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Amphoteric crosslinked polymer coil and preparation method thereof

A cross-linked polymer and amphoteric technology, which is applied in drilling compositions, chemical instruments and methods, earth square drilling and production, etc., can solve the problems that are difficult to meet the requirements, achieve good salt resistance, and improve oil recovery Effect

Active Publication Date: 2017-03-01
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Cross-linked polymer coils in the prior art are often difficult to meet this requirement

Method used

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  • Amphoteric crosslinked polymer coil and preparation method thereof
  • Amphoteric crosslinked polymer coil and preparation method thereof
  • Amphoteric crosslinked polymer coil and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] Embodiment 1 Preparation of amphoteric cross-linked polymer coils

[0068] Add 5.45 grams of 2-acrylamide-2-methylpropanesulfonic acid, 14.67 grams of acrylamide, and 6.24 grams of acryloyloxyethyl trimethyl chloride to 10°C and 15 grams of ultrapure water (conductivity ≤ 4 μS / cm). Ammonium chloride, 0.56 g of N,N'-diallyl-N,N,N',N'-tetramethylhexammonium chloride, 0.63 mg of chelating agent disodium edetate and 0.5 mg of co-solvent Urea, stir evenly, adjust the pH value of the solution with 35% sodium hydroxide to 4.0 to 5.0, and obtain an aqueous phase solution in which polymerized monomers are dissolved;

[0069] Add 3.12 grams of sorbitan trioleate, 2.88 grams of sorbitan monooleate and 39.02 grams of 3# white oil into a jacketed reactor equipped with a gas inlet tube, a thermometer and a constant speed stirrer, stir and mix well A white oil solution with dispersant was obtained.

[0070] At 5°C, with a stirring speed of 1000 rpm, slowly add the obtained aqueous p...

Embodiment 2

[0072] Embodiment 2 Determination of amphoteric cross-linked polymer coil salt resistance

[0073] The amphoteric crosslinked polymer coil powder prepared in Example 1 with a mass fraction of 300 mg / kg was matured at room temperature for 0 days, 1 day, 2 days, 3 days, 4 days, the aqueous solution of amphoteric crosslinked polymer coils was obtained. The method of low-pressure differential microporous membrane was used to measure the plugging of amphoteric cross-linked polymer coil aqueous solution. Experimental device see figure 1 , the device includes a nitrogen cylinder 1, a pressure reducing valve 2, a pressure gauge 3, a cylinder body 4, a flange 5, a valve 8 and a measuring cylinder 9, wherein the flange 5 includes a lower flange 6, and the lower flange 6 has bolts Connection 7.

[0074] The experimental operation steps are as follows:

[0075] (1) Soak the mixed cellulose ester hot press filter membrane with deionized water for 3 days;

[0076] (2) Place the micropo...

Embodiment 3

[0078] Embodiment 3, the profile control property of amphoteric cross-linked polymer coil

[0079] Gained water-swellable amphoteric cross-linked polymer coil (SS 20 ) powder was matured in simulated water of SZ36-1 oilfield at 65°C for 48 hours, and prepared into an aqueous solution of amphoteric cross-linked polymer coils with a mass fraction of 400 mg / kg. 2.0μm 2 The single-tube artificial core was used to carry out the displacement experiment of simulated oil in Bohai SZ36-1 oilfield, and it was measured that the amphoteric cross-linked polymer coil aqueous solution obtained under the experimental conditions increased the simulated oil recovery by 18.6%.

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Abstract

The invention relates to an amphoteric crosslinked polymer coil and a preparation method thereof. The method comprises the following steps: dissolving anionic monomer, cationic monomer, nonionic monomer and cross-linking monomer in water according to the mole ratios of them being 2.5-25:2.5-25:50-95:0.1-6 to prepare a water phase with the total mass fraction of 2.0%-60%, dissolving a dispersing agent in a base oil to prepare an oil phase with the content of 1.0%-50.0%; mixing the two phases to obtain a suspension dispersion, wherein the total mass fraction of the anionic monomer, cationic monomer and nonionic monomer in the dispersion are controlled to be 10.0%-40.0%, the mass fraction of the cross-linking monomer is 0.001%-2.0%, and the mass fraction of the dispersing agent is 1.0%-15.0%; in the inert environment, carrying out polymerization reaction to obtain the amphoteric crosslinked polymer coil. The amphoteric crosslinked polymer coil is particularly suitable for higher permeability oil reservoirs or medium and low permeability oil reservoirs with relatively high permeability strips and the recovery rate of crude oil can be improved.

Description

technical field [0001] The invention relates to a cross-linked polymer coil (microsphere) and a preparation method thereof, in particular to an amphoteric cross-linked polymer coil and a preparation method thereof, belonging to the field of petroleum industry. Background technique [0002] At present, the early development of oil fields has entered the middle and late stages of water flooding oil recovery. How to further increase the volumetric sweep coefficient and swept volume of injected water and economically and effectively exploit existing oil fields is one of the major issues to be solved in the petroleum industry. Among them, the enhanced oil recovery technology Development and application played an important role. The enhanced oil recovery technology based on improving the displacement effect can be divided into improving the volumetric sweep coefficient of the injected fluid and improving the oil washing efficiency in the swept volume. [0003] With the deepening ...

Claims

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Application Information

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IPC IPC(8): C08F220/56C08F220/58C08F220/34C08F4/40C08F2/32C09K8/508C09K8/588E21B43/22
Inventor 李先杰张健郑晓宇李强杨俊茹陈海玲王剑赵娟
Owner CHINA NAT OFFSHORE OIL CORP
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