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Hydrophobic association crosslinked polymer coil and preparation method thereof

A cross-linked polymer, associative technology, applied in drilling compositions, chemical instruments and methods, etc., can solve problems such as reducing the economy of injection systems, and achieve the effect of improving the effect of heterogeneity

Active Publication Date: 2013-09-04
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it is also found in the application of mines that for higher permeability reservoirs (permeability greater than 1000 mD), or medium and low permeability reservoirs with higher permeability bands, in order to obtain better plugging Effect, in the early stage of the test, it is necessary to increase the mass fraction of water-soluble cross-linked polymer coils in the injection solution, which reduces the economy of the injection system

Method used

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  • Hydrophobic association crosslinked polymer coil and preparation method thereof
  • Hydrophobic association crosslinked polymer coil and preparation method thereof
  • Hydrophobic association crosslinked polymer coil and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Embodiment 1, the preparation of hydrophobic association type cross-linked polymer coil

[0044] (1) Preparation of the oil phase: Weigh 110.0 grams of base oil isoparaffins (produced by the isomerization dewaxing unit of Daqing Refining and Chemical Company) (viscosity 10.85cP, flash point 178°C), and add it to a stirring 250 In the milliliter three-necked flask, add 57.4 gram sorbitan monooleate (Span-80, HLB value 4.3) and 32.6 gram sorbitan monostearate polyoxyethylene (20) ethers (Tween-60, The HLB value is 14.9) two kinds of non-ionic surfactants, mixed uniformly as the oil phase;

[0045] (2) Prepare the water phase: Weigh 58.9 grams of conventional water-soluble monomer acrylamide, 33.8 grams of sodium acrylate, water-soluble cross-linking monomer N, N'-diallyl-N, N, N', N' -Tetramethylhexammonium chloride 6.8 grams, its molecular structure contains two double bonds, hydrophobic monomer N, N '-dimethyl-N-p-vinyl benzyl octadecyl ammonium chloride 5.4 grams, It...

Embodiment 2

[0050] Embodiment 2, preparation of hydrophobic association type cross-linked polymer coils

[0051] (1) Preparation of the oil phase: Weigh 110.0 grams of base oil isoparaffins (produced by the isomerization dewaxing unit of Daqing Refining and Chemical Company) (viscosity 10.85cP, flash point 178°C), and add it to a stirring 250 In the milliliter three-necked flask, add 57.4 gram sorbitan monooleate (Span-80, HLB value 4.3) and 32.6 gram sorbitan monostearate polyoxyethylene (20) ethers (Tween-60, HLB value is 14.9) two kinds of nonionic surfactants, 12.5 milligrams of pyrolysis type initiator azobisisoheptanonitrile, after mixing homogeneously as oil phase;

[0052] (2) Prepare the water phase: Weigh 58.9 grams of conventional water-soluble monomer acrylamide, 33.3 grams of sodium acrylate, water-soluble cross-linking monomer N, N'-diallyl-N, N, N', N' -Tetramethylhexammonium chloride 6.8 grams, its molecular structure contains two double bonds, hydrophobic monomer N, N '-...

Embodiment 3

[0057] Embodiment 3, the preparation of hydrophobic association type cross-linked polymer coil

[0058] (1) Preparation of the oil phase: Weigh 110.0 grams of base oil isoparaffins (produced by the isomerization dewaxing unit of Daqing Refining and Chemical Company) (viscosity 10.85cP, flash point 178°C), and add it to a stirring 250 In the milliliter three-necked flask, add 57.4 gram sorbitan monooleate (Span-80, HLB value 4.3) and 32.6 gram sorbitan monostearate polyoxyethylene (20) ethers (Tween-60, The HLB value is 14.9) two kinds of non-ionic surfactants, mixed uniformly as the oil phase;

[0059] (2) Prepare the water phase: Weigh 58.9 grams of conventional water-soluble monomer acrylamide, 33.8 grams of sodium acrylate, water-soluble cross-linking monomer N, N'-diallyl-N, N, N', N' - 6.8 grams of tetramethylhexammonium chloride, its molecular structure contains two double bonds, 4.8 grams of hydrophobic monomer 2-acrylamido hexadecyl sodium sulfonate, its molecular str...

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Abstract

The invention provides a hydrophobic association crosslinked polymer coil and a preparation method thereof. The preparation method comprises the following steps of: (1) dissolving a surfactant and an oil-soluble initiator in base oil, and taking the base oil in which the surfactant and the oil-soluble initiator are dissolved as an oil phase; (2) dissolving hydrophobic monomer, water-soluble crosslinking monomer, conventional water-soluble monomer and a water-soluble initiator in water to obtain an aqueous solution with total mass percentage content of 20-70 percent, which serves as an aqueous phase; (3) mixing the aqueous phase in the step (2) and an oil phase in the step (1) for emulsification to obtain W / O type miniemulsion of which the dispersed phase is the aqueous phase and the continuous phase is the oil phase; and (4) introducing inert gas into the W / O type miniemulsion formed in the step (3) to initiate polymerization reaction to obtain the hydrophobic association crosslinked polymer coil in the W / O type miniemulsion. The hydrophobic association crosslinked polymer coil miniemulsion profile control agent aqueous solution system is particularly suitable for high permeability oil deposits.

Description

technical field [0001] The invention relates to a hydrophobic association type crosslinked polymer coil and a preparation method thereof, belonging to the technical field of petroleum exploitation. Background technique [0002] At present, the early development of oil fields has gradually entered the middle and late stages of water flooding. How to further improve the volumetric sweep coefficient of injected water and the displacement efficiency within the water sweep volume, and economically and effectively exploit existing oil fields is a major issue to be solved urgently by the petroleum industry. One, in which the development and application of enhanced oil recovery technology has played an important role. [0003] Enhanced oil recovery technology involves many aspects, and the methods based on improving the displacement effect can be divided into two categories: increasing the volumetric sweep coefficient of the injected fluid and improving the oil washing efficiency in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/56C08F220/06C08F226/04C08F212/14C08F220/58C08F2/32C08F4/40C08F6/16C09K8/588
Inventor 郑晓宇张健秦颖杨俊茹马玉华李先杰崔盈贤
Owner CHINA NAT OFFSHORE OIL CORP
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