Plugging agent suitable for water shut-off and profile control of low-temperature high-salinity oil reservoir

A technology for water plugging, profile control and plugging agent, which is applied to drilling compositions, chemical instruments and methods, etc., can solve the problems of unsuitable low-temperature oil reservoirs, unusable low-temperature oil reservoirs, poor gel formation effect, etc. The freezing time is controllable, the freezing intensity is adjustable, and the effect of improving the sweep coefficient

Inactive Publication Date: 2017-07-04
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the jelly cannot be gelled under low temperature conditions, so it cannot be used in low temperature oil reservoirs
The Chinese application whose publication number is CN104194754A provides a kind of heat-resistant and salt-resistant HPAM / Cr 3+ / Phenolic composite cross-linked weak gel profile control and water shutoff agent and its preparation method, the gel can form a higher strength gel in the temperature range of 60-90°C, has good stability, and can form effective plugging for formations, And the effect of salt resistance is good, but the jelly has poor gelation effect or even no gelation at low temperature (below 60°C), so it is not suitable for low temperature oil reservoirs

Method used

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  • Plugging agent suitable for water shut-off and profile control of low-temperature high-salinity oil reservoir
  • Plugging agent suitable for water shut-off and profile control of low-temperature high-salinity oil reservoir
  • Plugging agent suitable for water shut-off and profile control of low-temperature high-salinity oil reservoir

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A plugging agent suitable for water shutoff and profile control in low-temperature and high-salt reservoirs, composed of: 5.00% acrylamide, 0.50% N,N-methylenebisacrylamide, 0.40% ammonium persulfate, ferricyanide Sodium 0.10% and Water 94.00%. The mass of each component is:

[0031] Acrylamide 5.00g;

[0032] N,N-methylenebisacrylamide 0.50g;

[0033] Ammonium persulfate 0.40g;

[0034] Sodium ferricyanide 0.10g;

[0035] Water 94.00g.

[0036] Its preparation method is as follows:

[0037] (1) Take 94.00g of water, add 5.00g of acrylamide into the water while stirring, and keep stirring for 1-2 hours to obtain an acrylamide solution;

[0038] (2), then slowly add 0.50 g of N,N-methylenebisacrylamide, 0.40 g of ammonium persulfate and 0.10 g of sodium ferricyanide while stirring, and continue stirring for 0.5 h to obtain a blocking agent gel;

[0039] (3), the blocking agent gelling solution is placed in a plurality of ampoules, after being sintered and sealed w...

Embodiment 2

[0045] A plugging agent suitable for water shutoff and profile control in low-temperature and high-salt reservoirs. The mass percent composition is: acrylamide 6.00%, N,N-methylenebisacrylamide 0.60%, ammonium persulfate 0.50%, ferricyanide Sodium 0.08% and Water 92.82%. The mass of each component is:

[0046] Acrylamide 6.00g;

[0047] N,N-methylenebisacrylamide 0.60g;

[0048]Ammonium persulfate 0.50g;

[0049] Sodium ferricyanide 0.08g;

[0050] Water 92.82g.

[0051] Its preparation method is as follows:

[0052] (1) Take 92.82g of water, add 6.00g of acrylamide into the water while stirring, and keep stirring for 1-2 hours to obtain an acrylamide solution;

[0053] (2), then slowly add 0.60g of N,N-methylenebisacrylamide, 0.50g of ammonium persulfate and 0.08g of sodium ferricyanide while stirring, and continue stirring for 0.5h to obtain a blocking agent gel;

[0054] (3), the blocking agent gelling solution is placed in a plurality of ampoules, after being sinter...

Embodiment 3

[0060] A plugging agent suitable for water shutoff and profile control in low-temperature and high-salt reservoirs. The mass percent composition is: acrylamide 7.00%, N,N-methylenebisacrylamide 0.70%, ammonium persulfate 0.60%, ferricyanide Sodium 0.06% and Water 91.64%. The mass of each component is:

[0061] Acrylamide 7.00g;

[0062] N,N-methylenebisacrylamide 0.70g;

[0063] Ammonium persulfate 0.60g;

[0064] Sodium ferricyanide 0.06g;

[0065] Water 91.64g.

[0066] Its preparation method is as follows:

[0067] (1) Take 91.64g of water, add 7.00g of acrylamide into the water while stirring, and keep stirring for 1-2 hours to obtain an acrylamide solution;

[0068] (2), then slowly add 0.70g of N,N-methylenebisacrylamide, 0.60g of ammonium persulfate and 0.06g of sodium ferricyanide while stirring, and continue stirring for 0.5h to obtain a blocking agent gel;

[0069] (3), the blocking agent gelling solution is placed in a plurality of ampoules, after being sinte...

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Abstract

The invention provides a plugging agent suitable for water shut-off and profile control of a low-temperature high-salinity oil reservoir; the plugging agent contains the components by the mass concentration: 5.00-7.00% of acrylamide, 0.50-0.70% of N,N-methylene bisacrylamide, 0.40-0.60% of ammonium persulfate, 0.06-0.10% of sodium ferricyanide, and the balance water. The plugging agent for the low-temperature high-salinity oil reservoir can be applicable to water plugging and profile control construction of the low-temperature high-salinity oil reservoir, and the recovery efficiency is enhanced. The gel plugging agent provided by the invention has the gel forming time controllable in 18-62 hours under low-temperature high-salinity conditions, the strength of formed gel is adjustable in E-I levels, and a high-strength gel without flowing can be formed at low temperature; and the plugging agent has the advantages of good stability and high plugging strength under a high salinity condition, can form effective plugging on high-permeability stratums or dominant channels, and has a significant effect for improving the recovery efficiency.

Description

technical field [0001] The invention belongs to the technical field of chemical products used in oil fields, and in particular relates to a plugging agent suitable for water plugging and profile control in low-temperature and high-salt oil reservoirs. [0002] technical background [0003] At present, most oilfields in my country are developed by water flooding. As the oilfields enter the middle and post-development stages, formation heterogeneity intensifies, and many oilfields enter a high water cut period. Oil wells are severely watered or even flooded, seriously affecting oilfield production. Therefore, water control, stable oil production and enhanced oil recovery have become the main challenges facing my country's oilfields. [0004] Among the many water control and oil stabilization measures, chemical water control is the most valued due to its simple construction measures and good selectivity. Among them, polymer jelly plugging agent is the most popular due to its low...

Claims

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Application Information

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IPC IPC(8): C08F220/56C08F222/38C09K8/512
CPCC09K8/512C09K8/887C08F220/56C08F222/385
Inventor 戴彩丽刘逸飞陈昂由庆赵明伟孙永鹏吴一宁赵光高明伟方吉超
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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