Unlock instant, AI-driven research and patent intelligence for your innovation.

Bio-based nanofluids and their applications in enhanced oil recovery in low-permeability reservoirs

A nano-fluid, bio-based technology, applied in the fields of mining fluids, earthwork drilling, drilling compositions, etc., can solve the problems of limited research progress on biosurfactants and nanoparticles, and achieve a simple and easy-to-operate preparation method. Application prospects, small amount of effect

Active Publication Date: 2021-01-08
CHINA UNIV OF PETROLEUM (BEIJING)
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] To sum up, in the prior art, some progress has been made in the research of nanoparticles and chemical surfactants in the petroleum field, but the research progress of biosurfactants and nanoparticles in this field is very limited.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Bio-based nanofluids and their applications in enhanced oil recovery in low-permeability reservoirs
  • Bio-based nanofluids and their applications in enhanced oil recovery in low-permeability reservoirs
  • Bio-based nanofluids and their applications in enhanced oil recovery in low-permeability reservoirs

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment 1, the stability analysis of bio-based nanofluid of the present invention

[0031] In the present invention, the stability of the bio-based nanofluid itself determines the application prospect. Among them, the concentration of nanoparticles and the concentration of biosurfactant have the greatest influence on the stability of the whole system.

[0032] 1. Macroscopic observation of the stability of nanofluids

[0033]In the present invention, the specific method of macroscopic direct observation is: dissolving NaCl in deionized water, preparing 30000mg / L simulated formation water, dissolving rhamnolipids of different qualities in simulated formation water, the mass concentrations are respectively 15,30 , 60mg / L, and blank control, each 300mL. Weighing different masses of SiO 2 Nanoparticles: 50, 100, 500 mg, added to 100 mL of biosurfactant solution, and subjected to ultrasonic vibration treatment. Under the condition of ultrasonic frequency 400W, the int...

Embodiment 2

[0040] Embodiment 2, the influence of bio-based nanofluid on the wettability of rock surface

[0041] The change of wettability is one of the important mechanisms of enhanced oil recovery. The pore throats of low-permeability reservoirs are small in size and the formation structure is very complex, which leads to poor crude oil fluidity. A large amount of crude oil is adsorbed on the pore walls and narrow pore throats, so the wettability of rock formations belongs to oil wetness. Oil-wet formations will limit the swept volume of displacement water, and oil phase permeability will also decrease. Therefore, converting oil-wet formations into water-wet formations is one of the important directions for enhancing oil recovery. Nanoparticles are small in size, high in specific surface area, and high in surface energy, so they are easily adsorbed on solid surfaces. The SiO used in this example 2 The nanoparticles are not modified, and the surface is covered with hydroxyl groups, sh...

Embodiment 3

[0045] Example 3, the influence of bio-based nanofluids on the internal wettability of rocks

[0046] In the present invention, in addition to changing the wettability of the rock surface, the bio-based nanofluid also has a very obvious effect on the internal wettability, which can be verified by self-osmotic water absorption experiments.

[0047] The wettability of solid rock determines the flow state of the fluid in the rock pores. The automatic water absorption of core slices can change before and after nanofluid treatment, which indicates that the permeability inside the rock has changed. Rinse and dry the rock cores before and after nanofluid treatment, and then hang and immerse them in deionized water. The deionized water will be automatically sucked into the pores of the rock by capillary action. The mass change of the core slice is measured until no more core slice sample is saturated, no more water is absorbed, and the sample mass remains constant at this time. If th...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
particle sizeaaaaaaaaaa
particle sizeaaaaaaaaaa
contact angleaaaaaaaaaa
Login to View More

Abstract

A bio-based nanofluid and an application thereof in increasing the recovery rate of a low-permeability oil reservoir, specifically provided is a bio-based nanofluid composition comprising a rhamnolipid biosurfactant and SiO2 nanoparticles, the mass ratio of the SiO2 nanoparticles to the rhamnolipid biosurfactant being 50-500: 1-5. In an application, the bio-based nanofluid composition is formulated into a fluid in which the mass fraction of the nanoparticles is 500 mg / L-1000 mg / L, and the mass fraction of the rhamnolipid is 10 mg / L-50 mg / L. The bio-based nanofluid may increase the oil recovery rate of a low-permeability oil reservoir, and reduce injection pressure.

Description

technical field [0001] The present invention is about a brand-new bio-based nanofluid and its application in enhancing oil recovery, in particular about a SiO 2 The bio-based nanofluid prepared by nanoparticles and rhamnolipid biosurfactant can improve the crude oil production in a more environmentally friendly and efficient way for dense and low-permeability reservoirs that are difficult to recover, and belongs to the technical field of oilfield chemicals. Background technique [0002] As an efficient energy source and chemical raw material, petroleum plays an irreplaceable role in the modern industrial field. With the continuous development of the petroleum industry and the continuous deepening of exploitation, many high-quality oil reservoirs have experienced the phenomenon of oil exploitation depletion. In this context, dense and low-permeability reservoirs will become the key direction of my country's petroleum industry. Due to the characteristics of low-permeability r...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/58C09K8/584E21B43/22
CPCC09K8/58C09K8/584C09K2208/10E21B43/16
Inventor 张志勇张忠智王迪罗一菁孙珊珊侯吉瑞刘同敬
Owner CHINA UNIV OF PETROLEUM (BEIJING)