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Water-absorbent material and preparation method and application thereof

A technology of water-absorbing materials and reactors, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of strong water-absorbing materials that are not resistant to salt, easy to degrade and temperature resistance, etc., to increase salt resistance and prevent resin The effect of degradation and molecular cross-linking uniformity

Active Publication Date: 2016-08-10
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a water-absorbing material, which has high water absorption rate, strong resistance to degradation, and strong resistance to high-salt and high-temperature environments, and solves the problem that the existing strong water-absorbing materials added in well killing fluids cannot tolerate salt and are easy to degrade And the technical problem of poor temperature resistance, at the same time, the water-absorbing material has a certain viscosity after absorbing water, so that the plugging effect is improved when it is applied in the killing fluid

Method used

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  • Water-absorbent material and preparation method and application thereof

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Effect test

Embodiment 1

[0033] In this embodiment, the raw material composition of the water-absorbing material and the weight percentage of each component are as follows:

[0034] Acrylic acid: 27% to 33%;

[0035] Potassium hydroxide: 17% to 21%;

[0036] Acryloylmorpholine: 1% to 2%;

[0037] Composite crosslinking agent: 1% to 2%;

[0038] Silicon dioxide: 0.2% to 0.3%;

[0039] Tackifier: 0.04% to 0.06%;

[0040] Deionized water: 41% to 54%;

[0041] Initiator: 0.1% to 0.3%;

[0042] And the mass ratio of the acrylic acid to the potassium hydroxide is 50:31.

[0043] Concrete preparation process is as follows:

[0044] First, the tackifier is prepared;

[0045] Add 300g of acrylamide to 500g of deionized water, then add 30g of AMPS, adjust the temperature to 25°C, add 5g of initiator, after the reaction is completed, granulate and dry and crush at 70°C to obtain a tackifier.

[0046] Then, figure 1 It is a schematic flow chart of the preparation method of the water-absorbing material o...

Embodiment 2

[0056] In this embodiment, the raw material composition and the weight of each component of the water-absorbing material are as follows:

[0057] Acrylic acid: 100g;

[0058] Potassium hydroxide: 62g;

[0059] Acryloylmorpholine: 5g;

[0060] Composite crosslinking agent: 5g;

[0061] Silicon dioxide: 1g;

[0062] Viscosifier: 0.2g;

[0063] Deionized water: 190g;

[0064] Initiator: 0.5g;

[0065] Specifically, the preparation process is as follows:

[0066] First, the tackifier is prepared;

[0067] Add 300g of acrylamide to 500g of deionized water, then add 30g of AMPS, adjust the temperature to 25°C, add 5g of initiator, after the reaction is completed, granulate and dry and crush at 70°C to obtain a tackifier.

[0068] Then, add 100g of acrylic acid, 190g of deionized water into the reactor, and then add 62g of potassium hydroxide for neutralization reaction, then add 5g of acryloyl morpholine, 5g of composite crosslinking agent, 1g of silicon dioxide, the above-m...

Embodiment 3

[0074] In this embodiment, the raw material composition and the weight of each component of the water-absorbing material are as follows:

[0075] Acrylic acid: 150g;

[0076] Potassium hydroxide: 93g;

[0077] Acryloylmorpholine: 7g;

[0078]Composite crosslinking agent: 7g;

[0079] Silicon dioxide: 1.5g;

[0080] Viscosifier: 0.4g;

[0081] Deionized water: 280g;

[0082] Initiator: 1g;

[0083] Specifically, the preparation process is as follows:

[0084] First, the tackifier is prepared;

[0085] Add 300g of acrylamide to 500g of deionized water, then add 30g of AMPS, adjust the temperature to 25°C, add 5g of initiator, after the reaction is completed, granulate and dry and crush at 70°C to obtain a tackifier.

[0086] Then, add 150g of acrylic acid, 280g of deionized water into the reactor, then add 93g of potassium hydroxide for neutralization reaction, then add 7g of acryloyl morpholine, 7g of composite crosslinking agent, 1.5g of silicon dioxide, 0.4g of the a...

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Abstract

The invention provides a water-absorbent material and a preparation method and an application thereof. The water-absorbent material comprises, by mass percentage, 27-33% of acrylic acid, 17-21% of potassium hydroxide, 1-2% of acryloyl morpholine, 1-2% of a composite cross-linking agent, 0.2-0.3% of silica, 0.04-0.06% of a tackifier, 0.2-0.3% of 2-acrylamide-2-methylpropanesulfonic acid (AMPS), 41-54% of deionized water, and 0.1-0.3% of an initiator, wherein the mass ratio of acrylic acid to potassium hydroxide is 50:31. Through the provided water-absorbent material, the technical problem that a strong water-absorbent material added in a conventional kill fluid cannot resist salt, is prone to degrade, and is poor in temperature resistance is solved, and the water-absorbent material has a certain viscosity and a compression shielding function after water absorbance, thereby achieving the purpose of leakage protection. The effect of leakage protection is improved, when the water-absorbent material is applied to the kill fluid.

Description

technical field [0001] The invention relates to the technical field of oilfield additives, in particular to a water-absorbing material for a low-pressure harmless well killing fluid and a preparation method and application thereof. Background technique [0002] In oil and natural gas workover and well killing operations, lost circulation often occurs. Among them, lost circulation refers to the loss of various working fluids (including Drilling fluid, cement slurry, killing fluid and other liquids) leak into the formation under the action of differential pressure. This is the most common and common problem in the drilling and production process with serious losses. It is necessary to effectively protect the wall to stop leakage, and to prevent various working fluids from leaking into the production layer and causing damage to the production layer. [0003] At present, in order to plug the low-pressure gas well, the widely used killing fluid is the strong water-absorbing temp...

Claims

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Application Information

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IPC IPC(8): C08F265/10C08F220/06C08F226/06C08F220/56C08F220/58C08F2/44C08K3/36C08J3/24C09K8/88
Inventor 李慧薛建强李琼玮奚运涛孙雨来董晓焕张鑫柱程碧海朱方辉李明星
Owner PETROCHINA CO LTD
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