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Steam foam compound flooding composition and preparation method thereof

A composition and composite flooding technology, which is applied in the direction of drilling composition, chemical instruments and methods, etc., can solve the problems of small foam sweep coefficient and poor salt tolerance of foam agents, and achieve improved salt tolerance and increased adsorption capacity. Great and good salt tolerance effect

Active Publication Date: 2017-04-26
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] One of the technical problems to be solved by the present invention is that the foam agent in the existing steam-foam composite flooding oil recovery process has poor salt tolerance and the formed foam has a small sweep coefficient. A new steam composite flooding foam composition is provided

Method used

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  • Steam foam compound flooding composition and preparation method thereof
  • Steam foam compound flooding composition and preparation method thereof
  • Steam foam compound flooding composition and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038]The long-chain polyether nitrogen-containing compound and the long-chain diaryl sulfonate are dissolved in water with a salinity of 100,000 mg / L according to the molar ratio of 1:2, and the total mass fraction of the foaming agent is 0.3%, and they are mixed uniformly to form a foaming agent aqueous solution. Afterwards, it is mixed with steam nitrogen at a volume ratio of 0.5:1 to form the required enhanced foam flooding composition, and the ratio of nitrogen to steam is 1:1.

[0039] Take the above composition under the condition of 200 ℃, in the sand filling pipe with a length of 100 cm, a diameter of 3.8 cm, and a permeability of 1000 mD to carry out the foam plugging ability test, and record the resistance formed after the injection of foam balance and the formation of water injection. The ratio of resistance is the resistance factor, and the results are shown in Table 1.

Embodiment 2

[0041] Dissolve the long-chain polyether nitrogen-containing compound and the long-chain diaryl sulfonate in the water with a salinity of 50,000 mg / L according to the molar ratio of 1:10, and the total mass fraction of the foaming agent is 0.1%, and mix well to form a foaming agent aqueous solution. Afterwards, it is mixed with steam nitrogen according to the volume ratio of 3:1 to realize gas-liquid mixing, that is, to form the required enhanced foam flooding composition, and the ratio of nitrogen to steam is 0.3:1.

[0042] Take the above composition under the condition of 250°C, in a sand filling pipe with a length of 100 cm, a diameter of 3.8 cm, and a permeability of 1000 mD to conduct a foam plugging capacity test, and record the resistance formed after the injection of foam balance and the formation of water injection. The ratio of resistance is the resistance factor, and the results are shown in Table 1.

Embodiment 3

[0044] Dissolve the long-chain polyether nitrogen-containing compound and the long-chain diaryl sulfonate in a molar ratio of 1:0.2 in water with a salinity of 200,000 mg / L, the total mass fraction of the foaming agent is 0.3%, and mix well to form a foaming agent aqueous solution. Afterwards, it is mixed with steam nitrogen at a volume ratio of 4:1 to form the required enhanced foam flooding composition, and the ratio of nitrogen to steam is 2:1.

[0045] Take the above composition under the condition of 200 ℃, in the sand filling pipe with a length of 100 cm, a diameter of 3.8 cm, and a permeability of 1000 mD to carry out the foam plugging ability test, and record the resistance formed after the injection of foam balance and the formation of water injection. The ratio of resistance is the resistance factor, and the results are shown in Table 1.

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Abstract

The invention relates to a steam foam compound flooding composition and a preparation method thereof. The composition mainly solves the problems that in the steam foam compound flooding oil extraction process in the prior art, a foaming agent precipitates when facing divalent ions, and formed foam has low plugging capability. The steam foam compound flooding composition comprises a long-chain polyether nitrogen containing compound, long-chain diaryl sulfonate, mineralized water and gas, and steam; the long chain polyether nitrogen containing compound and long-chain diaryl sulfonate are dissolved in mineralized water and are mixed with gas and steam in order to form foam, wherein the long-chain polyether nitrogen containing compound comprises the molecular general formula shown in the formula (I), and the long-chain diaryl sulfonate surfactant has the molecular general formula shown in the formula (II). The technical scheme can better solve the problem, in the condition that mineralization is 0-300000mg / L and temperature is 200 DEG C, formed foam resistance factor reaches 100, and the composition can be used in the steam foam compound flooding process.

Description

technical field [0001] The invention relates to a steam composite flooding foam composition and a preparation method. Background technique [0002] my country is rich in heavy oil resources. Heavy oil has the characteristics of high viscosity and high density, which makes development more difficult and less effective. Steam flooding and steam huff and puff technology are currently the main means of developing heavy oil, but due to the difference in density and viscosity between steam and oil-water, steam overlaps flow and viscous fingering in the reservoir, and steam appears in reservoirs with severe heterogeneity. Channeling. [0003] Foam-assisted steam flooding is to add a foaming agent during steam injection. Foam is a compressible non-Newtonian fluid that seeps selectively in formations. Plug the high permeability zone, improve the injection profile of steam flooding, increase the sweep coefficient, and effectively suppress the overburden and channeling of steam. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/584C09K8/508
CPCC09K8/5086C09K8/584
Inventor 何秀娟何良好裘鋆吴国英陈安猛
Owner CHINA PETROLEUM & CHEM CORP
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