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Low-temperature demulsifying agent and preparation method thereof

A demulsifier and low-temperature technology, which is applied in the field of demulsifier and oil well produced fluid dehydration, can solve the problems of inapplicability, poor adaptability of crude oil products, demulsifier flocculation ability, coalescence ability and dehydration effect are not ideal, etc. Achieve the effect of reducing production cost and saving energy

Active Publication Date: 2008-01-09
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The prepared demulsifier has unsatisfactory flocculation ability, coalescence ability and dehydration effect, and poor adaptability to crude oil products
The demulsifiers used in various oil fields are developed for different physical properties of crude oil. They are highly targeted and have poor effect on low-temperature dehydration of crude oil, so they are not suitable

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] One, the preparation of intermediate PEA

[0019] First, add 1 mol of phenol and 3 mol of tetraethylenepentamine into the reaction kettle to start stirring, heat up to 140°C, evacuate and fill with nitrogen, then slowly add 3 mol of formaldehyde dropwise, the reaction pressure is 0.3-0.45MPa, and the reaction temperature is 140±5°C ;After 2 hours of reaction, the temperature dropped to 120°C, and then slowly added dropwise 0.035mol of toluene, the reaction pressure was 0.2-0.35MPa, and the reaction temperature was 120±5°C, and the reaction was balanced for 1 hour. After the pressure in the reactor returned to zero, the temperature was lowered to obtain the intermediate PEA.

[0020] 2. Preparation of dry agent

[0021] First, add 35% intermediate PEA and 3.0% sodium hydroxide to the reaction kettle, start stirring, heat up to 135°C, evacuate, fill with nitrogen, and then slowly add 27% propylene oxide dropwise. The reaction pressure is 0.2~0.25MPa , Reaction temperatu...

Embodiment 2

[0025] One, the preparation of intermediate PEA

[0026] First, add 1.2 mol of phenol and 2.6 mol of tetraethylenepentamine into the reaction kettle to start stirring, heat up to 140°C, evacuate and fill with nitrogen, then slowly add 2.3 mol of formaldehyde dropwise, the reaction pressure is 0.3-0.45MPa, and the reaction temperature is 140°C. ±5°C; after 2 hours of reaction, the temperature drops to 120°C, then slowly add 0.04mol of toluene dropwise, the reaction pressure is 0.2-0.35MPa, the reaction temperature is 120±5°C, and the reaction is balanced for 1 hour. After the pressure in the reactor returns to zero, the temperature is lowered. The intermediate PEA is obtained.

[0027] 2. Preparation of dry agent

[0028] First, add 24% intermediate PEA and 1.8% sodium hydroxide to the reaction kettle, start stirring, heat up to 135°C, evacuate, fill with nitrogen, and then slowly add 33% propylene oxide dropwise. The reaction pressure is 0.2-0.25MPa , Reaction temperature 13...

Embodiment 3

[0032] One, the preparation of intermediate PEA

[0033] First, add 1.4 mol of phenol and 3.3 mol of tetraethylenepentamine to the reaction kettle to start stirring, heat up to 140°C, evacuate and fill with nitrogen, then slowly add 3.8 mol of formaldehyde dropwise, the reaction pressure is 0.3-0.45MPa, and the reaction temperature is 140°C. ±5°C; After 2 hours of reaction, the temperature drops to 120°C, then slowly add 0.045mol of toluene dropwise, the reaction pressure is 0.2-0.35MPa, the reaction temperature is 120±5°C, and the reaction is balanced for 1 hour. After the pressure in the reactor returns to zero, cool down. The intermediate PEA is obtained.

[0034] 2. Preparation of dry agent

[0035] First, add 38% intermediate PEA and 3.3% sodium hydroxide to the reaction kettle, start stirring, heat up to 135°C, evacuate, fill with nitrogen, and then slowly add 25.7% propylene oxide dropwise. The reaction pressure is 0.2~0.25MPa , Reaction temperature 130±5℃; then slowl...

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Abstract

A low-temperature demulsifying agent consists of drying agent 45-65 wt%, methanol 5-10 wt% and water residues. The drying agent comprises intermediate PEA 21.5-40 wt%, sodium hydrate 1.5-3.5 wt%, ethylene epoxide 20-40 wt%, epoxy-propane 15-35 wt%, and epoxy chloropropane 2-8 wt%. Intermediate PEA contains phenol 0.8-1.5 mol, pentammine tetra-alkyl 2.5-3.5 mol, methanal 2.0-3.5 mol and toluene 0.02-0.05 mol. The dewatering temperature is between 30-35 deg. C, crude water content is less than 0.2% when use level is between 50-60mg / l, oily content of separated sewage is less than 500mg / l. It saves energy resources and costs low and can be used for dewatering extract in oil well.

Description

technical field [0001] The invention relates to the technical field of oil field chemistry, in particular to a demulsifier for oil well production fluid dehydration, which is a demulsifier used under low temperature conditions. Background technique [0002] Crude oil demulsifier is a chemical agent commonly used in the dehydration treatment of oil field crude oil gathering and transportation process. At present, there are many synthetic techniques for various types of crude oil demulsifiers. The prepared demulsifier has unsatisfactory flocculation ability, coalescence ability and dehydration effect, and poor adaptability to crude oil products. The demulsifiers used in various oil fields are developed for different physical properties of crude oil. They are highly targeted and have poor effect on low-temperature dehydration of crude oil, so they are not suitable. Contents of the invention [0003] The purpose of the present invention is to provide a low-temperature demuls...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G33/04
Inventor 付亚荣蔡远红田炜马永忠刘建华吴泽美李冬青潘传英蒲祥金陈宝新孔繁勋
Owner PETROCHINA CO LTD
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