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High-temperature-resistant silicon dioxide grafted tertiary amine nano blocking agent and water-based drilling fluid

A nano plugging agent and water-based drilling fluid technology, applied in the field of oil and gas field drilling, can solve problems such as wellbore instability, and achieve the effects of not easy to agglomerate, stable performance, and easy production

Active Publication Date: 2021-08-24
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 conventional plugging agents unable to effectively plug nano-fractures in mud shale, the present invention provides a high-temperature-resistant silica-grafted tertiary amine nano-sealing agent with a particle size of Nano-scale, can effectively seal nano-scale fractures in shale formations, so as to achieve the purpose of stabilizing the borehole wall
And developed a new nano-blocking water-based drilling fluid that can be applied to shale formations to replace oil-based drilling fluid, which can solve the problems of wellbore stability and reservoir pollution.

Method used

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  • High-temperature-resistant silicon dioxide grafted tertiary amine nano blocking agent and water-based drilling fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Modification of silica

[0028] Add 0.25mol nano-silica to 70mL toluene solution, heat up to 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) while stirring , Reaction of 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.

[0029] (2) Synthesis of secondary amine polymers

[0030] Dissolve the modified product of nano-silica prepared in the previous step with 110 mL of tetrahydrofuran, add 0.24 mol of 1,5-hexadiene, 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 quickly until it dissolves, pass nitrog...

Embodiment 2

[0034] (1) Modification of silica

[0035] Add 0.25mol nano-silica into 70mL of toluene solution, heat up to 60°C, stir until dissolved and blow nitrogen gas for 30min, add a certain amount of 3-aminopropyltriethoxysilane (KH540) while stirring up to 90°C, Silica and 3-aminopropyltriethoxysilane (KH540) were reacted 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.

[0036] (2) Synthesis of secondary amine polymers

[0037] 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 quickly until it dissolves, pass nitrogen gas...

Embodiment 3

[0041] (1) Modification of silica

[0042] Add 0.25mol nano-silica to 70mL toluene solution, heat up to 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) while stirring , Reaction of 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.

[0043] Dissolve the modified product of nano-silica prepared in the previous step with 110 mL of tetrahydrofuran, add 0.24 mol of N-methyldiallylamine, stir and react at 60 ° C for 24 h, 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 stirring and pass nitrogen ga...

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Abstract

The invention relates to a high-temperature-resistant silicon dioxide grafted tertiary amine nano blocking agent and a water-based drilling fluid, which belong to the technical field of oil and gas field drilling. The high-temperature-resistant silicon dioxide grafted tertiary amine nano blocking agent is synthesized from a hydroxyl-containing hydrazine compound, a diallyl compound, an enamine compound and an amino-containing silane coupling agent as raw materials through modification of silicon dioxide in a step-by-step synthesis method. The particle size of the plugging agent prepared from the high-temperature-resistant silicon dioxide grafted tertiary amine is 58-280 nm, the plugging performance of the plugging agent is remarkably improved compared with that of similar plugging agents, besides the plugging performance of the plugging agent, a plurality of external tertiary amine branched chains of the plugging agent further have very high adsorption performance and inhibition performance, and the plugging agent is resistant to high temperature and can be applied to deep wells and ultra-deep wells. The plugging 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 silicon dioxide grafted tertiary amine nano-sealing agent and water-based drilling fluid. Background technique [0002] At present, in domestic and foreign drilling, there are often problems of well wall instability. The statistics of hundreds of wells at home and abroad show that the shale formations drilled account for 70% of the total formations drilled, and more than 90% of the well collapses occurred in the shale formations. rock formations. Shale has a special pore structure, which is ultra-low porosity and low permeability, and mostly nano-scale pore throats. According to the accumulation characteristics of shale gas, horizontal well drilling has become the main drilling method for shale gas development. Regardless of whether water-based drilling fluid system or oil-based drilling fluid system is used to drill shale formati...

Claims

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Application Information

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IPC IPC(8): C09K8/035C09K8/508C09K8/514C09K8/24C09K8/88C09K8/90C09K8/42C08F292/00C08F8/30
CPCC09K8/03C09K8/035C09K8/5086C09K8/5045C09K8/514C09K8/24C09K8/885C09K8/90C09K8/426C09K8/882C08F292/00C08F8/30C09K2208/10B82Y30/00B82Y40/00
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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