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Inorganic modified starch filtrate reducer for drilling fluid and preparation method of inorganic modified starch filtrate reducer

A technology of inorganic modification and fluid loss reducing agent, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of declining environmental performance advantages, increasing drilling fluid viscosity, reducing biodegradability, etc., to meet production requirements. Environmental requirements, easy operation, and the effect of improving thermal stability

Active Publication Date: 2020-12-01
CNPC BOHAI DRILLING ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Starch has been widely used as a fluid loss control agent for drilling fluids. Among them, pregelatinized starch, carboxymethyl starch and grafted modified starch are widely used in fluid loss control agents for drilling fluids; however, among the above-mentioned commonly used starch Among them, the temperature resistance of pregelatinized starch is only 100°C, and because it is only physically modified, it is very easy to ferment during field use, resulting in an increase in the viscosity of drilling fluid and an increase in filtration loss; the temperature resistance of carboxymethyl starch is only It is 120°C, and its temperature resistance limit makes it also have the problem of limited use scale, and the general carboxymethyl starch also has a high viscosity effect; while polymer grafted modified starch can effectively improve its temperature resistance ability, but grafting comonomers will reduce its biodegradability, resulting in a decline in environmental performance advantages, and the viscosity effect will be improved after polymer modification

Method used

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  • Inorganic modified starch filtrate reducer for drilling fluid and preparation method of inorganic modified starch filtrate reducer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A preparation method of inorganic modified starch fluid loss reducer for drilling fluid, the steps are as follows:

[0025] S1. Dispersing 100 parts by weight of cornstarch into 200 parts by weight of deionized water to obtain a starch suspension, adding sodium hydroxide to adjust the pH of the starch suspension to 7;

[0026] S2. Warm up the starch suspension to 40°C, add 1.5 parts by weight of sodium trimetaphosphate, and react at 40°C for 4 hours while stirring;

[0027] S3. Continue to add 3 parts by weight of acetic anhydride to the reaction solution obtained in step S2, and continue to react at 40° C. for 4 hours while stirring; and add sodium hydroxide after the reaction to adjust the pH of the reaction solution to 7;

[0028] S4, rotary evaporation removes the solvent in the reaction product liquid, and the obtained solid product is dried and pulverized;

[0029] S5, add the deionized water that weight is 3% of solid particle weight to the solid particle obtain...

Embodiment 2

[0031] A preparation method of inorganic modified starch fluid loss reducer for drilling fluid, the steps are as follows:

[0032] S1. Dispersing 100 parts by weight of cornstarch into 200 parts by weight of deionized water to obtain a starch suspension, adding sodium hydroxide to adjust the pH of the starch suspension to 7;

[0033] S2. Warming the starch suspension to 40°C, adding 2 parts by weight of sodium trimetaphosphate, and reacting at 40°C for 4 hours while stirring;

[0034] S3. Continue to add 5 parts by weight of acetic anhydride to the reaction solution obtained in step S2, and continue to react at 40° C. for 4 hours under stirring; and add sodium hydroxide after the reaction to adjust the pH of the reaction product to 7;

[0035] S4, rotary evaporation removes the solvent in the reaction product liquid, and the obtained solid product is dried and pulverized;

[0036] S5, add the deionized water that weight is 3% of solid particle weight to the solid particle obt...

Embodiment 3

[0038] A preparation method of inorganic modified starch fluid loss reducer for drilling fluid, the steps are as follows:

[0039] S1. Dispersing 100 parts by weight of cassava flour into 200 parts by weight of deionized water to obtain a starch suspension, adding sodium hydroxide to adjust the pH of the starch suspension to 7;

[0040] S2. Warm up the starch suspension to 40°C, add 1.8 parts by weight of sodium trimetaphosphate, and react at 40°C for 4 hours while stirring;

[0041] S3. Continue to add 4 parts by weight of acetic anhydride to the reaction solution obtained in step S2, and continue to react at 40° C. for 4 hours while stirring; and add sodium hydroxide after the reaction to adjust the pH of the reaction product to 7;

[0042] S4, rotary evaporation removes the solvent in the reaction product liquid, and the obtained solid product is dried and pulverized;

[0043] S5, add the deionized water that weight is 3% of solid particle weight to the solid particle obta...

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Abstract

The invention discloses an inorganic modified starch filtrate reducer for a drilling fluid and a preparation method of the inorganic modified starch filtrate reducer. The inorganic modified starch filtrate reducer takes starch as a matrix; esterification modification is carried out on the starch through sodium trimetaphosphate, so ether bonds in the starch are protected, the thermal stability of amolecular structure of the starch is improved, and the temperature resistance of a product can reach 140 DEG C; then a phosphate group is introduced in the esterification process, so the water-soluble dispersity of a molecular chain is improved, but the molecular chain is not remarkably increased substantially, and thus, the inorganic modified starch filtrate reducer still has a relatively low viscosity effect in a drilling fluid; in addition, the obtained modified product is subjected to pre-gelatinization treatment, so the defect that conventional phosphate starch has no filtrate loss reduction effect at room temperature is overcome; the inorganic modified starch filtrate reducer for the drilling fluid has temperature resistance, filtrate loss reduction performance and viscosity reduction performance, and also has good biodegradability, and meets environmental protection requirements of production; and the corresponding preparation method is simple and feasible in steps, low in costand suitable for large-scale production.

Description

technical field [0001] The invention relates to the technical field of petroleum and natural gas, in particular to an inorganic modified starch fluid loss reducer for drilling fluid and a preparation method thereof. Background technique [0002] Starch has been widely used as a fluid loss control agent for drilling fluids. Among them, pregelatinized starch, carboxymethyl starch and grafted modified starch are widely used in fluid loss control agents for drilling fluids; however, among the above-mentioned commonly used starch Among them, the temperature resistance of pregelatinized starch is only 100°C, and because it is only physically modified, it is very easy to ferment during field use, resulting in an increase in the viscosity of drilling fluid and an increase in filtration loss; the temperature resistance of carboxymethyl starch is only It is 120°C, and its temperature resistance limit makes it also have the problem of limited use scale, and the general carboxymethyl st...

Claims

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Application Information

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IPC IPC(8): C08B31/06C09K8/035
CPCC08B31/066C09K8/035
Inventor 张坤马红王威霍宝玉刘强王惠苏君张鹏张宾
Owner CNPC BOHAI DRILLING ENG
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