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

A water-based epoxy resin, oil well cement technology, applied in chemical instruments and methods, drilling compositions, etc., can solve problems such as high brittleness of cement stone, simplify steps, improve compactness and high brittleness, and avoid construction safety. hidden effect

Active Publication Date: 2022-05-13
SOUTHWEST PETROLEUM UNIV
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  • 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-crosslinking waterborne epoxy resin for oil well cement
  • High temperature resistant self-crosslinking waterborne epoxy resin for oil well cement
  • High temperature resistant self-crosslinking 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-crosslinking water-based epoxy resin for oil well cement. The preparation method steps are as follows: (1) dissolving the epoxy resin in N,N-dimethylformamide, feeding in nitrogen, and stirring Heat up to 85°C; (2) Dissolve benzoyl peroxide in acetone, then add the acetone solution dropwise to the solution in step (1), raise the temperature to 95°C, and keep the temperature constant for 30 minutes; (3) Add to the reaction solution Slowly add a mixed aqueous solution of 2-acrylamido-2-methylpropanesulfonic acid and acrylamide; constant temperature reaction for 4h; (4) rotary evaporation to remove solvent, use ethyl acetate to repeatedly wash to remove unreacted epoxy resin raw material, to obtain Self-crosslinking waterborne epoxy resin. The self-crosslinking water-based epoxy resin of the invention is added to the cement to simplify the on-site slurry mixing step; it can improve the brittleness characteristics of the oil well cement stone, and effectively improve the macroscopic mechanical properties and compactness of the oil well cement stone.

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 Patents(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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