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am/aa/n-β-cd polymer-ionic liquid [bquin]bf4 composite clay stabilizer and its synthesis method

A technology of composite clay and ionic liquid, which is applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of large amount of stabilizer and high price, and achieve improved temperature and salt resistance, enhanced adsorption capacity, and rigidity enhanced effect

Active Publication Date: 2017-11-28
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Their mechanism of action is mainly to block pores and micro-cracks, film adsorption, and wetting reversal, but this type of stabilizer also has the problem of large dosage and high price (Long Anhou, Yang Xinbin, etc. Organosilicon drilling fluid system And Its Application[J].Journal of Daqing Petroleum Institute.2002,26(4):28-30;Qin Yonghe.Study and Application of Anti-slump Mechanism of Silicate Drilling Fluid[J].Journal of China University of Petroleum: Natural Science Edition. 2007,31(3):67-71.)

Method used

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  • am/aa/n-β-cd polymer-ionic liquid [bquin]bf4 composite clay stabilizer and its synthesis method
  • am/aa/n-β-cd polymer-ionic liquid [bquin]bf4 composite clay stabilizer and its synthesis method
  • am/aa/n-β-cd polymer-ionic liquid [bquin]bf4 composite clay stabilizer and its synthesis method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1: Preparation of monomer N-β-CD

[0024] Add a certain amount of 1.5% sodium hydroxide solution 200mL into the single-necked flask, after cooling down to room temperature, add 0.05mol β-cyclodextrin (β-CD) and stir until clear, then add 0.05mol p-toluenesulfonate diluted with 30mL acetonitrile solution Acyl chloride, stirred and reacted at room temperature (20-25°C) for 2 hours. After the reaction was complete, the solution was refrigerated overnight in the refrigerator, vacuum filtered to obtain a white solid (OTs-β-CD), and dried in a 45°C oven Medium bake for 12 hours. Dissolve 2mmol OTs-β-CD in excess allylamine (100mmol), add a small amount of hydroquinone after complete dissolution, and reflux at 80°C for 2 days. base amine, and then dissolve the product with dimethylformamide (DMF), precipitate in a large amount of acetone, vacuum filter, and repeat 3 times to obtain the target product monohexa-allylamino β-cyclodextrin (N-β- CD), the product was ba...

Embodiment 2

[0025] Embodiment 2: Synthesis of AM / AA / N-β-CD terpolymer

[0026] In a 250ml three-necked flask, AM, AA, and N-β-CD monomers were first weighed according to the proportioning ratio of Table 1, and made into an aqueous solution with a total monomer mass percentage concentration of 20%, and the pH was adjusted to 7 with NaOH solution. Nitrogen for 20 minutes; then add the initiator ammonium persulfate solution and sodium bisulfite solution, the molar ratio of ammonium persulfate and sodium bisulfite is 1:1, the amount of the initiator added is 0.5% of the total mass of the monomer, and continue to feed nitrogen 10-20min, react at a temperature of 35°C for 4-8 hours; finally wash three times with absolute ethanol, pulverize and dry to obtain the AM / AA / N-β-CD terpolymer.

[0027] Table 1 Addition amount of ternary polymer synthetic drugs

[0028]

Embodiment 3

[0029] Embodiment 3: Tetrafluoroboric acid 1-n-butyl-quinoline salt ([bquin]BF 4 )Synthesis

[0030] Quinoline (0.05mol) and n-butyl bromide (0.05mol) were refluxed at 60°C for 48 hours, and the product was washed with ethyl acetate (100mL×3) to generate wine red 1-n-butyl-quinoline bromide ( [bquin] Br). [bquin]Br (0.05mol) and sodium fluoroborate (NaBF 4 , 0.05mol) dissolved in acetonitrile, stirred and refluxed at 60°C for 3 days for ion exchange, filtered off the resulting white solid, removed the acetonitrile solvent by rotary evaporation, and dried under vacuum at 50°C for 10 hours to obtain light yellow 1-n-butyl tetrafluoroboric acid -Quinolinate ([bquin]BF 4 ).

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Abstract

The invention relates to a polymer-ionic liquid composite clay stabilizer used for restraining clay hydration expansion in petroleum industry and a synthesis method of the polymer-ionic liquid composite clay stabilizer. The synthesis method comprises the steps of: reacting single 6-allyl amino beta-cyclodextrin, acrylamide and acrylic acid under initiation of ammonium persulfate and sodium hydrogen sulfite in an aqueous solution under the condition of pH of 7 and the temperature of 35 DEG C, purifying by aqueous solution after 8 hours of reaction and drying to obtain a polymer; refluxing quinoline and n-butyl bromide for 48 hours at 60 DEG C to obtain brominated 1-normal-butyl-quinoline salt, stirring for 3 days with sodium fluoborate in acetonitrile, filtering, carrying out rotary evaporation and drying to obtain tetrafluoroborate 1-normal-butyl-quinoline salt ([bquin]BF4); refluxing the polymer and the [bquin]BF4 for 4 hours at 50 DEG C to obtain a polymer-ionic liquid compound. The polymer-ionic liquid compound has good water solubility, stability and clay expansion restraining power and the antiswelling rate to bentonite can reach 90.3%.

Description

technical field [0001] The invention relates to a polymer-ionic liquid clay stabilizer used in petroleum industry to suppress hydration expansion of clay and a synthesis method thereof. Background technique [0002] Hydration swelling of clay minerals exists in many links of oil and gas exploitation, and its suppression or control is a difficult problem in oil and gas well drilling, especially in shale gas reservoir drilling and effective water injection engineering in low permeability oil fields. The interaction between a large amount of clay minerals contained in the shale formation and the working fluid, especially after the clay meets water, the hydration swelling and migration will bring many problems to oil and gas development, such as wellbore instability during drilling, various Various downhole complex situations and accidents, oil and gas layer damage during drilling and well completion, stimulation effects, large-area structural stress changes and casing damage du...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F290/10C08F220/56C08F220/06C08F8/42C08B37/16C09K8/575C09K8/508
Inventor 刘向君蒋文超苟绍华梁利喜罗珊胡海
Owner SOUTHWEST PETROLEUM UNIV
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