A kind of preparation method of zwitterionic copolymer for drilling fluid

A zwitterionic and copolymer technology, applied in drilling compositions, chemical instruments and methods, etc., can solve the problem that the polymer has limited salt resistance and calcium resistance, cannot achieve the "reverse polyelectrolyte" effect, and the quantity is not equal, etc. problems, to achieve the effect of increasing the hydrodynamic volume, easy cleaning and maintenance, and short response time

Active Publication Date: 2017-08-22
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 preparation method of zwitterionic copolymer for drilling fluid
  • A kind of preparation method of zwitterionic copolymer for drilling fluid
  • A kind of preparation method of zwitterionic copolymer for drilling fluid

Examples

Experimental program
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Effect test

Embodiment 1

[0032] First prepare methacryloyloxyethyl-N,N-dimethylpropanesulfonate (DMAPS)

[0033] Weigh 630g of dimethylaminoethyl methacrylate (DM) into the reactor, then put it into a constant temperature water bath, heat and start stirring. Then 122g of 1,3-propane sultone (PS) was weighed and directly added to DM at a reaction temperature of 35°C. After stirring for 1.5h, the crude product of DMAPS was obtained. 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

[0039] Preparation of 4-vinylpyridinepropanesulfonic acid ylide (VPPS)

[0040] (1) Weigh 105g of 4-vinylpyridine (4-VP), 125g of 1,3-propane sultone (PS), 500g of organic solvent benzene, and 0.75g of diethylhydroxylamine;

[0041] (2) Divide the organic solvent benzene into three parts equally, dissolve and mix with 4-vinylpyridine, 1,3-propane sultone and auxiliary agent diethylhydroxylamine respectively;

[0042] (3) Add the obtained three mixed solutions into the reactor one by one, react at 70°C for 2h, then filter under reduced pressure, wash with benzene for 2-3 times, and dry at 50°C for 15h to obtain 4-ethylene Base pyridine propanesulfonic acid ylide, finally obtain 2136g of light yellow solid powder product through calculation.

Embodiment 3

[0044] Weigh 50gDMAPS, 60gAM and 40gVPPS respectively, add a certain amount of deionized water to dissolve and transfer to the reactor, the total monomer concentration is 35%. Access to N 2 Deoxygenation was performed for 1 hour, and the temperature was raised to 60° C., kept for 30 minutes, and then 0.9 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 finally obtain DMAPS / AM / VPPS zwitterionic copolymer.

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Abstract

The invention provides a preparation method for an amphoteric ion copolymer for a well drilling fluid, wherein the preparation 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; respectively weighing DMAPS, AM and VPPS in proportion, adding into a solvent, dissolving, then transferring into a reactor, then introducing N2, carrying out a deoxidization 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 finally 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 preparation method thereof, in particular to a preparation 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 gr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/56C08F220/38C08F226/06C09K8/035
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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