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Salt-resistant thickener and salt-resistant recyclable fracturing fluid containing the salt-resistant thickener

A thickening agent and fracturing fluid technology, applied in drilling compositions, chemical instruments and methods, etc., can solve the problems of crops and surface water pollution in the surrounding environment, achieve good salt resistance, reduce risks, and maintain ecological effects of the environment

Active Publication Date: 2018-04-06
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, most of the fracturing fluids are used for one-time use and then flow back. The residual liquid contains muscle glue, formaldehyde, petroleum and other additives. Because there is no effective treatment method, almost all oil fields are used in remote areas of oil fields. Digging pools for centralized storage of soil will cause pollution to the surrounding environment, especially crops and surface water systems, which is a source of pollution that cannot be ignored in oil fields

Method used

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  • Salt-resistant thickener and salt-resistant recyclable fracturing fluid containing the salt-resistant thickener
  • Salt-resistant thickener and salt-resistant recyclable fracturing fluid containing the salt-resistant thickener
  • Salt-resistant thickener and salt-resistant recyclable fracturing fluid containing the salt-resistant thickener

Examples

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Effect test

Embodiment 1

[0039] This embodiment provides a kind of anti-salt thickener, and this anti-salt thickener is prepared through the following steps:

[0040] (1) Get 40 parts by weight of isopropanol solution as a dispersant, add 10 parts by weight of small molecule guar gum powder therein, and add 0.5 parts by weight of sodium hydroxide for alkalization, alkalization at 70-80°C 40-50min;

[0041] (2) add the sulfonic acid ester of 0.1 weight part and the propylene oxide of 5 weight parts, heat and stir and react completely;

[0042] (3) neutralize the sodium hydroxide in the solution with 0.5 parts by weight of acetic acid, and add 40 parts by weight of isopropanol solution, filter after stirring, the filtered material is washed and filtered again with isopropanol solution;

[0043] (4) Dry and pulverize at 60°C to obtain a light yellow powder, which is the anti-salt thickener.

[0044] This embodiment also provides a method for preparing a salt-resistant recyclable fracturing fluid, compr...

Embodiment 2

[0048] This embodiment provides a kind of anti-salt thickener, and this anti-salt thickener is prepared through the following steps:

[0049](1) Get 60 parts by weight of isopropanol solution as a dispersant, add 20 parts by weight of small molecule guar gum powder therein, and add 1 part by weight of sodium hydroxide for alkalization, alkalization at 70-80°C 40-50min;

[0050] (2) add the sulfonic acid ester of 1 weight part and the propylene oxide of 10 weight parts, heat and stir and react completely;

[0051] (3) neutralize the sodium hydroxide in the solution with acetic acid of 1 weight part, and add 50 parts by weight of isopropanol solution, filter after stirring, the filtered material is washed and filtered again with isopropanol solution;

[0052] (4) Dry and pulverize at 60°C to obtain a light yellow powder, which is the anti-salt thickener.

[0053] This embodiment also provides a method for preparing a salt-resistant recyclable fracturing fluid, comprising the f...

Embodiment 3

[0057] This embodiment provides a kind of anti-salt thickener, and this anti-salt thickener is prepared through the following steps:

[0058] (1) Get 50 parts by weight of isopropanol solution as a dispersant, add 10 parts by weight of small molecule guar gum powder therein, and add 0.8 parts by weight of sodium hydroxide for alkalization, alkalization at 70-80°C 40-50min;

[0059] (2) Add 0.5 parts by weight of sulfonic acid ester and 5 parts by weight of propylene oxide, heat and stir to react completely;

[0060] (3) neutralize the sodium hydroxide in the solution with the acetic acid of 0.8 weight part, and add 45 parts by weight of isopropanol solution, filter after stirring, the filtered material is washed and filtered again with isopropanol solution;

[0061] (4) Dry and pulverize at 60°C to obtain a light yellow powder, which is the anti-salt thickener.

[0062] This embodiment also provides a method for preparing a salt-resistant recyclable fracturing fluid, compris...

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Abstract

The invention provides an anti-salt thickening agent, an anti-salt type recoverable fracturing fluid containing the same, and a preparation method of the fracturing fluid. An anti-salt thickening agent aqueous solution is prepared firstly, then a thickening agent dissolving-promoting solvent is added to the anti-salt thickening agent aqueous solution to make the solution swelled, then a cleanup agent, an antiswelling agent, a cross-linking accelerant and a cross-linking agent are added, crosslinking is performed, and thus the anti-salt type recoverable fracturing fluid is prepared. The anti-salt type recoverable fracturing fluid has good anti-salt performance, can be applied in high-mineralization-degree stratum water, can be applied for secondary crosslinking after flowback treatment, and has the advantages of good temperature resistance, better viscoelasticity, low damage rate, and good compatibility after being matched with stratum water of different region blocks. The invention also provides an application of the anti-salt type recoverable fracturing fluid. The anti-salt type recoverable fracturing fluid is applied in the high-mineralization-degree stratum water, can reduce flowback of dangerous pollution sources, reduces risk of environmental pollution, reduces consumption of water resources, and has important significance on maintaining the ecological environment.

Description

technical field [0001] The invention belongs to the field of oil recovery, and relates to a salt-resistant thickener, a salt-resistant recyclable fracturing fluid containing the salt-resistant thickener, and a preparation method and application of the fracturing fluid. Background technique [0002] With the strengthening of fracturing measures at home and abroad and the expansion of scale, the recycling and reuse technology of fracturing fluid flowback technology will be an inevitable trend in the development of fracturing fluids in the future. While reducing costs and improving the benefits of measures, reducing The on-site process of fracturing measures is improved, and the progress of construction is accelerated. Therefore, the development and research of fracturing fluid recyclable reuse technology is of great significance to the development of future fracturing measures transformation technology. [0003] At present, the research trend of fracturing fluids at home and a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/68
CPCC09K8/602C09K8/665C09K8/68C09K8/685C09K8/887C09K8/90C09K2208/12
Inventor 彭继郭子义林海张成娟熊廷松张力刘世铎王俊明王国庆万有余
Owner PETROCHINA CO LTD
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