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Temperature-sensitive-type intelligent nano particles used in drilling fluid and preparation method thereof

A temperature-sensitive, nano-particle technology, applied in the field of oil drilling, can solve problems such as restricting the process of shale gas exploration and development, achieve good monodispersity, avoid foaming problems, and enhance stability.

Inactive Publication Date: 2015-11-11
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the development of micro-cracks and strong water sensitivity in shale formations, serious wellbore stability problems are prone to occur in long horizontal section drilling, which seriously restricts the exploration and development of shale gas

Method used

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  • Temperature-sensitive-type intelligent nano particles used in drilling fluid and preparation method thereof
  • Temperature-sensitive-type intelligent nano particles used in drilling fluid and preparation method thereof
  • Temperature-sensitive-type intelligent nano particles used in drilling fluid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] (1) Nano SiO 2 Surface modification of powder

[0042] nano-SiO 2 The powder was dried in a vacuum oven at 120°C for 24 hours, and 20g of SiO 2 Disperse in 50mL of absolute ethanol, ultrasonically disperse at 600W power for 1h, take another 0.96g of silane coupling agent KH570 and dissolve in absolute ethanol, mix the two, continue ultrasonic treatment for 1-2h, then transfer to a four-necked flask, N 2 Under the conditions of atmosphere, uniform stirring and ultrasonic vibration at 85°C, react for 2-4h. After the reaction, the product is centrifuged, washed with absolute ethanol several times, and dried in a vacuum oven at 60°C for later use.

[0043] (2) Preparation of temperature-sensitive smart nanoparticles

[0044] Add 200mL of distilled water into the reaction kettle equipped with a stirrer, thermometer and heating device, add acetone 100mL, surface modified nano-SiO 2 20g, 12.3g of N-isopropylacrylamide, 9.6g of acrylic acid, stirred at 1500r / min high speed ...

Embodiment 2

[0046] (1) Nano SiO 2 Surface modification of powder

[0047] nano-SiO 2 Dry the powder in a vacuum oven at 120°C for 24 hours, weigh 15g of SiO 2 Disperse in 50mL of absolute ethanol, ultrasonically disperse at 900W power for 1h, take another 1.32g of silane coupling agent KH550 and dissolve in absolute ethanol, mix the two, continue ultrasonic treatment for 2-3h, then transfer to a four-necked flask, N 2 Under the conditions of atmosphere, uniform stirring and ultrasonic vibration at 85°C, react for 2-4h. After the reaction, the product is centrifuged, washed with absolute ethanol several times, and dried in a vacuum oven at 60°C for later use.

[0048] (2) Preparation of temperature-sensitive smart nanoparticles

[0049] Add 300mL of distilled water to the reaction kettle equipped with stirrer, thermometer and heating device, add acetone 150mL, surface modified nano-SiO 2 25g, N,N-dimethylacrylamide 16.7g, methacrylic acid 11.2g, 1000r / min high-speed stirring to form a ...

Embodiment 3

[0051] (1) Nano SiO 2 Surface modification of powder

[0052] nano-SiO 2 The powder was dried in a vacuum oven at 120°C for 24 hours, and 25g of SiO 2 Disperse in 80mL of absolute ethanol, ultrasonically disperse at 1000W for 1.2h, take another 2.1g of silane coupling agent A-151 and dissolve in absolute ethanol, mix the two, continue ultrasonic treatment for 2-3.5h, then transfer to four flask, N 2 Under the conditions of atmosphere, uniform stirring and ultrasonic oscillation at 75°C, react for 3-4h. After the reaction, the product is centrifuged, washed with absolute ethanol several times, and dried in a vacuum oven at 60°C for later use.

[0053] (2) Preparation of temperature-sensitive smart nanoparticles

[0054] Add 250mL of distilled water to a reaction kettle equipped with a stirrer, a thermometer and a heating device, and add 130mL of isopropanol, surface-modified nano-SiO 2 26.1g, N-isopropylacrylamide 12.3g, methyl acrylate, styrene 9.6g, 2000r / min high-speed ...

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Abstract

The invention relates to a temperature-sensitive-type intelligent nano particles used in a drilling fluid and a preparation method thereof. In the invention, a silane coupling agent is used for performing ultrasound surface modification to nano SiO2 and a vinyl functional group is introduced. With the surface-modified nano SiO2, a temperature-sensitive-type monomer and a hydrophilic monomer are subjected to a polymerization reaction in a water medium with a co-solvent with addition of an initiator, wherein granularity distribution of the temperature-sensitive-type intelligent nano particles is D10 <= 100 nm, D 50 <= 165 nm and D90 <= 260 nm. When the temperature is higher than a sensitive value, the nano particles achieve double functions of both physical blocking and chemical inhibition, so that a continuous compact hydrophobic blocking layer is formed inside shale, thereby achieving effects of preventing and delaying pressure transmission and filtration invasion, and further enhancing stability of a shale well wall.

Description

Technical field: [0001] The invention relates to a temperature-sensitive intelligent nano particle for drilling fluid in the process of petroleum drilling and a preparation method thereof, which is used in drilling fluid construction and belongs to the field of petroleum drilling. technical background: [0002] Before the 1990s, domestic and foreign attention to unconventional natural gas resources focused on coalbed methane and tight sandstone gas. In recent years, driven by technological advances such as horizontal well drilling, coiled tubing perforation and hydraulic fracturing, countries such as the United States and Canada have taken the lead in commercially developing shale gas and achieved great success. It is estimated that the global final shale gas resources are more than 1000×10 12 m 3 . The growth rate of shale gas production in North America is astonishing. In 2011, shale gas production in the United States already accounted for 15% of its natural gas produc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/03C09K8/50
CPCC09K8/03C09K8/50C09K2208/10C09K2208/18
Inventor 邱正松王伟吉黄维安钟汉毅董兵强暴丹
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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