Stratum-adsorption-resistant thick oil viscosity-reducing oil-displacing agent and applications thereof

An oil-displacing agent, a technology for heavy oil, applied in drilling compositions, chemical instruments and methods, organic chemistry, etc., can solve the problems of poor salt resistance, intolerant formation adsorption, and limited increase in recovery rate, etc. Achieve the effects of strong salt tolerance, enhanced oil recovery, and high oil washing efficiency

Active Publication Date: 2020-01-14
SHANDONG XINGANG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at the problem that the existing heavy oil viscosity-reducing oil-displacing agent has poor salt resistance, is not resistant to formati

Method used

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  • Stratum-adsorption-resistant thick oil viscosity-reducing oil-displacing agent and applications thereof
  • Stratum-adsorption-resistant thick oil viscosity-reducing oil-displacing agent and applications thereof
  • Stratum-adsorption-resistant thick oil viscosity-reducing oil-displacing agent and applications thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] 1.1 Example 1: Preparation of heavy oil viscosity reducing oil displacement agent sample 1

[0042] Take 10% sodium dodecylphenol polyoxyethylene ether (9EO)-3,5-dimethylene-dodecylbenzene sulfonate and 15% sodium dodecylphenol polyoxyethylene ether (3EO) sulfonate , Take 10% of octylphenol polyoxyethylene ether (10EO), take 5% of lauric acid diethanolamide, take 20% of methanol, add water to 100%, mix and stir evenly, and obtain heavy oil viscosity reducing oil displacement agent sample 1.

[0043] The structural formula of dodecylphenol polyoxyethylene ether (9EO)-3,5-dimethylene-dodecylbenzenesulfonate used in embodiment 1 is as follows:

[0044]

Embodiment 2

[0045] 1.2 Example 2: Preparation of heavy oil viscosity reducing oil displacement agent sample 2

[0046] Take 15% of nonylphenol polyoxyethylene ether (9EO)-3,5-dimethylene-dodecylbenzene sulfonate, 15% of sodium lauryl alcohol polyoxyethylene ether (4EO), and Take 10% nonylphenol polyoxyethylene ether (10EO), take 5% palmitic acid diethanolamide, take 20% ethanol, add water to 100%, mix and stir evenly, and obtain heavy oil viscosity reducing oil displacement agent sample 2.

[0047] The nonylphenol polyoxyethylene ether (9EO)-3,5-dimethylene-dodecylbenzenesulfonate sodium used in Example 2 has the following structural formula:

[0048]

Embodiment 3

[0049] 1.3 Example 3: Preparation of heavy oil viscosity reducing oil displacement agent sample 3

[0050] Take dodecylphenol polyoxyethylene ether (9EO)-3,5-dimethylene-didodecylphenol polyoxyethylene ether (3EO) sodium hydroxypropanesulfonate 10%, take dodecyl alcohol polyoxyethylene Ether (4EO) sodium sulfonate 15%, take nonylphenol polyoxyethylene ether (5EO) hydroxypropyl sulfonate 10%, take stearic acid diethanolamide 5%, take isopropanol 20%, replenish water to 100 %, mixed and stirred evenly to obtain heavy oil viscosity reducing oil displacement agent sample 3.

[0051] The structural formula of dodecylphenol polyoxyethylene ether (9EO)-3,5-dimethylene-didodecylphenol polyoxyethylene ether (3EO) sodium hydroxypropanesulfonate used in Example 3 is as follows:

[0052]

[0053] 2. Laboratory performance test

[0054] 2.1 Measurement of interfacial tension of heavy oil viscosity reducing oil displacement agent

[0055] The samples of Examples 1-3 were taken, and a ...

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Abstract

The invention discloses a stratum-adsorption-resistant thick oil viscosity-reducing oil-displacing agent and applications thereof, and belongs to the technical field of oil exploitation, wherein the oil displacing agent comprises: 10-15 wt% of a triple anionic and nonionic surfactant, 10-15 wt% of an anionic and nonionic surfactant, 10-30 wt% of a nonionic surfactant, 15-25 wt% of low-carbon alcohol and 15-55 wt% of water. According to the invention, under the concentration of 0.3%, the oil-water interfacial tension is less than or equal to 1.0*10<-1> mN/m, the viscosity reduction rate is morethan or equal to 95%, and the natural dehydration rate is more than or equal to 80%; after stratum sand adsorption is simulated, the oil-water interfacial tension is less than or equal to 1.0*10<-1>mN/m, and the viscosity reduction rate is greater than or equal to 90%; and the product has easily available raw materials, is convenient to use, is suitable for heavy oil reservoirs with formation water mineralization degree of lower than 300000 mg/L, calcium and magnesium ion concentration of lower than 5000 mg/L and crude oil viscosity of lower than 10000 mPa.s, and can greatly enhance the crude oil recovery ratio.

Description

technical field [0001] The invention belongs to the technical field of petroleum exploitation, and in particular relates to a heavy oil viscosity-reducing oil-displacing agent resistant to formation adsorption. Background technique [0002] Heavy oil viscosity reduction oil displacement technology is a kind of heavy oil cold recovery technology. This technology injects the heavy oil viscosity reduction oil displacement agent solution into the formation, and uses the oil washing function of the oil displacement agent to strip the crude oil on the formation sand and reduce the viscosity of the crude oil. , to facilitate the migration of crude oil in the formation, so as to enhance the recovery of crude oil, it is an oil recovery technology with great development potential. [0003] With the development of heavy oil cold recovery technology, people have developed many different kinds of heavy oil viscosity reducing oil displacement agents. CN107365574A discloses a viscosity-re...

Claims

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Application Information

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IPC IPC(8): C09K8/584C07C309/42
CPCC07C309/42C09K8/584
Inventor 吴庆凯李金平秦玉斌祝东明姜力华胡朋朋丁锡刚
Owner SHANDONG XINGANG CHEM
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