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A high-temperature oil well cement retarder capable of inhibiting abnormal gelation and its preparation method

A technology of oil well cement and retarder, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve problems such as abnormal thickening curve and abnormal gelation of cement slurry, achieve stable product performance, and improve high temperature stability , Improve the effect of consistency and rheology

Active Publication Date: 2022-03-04
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the abnormal gelation phenomenon of cement slurry under high temperature caused by the existing AMPS type polycarboxylate retarder in the prior art, and the problems of abnormal thickening curves such as "bulging" and "wrapping", and provide a kind of High temperature oil well cement retarder for inhibiting abnormal gelation

Method used

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  • A high-temperature oil well cement retarder capable of inhibiting abnormal gelation and its preparation method
  • A high-temperature oil well cement retarder capable of inhibiting abnormal gelation and its preparation method
  • A high-temperature oil well cement retarder capable of inhibiting abnormal gelation and its preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] A preparation method of a high-temperature oil well cement retarder capable of inhibiting abnormal gelation, comprising the steps of:

[0045] (1) Dissolve 22.75g of 2-acrylamido-2-methylpropanesulfonic acid and 7g of itaconic acid in 55g of deionized water, stir well, and adjust the pH to 5.5 with 0.5mol / L sodium hydroxide solution;

[0046](2) Weigh 3.5g of N-vinylcaprolactam and 3.5g (50wt% aqueous solution) of methacryloylpropyltrimethylammonium chloride into the solution obtained in step (1), stir evenly, and heat up to 60°C;

[0047] (3) Weigh 0.7g of ammonium persulfate and dissolve it in 9.3g of deionized water to make a solution, add it into the solution obtained in step (2) under stirring at a speed of 215r / min, keep it warm at 60°C for 30min, and heat up to 80°C React at a constant temperature for 3 hours to obtain a high-temperature oil well cement retarder that can inhibit abnormal gelation.

Embodiment 2

[0049] A preparation method of a high-temperature oil well cement retarder capable of inhibiting abnormal gelation, comprising the steps of:

[0050] (1) Dissolve 23g of 2-acrylamido-2-methylpropanesulfonic acid and 6g of maleic anhydride in 50g of deionized water, stir evenly, and adjust the pH to 6 with 0.5mol / L potassium hydroxide solution;

[0051] (2) Weigh 4g of N-vinylpyrrolidone and 2g (75wt% aqueous solution) of methacryloyloxyethyltrimethylammonium chloride into the solution obtained in step (1), stir evenly, and heat up to 55°C;

[0052] (3) Weigh 0.9g of potassium persulfate and dissolve it in 12g of deionized water to make a solution, add it into the solution obtained in step (2) under stirring at a rotation speed of 180r / min, keep it warm at 55°C for 20min, and heat up to 70°C at a constant temperature After reacting for 2 hours, a high-temperature oil well cement retarder capable of inhibiting abnormal gelation was obtained.

Embodiment 3

[0054] A preparation method of a high-temperature oil well cement retarder capable of inhibiting abnormal gelation, comprising the steps of:

[0055] (1) Dissolve 21g of 2-acrylamido-2-methylpropanesulfonic acid and 8g of mesaconic acid in 60g of deionized water, stir well, and adjust the pH to 5 with 0.5mol / L sodium hydroxide solution;

[0056] (2) Weigh 3g of 2-vinylmorpholine and 4.5g (50wt% aqueous solution) of methacryloylpropyltrimethylammonium chloride into the solution obtained in step (1), stir evenly, and heat up to 65°C ;

[0057] (3) Weigh 0.5g of azobisisobutylimidazoline hydrochloride and dissolve it in 8g of deionized water to form a solution, add it into the solution obtained in step (2) under stirring at a speed of 250r / min, and keep it warm at 65°C After 40 minutes, the temperature was raised to 85°C for 4 hours of constant temperature reaction to obtain a high-temperature oil well cement retarder that can inhibit abnormal gelation.

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Abstract

The invention discloses a high-temperature oil well cement retarder capable of inhibiting abnormal gelation and a preparation method thereof. The preparation method comprises: (1) mixing 2-acrylamido-2-methylpropanesulfonic acid and unsaturated carboxylic acid monomer Dissolve in deionized water, stir evenly, and adjust the pH to 5‑6; (2) Take steric hindrance functional monomers and cationic functional monomers and add them to the solution obtained in step (1), stir evenly, and heat up to 55‑65 ℃; (3) Take the initiator and dissolve it in deionized water to make a solution, add it to the solution obtained in step (2) under stirring, keep it warm at 55-65°C for 20-40min, and heat up to 70-85°C for constant temperature reaction 2 ‑4h to obtain a high-temperature oil well cement retarder that can inhibit abnormal gelation. The retarder of the invention can inhibit the phenomenon of "bulging" and "wrapping" of the cement slurry in the temperature range of 120-150 DEG C, without affecting the strength development of the cement stone, and the comprehensive performance of the cement slurry is good.

Description

technical field [0001] The invention relates to a high-temperature oil well cement retarder used in petroleum production and cementing, a preparation method and application thereof, in particular to a high-temperature oil well cement retarder capable of inhibiting abnormal gelation, a preparation method and application thereof. Background technique [0002] During the cementing operation of oil and gas wells, the cement slurry needs to be pumped into the bottom of the well through the hollow of the casing, and then returned to the wellhead or designated position from the narrow annular area between the casing and the well wall. In order to maintain the good fluidity of the cement slurry during this pumping time, it is often necessary to add a retarder to the cement slurry to prolong its setting time. Therefore, as one of the main admixtures of oil well cement, retarder plays an important role in precisely controlling the thickening time of cement slurry, ensuring the pumpabi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/58C08F222/02C08F226/06C08F220/34C08F222/06C08F226/10C09K8/467
CPCC08F220/585C09K8/467C08F222/02C08F226/06C08F220/34C08F222/06C08F226/10
Inventor 郭锦棠张航胡苗苗徐杨刘明李鹏鹏冯亚凯任相魁闫熙博
Owner TIANJIN UNIV
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