Polymer-containing produced liquid demulsifier and preparation method thereof

A demulsifier and production fluid technology, which is applied in the field of polymer-containing production fluid demulsifiers and its preparation, can solve the problems of reduced coalescence ability of emulsified oil droplets, increased difficulty in demulsification of polymer-containing production fluid, and serious oil-water emulsification, etc.

Active Publication Date: 2021-05-28
CNOOC TIANJIN CHEM RES & DESIGN INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the presence of polyacrylamide polymer oil recovery additives, the oil-water emulsification in the polymer-containing sewage is serious, and the coalescence ability between the emulsified oil droplets is reduced. At the same time, a large amount of mud and sand are mixed, which greatly increases the difficulty of demulsification of the polymer-containing production fluid.

Method used

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  • Polymer-containing produced liquid demulsifier and preparation method thereof
  • Polymer-containing produced liquid demulsifier and preparation method thereof
  • Polymer-containing produced liquid demulsifier and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Add 30g of pentaerythritol as the initiator in the closed high-pressure reactor, add 0.6g of sodium hydroxide, and keep the reaction temperature at 120°C under stirring after the reactor is repeatedly replaced with nitrogen. Keeping the reaction time for 1 h, after natural cooling, a PO / EO / PO tri-block polyether polyol was obtained, which was used as a blank control example as a demulsifier.

Embodiment 2～4

[0023] According to the ratio listed in Table 1, the polyether polyol obtained in Example 1, dendritic branched polymer, polymer degradation agent and solvent were compounded to obtain the polymer-containing production fluid rapid demulsifier of the present invention.

[0024] Table 1

[0025]

[0026] Application effect:

[0027] The polymer-containing production fluid demulsifiers prepared in Examples 1-4 are used for the demulsification of the polymer-containing production fluid, and the water-in-oil emulsion can be destroyed by using the demulsifier to realize oil-water separation.

[0028] Source of crude oil production fluid: production fluid from a polymer-bearing oilfield in Bohai Sea, crude oil polymer content 30-100mg / L, viscosity 591.8-2343mPa·s, density 950.8-971.5kg / m 3 (20°C), with a comprehensive water content of 75%, tested its application effect, and the results are shown in Table 2.

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Abstract

The invention relates to a polymer-containing produced liquid demulsifier and a preparation method thereof. The polymer-containing produced liquid rapid demulsifier consists of polyether polyol, a dendritic branched polymer, a polymer degradation agent and a solvent, wherein the mass ratio of the polyether polyol to the dendritic branched polymer to the polymer degradation agent to the solvent is (15-30):(5-20):(1-5):(45-79). The polymer-containing produced liquid demulsifier can quickly degrade polymers in crude oil, has the advantages of easiness in diffusion, high dehydration speed, clear dehydrated water quality and the like, and has a good polymer-containing produced liquid treatment effect.

Description

technical field [0001] The invention belongs to the technical field of petroleum industry, and in particular relates to a polymer-containing production fluid demulsifier and a preparation method thereof. Background technique [0002] In order to improve the recovery efficiency, my country's Bohai Oilfield began to gradually carry out experiments on enhanced oil recovery technologies such as polymer flooding in 2003, and achieved good oil displacement effects; The number of wells gathered has exceeded 44. However, with the increase in the number of wells benefiting from polymer injection in recent years, the concentration of polymer in the produced fluid tends to increase gradually. Taking a polymer injection oilfield in the Bohai Sea as an example, among the 105 benefited wells, 22 wells have produced polymers, 25 wells have a tendency to produce polymers, and 58 wells have not yet produced polymers. The central processing platform produces The concentration of poly in the ...

Claims

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Application Information

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IPC IPC(8): C10G33/04C08G65/28C08G83/00
CPCC10G33/04C08G65/2609C08G83/003
Inventor 魏清李志元王素芳章甦程景生姚光源
Owner CNOOC TIANJIN CHEM RES & DESIGN INST
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