Preparation method for amphoteric ion modified starch for well drilling fluid

A zwitterion and drilling fluid technology, which is applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the constraints of polymer salt and calcium resistance, the imbalance between polymer hydration performance and inhibition performance, and the inability to achieve "reverse" Polyelectrolyte effect and other issues

Active Publication Date: 2015-09-23
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the limitation of cationic polymerization activity, the content of anions in the polymer is much more than that of cations, the number of positive and negative charges in the copolymer is not equal, the hydration performance and inhibition performance of the polymer are out of balance, and the best "reverse polyelectrolyte" effect cannot be achieved. Polymerization Anti-salt and anti-calcium performance of the compound is restricted

Method used

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  • Preparation method for amphoteric ion modified starch for well drilling fluid
  • Preparation method for amphoteric ion modified starch for well drilling fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] First prepare N,N-dimethylallyl propane sulfonate.

[0025] Weigh 430g of N,N-dimethylallylamine (DA) into the reactor, then put it into a constant temperature water bath, heat and start stirring. Then weigh 122g of 1,3-propane sultone (PS), add it directly into DA, the reaction temperature is 45°C, stir and react for 3 hours to obtain N,N-dimethylallyl propane sulfonate (DAPS) crude products. Transfer the crude DAPS product to a large piece of filter paper, wrap it in a Soxhlet extractor, and use ethanol as a solvent to extract for 3 hours. After the extraction, put the filter paper bag in a drying box and dry it at 50°C to obtain Pure DAPS monomer with a yield of 94.3%.

Embodiment 2

[0031] Weigh 100g of starch and add deionized water to gelatinize at 60°C for 30min, 2 Add 5g potassium persulfate after processing for 30min, weigh 100g AM respectively, add 170g DAPS into deionized water for dissolving, then transfer to the gelatinized starch reactor, the total mass concentration of monomer is 25%, after reacting for 5h, a colloidal solid is obtained, and the Washing with acetone gave a white precipitate. The white precipitate was dried at 70° C. for 12 h and crushed to obtain the final product.

Embodiment 3

[0033] Weigh 100g of starch and add deionized water to gelatinize at 60°C for 30min, 2Add 3g potassium persulfate after processing for 30min, weigh 80g AM respectively, add 150g DAPS into deionized water to dissolve and then transfer to gelatinized starch reactor, the total mass concentration of monomer is 20%, after reacting for 6h, a colloidal solid is obtained, and Washing with acetone gave a white precipitate. The white precipitate was dried at 70° C. for 12 h and crushed to obtain the final product.

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Abstract

The invention provides a preparation method for amphoteric ion modified starch for a well drilling fluid, wherein the preparation method comprises the steps: weighing N,N-dimethylallylamine and 1,3-propanesultone with the molar ratio of 2:1 to 8:1, carrying out a reaction for 0.5-4 h at the temperature of 10-60 DEG C, filtering, extracting, and drying to obtain N,N-dimethylallyl propanesulfonate; adding water to starch, stirring to obtain gelatinized starch, introducing N2, carrying out a reaction, and then adding an initiator; and dissolving acrylamide and N,N-dimethylallyl propanesulfonate with a solvent, adding into the gelatinized starch after treatment, carrying out a reaction for 4-6 h at the temperature of 60-80 DEG C, to obtain a colloidal solid, cleaning with acetone to obtain a white precipitate, and finally drying and crushing to obtain the amphoteric ion modified starch. The modified starch obtained by the method can resist NaCl saturation and resist high content of CaCl2, has the filtrate loss reduction amount of a polymer decreased along with the increase of the salt content, and besides has the advantages of excellent shale inhibition performance.

Description

technical field [0001] The invention relates to drilling fluid modified starch used in oil drilling process, in particular to a preparation method of zwitterion modified starch used in drilling fluid. Background technique [0002] With the rapid increase in demand for oil and gas resources in the world and the advancement of drilling technology, countries around the world have increased their investment in the exploration and development of oil and gas resources in deep formations. The performance of drilling fluid is directly related to the drilling quality, drilling cost and drilling cycle of deep and ultra-deep wells. As one of the drilling fluid treatment agents with the largest production and sales volume and the most active research and development, fluid loss reducer is an important part of drilling fluid. By forming a low-permeability, flexible, thin and dense filter cake on the well wall, it can reduce The effect of fluid loss on drilling fluids. However, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F251/00C08F228/02C08F220/56C09K8/035
Inventor 杨超鲁娇陈楠张志智尹泽群刘全杰
Owner CHINA PETROLEUM & CHEM CORP
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