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Pressure-reducing and injection-increasing agent for water injection well of low-permeability oilfield, and preparation method and application thereof

A technology for oilfield water injection and booster injection, which is applied to chemical instruments and methods, earthwork drilling and production, wellbore/well components, etc. It can solve the problems of poor repeated acidizing effect, declining oil production, small water injection, etc., and achieve improvement Effects of effective permeability, expanding pore radius, and reducing water injection pressure

Inactive Publication Date: 2016-11-09
郑州东申石化科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the late stage of low-permeability reservoir development, the water injection pressure is high, the water injection volume is small, and the injection-production imbalance results in large seepage resistance
Therefore, the water injection pressure often rises rapidly, the water injection volume drops rapidly, or even no water can be injected, resulting in a rapid decline in oil production.
[0003] At present, strong acid is commonly used to treat water injection wells, which is effective quickly, but the effect is poor for reservoirs with low permeability, and it will cause secondary pollution to the formation, and the effect of repeated acidification is getting worse and worse, and the overall construction cost is high.
[0004] The applicant's initial research found that if only the combination of nonionic surfactants, anionic surfactants and amphoteric surfactants is used, although the tension on the surface of formation rocks can be reduced in a short period of time, the surface wetting can be improved in practical applications. Wetness is very limited, and it is not resistant to erosion, and the effect of reducing pressure and increasing injection has certain limitations

Method used

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  • Pressure-reducing and injection-increasing agent for water injection well of low-permeability oilfield, and preparation method and application thereof
  • Pressure-reducing and injection-increasing agent for water injection well of low-permeability oilfield, and preparation method and application thereof
  • Pressure-reducing and injection-increasing agent for water injection well of low-permeability oilfield, and preparation method and application thereof

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Effect test

Embodiment 1

[0036] The multifunctional surface treatment agent of the present embodiment: nonionic surfactant (fatty alcohol polyoxyethylene ether AEO-9) 45%, anionic surfactant (sodium α-alkenyl sulfonate) 20%, amphoteric surfactant ( Cocamidopropyl Betaine) 35%;

[0037] The pH regulator in this embodiment is 10% by mass aqueous sodium hydroxide solution.

[0038] The preparation method is as follows: firstly add 30g of compounded multi-functional surfactant into a 1000mL flask, add 400mL of deionized water and stir evenly, then raise the temperature to 60°C, and stir at constant temperature for 60 minutes, at this time the solution turns from turbid state to clear ;

[0039] When the temperature drops below 40°C, add 10g of hydrophobic nano-silica or hydrophobic nano-polysilicon, and 25g of pH regulator to control the pH value between 10, and finally add 200mL of deionized water and stir evenly, then slowly heat up, wait When the temperature reaches 80°C, continue to stir for 1 hour ...

Embodiment 2

[0042] The multifunctional surface treatment agent of the present embodiment: nonionic surfactant (polyoxyethylene sorbitan fatty acid ester) 30%, anionic surfactant (sodium dodecylbenzenesulfonate) 25%, amphoteric surfactant (Myristamidopropyl Hydroxypropyl Sultaine) 45%;

[0043] The pH regulator of the present embodiment is 5% sodium carbonate aqueous solution in mass percent.

[0044] The preparation method is: first add 15g of compounded multi-functional surfactant into a 1000mL flask, add 400mL of deionized water and stir evenly, then raise the temperature to 80°C, and stir at constant temperature for 60 minutes, at this time the solution turns from turbid to clear ;

[0045] When the temperature drops below 40°C, add 20g of hydrophobic nano-silica or hydrophobic nano-polysilicon, and 35g of pH regulator to control the pH value between 13. Finally, add 200mL of deionized water and stir evenly, then slowly heat up. When the temperature reaches 100°C, continue to stir fo...

Embodiment 3

[0047] The multifunctional surface treatment agent of the present embodiment: nonionic surfactant (fatty alcohol polyoxyethylene ether) 80%, anionic surfactant (1:1 α-alkenyl sodium sulfonate and sodium dodecylsulfonate ) 5%, amphoteric surfactant (1:1 cocamidopropyl betaine and myristamidopropyl hydroxypropyl sultaine) 15%;

[0048] The pH regulator of the present embodiment is 15% sodium carbonate aqueous solution in mass percent.

[0049] The preparation method is as follows: first add 40g of compounded multi-functional surfactant into a 1000mL flask, add 400mL of deionized water and stir evenly, then raise the temperature to 40°C, and stir at constant temperature for 60 minutes, at this time the solution turns from turbid to clear ;

[0050]When the temperature drops below 40°C, add 5g of hydrophobic nano-silica or hydrophobic nano-polysilicon, 20g of pH regulator, and control the pH value between 8. Finally, add 200mL of deionized water and stir evenly, then slowly heat ...

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Abstract

The invention relates to a pressure-reducing and injection-increasing agent for a water injection well of a low-permeability oilfield, and a preparation method and application thereof. The pressure-reducing and injection-increasing agent is prepared from the following components by weight: 2.0 to 6.5% of a multifunctional surface treating agent, 0.75 to 3.15% of hydrophobic nanometer silica or nanometer poly-silicon and 2 to 8% of a pH conditioning agent, with the balance being deionized water, wherein the multifunctional surface treating agent comprises, by weight, 30 to 80% of a nonionic surfactant, 2 to 25% of an anionic surfactant and 10 to 50% of an ampholytic surfactant. The pressure-reducing and injection-increasing agent is free of pollution to strata and can overcome the problems of high water injection pressure, unqualified injection allocation of a water injection rate and a short action period of injection increase in the later stage of development. The preparation method is simple in process, free of emission of pollutants and easy for industrial large-scale production.

Description

technical field [0001] The invention belongs to the technical field of oilfield chemistry, and in particular relates to a pressure-reducing and increasing injection agent specially used for water injection wells with enhanced recovery in low-permeability oilfields and its preparation and application. Background technique [0002] In the late development stage of low permeability reservoirs, the water injection pressure is high, the water injection volume is small, and the injection-production imbalance results in high seepage resistance. Therefore, the water injection pressure rises rapidly, the water injection volume drops rapidly, or even no water can be injected, resulting in a rapid decline in oil production. [0003] At present, strong acid is commonly used to treat water injection wells, which has a quick effect, but the effect is poor for reservoirs with low permeability, and it will cause secondary pollution to the formation, and the effect of repeated acidification ...

Claims

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Application Information

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IPC IPC(8): C09K8/584E21B43/22
CPCC09K8/584E21B43/16
Inventor 吴慧敏
Owner 郑州东申石化科技有限公司
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