Low-tension polymer microsphere profile control and flooding agent, and preparation method and application thereof

A technology of polymer and flood control agent, applied in the direction of drilling composition, chemical instruments and methods, etc., can solve the problems of low solid content, low content, poor stability of products, etc., and achieve enhanced oil recovery, content Low, good recombination effect

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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] One of the technical problems to be solved by the present invention is that in the prior art, the amount of emulsifier of the polymer microsphere emulsion prepared by the existing inverse microemulsion method is high, and the solid content of the product prepared by the ordinary inverse emulsion method is low and the stability is not good. Well, the problem of compatibility with various surfactants for oil displacement; provide a low-tension polymer microsphere control and displacement agent, which is composed of sub-micron polymer microspheres with high solid content and good stability The spherical emulsion is prepared by mixing and compounding surfactants for oil displacement; due to the low content of traditional small-molecule emulsifiers in the polymer microsphere system, it has good compatibility with various surfactants for oil displacement, and various performance evaluations show that , can be used as an integrated low-tension polymer microsphere control and displacement agent, especially suitable for high-temperature and high-salt reservoirs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Add 700g of white oil, 40g of SPAN80, 30g of oligoethylene oxide methacrylate polymer emulsifier, 6g of AEO9 into a 3L large beaker, and stir until completely mixed; add 600g of water and 650g of propylene into another container Amide, 150g 2-acrylamido-2-methylpropanesulfonate sodium, 20g sodium acetate, 0.8g disodium edetate, 5g isopropanol, 8g urea, 2.5g methylenebisacrylamide, stirring Dissolve evenly and use it as the water phase; in addition, prepare 2% ammonium persulfate and 0.05% sodium bisulfite aqueous solutions respectively for later use. Turn on the emulsifier at 10,000 rpm, add all the water phase to the large beaker storing the oil phase, shear and stir for 30 minutes until the emulsification is uniform, then add the reaction emulsion into the polymerization kettle, control the temperature in the kettle to 12°C, and the stirring speed to 500rpm . After passing nitrogen for 30 minutes, first add 3 ml of oxidant aqueous solution, then drop in reducing agen...

Embodiment 2

[0047] Add 680g of white oil, 38g of SPAN60, 32g of styrene-maleic anhydride copolymer polymer emulsifier, 5g of AEO9 into a 3L beaker, and stir until completely mixed; add 620g of water, 630g of acrylamide, 180g 2-acrylamido-2-methylpropanesulfonate sodium, 110g DMC (80%wt content), 22g sodium acetate, 0.5g disodium edetate, 15g isopropanol, 8g urea, methylene bis 1.5 g of acrylamide was stirred and dissolved evenly as the water phase; in addition, 2% ammonium persulfate and 0.06% sodium bisulfite aqueous solutions were prepared separately for later use. Turn on the emulsifier at 10,000 rpm, add all the water phase to the large beaker storing the oil phase, shear and stir for 25 minutes until the emulsification is uniform, then add the reaction emulsion into the polymerization kettle, control the temperature in the kettle to 15°C, and the stirring speed to 500rpm . After passing nitrogen for 30 minutes, first add 4 ml of oxidizing agent aqueous solution, then drop in reducin...

Embodiment 3

[0050] Add 700g of white oil, 40g of SPAN83, 30g of polyisobutylene succinic anhydride ester polymer emulsifier, 8g of AEO15 into a 3L beaker, and stir until completely mixed; add 400g of water, 700g of acrylamide, 100g of 2 -Sodium acrylamido-2-methylpropanesulfonate, 250g DMC (80%wt content), 30g sodium acetate, 0.5g disodium edetate, 20g isopropanol, 10g urea, methylenebisacrylamide 2.0 g, stirred and dissolved evenly as the water phase; in addition, 2% ammonium persulfate and 0.05% sodium bisulfite aqueous solutions were prepared separately for later use. Turn on the emulsifier at 10,000 rpm, add all the water phase to the large beaker storing the oil phase, shear and stir for 30 minutes until the emulsification is uniform, then add the reaction emulsion into the polymerization kettle, control the temperature in the kettle to 16°C, and the stirring speed to 500rpm . After passing nitrogen for 30 minutes, first add 3.8 ml of oxidant aqueous solution, then drop in reducing ...

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Abstract

The invention relates to a low-tension polymer microsphere profile control and flooding agent, and a preparation method and an application thereof and mainly solves the problems that polymer microspheres and oil displacement surfactants are poor in compatibility with an oil displacement surfactant and slug injection is necessary in the prior art. The low-tension polymer microsphere profile controland flooding agent includes, by weight, 0.05-0.5 parts of a polymer microsphere emulsion, 0.1-1 parts of the oil displacement surfactant, and 0-99.85 parts of water. The profile control and floodingagent has high effective solid content, good stability, and ultralow oil-water interface tension. The polymer microspheres have effect of deep profile control while the surfactant has the effect of oil displacement, so that the product has both profile control and flooding functions. The profile control and flooding agent has convenience in site operation and can be used for site application, suchas deep profile control, water plugging and oil displacement, of tertiary oil recovery of high-temperature and high-salt oil fields for increasing recovery efficiency.

Description

technical field [0001] The invention relates to a low-tension polymer microsphere control and displacement agent suitable for high-temperature and high-salt oil reservoirs and a preparation method thereof. Background technique [0002] With the improvement of the degree of exploitation, water production from oil wells is a common problem in the current oilfield development. Especially in the old oilfields developed by long-term water injection, due to the heterogeneity of the reservoir and the difference in the viscosity of oil and water, the injected water along the water injection well The high-permeability layer or fracture between the well and the production well breaks out and fingers, resulting in premature water flooding of the production well, a decrease in oil production, and an increase in water cut. To reduce the water output of oil wells, it is usually necessary to block high-permeability layers or fractures from water injection wells, adjust the water absorption...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F220/58C08F222/38C08F2/30C09K8/588C09K8/584
CPCC08F2/30C08F220/56C09K8/584C09K8/588C08F220/585C08F222/385
Inventor 夏燕敏苏智青许汇王兰
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