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Ternary complex composition for flooding, suitable for high-temperature and high-salinity reservoir, and application thereof

A ternary composite, high-temperature and high-salt technology, which is applied in the direction of drilling composition, production fluid, wellbore/well components, etc., can solve the problem of unsuitable high-temperature and high-salt reservoirs, ultra-low interfacial tension, and salt tolerance Good emulsification performance, low oil recovery cost and good interface performance

Active Publication Date: 2012-09-26
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The most widely used anionic and nonionic surfactants in tertiary oil recovery are not suitable for high temperature and high salinity reservoirs due to their poor salt and temperature resistance
[0006] The invention patent "An amide group-containing hydroxysultaine and its preparation and application" (application number 2010101304082) discloses a new type of betaine zwitterionic surfactant, which discloses erucic acid amide hydroxysultaine Both binary and ternary systems can achieve ultra-low interfacial tension, but the synthesis of betaine uses erucic acid as a raw material, and its cost is very high, and it is made simply by using erucic acid amide sulfobetaine as a surfactant The interfacial tension of the binary and ternary systems rebounded after 1 hour, and could not reach ultra-low interfacial tension after 105 minutes.

Method used

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  • Ternary complex composition for flooding, suitable for high-temperature and high-salinity reservoir, and application thereof
  • Ternary complex composition for flooding, suitable for high-temperature and high-salinity reservoir, and application thereof
  • Ternary complex composition for flooding, suitable for high-temperature and high-salinity reservoir, and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment 1 interface performance test

[0034] In this example, the compositions for oil displacement using carbooctadecyl dimethyl hydroxysultaine, oleic acid amido hydroxysultaine, and erucic acid amido hydroxysultaine as surfactants and the The interfacial properties of the three-component composite oil flooding composition composed of oleic acid amido hydroxy sultaine and carbadecyl dimethyl hydroxy sultaine have been studied, wherein the above-mentioned oleic acid amide The structures of hydroxysultaine, erucic acid amido sultaine and carbadecyl dimethyl sultaine are shown below respectively (the sultaine of the following examples is the same as that of here same as sulfobetaine):

[0035] Oleamide Hydroxysultaine:

[0036]

[0037] Erucic acid amido sulfobetaine:

[0038]

[0039] Carbooctadecyldimethylhydroxysultaine:

[0040]

[0041] Test method: use formation water with a salinity of 84000mg / L to prepare a solution of carbooctadecyl dimethyl sulfo...

Embodiment 2

[0047] Embodiment 2 Composite surfactant ratio optimization

[0048] In this example, the interfacial properties of the composite surfactant composed of oleic acid amido sulfobetaine and carbadecyl dimethyl sulfobetaine were studied. The above composite surfactants are oleic acid amido sulfobetaine and carbooctadecyl dimethyl sulfobetaine in different mass ratios.

[0049] Test method: Use formation water with a salinity of 84000mg / L, polymers, alkaline substances and composite surfactants to prepare a solution with a composite surfactant concentration of 0.2wt%, and the added polymer adopts star-shaped temperature-resistant and salt-resistant The polymer (the star-shaped temperature-resistant and salt-resistant polymer provided in Example 3 of Chinese Invention Patent Application No. 201010565501.6) has a concentration of 0.2wt%; the alkaline substance is sodium carbonate, and the concentration is 0.2wt%. The interfacial tension of the above solution was tested with a TX500C...

Embodiment 3

[0053] Embodiment 3 Viscosity test

[0054] In this example, the effect of the polymer on the viscosity of the ASP flooding composition was tested.

[0055] Test method: use formation water with a salinity of 84000mg / L to prepare a (ASP) ternary system solution of alkaline substance / polymer / composite surfactant, that is, a composition for ASP flooding, wherein the alkaline substance is Sodium carbonate, concentration is 0.2wt%; Composite surfactant is oleic acid amido sulfobetaine and carbon octadecyl dimethyl sulfobetaine, both mass ratios are 7: 3, composite surface active The concentration of the agent is 0.2wt%. Three kinds of polymers are used to prepare the solutions respectively. The physical and chemical indexes are shown in Table 2, and the concentration is 0.2%. Viscosity test was carried out with American Brookfield LVDVII rotational viscometer, 0# rotor, rotating speed was 6RPM, and test temperature was 95°C. The experimental results are shown in Table 3, and the ...

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Abstract

The invention relates to a ternary complex composition for flooding, suitable for high-temperature and high-salinity reservoir, and application of the composition. The ternary complex composition for flooding is composed of the following components measured by total weight of the ternary complex composition for flooding: 0.05-0.3% of complex surfactants, 0.1-0.25% of polymers, 0.05-2.0% of alkaline matters and the balance of water; wherein the complex surfactants are composed of two kinds of hydroxysulfobetaine with different structures and a mass ratio of 9: 1-4: 6. The invention further provides the application of the ternary complex composition for flooding in tertiary oil recovery. The ternary complex flooding composition of the complex surfactants provided by the invention is featured with high flooding efficiency and low cost of oleamide hydroxysulfobetaine, and is capable of reducing flooding cost.

Description

technical field [0001] The invention relates to a composition for compound composite oil displacement used in tertiary oil recovery, in particular to a composition for triple composite oil displacement and its application in tertiary oil recovery, and belongs to the technical field of petroleum exploitation. Background technique [0002] The main oilfields in my country are mainly composed of continental deposits. Field tests have proved that chemical flooding is one of the leading technologies for enhancing oil recovery in continental deposits. In Daqing Oilfield, polymer flooding has increased the annual production of crude oil by 10 million tons, and the rate of enhanced oil recovery by controlling the fluidity of the polymer to increase the swept volume has reached more than 10%. Through the synergistic effect of controlling mobility and reducing interfacial tension, ASP flooding can increase oil recovery more than polymer flooding. A number of field tests in Daqing Oilf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/588C09K8/584E21B43/22
Inventor 张帆马德胜朱友益罗文利
Owner PETROCHINA CO LTD
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