Inorganic modified starch fluid loss reducer for drilling fluid and preparation method thereof

A filtrate reducer and inorganic modification technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of environmental protection performance advantage decline, biodegradability, drilling fluid viscosity increase, etc., to meet production requirements Environmental protection requirements, improved thermal stability, and easy-to-operate effects

Active Publication Date: 2022-04-29
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 fluid loss reducer for drilling fluid and preparation method thereof

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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 fluid loss control agent for drilling fluid and a preparation method thereof. The fluid loss control agent uses starch as a base to modify the starch through esterification of sodium trimetaphosphate, and to modify the ether bonds in the starch. Protect and improve the thermal stability of the molecular structure of starch, and the temperature resistance of the product can reach 140°C; and then through the introduction of phosphoric acid groups in the esterification process, the water-soluble dispersibility of the molecular chain is improved, but the molecular chain does not grow significantly in essence, making it The drilling fluid still maintains a low viscosity effect; in addition, the modified product is pregelatinized, which overcomes the defect that conventional phosphate starch has no fluid loss reduction effect at room temperature; the drilling fluid uses inorganic modified starch to reduce fluid loss The agent has temperature resistance performance, fluid loss reduction performance and viscosity reduction performance, and also has good biodegradability, which meets the production environmental protection requirements. The corresponding preparation method has simple steps, low cost, and is 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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Patent Type & Authority Patents(China)
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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