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Sulfonate hydroxymethyl polyacrylamide and synthesis method thereof

A technology of sulfonic acid hydroxymethyl polyacrylamide and sulfonic hydroxymethyl polyacrylamide, which is applied in chemical instruments and methods, drilling compositions, etc., can solve problems such as inability to meet practical application conditions, and achieve The effect of low production cost, less time-consuming and simple operation method

Inactive Publication Date: 2019-01-25
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the research on plugging agents with high temperature resistance, acid resistance and alkali corrosion resistance at home and abroad can not meet the actual application situation.

Method used

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  • Sulfonate hydroxymethyl polyacrylamide and synthesis method thereof
  • Sulfonate hydroxymethyl polyacrylamide and synthesis method thereof
  • Sulfonate hydroxymethyl polyacrylamide and synthesis method thereof

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preparation example Construction

[0027] The invention discloses a preparation method of sulfonic acid methylol polyacrylamide, which specifically comprises the following steps:

[0028] Step 1, mix polyacrylamide (PAM) and purified water according to the ratio of material to liquid (2-3) g: (10-20) mL, and stir until PAM is fully dissolved to obtain a PAM solution;

[0029] Step 2, mix sodium bisulfite (NaHSO 3 ) and purified water, stirred to NaHSO 3 fully dissolved to produce NaHSO 3 Solution; mix PAM solution and NaHSO according to volume ratio (20-40):(5-8) 3 solution and stir evenly to prepare mixed solution A;

[0030] Step 3, adjust the pH value of the mixed solution A to 9-11 through a sodium hydroxide (NaOH) solution with a mass fraction of 30-40%, to obtain a mixed solution B, and place the mixed solution B in a three-necked flask;

[0031] Step 4, adding formaldehyde (HCHO) to the mixed solution B, so that the mass fraction of the added formaldehyde in the mixed solution is 4-5%, to obtain the ...

Embodiment 1

[0042] Prepare PAM solution according to the solid-liquid ratio of 2.5:15, and prepare NaHSO according to the solid-liquid ratio of 0.5:6 3 Solution, mix PAM solution and NaHSO according to volume ratio 20:8 3 solution and stirred evenly to prepare mixed solution A; adjust the pH value of mixed solution A to 10 by mass fraction of 30% NaOH solution to obtain mixed solution B, and place mixed solution B in a three-necked flask; add formaldehyde to make formaldehyde in The mass fraction in the reaction solution is 4%, and the mixed solution C is prepared; the mixed solution C is heated to 70°C, and reacted at this temperature for 2 hours to obtain a colorless and transparent liquid D; the liquid D is separated by absolute ethanol to obtain a precipitate , and dried the precipitate at 55°C to obtain a white solid, which is a sulfonic acid methylol polyacrylamide copolymer.

Embodiment 2

[0044] Prepare 2:20 PAM solution according to the ratio of solid to liquid, prepare NaHSO according to the ratio of solid to liquid 0.5:8 3 Solution, mix PAM solution and NaHSO according to volume ratio 20:6 3 solution and stirred evenly to prepare mixed solution A; adjust the pH value of mixed solution A to 9 by mass fraction of 40% NaOH solution to obtain mixed solution B, and place mixed solution B in a three-necked flask; add formaldehyde to make formaldehyde in The mass fraction in the reaction solution is 5%, and the mixed solution C is prepared; the mixed solution C is heated to 75°C, and reacted at this temperature for 4 hours to obtain a colorless and transparent liquid D; the liquid D is separated by absolute ethanol to obtain a precipitate , Dry the precipitate at 60°C to obtain a white solid, which is a sulfonic acid methylol polyacrylamide copolymer.

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Abstract

The invention discloses sfonate hydroxymethyl polyacrylamide and a synthesis method thereof. The product has great molecular weight, and excellent acid resistance, alkali resistance and high-temperature resistance. The resources of raw materials such as polyacrylamide, formaldehyde solution and purified water used by the synthesis method are wide; the production cost is low. Compared with N-hydroxymethylation reaction of partial hydrolysis polyacrylamide and formaldehyde in the prior art, the method has the advantages that the reaction conditions are mild; the operation method is simple; special instruments are not needed; the consumed time is little; formaldehyde and polyacrylamide are used for performing hydroxymethylation reaction to generate hydroxymethylated polyacrylamide; the generated hydroxymethyl (-CH2OH) substitutes one hydrogen on the amide group; hydroxymethylated polyacrylamide and sodium hydrogen sulfate take sulfomethylation reaction; the sfonate hydroxymethyl polyacrylamide is generated; hydroxy (-OH) on a part of hydroxymethyl is substituted by sodium sulfonate group (-SO3Na). The modified polyacrylamide can achieve a qualitative modification effect; the relativemolecular mass of the product is high; the treatment process is simple.

Description

【Technical field】 [0001] The invention belongs to the technical field of petroleum exploitation, and relates to a sulfonic acid methylol polyacrylamide and a synthesis method thereof. 【Background technique】 [0002] In the process of oilfield development, the water content of old oilfields is getting higher and higher, the oil production rate is gradually decreasing, and the degree of oil recovery is declining. The water out of the oil layer will bring many serious problems to the oilfield development, and even lead to the failure of the oilfield to continue production. In the high water cut period, the water injected from the water injection well can cause a large amount of scour to the formation. A large amount of oil remains in the formation and cannot be recovered. Water plugging refers to the operation of plugging high-permeability layers from oil wells. The purpose of water plugging is to change the flow direction of water in water flooding oil and control the flow of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F8/36C08F8/02C08F120/56C09K8/508
CPCC08F8/02C08F8/36C09K8/5083C08F120/56
Inventor 郭睿李秀环霍文生冯文佩刘雪艳张瑶韩双高弯弯
Owner SHAANXI UNIV OF SCI & TECH
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