Binary alkali-free complex composition for flooding, suitable for high-temperature and high-salinity reservoir, and application thereof

An alkali-free composite flooding, high-temperature and high-salt technology, which is applied to drilling compositions, production fluids, wellbore/well components, etc. Solve problems such as salt and temperature resistance, and achieve the effect of overcoming the rise of interfacial tension, good emulsification performance, and low interfacial tension

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
The invention patent "An amide group-containing hydroxysultaine and its preparation and application" (application number 201010130408.2) discloses a new type of betaine zwitterionic surfactant, which discloses erucic acid amide hydroxysultaine The formula system formed all can reach ultra-low interfacial tension, but the synthesis of this betaine adopts erucic acid as raw material, and its cost is very high, and the formula system that simply uses erucic acid amide hydroxysultaine as surfactant is less The interfacial tension rebounded after 1 hour, and could not reach ultra-low interfacial tension after 105 minutes

Method used

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  • Binary alkali-free complex composition for flooding, suitable for high-temperature and high-salinity reservoir, and application thereof
  • Binary alkali-free complex composition for flooding, suitable for high-temperature and high-salinity reservoir, and application thereof
  • Binary alkali-free complex composition for flooding, suitable for high-temperature and high-salinity reservoir, and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Embodiment 1 interface performance test

[0033] 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 Oleic acid amido sulfobetaine and carbon octadecyl dimethyl hydroxysulfobetaine as a composite surfactant binary non-alkali composite oil flooding composition has been tested for interfacial properties, wherein the above-mentioned oleic acid The structures of amido sulfobetaine, erucic acid amido sulfobetaine and carbooctadecyl dimethyl sulfobetaine are shown below respectively (the hydroxysulfobetaine in the following examples is the same as here same as sulfobetaine):

[0034] Oleamide Hydroxysultaine:

[0035]

[0036]Erucic acid amido sulfobetaine:

[0037]

[0038] Carbooctadecyldimethylhydroxysultaine:

[0039]

[0040] experiment method:

[0041] Formation water with a salinity of 84000mg / L was used to prepa...

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: Formation water with a salinity of 84000 mg / L was used as a solvent to prepare a solution with a composite surfactant concentration of 0.2 wt%, and no polymer was added. The interfacial tension of the above solution was tested with a TX500C interfacial tension tester by the rotating drop method. The test temperature was 80° C. and the rotational speed was 5000 RPM. The test results are shown in Table 1.

[0050] Table 1 Interfacial Tension Test Results

[0051] Oleic acid amido sulfobetaine: carbooctadecyldimethyl sulfobetaine

[0052] As can be seen from Table 1, within the formula ...

Embodiment 3

[0053] Embodiment 3 Viscosity test

[0054] In this example, the viscosity of the binary non-alkali composite oil flooding composition using a composite surfactant is tested.

[0055] Test method: Formation water with a salinity of 84000mg / L is used to prepare a polymer one-component system solution and a polymer / composite surfactant binary system solution (that is, a composition for binary alkali-free composite oil flooding), wherein the polymer and the concentration of composite surfactant are respectively 2000mg / L, and composite surfactant is oleic acid amido sulfobetaine and carbon octadecyl dimethyl sulfobetaine, and the mass ratio of the two is 7: 3. Three polymers were used to prepare solutions respectively, and their physical and chemical indexes are shown in Table 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...

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Abstract

The invention relates to a binary alkali-free complex composition for flooding, suitable for high-temperature and high-salinity reservoir, and application of the composition. The binary alkali-free complex composition for flooding is composed of the following components measured by total weight of the binary alkali-free complex composition for flooding: 0.05-0.3% of complex surfactants, 0.1-0.25% of polymers and the balance of water; wherein the compound 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 binary alkali-free complex composition for flooding in tertiary oil recovery. According to the binary alkali-free complex flooding composition provided by the invention, interface performance exceeds the performance of the composition simply utilizing erucamide hydroxysulfobetaine as surfactants to achieve ultralow interfacial tension, and at the same time, the interfacial tension of the composition in a long term can be kept at an ultralow state; and oil recovery cost also can be reduced.

Description

technical field [0001] The invention relates to a compound compound oil displacement composition used in tertiary oil recovery, in particular to a binary alkali-free compound oil displacement composition and its application in tertiary oil recovery, belonging to the technical field of oil recovery. Background technique [0002] Chemical flooding is one of the main methods of improving oil recovery in my country's waterflood development oilfields (the reserves and production of which account for more than 80% of the country), and it is the main direction of research on enhanced oil recovery in my country. Among them, the ASP flooding system composed of surfactants, alkalis, polymers, etc. has undergone in-depth laboratory research and field application in large-scale oil fields. A large number of studies have shown that the use of composite flooding systems can drive oil more effectively than simple active agent flooding, alkali flooding, and polymer flooding. The pilot fiel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/588C09K8/584E21B43/22
Inventor 张帆秦积舜王强刘春德
Owner PETROCHINA CO LTD
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