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Demulsification and dehydration method for oilfield produced fluid

A technology for produced fluids and oil fields, applied in chemical dehydration/demulsification, etc., to achieve high demulsification performance, reduced production energy consumption, and low dehydration temperature

Inactive Publication Date: 2017-11-17
胜利油田华滨实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art, and provide a method for demulsification and dehydration of oilfield production fluid. The method for demulsification and dehydration of oilfield production fluid in the present invention improves the existing process and effectively solves the problem of dehydration temperature of crude oil. High problems, reduced production energy consumption, improved production and operation quality

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1 The demulsification and dehydration method of oilfield production fluid comprises the following steps:

[0025] (1) To the oilfield production fluid entering the pipeline (the volume of oilfield production fluid is 5200m 3 ) into the pre-dehydrating agent, and then enter the pre-separation cylinder from the inlet of the three-phase separator. The pressure of the three-phase separator is 0.2MPa, and most of the gas is separated in the pre-separation cylinder. The exhaust hole on the top is discharged; the pre-dehydrating agent is made of polyacrylamide, polyethylene polyamine and diethylene glycol in a mass ratio of 3:2:1;

[0026] (2) Step (1) The pre-degassed oil-water mixture enters the primary settling tank and the secondary settling tank sequentially through the catheter. The settling time of the primary settling tank is 52 minutes, and the settling time of the secondary settling tank is 45 minutes. A dosing station is respectively set up in front of t...

Embodiment 2

[0028] Embodiment 2 The demulsification and dehydration method of oilfield production fluid comprises the following steps:

[0029] (1) To the oilfield production fluid entering the pipeline (the volume of oilfield production fluid is 5200m 3 ) into the pre-dehydrating agent, and then enter the pre-separation cylinder from the inlet of the three-phase separator. The pressure of the three-phase separator is 0.3MPa, and most of the gas is separated in the pre-separation cylinder. The exhaust hole on the top is discharged; the pre-dehydrating agent is made of polyacrylamide, polyethylene polyamine and diethylene glycol in a mass ratio of 3:2:1;

[0030] (2) Step (1) The pre-degassed oil-water mixture enters the primary settling tank and the secondary settling tank sequentially through the catheter. The settling time of the primary settling tank is 66 minutes, and the settling time of the secondary settling tank is 55 minutes. A dosing station is respectively set up in front of t...

Embodiment 3

[0032] Embodiment 3 The demulsification and dehydration method of oilfield production fluid comprises the following steps:

[0033] (1) To the oilfield production fluid entering the pipeline (the volume of oilfield production fluid is 5200m 3 ) into the pre-dehydrating agent, and then enter the pre-separation cylinder from the inlet of the three-phase separator. The exhaust hole on the top is discharged; the pre-dehydrating agent is made of polyacrylamide, polyethylene polyamine and diethylene glycol in a mass ratio of 3:2:1;

[0034] (2) Step (1) The pre-degassed oil-water mixture enters the primary settling tank and the secondary settling tank sequentially through the catheter. The settling time of the primary settling tank is 60 minutes, and the settling time of the secondary settling tank is 50 minutes. A dosing station is respectively set up in front of the primary settling tank and the secondary settling tank, and a demulsifier is added to the oil-water mixture through ...

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PUM

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Abstract

The invention discloses a demulsification and dehydration method for oilfield produced fluid. Firstly, a pre-dehydrant is added into the oilfield produced fluid entering a pipeline, then the oilfield produced fluid enters a pre-separation cylinder from the inlet of a three-phase separator, most gas is separated out in the pre-separation cylinder, then the oilfield produced fluid enters primary and secondary settling tanks in sequence via a catheter, a dosing station is arranged in front of the primary settling tank, and and a dosing station is in front of the secondary settling tank; a demulsifier is added into the oil-water mixed solution via the dosing stations, crude oil coming out after dehydration in the secondary settling tank is heated to 83 DEG C via a vapor heat exchanger, the oilfield produced fluid enters a third settling tank for dehydration, and the water content of the dehydrated oilfield produced fluid is less than 2% and completely meets the using requirement. The demulsification and dehydration method for oilfield produced fluid effectively solves the problem of high crude oil dehydration temperature, reduces the production energy consumption, and improves the production quality.

Description

technical field [0001] The invention relates to a method for demulsification and dehydration of oilfield production fluid. Background technique [0002] The No. 2 Combined Station of Chunfeng Oilfield is mainly responsible for the crude oil processing and transportation tasks in the third management area of ​​Xinchun Oil Production Plant, with an annual processing liquid volume of 3 million m 3 . In the past two years, with the increase in the proportion of incoming heavy oil, the content of colloids and asphaltene in incoming heavy oil is relatively high, and the degree of water emulsification is high. Usually, in order to ensure that the water content of the exported crude oil meets the standard, the demulsification and dehydration temperature of the crude oil needs to reach about 93°C. [0003] Demulsification and dehydration of crude oil is an important link in the process of crude oil extraction, transportation and refining. In the process of crude oil dehydration, wi...

Claims

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Application Information

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IPC IPC(8): C10G33/04
CPCC10G33/04
Inventor 刘静刘忠东马优良郭振训田新房毛方义
Owner 胜利油田华滨实业有限公司