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A self-demulsifying salt-resistant heavy oil cold recovery oil displacement agent and its preparation method and application

A technology of oil displacement agent and heavy oil, which is applied in the field of self-demulsification anti-salt heavy oil cold recovery oil displacement agent and its preparation, can solve the problems of reducing viscosity reduction effect and compounding difference, and achieves oil-water interface uniformity, Good synergy, clear water effect

Active Publication Date: 2022-04-05
DESHI ENERGY TECH GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The prior art has also obtained a series of viscosity reducers with self-demulsification effects by compounding existing surfactants, such as CN109294548A, CN108559470, etc., but due to the difference in compounding properties between various surfactants, On the contrary, it will reduce its own viscosity-reducing effect

Method used

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  • A self-demulsifying salt-resistant heavy oil cold recovery oil displacement agent and its preparation method and application
  • A self-demulsifying salt-resistant heavy oil cold recovery oil displacement agent and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0032] 40g A 21 EO 11 C-Na, 5g EL-10, 17g isopropanol, 6g octylphenol polyoxyethylene (5) ether phosphate were added to the stirring reaction kettle in sequence, and then 32g deionized water was slowly added in batches. Stir at low temperature for 1 hour, cool to normal temperature, and prepare 100 g of oil displacing agent, which is a uniform yellow liquid with good water solubility, solid content of 50%, and pH of 8.

Embodiment 2-4

[0034]The composition and preparation method of Examples 2-4 are roughly the same as those of Example 1, the only difference being that the polyoxyethylene castor oil used is EL-20, EL-40, EL-60 respectively, and the other groups The points and dosage are the same. The appearance of the obtained oil displacement agent is uniform yellow liquid, the solid content is 49%-55%, and the pH is 7-8.

Embodiment 5-8

[0036] The components and preparation method of Examples 5-8 are basically the same as those of Example 2, all using 17g of isopropanol and 6g of octylphenol polyoxyethylene ether (5) phosphate, the only difference is that the total mass of active components added and active ingredient A 21 EO 11 The mass ratios of C-Na and EL-20 are different. Among them, the masses of the added active components in Examples 5-8 are 40g, 44g, 48g and 44g respectively, and the balance is made up to 100g with deionized water. The appearance of the obtained oil displacement agent is uniform yellow liquid, the solid content is 50%-55%, and the pH is 7-8.

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Abstract

The invention provides a self-demulsifying anti-salt heavy oil cold recovery oil displacement agent, comprising: 40-50wt% active components, 15-20wt% additives, 5-8wt% penetrating agent, and the balance Be deionized water; Described active component comprises: mass ratio is (8-10): (1-3): (4-6) fatty alcohol polyoxyethylene ether carboxylate, polyoxyethylene castor oil and fatty acid ‑amine complexes. The self-demulsifying anti-salt heavy oil cold recovery oil displacement agent provided by the application has good compoundability among its components, and can be used in heavy oil with high viscosity and high salinity of formation water. It exhibits remarkable viscosity-reducing performance, and can also exhibit better self-demulsification effect after viscosity reduction, and also shows a good synergistic effect among various components. Especially when the active ingredient A 21 EO 11 When the mass ratio of C-Na, EL-20 and palmitic acid-ethanolamine compound is 8:3:5, the demulsification performance is optimal.

Description

technical field [0001] The invention relates to the technical field of oilfield chemicals, in particular to a self-demulsifying salt-resistant heavy oil cold recovery oil displacement agent and its preparation method and application. Background technique [0002] Heavy oil generally refers to heavy crude oil with high viscosity, high density, and high content of colloids and asphaltene. Worldwide, heavy oil reserves are equivalent to ordinary crude oil, and heavy oil accounts for about 30% of crude oil reserves in my country, which is an important strategic resource. Due to the high content of colloid and asphaltene in heavy oil, high viscosity and poor fluidity, it is difficult to mine and the recovery rate is low. [0003] High-efficiency surfactants for salt-resistant flooding are an important support for chemical flooding to enhance oil recovery. Surfactant is an important auxiliary agent for chemical flooding, which can greatly improve oil recovery by improving oil di...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/58C09K8/584
CPCC09K8/584C09K8/58C09K2208/26
Inventor 崔仕章宋新旺崔学章郭鑫徐丽君刘小芳
Owner DESHI ENERGY TECH GRP CO LTD