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Method for inhibiting union station system sump oil recovery resulting in dehydration current increase

A technology of combining station and slop oil, which is applied in separation methods, chemical instruments and methods, precipitation and separation, etc., to achieve the effect of reducing the water content of slop oil, improving the quality of exported oil, and high safety

Active Publication Date: 2014-01-15
大庆亿莱检验检测技术服务有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004]Aiming at the deficiencies in the prior art, the purpose of the present invention is to solve the problem that the combined station system in the background technology recycles dirty oil, which causes the dehydration current to increase or even exceed the electric field problem

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Take the waste oil from the oil post settling tank of an oil field joint station, analyze the total iron content of 71.6mg / kg, the sulfide content of 51.4 mg / kg, the water content of 25%, and the test conductivity of 3900μS / cm; at 40℃, add 500mg / L of chemical agent A was treated for 2 hours, the temperature was raised to 50°C, and 200mg / L of chemical agent B was added for 5 hours. After treatment, the water content of the waste oil was 0.6%, and the conductivity was 0.17μS / cm, lower than the requirements of the electric dehydrator. The index is 0.43μS / cm;

[0029] According to the mass fraction, the above-mentioned medicament A includes the following components:

[0030] Organic Citric Acid 20%

[0031] Chelating agent 20%

[0032] The solvent is the balance of water.

[0033] The chelating agent is a compound of polyamino polyether methylene phosphonic acid PAPEMP and polyepoxysuccinate sodium PESA, and the compounding ratio is 6:4.

[0034] According t...

Embodiment 2

[0038] Take the sewage oil from the oil post settling tank of an oil field joint station, analyze the total iron content of 34.5 mg / kg, the sulfide content of 27.3 mg / kg, the water content of 18%, and the test conductivity of 1700 μS / cm; at 40 °C, add 200mg / L of chemical agent A was treated for 2 hours, the temperature was raised to 50°C, and 150mg / L of chemical agent B was added to treat for 5 hours. After treatment, the water content of the waste oil was 0.4%, and the electrical conductivity was 0.23μS / cm, which was lower than the requirement of the electric dehydrator. The index is 0.43μS / cm;

[0039] According to the mass fraction, the above-mentioned medicament A includes the following components:

[0040] Organic Citric Acid 10%

[0041] Chelating agent 20%

[0042] The solvent is the balance of water.

[0043] The chelating agent is a compound of polyamino polyether methylene phosphonic acid PAPEMP and polyepoxysuccinate sodium PESA, and the compounding r...

Embodiment 3

[0048] The oil thickness of the settling tank of an oilfield joint station is 2.4m, and the treatment capacity of the sewage lift pump is 25m 3 / h, the inlet liquid temperature of the free water remover is 40°C, the treatment temperature of the electric dehydrator is 55°C, the impurity content of the waste oil is 3.2%, and the water content is 28%. The voltage is 0-70v, the current is 80-110A, and the moisture content of the external oil reaches 1.0-1.6% when the electric field is crossed; this method is used to add 500mg / L chemical agent A to the inlet of the sewage oil lifting pump, and to the inlet of the dehydration heating furnace. After adding 200mg / L chemical agent B for 10 hours, the dehydration voltage gradually increased. Within 2 days, the voltage rose from 120V to 348V, and the dehydration current dropped from 100A to 20A. The moisture content of the exported oil reached the standard of 0.3%. Oil thickness dropped from 2.4m to 0.20m.

[0049] According to the mass...

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PUM

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Abstract

The invention discloses a method for inhibiting union station system sump oil recovery resulting in dehydration current increase. Sump oil contains a large amount of mechanical impurities, under the condition that the temperature is 40-70 DEG C, and the sedimentation time is 5-10 h, a medicament A with the concentration of 100-1000mg / l and a medicament B with the concentration of 100-300mg / l are added into the sump oil; by adding two chemical agents, the conductivity of the sump oil containing mechanical impurities can be reduced remarkably, the problem that dehydration current is increased during sump oil recovery is inhibited, and the dehydration current is controlled to be less than 50 A.

Description

technical field [0001] The invention relates to a method for treating waste oil recovered by an oil field combined station system, in particular to a method for preventing the dehydration current of an electric dehydrator from increasing or crossing an electric field caused by the recovered waste oil from a combined station oil and water post settling tank. Background technique : [0002] At present, the middle layer of the electric dehydrator, the upper part of the sewage settling tank, the upper part of the emergency tank and the upper layer of the recovery pool in a considerable part of the combined station system of various oil fields contain a large amount of dirty oil with black solid particles. There are two main reasons for the formation of dirty oil: on the one hand, the system The excessive reproduction of internal sulfate-reducing bacteria produces hydrogen sulfide, which corrodes the wellbore and surface equipment to form ferrous sulfide; on the other hand, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D21/01
Inventor 赵法军刘永建
Owner 大庆亿莱检验检测技术服务有限公司