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A kind of preparation method of HPAA composite pH response type bentonite

A technology of bentonite and activated bentonite, which is applied in the field of preparation of pH-responsive bentonite, can solve the problems that bentonite cannot meet site requirements, and achieve the effects of enhancing flexibility, preventing invasion of shale formations, and ensuring plugging strength

Active Publication Date: 2021-08-10
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Obviously, conventional bentonite for drilling fluid can no longer meet the site requirements

Method used

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  • A kind of preparation method of HPAA composite pH response type bentonite
  • A kind of preparation method of HPAA composite pH response type bentonite
  • A kind of preparation method of HPAA composite pH response type bentonite

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] This embodiment provides a preparation method of HPAA composite pH-responsive bentonite, the main reaction process includes the following steps:

[0028] (1) 3g of bentonite is formulated into 100mL bentonite slurry with a mass percentage of 3%, and stirred at a constant temperature of 45° C. for 12 hours to fully hydrate the bentonite;

[0029] (2) Add 1.5g of citric acid dihydrate crystals, stir at a constant temperature of 55°C for 3h, and the stirring speed is 120r·min -1 ; Add 2.1g of silane coupling agent KH570 and stir for 11 hours at an ultrasonic frequency of 100KHz and a temperature of 65-70°C;

[0030] (3) After the reaction, the obtained activated bentonite slurry was centrifuged and washed to neutrality, then placed in a constant temperature drying oven at 80° C. for 24 hours, and then pulverized to 500-800 nm with a nano pulverizer to obtain activated bentonite;

[0031] (4) Take 2g of activated bentonite, add distilled water, and stir at 45°C for 24 hour...

Embodiment 2

[0034] This embodiment provides a preparation method of HPAA composite pH-responsive bentonite, the main reaction process is as follows figure 1 shown, including the following steps:

[0035] (1) 3g of bentonite is formulated into 100mL bentonite slurry with a mass percentage of 3%, and stirred at a constant temperature of 45° C. for 12 hours to fully hydrate the bentonite;

[0036] (2) Add 10g of citric acid dihydrate crystals, stir at a constant temperature of 55°C for 3h, and the stirring speed is 120r·min -1 ; Then add 5g of silane coupling agent KH570 and stir for 11 hours at an ultrasonic frequency of 60KHz and a temperature of 65-70°C;

[0037] (3) After the reaction, the obtained activated bentonite slurry was centrifuged and washed to neutrality, then placed in a constant temperature drying oven at 80° C. for 24 hours, and then pulverized to 500-800 nm with a nano pulverizer to obtain activated bentonite;

[0038] (4) Take 2g of activated bentonite, add distilled wa...

Embodiment 3

[0041] The swelling degree of the pH-responsive bentonite prepared in Test Example 2, the specific process is as follows: (hereinafter referred to as the pH-responsive bentonite is AJ-1)

[0042] Accurately weigh 3g of AJ-I and put it in a beaker, add 1000mL of distilled water or 4.5% NaCl aqueous solution, take out AJ-I at intervals, absorb the surface moisture with filter paper, weigh the mass of AJ-I after swelling, and calculate the water content at different times. The swelling ratio SR of the gel is used to draw the swelling rate curve.

[0043] The calculation formula of swelling ratio is shown in formula [1]

[0044] SR=(m t -m o ) / m o ,[1]

[0045]In formula [1], SR is the swelling ratio of AJ-I, %; m o is the mass of AJ-I before water absorption, g; m t is the mass of AJ-I after absorbing water, g.

[0046] figure 1 The swelling properties of AJ-1 and its resistance to saline solution were revealed. By doping the flexible polymer HPAA in the rigid bentonite ...

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Abstract

The invention provides a preparation method of HPAA composite pH-responsive bentonite, comprising: (1) using citric acid as a modifier to perform primary modification on bentonite; (2) mixing the primary modified mixture with a silane coupling agent Ultrasonic compounding is adopted; (3) the compounded mixture is centrifuged, washed and precipitated until it is neutral, dried and crushed to 500-800nm ​​to obtain activated bentonite; (4) activated bentonite is mixed with α-cyanoacrylate, acrylic acid, methacrylic acid Acrylic acid, methyl methacrylate and 2-cyanoacrylic acid were in-situ copolymerized, and after the reaction was completed, they were centrifuged, washed and dried in sequence. The present invention also provides the application of the above-mentioned pH-responsive bentonite in treating unconventional water-sensitive shale. The pH-responsive bentonite of the present invention is equivalent to compounding HPAA molecules with bentonite, which not only ensures the basic plugging strength, but also enhances the flexibility of bentonite particles, which is conducive to embedding irregular nanometer rock pores.

Description

technical field [0001] The invention belongs to the technical field of bentonite preparation, and in particular relates to a preparation method of HPAA composite pH-responsive bentonite. Background technique [0002] As an economical and environmentally friendly industrial raw material, bentonite has been widely used in oil and gas exploration and development. Bentonite is mainly composed of rigid montmorillonite minerals, which are easily combined with water molecules between layers, and have the functions of lifting and locking water, and are mainly used in the exploitation of shallow conventional oil and gas. However, in recent years, with the increasing energy consumption, conventional oil and gas have basically been developed, and oil and gas production has gradually shifted to unconventional oil and gas reservoirs. [0003] Compared with conventional oil and gas reservoirs, unconventional reservoirs have complex structures, are prone to hydration and collapse, and are...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/06C08F222/38C08K9/04C08K9/06C08K3/34C09K8/03
CPCC08F220/06C08K3/346C08K9/04C08K9/06C09K8/03C09K8/032C08F222/385
Inventor 董汶鑫蒲晓林任研君尹启新尹明宇高峰翟玉芬冯雪飞
Owner SOUTHWEST PETROLEUM UNIV