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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 displacement agent cannot meet the requirements of steam injection, and cannot fully exert its oil displacement effect in the case of high formation water salinity in heavy oil reservoirs

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

Embodiment 1

[0036] The mass percentage composition of raw material is as follows:

[0037] Sodium dodecylbenzenesulfonate 0.2%, sodium nonylphenol polyoxyethylene ether carboxylate 0.1%, sodium metaborate 0.05%, water 99.65%, water salinity 1000mg / L;

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

[0039]

[0040] Prepare as follows:

[0041] 1) Add nonylphenol polyoxyethylene ether carboxylate sodium APEC-4 represented by formula (1-1) into water, stir and dissolve to obtain mixture A;

[0042] 2) adding sodium dodecylbenzenesulfonate to the mixture A obtained in step 1), and stirring until dissolved to obtain mixture B;

[0043] 3) Add sodium metaborate into the mixture B obtained in step 2), stir and dissolve to obtain a temperature-resistant and salt-resistant oil-displacement agent.

Embodiment 2

[0045] The mass percentage composition of raw material is as follows:

[0046] 0.3% sodium tetradecylbenzene sulfonate, 0.15% sodium nonylphenol polyoxyethylene ether carboxylate, 0.05% sodium bicarbonate, 99.5% water, the salinity of water is 5000mg / L;

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

[0048]

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

Embodiment 3

[0051] The mass percentage composition of raw material is as follows:

[0052] 0.45% sodium cetylbenzenesulfonate, 0.15% sodium nonylphenol polyoxyethylene ether carboxylate, 0.1% sodium metaborate, 99.3% water, the salinity of water is 10000mg / L;

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

[0054]

[0055] Prepared 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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