enhance co 2 Chemical Auxiliaries for Oil Recovery in Gas Drive Process

A technology of chemical additives and recovery factor, applied in chemical instruments and methods, mining fluids, earthwork drilling and production, etc., can solve problems such as limited data, insufficient theoretical and practical research on chemical agent structure, and influence on method development, etc., to achieve Improve mutual solubility, improve crude oil rheology and recovery factor, and apply to a wide range of formations

Active Publication Date: 2020-08-21
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, despite the current domestic and foreign research on supercritical CO 2 There are many reports on extraction aids, but few of them have been applied to CO 2 In the study of gas drive process, the available reference materials are limited, and the theoretical and practical research on chemical agent structure is not deep, which affects the further development of this type of method

Method used

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  • enhance co <sub>2</sub> Chemical Auxiliaries for Oil Recovery in Gas Drive Process
  • enhance co <sub>2</sub> Chemical Auxiliaries for Oil Recovery in Gas Drive Process
  • enhance co <sub>2</sub> Chemical Auxiliaries for Oil Recovery in Gas Drive Process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Put 30g of n-hexyl acrylate, 40g of formamide and 30g of xylene in a beaker to prepare a mixing aid, stir and ultrasonically make it fully and evenly mixed, and let it stand for 24 hours before use.

[0034] The chemical auxiliary agent described in this embodiment adopts the injection mode and CO 2 Mix and infuse.

[0035] During the experiment, first use the back pressure valve to control the system pressure to 24MPa, after the system is balanced, inject CO2 at 0.17ml / min 2 At the same time, the auxiliary agent is injected at a rate of 0.001508ml / min. The injection speed corresponds to the mass of the auxiliary agent in the injected gas as CO 2 2% of the mass. During the injection process, the produced oil and gas fluids were measured every 15 minutes, and the phase state and color changes of the fluids were observed through the observation window until the injected gas volume reached 1.2PV and the experiment was stopped.

[0036] Experimental results, such as fig...

Embodiment 2

[0038] Put 30g of n-hexyl acrylate, 40g of formamide and 30g of xylene in a beaker to prepare a mixing aid, stir and ultrasonically make it fully and evenly mixed, and let it stand for 24 hours before use.

[0039] The chemical auxiliary agent described in this embodiment adopts the injection mode and CO 2 Mix and infuse.

[0040] During the experiment, first use the back pressure valve to control the system pressure to 24MPa, after the system is balanced, inject CO2 at 0.17ml / min 2 At the same time, the auxiliary agent is injected at a rate of 0.003016ml / min. The injection speed corresponds to the mass of the auxiliary agent in the injected gas as CO 2 4% of the mass. During the injection process, the produced oil and gas fluids were measured every 15 minutes, and the phase state and color changes of the fluids were observed through the observation window until the injected gas volume was 1.2PV and the experiment was stopped.

[0041] Experimental results such as figure 2...

Embodiment 3

[0043] Put 30g of n-hexyl acrylate, 40g of formamide and 30g of xylene in a beaker to prepare a mixing aid, stir and ultrasonically make it fully and evenly mixed, and let it stand for 24 hours before use.

[0044] The chemical auxiliary agent described in this embodiment adopts the injection mode and CO 2 Mix and infuse.

[0045] During the experiment, first use the back pressure valve to control the system pressure to 24MPa, after the system is balanced, inject CO2 at 0.17ml / min 2 At the same time, the auxiliary agent is injected at a rate of 0.006032ml / min. The injection speed corresponds to the mass of the auxiliary agent in the injected gas as CO 2 8% of the mass. During the injection process, the produced oil and gas fluids were measured every 15 minutes, and the phase state and color changes of the fluids were observed through the observation window until the injected gas volume reached 1.2PV and the experiment was stopped.

[0046] Experimental results, such as fig...

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Abstract

The invention relates to a chemical auxiliary agent for improving the crude oil recovery ratio in a CO2 gas flooding process and belongs to the field of chemical auxiliary agents. The chemical auxiliary agent provided by the invention is prepared from the components in parts by weight: 30 to 50 parts of an acrylate compound, 20 to 40 parts of formamide and 20 to 50 parts of xylene. The chemical auxiliary agent provided by the invention can be injected into a stratum along CO2 through an accompanied injection or prepositioned slug injection manner; after the chemical auxiliary agent is injected, the extraction effect of the CO2 on crude oil can be enhanced, and light-weight components in the crude oil is easily dissolved into the CO2, so that a miscible phase is more easily formed by the front end of the CO2 and the crude oil, and the lowest miscible phase pressure between the CO2 and the crude oil is reduced; the miscible flooding is realized under relatively small pressure and the crude oil recovery is improved. The chemical auxiliary agent provided by the invention has the advantages of simple and convenient injection manner and wide applicable range and has a wide application prospect.

Description

technical field [0001] The invention relates to a chemical auxiliary agent for oil recovery, which belongs to the field of chemical auxiliary agents, in particular to a CO2-enhancing chemical agent capable of extracting light hydrocarbons from crude oil. 2 Chemical additives for oil recovery during gas flooding. Background technique [0002] After the secondary exploitation of the oil reservoir, a large amount of crude oil still remains underground, and the remaining oil exists in the form of small oil droplets isolated in the pores of the reservoir, or exists in the form of a film on the surface of rock particles. The proportion of these residual crude oil to the total crude oil is It can reach 60‐70%, so there is still a lot of room for tertiary oil recovery. In tertiary oil recovery technology, CO injection 2 Enhanced oil recovery technology (CO 2 ‐EOR) has a good application prospect, it not only has a significant effect of enhancing oil recovery, but also utilizes CO...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/594E21B43/22
CPCC09K8/594E21B43/166
Inventor 王端平杨勇李向良郭平张营华祝仰文王其伟盛强仉莉李雪松王军志孙梅李友全张东
Owner CHINA PETROLEUM & CHEM CORP
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