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Temperature-resistant salt-resistant efficient gel, and preparation and use thereof

A temperature-resistant, salt-resistant, high-efficiency technology, applied in the fields of polymer materials and oilfield chemistry, can solve problems such as poor salt resistance, poor anti-aging stability, and high polymer dosage

Inactive Publication Date: 2009-07-08
CHENGDU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the above-mentioned gel system used in the oil field is mainly partially hydrolyzed polyacrylamide (HPAM) gel, but the HPAM gel system has the following shortcomings: poor temperature resistance (below 80 ° C), poor salt resistance ( less than 10000mg / L), prone to excessive cross-linking, gel dehydration, low system elasticity, and poor long-term anti-aging stability
Liu Qingwang et al., Journal of Zhejiang University (Natural Science Edition), 2005, 32(3): 295-299, studied the composition and performance of cationic polyacrylamide weak gel modifier, and found that the concentration of 5g / L The highest gel viscosity after polymer gelation is 50000mPa.s, it can be seen that the amount of polymer used for gelation is relatively high

Method used

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  • Temperature-resistant salt-resistant efficient gel, and preparation and use thereof
  • Temperature-resistant salt-resistant efficient gel, and preparation and use thereof
  • Temperature-resistant salt-resistant efficient gel, and preparation and use thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 20.000 grams of acrylamide, 10.530 grams of acrylic acid, 3.500 grams of 4-vinylbenzyloctylphenol polyoxyethylene ether (the adduct EO of polyoxyethylene ether is 20), 3,5-bis(trifluoromethyl) Dissolve 1.410 grams of styrene and 5.630 grams of sodium lauryl sulfate in 460 mL of distilled water, add them to a three-necked reaction flask, adjust the pH of the solution to 8 with NaOH, the reaction temperature is 65 ° C, and pass N 2 After 30 minutes, add 9.50 mL of 0.05 mol / L potassium persulfate initiator solution, react for 36 hours, and dilute the polymer with water to obtain a concentrated PAH solution. Take a certain amount of polymer PAH to prepare the oil displacement agent aqueous solution sample, the sample is colorless and transparent. The polymer concentration is 0.4g / L, the total concentration of phenol and glutaraldehyde is 0.10g / L, the concentration of sodium dodecylbenzenesulfonate is 0.2mmol / L, and the aqueous solution of sodium sulfite concentration is 0.0...

Embodiment 2

[0030] 20.000 grams of acrylamide, 12.500 grams of 2-acrylamide-2-methylpropanesulfonic acid, 9.500 grams of 4-vinylbenzyl hexadecyl polyoxyethylene ether (the adduct EO of polyoxyethylene ether is 60) , 2.102 grams of 4-butylstyrene and 7.350 grams of sodium lauryl sulfate were dissolved in 670 mL of distilled water, added to a three-necked reaction flask, and the pH of the solution was adjusted to 7 with NaOH, the reaction temperature was 70 ° C, and N 2 After 30 minutes, add 11.60 mL of 0.05 mol / L potassium persulfate initiator solution, react for 32 hours, and dilute the polymer with water to obtain a concentrated PAH solution. Take a certain amount of polymer PAH to prepare the oil displacement agent aqueous solution sample, the sample is colorless and transparent. The concentration of the polymer is 1.8g / L, the concentration of oligophenolic resin is 0.40g / L, the concentration of sodium dodecylbenzenesulfonate is 0.2mmol / L, and the concentration of sodium sulfite is 0.04...

Embodiment 3

[0032] 20.000 grams of acrylamide, 9.600 grams of 3-acrylimido-3-methylbutanoic acid, 13.000 grams of allyl nonylphenol polyoxyethylene ether (the adduct EO of polyoxyethylene ether is 18), Dissolve 4.720 grams of hexylphenylstyrene and 21.800 grams of sodium lauryl sulfate in 750 mL of distilled water, add them to a three-necked reaction flask, adjust the pH of the solution to 5 with NaOH, the reaction temperature is 60 ° C, and pass through N 2 After 30 minutes, add 15.0 mL of 0.05 mol / L potassium persulfate initiator solution, react for 24 hours, and dilute the polymer with water to obtain a concentrated PAH solution. Take a certain amount of polymer PAH to prepare an oil displacement agent aqueous solution sample, and the sample is colorless and transparent. The polymer concentration is 1.0g / L, the total concentration of phenol and glutaraldehyde is 0.15g / L, the concentration of sodium dodecylbenzenesulfonate is 0.15mmol / L, and the aqueous solution of sodium sulfite concen...

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Abstract

The invention discloses a temperature resistant salt tolerant high efficiency gel and a preparation method and application thereof. The preparation method is characterized in that the preparation method comprises the following steps: preparing a comb-shaped associated copolymer PAH containing macromonomers and functional hydrophobic monomers into an aqueous solution having the concentration of 0.1 to 4g / L, the crosslinking agent concentration of 0.01 to 1.0g / L, the surfactant concentration of 0.01 to 8mmol / L and the sodium sulfite thermal stabilizer concentration of 0.005 to 1.0g / L; adding the aqueous solution into a mixing container with a stirring device; stirring the aqueous solution evenly at the room temperature; regulating the pH value of the solution to be equal to between 4 and 11, and obtaining a temperature resistant salt tolerant high efficiency gel polymer solution system used for tertiary oil recovery and scavenge, displacement modification, profile modification or water shutoff. The polymer solution system has micro-crosslinking to form the gel during the flowage inside the oil reservoir. The gel has good elasticity, not easy dehydration, stable gelling performance, and excellent tackification, temperature resistance, salt tolerance, shearing resistance and ageing resistance.

Description

1. Technical field [0001] The invention relates to a heat-resistant and salt-resistant high-efficiency gel, a preparation method and application thereof, and belongs to the fields of polymer materials and oil field chemistry. 2. Technical background [0002] Weak gel profile control technology is used in water injection wells to adjust the water absorption profile and improve the sweep efficiency, thereby enhancing oil recovery. The weak gel control and flooding technology is an enhanced oil recovery technology developed in recent years for deep treatment of water injection wells, with profile control and water shutoff effects and polymer flooding effects. This technology uses a polymer with a concentration close to that of polymer flooding, and adds a small amount of cross-linking agent to slowly form a weak gel in the formation. This technology can greatly increase the oil production of oil wells. Using flowable weak gel instead of polymer flooding can reduce the amount o...

Claims

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Application Information

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IPC IPC(8): C08F220/56C08F220/06C08F220/52C08F228/02C08F222/02C08F220/34C08F220/60C08F236/02C09K8/588C08J3/075
Inventor 钟传蓉王世高彭绣花蒋笙翠
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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