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Strong-adsorption salt-resistant blocking agent based on nano silicon dioxide and water-based drilling fluid

A technology of nano-silica and water-based drilling fluid, which is applied in the field of water-based drilling fluid, can solve problems such as well wall instability, and achieve the effects of enhanced plugging performance, enhanced adsorption performance, and good performance

Active Publication Date: 2022-04-15
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-pores and fractures in shale, the present invention provides a nanometer-based Silica strong adsorption and anti-salt plugging agent, its particle size is nano-scale, can effectively seal nano-scale pores and fractures in shale formations, so as to achieve the purpose of stabilizing the well wall

Method used

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  • Strong-adsorption salt-resistant blocking agent based on nano silicon dioxide and water-based drilling fluid
  • Strong-adsorption salt-resistant blocking agent based on nano silicon dioxide and water-based drilling fluid
  • Strong-adsorption salt-resistant blocking agent based on nano silicon dioxide and water-based drilling fluid

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Effect test

Embodiment 1

[0024] S1. Weigh 1 mole of nano-silica in 120 mL of absolute ethanol, disperse it ultrasonically for 30 minutes, add hydrochloric acid solution to adjust the pH value to 5, and then add 2.5 moles of γ-aminopropyltriethoxysilane to obtain a mixed solution. Stir the mixture at 60°C for 3.5 hours, put it into a centrifuge after the reaction, centrifuge at 5000rpm for 5min, then filter, and then wash the solid matter with deionized water and absolute ethanol for 3 times, and finally, the solid Vacuum drying in an oven at 60°C for 24 hours to obtain modified nano-silica;

[0025] S2. Introduce 120ml of methyl acetate into a 250mL round-bottomed three-necked bottle, add 1 mole of modified nano-silica, and ultrasonically disperse for 30 minutes, then add 2.5 moles of D-alanine methyl ester hydrochloride, and then Add 1 mole of O-(7-azabenzotriazol-1-yl)-N,N,N',N'-tetramethyluronium tetrafluoroborate quaternary ammonium salt, cool and reflux at 60°C for 6 hours , followed by washing ...

Embodiment 2

[0029] S1. Weigh 0.5 mole of nano-silica in 100mL of absolute ethanol, disperse it ultrasonically for 30 minutes, add hydrochloric acid solution to adjust the pH value to 5, and then add 1.5 mole of N-β-(aminoethyl)-γ-aminopropyl Trimethoxysilane was used to obtain a mixed solution, and the mixed solution was stirred at 60°C for 3.5 hours. After the reaction, it was placed in a centrifuge, centrifuged at a speed of 5000 rpm for 5 minutes, then filtered, and then washed with deionized water and absolute ethanol The solid material was processed 3 times, and finally, the solid was vacuum-dried in an oven at 60°C for 24 hours to obtain modified nano-silica;

[0030]S2. Introduce 120ml of methyl acetate into a 250mL round-bottomed three-necked bottle, add 0.5 mole of modified nano-silica, and ultrasonically disperse for 30min, then add 1.5 mole of D-alanine methyl ester hydrochloride respectively, and then Add 0.5 mole of O-(7-azabenzotriazol-1-yl)-N,N,N',N'-tetramethyluronium tetr...

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Abstract

The invention discloses a strong-adsorption salt-resistant plugging agent based on nano silicon dioxide and a water-based drilling fluid, and belongs to the technical field of oil and gas field drilling. The strong-adsorption salt-resistant blocking agent based on nano-silica is prepared from nano-silica, an amino-containing silane coupling agent, D-alanine methyl ester hydrochloride, a double-bond-containing chloro compound and an amine compound containing a sulfonic acid functional group through a step-by-step method, and contains a quaternary ammonium functional group and a sulfonic acid functional group, the adsorption performance and the temperature-resistant and salt-resistant performance are relatively high. The synthetic raw materials of the blocking agent are easy to obtain, and the synthetic method is simple and reliable. The particle size distribution of the synthesized strong-adsorption salt-resistant plugging agent based on nano-silica is 146-843 nm, and nano-scale apertures in a shale well wall can be effectively plugged. The plugging agent can be directly added into the water-based drilling fluid, is good in compatibility, can effectively prevent the drilling fluid from permeating into a stratum so as to stabilize a well wall and prevent collapse, and has good plugging and filtrate reduction effects.

Description

technical field [0001] The invention relates to the technical field of drilling in oil and gas fields, in particular to a strong-adsorption salt-resistant plugging agent based on nano-silica and a water-based drilling fluid containing the plugging agent. Background technique [0002] The exploitation of shale gas has always been the focus of research in the oil and gas industry. During drilling operations, the plugging performance of drilling fluid is very important in the face of hard, brittle and fractured formations with micro-fractures. Driven by the positive pressure difference, the drilling fluid easily invades these micro-fractures and produces hydraulic wedge action, which makes the fractures expand and become larger and connected. Conventional plugging agents can achieve a good plugging effect on micron-scale pores and fractures, but for nano-scale pores and fractures, there is no corresponding plugging material for effective plugging, resulting in wellbore instabi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/03C09K8/16C09K8/24C09K8/46C09K8/467
CPCY02P20/141
Inventor 谢刚雷震邓明毅白杨范莉罗玉婧陈宇王平全
Owner SOUTHWEST PETROLEUM UNIV
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