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A composite surfactant flooding system for high calcium and magnesium reservoirs

A composite surfactant, high calcium and magnesium technology, applied in drilling compositions, chemical instruments and methods, etc., to achieve excellent oil displacement performance, solution stability, and good oil displacement performance.

Inactive Publication Date: 2021-09-24
QINGDAO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although there have been many reports on surface-active flooding, the existing surface-active flooding technology is only suitable for oil reservoirs with crude oil viscosity less than 120 mPa·s. 1,500 mg / L and oil reservoirs with a salinity higher than 20,000 mg / L, there is no suitable surface active oil displacement agent, so special research and development is required

Method used

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  • A composite surfactant flooding system for high calcium and magnesium reservoirs
  • A composite surfactant flooding system for high calcium and magnesium reservoirs

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Dissolve dodecylsulfonic acid anionic gemini surfactant and lauric acid diethanolamide in simulated formation water respectively, stir for 0.5 hour, and configure a surfactant aqueous solution with a mass percent concentration of 0.05% to obtain a surfactant compound system. The calcium and magnesium ion content of the simulated formation water is about 2000 mg / L, and the total salinity is about 20000 mg / L.

Embodiment 2

[0020] Dissolve dodecylsulfonic acid anionic gemini surfactant and lauric acid diethanolamide in simulated formation water respectively, stir for 1 hour, and configure a surfactant aqueous solution with a mass percent concentration of 0.30% to obtain a surfactant compound system. The calcium and magnesium ion content of the simulated formation water is about 2000 mg / L, and the total salinity is about 50000 mg / L.

Embodiment 3

[0022] Dissolve dodecylsulfonic acid anionic gemini surfactant and lauric acid diethanolamide in simulated formation water respectively, stir for 1 hour, and configure a surfactant aqueous solution with a mass percent concentration of 0.05% to obtain a surfactant compound system. The calcium and magnesium ion content of the simulated formation water is about 2000 mg / L, and the total salinity is about 100000 mg / L.

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Abstract

The invention discloses a composite surfactant oil displacement system suitable for high-calcium-magnesium oil reservoirs. The composite system is characterized in that it consists of the following components in proportion by weight: the sulfonic acid-based anionic gemini surfactant is 0.010~0.30%, 0.020~0.60% of diethanolamine laurate, and 99.00~99.95% of formation water to obtain a surfactant compound system. The prepared surfactant compound system can make the oil / water interfacial tension less than 10 under the condition of reservoir with high formation water salinity ‑3 mN / m, has excellent oil displacement performance and good stability.

Description

technical field [0001] The invention relates to oil field tertiary oil recovery technology, in particular to a composite surfactant oil displacement system for high calcium and magnesium oil reservoirs. Background technique [0002] In the late stage of oil exploitation, it is difficult to stabilize production and the development situation is severe. Under current water flooding conditions, the recovery rate is only 35-45%, and most of the crude oil remains in the formation and is difficult to extract. Surfactant flooding, as an effective way to enhance oil recovery, has been one of the hot spots in tertiary oil recovery research at home and abroad. At present, the widely used surfactants for oil displacement mainly include anionic, nonionic and amphoteric surfactants. When screening surfactant flooding systems, one of the most important indicators is the ability to reduce the oil / water interfacial tension to ≤10 -2 mN / m. [0003] Surfactants currently used for tertiary ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/584
CPCC09K8/584
Inventor 张晓东李小洋陈照军杜辉刘召英
Owner QINGDAO UNIV