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Method for preparing HPAA compounded pH response type bentonite

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

Active Publication Date: 2019-11-01
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 field requirements

Method used

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  • Method for preparing HPAA compounded pH response type bentonite
  • Method for preparing HPAA compounded pH response type bentonite
  • Method for preparing HPAA compounded pH response type bentonite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The present embodiment provides a kind of preparation method of HPAA composite pH-responsive bentonite, the main reaction process, comprising the following steps:

[0028] (1) 3 g of bentonite was prepared into 100 mL of 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 resulting 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 500-800nm ​​with a nano pulverizer to obtain activated bentonite;

[0031] (4) Take 2g of activated bentonite, add distilled water, and st...

Embodiment 2

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

[0035] (1) 3 g of bentonite was prepared into 100 mL of 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 resulting 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 500-800nm ​​with a nano pulverizer to obtain activated bentonite;

[0038] (4) Take 2g of activated bentonite, a...

Embodiment 3

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

[0042] Accurately weigh 3g of AJ-I and place it in a beaker, add 1000mL of distilled water or 4.5% NaCl aqueous solution, take out AJ-I at regular 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 formula for calculating the swelling ratio is shown in formula [1]

[0044] SR=(m t -mo ) / 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 r...

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Abstract

The invention provides a method for preparing HPAA compounded pH response type bentonite. The method comprises the steps: (1) carrying out primary modification on bentonite by taking citric acid as amodifier; (2) subjecting the primary-modified mixture and a silane coupler to ultrasonic compounding; (3) centrifuging the complete-compounded mixture, washing precipitates by water until the precipitates are neutral, drying and crushing the precipitates until the grain size is 500nm to 800nm, so as to obtain activated bentonite; and (4) subjecting the activated bentonite to an in-situ copolymerization reaction with alpha-cyanoacrylate, acrylic acid, methacrylic acid, methyl methacrylate and 2-cyanoacrylic acid, and carrying out centrifugation, washing and drying sequentially after the reaction ends up. The invention further provides an application of the pH response type bentonite in treatment of non-conventional water-sensitive shale. According to the pH response type bentonite providedby the invention, equivalently, HPAA molecules are compounded by bentonite, basic plugging strength is guaranteed, meanwhile, the flexibility of bentonite particles is enhanced, and the imbedding in irregular nano-micron rock pores is facilitated.

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 natural 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, the conventional oil and gas have basically been developed, and oil and gas exploitation 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 col...

Claims

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Application Information

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Patent Type & Authority Applications(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
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