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Alkyl-polyethoxy-sodium naphthalene sulfonate foam oil-displacing agent and preparation method thereof

A foam flooding, polyethoxylate technology, applied in chemical instruments and methods, reagents, drilling compositions, etc., can solve the problems of short foam half-life, difficulty in stabilizing foam at high temperature, restricting the practical application of foam flooding, etc. The effect of improving stability, improving oil resistance and excellent foam stabilization performance

Active Publication Date: 2021-02-02
PETROCHINA CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The embodiment of the present application provides an alkyl-polyethoxy-naphthalene sodium sulfonate foam oil displacement agent and its preparation method, which can solve the problem that high-temperature foam is difficult to stabilize in the related art, resulting in a short half-life of the foam, which seriously restricts foam flooding. Practical Application Issues in High Temperature Reservoirs

Method used

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  • Alkyl-polyethoxy-sodium naphthalene sulfonate foam oil-displacing agent and preparation method thereof
  • Alkyl-polyethoxy-sodium naphthalene sulfonate foam oil-displacing agent and preparation method thereof
  • Alkyl-polyethoxy-sodium naphthalene sulfonate foam oil-displacing agent and preparation method thereof

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preparation example Construction

[0055] On the one hand, a kind of alkyl-polyethoxy-naphthalene sulfonate sodium foam oil displacement agent preparation method is provided, see figure 1 , the method includes:

[0056] Step 101, adding naphthalene and concentrated sulfuric acid into the reactor, raising the temperature to the first reference temperature, adding ethylene oxide under stirring, and reacting for 2-4 hours to obtain the first reaction product.

[0057] Step 102: Lower the temperature of the first reaction product to the second reference temperature, the first reference temperature is higher than the second reference temperature, add olefin to continue the reaction for 2-3 hours, adjust the pH value with a pH regulator to obtain the alkyl-polyethylene Sodium oxy-naphthalenesulfonate foaming agent.

[0058] The foam oil displacement agent provided by the embodiments of the present application has at least the following technical effects:

[0059] In the foam oil displacement agent provided in the e...

Embodiment 1

[0100] Add 50g of naphthalene and 45g of concentrated sulfuric acid into the reactor, raise the temperature to 160°C, add 240g of ethylene oxide and stir for 3h, cool down to 110°C, slowly add 60g of 1-dodecene, continue the reaction for 3h, cool down to 25°C, add hydrogen oxide Sodium adjusts the pH value to 7 to obtain a foam oil displacement agent.

Embodiment 2

[0102] Add 50g of naphthalene and 60g of concentrated sulfuric acid into the reactor, raise the temperature to 170°C, add 300g of ethylene oxide and stir for 3h, cool down to 120°C, slowly add 75g of 1-dodecene, continue the reaction for 3h, cool down to 10°C, add hydrogen oxide Sodium adjusts the pH value to 7 to obtain a foam oil displacement agent.

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Abstract

The invention discloses an alkyl-polyethoxy-sodium naphthalene sulfonate foam oil-displacing agent and a preparation method thereof, and belongs to the technical field of tertiary oil recovery. The method comprises the following steps of: adding naphthalene and concentrated sulfuric acid into a reactor, heating to a first reference temperature, introducing ethylene oxide while stirring, and reacting for 2-4 hours to obtain a first reaction product; and cooling the first reaction product to a second reference temperature, adding olefin and continuing to react for 2-3 hours, and regulating the pH value by using a pH regulator to obtain the alkyl-polyethoxy-sodium naphthalene sulfonate foam agent. The stability of the foam oil-displacing agent is improved, the foam stabilizing performance isexcellent, the oil resistance of the foam oil-displacing agent is improved, and due to the fact that olefin groups are lipophilic groups, the oil-water balance of the foam oil-displacing agent is balanced, and the foaming ratio of the foam oil-displacing agent is increased.

Description

technical field [0001] The application relates to the technical field of tertiary oil recovery, in particular to an alkyl-polyethoxy-naphthalene sodium sulfonate foam oil displacement agent and a preparation method thereof. Background technique [0002] There are a large number of heavy oil reservoirs with low permeability and high water content in my country. Gas flooding is one of the important means to improve the recovery of the above oil fields. However, the above oil reservoirs have a large number of fractures due to complex formation structures and fracturing operations. Therefore, ordinary gas flooding will cause problems such as gas channeling in oil wells, resulting in a decline in oil flooding effect. Foam flooding, as an important oil displacement method in tertiary oil recovery, has been widely used in oil field profile control, water shutoff and oil displacement. drop problem. [0003] Foam oil displacement agents used in related technologies include α-olefin...

Claims

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Application Information

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IPC IPC(8): C08G65/26C08G65/329C09K8/584
CPCC08G65/26C08G65/329C09K8/584Y02P20/141
Inventor 王洪涛张玉珍何萌曾庆桥冯丽娟章峻
Owner PETROCHINA CO LTD
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