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

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

Example Embodiment

[0067] Example 1 Preparation of amphoteric crosslinked polymer coil

[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 15 grams of ultrapure water (conductivity≤4μS / cm) at 10℃ Ammonium chloride, 0.56 g N,N'-diallyl-N,N,N',N'-tetramethylhexamethylene diammonium chloride, 0.63 mg chelating agent disodium edetate and 0.5 mg cosolvent Urea, stir evenly, adjust the pH of the solution to 4.0-5.0 with 35% sodium hydroxide to obtain an aqueous solution with polymerized monomers 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 introduction tube, a thermometer and a constant speed stirrer, stir and mix well Obtain a white oil solution with dispersant.

[0070] At 5°C and a stirring speed of 1000 revolutions per minute, slowly add the resulting aqueous solution with polymeri...

Example Embodiment

[0072] Example 2 Determination of salt tolerance of amphoteric crosslinked polymer coil

[0073] The amphoteric cross-linked polymer coil powder prepared in Example 1 with a mass fraction of 300 mg / kg was cured in simulated water with a mass fraction of sodium chloride of 4500 mg / kg, 8000 mg / kg, and 15000 mg / kg at room temperature for 0 days, 1 day, 2 days, 3 days, 4 days, the amphoteric cross-linked polymer coil aqueous solution was obtained. The low-pressure difference microporous membrane method was used to determine the blocking condition of the amphoteric cross-linked polymer coil aqueous solution. See the experimental device 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 a bolt on the lower flange 6 Connection 7.

[0074] The experimental operation steps are as follows:

[0075] (1) Soak the mixed cellul...

Example Embodiment

[0078] Example 3. Profile control performance of amphoteric cross-linked polymer coil

[0079] The water swellable amphoteric crosslinked polymer coil (SS 20 ) The powder is matured in simulated water of SZ36-1 oilfield at 65℃ for 48 hours, and formulated into an aqueous solution of amphoteric cross-linked polymer coil with a mass fraction of 400 mg / kg, and the obtained amphoteric cross-linked polymer coil aqueous solution is used to measure the gas permeability 2.0μm 2 The single-tube man-made core was used in the displacement experiment of the simulated oil in the Bohai SZ36-1 oilfield. It was measured that the aqueous solution of the amphoteric cross-linked polymer coil 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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