Salt-responsive modified polyacrylamide oil displacing agent and preparation method thereof

A technology of polyacrylamide oil displacement agent and acrylamide, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., and can solve the problems of poor stability of foam flooding oil displacement agents, immature experimental methods, lack of application and practice, etc. problems, to achieve the effects of enhanced oil recovery, good responsiveness, and reduced production costs

Inactive Publication Date: 2018-03-23
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Microemulsion flooding oil displacement agents are still in the initial development stage, and the experimental methods are not mature enough
The stability of foam flooding oil displacement agent is the worst, and it lacks practical application and practice

Method used

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  • Salt-responsive modified polyacrylamide oil displacing agent and preparation method thereof
  • Salt-responsive modified polyacrylamide oil displacing agent and preparation method thereof
  • Salt-responsive modified polyacrylamide oil displacing agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] This embodiment provides a salt-responsive modified polyacrylamide oil-displacing agent, which is prepared according to the following steps:

[0031] The percentages of the various comonomers used in the synthetic salt-responsive modified polyacrylamide oil displacing agent to the total mass of the comonomers are: acrylamide 60%, sodium acrylate 30%, and the functional monomer represented by formula III 3% , The functional monomer shown in formula IV is 7%.

[0032]

[0033] The specific preparation method of the functional monomer in formula III is: adding 20 g of acrylic acid and catalyst KOH into the autoclave, heating to 115±5°C, purging and replacing with nitrogen three times, then adding 50 g of ethylene oxide, and controlling the reaction kettle The total internal pressure is 0.2-0.4MPa, and the reaction temperature is 140±5°C. After the pressure in the reactor returns, the reaction is continued for 60 minutes. Add 10 g of dodecyl alcohol, control the pressure in the...

Embodiment 2

[0037] This embodiment provides a salt-responsive modified polyacrylamide oil-displacing agent, which is prepared according to the following steps:

[0038] The percentages of various comonomers used in the synthetic salt-responsive modified polyacrylamide oil-displacing agent in the total mass of comonomers are: 65% of acrylamide, 25% of sodium acrylate, and 4% of functional monomers represented by formula V , The functional monomer shown in formula VI is 6%.

[0039]

[0040] The specific preparation method of the functional monomer in formula V is: adding 20 g of acrylic acid and catalyst KOH into the autoclave, heating to 115±5°C, purging and replacing with nitrogen three times, then adding 50 g of ethylene oxide, and controlling the reaction kettle The total internal pressure is 0.2-0.4MPa, and the reaction temperature is 140±5°C. After the pressure in the reactor returns, the reaction is continued for 60 minutes. Add 10 g of dodecanol, control the pressure in the reactor to ...

Embodiment 3

[0044] This embodiment provides a salt-responsive modified polyacrylamide oil-displacing agent, which is prepared according to the following steps:

[0045] The percentages of various comonomers used in the synthetic salt-responsive modified polyacrylamide oil displacing agent to the total mass of comonomers are: acrylamide 50%, acrylic acid 35%, and the functional monomer represented by formula VII 5%. The functional monomer represented by formula VIII is 10%.

[0046]

[0047]

[0048] The specific preparation method of the functional monomer in formula VII is: adding 20 g of acrylic acid and catalyst KOH into the autoclave, heating to 115±5°C, purging and replacing it with nitrogen three times, then adding 100 g of ethylene oxide, and controlling the reactor The total internal pressure is 0.2-0.4MPa, and the reaction temperature is 140±5°C. After the pressure in the reactor returns, the reaction is continued for 60 minutes. Add 10 g of dodecanol, control the pressure in the rea...

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Abstract

The invention provides a salt-responsive modified polyacrylamide oil displacing agent and a preparation method thereof. The raw materials of the salt-responsive modified polyacrylamide displacing agent include acrylamide, sodium acrylate, acrylic polyether polyol, acrylic polyethylene oxide-propylene oxide-ethylene sodium sulfate, an assistant, an initiator and water. The invention also provides the preparation method of the oil displacing agent. The oil displacing agent can effectively reduce the viscosity of crude oil for oil extraction, and has a good ion response intensity.

Description

Technical field [0001] The invention relates to an oil-displacing agent, in particular to a salt-responsive modified polyacrylamide oil-displacing agent and a preparation method thereof, and belongs to the technical field of petroleum exploitation. Background technique [0002] Stimulus-responsive oil-displacing agent refers to a type of oil-displacing agent that can undergo physical or chemical changes when the external environment or environmental conditions change. Due to its unique properties, this type of oil-displacing agent has huge application prospects in many fields such as oil field chemistry and petroleum exploitation. With the decrease of oil reserves and the increasing difficulty of exploitation, oil-displacing agents with adjustable performance have attracted great attention of scientific researchers. [0003] Nowadays, common chemical oil displacement agents include active water flooding oil displacement agents, micellar solution flooding agents, and microemulsion ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/588C08F283/06C08F220/56C08F220/06
CPCC08F283/065C09K8/588C08F220/56C08F220/06
Inventor 侯庆锋郭东红罗健辉王哲陈刚杨惠胡广新
Owner PETROCHINA CO LTD
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