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Oil displacement composition for low permeability reservoir and preparation method thereof

A low-permeability and composition technology, which is applied to drilling compositions, chemical instruments and methods, etc., can solve problems such as formation blockage and injection difficulties, and achieve the effects of improving oil displacement efficiency and overcoming cohesion.

Active Publication Date: 2018-02-13
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 for low permeability reservoir and preparation method thereof
  • Oil displacement composition for low permeability reservoir and preparation method thereof
  • Oil displacement composition for low permeability reservoir and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Put 9-octadecenoic acid and N,N-dimethyl-1,4-butanediamine into the reaction kettle at a molar ratio of 1:1.5, stir at 165°C for 8 hours, and then vacuumize the oil pump at 165°C to remove untreated The reacted N,N-dimethyl-1,4-butanediamine has a content of 99.0wt% octadecenamide butanediamine as determined by liquid chromatography. Add sodium 4-chlorobutyrate to the above system according to the molar ratio of 9-octadecenoic acid to sodium 4-chlorobutyrate at 1:1.5, and react at 85°C for 6 hours. After the reaction, wash with absolute ethanol to remove After the unreacted sodium 4-chlorobutyrate was evaporated to remove the solvent, octadecylenamide butyl betaine was obtained with a content of 97.0wt%.

[0031] Octadecenamide butyl betaine and NaCl are mixed according to the mass ratio of 1:10 to form the oil displacement composition, and the oil displacement composition and water are mixed uniformly according to the mass ratio of 5.5:100, and the Malvern dynamic ligh...

Embodiment 2

[0035] Put 12-tetradecenoic 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 it by vacuuming with an oil pump at 165°C The content of unreacted N,N-dimethyl-1,2-ethylenediamine was determined by liquid chromatography to be 98.9wt%. Then add sodium 2-chloroethylsulfonate to the above system according to the molar ratio of 12-tetradecenoic acid to sodium 2-chloroethylsulfonate as 1:3, and react with 80°C for 10h. After the reaction, use Wash with absolute ethanol to remove unreacted sodium 2-chloroethylsulfonate, and evaporate the solvent to obtain tetraceramide ethyl betaine with a content of 97.1 wt%.

[0036] Tetraceramide ethyl betaine and CaCl 2 The oil displacement composition is mixed according to the mass ratio of 1:5, and the oil displacement composition and water are mixed uniformly according to the mass ratio of 3:100, and the size of the micelles formed at 25°C is measured ...

Embodiment 3

[0040] Put 7,15-eicosenoic acid and N,N-dimethyl-1,2-ethylenediamine into the reaction kettle at a molar ratio of 1:2, stir at 170°C for 20 hours, and then vacuumize with an oil pump at 165°C The unreacted N,N-dimethyl-1,2-ethylenediamine was removed, and the content of triacylenamide ethylenediamine was determined to be 99.0wt% by liquid chromatography. Add sodium chloromethanesulfonate to the above system according to the molar ratio of 7,15-eicosenoic acid to sodium chloromethanesulfonate at 1:1.5, and react with 95°C for 3 hours. After the reaction, wash with absolute ethanol to remove The unreacted sodium chloromethanesulfonate was evaporated to remove the solvent to obtain triacylamidoethyl betaine with a content of 97.3wt%.

[0041] triacylamide ethyl betaine and NaHCO 3 The oil displacement composition is mixed according to the mass ratio of 1:2, and the oil displacement composition and water are mixed uniformly according to the mass ratio of 0.55:100, and the size of...

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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 invention relates to an oil displacement composition for low permeability reservoirs and a preparation method thereof. Background technique [0002] Most of the main oilfields on land in my country have entered the middle and late stage of development, and the water content and oilfield production degree are getting higher and higher. Under this situation, it is imminent to produce and develop low-permeability reservoirs well. Due to the ubiquitous characteristics of small pore throats, non-Darcy flow and high start-up pressure in low-permeability reservoirs, the surface molecular force and capillary force act strongly, and the liquid can only flow 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, i...

Claims

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Application Information

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