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Surfactant composition for high-temperature and high-salt oil reservoir oil-displacing agent

A technology of surfactant and composition, which is applied in the field of surfactant composition for oil flooding in high-temperature and high-minerality reservoirs, can solve problems such as secondary damage to reservoirs, failure to meet application requirements, emulsification, etc., and achieve reduction of oil-water Interfacial tension, system uniformity and stability, and the effect of increasing oil displacement rate

Active Publication Date: 2021-10-29
HEILONGJIANG SHINEWELL CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In ASP flooding, the addition of alkali will increase the dispersion of fine particles such as clay and minerals in the formation, and accelerate their migration, thereby blocking the rock pore throat and destroying the formation structure, which will cause secondary damage to the reservoir, and also cause Pipe string corrosion, production well scaling, pump jamming, rod breakage, and severe crude oil emulsification have brought great burdens to subsequent demulsification and dehydration processes
Strong alkali ASP flooding has begun to limit its application in oil fields. For high temperature and high salinity reservoirs, the use of alkali will bring greater harm
The development of three-component compound flooding towards alkali-free is an inevitable requirement of technological progress, and it is the development direction of compound oil displacement technology. The alkali-free binary flooding system has almost no damage to the formation, but there is no report on large-scale mine application.
However, the common disadvantages are that the system has poor temperature and salt resistance, and the range of enhanced recovery is relatively low, even for those with a temperature of 80°C or above and a high salinity, especially calcium and magnesium ions (≥600mg / L). Reservoirs are completely out of reach for application requirements

Method used

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  • Surfactant composition for high-temperature and high-salt oil reservoir oil-displacing agent
  • Surfactant composition for high-temperature and high-salt oil reservoir oil-displacing agent
  • Surfactant composition for high-temperature and high-salt oil reservoir oil-displacing agent

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preparation example Construction

[0069] The co-solvent is prepared by substituting polyether with halogenated propylene oxide to obtain a glycidyl ether intermediate containing epoxy bonds, and then reacting with polyglycerol for ring-opening. Described solubilizer is prepared by following method:

[0070] Step 1, preparing polyglycerol.

[0071] Polyglycerols were prepared according to classical methods. Mix glycerin and sodium hydroxide, and raise the temperature to 250°C under a nitrogen atmosphere. According to the refractive index, polyglycerols with a degree of polymerization of 2, 3, and 4 can be prepared respectively.

[0072] Step 2, adding the halogenated propylene oxide into the solvent containing the polyether, heating and reacting to obtain the glycidyl ether intermediate containing the epoxy chain segment.

[0073] The polyether is selected from one or more of fatty alcohol polyoxyethylene ether, fatty amine polyoxyethylene ether, fatty alcohol polyoxypropylene polyoxyethylene ether and fatty ...

Embodiment 1

[0090] Add 2mol of 1-dodecylamine into the reactor, then add 100mL of 10mol / L KOH solution, vacuumize the reactor and circulate nitrogen for 3 times to ensure its vacuum environment, heat to 160°C, add 20mol of propylene oxide Add it to the reaction kettle and react until the system pressure no longer changes. Vacuumize the reactor and circulate nitrogen for 3 times to ensure its vacuum environment, add 20mol ethylene oxide, and react at 160°C until the system pressure no longer changes to obtain dodecylamine polyoxypropylene polyoxyethylene ether, The reaction molar yield is above 95%.

[0091] Add 1.5 mol of dodecylamine polyoxypropylene polyoxyethylene ether and 1.5 mol of sodium hydroxide solid into the reactor, blow nitrogen into it for deoxygenation and dehydration, stir the reaction at 100°C for 2.5h, and cool down to room temperature. Raise the temperature to 80°C, slowly add 3.8mol of 3-chloropropene dropwise, stir for 8 hours, wash with hot deionized water, add sodi...

Embodiment 2

[0094] Prepare docosylamine polyoxypropylene polyoxyethylene ether sulfonate according to the method in Example 1, the only difference is: replace 1-dodecyl with equimolar amount of docosane-1-amine amine.

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Abstract

The invention provides a surfactant composition for a high-temperature and high-salt oil reservoir oil-displacing agent. The surfactant composition comprises a main agent, a synergist and a cosolvent. The surfactant composition has good interfacial activity, can further reduce oil-water interfacial tension, has strong solubilizing and emulsifying effects, interaction and synergistic interaction, is uniform and stable in system and continuous and stable in oil displacement performance, and can effectively improve the oil displacement efficiency.

Description

technical field [0001] The invention belongs to the technical field of chemical flooding and recovery, and in particular relates to a surfactant composition for oil flooding in high-temperature and high-minerality oil reservoirs and an application thereof. Background technique [0002] With the gradual development of oilfields, the problem of low recovery rate and degree of high-temperature and high-salt reservoirs has become increasingly prominent, and the research and development of temperature-resistant and salt-resistant surfactant systems is conducive to enhancing oil recovery. The chemical composite flooding technology can greatly increase the oil recovery rate, and has already achieved a significant increase in oil production in China's Daqing Oilfield. Since its application in the field in 2014, the cumulative increase in crude oil production has exceeded 33 million tons. The so-called chemical composite flooding technology includes ASP flooding, which is a strong ba...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/584C09K8/60
CPCC09K8/584C09K8/604
Inventor 徐立波隋新光丁伟徐典平赵新贾世华王屹岭闫磊
Owner HEILONGJIANG SHINEWELL CHEM CO LTD