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Biological shearing agent for improving shale oil layer oil extraction efficiency and preparation method and application thereof

A biological and oil layer technology, applied in the chemical field, can solve the problems of reduced surfactant activity, low permeability of rock formations, difficulty in coping with permeability, etc., and achieve the effect of good binding force and low viscosity of injection fluid

Active Publication Date: 2021-11-26
海域泰和山东能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the crude oil is strongly adsorbed on the rock surface, or the permeability of the rock formation is low, it is difficult for the existing oil recovery technology to effectively increase the recovery rate.
[0004] Disperse crude oil into water by using polymer or surfactant solutions with low interfacial tension, high viscosity and high emulsification efficiency, because the surfactant micelles are usually large in size and produce great resistance in small rock crevices. Difficult to extract crude oil and limited ability to enhance oil recovery, especially in rock formations with low permeability
[0005] In addition, the activity of surfactants is significantly reduced under the influence of high temperature, so it cannot be applied to shale oil reservoirs with higher temperatures

Method used

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  • Biological shearing agent for improving shale oil layer oil extraction efficiency and preparation method and application thereof
  • Biological shearing agent for improving shale oil layer oil extraction efficiency and preparation method and application thereof
  • Biological shearing agent for improving shale oil layer oil extraction efficiency and preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] Such as figure 1 Shown, a kind of biological shearing agent preparation method that improves oil recovery efficiency of shale oil layer, comprises the following steps:

[0062] S1. Biological shearing enzyme extraction: Grind and pulverize plant raw materials to obtain plant powder, mix plant powder with additives, pH regulator and water at a mass ratio of 1:0.1~0.25:0.1~0.5:15~30, and place in a closed After boiling in the container for 1-24 hours, filter out the insoluble matter and absorb impurities, then add a co-solvent with a mass fraction of 5-20%, dissolve and dry to obtain a biological shearing enzyme powder;

[0063] Plant raw materials include one or more of the following and their products or extracts: golden buckwheat, catechin, persimmon stalk, grape seed, green tea, pomegranate peel and gallnut;

[0064] The auxiliary agent is sulfite;

[0065] S2. Preparation of bio-shearing agent: mix bio-shearing enzyme powder with stabilizer and surfactant in a mass...

Embodiment 2

[0069] Such as figure 1 Shown, a kind of biological shearing agent preparation method that improves oil recovery efficiency of shale oil layer, comprises the following steps:

[0070] S1. Biological shearing enzyme extraction: Grind and pulverize plant raw materials to obtain plant powder, mix plant powder with additives, pH regulator and water at a mass ratio of 1:0.1~0.25:0.1~0.5:15~30, and place in a closed After boiling in a container for 1-24 hours, filter to remove insoluble matter, add activated carbon to the solution while it is hot to absorb impurities, cool and filter, then add a co-solvent with a mass fraction of 5-20%, and dry the filtrate under reduced pressure to prepare a powder. Biological shearing enzyme powder;

[0071] Plant raw materials include one or more of the following and their products or extracts: golden buckwheat, catechin, persimmon stalk, grape seed, green tea, pomegranate peel, gall, emblica, lichen, salvia, banyan leaf, astragalus, and nightsh...

Embodiment 3

[0084] [1] Formation status: Formation temperature 95°C, rock type siltstone (quartz sand), porosity ~ 2%;

[0085] [2] Plant material: golden buckwheat flour + catechin powder (2:1);

[0086] [3] Processing method:

[0087] After the plant material is pulverized, add a pH regulator, sodium sulfide (10% added), ammonium chloride (5%), sodium sulfite (12%) and 2000% water;

[0088] Boil under pressure at 110°C for 20 hours, filter to remove insoluble matter, add activated carbon and continue to boil for 1 hour, then filter to obtain the solution;

[0089] Add co-solvent glucose to the solution, the addition amount is 15%;

[0090] Dry the solution under reduced pressure to make a dry powder, and mix it with sodium dithionite and disodium EDTA (5%, 12%) to obtain a biological shearing agent;

[0091] [4] How to use:

[0092] The biological shearing agent is dissolved in tap water according to 0.2% mass ratio, and 0.01% butanol is added at the same time, and injected into the...

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Abstract

The invention provides a biological shearing agent for improving shale oil layer oil extraction efficiency and a preparation method and application thereof. Plant raw materials are ground and smashed and then mixed with auxiliaries, a pH regulator and water, a cosolvent is added for dissolution, and then drying is conducted to obtain biological shearing enzyme powder; and the biological shearing enzyme powder is mixed with a stabilizer and a surfactant to obtain the biological shearing agent. Inspired by a marine organism fouling principle, natural polyphenol from a plant source and sulfite are subjected to addition to obtain a sulfonated product on a benzene ring, and an artificially simulated biological shearing enzyme is obtained, so that the rock surface is modified into an underwater super-oleophobic state, crude oil is separated, and as the viscosity of the biological shearing enzyme is very low, the biological shearing enzyme has good permeability even in small rock cracks and especially can effectively act in various tiny rock cracks to peel off crude oil in the rock cracks, and can be suitable for high temperature of shale layers.

Description

technical field [0001] The invention relates to the field of chemical technology, in particular to a biological shearing agent for improving the oil recovery efficiency of shale oil layers, a preparation method and application thereof. Background technique [0002] The crude oil in shale oil is in the state of inclusion in the rock gaps, and the gaps between the rocks are extremely small, and the formation temperature is high, the crude oil content is low, and the interaction with the rocks is strong, which has always been a tough problem in the field of oil production. . [0003] In traditional oil recovery technology, it is necessary to use surfactants or polymer viscosifiers to reduce the oil / water interfacial tension to emulsify crude oil into water. However, if the crude oil is strongly adsorbed on the rock surface, or the permeability of the rock formation is low, it is difficult for the existing oil recovery technology to effectively increase the recovery rate. [0...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/58C09K8/86C09K8/60
CPCC09K8/58C09K8/86C09K8/602
Inventor 江雷郝德昭田野
Owner 海域泰和山东能源科技有限公司
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