A kind of synthetic method of zwitterionic copolymer for drilling fluid

A technology of zwitterions and synthetic methods, which is applied in the direction of drilling compositions, chemical instruments and methods, sulfonate preparation, etc., which can solve the problems of inability to achieve the "reverse polyelectrolyte" effect, unequal quantities, polymer salt resistance Limited anti-calcium performance and other problems, to achieve the effect of increasing the hydrodynamic volume, increasing the steric resistance, and improving the performance of temperature resistance

Active Publication Date: 2017-09-29
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 the polymerization activity and reactivity ratio of cationic monomers, the anion content in the copolymer is much greater than the cation content, resulting in the unequal number of positive and negative charges in the copolymer, which cannot achieve the ideal "reverse polyelectrolyte" effect. Salt and calcium resistance is limited

Method used

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  • A kind of synthetic method of zwitterionic copolymer for drilling fluid
  • A kind of synthetic method of zwitterionic copolymer for drilling fluid
  • A kind of synthetic method of zwitterionic copolymer for drilling fluid

Examples

Experimental program
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Effect test

Embodiment 1

[0025] First prepare N,N-dimethylallyl propane sulfonate.

[0026] 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

[0032] Weigh 103gDAPS and 35gAM respectively, add a certain amount of deionized water to dissolve and transfer to the reactor, the total monomer concentration is 35%. Access to N 2Deoxygenation was performed for 1 hour, and the temperature was raised to 60° C., kept for 30 minutes, and then 0.7 g of potassium persulfate was added. After 6 hours of reaction, a gel-like solid was obtained, which was precipitated with acetone to obtain a white precipitate. After drying at 110°C for 24 hours, it was pulverized to obtain a DAPS / AM zwitterionic copolymer.

Embodiment 3

[0034] Weigh 60gDAPS, 50gAM, 15gNaCl respectively, add a certain amount of deionized water to dissolve and transfer to the reactor, the total monomer concentration is 40%. Access to N 2 Deoxygenation was performed for 1 hour, and the temperature was raised to 55° C., kept for 30 minutes, and then 0.75 g of ammonium persulfate was added. After 5 hours of reaction, a gel-like solid was obtained, which was precipitated with acetone to obtain a white precipitate. After drying at 110°C for 24 hours, it was pulverized to obtain a DAPS / AM zwitterionic copolymer.

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Abstract

The invention provides a synthesis method for an amphoteric ion copolymer for a well drilling fluid, wherein the synthesis method comprises the steps: respectively weighing N,N-dimethylallylamine and 1,3-propanesultone with the molar ratio of 2:1 to 8:1, adding 1,3-propanesultone to N,N-dimethylallylamine, carrying out a reaction for 0.5-4 h at the temperature of 10-60 DEG C, finally, filtering, extracting, and drying to obtain N,N-dimethylallyl propanesulfonate (DAPS); adding the obtained DAPS and AM into a solvent, dissolving, then transferring into a reactor, then introducing N2, carrying out a deoxygenation reaction, next adding an initiator, carrying out a reaction to obtain a colloidal solid, and precipitating with acetone to obtain a white precipitate; and drying the obtained precipitate, and then crushing to obtain the amphoteric ion copolymer. The copolymer obtained by the method can sustain a temperature as high as 180 DEG C, resists NaCl saturation, resists CaCl2 saturation, 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 drilling fluid polymer used in the oil drilling process and a synthesis method thereof, in particular to a synthesis method of a zwitterionic copolymer for drilling fluid. Background technique [0002] Polymers used in drilling fluids involve a wide variety of complex and diverse functions, but fluid loss control agents are the most important and the most used polymer treatment agents. Filtrate reducer is an important drilling fluid treatment agent used to ensure the stability of drilling fluid performance, reduce the invasion of harmful liquids into the formation, and ensure regular well diameter and stable well wall. With the increasingly complex formations encountered and the increase in the number of special wells, ultra-deep wells and complex wells, higher requirements are put forward for drilling fluid fluid loss control agents to meet the salt tolerance (NaCl concentration greater than 10%, CaCl 2 Concentration greate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F226/02C08F220/56C07C303/32C07C309/14C09K8/035
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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