Oil well acidification produced liquid dehydration method

A technology for oil well acidification and production fluid, which is applied in the direction of chemical dehydration/demulsification, immiscible liquid separation, etc. It can solve the problems of increasing the difficulty of production fluid demulsification, achieve good oil-water separation effect, wide source, The effect of good dehydration effect

Active Publication Date: 2016-06-01
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For heavy oil, the content of colloid and asphaltene is relatively high. After the stability of the colloidal dispersion system of crude oil is destroyed, the colloid and asphaltene will precipitate from the crude oil and react with hydrogen ions to easily form acidified sludge, further increasing production capacity. Difficulty of demulsification

Method used

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  • Oil well acidification produced liquid dehydration method
  • Oil well acidification produced liquid dehydration method
  • Oil well acidification produced liquid dehydration method

Examples

Experimental program
Comparison scheme
Effect test

preparation Embodiment 1

[0060] (1) According to the composition of Table 1, the polyoxyethylene-polyoxypropylene block copolymer type nonionic surfactant (purchased from Binhua Group, the brand is AE10071), line Alkylphenol polyoxyethylene ether type nonionic surfactant (purchased from Binhua Group, brand name NP15) and water were mixed evenly to obtain the dehydrating agent according to the present invention, denoted as D1.

preparation Embodiment 2

[0064] According to the composition of Table 1, the polyoxyethylene-polyoxypropylene block copolymer type nonionic surfactant (purchased from Binhua Group, brand TA1031) with phenolamine resin as the initiator, polyether grafted poly Dimethylsiloxane type nonionic surfactant (purchased from Yinuoen Chemical Co., Ltd., brand YNE5211) and solvent (a mixture of ethanol and water, wherein the weight ratio of ethanol and water is 1:2) mixed Uniformly, thus obtain the dehydrating agent according to the present invention, denoted as D2.

preparation Embodiment 3

[0074] The same method as Preparation Example 2 was used to prepare the dehydrating agent, the difference was that the polyether grafted polydimethylsiloxane type nonionic surfactant used an equivalent amount of alkylphenol polyoxyethylene ether (purchased from Binhua Group, trade mark is NP15) instead, thereby obtains dehydrating agent, is recorded as D3.

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Abstract

The invention discloses an oil well acidification produced liquid dehydration method. The method comprises the following steps: mixing an oil well acidification produced liquid with water, and carrying out oil-water separation, mixing the pretreated acidification produced liquid with a neutralizer and a dehydrator, and carrying out oil-water separation on the above obtained mixture, wherein the dehydrator contains a first nonionic surfactant and a second nonionic surfactant, the first nonionic surfactant is a branched polyether nonionic surfactant, the second nonionic surfactant is selected from a linear alkylphenol polyoxyethylene nonionic surfactant and a polyether grafted polysiloxane nonionic surfactant, and the neutralizer is an organic amine and/or a quaternary ammonium base. The method realizes a good oil-water separation effect when used to dehydrate the oil well acidification produced liquid, and the water content of treated crude oil is low. The dehydrator used in the method has the advantages of simple composition, wide sources of all components, and concise operation flow.

Description

technical field [0001] The invention relates to a method for dehydrating oil well acidizing production fluid. Background technique [0002] After oil well acidizing construction, carbonate oil wells undergoing reservoir transformation are fully mixed with mud, acidified fracturing fluid residue, auxiliary agent reactants, water, etc. in the initial flowback through high-speed flowback, resulting in serious emulsification. , Emulsified crude oil that is not easy to handle is called acidified oil. There are many factors that affect the difficulty of demulsification of acidified oil, especially acidified heavy oil production fluid, such as residual acid in acidified oil, residual additives, and a large number of clay particles. [0003] H in residual acid + It will activate the naphthenic acid in the heavy oil and react with the basic nitrogen compounds in the crude oil to form a substance with a certain interface activity. In addition, it will also lead to a decrease in the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G33/04B01D17/05
Inventor 沈明欢王振宇于丽秦冰李本高王征
Owner CHINA PETROLEUM & CHEM CORP
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