Temperature-resistant and salt-resistant oil displacement agent for offshore thickened oil steam injection accompanying, and application thereof

A technology of temperature resistance, salt resistance, oil displacement agent, applied in the direction of chemical instruments and methods, drilling composition, etc. Tension and other problems, to achieve good emulsification and viscosity reduction performance, reduce oil-water interfacial tension, and promote the effect of adsorption

Pending Publication Date: 2021-05-04
CNOOC TIANJIN BRANCH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a temperature-resistant and salt-resistant oil-displacing agent for heavy oil steam injection in the sea. The existing oil dis

Method used

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  • Temperature-resistant and salt-resistant oil displacement agent for offshore thickened oil steam injection accompanying, and application thereof
  • Temperature-resistant and salt-resistant oil displacement agent for offshore thickened oil steam injection accompanying, and application thereof
  • Temperature-resistant and salt-resistant oil displacement agent for offshore thickened oil steam injection accompanying, and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0035]Example 1

[0036]The quality percentage of raw materials is as follows:

[0037]1. 0.2% sodium dodecyl benzene sulfonate, 0.1% sodium phenol polyoxyethylene ether carboxylate, 0.05% sodium meanate, 99.65% water, water mineralization degree of 1000 mg / L;

[0038]Among them, the molecular formula of the nonylphenol polyoxyethylene ether carboxylate APEC-4 is:

[0039]

[0040]Preparation according to the following steps:

[0041]1) APEC-4 shown in the formula (1-1) is added to the water, and the mixture is dissolved in water.

[0042]2) Add sodium dodecyl benzene sulfonate to step 1), stirred to dissolve, resulting in mixture B;

[0043]3) Add sodium sodium oligate to step 2) The resulting mixture B, stirred and dissolved, i.e., the temperature resistant salt water supply resistant agent.

Example Embodiment

[0044]Example 2,

[0045]The quality percentage of raw materials is as follows:

[0046]4% sodium fourteenalkylbenzene sulfonate, 0.05% sodium hydrochloride polyoxyethylene ether carbonate, 0.05% sodium bicarbonate, 99.5% water, water mineralization degree of 5000 mg / L;

[0047]Among them, the molecular formula of the nanophenol polyoxyethylene ether carboxylate APEC-6 is:

[0048]

[0049]Preparation according to the method in Example 1.

Example Embodiment

[0050]Example 3,

[0051]The quality percentage of raw materials is as follows:

[0052]Sodium hexadalkylbenzene sulfonate, 0.15% sodium nonylphenol polyoxyethylene ether carboxylate, 0.1% sodium meanate, 99.3% water, water is 10000 mg / L;

[0053]Among them, the molecular formula of the nanophenol polyoxyethylene ether carboxylate APEC-10 is:

[0054]

[0055]Preparation according to the method in Example 1.

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Abstract

The invention discloses a temperature-resistant and salt-resistant oil-displacing agent for offshore thickened oil steam injection accompanying, and an application thereof. The temperature-resistant and salt-resistant oil displacement agent is prepared from, by mass, 0.1-0.5% of an anionic surfactant, 0.05-0.3% of an anionic-nonionic surfactant, 0.05-0.1% of an interface synergist, and the balance of water, the mass ratio of the anionic surfactant to the anionic-nonionic surfactant is (1-3): 1; the anionic surfactant is sodium linear alkyl benzene sulfonate; and the anionic-nonionic surfactant is a nonylphenol polyoxyethylene ether carboxylate. The oil displacement agent disclosed by the invention not only has better temperature resistance and salt tolerance, but also has stronger capability of reducing oil-water interfacial tension, and solves the problems that the existing oil-displacing agent cannot meet the requirement of injection along with steam and cannot give full play to the oil-displacing effect under the condition of high mineralization degree of formation water of a heavy oil reservoir.

Description

technical field [0001] The invention relates to a temperature-resistant and salt-resistant oil displacement agent for heavy oil steam injection on the sea and an application thereof, which belongs to the technical field of oil field chemistry. Background technique [0002] Steam flooding technology is an effective method for the development of heavy oil reservoirs, and has become a thermal recovery technology for large-scale industrial applications. For the development characteristics of large well spacing in offshore oilfields, the injected steam gradually condenses into hot water as the temperature drops, and the hot water zone has a large range, and the oil displacement efficiency of hot water is significantly lower than that of steam, resulting in a large amount of crude oil remaining in the hot water zone The underground cannot be recovered, which affects the recovery rate of the entire steam flooding. However, my country's offshore heavy oil reservoirs have problems s...

Claims

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Application Information

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IPC IPC(8): C09K8/592C09K8/584
CPCC09K8/592C09K8/584
Inventor 谭先红郑伟谢昊君王泰超华朝张利军李南田虓丰白玉婷彭世强裴海华张贵才郑家桢
Owner CNOOC TIANJIN BRANCH
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