Unlock instant, AI-driven research and patent intelligence for your innovation.

Amphiprotic polycarboxylic acid dispersant for oil well cement as well as 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: 2018-12-14
TIANJIN UNIV +1
View PDF7 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Amphiprotic polycarboxylic acid dispersant for oil well cement as well as preparation method and application
  • Amphiprotic polycarboxylic acid dispersant for oil well cement as well as preparation method and application
  • Amphiprotic polycarboxylic acid dispersant for oil well cement as well as preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

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

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

[0038] (3) Add liquid A and liquid B dropwise to the mixed liquid obtained in step (1) at the same time, liquid A is added dropwise at a constant speed for 1.5h, liquid B is added dropwise at a constant speed for 2.0h, after both liquid A and liquid B are added dropwise, continue Insulate at 65°...

Embodiment 2

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

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

[0042] (2) Take by weighing 1.34g maleic anhydride, 3.26g dimethyl diallyl ammonium chloride, add 10g distilled water, stir to be A liquid; Weigh the reducing agent sulfurous acid equivalent to 0.8 times of the oxidant ammonium persulfate mole Sodium hydrogen was dissolved in 10g of distilled water, and stirred evenly to obtain liquid B;

[0043] (3) Add liquid A and liquid B dropwise to the mixed liquid obtained in step (1) at the same time, liquid A is added dropwise at a constant speed for 1.5h, liquid B is added dropwise at a constant speed for 2.0h, after both liquid A and liquid B are added dropwise, con...

Embodiment 3

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

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

[0047] (2) Weigh 4.37g itaconic acid, 8.97g methacryloyloxyethyltrimethylammonium chloride, add 15g distilled water, stir well to be A liquid; The agent tetramethylethylenediamine was dissolved in 15g of distilled water, and stirred evenly to obtain liquid B;

[0048](3) Add liquid A and liquid B dropwise to the mixed solution obtained in step (1), liquid A is added dropwise at a constant speed for 1.0 hours, liquid B is added dropwise for 1.5h at a constant speed, after liquid A and liquid B are all added dropwise, continue to Incubate at 70° C. for 2 hours, adjust pH=7 with NaOH, and obtain an amphoteric polyca...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

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, 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 of the casing, and then return from the bottom of the hole 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, it will increase the flow resistance of the cement slurry and increase the pumping pressure. Once the excessive flow resistance and the hydrostatic column pressure in the annular space exceed the formation fracture pressure, formation leakage will occur and serious cementing accidents will occur. Therefore, the rheology of cement slurry has a great influence on the safety of cementing construct...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(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