Preparation method and application of nano microcrystalline blocking agent for drilling fluid

A nano crystallite and plugging agent technology, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of narrow particle size range and high cost of plugging agents, and achieve stable wellbore walls, low cost, The effect of good dispersion performance

Pending Publication Date: 2020-06-12
中石化石油工程技术服务有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] At present, the nano plugging materials used in drilling fluids have problems such as high cost and narrow particle size range of plugging agents.

Method used

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  • Preparation method and application of nano microcrystalline blocking agent for drilling fluid
  • Preparation method and application of nano microcrystalline blocking agent for drilling fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A nano-microcrystalline plugging agent for drilling fluid and a preparation method thereof, the steps are as follows:

[0030] A. Disperse 5g of nanocellulose in 100g of deionized water, and disperse by ultrasonic waves, the frequency of which is 20-50KHz;

[0031] Add 0.2g aluminum chloride and 0.6g tannic acid successively to the above solution, and at room temperature, stir the reaction at a speed of 1000r / min for 1.5 hours, then adjust the suspension after the above reaction with 0.1mol / L NaOH solution to a pH of 9;

[0032] Then wash the suspension with ethanol and deionized water respectively, and then centrifuge and layer. After removing the supernatant, the suspension in the lower part continues to be washed with ethanol and deionized water for many times and centrifugally layered. Generally, the washing is repeated 3-5 times. The volume ratio of ethanol and deionized water is 6:4, and a mixed solution can also be prepared according to this ratio for repeated w...

Embodiment 2

[0036] A nano-microcrystalline plugging agent for drilling fluid and a preparation method thereof, the steps are as follows:

[0037] A. Disperse 5g of nanocellulose in 100g of deionized water, and disperse by ultrasonic waves, the frequency of which is 20-50KHz;

[0038] Add 0.1g aluminum chloride and 0.4g tannic acid successively to the above solution, at room temperature, stir and react at a speed of 500r / min for 2 hours, then adjust the suspension after the above reaction with 0.1mol / L NaOH solution to a pH of 9;

[0039] Then wash the suspension with ethanol and deionized water respectively, and then centrifuge and layer. After removing the supernatant, the suspension in the lower part continues to be washed with ethanol and deionized water for many times and centrifugally layered. Generally, the washing is repeated 3-5 times. The volume ratio of ethanol and deionized water is 6:4, and a mixed solution can also be prepared according to this ratio for repeated washing.

...

Embodiment 3

[0043] A nano-microcrystalline plugging agent for drilling fluid and a preparation method thereof, the steps are as follows:

[0044] A. Disperse 5g of nanocellulose in 100g of deionized water, and disperse by ultrasonic waves, the frequency of which is 20-50KHz;

[0045] Add 0.3g aluminum chloride and 0.8g tannic acid successively to the above solution, and at room temperature, stir the reaction at a speed of 1500r / min for 1 hour, then adjust the suspension after the above reaction with 0.1mol / L NaOH solution to a pH of 9;

[0046] Then wash the suspension with ethanol and deionized water respectively, and then centrifuge and layer. After removing the supernatant, the suspension in the lower part continues to be washed with ethanol and deionized water for many times and centrifugally layered. Generally, the washing is repeated 3-5 times. The volume ratio of ethanol and deionized water is 6:4, and a mixed solution can also be prepared according to this ratio for repeated wash...

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Abstract

The invention discloses a preparation method of a nano microcrystalline blocking agent for drilling fluid. The preparation method comprises the following steps: dispersing nano cellulose in deionizedwater, and carrying out ultrasonic dispersion to obtain a solution; then sequentially adding aluminum chloride and tannic acid for reaction; then adjusting the pH value of the reacted solution to be 9by using alkali liquor; then washing with ethanol and deionized water, and centrifugally layering; removing the suspension liquid at the lower part of the supernatant liquid, repeatedly washing and centrifugally layering, freeze-drying the obtained suspension liquid at the lower part to obtain the nano microcrystalline blocking agent of which the surface is modified with the aluminum-tannic acidfilm layer, performing vacuum drying, and then performing size stabilization and sieving to obtain the nanocrystalline blocking agent. According to the preparation method and application of the nano microcrystalline blocking agent for the drilling fluid, and the nano microcrystalline blocking agent is obtained by modifying nanocellulose and can be uniformly dispersed in the drilling fluid and effectively blocks micro-nano cracks of a shale stratum and provides technical support for keeping the stability of the well wall.

Description

technical field [0001] The invention relates to a preparation method of a nano-microcrystalline plugging agent for drilling fluid, and belongs to the technical field of oilfield chemical drilling fluid treatment agents. Background technique [0002] The particle size of conventional drilling fluid treatment agents is between 0.1 and 1 mm, and it is mainly suitable for plugging formation pore throats and fractures of 0.1 to 1 mm. This shows that conventional treatment agents in drilling fluids are difficult to form mud cakes in shale formations. Professor Chenevert added unmodified nano-SiO2 to water-based drilling fluid in 2009, and found that the drilling fluid with nano-SiO2 reduced the permeability of shale formation and delayed the transmission of pore pressure, so they believed that nano-sealing agent can seal To plug shale pores and throats, a lot of work on nano-blocking agents has been carried out subsequently. At present, nano-calcium carbonate, nano-silica, nano-e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/514C09K8/90
CPCC09K8/514C09K8/905C09K2208/10
Inventor 杨玉精梁明月顾洪成梁明亮王磊王俊寒刘松陈刚王飞孙健赵湛刘丽吴国富王桥蔡成斌刘东章罗泽民杨双欣何丽娟
Owner 中石化石油工程技术服务有限公司
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