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A kind of shale stabilizer and preparation method thereof

A stabilizer and mud shale technology, which is applied in the field of mud shale stabilizer and its preparation, can solve the problems of high concentration, difficult to take into account at the same time, single action form, etc., to achieve improved dispersion stability, controllable synthesis conditions, principle reliable effect

Active Publication Date: 2019-06-04
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above-mentioned different types of inhibitors have achieved good application effects to a certain extent, they still have different limitations, such as high concentrations of inorganic salts and organic salts, and insufficient temperature resistance of low-molecular organic amines.
[0006] In summary, it can be seen that the current shale stabilizers have a single action form, and it is often difficult to balance physical plugging and chemical inhibition at the same time; and the interaction between some shale stabilizers and shale is weak, and the Short time limit, unable to exert long-term stabilizing effect

Method used

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  • A kind of shale stabilizer and preparation method thereof
  • A kind of shale stabilizer and preparation method thereof
  • A kind of shale stabilizer and preparation method thereof

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preparation example Construction

[0054] The present invention also relates to a kind of preparation method of the nano-silica modified by dendrimers, comprising the steps of:

[0055] (1) Dry the nano silicon dioxide in a vacuum drying oven, then cool to room temperature, and place it in a desiccator for later use.

[0056] Wherein, the drying temperature of the vacuum drying oven is 100-120° C., and the drying time is more than 12 hours.

[0057] (2) Add dry nano silicon dioxide into anhydrous organic solvent, and ultrasonically disperse to obtain a uniform suspension.

[0058] Wherein, the organic solvent may be anhydrous toluene; the nano silicon dioxide is 1-6w / v% of the solvent.

[0059] (3) Put the suspension obtained in step (2) into a flask, add a silane coupling agent, stir under a nitrogen atmosphere, and heat to react to obtain a first mixture.

[0060] Wherein, the mass ratio of the silane coupling agent to the nano-silicon dioxide is 1:1 to 5:1; the heating reaction is to react at 50 to 100°C f...

Embodiment 1

[0069] (1) Place nano-silica with a particle size of 12nm in a vacuum drying oven at 105°C for 12 hours, then cool to room temperature, and place in a desiccator for later use;

[0070] (2) Add 250mL of anhydrous toluene and 10g of dry nano-silica in a beaker, and use SB-3200DT ultrasonic cleaner to disperse ultrasonically for 30min at room temperature to obtain a uniform suspension;

[0071] (3) Put the suspension obtained in step (2) into a four-necked flask with a stirrer, condenser, thermometer and nitrogen gas guide tube, add 15g of silane coupling agent β-(3,4 epoxycyclohexyl) Ethyltrimethoxysilane (purchased from Shanghai Aladdin Biochemical Technology Co., Ltd., commercial name is A-186), stirred under a nitrogen atmosphere, the stirring speed was set at 800rpm, heated to 95°C by a water bath and maintained at a stable temperature , reacted for 2h to obtain the first mixture;

[0072] (4) The first mixture obtained in step (3) is washed with ethanol, centrifuged 3 tim...

Embodiment 2

[0076] (1) Put the nano-silica with a particle size of 5nm in a vacuum drying oven at 105°C for 12 hours, then cool to room temperature, and put it in a desiccator for later use;

[0077] (2) Add 250mL of anhydrous toluene and 10g of dry nano-silica in a beaker, and use SB-3200DT ultrasonic cleaner to disperse ultrasonically for 30min at room temperature to obtain a uniform suspension;

[0078] (3) Put the suspension obtained in step (2) into a four-necked flask with a stirrer, condenser, thermometer and nitrogen gas guide tube, add 20g of silane coupling agent γ-glycidyl ether oxypropyl trimethoxy Silane (purchased from Shanghai Aladdin Biochemical Technology Co., Ltd., commercial name is KH-560), stirred under a nitrogen atmosphere, the stirring speed was set at 100rpm, heated to 90°C in a water bath and kept at a stable temperature, reacted for 2h, and obtained the first mixture;

[0079] (4) The first mixture obtained in step (3) is washed with ethanol, centrifuged 3 time...

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Abstract

The invention discloses a mud shale stabilizer. The mud shale stabilizer is acquired through the reaction of a silane coupling agent modified nanosilicon dioxide and a dendritic polymer. The inventionfurther provides a preparation method of the mud shale stabilizer. The mud shale stabilizer is prepared through the method. The hardness and softness combined physical blocking is realized with the help of the rigid blocking of the nanosilicon dioxide and the deformation filling of the nanoscale dendritic polymer, moreover, the strong absorption between a large quantity of end groups and the surface of the mud shale inhibits the hydration and swelling of the mud shale to achieve efficient chemical inhibition. The mud shale stabilizer achieves the double functions of the nanoscale physical blocking and the chemical inhibition, a new way and method is provided for the stabilizing the mud shale, and the mud shale stabilizer is of great theoretical significance and has an important application value.

Description

technical field [0001] The invention belongs to the field of petroleum engineering and oilfield chemistry, and in particular relates to a mud shale stabilizer and a preparation method thereof. Background technique [0002] In drilling engineering, a series of downhole complex situations such as well wall collapse, pipe sticking and lost circulation caused by shale well wall instability have always been a worldwide engineering technical problem that plagues drilling engineering and needs to be solved urgently. When water-based drilling fluid is used to drill shale formations, under the effects of hydraulic pressure difference and chemical potential difference, there is pressure transfer and filtrate intrusion between the drilling fluid and the wellbore shale. Since the pore pressure cannot be transmitted quickly, The entry of a small amount of water will lead to a significant increase in pore pressure, which in turn will cause a decrease in the effective support stress of the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G83/00C09K8/035
CPCC08G83/001C09K8/035C09K2208/12
Inventor 钟汉毅邱正松张馨汤志川赵欣黄维安刘均一张现斌
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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