Salt-resistant low-interfacial tension foam oil displacement agent

A technology of interfacial tension and foam flooding, which is used in general water supply conservation, wellbore/well components, and production fluids, etc., can solve the problems of no profile control effect, no oil washing effect, etc., and achieves good interfacial activity, low cost, Apply a wide range of effects

Active Publication Date: 2022-05-27
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Conventional surfactants can reduce the interfacial tension of oil and water and improve the oil washing effect, but have no profile control effect; whi

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] This embodiment provides a salt-tolerant and low-interfacial tension foam oil-displacing agent, in mass percentage, the foam oil-displacing agent comprises: dodecyl hydroxypropyl phosphate betaine 0.3%, tetradecyl polyoxyethylene ether Hydroxypropyl carboxylate betaine 0.2%, sodium lauryl alcohol polyoxyethylene ether sulfate 0.1%, tetradecyl fatty alcohol polyoxypropylene ether sodium sulfate 0.2%, N-dodecyl polyoxyethylene ether (3) Base-N,N-dimethyl tertiary amine 0.2%, mineralized water 99%.

[0040] Preparation and testing steps:

[0041] (1) Add 140g of sodium chloride, 5g of calcium chloride and 5g of magnesium sulfate to 1L of distilled water, and then stir to obtain mineralized water.

[0042](2) At room temperature, in terms of mass percentage, sequentially add 0.2% dodecyl hydroxypropyl phosphate betaine, 0.3% tetradecyl polyoxyethylene ether hydroxypropyl carboxylate betaine, and dodecyl Fatty alcohol polyoxyethylene ether sodium sulfate 0.1%, tetradecyl f...

Embodiment 2

[0047] This embodiment provides a salt-tolerant and low-interfacial tension foam oil-displacing agent, in mass percentage, the foam oil-displacing agent comprises: tetradecyl hydroxypropyl phosphate betaine 0.3%, dodecyl fatty alcohol polyoxygen Sodium vinyl ether sulfate 0.1%, cetyl fatty alcohol polyoxypropylene ether sodium sulfate 0.2%, N-dodecyl polyoxyethylene ether (3) base-N,N-dimethyl tertiary amine 0.4%, mineral Water 99%.

[0048] Preparation steps:

[0049] (1) Add 190g of sodium chloride, 5g of calcium chloride and 5g of magnesium sulfate to 1L of distilled water, and then stir to obtain mineralized water.

[0050] (2) At room temperature, in terms of mass percentage, 0.3% of tetradecyl hydroxypropyl phosphate betaine, 0.1% of sodium dodecyl fatty alcohol polyoxyethylene ether sulfate, hexadecyl fatty alcohol poly Oxypropylene ether sodium sulfate 0.2%, N-dodecyl polyoxyethylene ether (3) base-N,N-dimethyl tertiary amine 0.4% and mineralized water 99% were put i...

Embodiment 3

[0055] This embodiment provides a salt-resistant and low-interfacial tension foam oil-displacing agent, in terms of mass percentage, the foam oil-displacing agent comprises: tetradecyl hydroxypropyl phosphate betaine 0.3%, cetyl polyoxyethylene ether Betaine Hydroxypropyl Carboxylate 0.2%, Sodium Lauryl Fatty Alcohol Polyoxyethylene Ether Sulfate 0.1%, Sodium Lauryl Fatty Alcohol Polyoxypropylene Sulfate 0.1%, Myristyl Fatty Alcohol Polyoxypropylene Ether Sodium sulfate 0.1%, N-dodecyl polyoxyethylene ether (3) base-N,N-dimethyl tertiary amine 0.2%, mineralized water 99%.

[0056] Preparation steps:

[0057] (1) Add 150g of sodium chloride, 5g of calcium chloride and 5g of magnesium sulfate to 1L of distilled water, and then stir to obtain mineralized water.

[0058] (2) At room temperature, in terms of mass percentage, sequentially add tetradecyl hydroxypropyl phosphate betaine 0.3%, cetyl polyoxyethylene ether hydroxypropyl carboxylate betaine 0.2%, dodecyl Fatty alcohol p...

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PUM

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Abstract

The invention provides a salt-resistant low-interfacial tension foam oil-displacing agent. The total weight of the oil-displacing agent is 100%, and the oil-displacing agent comprises the following components in percentage by weight: 0.3%-0.5% of a zwitterionic surfactant, 0.1%-0.3% of an anionic and nonionic surfactant, 0.1%-0.4% of a cationic surfactant and the balance of water, the zwitterionic surfactant is one or a mixture of two of straight-chain alkyl hydroxypropyl phosphate betaine and straight-chain alkyl polyoxyethylene ether hydroxypropyl carboxylic acid betaine; the anionic and nonionic surfactant is one or a mixture of two of linear alkyl fatty alcohol polyoxyethylene ether sodium sulfate and linear alkyl fatty alcohol polyoxypropylene ether sodium sulfate; the cationic surface active agent is N-dodecyl polyoxyethylene ether (3) group-N, N-dimethyl tertiary amine. The salt-resistant low-interfacial-tension foam oil-displacing agent disclosed by the invention does not contain alkali and has no damage to stratums.

Description

technical field [0001] The invention relates to the field of oilfield exploitation, in particular to a salt-tolerant low interfacial tension foam oil-displacing agent. Background technique [0002] Most of my country's oilfields are in a period of high water cut, and the continuation of conventional water flooding is limited in greatly improving oil recovery. According to the analysis of the influencing factors on the sweep coefficient and oil displacement efficiency, it is necessary to consider the two influencing factors of sweep coefficient and oil displacement efficiency to improve oil recovery. The conventional surfactant can reduce the oil-water interfacial tension and improve the oil washing effect, but has no profile control effect; while the conventional foaming agent has the functions of profile control and plugging, and improves the sweep coefficient, but has no obvious oil washing effect. Low interfacial tension foam flooding system is an oil flooding system dev...

Claims

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Application Information

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IPC IPC(8): C09K8/584C09K8/594C09K8/60E21B43/22
CPCC09K8/584C09K8/594C09K8/604E21B43/16Y02A20/204
Inventor 孙建峰郭东红李睿博
Owner PETROCHINA CO LTD
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