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A foaming agent for supercritical carbon dioxide flooding soluble profile control and its preparation method

A carbon dioxide and foaming agent technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of low solubility of carbon dioxide, insoluble in water phase, high price, etc., and achieve low product price and easy operation. , the effect of increasing the solubility

Active Publication Date: 2018-05-25
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] Chinese patent CN102337874A discloses an oil-soluble surfactant for carbon dioxide flooding, which is n-butyl citrate and n-octyl citrate. These surfactants are slightly soluble in carbon dioxide, but cannot be dissolved in water phase
[0012] But looking at these blowing agents, there are certain deficiencies, such as expensive or low solubility in carbon dioxide.

Method used

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  • A foaming agent for supercritical carbon dioxide flooding soluble profile control and its preparation method
  • A foaming agent for supercritical carbon dioxide flooding soluble profile control and its preparation method
  • A foaming agent for supercritical carbon dioxide flooding soluble profile control and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The synthesis of embodiment 1 alkyl polyoxyalkyl ether

[0031] Add 20.0 g isooctyl alcohol and catalyst 1.0 g KOH in the autoclave, with N 2 Replace the air in the kettle for 3 times, then heat the kettle to 80°C, add 53.4g of propylene oxide after vacuuming to remove water, heat to 160°C for ring-opening polymerization reaction for 3h, then continue to add 13.5g of ethylene oxide for 2h reaction , after the end, the kettle is opened to cool down, and the product is discharged.

Embodiment 2

[0032] The synthesis of embodiment 2 alkyl polyoxyalkyl ether carboxylate sodium

[0033] Add 56.6 g (0.10 mol) of the product in Example 1, 4.0 g (0.1 mol) of sodium hydroxide, and 11.6 g (0.1 mol) of sodium chloroacetate into the three-necked flask. Install a thermometer, reflux condenser and electric mechanical stirrer, Nitrogen was used to protect the reflux condensing pipe, and the stirring was started and heated to 90°C. After reacting for 3 hours, the product was obtained by cooling down.

Embodiment 3-8

[0034] Embodiment 3-8 Solubility test in carbon dioxide of surfactant

[0035] Take 0.15, 0.25, 0.35, 0.45, 0.55, and 0.65 g of the products in Example 2, respectively, and add them to a high-pressure reactor with a glass window in sequence, feed carbon dioxide to 15 MPa, heat to 40°C, and fine-tune the pressure to 20.0 MPa , the supercritical carbon dioxide at this time is 95.3 g calculated by the volume of the reactor. Start the mechanical stirring, observe the dissolution of the solid surfactant, the results are shown in Table 1.

[0036] Solubility test in table 1 surfactant carbon dioxide

[0037] Example

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Abstract

The invention relates to a chemical additive used in oil fields to improve oil recovery efficiency and a preparation method thereof, in particular to a foaming agent for profile control soluble in supercritical carbon dioxide and a preparation method thereof. The structural feature of the surfactant is that carbon dioxide-friendly branched epoxy alkyl groups, ester groups, and carboxylate characteristic groups are introduced into the hydrophobic chain, so that it has better carbon dioxide-friendly and hydrophilic properties. The preparation method of the surfactant disclosed by the invention uses alkyl alcohol as an initiator to initiate the polymerization of alkylene oxide, and undergoes carboxylation to obtain the final product. The surfactant has the following advantages: (1) The synthetic route is mature and easy to operate; (2) It has high solubility in supercritical carbon dioxide.

Description

technical field [0001] The invention relates to a chemical additive used in oil fields to improve oil recovery efficiency and a preparation method thereof, in particular to a foaming agent for profile control soluble in supercritical carbon dioxide and a preparation method thereof. Background technique [0002] CO 2 Due to its unique oil displacement principle, the oil displacement technology has great application potential in the tertiary oil recovery engineering of high temperature, high salinity, low permeability and heavy oil reservoirs, and has gradually developed into a major tertiary oil recovery project in the world. means of oil extraction. In China, carbon dioxide flooding has been carried out in field experiments in Daqing, Shengli, Zhongyuan, Jilin and other large oil fields, and achieved good oil displacement effects. But due to CO 2 Compared with water flooding, it is more prone to viscous fingering and gravity overriding. Long-term injection will form gas c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/594C09K8/584
Inventor 朱魁袁俊秀曾志强庞雨微杨智中
Owner CHINA PETROLEUM & CHEM CORP