High-temperature-resistant self-cross-linking waterborne epoxy resin for oil well cement

A technology of water-based epoxy resin and oil well cement, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., and can solve the problem of high brittleness of cement stone

Active Publication Date: 2021-09-14
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The water-based epoxy resin has stable construction performance, can withstand the high temperature environment of the formation, and can improve the problem of high brittleness of cement stone

Method used

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  • High-temperature-resistant self-cross-linking waterborne epoxy resin for oil well cement
  • High-temperature-resistant self-cross-linking waterborne epoxy resin for oil well cement
  • High-temperature-resistant self-cross-linking waterborne epoxy resin for oil well cement

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Embodiment 1

[0029] A preparation method of high temperature resistant self-crosslinking water-based epoxy resin for oil well cement, the steps are as follows:

[0030] (1) 105g of epoxy resin E44 is dissolved in 135g of N,N-dimethylformamide, transferred to a three-necked flask with a condenser tube and a constant pressure dropping funnel, fed with nitrogen, stirred by a magnetic stirrer and Heating to 85°C;

[0031] (2) Using 4g of benzoyl peroxide as an initiator, dissolve benzoyl peroxide in 11g of acetone, then add the acetone solution dropwise into a three-necked flask, raise the temperature of the system to 95°C, and react at a constant temperature for 30min;

[0032] (3) 45g of 2-acrylamido-2-methylpropanesulfonic acid (AMPS) and 5g of acrylamide (AM) were dissolved in 40g of water to form a mixed aqueous solution; then the mixed aqueous solution was slowly added to a three-necked flask and kept at a constant temperature Reaction 4h;

[0033] (4) After the reaction, the solvent w...

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Abstract

The invention discloses a high-temperature-resistant self-cross-linking water-borne epoxy resin. The preparation method comprises the following steps: (1) dissolving an epoxy resin in N, N-dimethylformamide, introducing nitrogen, stirring and heating to 85 DEG C; (2) dissolving benzoyl peroxide in acetone, dropwise adding the acetone solution into the solution obtained in the step (1), heating to 95 DEG C, and keeping the temperature for 30 minutes; (3) slowly adding a mixed aqueous solution of 2-acrylamido-2-methylpropanesulfonic acid and acrylamide into the reaction solution, and performing constant-temperature reaction for 4 hours; and (4) carrying out rotary evaporation to remove the solvent, and repeatedly washing with ethyl acetate to remove the unreacted epoxy resin raw material to obtain the self-cross-linking waterborne epoxy resin. According to the invention, the self-cross-linking water-borne epoxy resin is added into cement, so that the on-site slurry preparation step is simplified; and the brittleness characteristic of the oil well set cement can be improved, and the macroscopic mechanical property and compactness of the oil well set cement are effectively improved.

Description

technical field [0001] The invention relates to the technical field of oil and gas field exploitation, in particular to a high-temperature-resistant self-crosslinking water-based epoxy resin for oil well cement. Background technique [0002] Well cementing is an operation that injects cement slurry between the casing and the formation annulus. After the cement slurry solidifies, oil well cement is formed to effectively isolate the formation and provide protection and support for the casing. The cementing quality is good It is critical for subsequent drilling and oil and gas extraction. With the deepening of exploration of oil and gas resources, the formations encountered become more and more complex, which brings more severe tests to the quality of cementing. Traditional Portland cement is a kind of congenitally brittle material, which is easy to shrink and has poor cementation. Moreover, the difference in formation temperature, casing expansion, soft and hard formation pre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/10C08F220/56C08F220/58C09K8/467
CPCC08F283/10C09K8/467C08F220/56C08F220/585
Inventor 彭志刚冯茜郑勇周征艳吕法林
Owner SOUTHWEST PETROLEUM UNIV
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