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Synthesis method for amphoteric ion copolymer for well drilling fluid

A technology of zwitterions and synthetic methods, applied in drilling compositions, chemical instruments and methods, sulfonate preparation, etc., can solve the problem of polymers with limited anti-salt and anti-calcium properties and failure to achieve the "reverse polyelectrolyte" effect , the quantity is not equal, etc., to achieve the effect of increasing the hydrodynamic volume, increasing the steric resistance, and improving the performance of temperature resistance

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 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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  • Synthesis method for amphoteric ion copolymer for well drilling fluid
  • Synthesis method for amphoteric ion copolymer for well drilling fluid
  • Synthesis method for amphoteric ion copolymer 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 DMAPS and 60g of AM respectively, add a certain amount of deionized water to dissolve and transfer to the reactor, the total monomer concentration is 40%. Access to N 2Deoxygenation was performed for 1 hour, while the temperature was raised to 65° C., kept for 30 minutes, and then 0.5 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 DMAPS / AM zwitterionic copolymer.

Embodiment 3

[0034] Weigh 130gDMAPS, 60gAM, 10gNaCl respectively, add a certain amount of deionized water to dissolve and transfer to the reactor, the total monomer concentration is 30%. Access to N 2 Deoxygenation was carried out for 1 hour, and the temperature was raised to 55° C., kept for 30 minutes, and then 0.9 g of ammonium persulfate was added. After reacting for 5 hours, 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 DMAPS-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: 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 the obtained DMAPS and AM into a solvent, dissolving, then transferring into a reactor, next introducing N2, carrying out a deoxidization reaction, at the same time, heating up to 50-70 DEG C, then 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 finally obtain the amphoteric ion copolymer. The copolymer obtained by the method can sustain a temperature as high as 150 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 Concentratio...

Claims

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Application Information

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IPC IPC(8): C08F220/38C08F220/56C09K8/035C09K8/24C07C309/14C07C303/32
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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