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Steam flooding additive

An additive and steam flooding technology, which is applied in the direction of drilling composition, chemical instruments and methods, etc., can solve the problems of poor adaptability, limited thermal stability, and narrow application range of steam flooding additives, so as to improve the wettability and permeability , reduce the adhesion work and increase the recovery factor

Active Publication Date: 2013-09-25
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing chemical additives for thermal oil recovery have limited thermal stability, and the research and development of their functions are often limited to one of the above three main aspects. The application in thermal recovery is limited, and it is necessary to research and develop heavy oil thermal recovery additives with strong adaptability and wide range of functions from the perspective of functional integration

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Add 70 g of dimer fatty acid, 20 g of emulsifier octylphenol polyoxyethylene ether and 10 g of mutual solvent methanol in sequence in the container, stir on a magnetic stirrer, and compound to obtain a steam flooding additive. The obtained steam flooding additive is light yellow liquid.

[0017] In order to analyze the composition of the compounded steam flooding additive, its composition and structure can be analyzed by infrared spectroscopy, and the purity of the compounded surfactant can be determined by the method of measuring the acid value. Infrared spectrum such as figure 1 shown. exist figure 1 Medium, 3200~2800cm -1 It is a broad peak, which is the characteristic peak of carboxylic acid; 2921 and 2855cm -1 It is the contraction vibration peak of methyl methylene; 1711cm -1 It is C=O double bond vibration; 1500~1400cm -1 is the bending vibration of methylmethylene; 1112cm -1 It is C-O-C asymmetric stretching vibration of fatty ether. It can be seen from ...

Embodiment 2

[0022] Similar to Example 1, the difference is that 80 g of dimer fatty acid, 15 g of emulsifier nonylphenol polyoxyethylene ether, and 5 g of mutual solvent ethanol are sequentially added in the container.

Embodiment 3

[0024] Similar to Example 1, the difference is that 67g of dimer fatty acid, 25g of emulsifier laurylphenol polyoxyethylene ether and 8g of mutual solvent isobutanol are added sequentially in the container.

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Abstract

The invention discloses a steam flooding additive and relates to a chemical additive. The invention provides the steam flood additive and a preparation method thereof. With the adoption of the steam flood additive, the wetting and infiltration capacity of filled water can be effectively improved, water adsorption performance in the reservoir is improved, the sweep capacity of the water displacing oil is improved, a wetting contact angle between the crude oil and the rock is increased, and the rock surface is enabled to change into water wetness from oil wetness, so that adhesion work of the oil drop on the rock surface is reduced, and the steam flooding additive is beneficial for extracting the crude oil, thereby the recovery efficiency is improved. The steam flooding additive comprises the following components in percentage by mass: 65-85% of dimer fatty acid; 10-25% of emulsifier and 5-10% of mutual solvent. The dimer fatty acid, the emulsifier and the mutual solvent are added to a container in turn, then are stirred on a magnetic stirrer, and are mixed to obtain the steam flooding additive. The steam flooding additive is a faint yellow liquid.

Description

technical field [0001] The invention relates to a chemical additive, in particular to a steam flooding additive for steam flooding oil recovery in the petroleum industry. Background technique [0002] With the continuous extraction of oil, the world's oil reserves, especially conventional crude oil that is easy to extract and refine, are constantly decreasing. However, people still have a great demand for oil. Therefore, heavy oil, as a kind of unconventional oil resource, has become more and more popular among researchers. attention. The main mining methods used today include thinning viscosity reduction, heating viscosity reduction, emulsification viscosity reduction and polymer viscosity reduction. Among them, steam huff and puff and steam flooding are currently the most widely used recovery methods for heavy oil production in the world. These two methods are used to heat the oil layer after injecting high-temperature steam to reduce the viscosity of crude oil for produc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/592
Inventor 沙勇吴后胜
Owner XIAMEN UNIV
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