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Method for preparing cross-linking polymer clew with bimodal distribution grain diameter

A cross-linked polymer, bimodal distribution technology, applied in the petroleum industry, can solve problems such as the inability to meet the requirements of different oil reservoirs, and achieve the effects of improving the effect of heterogeneity, improving oil recovery, and effective mechanical retention

Inactive Publication Date: 2008-08-13
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The water-soluble polymers obtained in the preparation methods reported in the prior art usually have small particle sizes and uniform particle sizes, which obviously cannot meet the requirements of different oil reservoirs, and the research seeks to adjust the shape of the water-soluble cross-linked polymer coils The method of particle size and particle size will have very practical value for improving and improving the displacement effect of early oilfields

Method used

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  • Method for preparing cross-linking polymer clew with bimodal distribution grain diameter
  • Method for preparing cross-linking polymer clew with bimodal distribution grain diameter
  • Method for preparing cross-linking polymer clew with bimodal distribution grain diameter

Examples

Experimental program
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Effect test

Embodiment 1

[0063] Prepare the oil phase: take by weighing 50 grams of base oil isoparaffin (Daqing Refining and Chemical Company) (viscosity 10.85cP), join in the 250 milliliters three-necked flasks with stirring, add 9.8 grams of sorbitan monooleate ( Span-80) and 2.2 grams of polyoxyethylene (20) sorbitan monostearate (20) ether (Tween-60) two non-ionic surfactants, after mixing evenly, add the azobisiso Heptanonitrile as oil phase;

[0064] Prepare the water phase: Weigh 18.8 grams of conventional water-soluble monomer acrylamide and 6.2 grams of sodium acrylate, and the functional water-soluble monomer N,N-diallyl-N,N, N, N-tetramethylhexammonium dichloride 0.75 g, salt anhydrous sodium acetate 1.00 g, chelating agent edetate disodium 0.75 mg, cosolvent urea 1.0 mg, oxidizing initiator ammonium persulfate 0.13 mg , the above ingredients are dissolved in 31.25 grams of ultrapure water (conductivity ≤ 4μS / cm) as the water phase for later use;

[0065] Start stirring, slowly add the a...

Embodiment 2

[0070] Prepare the same cross-linked polymer coil powder as in Example 1.

[0071] Cross-linked polymer coils with a mass fraction of 600mg / kg were matured in simulated island water at 60°C for 96 hours to obtain an aqueous solution of cross-linked polymer coils, with a gas permeability of 1.5 μm 2 The simulated oil displacement experiment of the isolated island was carried out on artificial cores, and it was measured that the simulated oil recovery could be increased by 17.0% under the experimental conditions.

Embodiment 3

[0073] Prepare the same cross-linked polymer coil powder as in Example 1.

[0074] Cross-linked polymer coils with a mass fraction of 300 mg / kg were aged in simulated island water at 60°C for 96 hours to obtain an aqueous solution of cross-linked polymer coils, with a gas permeability of 4.5 μm 2 The simulated oil displacement experiment of the isolated island was carried out on artificial cores, and it was measured that the simulated oil recovery could be increased by 14.0% under the experimental conditions.

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Abstract

The invention discloses a method for preparing linked polymer coil with particle size in bimodal distribution, comprises: dissolving surfactant oil-soluble initiator in base oil to produce oil phase; dissolving functional water-soluble monomer, normal water-soluble monomer in water to produce aqueous phase; mixing aqueous phase and oil phase to carry out emulsification, therefore stable suspended liquid of W / O type is obtained; initiating polymerization in such suspended liquid at a predetermined initiating temperature. The inventive method obtains linked polymer coil with particle size in bimodal distribution finally by controlling mass fraction of emulsifying agent between mass fraction needed for preparing microemulsion and emulsion. Advantages of the invention is that it is possible to regulate magnitude of two peaks and relative content of corresponding coil properly, to make the linked polymer coil more suitable for waterflooding reservoir with non-uniform porous media.

Description

technical field [0001] The invention relates to a preparation method of a chemical displacement agent capable of improving the heterogeneity of oil reservoirs and increasing the oil recovery rate of water injection development reservoirs. The prepared chemical displacement agent is a bimodal particle size distribution Cross-linked polymer coils. The invention belongs to the field of petroleum industry. 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 asp...

Claims

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Application Information

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IPC IPC(8): C08F2/32C08F220/56C09K8/64
Inventor 郑晓宇陈海玲肖建宏马玉华
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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