Dendritic organic boron crosslinker as well as preparation method and application thereof

A dendritic and organoboron technology, applied in the direction of organic chemistry, chemical instruments and methods, drilling compositions, etc., can solve the problem of short delay time

Active Publication Date: 2018-06-29
昆山京昆油田化学科技有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The organoboron crosslinking agent prepared in the prior art has the problem of short delay time, and the delay time is only 180s at the highest

Method used

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  • Dendritic organic boron crosslinker as well as preparation method and application thereof
  • Dendritic organic boron crosslinker as well as preparation method and application thereof
  • Dendritic organic boron crosslinker as well as preparation method and application thereof

Examples

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preparation example Construction

[0022] The invention provides a kind of preparation method of dendritic organic boron crosslinking agent, comprises the following steps:

[0023] (1) Under the protection of argon, the compound having the structure shown in formula I is polymerized with glycidol to obtain dendritic polyhydroxy macromolecules,

[0024]

[0025] (2) Under the condition that the pH value is 11-13, the dendritic polyhydroxy macromolecule obtained in the step (1) is reacted with a boron-containing compound to obtain a dendritic organoboron crosslinking agent.

[0026] In the present invention, under the protection of argon, the compound having the structure shown in formula I is polymerized with glycidol to obtain dendritic polyhydroxy macromolecules. The present invention has no special limitation on the source of the compound shown in formula I, and it can be prepared by using commercially available products or conventional preparation methods well known to those skilled in the art, such as re...

Embodiment 1

[0042] In a three-necked flask, 0.67 mL of a methanol solution of potassium methoxide (mass concentration 25%) and 1.2 g of trimethylolpropane were mixed and stirred evenly, and the methanol was distilled off under reduced pressure. Install mechanical stirring, place the three-necked bottle in an oil bath, fill it with high-purity argon, and heat it to 95°C. Add organic solvent dioxane 120mL. Then add 120 mL of glycidol monomer, after 12 hours of reaction, add excess methanol to dilute. The diluted mixed liquor is treated with cation exchange resin. The product is then precipitated out using excess acetone to yield dendritic polyhydroxy macromolecules.

[0043]Mix 5 g of dendritic polyhydroxy macromolecules with 5 g of water to obtain an aqueous solution of dendritic polyhydroxy macromolecules, then mix 15 g of boric acid with 100 g of water to obtain an aqueous solution of boric acid, mix the aqueous solution of dendritic polyhydroxy macromolecules with an aqueous solution ...

Embodiment 2

[0047] The steps for preparing dendritic polyhydroxy macromolecules are the same as in Example 1.

[0048] Mix 5 g of dendritic polyhydroxy macromolecules with 5 g of water to obtain an aqueous solution of dendritic polyhydroxy macromolecules, then mix 5 g of boric acid with 100 g of water to obtain an aqueous solution of boric acid, mix the aqueous solution of dendritic polyhydroxy macromolecules with an aqueous solution of boric acid, and use hydrogen Sodium oxide solution adjusts the pH value of the system to 13, heats to 60° C. for reaction for 1 h, distills and concentrates the reaction product under reduced pressure, adds salt to precipitate a solid product, separates the precipitate, and dries to obtain a dendritic organoboron crosslinking agent.

[0049] Prepare 100 mL of 0.45% guar gum base solution, let it stand for 2 hours, and adjust the pH to 11.0; add 0.1 mL (mass concentration: 3.5%) of the above-mentioned dendritic organoboron cross-linking agent solution, and d...

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Abstract

The invention provides a dendritic organic boron crosslinker, and belongs to the technical field of organic boron crosslinkers. The dendritic organic boron crosslinker is characterized in that dendritic polyhydroxyl macromolecules are used as a complexing agent, the dendritic polyhydroxyl macromolecules have a spherical structure, and hydroxyl groups are distributed on the surface of a spherical shell and the inner part of a spherical body. Both two kinds of hydroxyl groups can participate in complexing of boron atoms in boron-containing compound. For the boron atoms in complexing at the innerpart of the spherical body, the boron atoms can also be complexed with other hydroxyl groups in the spherical body during a diffusion process even the boron atoms diffuse outside the spherical body due to dissociation, so that the diffusion speed is greatly reduced. Compared with a traditional micromolecular complexing agent, crosslinking of the boron atoms with other components in fracturing liquid is further delayed by the dendritic polyhydroxyl macromolecules, and an effect of reducing construction frictional resistance is more obvious; data of the embodiment show that the delayed crosslinking time of the dendritic organic boron crosslinker prepared by the invention is up to 350 seconds.

Description

technical field [0001] The invention relates to the technical field of organic boron crosslinking agents, in particular to a dendritic organic boron crosslinking agent and its preparation method and application. Background technique [0002] Hydraulic fracturing has become an important technical means for the development of unconventional oil and gas fields and the increase and stability of conventional oil and gas fields. The jelly system formed by crosslinking guar gum with boric acid or boric acid derivatives has many advantages and is a commonly used hydraulic fracturing fluid. However, the cross-linking time between guar gum and boric acid or boric acid derivatives is usually relatively short, and high-viscosity jelly will be formed quickly during the pumping process, resulting in a rapid increase in pipeline friction, increasing the wellhead pressure for construction, and bringing High construction risk. Therefore, it is necessary to form a complex between borate and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07F5/04C09K8/68C09K8/90
CPCC07F5/04C09K8/685C09K8/90
Inventor 李博
Owner 昆山京昆油田化学科技有限公司
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