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Oil displacement method implemented by aid of viscous-elastic surfactants

A technology of surfactant and oil displacement method, which is applied in chemical instruments and methods, earthwork drilling, and drilling composition, etc. Critical micelle concentration, improved oil displacement efficiency, and increased surface activity

Active Publication Date: 2014-08-06
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is the problem of difficult polymer injection and low oil displacement efficiency in low-permeability reservoirs in the prior art, and provides an oil displacement method using viscoelastic surfactants

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1) In parts by mass, take nonylphenol polyoxypropylene polyoxyethylene ether betaine [a=8, b=2, R 2 =CH 3 , R 3 =CH 3 , R 4 =CH 2 CH(OH)CH 2 ,X - = SO 3 - ] 5 parts, sodium octadecyl polyoxypropylene polyoxyethylene ether hydroxypropane sulfonate [c=2,d=4, R 6 =CH 2 CH(OH)CH 2 ,Y=SO 3 Na] 1 part, 6 parts of ethanol and 6.5 parts of 2wt% sodium chloride aqueous solution were sequentially added to the reaction flask, the temperature was raised to 65°C and stirred for 3 hours, and the ethanol was removed by distillation under reduced pressure to obtain the desired viscoelastic surfactant. Add formation water from low-permeability reservoirs in Sha 7 Oilfield, Jiangsu (total salinity TDS is 20,000 mg / L), prepare 1.0wt% viscoelastic surfactant formation aqueous solution, dilute to different concentrations with water of the same salinity, and measure The viscosity of the system and its oil-water interfacial tension with the dehydrated crude oil in this block, the ...

Embodiment 2

[0033] 1) In parts by mass, tetradecyl polyoxypropylene polyoxyethylene ether betaine [a=4, b=8, R 2= CH 3 , R 3 = CH 3 , R 4 =CH 2 CH 2 ,X - = SO 3 - ] 20 parts, potassium nonylphenol polyoxypropylene polyoxyethylene ether ethanesulfonate [c=8,d=6, R 6 =CH 2 CH 2 ,Y=SO 3 K] 1 part, 20 parts of isopropanol and 25 parts of 5wt% sodium chloride aqueous solution were added to the reaction flask successively, the temperature was raised to 80°C and stirred for 3 hours, and the isopropanol was removed by distillation under reduced pressure to obtain the required viscoelastic surfactant . Same as [Example 1] 1) prepare 1.0wt% viscoelastic surfactant formation aqueous solution, measure oil-water interfacial tension and viscosity when different concentrations, the total salinity TDS of formation water used is 15000 mg / liter, the results are shown in Table 2 shown.

[0034] 2) Same as [Example 1] 2), except that the oil displacement temperature is 75°C, and the concentrati...

Embodiment 3

[0038] 1) In parts by mass, take dodecylphenol polyoxypropylene polyoxyethylene ether betaine [a=6, b=2, R 2= CH 2 CH 2 OH,R 3 =CH 2 CH 2 OH,R 4 =CH 2 CH 2 ,X - = SO 3 - ] 2 parts, sodium octadecyl polyoxypropylene polyoxyethylene ether hydroxypropane sulfonate [c=2,d=4, R 6 =CH 2 CH(OH)CH 2 ,Y=SO 3 Na] 1 part, 3 parts of isopropanol and 3.5 parts of deionized aqueous solution were sequentially added to the reaction flask, the temperature was raised to 80°C and stirred for 1 hour, and the isopropanol was removed by vacuum distillation to obtain the desired viscoelastic surfactant. Same as [Example 1] 1) prepare 1.0wt% viscoelastic surfactant formation aqueous solution, measure oil-water interfacial tension and viscosity at different concentrations, the results are shown in Table 3.

[0039] 2) Same as [Example 1] 2), except that the core permeability is 10.8×10 -3 μm 2 , and the results are shown in Table 7.

[0040] table 3

[0041] Concentration ...

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Abstract

The invention relates to an oil displacement method implemented by the aid of aqueous solution of viscous-elastic surfactants. The oil displacement method mainly solves problems of difficulty in performing injection accumulation on low-permeability oil reservoirs and low oil displacement efficiency in the prior art. The technical scheme includes that that oil displacement method implemented by the aid of the viscous-elastic surfactants includes enabling rock cores containing crude oil to be in contact with oil displacement agents under the conditions that the oil displacement temperatures range from 40 DEG C to 100 DEG C and the total dissolved solid (TDS) in each liter of formation water is higher than 500 milligrams, and displacing the crude oil in the rock cores; the oil displacement agents contain the viscous-elastic surfactants and the formation water, and the concentration of the viscous-elastic surfactants in the oil displacement agents range from 0.01wt% to 1.5wt%; the viscous-elastic surfactants comprise zwitterionic surfactants and anionic-nonionic surfactants, and a mass ratio of the zwitterionic surfactants to the anionic-nonionic surfactants is 1:(100-1). The oil displacement method has the advantages that the problems can be effectively solved, and the oil displacement method is applicable to tertiary oil extraction production of low-permeability oil reservoirs.

Description

technical field [0001] The invention relates to an oil displacement method using a viscoelastic surfactant. Background technique [0002] There is no uniform and fixed standard and boundary for low-permeability oilfields in the world, it is only a relative concept. In my country, low-permeability oilfields are generally divided into three categories according to the average permeability of reservoirs. The first category is general low-permeability oil fields, the average permeability of oil layers is 10.1~150×10 -3 μm 2 ; The second category is ultra-low permeability oilfields, the average permeability of oil layers is 1.1~10×10 -3 μm 2 ; The third category is ultra-low permeability oil fields, the average permeability of oil layers is 0.1~1.0×10 -3 μm 2 , the oil layer is very dense and bound. Low-permeability sandstone reservoirs have huge resource potential and are relatively difficult to explore and develop, and are currently the focus of domestic and foreign pet...

Claims

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Application Information

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IPC IPC(8): E21B43/22C09K8/584
Inventor 沈之芹陈安猛李应成吴国英
Owner CHINA PETROLEUM & CHEM CORP
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