Preparation method and application of gel profile control oil-displacing agent

A profile control oil displacement agent and gel technology, applied in the field of oil displacement agents, can solve the problems of weak profile control oil displacement strength, too fast cross-linking speed, high temperature and high salt resistance, etc., so as to improve the sweep volume and solid particles. Strong ability and the effect of saving investment

Inactive Publication Date: 2014-05-07
盘锦万通科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a preparation method and application of a gel profile control and oil displacement agent, aiming to so

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Take 10g of cationic monomer, 20g of nonionic monomer, 0.1g of methylenebisacrylamide, 0.2g of ammonium persulfate and 69.7g of water to form a solution, and polymerize for 11 hours at a temperature of 90°C to obtain a gel conditioner. Displacing oil agent 1. Electron microscope observation shows that the particle size of the gel profile control and oil displacement agent 1 is 2-30 μm.

Embodiment 2

[0020] Take 50g of cationic monomer, 5g of nonionic monomer, 0.01g of methylenebisacrylamide, 0.1g of ammonium persulfate and 44.99g of water to prepare a solution, and polymerize at 60°C for 8 hours to obtain a gel-modified Displacing oil displacing agent 2. Electron microscope observation shows that the particle size of the gel profile control and oil displacement agent 2 is 2-30 μm.

Embodiment 3

[0022] Take 20g of cationic monomer, 10g of nonionic monomer, 0.05g of methylene bisacrylamide, 0.15g of ammonium persulfate and 69.8g of water to prepare a solution, and polymerize at 80°C for 10 hours to obtain a gel-modified Displacing oil agent 3. Electron microscope observation shows that the particle size of the gel profile control and oil displacement agent 3 is 2-30 μm.

[0023] Compared with the disadvantages and deficiencies of the prior art, the present invention has the following beneficial effects:

[0024] (1) The preparation method of the gel profile control oil displacement agent of the present invention is simple, and the product source is abundant and easy to obtain.

[0025] (2) The gel profile control and oil displacement agent of the present invention has a small particle size, and can enter rock formation cracks with water as a carrying medium, without special injection equipment, modification of water injection pipelines, or construction of special inje...

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PUM

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Abstract

The invention provides a preparation method and an application of a gel profile control oil-displacing agent. The preparation method comprises the following steps: mixing the following components by mass percent: 10% to 50% of cationic monomer, 5% to 20% of nonionic monomer, 0.01% to 0.1% of methylene bisacrylamide, 0.1% to 0.2% of ammonium persulfate and the balance of water, so as to prepare a solution; performing a polymerization reaction on the solution for 8 to 11 hours at the temperature of 60 DEG C to 90 DEG C so as to obtain the gel profile control oil-displacing agent. The preparation method is simple; the required synthetic materials are abundant in resource and easy to obtain. In addition, the prepared gel profile control oil-displacing agent has the advantages that the oil-displacing agent is small in particle diameter and can be split from sand grains and condensed with the sand grains to form gel groups under different pressure differences; the oil-displacing agent is more excellent in heat resistance and salt tolerance because an oil-displacing activator is fixed on the surface of each microsphere, and the like. Thus, the gel profile control oil-displacing agent can be favorably applied to the blocking and the oil displacement of rock layer cracks during the exploitation of oilfields of various types, and is low in cost and good in effect.

Description

technical field [0001] The invention belongs to the field of oil displacement agents, in particular to a preparation method and application of a gel profile control oil displacement agent. Background technique [0002] The oilfield recovery rate is determined by the efficiency of the injected fluid, which is reflected in the swept volume and oil washing efficiency. The complexity of the formation (such as heterogeneity) and the large flow channel formed by long-term water injection lead to a small swept volume of injected water, The recovery rate is low. In the high water-cut and ultra-high water-cut periods in the later stage of production, a large amount of injected water flows in series, and the middle and low permeability layers are not swept, and there is still a large amount of residual oil. At this time, the full profile control changes the seepage direction of the injected water and increases the swept volume of the injected water. It is an important method to impro...

Claims

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Application Information

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IPC IPC(8): C09K8/508C09K8/588
CPCC09K8/512C09K8/5083C09K8/588
Inventor 朱志勇赵善为田继民李彦李宏旭孙延柱刘唯玉李韫丞崔浩魏操祝景涛
Owner 盘锦万通科技有限公司
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