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Lyotropic liquid crystal flooding system, as well as preparation method and use thereof

A lyotropic liquid crystal system technology, applied in the field of surfactant lyotropic liquid crystal system and its preparation, can solve the problems of no lyotropic liquid crystal oil displacement system, increase the viscosity of the oil displacement system, and decrease the oil displacement efficiency, and achieve Easy to implement, good oil displacement effect, low cost effect

Inactive Publication Date: 2009-07-08
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The main problem of ASP flooding is that due to the large difference in the molecular weight of the three components of the system - alkali, surfactant and polymer, when it migrates in the capillary channel of the oil layer, chromatographic separation occurs, If the function of reducing the interfacial tension and increasing the viscosity of the oil displacement system is separated, the oil displacement efficiency of the system will be greatly reduced
So far, there is no report on the application of lyotropic liquid crystal flooding system in the field of oil recovery technology

Method used

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  • Lyotropic liquid crystal flooding system, as well as preparation method and use thereof
  • Lyotropic liquid crystal flooding system, as well as preparation method and use thereof
  • Lyotropic liquid crystal flooding system, as well as preparation method and use thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Embodiment 1, taking sodium petroleum sulfonate / n-pentanol / decane / brine system as an example, preparation of lyotropic liquid crystal flooding system

[0040] (1) Method for determining the region of lyotropic liquid crystal in the ternary phase diagram

[0041] In the regular triangle coordinate diagram, its three sides are equally divided into 10 equal parts, and its three vertices are respectively salt water (0.5%-5% sodium chloride), which is placed in the lower left corner; petroleum sodium sulfonate+60% decane ( bottom right corner); n-pentanol + 60% decane (top corner). First, on the sideline (n-pentanol-sodium petroleum sulfonate) on the sideline of the top corner of the salt water, take points from top to bottom (respectively table No. 1, 2, 3...9 samples), calculate each according to the leverage rule Composition of sample points. Generally, the mass of each sample point is 1 gram, and sodium petroleum sulfonate, n-pentanol, and decane are weighed in sequence ...

Embodiment 2

[0052] Example 2: Sodium oleate lyotropic liquid crystal flooding system

[0053] Detailed preparation and oil displacement experiment method are with embodiment 1, and difference is:

[0054] (1) The formula of sodium oleate lyotropic liquid crystal flooding system: 29.5wt% sodium oleate+26.3wt% oleic acid+44.2wt% (3.57%wt sodium chloride) aqueous solution, obtain texture photo under polarizing microscope, measure It is lamellar liquid crystal;

[0055] (2) Indoor simulated oil displacement experiment:

[0056] a. Crude oil and formation parameters: Crude oil from the No. 5 Oil Production Plant of Zhongyuan Oilfield, density 0.834g / cm 3 ; Crude oil viscosity 28.2mPa s (60 ℃); Formation permeability: 0.72μm 2 ; Formation temperature: 75°C.

[0057] b. Basic data of artificial core: experimental temperature: 75°C; gas permeability: 0.76μm 2 ;

[0058] Pore ​​volume: 40.2cm 3 ; Saturated oil volume: 28.9cm 3 .

[0059] c. Experimental results: water flooding recovery: 6...

Embodiment 3

[0060] Example 3: AEO-9 lyotropic liquid crystal flooding system

[0061] (1) The formula of AEO-9 lyotropic liquid crystal: 30.5% AEO-9+13.0% n-butanol+56.5% (1.67% sodium chloride) aqueous solution, measured as lamellar liquid crystal;

[0062] (2) Indoor simulated oil displacement experiment

[0063] a. Crude oil and formation parameters: crude oil from Chunliang Oil Production Plant of Shengli Oilfield, density 0.873g / cm 3 , crude oil viscosity 19.3mPa s (60℃), formation permeability 0.185μm 2 , the formation temperature is 70°C.

[0064] b. Basic data of artificial core: experimental temperature: 70°C; gas permeability: 0.20μm 2 ;Pore volume: 40.2cm 3 ; Saturated oil volume: 39.1cm 3 .

[0065] c. Experimental results: the recovery rate of water flooding is 57.43wt% OOIP; the recovery rate of 0.3Vp lamellar liquid crystal chemical flooding is 20.71wt% OOIP.

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Abstract

The invention relates to a lyotropic liquid crystal oil displacing system, a method for preparing the same and application thereof. The lyotropic liquid crystal oil displacing system comprises the following components in portion by mass: 20 to 35 portions of surface active agent, 10 to 30 portions of cosurfactant, and 40 and 65 portions of water phase, wherein the surface active agent is a nonionic surfactant or an anion surfactant, and the cosurfactant is selected from ethanol or organic acid. The lyotropic liquid crystal oil displacing system is applied to the tertiary oil reclamation of crude oil, and has the advantages of simple process, easy implementation and good oil reclaiming rate, wherein the chemical displacement reclaiming efficiency reaches 18 to 25 weight percent OOIP.

Description

technical field [0001] The invention relates to a surfactant lyotropic liquid crystal system and a preparation method thereof, belonging to the technical field of petroleum tertiary oil recovery. Background technique [0002] Petroleum is a non-renewable energy source, the basic raw material for the development of the petrochemical industry, and an important strategic material for the country. The exploitation of oil can be divided into three stages. When the oil field is first developed, the underground energy is used for self-spraying until the natural energy of the oil field is reduced to a certain extent. When the crude oil cannot be self-spraying, it is called primary oil recovery, and its recovery rate is generally about 15%. . In order to increase the recoverable reserves of the oil field, water injection is used to restore the energy of the reservoir for recovery, and the recovery rate reaches 30% to 40%, which is called secondary oil recovery. When the water conte...

Claims

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Application Information

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IPC IPC(8): C09K8/584
Inventor 于丽郑利强马洪超袁杰李干佐肖洪地顾强
Owner SHANDONG UNIV
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