Method for controlling corrosion of acidic produced liquid of oil field

A produced fluid and acid technology, applied in chemical instruments and methods, mining wastewater treatment, water/sludge/sewage treatment, etc., can solve the problems of corrosion of oil and gas gathering and transportation equipment or pipelines, taking care of one and the other, and extending the maintenance-free period of oil wells , reduce the dosage, and solve the effect of corrosion problems

Inactive Publication Date: 2019-02-15
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the water quality modification method is mainly carried out for the external water transfer after the produced fluid enters the oil-water separation of the combined station, which leads to serious corrosion of the oil pumping pipeline, the oil and gas gathering and transportation equipment or pipeline from the ground to the combined station
[0004] The existing oil well protection methods are mainly based on isolation and protection of the base material, and the corrosion characteristics of the produced fluid have not changed fundamentally, which often leads to the problem of focusing on one thing and losing another

Method used

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  • Method for controlling corrosion of acidic produced liquid of oil field
  • Method for controlling corrosion of acidic produced liquid of oil field
  • Method for controlling corrosion of acidic produced liquid of oil field

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] An oil well A in Gudao Oil Production Plant of Shengli Oilfield 12 , the daily liquid production is 134.8t, the daily oil production is 2.8t, and the water cut is 97.9%. The oil well is severely corroded, and the lower part of the working cylinder and the screen pipe are corroded and broken off, resulting in frequent operations. The maintenance-free period before the test is 176 days. Implement the concrete steps of the present invention in this oil well as follows:

[0033] (1) Water quality analysis of produced fluid

[0034] The indicators of water quality analysis include: temperature, pH, salinity, hydrogen sulfide content and aggressive carbon dioxide content of produced fluid. Well A 12 The analysis results of the produced fluid are shown in Table 1.

[0035] Table 1 Well A 12 Produced water quality analysis results

[0036]

[0037] (2) Screening of produced fluid

[0038] Well A 12 The temperature of the produced fluid is ≤85°C, pH<7.0, salinity ≤200,...

Embodiment 2

[0063] An oil well B in Gudao Oil Production Plant of Shengli Oilfield 2 , the daily liquid production is 139t, the daily oil production is 4t, and the water content is 97.1%. The oil well is severely corroded, and the joints at the lower part of the pump barrel are corroded and fractured, resulting in frequent operations. The maintenance-free period before the test is 133d. Implement the concrete steps of the present invention in this oil well as follows:

[0064] (1) Water quality analysis of produced fluid

[0065] The indicators of water quality analysis include: the temperature, pH, salinity, hydrogen sulfide content and aggressive carbon dioxide content of the produced fluid, oil well B 2 The test results of the produced fluid are shown in Table 5.

[0066] Table 5 Well B 2 Produced water quality test results

[0067]

[0068] (2) Screening of produced fluid

[0069] oil well B 2 The temperature of the produced fluid is ≤85°C, pH<7.0, salinity ≤200,000mg / L, hydr...

Embodiment 3

[0093] An oil well C in Gudong Oil Production Plant of Shengli Oilfield 5 , the daily liquid production is 102t, the daily oil production is 2.3t, and the water content is 97.7%. Many oil pipes are corroded and perforated, resulting in frequent operations. The maintenance-free period before the test is 179d. Implement the concrete steps of the present invention in this oil well as follows:

[0094] (2) Water quality analysis of produced fluid

[0095] The indicators of water quality analysis include: temperature, pH, salinity, hydrogen sulfide content and aggressive carbon dioxide content of produced fluid. oil well C 5 The analysis results of the produced fluid are shown in Table 9.

[0096] Table 9 Well C 5 Produced water quality test results

[0097]

[0098] (2) Screening of produced fluid

[0099] oil well C 5 The outlet temperature is ≤85°C, pH<7.0, salinity ≤200000mg / L, hydrogen sulfide content≤60mg / L, and corrosive carbon dioxide content≤100mg / L. All indexes...

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Abstract

The invention discloses a method for controlling the corrosion of an acidic produced liquid of an oil field and belongs to the technical field of oil field sludge treatment and corrosion control. Themethod specifically comprises the following steps: analyzing the water quality of the produced liquid; screening the produced liquid; screening desulfurization and corrosion inhibition functional bacteria; determining a modifier; determining a dirt dispersion agent; determining an on-site implementation process; and carrying out on-site implementation and effect evaluation. By combining a biological desulfurization process with a modified process, the corrosion rate of the produced liquid is reduced effectively and the maintenance free period of the oil field is prolonged effectively. The corrosion rate of the produced liquid reaches over 80%, and the maintenance free period of the oil field is prolonged by over 50%. Moreover, the method has the characteristics of being simple in implementation process, high in pertinence and operability and good in on-site test effect, so that the method can be widely applied to treatment of the acidic produced liquid of the oil field.

Description

technical field [0001] The invention belongs to the technical field of oilfield sewage treatment and corrosion control, and in particular relates to a method for controlling corrosion of oilfield acidic production fluid. Background technique [0002] In the development of oil and gas wells, from underground pipe strings to surface pipelines and storage tanks and various process equipment will be corroded, which seriously affects the development effect and causes huge economic losses. In the pipeline accidents in my country's oilfields, the damage caused by corrosion accounts for about 30%. The pipelines in eastern my country's oilfields are corroded and perforated 20,000 times per year, and the replacement pipeline is 400km per year. In Shengli Oilfield, the annual direct economic loss of pipeline materials due to corrosion is 300 million yuan, and the indirect economic loss is about 1 billion yuan due to the replacement of pipe strings, frequent pipeline operations and prod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/34C02F103/10
CPCC02F3/341C02F2103/10
Inventor 徐闯张守献徐鹏曹嫣镔朱信刚潘永强袁长忠冯逸茹张吉星宋永亭林军章
Owner CHINA PETROLEUM & CHEM CORP
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