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Preparation method and application of modified lignin-based gel water plugging agent

A lignin-based, water blocking agent technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of poor gelling strength, long gelling time, and high crosslinking difficulty, and achieve good temperature resistance , short gelation time and wide applicability

Pending Publication Date: 2022-07-08
湖南骏泰新材料科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the lignin extracted from the conventional papermaking industry also has many deficiencies. When it is directly applied, there are problems such as poor gel strength, high cross-linking difficulty, and long gel forming time, which limits its field application.

Method used

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  • Preparation method and application of modified lignin-based gel water plugging agent
  • Preparation method and application of modified lignin-based gel water plugging agent
  • Preparation method and application of modified lignin-based gel water plugging agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Lignin modification, weigh 200g of alkali lignin, 20g of sodium hydroxide, and 580ml of water, put them into a 1L reaction vessel, stir to dissolve the lignin, add 80g of sodium chloroacetic acid, and keep the temperature at 60°C for 2 hours; then pass The epichlorohydrin was added dropwise. The amount of epichlorohydrin added was 60 g, the dropping time was 1 h, and the temperature was kept at 60 °C for 2 hours. After the reaction, the polyvinyl alcohol dissolved in hot water was added. , 200g with a concentration of 10%, stir evenly, cool down, and finally transfer the mixture to a plastic bucket.

[0032] Lignin is cross-linked and solidified. Weigh 100 g of the above modified wood mixed solution, add 5.0 g of phthalic anhydride and 1.0 g of borax, and then dilute to 250 g with water, and stir evenly with a mixer. Environment, using pressure-resistant tube and hydrothermal reactor as reaction vessel, weighed 100mL and transferred to 100mL pressure-resistant tube and ...

Embodiment 2

[0035] Lignin modification, weigh 200g of alkali lignin, 20g of sodium hydroxide, and 580ml of water, put them into a 1L reaction vessel, stir to dissolve the lignin, add 120g of sodium chloroacetate, and keep the temperature at 55°C for 2 hours; then pass Add epichlorohydrin by dropwise addition, the amount of epichlorohydrin added is 90g, the dropwise addition time is 1h, and then the temperature is kept at 60°C for 3 hours. After the reaction is completed, polyvinyl alcohol dissolved in hot water is added. , the concentration of 100g is 10%, and the mixture is cooled down after stirring evenly, and finally the mixture is transferred to a plastic bucket.

[0036] Lignin is cross-linked and solidified. Weigh 100 g of the modified lignin mixed solution, add 0.5 g of aminophenylboronic acid and 5.0 g of dicyandiamide, dilute to 250 g with water, and stir evenly with a mixer. In order to simulate the formation curing environment, a pressure-resistant tube and a hydrothermal reac...

Embodiment 3

[0039] Lignin modification, pulping and cooking concentrated black liquor 600g (concentration 35%) through membrane filtration, sodium hydroxide 15g, put into 1L reaction vessel, add sodium chloroacetic acid 12g, keep the temperature at 70 ℃ and react for 1.5 hours; then Add epichlorohydrin by dropwise addition, the amount of epichlorohydrin added is 65g, the dropwise addition time is 1h, and then the temperature is kept at 70°C for 2 hours, and after the reaction is completed, 40g of 100-mesh powdery polyvinyl alcohol is added , stir evenly and cool down after the polyvinyl alcohol is completely dissolved, and finally transfer the mixture to a plastic bucket.

[0040] Lignin is cross-linked and cured. Weigh 90 g of the above modified wood mixed solution, add 1.0 g of borax and 5.0 g of dicyandiamide, dilute to 250 g with water, and stir evenly with a mixer. In the curing experiment, in order to simulate the formation curing environment, A pressure-resistant tube and a hydroth...

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Abstract

The invention discloses a preparation method and application of a modified lignin-based gel water shutoff agent, and the preparation method comprises the following preparation steps: step A, putting a lignin raw material into a reaction container, uniformly stirring, adding a carboxymethylation modification reagent, and reacting for a period of time at a certain temperature; step B, adding an epoxy modification reagent, and reacting for a period of time at a certain temperature; c, adding a polyvinyl alcohol solution, uniformly stirring, and cooling; and D, adding a cross-linking agent to adjust the concentration, uniformly stirring, transferring into a high-temperature-resistant pipe or a high-temperature-resistant tank, putting into an electrothermal blowing dry box, and reacting at 100-200 DEG C to form gel, thereby obtaining the modified lignin-based gel water plugging agent. The lignin is subjected to chemical modification, the modified lignin contains carboxyl and epoxy groups at the same time and then acts with the cross-linking agent and the like, the lignin is cured into gel at high temperature, the temperature-resistant and salt-resistant water shutoff agent is formed, the modified lignin is easy to cross-link, the strength after cross-linking and curing is high, and a cured product is good in temperature resistance.

Description

technical field [0001] The invention relates to the technical field of modified lignin-based gel water blocking agent, in particular to a preparation method and application of a modified lignin-based gel water blocking agent. Background technique [0002] Loss of circulation in the process of oilfield drilling and production has become a common phenomenon. By injecting water-blocking agent materials into the formation and solidifying in the formation, high-permeability channels near oil wells can be blocked, the water absorption profile of water wells can be adjusted, and the oil recovery rate can be improved. At present, various types of plugging agents such as gels, foams and granules have been applied in major oilfields at home and abroad. However, as the oil production environment becomes more and more complex, for example, the reservoir temperature in Xinjiang Tahe Oilfield is mostly 120℃~140℃. Salinity higher than 200,000 salinity (20x10 4 mg / L), the existing polymer ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/24C08L97/00C08L29/04C08K5/09C08K3/38C08K5/55C08K5/315C08H7/00C09K8/44
CPCC08J3/246C08H6/00C09K8/44C08J2397/00C08J2429/04C08K5/09C08K2003/387C08K5/55C08K5/3155
Inventor 原兆兵赵凌泉周鲲鹏徐应盛许仲凯王杨弘温洋兵谢武飞樊春华李圣才
Owner 湖南骏泰新材料科技有限责任公司
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