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A Simulation Method of Special Oil-Water Emulsion Layer in Crude Oil Emulsion

An oil-water emulsification and emulsion technology, applied in chemical instruments and methods, mixing methods, chemical/physical processes, etc., to achieve the effect of flexible adjustment and simple and reliable simulation methods

Active Publication Date: 2019-01-01
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, in order to study the characteristics and causes of special oil-water emulsion layers in oilfields and fundamentally prevent the formation of such special oil-water emulsion layers, a simulation method for special oil-water emulsion layers in oilfields is also urgently needed. There is no report on this aspect so far.

Method used

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  • A Simulation Method of Special Oil-Water Emulsion Layer in Crude Oil Emulsion
  • A Simulation Method of Special Oil-Water Emulsion Layer in Crude Oil Emulsion
  • A Simulation Method of Special Oil-Water Emulsion Layer in Crude Oil Emulsion

Examples

Experimental program
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Effect test

Embodiment 1

[0033] (1) Heat the crude oil from oilfield A in a water bath at 45°C, take 10 mL of crude oil, add 300 mL of n-pentane to dilute, stir at a stirring rate of 200 rpm for 20 min, let it stand for 12 h, and then spin it in a centrifuge for 10 min to separate asphaltenes Add 100mL of acetone to the filtered n-pentane filtrate, stir for 15min at a stirring rate of 200rpm, let stand for 12h and then spin with a centrifuge for 15min to separate the colloidal component.

[0034] (2) Take 3mL of crude oil from oilfield A, 1mL of asphaltene component and 1mL of colloidal component, add it to 100mL of toluene, stir at a stirring rate of 500rpm for 40min, and obtain a toluene mixed solution.

[0035] (3) According to the ionic composition of mineralized water in oilfield A (see Table 1), 5L of oilfield simulated mineralized water was prepared, 2g of hydrophobic association polyacrylamide was added, and heated in a water bath at 50°C to obtain a mass concentration of 400mg / L of polymer s...

Embodiment 2

[0038] (1) Heat the crude oil from oilfield A in a water bath at 45°C, take 10 mL of crude oil, add 500 mL of n-pentane to dilute, stir at a stirring rate of 300 rpm for 10 min, let stand for 12 h, and then spin in a centrifuge for 6 min to separate asphaltenes Add 100mL of acetone to the filtered n-pentane filtrate, stir for 10min at a stirring rate of 300rpm, let stand for 12h and then spin with a centrifuge for 10min to separate the colloidal components.

[0039](2) Take 3mL of crude oil from oilfield A, 2mL of asphaltene component and 1mL of colloidal component, add it to 200mL of toluene, stir at a stirring rate of 800rpm for 30min, and obtain a toluene mixed solution.

[0040] (3) According to the ionic composition of mineralized water in oilfield A (see Table 1), 5L of oilfield simulated mineralized water was prepared, 1g of hydrophobic association polyacrylamide was added, and heated in a water bath at 50°C to obtain a mass concentration of 200mg / L of polymer solution...

Embodiment 3

[0043] (1) Heat the crude oil from oil field B in a water bath at 60°C, take 10 mL of crude oil, add 300 mL of n-pentane for dilution, stir at a stirring rate of 400 rpm for 20 min, let it stand for 16 h, and then spin it in a centrifuge for 15 min to separate asphaltenes Add 100mL of acetone to the filtered n-pentane filtrate, stir for 25min at a stirring rate of 400rpm, let stand for 12h and then spin with a centrifuge for 10min to separate the colloidal components.

[0044] (2) Take 3mL of crude oil from oilfield B, 1mL of asphaltene component and 1mL of colloidal component, add it to 100mL of toluene, stir at a stirring rate of 400rpm for 60min, and obtain a toluene mixed solution.

[0045] (3) According to the ion composition of mineralized water in oilfield B (see Table 2), 5L of oilfield simulated mineralized water was prepared, 2g of high molecular weight linear polyacrylamide was added, and heated in a water bath at 65°C to obtain a mass concentration of 400mg / L poly...

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Abstract

The invention provides a method for simulating a special oil-water emulsion layer in oil field crude oil emulsion. Including: using solvent extraction to separate components of oilfield crude oil to obtain asphaltene and colloidal components; adding oilfield crude oil, asphaltene and colloidal components to toluene, and mixing evenly to obtain a toluene mixed solution; using oilfield simulation Prepare a polymer solution with mineralized water and polymer for oil displacement, and degrade and shear the polymer solution to obtain a simulated output polymer solution; mix the toluene mixed solution with the simulated output polymer solution, and let stand to obtain Simulated crude oil emulsion and special oil-water emulsion. The invention realizes the simulation of the special oil-water emulsion layer with strong emulsification stability by utilizing the interface active components in the oilfield crude oil, ie asphaltene, colloid, and the output polymer. The simulation method provided by the invention is simple and reliable, flexible in adjustment, and provides necessary experimental conditions for solving the problem of the special oil-water emulsion layer in the crude oil emulsion.

Description

technical field [0001] The invention belongs to the field of petroleum, and in particular relates to a method for simulating a special oil-water emulsion layer in oilfield crude oil emulsion. Background technique [0002] Chemical flooding technology has been widely used in major oilfields in my country. While greatly improving oil recovery, it is also more difficult to separate oil and water from produced fluid. Due to the presence of produced polymers (usually polyacrylamide) in the produced fluid, the stability of the produced oil-water emulsion is significantly increased, resulting in a significant increase in the difficulty of demulsification and dehydration of crude oil, and the extracted sewage has a high oil content and oil-water separation difficulty. Especially in the demulsification and dehydration process of crude oil, a very stable special oil-water emulsion layer (also known as the intermediate transition layer) will be formed on the oil-water interface. Mult...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01F3/08B01F3/20B01F23/70
CPCB01F23/4144B01F23/4145B01F23/4105B01F23/707B01F23/70B01F2101/50
Inventor 张健翟磊曾杨王华王旭东王秀军靖波
Owner CHINA NAT OFFSHORE OIL CORP
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