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Composite ionic polymer gel and preparation method thereof

A composite ion and polymer technology, applied in the field of composite ion polymer gel and its preparation, can solve the problems of insufficient plugging agent performance, achieve excellent plugging performance and stability, good technical and economic effects, and plugging strength high effect

Active Publication Date: 2019-04-26
CHINA NAT OFFSHORE OIL CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the deficiency of existing plugging agent self performance, develop a kind of composite ionic polymer gel and preparation method thereof

Method used

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  • Composite ionic polymer gel and preparation method thereof
  • Composite ionic polymer gel and preparation method thereof
  • Composite ionic polymer gel and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) prepare and inject simulated water according to the ion composition in Table 1 to obtain solvent water;

[0023] (2) Take by weighing 100g solvent water and 1.0g polyaluminum chloride (1.0% polyaluminum chloride);

[0024] (3) disperse polyaluminum chloride in solvent water, stir evenly, obtain polyaluminum chloride solution;

[0025] (4) Add 0.8% (0.8g) urea to the polyaluminum chloride solution, stir evenly to obtain a mixed solution;

[0026] (5) Weigh 3.4% (3.4g) acrylamide, 0.06% (0.06g) N,N-methylenebisacrylamide and 0.05% (0.05g) ammonium persulfate, mix well, and add it to the mixture , and stir evenly to obtain a gel system.

Embodiment 2

[0028] (1) prepare and inject simulated water according to the ion composition in Table 1 to obtain solvent water;

[0029] (2) Take a certain volume of solvent water and 2.0% polyaluminum chloride (with 100g water and 2.0g polyaluminum chloride in the example);

[0030] (3) disperse polyaluminum chloride in solvent water, stir evenly, obtain polyaluminum chloride solution;

[0031] (4) Add 1.0% (1.0g) urea into the polyaluminum chloride solution, stir evenly to obtain a mixed solution;

[0032] (5) Weigh 5.0% (10.0g) acrylamide, 0.3% (0.3g) ammonium persulfate and 0.3% (0.3g) N,N-methylenebisacrylamide, mix them evenly, and add them to the mixture , and stir evenly to obtain a gel system.

Embodiment 3

[0034] (1) prepare and inject simulated water according to the ion composition in Table 1 to obtain solvent water;

[0035] (2) Take a certain volume of solvent water and 3.0% polyaluminum chloride (with 100g water and 3.0g polyaluminum chloride in the example);

[0036] (3) disperse polyaluminum chloride in solvent water, stir evenly, obtain polyaluminum chloride solution;

[0037] (4) Add 1.5% (1.5g) urea into the polyaluminum chloride solution, stir evenly to obtain a mixed solution;

[0038] (5) Weigh 6.0% (6.0g) acrylamide, 0.4% (0.4g) ammonium persulfate and 0.4% (0.4g) N,N-methylenebisacrylamide, mix them evenly, and add them into the mixture , and stir evenly to obtain a gel system.

[0039] Table 1 Water Quality Analysis Form

[0040]

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Abstract

The invention relates to a composite ionic polymer gel and a preparation method thereof. The composite ionic polymer gel and the preparation method thereof are mainly used for blocking high-penetration strip belts or large pore paths in reservoirs in the oilfield development process. Components and quality percentage of a gel system is measured by water at 100%, 3.4%-6.0% of acrylamide, 1.0%-3.0%of polymeric aluminum, 0.06%-0.4% of N and N-methylene bisacrylamide, 0.05%-0.4% of ammonium persulfate and 0.8%-1.5% of urea are added. The gel system is injected into a stratum or a core, and waiting on cement setting is carried out for 1h-120h. A temperature range of a gel applicative oil reservoir is 25 DEG C-100 DEG C, and gel forming time can be adjusted between 1h and 120h. The initial viscosity of the composite ionic polymer gel is lower than 10mPa.s before gel forming, cross linking reaction can be generated in a reservoir rock pore, the formed gel has good blocking performance and stability, and is suitable for blocking the high-penetration strip belts or the large pore paths.

Description

technical field [0001] The invention relates to a composite ionic polymer gel and a preparation method thereof, which are mainly used for plugging high-permeability bands or large pores in reservoirs during oil field development. Background technique [0002] The vast majority of oilfields at home and abroad adopt the water flooding development method. At present, the major oilfields in China have entered the high water-cut or ultra-high water-cut development period. After long-term high-intensity water injection or polymer injection scour, the rock structure of some reservoirs is destroyed, causing the migration of rock cement and skeleton particles, and then forming high-permeability strips or large pores in the near-wellbore zone, which further intensifies the reservoir pressure. Due to the heterogeneity of the formation, the injected water or oil displacement agent will protrude along the large pores, forming an inefficient or ineffective circulation, and ultimately redu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/512
CPCC09K8/5045C09K8/5083C09K8/512
Inventor 刘义刚张云宝卢祥国孟祥海邹剑黎慧李彦阅王婷婷
Owner CHINA NAT OFFSHORE OIL CORP