Weak-dispersion early-strength retarder for oil well cement and preparation method thereof

An early-strength technology for oil well cement, which is applied in the field of oilfield chemicals and admixtures for oil well cement cementing. Stability deterioration and other issues, to achieve the effect of good compatibility and compatibility, low cost, and stable product performance

Inactive Publication Date: 2022-02-18
成都欧美克石油科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this invention can solve the problem of abnormal gelation, but because the steric hindrance monomer hinders the adsorption of carboxyl groups, the linear relationship between the amount of retarder and the thickening time is not good, and the amount of retarder is too large, which affects the early stage of low temperature at the top. Strength development; at the same time, it has a certain degree of dispersion, resulting in poor high temperature stability as the amount increases

Method used

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  • Weak-dispersion early-strength retarder for oil well cement and preparation method thereof
  • Weak-dispersion early-strength retarder for oil well cement and preparation method thereof
  • Weak-dispersion early-strength retarder for oil well cement and preparation method thereof

Examples

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Embodiment 1

[0039]This embodiment provides a weakly dispersed early-strength type oil well cement retarder and its preparation method, comprising the following steps, by weight, 20 parts of AMPS, 20 parts of unsaturated carboxylic acid monomer, 10 parts of acrylamide 1. Add water to 15 parts of non-ionic macromonomer, stir until completely dissolved, add 0.1 part of sodium hydroxide solution with a mass concentration of 30% to adjust the pH to 4, stir evenly, heat up to 65°C, and then dropwise add 0.2 parts of Concentration is 10% redox system initiator, 0.1 part of mass concentration is 10% azo initiator system to carry out reaction synthesis, after stirring for 3 hours, make copolymer solution, obtain retarder solution;

[0040] Among them, the unsaturated carboxylic acid monomer is itaconic acid; the non-ionic macromonomer is isoprenyl polyethylene glycol ether; the redox initiator is potassium persulfate; the azo initiator is azodiiso Butamidine hydrochloride.

Embodiment 2

[0042] This embodiment provides a kind of retarder for weakly dispersed early-strength oil well cement and its preparation method, comprising the following steps, by weight, 30 parts of AMPS, 15 parts of unsaturated carboxylic acid monomer, 8 parts of acrylamide 1. Add water to 5 parts of non-ionic macromonomer, stir until completely dissolved, add 0.1 part of sodium hydroxide solution with a mass concentration of 30% to adjust the pH to 5, stir evenly and heat up to 75°C, and then dropwise add 0.2 parts of Concentration is 10% redox system initiator, 0.1 part of mass concentration is 10% azo initiator system to carry out reaction synthesis, after stirring for 3 hours, make copolymer solution, obtain retarder solution;

[0043] Among them, the unsaturated carboxylic acid monomer is acrylic acid; the nonionic macromer is α-methallyl-ω-methoxy; the redox initiator is ammonium persulfate and sodium bisulfite; The agent is azodiisopropylimidazoline hydrochloride.

Embodiment 3

[0045] This embodiment provides a weakly dispersed early-strength type oil well cement retarder and its preparation method, comprising the following steps, by weight, 15 parts of AMPS, 25 parts of unsaturated carboxylic acid monomer, 10 parts of acrylamide 1. Add water to 15 parts of non-ionic macromonomer, stir until completely dissolved, then add 0.1 part of sodium hydroxide solution with a mass concentration of 30% to adjust the pH to 4.5, stir evenly and heat up to 80°C, then add 0.3 parts of Concentration is 10% redox system initiator, 0.2 parts of mass concentration is 10% azo initiator system for reaction synthesis, after stirring for 3 hours, a copolymer solution is prepared, which is a retarder solution;

[0046] Among them, the unsaturated carboxylic acid monomer is fumaric acid; the non-ionic macromonomer is ω-hydroxy polyethylene glycol; the redox initiator is potassium persulfate; the azo initiator is azodiisopropylimidazole Phenyl hydrochloride.

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Abstract

The invention discloses a weak-dispersion early-strength retarder for oil well cement and a preparation method thereof, and belongs to the technical field of oil field chemicals and additives for oil well cement well cementation. The weak-dispersion early-strength retarder for the oil well cement comprises the following components in percentage by weight: 5-30% of AMPS, 5-30% of an unsaturated carboxylic acid monomer, 1-10% of acrylamide, 1-15% of a nonionic macromonomer and the balance of water. The weak-dispersion early-strength retarder is high in temperature resistance, and the normal slurry flow state of the cement paste within the range of 100-150 DEG C can be guaranteed; the thickening time has a good dosage linear relation, and the stability of the cement paste and the low-temperature top strength development of set cement are not affected; and the comprehensive performance is good, and the actual construction requirements of high-temperature deep wells and complex wells are met.

Description

technical field [0001] The invention belongs to the technical field of oilfield chemicals and admixtures for oil well cement well cementing, and in particular relates to a retarder for weakly dispersed early strength oil well cement and a preparation method thereof. Background technique [0002] Retarder is an additive that reduces the hydration speed and heat of hydration of cement or gypsum, and prolongs the setting time. The retarder for oil well cement is one of the three main ingredients in the cementing admixture, and occupies an important position in the cementing industry. From the perspective of molecular weight or synthesis method, it can be divided into two categories: organic retarders and polymer retarders. Among organic retarders, organic phosphonic acid (salt) is the most researched organic substance. There are many varieties suitable for oil well cement retarders, and there are application examples at home and abroad. Polymer retarders are the most research...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/58C08F222/02C08F220/56C08F220/06C08F4/40C04B24/16C04B103/22
CPCC08F283/065C08F283/06C08F4/40C04B24/165C04B2103/22C08F220/585C08F222/02C08F220/56C08F220/06
Inventor 罗庆李勇唐昌强
Owner 成都欧美克石油科技股份有限公司
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