Carbon dioxide response self-thickening intelligent fluid based on supramolecular self-assembly

A technology of supramolecular self-assembly and carbon dioxide, which is applied in the direction of mining fluids, drilling compositions, chemical instruments and methods, etc., can solve problems such as complex processes, permanent damage to reservoirs, poor injection ability, etc., and expand the swept volume , channeling resistance increases, the effect of system viscosity increases

Active Publication Date: 2021-11-09
PETROCHINA CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the existing technical schemes have the following problems: the water-gas alternating injection method is a technology for enhancing recovery by combining two traditional technologies of water flooding and gas flooding, but the completion cost is high, the process is complicated, and it cannot adapt to strong heterogeneity. quality conditions; the gel sealing channeling method is to use high molecular polymer cross-linking as a gel to realize the sealing of local hypertonic strips, but the high molecular weight involved in this method is large (10-15 million), low-permeable oil The injection ability is not good under reservoir conditions, and the formed cross-linked gel will cause permanent damage to the reservoir; the chemical precipitation method uses the

Method used

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  • Carbon dioxide response self-thickening intelligent fluid based on supramolecular self-assembly
  • Carbon dioxide response self-thickening intelligent fluid based on supramolecular self-assembly
  • Carbon dioxide response self-thickening intelligent fluid based on supramolecular self-assembly

Examples

Experimental program
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Effect test

Embodiment 1

[0057] Synthesis of Single-chain Amide Molecules with Tertiary Amine Head Groups and Gemini Surfactants

[0058] The synthetic route in the present embodiment is as follows:

[0059]

[0060] Add 1 mol of oleic acid into the four-necked flask and heat to 170°C; add 1.5 mol of N,N-dimethylpropylenediamine dropwise to the oleic acid through the dropping funnel, and the dropping time is controlled at about 4 hours; Finally, the system was incubated and stirred for 6 hours, and the water generated by the reaction was distilled during the reaction; the acid value of the titration system was titrated with a prepared potassium carbonate standard solution, and when the system acid value was lower than 5 mg / g KOH, the reaction was stopped; then the reaction was decompressed The excess N,N-dimethylpropylenediamine is distilled off to obtain a tertiary amine-containing intermediate (ie, a single-chain amide molecule with a tertiary amine head group).

[0061] The NMR spectrum of a si...

Embodiment 2

[0067] Preparation and Characterization of Carbon Dioxide Responsive Self-Thickening Smart Fluid

[0068] The single-chain amide molecule with the tertiary amine head group obtained in Example 1 and the Gemini surfactant with the quaternary ammonium salt head group obtained therefrom are directly dissolved in water according to a certain concentration and ratio, and the corresponding Carbon dioxide-responsive self-thickening smart fluids.

[0069] In this example, the total mass concentration is controlled at 2%, and the ratio of Gemini surfactant and single-chain amide molecule in the final product responds to the appearance, zero-shear viscosity and structure of the obtained carbon dioxide self-thickening smart fluid as follows image 3 , Pic 4-1 and Figure 4-2 shown. G in the picture x X in represents the mass percentage that Gemini surfactant accounts for the sum of Gemini surfactant and single-chain amide molecule in the system; Present embodiment altogether makes G...

Embodiment 3

[0072] The change test of appearance, shear viscosity and modulus of self-thickening smart fluid with shear rate before and after carbon dioxide injection:

[0073] G in Example 2 70 The sample is fed with carbon dioxide, and the change of system properties before and after feeding is observed.

[0074] Figure 5 It shows the change of appearance and morphology of the sample before and after carbon dioxide is introduced. It can be seen that before carbon dioxide is introduced, the system is a low-viscosity liquid with bluish light. After the introduction of carbon dioxide, the system becomes transparent and can wrap the carbon dioxide bubbles inside it, indicating that the viscosity has increased significantly.

[0075] Figure 6-1 It is the relationship between the shear viscosity of the system and the shear rate before and after the introduction of carbon dioxide. Before the introduction of carbon dioxide, the viscosity of the system is close to that of pure water, and ...

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Abstract

The invention discloses a carbon dioxide response self-thickening intelligent fluid based on supramolecular self-assembly. The carbon dioxide response self-thickening intelligent fluid comprises a Gemini surfactant, a single-chain amide molecule with a tertiary amine head group and water; the Gemini surfactant and the single-chain amide molecule with the tertiary amine head group are self-assembled to form a vesicle structure which is dispersed in water; and the hydrophilic head group is arranged outside, and the hydrophobic tail part is arranged inside. The preparation method of the carbon dioxide response self-thickening intelligent fluid is simple, and the injection viscosity is low. The fluid is converted into gel after encountering carbon dioxide, and the viscosity is greatly increased. The problem that when the recovery ratio is increased through carbon dioxide gas drive of a low-permeability reservoir, gas flows along a local high-permeability channel, and consequently the swept volume is greatly reduced is effectively solved.

Description

technical field [0001] The invention relates to the technical field of oil and gas field development, in particular to a carbon dioxide-responsive self-thickening intelligent fluid based on supramolecular self-assembly and its preparation and application. Background technique [0002] Carbon dioxide flooding is the second largest enhanced oil recovery technology in the world, and it is one of the main methods to enhance the recovery of low-permeability reservoirs. Carbon dioxide flooding enhanced oil recovery technology has been widely valued by countries all over the world due to its advantages such as wide application range, high oil displacement efficiency and low cost. [0003] However, in field applications, gas channeling caused by various factors such as reservoir heterogeneity severely restricts the gas sweep volume, making it difficult for carbon dioxide flooding to achieve the experimental results of indoor oil flooding. [0004] Aiming at the problem of gas chann...

Claims

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Application Information

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IPC IPC(8): C09K8/584C09K8/594
CPCC09K8/584C09K8/594E21B43/164
Inventor 熊春明魏发林杨海洋谢永军邵黎明彭康曾致翚
Owner PETROCHINA CO LTD
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