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Salt-resistant polymer for oil displacement of oil field and preparation method thereof

A polymer and oil displacement technology, which is applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of poor polymer viscosity increasing effect, poor salt resistance, application limitations, etc., and reduce the subsequent treatment process , Improve the effect of salt resistance

Inactive Publication Date: 2015-01-28
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

[0003] Commonly used oil displacement polymers are mainly partially hydrolyzed polyacrylamide and its derivatives. Hydrolyzed polyacrylamide has poor temperature resistance. The oil effect becomes worse; the salt resistance of partially hydrolyzed polyacrylamide is poor, and polyacrylamide has a salt-sensitive effect. In the oil reservoir with high salinity, especially in high-priced metal ions, its viscosity will drop significantly, and even produce Precipitation, so partially hydrolyzed polyacrylamide is difficult to dispose with sewage
[0004] Polyacrylamide has strong hydrophilicity, is easy to form hydrogen bonds with water, is easy to dissolve in water, and has a large hydrodynamic volume after hydration, but due to the flexible chain of the molecular chain, it shows a random coil conformation in aqueous solution , in high-temperature and high-salinity brine, the molecular chain curls up, and the viscosity drops significantly, which makes the viscosifying effect of the polymer significantly worse, and the flexible chain is easy to be mechanically degraded, so its application is greatly restricted and cannot be used well. Applications that meet high temperature and high salinity

Method used

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  • Salt-resistant polymer for oil displacement of oil field and preparation method thereof
  • Salt-resistant polymer for oil displacement of oil field and preparation method thereof
  • Salt-resistant polymer for oil displacement of oil field and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 1.1 The raw material composition (parts by weight) of the salt-resistant polymer used for oil field flooding of the present invention:

[0021]

[0022]

[0023] 1.2 The preparation method of the salt-resistant polymer used for oil field flooding of the present invention:

[0024] Dissolve acrylamide in deionized water to make an aqueous solution, add acrylic acid, sodium hydroxide to neutralize to a pH value of 8, add hydrophobic monomers, polyoxyethylene stearyl ether methacrylate or polyoxyethylene cetyl ether Methacrylate, chain transfer agent, stir evenly, transfer to the reactor, add 1# initiator through nitrogen for 30 minutes, add 2# initiator through nitrogen for 10 minutes, add 3# initiator through nitrogen for 10 minutes, continue to pass nitrogen until The reaction system has a temperature rise of 1-2°C, stop the nitrogen flow, wait for the reaction system to reach the peak temperature, the temperature is between 80-95°C, transfer the reactor to a 90°C...

Embodiment 2

[0026] 2.1 The raw material composition (parts by weight) of the salt-resistant polymer used for oil field flooding of the present invention:

[0027]

[0028]

[0029] 2.2 The preparation method of the salt-resistant polymer used for oil field flooding of the present invention:

[0030] 1.2 with embodiment 1.

Embodiment 3

[0032] 3.1 The raw material composition (parts by weight) of the salt-resistant polymer used for oil field flooding of the present invention:

[0033]

[0034] 3.2 The preparation method of the salt-resistant polymer used for oil field flooding of the present invention:

[0035] 1.2 with embodiment 1.

[0036] The polymer mother liquor prepared by 5000mg / L embodiment 1-3 is diluted into 1000mg / L solution with simulated sewage (simulated sewage: 10000mg / LNaCl, 200mg / L (Ca 2+ , Mg 2+ )). The results are shown in Table 1.

[0037] Table 1

[0038]

[0039] As can be seen from Table 1, the salinity of the 1500ppm salt-resistant polymer solution used for oil field flooding of the present invention is 30000mg / LNaCl, 200mg / LCa 2+ , Mg 2+ The 90d viscosity retention rate in the solution is greater than 80%.

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Abstract

The invention discloses a salt-resistant polymer for oil displacement of an oil field and a preparation method thereof. The salt-resistant polymer comprises the following materials in parts by weight: 80-120 parts of acrylamide, 26-40 parts of acrylic acid, 1-5 parts of hydrophobic monomer, 1-5 parts of polyoxyethylene octadecanol ether methacrylate or polyoxyethylene hexadecanol ether methacrylate, 230-450 parts of deionized water and 0.1-0.3 part of chain transferring agent. The salt-resistant polymer and the preparation method disclosed by the invention have the advantages that in a formula of the polymer, since polyoxyethylene octadecanol ether methacrylate and the hydrophobic monomer are added for composite use, the salt resistance of the polymer is improved; in the formula of the polymer, polyoxyethylene octadecanol ether methacrylate is added, and a surface active agent does not need to be added in the synthesis process, so that the following treatment process is reduced; the viscosity retention rate of 1500ppm salt-resistant polymer solution is larger than 80% after the 1500ppm salt-resistant polymer solution is put in the solution with the degree of mineralization being 30000mg / L NaCl and 200mg / L Ca<2+> and Mg<2+>.

Description

technical field [0001] The invention relates to the technical field of oil field flooding, in particular to a salt-resistant polymer used for oil field flooding and a preparation method thereof. Background technique [0002] my country started the research on tertiary oil recovery technology in the 1960s. After the 1980s, tertiary oil recovery technology has developed rapidly. Most of my country's oil reservoirs are continental lacustrine deposits. The formation conditions are intricate, and the heterogeneity of oil layers is serious. The difference in internal permeability is large, and it has a wide application prospect to adapt to polymer flooding. [0003] Commonly used oil displacement polymers are mainly partially hydrolyzed polyacrylamide and its derivatives. Hydrolyzed polyacrylamide has poor temperature resistance. The oil effect becomes worse; the salt resistance of partially hydrolyzed polyacrylamide is poor, and polyacrylamide has a salt-sensitive effect. In the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/56C08F220/06C08F220/14C08F220/18C09K8/588
Inventor 孙安顺
Owner 黑龙江吉地油田服务股份有限公司
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