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Modified ternary copolymer, preparation method and applications thereof

An acrylate terpolymer and copolymer technology, applied in chemical instruments and methods, drilling compositions, etc., can solve problems such as low apparent viscosity, low anti-oxidation performance, and polymer chain degradation

Active Publication Date: 2013-09-25
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the low apparent viscosity of polyacrylamide / 2-acrylamido-2-methyl propane sulfonate / acrylic acid salt obtained at present and the defect that the low anti-oxidation performance easily causes the degradation of macromolecule chain , providing a polyacrylamide polymer product with high apparent viscosity and anti-oxidation performance and a preparation method thereof

Method used

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  • Modified ternary copolymer, preparation method and applications thereof
  • Modified ternary copolymer, preparation method and applications thereof

Examples

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preparation example Construction

[0017] According to the preparation method of modified acrylamide / 2-acrylamido-2-methylpropanesulfonate / acrylate terpolymer of the present invention, the method may further comprise the steps:

[0018] (1) Purifying the crude product of 2-acrylamido-2-methylpropanesulfonic acid to a content of impurity 2-methyl-2-propene-1-sulfonic acid≤100ppm;

[0019] (2) Prepare an aqueous monomer solution of acrylamide and purified 2-acrylamido-2-methylpropanesulfonic acid, adjust the pH to 5-10 with an inorganic basic compound, and obtain acrylamide / 2-acrylamido-2 - methyl propane sulfonate monomer aqueous solution;

[0020] (3) Under the conditions of aqueous solution polymerization, under the protection of an inert gas, the initiator system is contacted with the above-mentioned acrylamide / 2-acrylamido-2-methylpropanesulfonate monomer aqueous solution, so that the acrylamide / 2-propene Amido-2-methylpropanesulfonate is polymerized to obtain acrylamide / 2-acrylamide-2-methylpropanesulfonate ...

Embodiment 1

[0062] This example is used to illustrate the modified terpolymer and its preparation method according to the present invention.

[0063] (1) Purification of 2-acrylamido-2-methylpropanesulfonic acid

[0064] at 1m 3 Add 600 liters of absolute ethanol to the reaction kettle, add 200 kg of 2-acrylamido-2-methylpropanesulfonic acid crude product under stirring, control the temperature at 20°C, and filter and separate the solid after stirring for 2 hours. After the solid was dried in vacuo, 198 kg of dried solid was obtained. Dissolve the solid in 700 liters of acetic acid aqueous solution with an acetic acid concentration of 88% by weight, then add 30 kg of activated carbon powder, stir at 35°C for 60 minutes, and filter to obtain a filtrate, which is then crystallized at 5°C for 4 hours After the crystallized solution was filtered and vacuum-dried at 90° C. for 10 hours, 151 kg of 2-acrylamido-2-methylpropanesulfonic acid product was obtained with a yield of 75.5% and a produ...

Embodiment 2

[0076] This example is used to illustrate the modified acrylamide / 2-acrylamido-2-methylpropanesulfonate sodium / sodium acrylate terpolymer and its preparation method according to the present invention.

[0077] Add 250 kg of AM and 750 kg of purified AMPS (mps) and 2330 kg of deionized water into the batching kettle. Under stirring, control the solution temperature to 15°C with frozen brine, and add sodium hydroxide to adjust the pH to 5. Pump the monomer solution into the polymerization tank, add 500 grams of water-soluble azo initiator 2,2'-azo(2-amidinopropane) dihydrochloride and reducing agent N, N, N', N' - 500 grams of tetramethylethylenediamine, deoxygenated by passing high-purity nitrogen for 0.5 h, adding 500 grams of sodium bisulfite and 500 grams of ammonium persulfate, continuing to pass nitrogen until the thermocouple in the polymerization kettle starts to heat up, and the reaction time is 6 hours. Open the ball valve at the bottom of the reactor, press out the ob...

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Abstract

The present invention provides a modified AMPS / AM / acrylate ternary copolymer and a preparation method thereof. The method comprises: (1) purifying an AMPS crude product to achieve a content of an impurity MPS of less than or equal to 100 ppm, (2) preparing acrylamide and the purified AMPS monomer aqueous solution, and adopting an inorganic basic compound to adjust the pH value to 5-10 to obtain an AM / AMPS salt aqueous solution, (3) under an aqueous solution polymerization condition, in the presence of an initiation system and under the protection of an inert gas, carrying out polymerization on the AM / AMPS salt aqueous solution, and (4) carrying out granulation on the reaction product obtained from the step (3) to obtain colloidal particles, and carrying out contacting of the colloidal particles, sodium hydroxide and carbon disulfide, wherein the initiation system comprises a water-soluble azo initiator, an amine reducing auxiliary agent, a sulfite reducing agent and an oxidizing agent. The invention further relates to applications of the modified ternary copolymer. The modified ternary copolymer has high apparent viscosity and high apparent viscosity retention rate.

Description

technical field [0001] The invention relates to a modified acrylamide / 2-acrylamide-2-methylpropanesulfonate / acrylic acid salt terpolymer, its preparation method and application. Background technique [0002] The development of petroleum engineering and technology requires maximizing the recovery of existing oil fields. As the main polymer oil displacement agent, partially hydrolyzed polyacrylamide (HPAM) has been popularized and applied on a large scale in conventional oil reservoir EOB technology, and has played an important role in stabilizing and increasing oilfield production. With the reduction of reserves in conventional oil reservoirs, the application of HPAM in high-temperature and high-salt reservoirs faces many difficulties, mainly reflected in the combination of high temperature, high salinity and dissolved oxygen conditions in the development of high-temperature and high-salt reservoirs, which makes HPAM The viscosity of the solution is greatly reduced, resultin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F220/58C08F220/06C08F8/34C08F4/40C09K8/588
Inventor 伊卓黄凤兴齐兰芝赵方园穆晓蕾刘希
Owner CHINA PETROLEUM & CHEM CORP
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