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Oil displacement agent composition and preparation method and application thereof

A technology of oil-displacing agent and composition, applied in the field of oil-displacing agent composition and its preparation, to achieve the effects of improving development effect, improving oil washing efficiency, and ultra-low interfacial tension

Active Publication Date: 2019-05-28
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the methods in the prior art mainly improve the oil recovery by emulsification and viscosity reduction, and improve the fluidity of the heavy oil, which has little effect on the improvement of the sweep efficiency, so the improvement effect of the oil recovery needs to be further improved.

Method used

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  • Oil displacement agent composition and preparation method and application thereof
  • Oil displacement agent composition and preparation method and application thereof
  • Oil displacement agent composition and preparation method and application thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0049] According to the present invention, the preparation method of the oil displacement agent composition includes providing the first solution and gas respectively, and the preparation method of the first solution includes: cationic surfactant, amphoteric surfactant, alcohol, polymer mixed with water,

[0050] The cationic surfactant is tetraalkylammonium chloride and / or tetraalkylammonium bromide, preferably, at least one alkyl group is a long-chain alkyl group containing 12-18 carbon atoms, and other alkyl groups are independently selected from One of methyl, ethyl, propyl and butyl, more preferably, one or two alkyl groups are long-chain alkyl groups containing 12-18 carbon atoms, and other alkyl groups are independently selected from methyl groups or ethyl;

[0051] The amphoteric surfactant is a trialkyl betaine represented by the following formula, wherein at least one R is a long-chain alkyl group containing 10-18 carbon atoms, and other Rs are each independently se...

Embodiment 1

[0071] This example is used to illustrate the preparation and performance of the oil displacement agent composition provided by the present invention.

[0072] (1) Weigh 800g of clear water (salinity is 0mg / L), add polyacrylamide ammonium (viscosity average molecular weight 3000×10 4 , degree of hydrolysis 20 mol%) 3g, stirred and dissolved for 4h. Add 3 g of cationic surfactant dimethyl dioctadecyl ammonium chloride, add 3 g of octadecyl dimethyl betaine, then add 0.5 g of ethanol, add water to 1000 g, stir for 20-30 min until completely dissolved, and obtain An aqueous solution of the non-gaseous components of an oil displacing composition.

[0073] The gas in the oil displacing composition is CO 2 , under the same pressure conditions, CO 2 The volume content is 1 time of the total volume of the non-gas phase component mixture.

[0074] (2) Take the above aqueous solution and heavy oil (viscosity 9600mPa.s at 50°C), and use Model TX500C interfacial tension to measure the...

Embodiment 2

[0076] This example is used to illustrate the effect of using the oil-displacing agent composition of the present invention for oil-displacement on enhanced recovery of heavy oil.

[0077] A rock core with a size of 4.5mm×4.5mm×300mm and a permeability of 3000md was used to conduct the enhanced oil recovery experiment (the oil displacement agent is the same as in Example 1). The core was dried, vacuumed and saturated with water, saturated with heavy oil at 70°C (same as in Example 1), and aged for 48 hours. (1) Water flooding at an injection rate of 1.5mL / min to a water content of 95% by volume. (2) Inject 0.05 PV of the non-gas phase component aqueous solution in the oil displacement agent composition of Example 1 at an injection rate of 1.5 mL / min, and inject CO at an injection rate of 1.0 mL / min. 2 0.05PV, repeated alternate injection for 3 cycles. (3) Continue water flooding at an injection rate of 1.5mL / min to a water content of 95% by volume.

[0078] Experimental re...

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Abstract

The invention relates to the field of oil displacement agents, and discloses an oil displacement agent composition and application thereof. The oil displacement agent composition comprises a cationicsurfactant, air, an ampholytic surfactant, alcohol, macromolecular polymer and water, wherein the cationic surfactant is tetraalkyl ammonium chloride and / or tetraalkyl ammonium bromide; the ampholyticsurfactant is trialkyl betaine; the alcohol is monohydric alcohol with 1 to 12 carbon atoms; the stabilizing time of thick oil emulsion is longer than 8h by the macromolecular polymer at the temperature of 50 DEG C. The oil displacement agent composition has the advantages that the interface tension is ultralow, the emulsifying property is good, and the foaming ability is strong; when the oil displacement agent composition is used for water drive, the flowing drag of water phase is increased, so that the application efficiency is effectively improved, and the production rate of oil reservoiris increased.

Description

technical field [0001] The invention relates to an oil-displacing agent composition and its preparation method and application, in particular to an oil-displacing agent composition suitable for heavy oil exploitation and its preparation method and application. Background technique [0002] Heavy oil refers to crude oil with a viscosity greater than 50mPa.s at 50°C. Heavy oil development occupies a certain proportion in my country's oil and gas development. Liaohe Oilfield, Shengli Oilfield, Xinjiang Oilfield, Zhongyuan Oilfield and Jiangsu Oilfield all have heavy oil distribution. The existing heavy oil development technology is mainly based on thermal oil recovery, which reduces the viscosity of heavy oil by heating, improves the fluidity of heavy oil, and enhances the recovery factor. The main disadvantage of thermal oil recovery is high energy consumption. For oil reservoirs with deep burial, thin oil layers and high water cut, the heat utilization rate in the thermal r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/594
Inventor 江建林
Owner CHINA PETROLEUM & CHEM CORP
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