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A kind of biological source composite oil displacement system and its preparation method and oil displacement method

A compound oil displacement and biological source technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the low flooding efficiency of single biopolymer, the environmental hazards of chemically synthesized oil displacement agents, and poor temperature and salt resistance etc. to achieve superior rheological properties, a wide range of applicable oil reservoirs, and low molecular weight

Inactive Publication Date: 2020-10-16
RES INST OF SHAANXI YANCHANG PETROLEUM GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the serious environmental hazards of chemically synthesized oil displacement agents, poor temperature and salt resistance, and low efficiency of single biosurfactant flooding or single biopolymer flooding

Method used

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  • A kind of biological source composite oil displacement system and its preparation method and oil displacement method
  • A kind of biological source composite oil displacement system and its preparation method and oil displacement method
  • A kind of biological source composite oil displacement system and its preparation method and oil displacement method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Example 1 Biological Safety Evaluation Experiment

[0021] (1) Proportion of the oil displacement system: by mass percentage, including 0.06% of welan gum, 0.60% of lipopeptide biosurfactant, 0.05% of SAS-60, and the rest is formation water.

[0022] (2) Preparation method of oil displacement system: add welan gum into formation water, prepare a welan gum solution with a mass concentration of 0.60%, stir and dissolve at room temperature for 3 hours, then add lipopeptide biosurfactant and SAS-60 Add to the above-mentioned welan gum solution in sequence, then add formation water until the mass percentage of welan gum is 0.06%, the mass percentage of lipopeptide biosurfactant is 0.60%, and the mass percentage of SAS-60 is 0.05%, stirring at room temperature Dissolved for 1 hour to obtain an oil displacement system.

[0023] (3) Skin irritation test: the back hair of the mouse was cut off, and the above-mentioned oil-displacing system was rubbed on the normal skin and the ...

Embodiment 2

[0025] Example 2 Compatibility experiment with high temperature and high salinity formation conditions

[0026] (1) The ratio and preparation method of the oil displacement agent are as described in Example 1.

[0027] (2) Seal the above-mentioned composite oil displacement agent system in an iodine bottle, place it in a constant temperature box at 100°C, and after 48 hours, no precipitation, flocculation or suspended matter occurs under the conditions of high-temperature and high-salinity reservoirs, It shows that it has good compatibility with reservoir conditions and will not block the formation.

Embodiment 3

[0028] Example 3 Interfacial tension and viscosity of composite flooding system under different component concentration conditions

[0029] (1) Proportion of the oil displacement system: in terms of mass percentage, it includes 0.04-0.06% of welan gum, 0.40-0.60% of lipopeptide biosurfactant, 0.03-0.05% of SAS-60, and the rest is formation water. The specific mass percentages of each component are shown in Table 1.

[0030] (2) The preparation method of the oil displacement system is as described in Example 1.

[0031] (3) Seal the above composite oil displacement agent system in an iodine bottle, place it in a constant temperature box at 100°C, and measure the viscosity of the oil displacement system after 48 hours. g / cm 3 ) oil-water interfacial tension. The interfacial tension was measured by a TX-500 spinning drop interfacial tensiometer produced by the University of Texas. The apparent viscosity was measured by the Haake RS6000 rotational rheometer of Thermoelectric C...

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Abstract

The invention discloses a biological source compound flooding system as well as a preparation method and a flooding method. The biological source compound flooding system is prepared from the following components in percentage by mass: 0.04 to 0.06 percent of welan gum, 0.40 to 0.60 percent of a lipopeptide biosurfactant, 0.03 to 0.05 percent of SAS-60 and the balance of formation water. Under the conditions that the reservoir temperature is 75 to 100 DEG C, the total salinity of the formation water is 30,000 to 50,000mg / L and the content of divalent metal ions of calcium and magnesium is 3000 to 7500mg / L, the oil-water interfacial tension can be reduced to 0.0024mN / m by the compound flooding system. The water flooding efficiency can be increased by 18.1 percent by using a compound section slug displacement method. Main agents of the compound flooding system disclosed by the invention all belong to biological origin and have no toxicity or low toxicity; in addition, the additive SAS-60 has good biodegradability, so that greenness and environment friendliness are realized. The compound flooding system has the advantages of high-temperature resistance, high mineralization degree and more obvious flooding effect, and can meet the demands of green and efficient development of an oilfield.

Description

technical field [0001] The invention belongs to the field of oil field chemistry, and relates to a biological source compound oil displacement system and an oil displacement method thereof. Background technique [0002] Traditional chemical oil displacement agents are easy to improve water flooding efficiency, but they have insurmountable defects. After a large amount of chemical oil displacement agent is injected into the formation, it is not easy to biodegrade, damage the reservoir, pollute the groundwater resources, and destroy the ecological environment of the oil reservoir. In addition, chemical oil displacement agents have high requirements on reservoir conditions. The salinity of the formation water and the content of calcium and magnesium divalent metal ions are high, and the oil layer with high temperature is poorly compatible with the chemical oil displacement agent, and the oil displacement effect is greatly reduced. As a green and high-efficiency oil displaceme...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/584C09K8/588C09K8/58
CPCC09K8/58C09K8/584C09K8/588
Inventor 高怡文高瑞民王成俊陈治军薛媛倪军江邵静赵丽金志康宵瑜
Owner RES INST OF SHAANXI YANCHANG PETROLEUM GRP
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