumping pressure will increase. Once the excessive flow resistance and the annulus hydrostatic column pressure exceed the formation rupture pressure, it will cause formation leakage and cause serious cementing accidents. Therefore, the rheology of cement slurry has a greater impact on the safety of cementing construction. [0003] The use of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/06C08F226/02C08F220/06C08F222/06C08F222/02C08F220/34C08F2/10C08F4/40C04B24/26C04B103/40
CPCC04B24/2658C04B24/267C04B2103/408C08F2/10C08F4/40C08F283/065C08F226/02C08F220/34
Inventor 郭锦棠徐杨陈頔胡苗苗冯亚凯靳建洲齐奉忠于永金张弛冯宇思
Owner TIANJIN UNIV