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Aluminum-titanium composite cross-linking agent, preparation method and application thereof, and guar gum acidic fracturing fluid system

A composite cross-linking agent, aluminum-titanium technology, applied in chemical instruments and methods, drilling compositions, etc., can solve problems such as increased pipeline friction, poor temperature resistance of fracturing fluid, and short cross-linking time

Active Publication Date: 2022-04-01
昆山京昆油田化学科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The guar gum acidic crosslinking agent in the prior art is generally synthesized from small molecular aluminum salts or zirconium salts, and the crosslinking time is usually relatively short, and a high-viscosity jelly will be formed quickly during the pumping process, resulting in The frictional resistance of the pipeline rises rapidly, and the formed fracturing fluid has poor temperature resistance

Method used

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  • Aluminum-titanium composite cross-linking agent, preparation method and application thereof, and guar gum acidic fracturing fluid system
  • Aluminum-titanium composite cross-linking agent, preparation method and application thereof, and guar gum acidic fracturing fluid system
  • Aluminum-titanium composite cross-linking agent, preparation method and application thereof, and guar gum acidic fracturing fluid system

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preparation example Construction

[0032] The present invention also provides a preparation method of the aluminum-titanium composite crosslinking agent described in the above technical scheme, comprising the following steps:

[0033] Mix water, organic acid, triethanolamine and inorganic polymer aluminum salt for the first coordination reaction to obtain polymer aluminum coordination products;

[0034] Mix titanate and triethanolamine for a second coordination reaction to obtain a titanium coordination product;

[0035] The titanium coordination product, the polymer aluminum coordination product and acetic acid are mixed to obtain the aluminum-titanium composite crosslinking agent.

[0036] The invention mixes water, organic acid, triethanolamine and inorganic macromolecular aluminum salt to carry out the first coordination reaction to obtain a macromolecular aluminum coordination product.

[0037] The present invention preferably first mixes the inorganic polymer aluminum salt with water, then adds the triet...

Embodiment 1

[0052] (1) Place a 2500mL three-necked flask in a water bath at 50°C to keep the temperature constant, add 600g of water to the three-necked flask, weigh 100g of polyaluminum chloride and dissolve it in water, add 50g of triethanolamine under magnetic stirring conditions, and add 50g of it after 1 hour of reaction Lactic acid, continue to stir for 1 hour to obtain the polymer aluminum coordination product;

[0053](2) Place a 250mL three-neck flask in a water bath at 50°C to keep the temperature constant, add 30g of tetraisopropyl titanate and 30g of triethanolamine to the three-necked flask in turn, mix and stir for 2 hours to obtain a titanium coordination product;

[0054] (3) Add the product obtained in step (2) to the product obtained in step (1), then add 140 g of acetic acid, and mix evenly to obtain a high molecular weight aluminum-titanium composite crosslinking agent for guar gum acidic fracturing fluid system.

Embodiment 2

[0063] Prepare 100mL of 0.55wt% carboxymethyl hydroxypropyl guar gum base liquid, let it stand for 2h, add 0.4wt% aluminum-titanium composite crosslinking agent prepared in Example 1, 0.3wt% clay stabilizer, 0.3wt% drainage aid agent, the pH value of the prepared guar gum acidic fracturing fluid system is 4.5, and the gel crosslinking time is 200s. The cross-linking agent played the role of significantly delaying the cross-linking time.

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Abstract

The invention provides an aluminum-titanium composite cross-linking agent, a preparation method and application thereof and a guar gum acidic fracturing fluid system, and belongs to the technical field of cross-linking agents. The invention provides an aluminum-titanium composite cross-linking agent which is prepared from the following raw materials in parts by weight: 1-15 parts of inorganic polymer aluminum salt, 1-5 parts of titanate, 1-10 parts of organic acid, 1-15 parts of triethanolamine, 1-15 parts of acetic acid and 50-80 parts of water, and the organic acid is lactic acid, tartaric acid or gluconic acid. According to the invention, inorganic polymer aluminum salt, titanate and various ligands (organic acid and triethanolamine) are subjected to a coordination (complexing) reaction to form a polymer aluminum-titanium composite cross-linking agent, so that the molecular size of the cross-linking agent can be increased, the use concentration of guar gum in the acidic fracturing fluid is effectively reduced, the cross-linking time is delayed, and the temperature resistance and shear resistance of the fracturing fluid are improved.

Description

technical field [0001] The invention relates to the technical field of crosslinking agents, in particular to an aluminum-titanium composite crosslinking agent, a preparation method and application thereof, and a guar gum acidic fracturing fluid system. Background technique [0002] Acidic fracturing fluid is one of the important stimulation measures aimed at stimulating carbonate rock (including limestone, dolomite, dolomitic limestone, etc.) reservoirs. The acidic environment can effectively inhibit the expansion and migration caused by the negative charge of the clay surface, and reduce the damage to the reservoir, which is of great significance to the continuous increase of oil and gas field development. [0003] The guar gum acidic crosslinking agent in the prior art is generally synthesized from small molecular aluminum salts or zirconium salts, and the crosslinking time is usually relatively short, and a high-viscosity jelly will be formed quickly during the pumping pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68
Inventor 朱明山胡传智吴志明彭树华王雪稳宫大军邓明宇谢文龙袁哲
Owner 昆山京昆油田化学科技有限公司
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