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A screening method for surfactants in poly-surface binary flooding

A technique of surfactant and binary flooding, which is applied in the fields of surface tension analysis, surface/boundary effects, chemical instruments and methods, etc., which can solve the problems of lack of system, one-sided screening and evaluation of surfactants, and inability to achieve good oil displacement effect and other issues, to achieve the effect of enhancing recovery

Active Publication Date: 2018-09-04
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In poly-surface binary flooding, the screening results of surfactants will directly affect the effect of poly-surface binary flooding, and will also have a major impact on field applications. Suitable surfactants can greatly improve the performance of poly-surface binary flooding. The recovery factor of oil flooding; and the current screening and evaluation of surfactants in poly-surface binary flooding are relatively one-sided, and there is no systematic screening method; when the prior art screens surfactants, the main considerations are It is the interfacial tension performance of surfactants, and the factors that affect the oil displacement performance of surfactants have not been considered comprehensively, and the weights of various factors have not been weighed, which is lack of system; The surfactants screened according to the existing methods, in actual Can not play a very good oil displacement effect in the application process

Method used

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  • A screening method for surfactants in poly-surface binary flooding
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Experimental program
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Effect test

Embodiment 1

[0087] The present embodiment provides a kind of screening method of surfactant in poly-surface binary flooding, and this method is mainly carried out for Xinjiang Oilfield, and it comprises the following steps:

[0088] 1) Prepare two different poly-surface binary flooding solutions, and their composition is shown in Table 1. The surfactant in Table 1 is produced by Jiangsu Haian Petrochemical Plant, and the polymer is produced by Beijing Hengju Chemical Group Co., Ltd. Production;

[0089] Table 1 Composition of poly-surface binary flooding solution

[0090]

Solution 1

Solution 2

Surfactant

SP-1207 (mass fraction is 0.3%)

ZHK-3 (mass fraction is 0.3%)

polymer

HPAM (concentration is 1200mg / L)

HPAM (concentration is 1200mg / L)

[0091] 2) Test the interfacial tension, wettability, emulsification performance, oil washing ability, thermal stability and adsorption stability of the two different poly-surface binary flooding solut...

Embodiment 2

[0119] In this embodiment, a microscopic visual model is used to test the oil displacement effect of two different surfactants in Example 1, and the test steps are as follows:

[0120] 1) Microscopic visual model: use photolithography to copy the pore network on the thin slice of the core casting, and make a microscopic simulation through the steps of plate making, glue coating, photoimaging, chemical etching, sintering molding and wettability treatment Transparent pore model. The model size is 62mm×62mm×3.0mm, the effective size on the plane is 45mm×32mm, and the model pore diameter is 0.1-100μm. The model is a quarter of the five-point well pattern, and a small hole is drilled on the diagonal as the injection well and the production well;

[0121] 2) Take crude oil (858 g / L) from Qizhong District of Xinjiang Karamay Oilfield and mix aviation kerosene to prepare simulated oil with a viscosity of 7.8mPa·s at room temperature; take the formation water in Qizhong District of Xi...

Embodiment 3

[0133] In this embodiment, a flat visual model is used to test the oil displacement effect of two different surfactants in Example 1, and the test steps are as follows:

[0134] 1) Plane sand inclusion model:

[0135] ①Model material: It is made of two transparent glass plates cemented together;

[0136] ②Dimensions of the model experiment area (except the corner part): the thickness is about 2mm, and the length and width are 18cm×18cm;

[0137] ③Simulated oil layer: Fill quartz sand with different particle sizes to simulate oil layers with different permeability in the oil field;

[0138] ④ Simulate oil wells and water wells: drill holes on the model as injection and production ends;

[0139] ⑤ In order to avoid the influence of external tracer on the performance of the binary system and the oil-water interface, the color difference is used to investigate the extent of water flooding and binary flooding to increase the swept volume;

[0140] 2) Experimental operation steps...

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Abstract

The invention provides a method for screening a surfactant in polymer / surfactant binary displacement of reservoir oil. The method comprises the steps of: preparing different polymer / surfactant binary displacement of reservoir oil solutions, which have different types of surfactants and the same other contents; testing the comprehensive performances of the different polymer / surfactant binary displacement of reservoir oil solutions, wherein the comprehensive performance test comprises items of interfacial tension, wettability, emulsifying properties, ability to wash oil, thermal stability and adsorption stability; and according to the measured results, selecting the surfactants satisfying the most test item requirements in the comprehensive performance test and using the surfactants in the polymer / surfactant binary displacement of reservoir oil. From the aspect of flooding functions of the surfactants, the technical scheme screens the surfactants, for the first time systematically elaborates the screening method of the polymer / surfactant binary displacement of reservoir oil, and provides basis for screening suitable surfactants to oilfield.

Description

technical field [0001] The invention relates to a screening method for surfactants, in particular to a screening method for surfactants in polysurface binary flooding, and belongs to the field of oil exploitation. Background technique [0002] In the development of oil and gas fields, polymer / surfactant binary flooding (also known as polysurface binary flooding) is a tertiary oil recovery technology with great development potential, which utilizes the synergistic effect of polymers and surfactants, significantly The oil displacement effect is improved, and the oil recovery rate is increased. The specific principle is: the surface active agent reduces the interfacial tension of oil and water, changes the wettability, reduces the adhesion work, and makes the residual oil Emulsification, stripping, threading and easy start-up; and the formed emulsion further increases the viscosity of the displacement fluid, thereby enabling the start-up of residual oil in areas where water flo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N13/00G01N13/02C09K8/584
CPCC09K8/584G01N13/00G01N13/02G01N2013/0208
Inventor 罗莉涛刘卫东魏云云左罗苟斐斐姜伟张春华
Owner PETROCHINA CO LTD