High-temperature-resistant modified nano silicon dioxide blocking agent and oil-based drilling fluid

A nano-silica and oil-based drilling fluid technology, which is applied in the field of oil and gas field drilling, can solve problems such as well wall instability, and achieve the effects of not easy to agglomerate, stable performance, and excellent plugging rate performance

Active Publication Date: 2021-09-07
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problem of well wall instability caused by the inability of conventional plugging agents to effectively plug nano-pores in shale, the present invention provides a high-temperature-resistant modified nano-silica plugging agent with a particle size of nanometer level, which can effectively seal nano-scale fractures in shale formations, so as to achieve the purpose of stabilizing the borehole wall

Method used

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  • High-temperature-resistant modified nano silicon dioxide blocking agent and oil-based drilling fluid
  • High-temperature-resistant modified nano silicon dioxide blocking agent and oil-based drilling fluid
  • High-temperature-resistant modified nano silicon dioxide blocking agent and oil-based drilling fluid

Examples

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Effect test

Embodiment 1

[0025] (1) Modification of silica

[0026] Add 0.25mol nano-silica to 70mL toluene solution, heat up to 50-60°C, stir until dissolved and pass nitrogen gas for 30min, heat up to 90°C and add a certain amount of 3-aminopropyltriethoxysilane ( KH550), react silica and 3-aminopropyltriethoxysilane (KH550) for 5h. Distilled under reduced pressure for 2 hours to obtain a crude product, washed with toluene, filtered to remove unreacted monomers, and dried in vacuum for 2 hours to obtain a modified product of nano-silica.

[0027] (2) Synthesis of secondary amine polymers

[0028] Dissolve the modified product of nano-silica prepared in the previous step with 90-110mL tetrahydrofuran, add 0.24mol 1,5-hexadiene, stir and react at 60°C for 24h, and distill under reduced pressure to obtain the crude product. Vacuum-dry for 2 hours, take a certain amount of dried crude product and add it to 110mL tetrahydrofuran, stir quickly until dissolved, pass nitrogen gas for 30 minutes, keep stir...

Embodiment 2

[0032] (1) Modification of silica

[0033] Add 0.25mol nano-silica to 70mL toluene solution, heat up to 50-60°C, stir until dissolved and pass nitrogen gas for 30min, heat up to 90°C and add a certain amount of 3-aminopropyltriethoxysilane ( KH540), react silica and 3-aminopropyltriethoxysilane (KH540) for 5h. Distilled under reduced pressure for 2 hours to obtain a crude product, washed with toluene, filtered to remove unreacted monomers, and dried in vacuum for 2 hours to obtain a modified product of nano-silica.

[0034] (2) Synthesis of secondary amine polymers

[0035] Dissolve the modified product of nano-silica prepared in the previous step with 110 mL of tetrahydrofuran, add 0.24 mol of diallylamine, stir and react at 60 ° C for 24 h, distill under reduced pressure to obtain the crude product, and dry it in vacuum for 2 h. Take a certain amount of dried crude product and add it to 110mL tetrahydrofuran, stir rapidly until it dissolves, pass nitrogen gas for 30min, ke...

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Abstract

The invention discloses a high-temperature-resistant modified nano silicon dioxide blocking agent and an oil-based drilling fluid, and belongs to the technical field of oil and gas field drilling. The high-temperature-resistant modified nano silicon dioxide blocking agent is synthesized by modifying silicon dioxide with an enamine compound, a diallyl compound, an olefinic bond-containing long-chain alkyl ester compound, an amino-containing silane coupling agent and a cross-linking agent divinyl benzene through a step-by-step synthesis method. The particle size of the blocking agent prepared from the high-temperature-resistant modified nano silicon dioxide is 78-300 nm, the blocking performance is remarkably improved compared with that of similar blocking agents, and the blocking agent is resistant to high temperature and can be applied to deep wells and ultra-deep wells. The blocking agent also has the advantages of easily available raw materials, low price and the like, and the provided synthesis method is stable, reliable, simple, rapid and suitable for industrial production.

Description

technical field [0001] The invention relates to the technical field of oil and gas field drilling, in particular to a high-temperature-resistant modified nano-silica plugging agent and an oil-based drilling fluid. Background technique [0002] During the development of oil and natural gas resources, the exploitation of deep shale gas has always been a research hotspot for researchers. For some hard, brittle and fractured formations with bedding and nanopores and fractures, the invasion of oil-based drilling fluid filtrate will bring formation instability. In addition, the transmission of hydraulic pressure through nanopores and fractures will also lead to wellbore instability. Therefore, it is necessary to strengthen the sealing performance of oil-based drilling fluids on nanopores and fractures. At present, there are few types of plugging agents for oil-based drilling fluids, and most of the plugging materials used are bridge plug-type LWD materials with only hydrophilic p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/467C09K8/42C09K8/36C08F285/00C08F292/00C08F212/36C08F220/18C08F226/04C08F226/02C08F236/20
CPCC09K8/467C09K8/426C09K8/36C08F285/00C08F292/00C08F212/36C08F220/1812C08F226/04C08F226/02C08F236/20
Inventor 谢刚陈宇邓明毅范莉罗玉婧雷震谷硕曹少帅黄国豪汪若兰莫俊秀范翠玲罗清欣
Owner SOUTHWEST PETROLEUM UNIV
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