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A method for rapid construction of ultra-low interfacial tension between biosurfactant and crude oil

A biological surface and interfacial tension technology, applied in chemical instruments and methods, drilling compositions, instruments, etc., can solve problems such as difficult to study complex structure recombination behavior, difficult to guide construction work, and large differences in crude oil properties. Achieve the effect of reducing indoor screening time, high accuracy and simple method

Active Publication Date: 2020-06-19
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Zhu Pengfei et al. reported "Mesoscopic simulation of interfacial behavior and properties of biosurfactant rhamnolipid and its complex system" (Acta Chem. Sinica 2011,69(20):2420-2426) using the method of mesoscopic simulation of dissipative particle dynamics Research on the combination mechanism of biosurfactants and chemical surfactants, and give the behavioral characteristics of rhamnolipids with different structures and their combination rules with commonly used synthetic chemical surfactants, but only the relative structures can be used in the simulation. For simple molecules, it is difficult to study the recombination behavior between macromolecules with complex structures, so it does not have extensive promotional significance
[0004] The traditional ultra-low interfacial tension construction method has a huge workload and extremely low efficiency, and there is a lot of blindness
In addition, the properties of crude oil in different blocks are quite different, making the existing research results difficult to guide the subsequent construction work, making the construction of biosurfactant ultra-low interfacial tension system a repetitive and arduous task

Method used

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  • A method for rapid construction of ultra-low interfacial tension between biosurfactant and crude oil
  • A method for rapid construction of ultra-low interfacial tension between biosurfactant and crude oil
  • A method for rapid construction of ultra-low interfacial tension between biosurfactant and crude oil

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] In a block H of Dongxin Oil Production Plant, the reservoir temperature is 75°C and the permeability is 650×10 -3 μm 2, the ground viscosity of crude oil is 8761mPa·s, the salinity of produced water is 55920mg / L, Ca 2+ / Mg 2+ The ion content is 3278mg / L, and the recoverable reserves are 2.5×10 4 t, the average water cut of oil wells is 95.2%. The main development contradictions of this block at this stage are: high viscosity of crude oil, active edge water, large difference in oil-water mobility ratio, and low water flooding efficiency. Aiming at the fact that the water content of the oil wells in this block increases and the output decreases, the method of the present invention is used to construct a biosurfactant composite oil displacement system to reduce the interfacial tension between the crude oil and the displacement fluid, and reduce the oil-water mobility ratio, thereby effectively reducing Comprehensive water cut of oil reservoir, enhanced oil recovery. T...

Embodiment 2

[0072] In a block G of Binnan Oil Production Plant, the reservoir temperature is 82°C and the permeability is 900×10 -3 μm 2 , the ground viscosity of crude oil is 3456mPa·s, the salinity of produced water is 10538mg / L, and the recoverable reserves are 7.5×10 4 t, the average water cut of oil wells is 96.5%. The main contradictions in the development of this block at this stage are: high viscosity of crude oil, large difference in oil-water mobility ratio, and low water flooding efficiency. Aiming at the fact that the water content of the oil wells in this block increases and the output decreases, the method of the present invention is used to construct a biosurfactant composite oil displacement system to reduce the interfacial tension between the crude oil and the displacement fluid, and reduce the oil-water mobility ratio, thereby effectively reducing Comprehensive water cut of oil reservoir, enhanced oil recovery. The specific construction steps are as follows:

[0073]...

Embodiment 3

[0095] In a block L of Hekou Oil Production Plant, the reservoir temperature is 80°C and the permeability is 1200×10 -3 μm 2 , the surface viscosity of crude oil is 8756mPa·s, the salinity of produced water is 9794mg / L, and the recoverable reserves are 4.0×10 4 t, the average water cut of oil wells is 97.2%. The main development contradictions of this block at this stage are: high reservoir permeability, large difference in oil-water mobility ratio, and low water flooding efficiency. Aiming at the fact that the water content of the oil wells in this block increases and the output decreases, the method of the present invention is used to construct a biosurfactant composite oil displacement system to reduce the interfacial tension between the crude oil and the displacement fluid, and reduce the oil-water mobility ratio, thereby effectively reducing Comprehensive water cut of oil reservoir, enhanced oil recovery. The specific construction steps are as follows:

[0096] 1. On-...

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Abstract

The invention specifically relates to a method for rapid construction of ultra-low interfacial tension between a biosurfactant and crude oil, belonging to the technical field of tertiary oil recovery.The construction method comprises the following concrete steps: on-site sampling of a test block and oil-water separation; determination of the equivalent alkane carbon number of crude oil in the test block; selection of a biosurfactant; construction of an ultra-low interfacial tension compounded system; and performance evaluation of the compounded system. The method of the invention can quicklyconstruct the biosurfactant compounded system for crude oil in different blocks and realizes ultra-low interfacial tension. The construction method of the invention has the advantages of easiness, rapidness, high efficiency, reduction in the blindness of testing and improvement of work efficiency; the compounded system constructed by the method has the characteristics of low interfacial tension and strong oil displacement performance, and has interfacial tension of 10<-3> mN / m or below and indoor physical model experiment enhanced oil recovery rate of 25% or more.

Description

technical field [0001] The invention belongs to the technical field of tertiary oil recovery, and in particular relates to a method for quickly constructing an ultra-low interfacial tension between a biosurfactant and crude oil. Background technique [0002] Enhanced oil recovery is the main problem faced by oilfields, and rational development of high-temperature and high-salt water flooding reservoirs is an important means to achieve stable production and increased oil production. The successful application of chemical agents in ordinary oil reservoirs, for high-temperature and high-salt water flooding reservoirs, the structure and performance of chemical agents are easy to change, so that the existing chemical surfactants cannot achieve the desired effect. Biosurfactants are produced by microbial fermentation and mainly include glycolipids and lipopeptides. Biosurfactants have functional groups that are difficult to synthesize by chemical methods, and have the advantages ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N33/00C09K8/584
CPCC09K8/584G01N33/00
Inventor 丁明山王静林军章徐登霆冯云段传慧宋欣胡婧孙刚正徐闯王新汪刚跃岳胜辉
Owner CHINA PETROLEUM & CHEM CORP
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