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Oil displacement composition used for low permeability oil reservoirs, and preparation method thereof

An oil displacement method and a low-permeability technology, which are applied in the field of oil-displacing compositions for low-permeability oil reservoirs and their preparation, can solve problems such as difficulty in injection and formation blockage, and achieve the effects of improving oil displacement efficiency and overcoming cohesion.

Active Publication Date: 2014-10-22
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] One of the technical problems to be solved by the present invention is that the polymers in the existing chemical composite flooding are used in the oil displacement process of low permeability reservoirs to easily cause formation plugging and difficult injection problems, and provide the oil displacement combination for low permeability reservoirs The oil displacement composition has the advantages of reducing pressure and increasing injection while forming an ultra-low interfacial tension between oil and water, and the system is simple

Method used

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  • Oil displacement composition used for low permeability oil reservoirs, and preparation method thereof
  • Oil displacement composition used for low permeability oil reservoirs, and preparation method thereof
  • Oil displacement composition used for low permeability oil reservoirs, and preparation method thereof

Examples

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Effect test

Embodiment 1

[0031] Put 9-octadecenoic acid and N,N-dimethyl-1,4-butanediamine into the reaction kettle in a molar ratio of 1:1.5, stir at 165°C for 8h, and then remove the residue by vacuuming with an oil pump at 165°C. The content of the reacted N,N-dimethyl-1,4-butanediamine is 99.0wt% as determined by liquid chromatography. Then add 4-chlorobutyrate to the above system according to the molar ratio of 9-octadecenoic acid and 4-sodium chlorobutyrate of 1:1.5, and react with 85 ° C for 6 hours. After the reaction is completed, wash with absolute ethanol to remove After the unreacted sodium 4-chlorobutyrate was evaporated to remove the solvent, octadecenamide butyl betaine was obtained, and the content was 97.0 wt%.

[0032] Mix octadecenamide butyl betaine and NaCl in a mass ratio of 1:10 to form an oil displacement composition. The oil displacement composition and water are mixed uniformly in a mass ratio of 5.5:100. The size of the micelles formed by ZS90 was measured at 25 °C, and the...

Embodiment 2

[0037] Put 12-tetracosenoic acid and N,N-dimethyl-1,2-ethylenediamine into the reaction kettle according to the molar ratio of 1:3, stir at 160°C for 10h, and then remove the oil pump vacuum at 165°C The content of unreacted N,N-dimethyl-1,2-ethylenediamine was 98.9wt% as determined by liquid chromatography. Then add sodium 2-chloroethyl sulfonate to the above system according to the molar ratio of 12-tetracosenoic acid and sodium 2-chloroethyl sulfonate of 1:3, and react with 80 ° C for 10 h. After the reaction is completed, use The unreacted sodium 2-chloroethyl sulfonate is removed by washing with absolute ethanol, and the solvent is evaporated to obtain tetraenamidoethyl betaine with a content of 97.1 wt%.

[0038] Combining tetraenamidoethyl betaine with CaCl 2 The oil displacement composition was mixed according to the mass ratio of 1:5. The oil displacement composition was evenly mixed with water according to the mass ratio of 3:100. The size of the micelles formed at ...

Embodiment 3

[0043] 7,15-Tridecenoic acid and N,N-dimethyl-1,2-ethylenediamine were put into the reaction kettle according to the molar ratio of 1:2, stirred at 170°C for 20h, and then evacuated by oil pump at 165°C After removing unreacted N,N-dimethyl-1,2-ethylenediamine, the content of triaconenamide ethylenediamine was determined by liquid chromatography to be 99.0wt%. Then add sodium chloromethanesulfonate to the above system according to the molar ratio of 7,15-tridecenoic acid and sodium chloromethanesulfonate of 1:1.5, and react with 95 ° C for 3 hours. After the reaction, wash with absolute ethanol to remove After the unreacted sodium chloromethanesulfonate was evaporated to remove the solvent, the trienamidoethyl betaine was obtained, and the content was 97.3 wt%.

[0044] Combining Triaconamidoethyl Betaine with NaHCO 3 The oil displacement composition was mixed according to the mass ratio of 1:2. The oil displacement composition was mixed with water according to the mass ratio...

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Abstract

The invention relates to an oil displacement composition used for low permeability oil reservoirs, and a preparation method thereof, and mainly solves the problems of easy stratum obstruction and difficult injection in the low permeability oil reservoir oil displacement process of present composite flooding polymers. The oil displacement composition contains a long carbon chain betaine surfactant and an inorganic salt, wherein the long carbon chain betaine surfactant is anyone selected from long chain carboxylic acid betaine and sulfonic acid betaine, the carbon chain is a C14-C40 alkyl or alkenyl group, the inorganic salt is anyone of or a composition of CaCl2, MgCl2, NaCl and NaHCO3, and a mass ratio of the long carbon chain betaine surfactant to the inorganic salt is 1:(1-100). The oil displacement composition has the advantages of formation of oil-water ultralow interface tension, decompression and augmented injection, and simple system, well solves the problems, and can be used in the intensified oil production process of the low permeability oil reservoirs.

Description

technical field [0001] The present invention relates to an oil-displacing composition for low-permeability oil reservoirs and a preparation method thereof. Background technique [0002] Most of the main oil fields on land in my country have entered the middle and late development stage, and the water content and oil recovery degree are getting higher and higher. Because low-permeability reservoirs generally have the characteristics of small pore throats, non-Darcy seepage and high starting pressure, the surface molecular force and capillary force are strong, and the liquid can flow only when there is a large displacement pressure. Therefore, reducing pressure and increasing injection is a crucial factor to enhance the recovery of these reservoirs. [0003] The oil displacement methods currently used in crude oil production can be divided into four categories: one is thermal flooding, including steam flooding, combustion of oil layers, etc.; the other is miscible flooding, i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/584
CPCC09K8/584
Inventor 张卫东何秀娟张慧李应成沙鸥
Owner CHINA PETROLEUM & CHEM CORP
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