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Viscoelastic nano-magnetic fluid for improving crude oil recovery ratio of tight reservoir, and preparation method thereof

A technology of nano-magnetic fluid and tight reservoir, which is applied in the direction of nano-technology, mining fluid, and nano-technology for materials and surface science, can solve the problems of crude oil nano-magnetic fluid and preparation technology without tight reservoir, and achieve improvement The effect of oil recovery, strong stability and strong lipophilicity

Active Publication Date: 2020-02-11
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, there is no nano-magnetic fluid and its preparation technology specially used to enhance oil recovery in tight reservoirs

Method used

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  • Viscoelastic nano-magnetic fluid for improving crude oil recovery ratio of tight reservoir, and preparation method thereof
  • Viscoelastic nano-magnetic fluid for improving crude oil recovery ratio of tight reservoir, and preparation method thereof
  • Viscoelastic nano-magnetic fluid for improving crude oil recovery ratio of tight reservoir, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] A preparation method of viscoelastic nano magnetic fluid for improving oil recovery in tight reservoirs, including the following steps:

[0047] (1) Put 16.2g FeCl 3 And 13.9g FeSO 4 ·7H 2 O was dissolved in 200 mL of deionized water and stirred evenly to obtain a mixed solution. The mixed solution was heated to 60°C, and 0.1 mol / L NaOH solution was added while stirring to adjust the pH of the system to 10, and then reacted for 40 minutes for precipitation to obtain Fe 3 O 4 Particles

[0048] (2) Dissolve 4.56 g of sodium oleate in 100 mL of deionized water to obtain a sodium oleate solution, and add the sodium oleate solution to step (1) to obtain Fe 3 O 4 The granules are aged for 2 hours under the conditions of a mechanical stirring rate of 500r / min and a aging temperature of 95°C, and they are naturally cooled to room temperature. The solid particles are separated, washed with deionized water 5 times, and dried at 75°C in vacuum for 4 hours. Obtain Fe modified by sodium ...

Embodiment 2

[0053] A preparation method of viscoelastic nano-magnetic fluid used to improve the oil recovery of tight reservoirs is as described in Example 1, except that in step (3), 1.49g is chlorinated at a temperature of 60°C Sodium and 1.52g sodium oleate were dissolved in 100mL deionized water, stirred for 30min, and naturally cooled to room temperature to obtain a viscoelastic surfactant solution; take 3g of the sodium oleate modified Fe obtained in step (2) 3 O 4 The particles were added to the viscoelastic surfactant solution and stirred at a rate of 400r / min for 60 minutes to obtain a viscoelastic nano magnetic fluid.

[0054] The lipophilicity and magnetic response test results of the viscoelastic nanomagnetic fluid prepared in this embodiment are as follows Figure 5 As shown, a, viscoelastic nano magnetic fluid, b, viscoelastic nano magnetic fluid is added with kerosene (upper layer), c, nano magnetic particles enter the oil phase (upper layer), d, the oil phase containing nano ma...

Embodiment 3

[0056] A preparation method of viscoelastic nano-magnetic fluid for improving oil recovery in tight reservoirs is as described in Example 1, except that in step (3), at a temperature of 60°C, 3.18g of sodium carbonate And 1.83 g of sodium oleate were dissolved in 100 mL of deionized water, stirred for 30 minutes, and naturally cooled to room temperature to obtain a viscoelastic surfactant solution; take 2 g of the sodium oleate modified Fe obtained in step (2) 3 O 4 The particles were added to the viscoelastic surfactant solution and stirred at a rate of 400r / min for 60 minutes to obtain a viscoelastic nano magnetic fluid.

[0057] The transmission electron microscope (TEM) photo of the viscoelastic nanomagnetic fluid prepared in this example is as follows Image 6 Shown from Image 6 It can be seen that the size of the nanoparticles is about 20nm, the shape is consistent, and the dispersion is good.

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Abstract

The invention provides a viscoelastic nano-magnetic fluid for improving the crude oil recovery ratio of a tight reservoir, and a preparation method thereof. The viscoelastic nano-magnetic fluid is composed of surface modifier-modified Fe3O4 particles used as nano-magnetic particles and a viscoelastic surfactant solution used as a carrier liquid; the mass concentration of the surface modifier-modified Fe3O4 particles is 0.5-10 wt.%; and the viscoelastic surfactant solution is prepared by dissolving an anionic surfactant and a counter ion agent in water. The invention further provides the preparation method of the viscoelastic nano-magnetic fluid. The nano-magnetic fluid has the advantages of viscoelasticity, good stability, narrow particle size distribution, strong lipophilicity of the magnetic particles, strong magnetic response, cheap preparation raw materials and simple preparation process, is suitable for industrial production, and can be used in the field of tight reservoir crude oil exploitation to improve the crude oil recovery efficiency.

Description

Technical field [0001] The invention relates to a viscoelastic nano magnetic fluid used for improving the oil recovery rate of tight reservoirs and a preparation method thereof, and belongs to the technical field of material preparation. Background technique [0002] In recent years, conventional oil and gas production has been unable to meet the continuous growth of demand for oil and gas resources in world development. Unconventional oil and gas resources have become the focus of global attention. The successful exploration and development of tight oil and gas has injected new vitality into the world’s energy resources. China has changed the world’s traditional energy pattern. China's tight oil resources are very rich, and they are China's actual oil replacement resources in the future. Due to the low permeability of tight reservoirs (underground overburden permeability is less than 0.1mD) and porosity (generally less than 10%), it is difficult to construct an effective displa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/584C01G49/08B82Y40/00B82Y30/00E21B43/22H01F1/44
CPCC09K8/584C01G49/08B82Y40/00B82Y30/00E21B43/16H01F1/445C09K2208/10C09K2208/30C01P2002/82C01P2004/04
Inventor 罗明良司晓冬贾晓涵战永平李钦朋罗帅
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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