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Water-absorbing material and its preparation method and application

A water-absorbing material and reactor technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of easily degradable temperature resistance, strong water-absorbing materials cannot withstand salt, etc., to prevent resin degradation and increase salt resistance. performance, the effect of preventing degradation

Active Publication Date: 2018-06-01
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-absorbing material and its preparation method and application

Examples

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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, prepare a tackifier;

[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-mention...

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, prepare a tackifier;

[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 above-p...

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Abstract

The invention provides a water-absorbing material and its preparation method and application. The mass percentage of the water-absorbing material is composed of: 27%-33% of acrylic acid, 17%-21% of potassium hydroxide, 1%-2% of acryloylmorpholine, Composite crosslinking agent 1%‑2%, silica 0.2%‑0.3%, tackifier 0.04%‑0.06%, 2‑acrylamide‑2‑methylpropanesulfonic acid AMPS 0.2%‑0.3%, deionized water 41%-54%, initiator 0.1%-0.3%, and the mass ratio of the acrylic acid to the potassium hydroxide is 50:31, the water-absorbing material provided by the present invention solves the problem of adding in the existing killing fluid The strong water-absorbent material has technical problems of not being able to withstand salt, is easy to degrade, and has poor temperature resistance. At the same time, the water-absorbing material has a certain viscosity and compression shielding effect after absorbing water, and realizes the purpose of plugging, thereby improving plugging when used in well killing fluid. leaking effect.

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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Patent Type & Authority Patents(China)
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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