Heat-resistant and salt-tolerant polymer oil-displacing agent and preparation method thereof

A technology of temperature and salt resistance and polymer, which is applied in drilling compositions, chemical instruments and methods, etc., can solve the problems of high comprehensive water content, poor temperature and salt resistance, and higher requirements for temperature and salt resistance. The effect of enhanced oil recovery, good high temperature resistance, and shortened dissolution time

Active Publication Date: 2015-11-25
华鼎鸿基采油技术服务(北京)有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, the temperature of the reservoir is higher than 75°C, and the salinity of formation water is higher than 30000mg·L -1 (Ca 2+ , Mg 2+ >1665mg·L -1 ), high-temperature and high-salt oil reservoirs with high crude oil viscosity, high comprehensive water content, and high salinity of injected sewage account for a considerable amount of resources. This part of the oil reservoir has high temperature and salt resistance requirements for oil displacement agents and oil displacement systems. Higher; while the currently disclosed polymer flooding, such as HPAM, has a service temperature below 70°C and has poor temperature and salt resistance. The effect of oil flooding is not ideal under high-temperature and high-salt conditions, which limits the application of HPAM polymer flooding system in high-temperature or high-salt reservoirs

Method used

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  • Heat-resistant and salt-tolerant polymer oil-displacing agent and preparation method thereof
  • Heat-resistant and salt-tolerant polymer oil-displacing agent and preparation method thereof
  • Heat-resistant and salt-tolerant polymer oil-displacing agent and preparation method thereof

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preparation example Construction

[0033] The present invention also provides a preparation method of a temperature-resistant and salt-resistant polymer oil displacement agent, comprising:

[0034] Mixing and copolymerizing the compound represented by the formula (I-1), acrylamide and the compound represented by the formula (I-2) to obtain a temperature-resistant and salt-resistant polymer oil displacement agent;

[0035]

[0036] Wherein, m is 0-4, n is 1-5;

[0037]

[0038] Wherein, the mass ratio of the compound represented by the formula (I-1), acrylamide and the compound represented by the formula (I-2) is preferably (3-15): (30-70): (20-40) , more preferably (5-12): (35-65): (25-35), most preferably (8-10): (40-60): (28-33).

[0039] Specifically, the present invention preferably prepares the temperature-resistant and salt-resistant polymer oil displacement agent according to the following method:

[0040] 3-1) mixing the compound represented by formula (I-1), acrylamide and the compound represen...

Embodiment 1

[0056] 50 parts by weight of acrylamide, 8.5 parts by weight of sulfonic acid monomers (m=0, n=1) containing phenyl and alcoholic hydroxyl groups, containing 28 parts by weight of the carboxylic acid monomer of the amido group and 500 parts by weight of deionized water are stirred until completely dissolved to obtain a mixed solution;

[0057] Use sodium hydroxide to adjust the pH value of the mixed solution to 9.8, then add 0.05 parts by weight of disodium ethylenediamine tetraacetate, 0.1 parts by weight of urea, and 0.15 parts by weight of a solubilizer to the polymerization bottle in sequence, and stir until it dissolves evenly to obtain adjuvanted agent mixture;

[0058] Control the initial temperature of the mixed liquid system with auxiliary agents at 5°C, pass nitrogen and deoxygenate for 20-30 minutes, add redox-azo water-soluble composite initiators (0.08 parts by weight of ammonium persulfate, 0.04 parts by weight of sodium formaldehyde sulfoxylate) , azobisisobuty...

Embodiment 2

[0065] 50 parts by weight of acrylamide, 8 parts by weight of sulfonic acid monomers (m=1, n=2) containing phenyl and alcoholic hydroxyl groups, containing 35 parts by weight of carboxylic acid monomer of amide group and 700 parts by weight of deionized water are stirred until completely dissolved to obtain a mixed solution;

[0066] Use sodium hydroxide to adjust the pH value of the mixed solution to 8.1, add 0.05 parts by weight of disodium edetate, 0.1 parts by weight of urea, and 0.15 parts by weight of solubilizer to the polymerization bottle in sequence, and stir until it dissolves evenly to obtain the adjuvant of the mixture.

[0067] Control the initial temperature of the mixed liquid system with auxiliary agents at 5°C, pass nitrogen to remove oxygen for 20 to 30 minutes, add redox-azo water-soluble composite initiators (0.08 parts by weight of ammonium persulfate, 0.04 parts by weight of sodium formaldehyde sulfoxylate) , azobisisobutylamidine hydrochloride 0.18 par...

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Abstract

The invention provides a heat-resistant and salt-tolerant polymer oil-displacing agent and a preparation method thereof. The heat-resistant and salt-tolerant polymer oil-displacing agent has the structure shown in the formula (I) (in the description); both a structural unit, namely a structural unit of sulfonic acid containing a phenyl group and hydroxyl groups, shown in the formula (I-1) (in the description) and a structural unit of sodium-3-acrylamido-3-methylbutanoate are introduced onto a polyacrylamide molecular main chain, so that the heat-resistant and salt-tolerant polymer oil-displacing agent has good high temperature resistance and salt tolerance when being applied to polymer flooding in an oil field; when acting on a high-temperature or high-salinity oil reservoir of which the temperature is higher than 80 DEG C and the formation water salinity is greater than 30000 mg.L<-1> (Ca<2+> and Mg<2+> are greater than 1665 mg.L<-1>), the polymer oil-displacing agent has the advantage that the oil recovery ratio is greatly increased in comparison with other polymer oil-displacing agents under the same conditions, so that an effective solution is provided for further improvement of the polymer flooding effect.

Description

technical field [0001] The invention relates to the field of enhanced oil recovery, in particular to a temperature-resistant and salt-resistant polymer oil displacement agent and a preparation method thereof. Background technique [0002] Most of my country's oil fields are continental sedimentary reservoirs, with many oil layers, large differences, and serious heterogeneity. The early development mode is mostly water injection. However, long-term water flooding causes new secondary pores to appear in the formation, and then forms many water channeling channel wells, which greatly reduces the water flooding efficiency and causes energy waste, and the comprehensive water content of the oil field is always as high as 80%. [0003] In response to this situation, EOR technology is mainly used at home and abroad to improve the recovery of oil reservoirs after water flooding. In view of the specific characteristics of domestic oil reservoirs and crude oil, chemical flooding techn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F212/14C08F222/38C08F4/40C08F4/04C09K8/588
Inventor 张宁卢琼王江红杨雪
Owner 华鼎鸿基采油技术服务(北京)有限公司
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