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Nanoparticle oil-displacing agent and method for improving recovery ratio

A nano-particle and oil-displacing agent technology, which is applied in chemical instruments and methods, production fluids, earth-moving drilling, etc., can solve the problems of ambiguity, inability to play a targeted role, and the lack of improvement of nano-particle oil-displacing agents.

Active Publication Date: 2022-01-04
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the mechanism of enhanced oil recovery by nanoparticle oil displacement agents is not clear at present, and the various designed nanoparticle oil displacement agents have not formed effective enhanced oil recovery schemes for practical applications based on certain specific enhanced displacement capabilities. It cannot play its role in a targeted manner, and it is difficult to obtain stable and reliable performance in the oilfield field

Method used

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  • Nanoparticle oil-displacing agent and method for improving recovery ratio
  • Nanoparticle oil-displacing agent and method for improving recovery ratio
  • Nanoparticle oil-displacing agent and method for improving recovery ratio

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0052] (1) Select the reservoir that is suitable for the oil displacement agent provided by the application to play a role, select a block in Changqing Oilfield for analysis, and obtain 10 rock cores through detection wells; the oilfield reservoir is a sandstone reservoir. The cores in the reservoir show that the organic matter (excluding crude oil) content ranges from 3% to 8%, and the organic matter content is small. Through the Amott wettability test method, the following Amott wettability index is obtained.

[0053] Table 1: Amott wettability index

[0054] Core serial number 1 2 3 4 5 I A

[0055] From the Amott wettability index, it can be seen that most of the sandstone reservoirs are water-wet reservoirs (only one of the 10 cores is weakly oil-wet), and its organic matter content is low, indicating that the reservoir is silica-based. As the main ingredient, silica nano-particle oil displacement agent can be used.

[0056] Determine the suitable na...

Embodiment 2

[0076] This embodiment is the effect test of the enhanced oil recovery of the oil displacement agent that embodiment 1 makes, use the reservoir chip of the same structure as embodiment 1 Changqing Oilfield reservoir condition in embodiment 2, wherein one chip material is The weakly hydrophilic structure is the same as the real situation, and the other control chip material is a neutral environment. The oil displacing agent prepared in Example 1 and deionized water were used for comparison in the two groups of experimental structures.

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Abstract

The invention provides a nanoparticle oil-displacing agent and a method for improving recovery ratio. A specific oil-displacing agent is prepared by selecting a reservoir environment suitable for nano-particles to play a role, and during displacement, nanoparticle injection, crude oil release promotion and displacement of released crude oil are realized by adopting an injection-pressure relief-reinjection mode, so that the purpose of improving the recovery ratio is achieved. Nanoparticles in the oil-displacing agent are adsorbed on a liquid-liquid surface to reduce interfacial tension, and are adsorbed on a rough solid surface to form secondary roughness to realize extension and growth of a water film, and crude oil is released by utilizing surface energy difference in a displacement process.

Description

technical field [0001] This article involves but is not limited to new energy and high-efficiency energy-saving fields, especially involves but is not limited to nano-particle oil displacement agents and methods for applying them to enhance oil recovery. Background technique [0002] At present, China's crude oil is highly dependent on foreign countries. The exploration and development of oil and gas resources are related to the development of the national economy and the stable operation of society. Improving oil recovery through new methods and technologies is an important means to increase oil and gas production and ensure national energy security. Among them, chemical flooding by adding various chemical reagents into the displacement fluid is a widely used means of enhancing oil recovery. However, there are many problems in the traditional chemical flooding method, such as environmental pollution, large consumption, and serious ineffective loss in the formation. [0003...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/58E21B43/22
CPCC09K8/58E21B43/16
Inventor 王沫然雷文海鲁旭康刘洋
Owner TSINGHUA UNIV