Synthesis method for amphoteric ion modified starch for well drilling fluid

A technology of zwitterions and synthetic methods, which is applied in drilling compositions, chemical instruments and methods, sulfonate preparation, etc., can solve the problem of inability to achieve the "reverse polyelectrolyte" effect, and the imbalance between polymer hydration performance and inhibition performance , Salt and calcium resistance of polymers, etc.

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

AI Technical Summary

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] First prepare methacryloyloxyethyl-N,N-dimethylpropanesulfonate (DMAPS)

[0026] Weigh 630gDM and put it into the reactor, then put it into the constant temperature water bath, heat and start stirring. Then weigh 122g PS, add it directly into DM, the reaction temperature is 35°C, stir and react for 1.5h to get the crude product of DMAPS. Transfer the crude DMAPS product to a large piece of filter paper, wrap it in a Soxhlet extractor, and use ethanol as a solvent to extract it for 1 hour. After the extraction, put the filter paper bag in a drying oven and dry it at 40°C to obtain The pure DMAPS monomer has a yield of 92.8%, (the yield is the ratio of the mass of the product actually obtained and the mass of the theoretical product obtained by the stoichiometric reaction).

Embodiment 2

[0032] Weigh 100g of starch and add deionized water to gelatinize at 60°C for 30min, 2 After 30min, add 5g of potassium persulfate, weigh 100g of AM and 170g of DMAPS in deionized water to dissolve and transfer to the gelatinized starch reactor. The total mass concentration of the monomer is 25%. Washing yielded a white precipitate. The white precipitate was dried at 70°C for 12 hours and crushed to obtain the final product.

Embodiment 3

[0034]Weigh 100g of starch and add deionized water to gelatinize at 60°C for 30 min, 2 After 30 min, add 3 g of potassium persulfate, weigh 80 g of AM and 150 g of DMAPS in deionized water to dissolve and transfer to the gelatinized starch reactor. The total mass concentration of the monomer is 20%. Washing yielded a white precipitate. The white precipitate was dried at 70°C for 12 hours and crushed to obtain the final product.

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Abstract

The invention provides a synthesis method for amphoteric ion modified starch for a well drilling fluid, wherein the synthesis method comprises the steps: weighing dimethylaminoethyl methacrylate and 1,3-propanesultone with the mass ratio of 2:1 to 9:1, adding 1,3-propanesultone to dimethylaminoethyl methacrylate, after reaction, filtering, extracting, and drying to obtain DMAPS; adding water to starch, stirring to obtain gelatinized starch, introducing N2, carrying out a reaction, and then adding an initiator; and dissolving acrylamide and DMAPS 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 a modified starch used in drilling fluid in the process of petroleum drilling and a synthesis method thereof, in particular to a synthesis 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 fl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F251/00C08F220/56C08F220/38C09K8/035C07C303/32C07C309/14
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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