Application of carbon microspheres serving as blocking agent for high-temperature water-based drilling fluid and high-temperature water-based drilling fluid

A technology of water-based drilling fluid and carbon microspheres, which is applied in the direction of drilling compositions, nano-carbon, chemical instruments and methods, etc., and can solve the problems of poor high temperature resistance and other problems

Active Publication Date: 2019-08-09
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the problem of poor high temperature resistance of the plugging agent used in drilling fluid in the prior art, and to provide a carbon microsphere as a plugging agent for high temperature water-based drilling fluid and a high-temperature water-based drilling liquid

Method used

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  • Application of carbon microspheres serving as blocking agent for high-temperature water-based drilling fluid and high-temperature water-based drilling fluid
  • Application of carbon microspheres serving as blocking agent for high-temperature water-based drilling fluid and high-temperature water-based drilling fluid
  • Application of carbon microspheres serving as blocking agent for high-temperature water-based drilling fluid and high-temperature water-based drilling fluid

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Embodiment approach

[0017] According to a preferred embodiment of the present invention, the biomass contains cellulose, and the reaction temperature for the hydrothermal reaction is 215-320°C, preferably 230-300°C.

[0018] According to another preferred embodiment of the present invention, the biomass is selected from at least one of glucose, fructose, chitosan, sucrose, β-cyclodextrin and starch, and the reaction temperature for hydrothermal reaction is 160- 240°C.

[0019] According to the present invention, after the completion of the hydrothermal reaction, a dark brown suspension is obtained, which can be centrifuged, washed and dried to obtain carbon microspheres. The methods for centrifuging, washing and drying can be common methods in the art, and the present invention is not limited here.

[0020] The second aspect of the present invention provides a high-temperature water-based drilling fluid, which contains water, bentonite, carbon microspheres, high-temperature shale inhibitors, hig...

preparation example 1

[0032] Weigh 25g of β-cyclodextrin, stir it at high speed and disperse it into 500mL of deionized water, transfer the mixture to a hydrothermal reaction kettle, put it in an oil bath, and react at 160°C for 30h. After it was lowered to room temperature, the dark brown suspension solution generated after the reaction was centrifuged at 15000rpm for 20min, and the precipitate obtained by centrifugation was ultrasonicated with absolute ethanol and deionized water respectively, centrifuged and washed three times, and the dark brown precipitate obtained was placed on Dry in an oven at 60°C to obtain a fluffy black powdery substance, i.e. carbon microspheres, denoted as CMS-1, with an average particle size of 246nm and a total amount of oxygen-containing functional groups of 0.214mmol / g.

preparation example 2

[0034] Disperse 5 g of fiber cotton pulp (cellulose) in 100 mL of deionized water, stir at a rate of 500 rpm at room temperature for 2 h to obtain a milky white paste system, and then use a cell pulverizer to sonicate for 10 min and transfer it to a hydrothermal reaction kettle with a volume of 250 mL. In a high-temperature roller heating furnace, control the temperature in the furnace to 300°C for 8 hours, then cool naturally to room temperature, and centrifuge the dark brown suspension solution at 15,000 rpm for 20 minutes. Water ultrasonication, centrifugation, and washing three times, the obtained dark brown precipitate was placed in an oven and dried at 50°C to obtain a fluffy black powdery substance, that is, carbon microspheres, which were recorded as CMS-2, and the average particle size was measured It is 409nm, and the total amount of oxygen-containing functional groups is 0.254mmol / g.

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Abstract

The invention relates to the field of oilfield chemistry, and discloses application of carbon microspheres serving as a blocking agent for high-temperature water-based drilling fluid and the high-temperature water-based drilling fluid. The average particle size of the carbon microspheres is 50-50,000 nanometers, the total number of oxygen-containing functional groups is greater than or equal to 0.2 mmol / g, and the carbon microspheres serving as the blocking agent for the high-temperature water-based drilling fluid are good in blocking performance at the high temperature of 200 DEG C and friendly to the environment.

Description

technical field [0001] The invention relates to the field of oilfield chemistry, in particular to the application of carbon microspheres as a plugging agent for high-temperature water-based drilling fluid and the high-temperature water-based drilling fluid. Background technique [0002] The problem of shale borehole wall in oil and gas drilling engineering has always been a worldwide technical problem. When drilling hard and brittle mud shale, the surface of hard mud shale is dense, and the pore throat radius is mostly distributed in the nanometer scale. Free water in drilling fluid can easily enter the micro-nano pores of mud shale under the action of positive pressure difference. In the process, hydration stress is generated after contact with formation clay, which leads to a decrease in the effective pressure of the borehole wall, which is manifested as shale spalling and falling off macroscopically. Therefore, the effective plugging of the micro-nano pores of hard and b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/516C09K8/504C09K8/16C01B32/15
CPCC01B32/15C09K8/16C09K8/5045C09K8/516C09K2208/10
Inventor 钟汉毅沈广成邱正松高鑫汤志川李佳周国伟
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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