Preparation of polymer flooding produced fluid demulsifier

A demulsifier and polymer technology, which is applied in the field of chemical treatment agent preparation for oilfield produced fluid, can solve the problems of high technical difficulty, inability to meet production and technical requirements, and difficulty in separating oil and water from produced fluid.

Active Publication Date: 2012-09-19
DESHI ENERGY TECH GRP CO LTD
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0002] At present, polymer flooding is the most widely used EOR chemical flooding technology at home and abroad. Polymer flooding has greatly improved oil recovery; however, with the continuous injection of polymers, the polymers returned to the ground The concentration increases significantly, and the composition of the produced fluid becomes more and more complex. It is generally composed of different types of mixed emulsions such as W/O, O/W, and multiple emulsified W/O/W. The emulsification state is complex and stable. The polymer flooding produced fluid The existence of the polymer in the medium changes the interface properties of the oil-water emulsion, which directly affects the mutual aggregation tendency between the dispersed phases, the oil-water separation speed, the oil-water separation effect, etc., making the oil-water separation of the production fluid more difficult; in the static sedimentation separation test It was found that after 10 minutes of static sedimentation and separation, a more serious intermediate mixed emulsified layer was formed between the upper oil layer and th

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  • Preparation of polymer flooding produced fluid demulsifier
  • Preparation of polymer flooding produced fluid demulsifier
  • Preparation of polymer flooding produced fluid demulsifier

Examples

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Effect test

Embodiment 1

[0029] 1) Add 150kg of p-tert-butylphenol and 280kg of polyethylene polyamine into the reaction equipment, raise the temperature to 90-95°C, after the materials are fully dissolved, cool down to 20°C, add 100kg of formaldehyde dropwise, and control the temperature and speed of dropping; After the reaction is completed, add 100kg of xylene, heat up to 130-160°C, reflux and separate water until there is no more moisture, and then obtain a phenolic resin.

[0030] 2) Put 200kg of phenolic resin into the reactor while it is hot, vacuum for 15 minutes, the pressure in the reactor reaches the lowest, add 8kg of potassium hydroxide (50% aqueous solution) as a catalyst, stir evenly, heat up to 110-140℃ steadily, vacuum Dehydration, until the moisture is removed, fill with nitrogen to normal pressure, add 4000 kg of propylene oxide dropwise, keep the reaction temperature between 120-160°C, keep the temperature for 1-1.5 hours after the dropwise addition, and then vacuum for 15 minutes; ...

Embodiment 2

[0036] 1) Add 150kg of p-tert-butylphenol and 560kg of polyethylene polyamine into the reaction equipment, raise the temperature to 90-95°C, after the materials are fully dissolved, cool down to 20°C, add 200kg of formaldehyde dropwise, and control the temperature and speed of dropping; After the reaction is completed, add 150kg of xylene, heat up to 130-160°C, reflux and separate water until there is no more moisture, and then obtain a phenolic resin.

[0037] 2) Put 200kg of phenolic resin into the reactor while it is hot, vacuum for 15 minutes, the pressure in the reactor reaches the lowest, add 10kg of potassium hydroxide (50% aqueous solution) as a catalyst, stir evenly, and raise the temperature steadily to 110-140°C, vacuum Dehydration, until the moisture is removed, fill with nitrogen to normal pressure, add 5500kg of propylene oxide dropwise, keep the reaction temperature between 120-160°C, keep the reaction for 1-1.5 hours after the addition is completed, and vacuum f...

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Abstract

The invention provides a preparation method of a polymer flooding produced fluid demulsifier, which mainly comprises the following steps: condensing p-tert-butyl phenol, polyethylene polyamine and formaldehyde to obtain a thermoplastic phenol amine resin of which the molecular weights are within a certain range; sequentially and proportionally carrying out ring-opening polymerization on the resin, epoxyethane and propylene oxide; mixing the synthesized products with different molecular weights in a certain mass ratio, and regulating the pH value with acetic acid; and finally, cross-linking with dicarboxylic acid to obtain the final product. The invention aims to solve the problems of severe oil/water emulsification, greater difficulty in oil-water separation, high oil content in dehydrated water and the like in the polymer flooding produced fluid, and the problem that the dehydration effect of the conventional demulsifier on the produced fluid is not ideal.

Description

technical field [0001] The invention relates to a method for synthesizing a polymer material, in particular to a method for preparing a demulsifier for polymer flooding production fluid, and belongs to the field of preparation of chemical treatment agents for oilfield production fluid. Background technique [0002] At present, polymer flooding is the most widely used EOR chemical flooding technology at home and abroad. Polymer flooding has greatly improved oil recovery; however, with the continuous injection of polymers, the polymers returned to the ground The concentration increases significantly, and the composition of the produced fluid becomes more and more complex. It is generally composed of different types of mixed emulsions such as W / O, O / W, and multiple emulsified W / O / W. The emulsification state is complex and stable. The polymer flooding produced fluid The existence of the polymer in the medium changes the interface properties of the oil-water emulsion, which direc...

Claims

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Application Information

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IPC IPC(8): C10G33/00
Inventor 王黎明徐家业谷之辉崔仕章崔学章高瑞美薛军许继平刘忠艳
Owner DESHI ENERGY TECH GRP CO LTD
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