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Temperature-resistant foam oil-displacing agent, preparation method and application thereof

A foam flooding and temperature-resistant technology, applied in chemical instruments and methods, earthwork drilling, wellbore/well components, etc., can solve problems such as short foam half-life, restrictions on the practical application of foam oil displacement agents, and difficulty in stabilizing foam. Achieve the effects of improving stability, improving oil resistance, and increasing foaming ratio

Active Publication Date: 2022-08-02
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The embodiment of the present application provides a temperature-resistant foam oil displacement agent, a preparation method and its application, which can solve the problem that the foam in the related art is difficult to stabilize at high temperature, resulting in a short half-life of the foam, which seriously restricts the use of the foam oil displacement agent in high temperature reservoirs. practical application issues in

Method used

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  • Temperature-resistant foam oil-displacing agent, preparation method and application thereof
  • Temperature-resistant foam oil-displacing agent, preparation method and application thereof
  • Temperature-resistant foam oil-displacing agent, preparation method and application thereof

Examples

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preparation example Construction

[0054]On the other hand, the embodiments of the present application provide a method for preparing a temperature-resistant foam oil displacing agent, the method is used to prepare any of the above-mentioned foam oil displacing agents, and the method includes: adding olefin into a reactor, and heating to the first A reference temperature of 80-100 ° C, add naphthalene and concentrated sulfuric acid, reflux for 2-6 hours, cool down to the second reference temperature and continue to react for 12-36 hours, add a pH regulator to adjust the pH value to 9-10, and obtain foam after drying Oil displacing agent foaming agent;

[0055] Mix 0.1-0.6% by mass of a foaming agent, 0.01-0.05% by mass of a foam stabilizer and the balance of water to obtain a foam oil-displacing agent.

[0056] Under the oxidation of concentrated sulfuric acid, the foaming agent provided in the examples of the present application undergoes a substitution reaction between the olefin and the hydrogen on the napht...

Embodiment 1

[0077] 60g of 1-tetradecene was added to the reactor, and the temperature was raised to 95°C. Then 50g of naphthalene and 45g of concentrated sulfuric acid were added to the reactor, and the temperature was kept at reflux for 3h, and the temperature was lowered to 25°C. The reaction was continued for 24h, and sodium hydroxide was added to adjust the pH. When the value reaches 10, it is dried with hot air to obtain a foaming agent.

[0078] Take 0.2 g of the above foaming agent, weigh 0.03 g of Welan gum, add 99.77 g of formation water, and mix evenly to obtain a foam oil-displacing agent.

Embodiment 2

[0080] 50g of 1-dodecene was added to the reactor, the temperature was raised to 80°C, then 50g of naphthalene and 40g of concentrated sulfuric acid were added to the reactor, and the temperature was kept for 6h, and the temperature was lowered to 25°C. The reaction was continued for 36h, and sodium hydroxide was added to adjust the pH. When the value reaches 9, it is dried with hot air to obtain a foaming agent.

[0081] Take 0.2 g of the above foaming agent, weigh 0.02 g of welan gum, add 99.78 g of formation water, and mix evenly to obtain a foam oil-displacing agent.

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Abstract

The application discloses a temperature-resistant foam oil displacement agent, a preparation method and an application thereof, belonging to the technical field of tertiary oil recovery. The method includes: adding olefin into a reactor, heating up to a first reference temperature, adding naphthalene and concentrated sulfuric acid, refluxing for 2-6 hours, cooling to a second reference temperature and continuing the reaction for 12-36 hours, adding a pH regulator to adjust the pH value To 9-10, the foaming agent is obtained after drying; the foaming agent with a mass percentage of 0.1-0.6%, a foam stabilizer with a mass percentage of 0.01-0.05% and the balance of water are uniformly mixed to obtain a foam oil-displacing agent. The foam oil displacing agent provided by the present application can be suitable for high temperature reservoir environment, and can play a role even when the reservoir environment temperature is higher than 100°C, the stability of the foam oil displacing agent is improved, and the foam stabilization performance is excellent. Based on the introduction of olefin on the naphthalene ring, the oil-water balance of the foam oil displacing agent is balanced with the sodium sulfonate group, and the foaming ratio of the foam oil displacing agent is improved.

Description

technical field [0001] The present application relates to the technical field of tertiary oil recovery, in particular to a temperature-resistant foam oil displacement agent, a preparation method and applications thereof. Background technique [0002] Gas flooding is one of the important means to enhance oil recovery in heavy oil reservoirs with low permeability and high water cut. However, in the actual oil displacement process, in order to improve oil recovery, the permeability of low-permeability oil reservoirs is often increased by fracturing operations, which will generate a large number of fractures in the formation, causing problems such as gas channeling in oil wells, resulting in The oil displacement effect decreased. Foam flooding technology is an effective solution to the above problems. At present, as an important method of tertiary oil recovery, foam flooding has been widely used in the fields of profile control, water plugging and oil flooding in oilfields. F...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/584C09K8/588E21B43/22
CPCC09K8/584C09K8/588E21B43/16
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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