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Granular temporary plugging agent preparation method

A technology of temporary plugging agent and particles, which is applied in the field of preparation of granular temporary plugging agents, can solve the problems of reduced plugging strength, influence on water plugging effect, and inability to exert plugging effect, and improve high temperature resistance and strength, and be easy to carry The effect of using

Inactive Publication Date: 2017-09-05
雷春生
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention: Aiming at the problem that the traditional temporary plugging agent has reduced plugging performance in high-temperature oil well environment, cannot play a normal plugging effect, and the plugging strength is reduced, which affects the water plugging effect, a particle Preparation method of temporary plugging agent

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0019] Weigh 15g of cornstarch, 30g of polysaccharide, 20g of cellulose and 140g of isopropanol into a three-necked flask, place the three-necked flask in a water bath, and drop 80g of 20% hydrogen into the three-necked flask at 5°C Sodium oxide solution, control the rate of addition to be 4g / min, add dropwise while stirring with a rotating speed of 500r / min, continue to stir and react for 70min after the dropwise addition is completed, after the reaction, the three-necked flask is removed from the water bath and placed at room temperature, and then poured into the three-necked flask Add 80g of 15% chloroacetic acid solution by mass fraction to the flask dropwise, and control the dropping rate to 5g / min. After the dropwise addition, move the three-necked flask into a water bath, stir and react at 80°C and 500r / min for 4h, and cool to room temperature after the reaction. and discharge to obtain the reaction solution, then adjust the pH value of the reaction solution with 10% hyd...

example 2

[0021]Weigh 10g of cornstarch, 20g of polysaccharide, 15g of cellulose and 120g of isopropanol into a three-necked flask, place the three-necked flask in a water bath, and drop 60g of 20% hydrogen into the three-necked flask at 3°C Sodium oxide solution, control the rate of addition to be 2g / min, add dropwise while stirring at a speed of 400r / min, continue to stir and react for 50min after the dropwise addition, after the reaction, the three-necked flask is removed from the water bath and placed at room temperature, and then poured into the three-necked flask Add dropwise 70g of 15% chloroacetic acid solution in mass fraction, and control the dropping rate to 3g / min. After dropping, move the three-necked flask into a water bath, stir and react at 60°C and 400r / min for 2h, and cool to room temperature after reaction. and discharging to obtain the reaction solution, then use 10% hydrochloric acid to adjust the pH value of the reaction solution to 7.0, place the adjusted reaction ...

example 3

[0023] Weigh 12g of cornstarch, 25g of polysaccharide, 17g of cellulose and 130g of isopropanol into a three-necked flask, place the three-necked flask in a water bath, and drop 80g of 20% hydrogen into the three-necked flask at 4°C. Sodium oxide solution, control the rate of addition to be 3g / min, add dropwise while stirring at a speed of 450r / min, continue to stir and react for 60min after the dropwise addition, after the reaction, the three-necked flask is removed from the water bath and placed at room temperature, and then poured into the three-necked flask Add 75g of chloroacetic acid solution with a mass fraction of 15% dropwise into the flask, and control the drop rate to 4g / min. After the dropwise addition, move the three-necked flask into a water bath, stir and react at 70°C and 450r / min for 3h, and cool to room temperature after the reaction and discharging to obtain the reaction solution, then adjust the pH value of the reaction solution with 10% hydrochloric acid by...

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Abstract

The invention relates to a granular temporary plugging agent preparation method, and belongs to the technical field of oilfield exploitation. Corn starch, pachymaran and the like are stirred and mixed, sodium hydroxide solution is added drop by drop at low temperature, reaction is performed, chloroacetic acid solution is added drop by drop, the solution is heated, mixed and filtered, filtrate is dialyzed and then concentrated to obtain concentrated solution, the concentrated solution and absolute ethyl alcohol are mixed and filtered at low temperature, filter residues are dried and then mixed with water and the like to obtain mixed solution A, acrylic acid, ammonia water and the like serving as raw materials are mixed to obtain mixed solution B, the mixed solution B is added into the mixed solution A, surfactants and the like are added to prepare viscous solution, and finally, the viscous solution is cooled, placed, dried and crushed. Temporary plugging agents prepared by the preparation method are good in heat resistance, have good plugging effects under the condition of high temperature and have a wide application prospect, and the strength of plugging layers is greatly improved.

Description

technical field [0001] The invention relates to a preparation method of a particle temporary plugging agent, which belongs to the technical field of oilfield exploitation. Background technique [0002] As a large number of mature oil fields gradually enter the dry production period, only 25-35% of underground crude oil can be obtained even after water flooding development, and there are still a large number of undeveloped reservoirs or oil layers with a low degree of production in the oil layers. Water injection production not only has low recovery efficiency, but also with the long-term continuous development of water injection oil fields, after entering the middle and late stages of development, the comprehensive water content of the oil field has increased, and operations such as workover, well killing, and sand washing have been frequent, and workover fluids have leaked into the formation Pollution, as well as serious problems such as the year-by-year deterioration of oi...

Claims

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Application Information

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IPC IPC(8): C08F251/00C08F251/02C08F220/06C08F220/56C08F222/38C08F8/00C08B31/12C08B37/00C08B11/12C09K8/514C09K8/512
CPCC08F251/00C08B11/12C08B31/12C08B37/00C08F8/00C08F251/02C09K8/5083C09K8/512C09K8/514C08F220/06
Inventor 刘丹薛焱璟陈春
Owner 雷春生
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