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Mud shale stabilizer and preparation method thereof

A technology of stabilizer and mud shale, 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., and achieves improved dispersion stability, controllable synthesis conditions, Reliable effect

Active Publication Date: 2018-06-22
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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  • Mud shale stabilizer and preparation method thereof
  • Mud shale stabilizer and preparation method thereof
  • Mud shale stabilizer and preparation method thereof

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preparation example Construction

[0054] The invention also relates to a preparation method of dendrimer modified nano silica, which comprises the following steps:

[0055] (1) Dry the nano-silica 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 the dried nano-silica into an anhydrous organic solvent, and ultrasonically disperse to obtain a uniform suspension.

[0058] Wherein, the organic solvent may be anhydrous toluene; the nano silica is 1 to 6 w / 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 environment, and heat to react to obtain a first mixture.

[0060] Wherein, the mass ratio of the silane coupling agent to the nano silica is 1:1 to 5:1; the heating reaction is a reaction at 50 to 100° C. for 2 to 10 hours. More preferably, the heating...

Embodiment 1

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

[0070] (2) Add 250 mL of anhydrous toluene and 10 g of dried nano-silica into the beaker, and use the SB-3200DT ultrasonic cleaner to ultrasonically disperse for 30 minutes 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, a condenser, a thermometer and a nitrogen gas tube, and add 15g of the silane coupling agent β-(3,4 epoxycyclohexyl) Ethyl trimethoxysilane (purchased from Shanghai Aladdin Biochemical Technology Co., Ltd., commercial name is A-186), stirred under nitrogen atmosphere, the stirring speed is set to 800rpm, heated to 95°C in a water bath and kept the temperature stable , React for 2h to obtain the first mixture;

[0072] (4) Wash the first mixture obtained in step (3) with ethanol, centri...

Embodiment 2

[0076] (1) Place 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 place it in a desiccator for later use;

[0077] (2) Add 250 mL of anhydrous toluene and 10 g of dried nano-silica into the beaker, and use the SB-3200DT ultrasonic cleaner to ultrasonically disperse for 30 minutes 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, a condenser, a thermometer and a nitrogen gas pipe, and add 20 g of the silane coupling agent γ-glycidyl ether oxypropyl trimethoxy Silane (purchased from Shanghai Aladdin Biochemical Technology Co., Ltd., the commercial name is KH-560), stir under nitrogen atmosphere, the stirring speed is set to 100rpm, heated to 90°C in a water bath and maintain the temperature stable, react for 2h to obtain First mixture

[0079] (4) Wash the first mixture obtained in step (3) with ethanol, centrifuge ...

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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 oilfield chemistry, and specifically relates to a shale stabilizer and a preparation method thereof. Background technique [0002] In drilling engineering, a series of complex downhole situations, such as the collapse of the well wall caused by the instability of the shale wellbore, sticking and lost circulation, has always been a worldwide engineering technical problem that has not been solved well in the drilling engineering. When water-based drilling fluid is used to drill mud shale formations, under the action of hydraulic pressure difference and chemical potential difference, there is pressure transfer and filtrate intrusion between the drilling fluid and the borehole mud shale. Because the pore pressure cannot be transmitted quickly, The entry of a small amount of water will cause a significant increase in pore pressure, which in turn will cause the effective support stress of the drilling fl...

Claims

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Application Information

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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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