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Binary compound oil-flooding composition and application thereof in tertiary oil recovery

A binary compound flooding and composition technology, which is applied in the direction of drilling composition, production fluid, earthwork drilling and production, etc., can solve the problems of being unable to meet the needs of oil displacement operations, failing to achieve ultra-low interfacial tension, and interfacial tension recovery. , to achieve good emulsification performance, low interfacial tension and good interfacial performance

Active Publication Date: 2012-10-03
PETROCHINA CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But the synthesis of this betaine adopts erucic acid as raw material, and its cost is very high, and its interfacial tension of binary system and ternary system made with erucic acid amide sulfobetaine as tensio-active agent has a certain degree after 1 hour. After recovery, the ultra-low interfacial tension cannot be reached after 105 minutes. Therefore, the binary and ternary flooding systems cannot meet the current demands of oil flooding operations

Method used

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  • Binary compound oil-flooding composition and application thereof in tertiary oil recovery
  • Binary compound oil-flooding composition and application thereof in tertiary oil recovery
  • Binary compound oil-flooding composition and application thereof in tertiary oil recovery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment 1 interface performance research

[0034] In this example, the composition for oil displacement using carbon tetradecyl dimethyl hydroxysultaine and erucic acid amido hydroxysultaine as surfactants and the use of erucic acid amido hydroxysultaine The interfacial properties of the binary composite oil flooding composition with carbon tetradecyl dimethyl hydroxy sultaine and carbon tetradecyl dimethyl hydroxy sultaine were studied, wherein the above-mentioned erucic acid amido hydroxy sultaine and carbon fourteen The structure of alkyl dimethyl sulfobetaine is as follows respectively (the hydroxysulfobetaine of the following examples is identical with the hydroxysulfobetaine here):

[0035] Erucic acid amido sulfobetaine:

[0036]

[0037] Carbon Tetradecyl Dimethyl Hydroxysultaine:

[0038]

[0039] experiment method:

[0040] Adopting the formation water whose salinity is 84000mg / L to prepare carbon tetradecyl dimethyl sulfobetaine and star-shaped te...

Embodiment 2

[0045] The proportioning optimization of embodiment 2 composite surfactants

[0046] In this example, the interfacial properties of the composite surfactant composed of erucic acid amido sulfobetaine and carbotetradecyldimethyl sulfobetaine were studied. The above composite surfactant is erucic acid amido sulfobetaine and carbotetradecyl dimethyl sulfobetaine in different mass ratios.

[0047] Test method: Formation water with a salinity of 84000mg / L and a composite surfactant were used to prepare a solution with a composite surfactant concentration of 0.2wt%, without adding polymers; the solution was tested by the spinning drop method using a TX500C interfacial tension tester The interfacial tension, the test temperature is 80 ℃, the rotation speed is 5000RPM, the results are shown in Table 1.

[0048] As can be seen from Table 1, within the ratio range listed, the solution using composite surfactants can reach ultra-low interfacial tension; When methyl sulfobetaine=6:4, th...

Embodiment 3

[0051] Embodiment 3 emulsification performance test

[0052] In this example, the emulsification performance of the binary composite oil flooding composition using a composite surfactant was tested. Wherein, in the above composite surfactant, the mass ratio of erucic acid amido sulfobetaine to carbotetradecyl dimethyl sulfobetaine is 6:4.

[0053] Test method: Formation water with a salinity of 84000mg / L and complex surfactants were used to prepare 50mL of complex surfactant solutions with different concentrations, without adding polymers;

[0054] According to the oil-water ratio of 1:1, crude oil (under the conditions of 95°C and 21.4MPa, the viscosity of crude oil is 0.85mPa·s; the saturated hydrocarbon content is 52%, and the aromatic hydrocarbon content is 43%) is mixed with the above-mentioned composite surfactant solution, poured into in a sealed bottle;

[0055] HZ-8812S water bath reciprocating constant temperature oscillator was used to vibrate at a speed of 90rpm ...

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Abstract

The invention relates to a binary compound oil-flooding composition and application thereof in tertiary oil recovery. According to the total weight of the binary compound oil-flooding composition, the binary compound oil-flooding composition comprises the following components: 0.05 to 0.3% of compound surfactant, 0.1 to 0.25% of polymer and the balance of water, wherein the compound surfactant comprises two kinds of hydroxysulfobetaine with different structures in a mass ratio of 9 : 1 to 3 : 7. The invention further provides the application of the binary compound oil-flooding composition in the tertiary oil recovery. The binary compound oil-flooding composition not only has good interface performance and very good emulsifying property and has a good oil-flooding effect.

Description

technical field [0001] The invention relates to a compound compound oil displacement composition used in tertiary oil recovery, in particular to a binary compound oil displacement composition and its application in tertiary oil recovery, belonging to the technical field of oil recovery. Background technique [0002] At present, most of the water flooding development oilfields in the main oilfields of PetroChina have entered the "double high" development stage of high water cut and high recovery degree, and it is more difficult to further improve the recovery rate. At the same time, with the increasing pressure on oil demand and the further deepening of the exploitation of old oil fields, the importance of tertiary oil recovery technology will become more and more apparent. [0003] The chemical composite flooding technology has been proved by field tests to be one of the effective methods to greatly increase the recovery of water flooding in high water-cut oilfields. The ch...

Claims

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Application Information

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IPC IPC(8): C09K8/584E21B43/22
Inventor 张帆王强罗文利刘春德
Owner PETROCHINA CO LTD
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