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Cross-linking agent, preparation method and application thereof

A technology of cross-linking agent and silane coupling agent, which is used in chemical instruments and methods, earth-moving drilling, wellbore/well components, etc., to achieve the effect of increasing cross-linking points, wide source of raw materials and strong temperature resistance

Active Publication Date: 2021-06-25
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The nano-spherical cross-linking agents prepared by the above methods can improve the cross-linking efficiency to a certain extent, but there is still room for improvement

Method used

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  • Cross-linking agent, preparation method and application thereof
  • Cross-linking agent, preparation method and application thereof

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Embodiment 1

[0048] The present embodiment provides a kind of preparation method of crosslinking agent, comprises the following steps:

[0049] 1. Add 3.4g of cetyltrimethylammonium chloride into 100ml of sodium metaaluminate solution with a mass concentration of 40%, and stir at 60°C for 20min to form a homogeneous solution A.

[0050] 2. Add 5.6g of cetyltrimethylammonium chloride into 25ml of 30% hydrogen peroxide solution, and stir at 60°C for 20min to form a homogeneous solution B.

[0051] 3. Add 20ml of solution B dropwise to 90ml of stirring solution A at a rate of 2ml / min. After the addition is complete, let stand for reaction for 24 hours to obtain the reacted system.

[0052]4. Filter the reacted system, wash the precipitate with deionized water for 5 times, then dry the precipitate in a constant temperature drying oven at 120°C for 10 hours, then place it in a muffle furnace and calcinate at 600°C for 2.5 hours to obtain nanorod-shaped oxide aluminum.

[0053] 5. Taking the t...

Embodiment 2

[0062] The present embodiment provides a kind of preparation method of crosslinking agent, comprises the following steps:

[0063] 1. Add 4.5g of cetyltrimethylammonium bromide into 100ml of sodium metaaluminate solution with a mass concentration of 46%, and stir at 70°C for 10min to form a homogeneous solution A.

[0064] 2. Add 5 g of cetyltrimethylammonium chloride into 18 ml of 30% hydrogen peroxide solution, and stir at 60° C. for 10 min to form a homogeneous solution B.

[0065] 3. Add 16ml of solution B dropwise to 90ml of solution A under stirring at a rate of 3ml / min. After the addition is complete, let stand for reaction for 28 hours to obtain the reacted system.

[0066] 4. Filter the system after the reaction in step 3, wash the precipitate with deionized water for 3 times, then dry the precipitate in a constant temperature drying oven at 100°C for 12h, then place it in a muffle furnace and calcinate at 700°C for 1.5h to obtain Nanorod alumina.

[0067] 5. Taking...

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Abstract

The invention provides a cross-linking agent, a preparation method and application thereof. The cross-linking agent is prepared by grafting boric acid ester and titanate onto surface-modified nano rod-shaped aluminum oxide. The invention further provides application of the cross-linking agent in tight sandstone reservoir fracturing with the well temperature not higher than 140 DEG C. The cross-linking agent provided by the invention can improve the cross-linking efficiency with the guanidine gum, greatly reduce the dosage of the guanidine gum, reduce the cost and relieve the damage to a reservoir, and has the advantages of higher temperature resistance, simple preparation process, low cost of raw materials and wide sources of raw materials.

Description

technical field [0001] The invention relates to the technical field of fracturing fluids for petroleum development, in particular to a crosslinking agent and its preparation method and application. Background technique [0002] As each oilfield enters the late stage of development, low-permeability, tight and other low-grade oil reservoirs have gradually become the subject of production replacement by oilfield companies. These low-grade oil reservoirs mainly rely on fracturing measures to achieve effective development, but such reservoirs have extremely poor pore-permeability properties. Poor, the requirements for fracturing fluid are extremely high, and the performance of fracturing fluid directly determines the stimulation effect of the target well. For now, guar gum fracturing fluid will still occupy a dominant position in the market for a long time, but the use of high concentration guar gum not only easily causes damage to the reservoir, but also leads to high unit cost...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68E21B43/26
CPCC09K8/685E21B43/26
Inventor 郭琳李玉印张晨曦刘强曾双红关伟王硕赵烨
Owner PETROCHINA CO LTD
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