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Hydrophobically associating crosslinked polymer microspheres, preparation method and application

A technology of cross-linked polymers and hydrophobic association, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problem of poor temperature and salt resistance of polymer microspheres, high viscosity and stable volume of polymer microspheres Poor performance and other problems, to achieve significant temperature resistance and salt resistance, large space cross-linking density, and stable network structure

Active Publication Date: 2017-11-10
SHANDONG NUOER BIOLOGICAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] What the present invention aims to solve is the following problems existing in the preparation of oil field oil layer water blocking agent by adopting inverse emulsion polymerization method: inverse emulsion has poor volume stability, is relatively sensitive to temperature, stirring speed, etc., and the phenomenon of incomplete emulsification easily occurs, and Layering, the surface of polymer microspheres is easy to wrap the oligomers in the reaction system, resulting in high viscosity of polymer microspheres, it is difficult to enter the deep part of the bottom layer or requires high pressure to enter the deep part of the formation, and the space crosslinking density of polymer microspheres is small , the network structure is unstable, poor elasticity, poor plugging efficiency in formations with low water volume, poor temperature and salt resistance of polymer microspheres, and limited use in highly mineralized formations

Method used

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  • Hydrophobically associating crosslinked polymer microspheres, preparation method and application
  • Hydrophobically associating crosslinked polymer microspheres, preparation method and application
  • Hydrophobically associating crosslinked polymer microspheres, preparation method and application

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preparation example Construction

[0043] The preparation method of described sodium lauryl alcohol maleate comprises:

[0044]Mix dodecyl alcohol, maleic anhydride and an organic solvent, and react under the action of a catalyst at 80-85°C to obtain sodium dodecyl alcohol maleate;

[0045] Preferably, the molar ratio of said lauryl alcohol to said maleic anhydride is 1:1; and

[0046] The catalyst is S 2 o 8 2- / ZrO 2 -SiO 2 .

[0047] Lauryl alcohol sodium maleate used in the present invention is to be by lauryl alcohol and maleic anhydride by esterification synthesis monoester, then add alkali and make reactive emulsifier sodium lauryl alcohol maleate, its preparation method is : Mix dodecyl alcohol and maleic anhydride with a molar ratio of 1:1, and add an organic solvent, such as petroleum ether with a monomer mass of 50%, fully mix it and add it into a four-necked flask, and install a condenser on the four-necked flask. Stirrer, thermometer, 0.8% catalyst S 2 o 8 2- / ZrO 2 -SiO 2 Add it into a...

Embodiment 1

[0067] The weight parts of raw materials are: acrylamide 240, sodium acetate 17, N-dodecyl acrylamide 1.5, 2-acrylamide-2-methylpropanesulfonic acid 7, dimethyl diallyl ammonium chloride 17, N , N-methylenebisacrylamide 0.7, sodium hydroxide 1.3, deionized water 385.5, white oil 275, Tween804, Span80 22.1, reactive emulsifier sodium lauryl maleate 3 (Tween80, Span80 and reactive emulsifier The HLB value after mixing the agent is 5.5), octylphenol polyoxyethylene ether 25, azobisisobutyronitrile 0.3, potassium persulfate 0.02, sodium sulfite 0.3.

[0068] The preparation method is: add acrylamide, sodium acetate, N-dodecylacrylamide, 2-acrylamide-2-methylpropanesulfonic acid, dimethyl diallyl ammonium chloride, N,N-methylenebisacrylamide and water, mix well and adjust the pH value to 6.8 with sodium hydroxide, then add white oil, Tween80, Span80, reactive emulsifier and initiator azobisisobutyronitrile , Potassium persulfate, stirred at high speed for 2 minutes, transferred to...

Embodiment 2

[0071] The parts by weight of raw materials are: acrylamide 270, sodium acetate 22, styrene 1, 2-acrylamide-2-methylpropanesulfonic acid 11, dimethyl diallyl ammonium chloride 12, N,N-methylene Bisacrylamide 0.3, sodium hydroxide 2.1, deionized water 351.6, white oil 285, Tween80 2.7, Span80 15, reactive emulsifier sodium lauryl maleate 2 (HLB after mixing Tween80, Span80 and reactive emulsifier Value is 5.0), octylphenol polyoxyethylene ether 25, azobisisobutyronitrile 0.3, potassium persulfate 0.02, sodium sulfite 0.3.

[0072] The preparation method is: add acrylamide, sodium acetate, styrene, 2-acrylamide-2-methylpropanesulfonic acid, dimethyl diallyl ammonium chloride, N,N-methylene base bisacrylamide and water, mix well and adjust the pH value to 7.0 with sodium hydroxide, then add white oil, Tween80, Span80, reactive emulsifier and initiator azobisisobutyronitrile, potassium persulfate Stir for 2 minutes, transfer to the reaction kettle, pass nitrogen to remove oxygen ...

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Abstract

The invention relates to hydrophobically associating crosslinked polymer microspheres. The hydrophobically associating crosslinked polymer microspheres are prepared from acrylamide, sodium acetate, a hydrophobic monomer, alkenyl sulfonic acid, a cationic monomer and a crosslinking agent through inverse emulsion polymerization, wherein the hydrophobic monomer is selected from one or more of methyl methacrylate, styrene, vinyltrimethylsilane, N-dodecylacrylamide and N-n-butylphenyl acrylamide. The provided hydrophobically associating crosslinked polymer microspheres have obvious temperature resistance and salt tolerance, large space crosslink density, stable network structure and better viscoelasticity; meanwhile, the expansion rate of the hydrophobically associating crosslinked polymer microspheres can be controlled to a certain extent; the hydrophobically associating crosslinked polymer microspheres have low viscosity and better stability, can be prepared from oilfield waste water through dilution, and can enter the deep formation successfully under lower pressure and block the matched formation after expansion in water.

Description

technical field [0001] The invention relates to the technical field of profile control and water shutoff of oil layers in oil fields, in particular to a hydrophobic association crosslinked polymer microsphere, a preparation method and an application. Background technique [0002] Water production from oil wells has become a widely encountered problem in crude oil extraction, and these problems will greatly affect the production and benefits of oil fields, and the oil field production by water flooding is one of the most severely affected locations. In the later stage of water flooding development, oil wells often produce water. Therefore, the problem of oilfield water plugging and profile control is becoming more and more serious. At present, the most widely used method in oil fields is to cross-link polyacrylamide aqueous solution and cross-linking agent for selective water shutoff. The current polyacrylamide profile control and water shutoff technology still has many lim...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F220/54C08F220/58C08F226/02C08F222/38C08F222/14C08F2/32C08F212/08C08F220/14C08F230/08C09K8/512
CPCC08F2/32C08F220/56C09K8/512C09K8/887C08F220/54C08F220/585C08F226/02C08F222/385C08F222/14C08F212/08C08F220/14C08F220/34C08F230/08
Inventor 荣敏杰孙建波许永升于庆华荣帅帅
Owner SHANDONG NUOER BIOLOGICAL TECH
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