Self-association linked polymer coils and preparation method thereof

A cross-linked polymer and associative technology, which is applied in the direction of drilling compositions, chemical instruments and methods, can solve the problems of reducing the economy of the injection system, and achieve the effect of improving the effect of heterogeneity

Inactive Publication Date: 2017-03-01
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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  • Self-association linked polymer coils and preparation method thereof
  • Self-association linked polymer coils and preparation method thereof
  • Self-association linked polymer coils and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Embodiment 1, the preparation of self-associated cross-linked polymer coils:

[0045] (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;

[0046] (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, 5.4 grams of hydrophobic monomer N, N'-dimethyl-N-p-vinylbenzyl octadecyl ammonium chloride, Its molecula...

Embodiment 2

[0051] Embodiment 2, the preparation of self-associated cross-linked polymer coils:

[0052] (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;

[0053] (2) Preparation of 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 '-dimethyl-...

Embodiment 3

[0058] Embodiment 3, the preparation of self-associated cross-linked polymer coils:

[0059] (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;

[0060] (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 structure contains...

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Abstract

The invention provides a self-association linked polymer coils and a preparation method thereof. The preparation method comprises the following steps: 1) dissolving a surfactant and an oil-soluble initiator in base oil as an oil phase; 2) dissolving a hydrophobic monomer, a water-soluble crosslinking monomer, a conventional water-soluble monomer and a water-soluble initiator in water to prepare an aqueous solution with total mass percentage content of 20-70% as a water phase; 3) mixing the water phase in the step 2) and the oil phase in the step 1) and emulsifying a mixture to form a W/O-type microemulsion with a dispersion phase as the water phase and a continuous phase as the oil phase; and 4) introducing ginert gas in the W/O-type microemulsion formed in the step 3) to initiate a polymerization to obtain the self-association linked polymer coils. A modifying and flooding agent aqueous solution system by using the self-association linked polymer coils is especially suitable for high-permeability oil reservoir.

Description

technical field [0001] The invention relates to a self-association type cross-linked polymer coil and a preparation method thereof, which belong to the technical field of petroleum exploitation. Background technique [0002] As one of the most important engineering plastics and textile fiber materials, polyamide has many excellent properties such as high strength and wear resistance. [0003] 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. [0004] Enhanced oil recovery technology involves many aspects, and the methods based on improving ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F220/06C08F226/02C08F4/40C09K8/588
Inventor 李先杰郑晓宇张健杨俊茹陈海玲吕鑫王秀军王剑
Owner CHINA NAT OFFSHORE OIL CORP
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