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A method for treating sulfate-reducing bacteria corrosion in oil wells below 50m in subsidence

A technology of sulfate and submergence, which is applied in the direction of earthwork drilling, wellbore/well parts, etc., can solve the problems of low sterilization rate and drug resistance of fungicides, extend the inspection period of pumps, solve the problem of corrosion of oil production equipment, The effect of improving the sterilization efficiency

Active Publication Date: 2018-06-01
PETROCHINA CO LTD
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Problems solved by technology

[0004] Therefore, the main problem existing in the prior art is that sulfate-reducing bacteria produce drug resistance to bactericides, and the bactericidal rate is low

Method used

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  • A method for treating sulfate-reducing bacteria corrosion in oil wells below 50m in subsidence
  • A method for treating sulfate-reducing bacteria corrosion in oil wells below 50m in subsidence
  • A method for treating sulfate-reducing bacteria corrosion in oil wells below 50m in subsidence

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Embodiment 1

[0034] This example provides a method for treating the corrosion of sulfate-reducing bacteria in Well Jin X-7 with five kinds of fungicides.

[0035] Working conditions of Jin X-7 well: pump depth is 2100 meters, moving liquid surface is 2080 meters, submergence is 20 meters, daily fluid production is 3.2 cubic meters per day, water content is 90%, and the number of sulfate-reducing bacteria in free water of produced fluid is 10 4 cell / ml (number of cells per milliliter of free water).

[0036] Step (1), according to the SY / T5890-93 bactericide performance evaluation method, screen out 5 kinds of bactericides with a bactericidal rate of more than 95% for sulfate-reducing bacteria in the production fluid of Jin X-7 well, which are respectively trichloroiso Cyanuric acid, bromochlorodimethylhydantoin, dodecyl dimethyl benzyl ammonium chloride, dodecyl dimethyl benzyl ammonium bromide, metronidazole.

[0037] Step (2), each of the bactericides with a bactericidal rate of more th...

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Abstract

The invention discloses a method for controlling sulfate reducing bacteria corrosion of an oil well with the submergence depth being lower than 50m, and belongs to the technical field of petroleum industry oil production engineering. The method is characterized in that n kinds of bactericides with the bactericide rate reaching a value being higher than 95 percent on sulfate reducing bacteria in oil well produced liquid are screened out according to SY / T5890-93, wherein the value of the n is 4 or 5 or 6; the n kinds of bactericides are combined pairwise to obtain n(n-1) / 2 kinds of bactericide combinations; firstly, the n kinds of bactericides are all put into the oil well; then, from the second day of the addition of all bactericides, one group of the n(n-1) / 2 kinds of bactericide combinations is added into the oil well every day until all of the n(n-1) / 2 kinds of bactericide combinations are added once in a non-repeatedly way; and the bactericide combinations are cyclically added according to the adding sequence of the n(n-1) / 2 kinds of bactericide combinations. The control method provided by the invention has the advantages that the sulfate reducing bacteria are prevented from generating drug resistance; the bactericide rate reaches the value being higher than 95 percent; and the oil well pump inspection period is prolonged by more than 5 times.

Description

technical field [0001] The invention relates to a method for controlling the corrosion of sulfate-reducing bacteria in oil wells with a submergence degree below 50 m, and belongs to the technical field of oil recovery engineering in the petroleum industry. Background technique [0002] At present, Ji Oilfield has entered a period of high water cut, and some oil wells contain a large number of sulfate-reducing bacteria (SRB). The existence of sulfate-reducing bacteria will corrode tubing, sucker rods and other equipment, affecting the normal production of the oilfield. At present, oilfield technicians use a method of adding a single bactericide or biological inhibitor to kill sulfate-reducing bacteria in the oil well for treatment. For example, dodecyl dimethyl benzyl ammonium chloride (1227 fungicide) is added to the oil well. However, this method can only achieve a better bactericidal effect in the initial stage of dosing. As time goes by, sulfate-reducing bacteria will d...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B41/02C09K8/54
Inventor 付亚荣李运娥翟胜强马永忠刘春平李小永姜一超姚庆童李冬青付丽霞谢荣婕罗金洋宋贾利李春燕张延彬
Owner PETROCHINA CO LTD
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