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Emulsified displacement-permeation oil recovery agent and preparation method thereof

An emulsifying, catalyst technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of thin throat, low crude oil recovery, small pores in low-permeability oil reservoirs, etc. Small, the effect of improving oil displacement efficiency

Active Publication Date: 2015-08-12
唐山冀油瑞丰化工有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although many surfactants have been used as oil displacement agents, due to the influence of factors such as small pores, thin throats, large specific surface area, solid-liquid surface molecular force, and crude oil boundary layer thickness in low-permeability reservoirs, oil recovery is difficult. rate is still low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The cores used in the examples are natural outcrop cores with a length of 23 cm and a diameter of 2.2 cm. The crude oil and formation simulated water are crude oil and water from Dagang Oilfield respectively. (55.2°C).

[0020] Glycidyl ether is self-made in the laboratory: add resorcinol, epichlorohydrin and quaternary ammonium salt catalyst in a flask equipped with a stirrer, reflux condenser, and thermometer, stir and heat to about 85 degrees, and keep it for 4 hours , for etherification reaction. After the etherification reaction is completed, the system is adjusted to a depressurized azeotropic state, the temperature is about 65 degrees, and the vacuum degree is -0.08MPa. The lye is added dropwise for a closed-loop reaction, and the recovery temperature is about 140 degrees. After recovery, add solvent to dissolve, carry out refining reaction, supplement missing solvent, add molten salt, stand to separate phases, neutralize, wash, evaporate and cool, then filter t...

Embodiment 2

[0032] The cores used in the examples are natural outcrop cores with a length of 20 cm and a diameter of 2.2 cm. The crude oil and formation simulated water are crude oil and water from Dagang Oilfield respectively. (56.5°C).

[0033] Glycidyl ether is self-made in the laboratory: add resorcinol, epichlorohydrin and quaternary ammonium salt catalyst in a flask equipped with a stirrer, reflux condenser, and thermometer, stir and heat to about 85 degrees, and keep it for 4 hours , for etherification reaction. After the etherification reaction is completed, the system is adjusted to a depressurized azeotropic state, the temperature is about 65 degrees, and the vacuum degree is -0.08MPa. The lye is added dropwise for a closed-loop reaction, and the recovery temperature is about 140 degrees. After recovery, add solvent to dissolve, carry out refining reaction, supplement missing solvent, add molten salt, stand to separate phases, neutralize, wash, evaporate and cool, then filter t...

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Abstract

The invention relates to an emulsified displacement-permeation oil recovery agent which is composed of the following components in percentage by mass: 25-60% of glycidol ether, 2-30% of assistant, 8-30% of co-activator, 5-20% of catalyst and the balance of water. In the oil recovery agent compounded from multiple components, the assistant glycidol ether has higher surface activity, the oil recovery agent can be effectively applied into the low-permeability reservoir under the recombination actions of the assistant and co-activator, overcomes the defects of small pores, thin throats and large specific area in the low-permeability reservoir, and achieves the goal of high-efficiency oil displacement. The oil displacement efficiency is up to 42.5-44.6% or so, which is greatly enhanced as compared with that of the existing oil displacement agent.

Description

technical field [0001] The invention relates to an oil recovery additive for drilling and a preparation method thereof, in particular to an emulsified seepage displacement oil recovery agent and a preparation method thereof. Background technique [0002] At present, most oil fields in the world have entered the middle and late stages of exploitation. After the oil reservoir has undergone primary oil recovery and secondary oil recovery, more than 60% of the oil geological reserves still remain in the rock pores of the oil reservoir. At present, there are many tertiary oil recovery methods, and surfactants have been widely valued in tertiary oil recovery. Because the use of surfactants can reduce the interfacial tension between oil and water, and reduce the retention of residual oil in capillaries, the oil displacement efficiency is higher. Although there are many types of surfactants, due to the complex composition of crude oil and the consideration of formation adsorption lo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/584C09K8/58
CPCC09K8/58C09K8/584
Inventor 李玲张强张晓龙毛雨润刘晗涛纪娜
Owner 唐山冀油瑞丰化工有限公司