Sewage-resistant polymer for oil extraction and preparation method thereof

A polymer and sewage technology, which is used in the preparation of sewage-resistant polymers for oil production and the field of sewage-resistant polymers for oil production, can solve the problems of reduced recovery rate, increased difficulty in matching, and inability to discharge sewage, and achieve viscosity retention. high oil recovery rate, enhanced oil recovery, good solubility and viscosifying effect

Active Publication Date: 2021-08-13
黑龙江吉地油田服务股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the gradual expansion of the scale of tertiary oil recovery, the development object has shifted from Type I and Type II A oil layers to Type II B and Type III oil layers, the physical properties of the oil layers have deteriorated, the matching difficulty has increased, and the oil displacement effect has deteriorated; at the same time, in order to meet the needs of environmental protection , the sewage cannot be discharged outside, and the preparation method of some polymer flooding blocks is changed from clean and thin (clean water preparation, clean water dilution) to clean and sewage thin (clear water preparation, sewage dilution), the amount of dry powder has increased significantly, and the recovery rate is lower than that of clean preparation Thinness decreased by 1 to 3 percentage points

Method used

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  • Sewage-resistant polymer for oil extraction and preparation method thereof
  • Sewage-resistant polymer for oil extraction and preparation method thereof
  • Sewage-resistant polymer for oil extraction and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A sewage-resistant polymer for oil recovery and a preparation method thereof:

[0031] (1) 100 parts of acrylamide, 10 parts of acrylic acid, 10 parts of sulfonate, 10 parts of grafted sulfonated starch, and 300 parts of water were mixed and stirred evenly, and the pH was adjusted to 7.5 with 10% sodium hydroxide solution;

[0032] Wherein, the structure of sulfonate is as follows:

[0033]

[0034] (2) After adjusting the temperature of the solution prepared in step (1) to 8°C, transfer it to an adiabatic polymerization kettle, and then pass through nitrogen for 30 minutes to remove oxygen, then add 0.05 parts of sodium persulfate to the polymerization kettle, and then add sodium persulfate after 5 minutes. Add 0.05 part of sodium bisulfate, add 0.1 part of azobisisobutyronitrile after another 5 minutes, stop feeding nitrogen after the system in the kettle starts to heat up, and continue aging for 2 hours after the reaction is completed until the temperature is no l...

Embodiment 2

[0042] A sewage-resistant polymer for oil recovery and a preparation method thereof:

[0043](1) 120 parts of acrylamide, 10 parts of acrylic acid, 20 parts of sulfonate, 10 parts of grafted sulfonated starch, and 350 parts of water were mixed and stirred evenly, and the pH was adjusted to 7.5 with 10% sodium hydroxide solution;

[0044] Wherein, the structure of sulfonate is as follows:

[0045]

[0046] (2) After adjusting the temperature of the solution prepared in step (1) to 8°C, transfer it to an adiabatic polymerization kettle, and then pass nitrogen gas for 30 minutes to remove oxygen, then add 0.1 part of potassium persulfate to the polymerization kettle, and add three Add 0.1 part of ethanolamine, add 0.2 part of azobisisobutylamidine hydrochloride after another 5 minutes, stop feeding nitrogen after the system in the kettle starts to heat up, and continue to ripen for 2 hours after the reaction is completed until the temperature is no longer raised to obtain a po...

Embodiment 3

[0054] A sewage-resistant polymer for oil recovery and a preparation method thereof:

[0055] (1) 120 parts of acrylamide, 10 parts of acrylic acid, 20 parts of sulfonate, 20 parts of grafted sulfonated starch, and 400 parts of water were mixed and stirred evenly, and the pH was adjusted to 7.5 with 10% sodium hydroxide solution;

[0056] Wherein, the structure of sulfonate is as follows:

[0057]

[0058] (2) After adjusting the temperature of the solution prepared in step (1) to 8°C, transfer it to an adiabatic polymerization kettle, and then pass nitrogen gas for 30 minutes to remove oxygen, then add 0.1 part of potassium persulfate to the polymerization kettle, and add three Add 0.1 part of ethanolamine, add 0.2 part of azobisisobutylamidine hydrochloride after another 5 minutes, stop feeding nitrogen after the system in the kettle starts to heat up, and continue to ripen for 2 hours after the reaction is completed until the temperature is no longer raised to obtain a p...

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Abstract

The invention discloses a sewage-resistant polymer for oil extraction and a preparation method thereof, and relates to the technical field of oil exploitation. The sewage-resistant polymer comprises acrylamide, acrylic acid, grafted sulfonated starch, sulfonate, an initiator and other components. The sewage-resistant polymer for oil extraction is prepared through polymerization of acrylamide, grafted sulfonated starch and sulfonate. The polymer has the characteristics of temperature resistance, salt resistance, antibiosis, high viscosity retention rate and capability of being prepared from oilfield produced sewage, can keep good solubility and tackifying effect under the sewage condition, and can improve the oil recovery rate to a relatively high extent.

Description

Technical field: [0001] The invention relates to the technical field of petroleum exploitation, in particular to a sewage-resistant polymer for oil recovery, and in particular to a preparation method of a sewage-resistant polymer for oil recovery. Background technique: [0002] With the rapid development of our country's economy and the continuous progress of society, oil, as an important industrial energy and chemical raw material, its demand is growing at a rapid rate. The stable supply of oil resources is inseparable from the stable development of the social economy and the guarantee of people's production and living quality. As the most important unit of oil extraction and gathering and transportation, the oil field has a direct impact on the production and quality of oil if its extraction technology is good or bad. [0003] Since polymer flooding began to be applied industrially in 1996, it has achieved great success. Polymer flooding has become an important support f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F285/00C08F220/56C08F220/06C08F251/00C08F216/14
CPCC08F285/00C08F251/00C08F216/1475C08F220/56C08F220/06Y02W30/74
Inventor 孙安顺
Owner 黑龙江吉地油田服务股份有限公司
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