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Low-permeability oil reservoir water injection well decompression and augmented injection agent and preparation method thereof

A water injection well, low permeability technology, applied in chemical instruments and methods, drilling composition, etc., can solve the problems of reduced interfacial tension, unfavorable film-like adhesion oil removal, easy formation of fingering, etc., to improve rock wetness. Wet, reduce water injection friction and capillary resistance, good effect

Active Publication Date: 2019-06-21
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] To sum up, the currently disclosed patents are mainly aimed at reducing the interfacial tension of oil and water. After the interfacial tension of oil and water is reduced, the capillary resistance is reduced, and the oil droplets blocked in the pore roar can be easily removed. The oil film has no special effect. On the other hand, due to the reduction of interfacial tension, it is easy to form fingering, which is not conducive to the removal of film-like adhesive oil.

Method used

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  • Low-permeability oil reservoir water injection well decompression and augmented injection agent and preparation method thereof
  • Low-permeability oil reservoir water injection well decompression and augmented injection agent and preparation method thereof
  • Low-permeability oil reservoir water injection well decompression and augmented injection agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Embodiment 1 A kind of pressure-reducing and injection-increasing agent for water injection wells in low-permeability reservoirs

[0035] The ingredients and their parts by weight are: 50 parts of dehydrorosin-type surfactant, 4 parts of dodecyl dimethyl hydroxypropyl phosphate betaine, 5 parts of cocamidopropyl betaine, polyoxyethylene quaternary Add 18 parts of ammonium salt, 5 parts of cetyl alcohol, and ethanol to 100 parts;

[0036] Described dehydroabietic surfactant structural formula is:

[0037]

[0038] In formula Ⅰ, R 1 and R 2 is a methyl group, R 3 For dodecyl.

[0039] The preparation method of described dehydroabietic type surfactant is, carries out as follows:

[0040] (1) Dissolve dehydroabietamine in absolute ethanol with 1.8 times its weight, slowly add dodecane bromide, and then reflux at 85°C for 24 hours;

[0041] (2) Cool down to 30°C, add iodomethane and stir in the dark for 12 hours, remove ethanol and unreacted alkanes by rotary evaporat...

Embodiment 2

[0047] Example 2 A depressurization and injection enhancement agent for water injection wells in low-permeability reservoirs

[0048] The ingredients and their parts by weight are: 52 parts of dehydrorosin-type surfactant, 3 parts of dodecyl dimethyl hydroxypropyl phosphate betaine, 4 parts of cocamidopropyl betaine, polyoxyethylene quaternary Add 22 parts of ammonium salt, 8 parts of cetyl alcohol, and ethanol to 100 parts;

[0049] Described dehydroabietic surfactant structural formula is:

[0050]

[0051] In formula Ⅰ, R 1 and R 2 is a methyl group, R 3 For octane.

[0052] The preparation method of described dehydroabietic type surfactant is, carry out in steps as follows:

[0053] (1) Dissolve dehydroabietamine in absolute ethanol 1.5 times its weight, slowly add bromooctane, and then reflux at 80°C for 26 hours;

[0054] (2) Cool down to 35°C, add iodomethane and stir in the dark for 10 hours, remove ethanol and unreacted alkanes by rotary evaporation, and obta...

Embodiment 3

[0060] Embodiment 3 A kind of pressure-reducing and injection-increasing agent for water injection wells in low-permeability reservoirs

[0061] The ingredients and their parts by weight are: 55 parts of dehydrorosin-type surfactant, 5 parts of dodecyl dimethyl hydroxypropyl phosphate betaine, 6 parts of cocamidopropyl betaine, polyoxyethylene quaternary Add 18 parts of ammonium salt, 8 parts of cetyl alcohol, and ethanol to 100 parts;

[0062] Described dehydroabietic surfactant structural formula is:

[0063]

[0064] In formula Ⅰ, R 1 and R 2 is a methyl group, R 3 For hexadecyl.

[0065] The preparation method of described dehydroabietic type surfactant is, carry out in steps as follows:

[0066] (1) Dissolve dehydroabietamine in absolute ethanol 2.0 times its weight, slowly add hexadecane bromide, and then reflux at 90°C for 20 hours;

[0067] (2) Cool down to 25°C, add iodomethane and stir in the dark for 15 hours, remove ethanol and unreacted alkanes by rotary ...

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Abstract

The invention belongs to the technical field of oilfield water injection development, and particularly relates to a low-permeability oil reservoir water injection well decompression and augmented injection agent and a preparation method thereof, wherein 100 parts of the decompression and augmented injection comprise, by weight, 50-55 parts of a dehydrogenated rosin type surfactant, 7-11 parts of abetaine type amphoteric surfactant, 18-22 parts of a cationic surfactant, 5-8 parts of cetyl alcohol, and the balance of ethanol. According to the present invention, the decompression and augmented injection agent can remove the oil films, wherein the cation component forms a molecular film on the rock surface by using water as a transmission medium so as to stabilize clay, improve the wettability of the rock surface, and reduce the water injection friction and the capillary resistance, such that the water injection pressure is reduced, the water injection capacity of the low-permeability oil reservoir is improved, and the water flooding efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of water injection development in oilfields, and in particular relates to a pressure-reducing and injection-increasing agent for water injection wells in low-permeability oil reservoirs and a preparation method thereof. Background technique [0002] Water flooding is the main development method for low permeability reservoirs, but film or oil droplet residual oil still exists after water flooding. The existence of these residual oils reduces the seepage channel of water phase, which leads to the increase of water injection pressure and the decrease of water injection capacity, which in turn affects the recovery factor of water flooding. At present, the main way to solve the development problems of low-permeability reservoirs is to reduce the water injection pressure, and related inventions have been disclosed. [0003] In the Chinese patent application with the publication number CN104892855, a surfactant P...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/584C09K8/524
Inventor 张立民刘京宋显民王金忠刘彝张霞李翠霞吴训平
Owner PETROCHINA CO LTD
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