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Method for preparing deep profile modification cationic polymer microlatex from reverse microemulsion

A polymer and cationic technology, which is applied in the cationic deep control polymer microlatex and its synthesis field, can solve the problems of difficult injectability, inefficiency, and limited development, and achieve the effect of strong adsorption performance

Inactive Publication Date: 2009-04-22
CHENGDU ORGANIC CHEM CO LTD CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the development of deep profile control agents is relatively mature, including weak gel (WG), colloidal dispersion gel (CDG) and pre-crosslinked particles, but their temperature resistance and salt resistance are not very good, and their flow size is relatively small. It can only seal the low-permeability layer, and has no effect on the high-permeability and water-scoured serious layer; in addition, pre-crosslinked particles limit their development due to their rapid swelling performance and difficult injection

Method used

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  • Method for preparing deep profile modification cationic polymer microlatex from reverse microemulsion
  • Method for preparing deep profile modification cationic polymer microlatex from reverse microemulsion
  • Method for preparing deep profile modification cationic polymer microlatex from reverse microemulsion

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Effect test

Embodiment 1

[0024] In the reaction vessel, add 80g of white oil and 40g of surfactant in a certain proportion, control the HLB value of the surfactant mixture between 9.2, control the temperature at 40°C, stir at 800rpm, and stir for 1.5h; according to the amount Acrylamide (monomer A) and trimethyl (acryloyloxyethyl) ammonium bromide (monomer B) were formulated into 15 g of aqueous solution, and the concentration of the solution was between 55 wt % (the molar ratio of A to B was 9:1 ). Then, under the condition of stirring again, the aqueous monomer solution was slowly added dropwise, and the stirring was continued for 5 hours, and the temperature of the solution was controlled between 40°C. Continue to stir, control the stirring speed between 300rpm, pass high-purity nitrogen for 30min, first add 0.03% aqueous solution of N,N-methylenebisacrylamide containing sodium acetate, and then add 0.05g of water-soluble free radical initiator V50, Continue to pass nitrogen to react for 5h, and o...

Embodiment 2

[0026] In the reaction vessel, add 80g of white oil and 40g of surfactant in a certain proportion, control the HLB value of the surfactant mixture between 8.8, control the temperature at 40°C, stir at 800rpm, and stir for 1.5h; according to the amount Acrylamide (monomer A) and trimethyl (acryloyloxyethyl) ammonium bromide (monomer B) were formulated into 20 g of aqueous solution, and the concentration of the solution was between 55 wt % (the molar ratio of A to B was 7:1 ). Then, under the condition of stirring again, the aqueous monomer solution was slowly added dropwise, and the stirring was continued for 5 hours, and the temperature of the solution was controlled between 40°C. Continue to stir, control the stirring speed between 300rpm, pass high-purity nitrogen for 30min, first add 0.03% aqueous solution of N,N-methylenebisacrylamide containing sodium acetate, and then add 0.15g of water-soluble free radical initiator V50, Continue to pass nitrogen to react for 5h, and o...

Embodiment 3

[0028] In the reaction vessel, add 80g of white oil and 40g of surfactant in a certain proportion, control the HLB value of the surfactant mixture between 8.8, control the temperature at 40°C, stir at 800rpm, and stir for 1.5h; according to the amount Acrylamide (monomer A) and trimethyl (acryloyloxyethyl) ammonium bromide (monomer B) were formulated into 20 g of aqueous solution, and the concentration of the solution was between 55 wt % (the molar ratio of A to B was 7:1 ). Then, under the condition of stirring again, the aqueous monomer solution was slowly added dropwise, and the stirring was continued for 5 hours, and the temperature of the solution was controlled between 40°C. Continue to stir, control the stirring speed between 300rpm, pass high-purity nitrogen for 30 minutes, first add 0.03% formaldehyde phenol aqueous solution containing sodium acetate, then add 0.1g of water-soluble free radical initiator V50, continue to pass nitrogen for 5 hours, and obtain transpare...

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Abstract

The invention relates to preparation of a cationic polymer and a micro emulsion for the cationic polymer. The cationic polymer is formed by copolymerization of a cationic monomer and a nonionic monomer, wherein an oil phase of the micro emulsion system is formed by mixing white oil, a span surfactant and a tween surfactant; and an aqueous phase of the micro emulsion system is an aqueous solution of a cationic monomer with surface activity and a nonionic monomer, and contains certain amount of sodium acetate. The polymer micro emulsion has the characteristics that the micro emulsion has low viscosity which is approximate to the viscosity of the oil phase, has obvious Tyndall effect, and can be subjected to emulsion breaking and dispersion quickly in water. The invention can be applied to industries of petroleum extraction and so on; and the polymer micro emulsion can be directly mixed with oil and injected into stratums, and emulsion breaking, expansion and transportation are performed according to the conditions of the stratums, so as to achieve the aim of deep flooding. The micro emulsion overcomes the defects that the prior deep flooding agent is difficult to inject, has low expanding multiplying power, is difficult to transport and so on.

Description

technical field [0001] The invention relates to a cationic deep control polymer microlatex and a synthesis method thereof, belonging to the field of water-soluble polymers. Background technique [0002] With the development of society, people's demand for energy is increasing, especially the demand for oil continues to expand. However, in the middle and late stages of oil production, that is, water flooding and polymer flooding, the formation with severe heterogeneity becomes more prominent, causing the injected water and polymer solution to advance unevenly along the high-permeability layer and the high-permeability layer area As a result, the sweep efficiency of the entire oil field is too low, and the oil displacement effect is poor, which seriously affects the development of water injection and polymer injection in the oil field. [0003] Deep control and flooding technology is an effective method to enhance oil recovery developed in the past ten years. It does not simp...

Claims

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Application Information

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IPC IPC(8): C08F220/56C08F2/32C09K8/588
Inventor 冯玉军鲁红升操卫平陈志
Owner CHENGDU ORGANIC CHEM CO LTD CHINESE ACAD OF SCI
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